阅读说明：本技术 内燃机用点火系统 (Ignition system for internal combustion engines ) 是由 大野贵士 于 2018-04-10 设计创作，主要内容包括：一种内燃机用点火系统,在初级线圈(12)中设置有中间抽头(12A),具备：第3开关元件(14),进行从电压施加部(17)流向中间抽头的初级电流的切断和导通；第1开关元件(15),连接于第1绕组(12B)侧的一端侧；第2开关元件(16),连接于第2绕组(12C)侧的另一端侧；点火控制电路(30),通过分别控制上述开关元件的动作,来进行放电产生控制和放电维持控制,在该放电产生控制中使火花塞产生火花放电,在该放电维持控制中进行流向第2绕组的初级电流的切断和导通来维持火花塞(20)中产生的火花放电；以及电流回流路径(L1、L4、L7),供从第2绕组流向第2开关元件的电流回流。(A kind of ignition system for internal combustion engines, centre tap (12A) is provided in primary coil (12), have: the 3rd switch element (14) carries out cutting and conducting that tapped primary current is flowed to from voltage application portion (17)；1st switch element (15) is connected to the one end of the 1st side winding (12B)；2nd switch element (16) is connected to the another side of the 2nd side winding (12C)；Ignition control circuit (30), by the movement for controlling above-mentioned switch element respectively, to carry out, electric discharge generates control and electric discharge maintains control, generating in control in the electric discharge makes spark plug generate spark discharge, maintains flow to cutting and the conducting of the primary current of the 2nd winding in control in the electric discharge to maintain the spark discharge generated in spark plug (20)；And current reflux path (L1, L4, L7), for flowing to the current reflux of the 2nd switch element from the 2nd winding.)

1. a kind of ignition system for internal combustion engines, which is characterized in that have:

Spark plug (20) generates the spark discharge for the indoor combustion mixture igniting of burning to internal combustion engine (60)；

Ignition coil (11) has primary coil (12) and secondary coil (13), by the secondary coil to the spark plug Apply voltage；

Defined voltage is applied to the primary coil by voltage application portion (17)；

3rd switch element (14) is provided with centre tap (12A) in the midway for the winding for forming the primary coil, carry out from The voltage application portion flows to being switched on and off for the tapped primary current；

1st switch element (15), be connected in the winding to form the primary coil from the centre tap to one end around Group is between one end and ground side of the 1st side winding (12B)；

2nd switch element (16), be connected in the winding to form the primary coil from the centre tap to the other end Winding is i.e. between one end and ground side of the 2nd side winding (12C)；

Ignition control circuit (30), by controlling the open and-shut mode of the 1st switch element, the 2nd switch element respectively The open and-shut mode of open and-shut mode and the 3rd switch element, to carry out, electric discharge generates control and electric discharge maintains control, the electric discharge It generates control and refers to flow to the primary current of the 1st winding and be switched on and off generate the spark plug The control of the spark discharge, the electric discharge maintain to control leading for the primary current for referring to flow to the 2nd winding Lead to and cut off the control to maintain the spark discharge generated in the spark plug；And

Current reflux path (L1), for flowing to the current reflux of the 2nd switch element from the 2nd winding.

2. ignition system for internal combustion engines according to claim 1, which is characterized in that

The current reflux path (L1) has the 1st diode (18), and the cathode side of the 1st diode is connected to the centre The anode-side of tap, the 1st diode is connected to ground side.

3. ignition system for internal combustion engines according to claim 1 or 2, which is characterized in that

2nd switch element on the basis of being in an off state by the 1st switch member by the ignition control circuit Part and the 3rd switch element control be closed state, the 1st switch element is in an off state later, thus into Row flows to being switched on and off for the primary current of the 1st winding, is in an off state by the 1st switch element On the basis of the 2nd switch element and the 3rd switch element are controlled as closed state, later by the 3rd switch member Part is in an off state, and thus carries out the conducting and reflux that flow to the primary current of the 2nd winding.

4. ignition system for internal combustion engines according to claim 1 or 2, which is characterized in that

2nd switch element on the basis of being in an off state by the 1st switch member by the ignition control circuit Part and the 3rd switch element control be closed state, the 1st switch element is in an off state later, thus into Row flows to being switched on and off for the primary current of the 1st winding, is in an off state by the 1st switch element On the basis of the 2nd switch element and the 3rd switch element are controlled as closed state, later by the 2nd switch member Part is in an off state, and thus carries out being switched on and off for the primary current for flowing to the 2nd winding.

5. a kind of ignition system for internal combustion engines, which is characterized in that have:

Spark plug (20) generates the spark discharge for the indoor combustion mixture igniting of burning to internal combustion engine (60)；

Ignition coil (11) has primary coil (12) and secondary coil (13), by the secondary coil to the spark plug Apply voltage；

Voltage application portion (17) is provided with centre tap (12A) in the midway for the winding for forming the primary coil, will be defined Voltage is applied to the centre tap；

1st switch element (15), be connected in the winding to form the primary coil from the centre tap to one end around Group is between one end and ground side of the 1st side winding (12B)；

2nd switch element (16), be connected in the winding to form the primary coil from the centre tap to the other end Winding is i.e. between one end and ground side of the 2nd side winding (12C)；

Ignition control circuit (30), by the open and-shut mode and the 2nd switch element that control the 1st switch element respectively Open and-shut mode generates control and electric discharge maintenance control to carry out electric discharge, which generates control and refer to carrying out flowing to the described 1st The control for being switched on and off that the spark plug is made to generate the spark discharge of the primary current of winding, the electric discharge maintain control Refer to flow to being switched on and off to maintain the institute generated in the spark plug for the primary current of the 2nd winding State the control of spark discharge；And

Current reflux path (L4) has cut off the electricity for flowing through the 2nd winding by the on-off action of the 2nd switch element For flowing through the current reflux of the 2nd winding when stream.

6. ignition system for internal combustion engines according to claim 5, which is characterized in that

The current reflux path has the 2nd diode (41), and the cathode side of the 2nd diode is connected to the voltage and applies Current path (L6) between portion and the centre tap, the anode-side of the 2nd diode are connected to the 2nd winding and institute State the current path (L5) between the 2nd switch element.

7. ignition system for internal combustion engines according to claim 5 or 6, which is characterized in that

Control is generated as the electric discharge, the 2nd switch element is being in an off state by the ignition control circuit On the basis of the 1st switch element is controlled as closed state, the 1st switch element is in an off state later, by This flow to being switched on and off for the primary current of the 1st winding, maintains to control as the electric discharge, the ignition control Circuit controls the 2nd switch element for closed state on the basis of being in an off state the 1st switch element, The 2nd switch element is in an off state later, thus carries out leading for the primary current for flowing to the 2nd winding Logical and reflux.

8. ignition system for internal combustion engines according to any one of claims 1 to 7, which is characterized in that

Has the 3rd diode (19), the cathode side of the 3rd diode (19) is connected to the 2nd switch element, the 3rd two pole The anode-side of pipe (19) is connected to the end with centre tap side opposite side.

9. ignition system for internal combustion engines according to any one of claims 1 to 7, which is characterized in that

Has the 3rd diode (19), the cathode side of the 3rd diode (19) is connected to the centre tap, the 3rd diode (19) anode-side is connected to the voltage application portion.

10. a kind of ignition system for internal combustion engines, which is characterized in that have:

Spark plug (20) generates the spark discharge for the indoor combustion mixture igniting of burning to internal combustion engine (60)；

Ignition coil (11) has primary coil (12) and secondary coil (13), by the secondary coil to the spark plug Apply voltage；

Voltage application portion (17) is provided with centre tap (12A) in the midway for the winding for forming the primary coil, will be defined Voltage is applied to the centre tap；

1st switch element (15), be connected in the winding to form the primary coil from the centre tap to one end around Group is between one end and ground side of the 1st side winding (12B)；

3rd switch element (14) is connected to the centre tap and winding i.e. the 2nd winding from the centre tap to the other end Between；

Ignition control circuit (30), by the open and-shut mode and the 3rd switch element that control the 1st switch element respectively Open and-shut mode generates control and electric discharge maintenance control to carry out electric discharge, which generates control and refer to producing the spark plug The control of the raw spark discharge, the electric discharge maintain control to refer to the spark discharge for maintaining to generate in the spark plug Control；And

Current reflux path (L7), for flowing to the current reflux of ground side from the 2nd winding.

11. ignition system for internal combustion engines according to claim 10, which is characterized in that

The current reflux path has the 4th diode (42), and the cathode side of the 4th diode is connected to the 3rd switch The anode-side of current path (L8) between element and the 2nd winding, the 4th diode is connected to ground side.

12. ignition system for internal combustion engines described in 0 or 11 according to claim 1, which is characterized in that

Has the 3rd diode (19), the cathode side of the 3rd diode (19) is connected to ground side, the sun of the 3rd diode (19) Pole side is connected to the end with centre tap side opposite side of the 2nd winding.

13. ignition system for internal combustion engines described in 0 or 11 according to claim 1, which is characterized in that

Has the 3rd diode (19), the cathode side of the 3rd diode (19) is connected to the centre tap of the 2nd winding The anode-side of the end of side, the 3rd diode (19) is connected to the 3rd switch element.

14. ignition system for internal combustion engines described in any one of 0 to 13 according to claim 1, which is characterized in that

Control is generated as the electric discharge, the 3rd switch element is being in an off state by the ignition control circuit On the basis of the 1st switch element is controlled as closed state, the 1st switch element is in an off state later, by This flow to being switched on and off for the primary current of the 1st winding, maintains to control as the electric discharge, the ignition control Circuit controls the 3rd switch element for closed state on the basis of being in an off state the 1st switch element, The 3rd switch element is in an off state later, thus carries out leading for the primary current for flowing to the 2nd winding Logical and reflux.

15. ignition system for internal combustion engines described in any one of 0 to 13 according to claim 1, which is characterized in that

Control is generated as the electric discharge, the ignition control circuit is by the 1st switch element and the 3rd switch element control It is made as closed state, the 1st switch element and the 3rd switch element are in an off state later, thus flowed It is switched on and off to the primary current of the 1st winding and the 2nd winding, maintains to control as the electric discharge, the point 3rd switch element control is to close on the basis of being in an off state the 1st switch element by fiery control circuit 3rd switch element, is in an off state by conjunction state later, thus carries out the primary for flowing to the 2nd winding The conducting and reflux of electric current.

16. according to claim 1 to ignition system for internal combustion engines described in any one of 15, which is characterized in that

The number of turns of 1st winding is more than the number of turns of the 2nd winding.

17. according to claim 1 to ignition system for internal combustion engines described in any one of 16, which is characterized in that

It divided by the obtained value of the number of turns of the 2nd winding is turn ratio by the number of turns of the secondary coil, greater than will be in order to tie up The required voltage of the spark discharge for generating control by the electric discharge generate the spark plug is held to discharge maintenance Voltage is divided by the obtained value of the voltage applied by the voltage application portion i.e. voltage ratio.

18. the ignition system for internal combustion engines according to any one of claim 3,14,15, which is characterized in that

Have secondary current test section (L2,30), which detects the secondary for flowing through the spark plug Electric current,

The ignition control circuit detects in a period of implementing the electric discharge maintenance control by the secondary current test section In the case that the absolute value of the secondary current out is less than the 1st threshold value, the 3rd switch element is controlled as closed state, It is bigger than the 1st threshold value greater than being set in the absolute value of the secondary current detected by the secondary current test section The 2nd threshold value in the case where, the 3rd switch element is in an off state.

19. the ignition system for internal combustion engines according to claim 4 or 7, which is characterized in that

Have secondary current test section (L2,30), which detects the secondary for flowing through the spark plug Electric current,

The ignition control circuit detects in a period of implementing the electric discharge maintenance control by the secondary current test section In the case that the absolute value of the secondary current out is less than the 1st threshold value, the 2nd switch element is controlled as closed state, It is bigger than the 1st threshold value greater than being set in the absolute value of the secondary current detected by the secondary current test section The 2nd threshold value in the case where, the 2nd switch element is in an off state.

20. ignition system for internal combustion engines according to any one of claims 1 to 4, which is characterized in that

1st switch element, the 2nd switch element, the 3rd switch element, the ignition control circuit and described Current reflux path is accommodated in the shell (50) for being accommodated with the ignition coil.

21. the ignition system for internal combustion engines according to any one of claim 5 to 7, which is characterized in that

1st switch element, the 2nd switch element, the ignition control circuit and the current reflux path are received It is dissolved in the shell (50) for being accommodated with the ignition coil.

22. ignition system for internal combustion engines described in any one of 0 to 15 according to claim 1, which is characterized in that

1st switch element, the 3rd switch element, the ignition control circuit and the current reflux path are received It is dissolved in the shell (50) for being accommodated with the ignition coil.

23. according to claim 1 to ignition system for internal combustion engines described in any one of 22, which is characterized in that

5th diode (15D) inverse parallel is connected to the 1st switch element.

24. according to claim 1 to ignition system for internal combustion engines described in any one of 23, which is characterized in that

The internal combustion engine is multi-cylinder internal-combustion engine,

The ignition control circuit is set to each cylinder of the internal combustion engine,

The ignition system for internal combustion engines has control device (61), which remains defeated in control in the electric discharge The current controling signal that the electric current for flowing through the secondary coil is controlled out,

It is connected with the 1st shared signal wire (52) for transmitting the current controling signal and the 2nd on the control device and shares letter Number line (53),

The igniting that each signal wire (52a~52c) branched out from the 1st shared signal wire is connected to the spark plug is discontinuous Cylinder (#1, #3, #5) set be the 1st air cylinder group each cylinder the ignition control circuit,

The igniting that each signal wire (53a~53c) branched out from the 2nd shared signal wire is connected to the spark plug is discontinuous Cylinder (#2, #4, #6) set and i.e. the 2nd air cylinder group of set of the cylinder that is not included in the 1st air cylinder group each gas The ignition control circuit of cylinder.

25. ignition system for internal combustion engines according to claim 24, which is characterized in that

During including that 2 cylinders in the 1st air cylinder group successively carry out the igniting, it is included in the 2nd gas 1 cylinder in cylinder group carries out the igniting.

Technical field

This disclosure relates to a kind of ignition system for internal combustion engine.

Background technique

In recent years, in order to improve the specific fuel consumption in automobile engine, the Combustion System with unthickened fuel is being promoted The research of (lean combustion engine) or the related technology of EGR for making burning gases flow back to the cylinder of internal combustion engine.For these Technology studies following continuous discharge mode: in order to be effectively burned the fuel for including in gaseous mixture, near ignition timing Set time so that spark plug is constantly generated spark discharge.

As the ignition system of continuous discharge mode, as disclosed in Patent Document 1, in the winding of primary coil Midway have centre tap, after having started primary ignition in spark plug, from the power supply of Energy input to centre tap according to Secondary investment electric energy.The investment for only carrying out electric energy to the winding of the slave centre tap of primary coil to one end as a result, therewith and because of master The secondary current for the secondary current same direction that igniting generates successively additionally flows through secondary coil, and spark plug is thus made to continue to produce Raw spark discharge.After, the winding of slave centre tap to one end of primary coil is known as the 2nd winding, will from centre tap to The winding of the other end of primary coil is known as the 1st winding.At this point, by setting greatly the turn ratio of the 2nd winding and secondary coil, Without using booster circuit, secondary coil can be made, which to generate, can make spark plug continue to generate the secondary electrical of the size of spark discharge Pressure.

Summary of the invention

In addition, in patent document 1, having Energy input switch element, the Energy input switch element is for making The Energy input line of the centre tap investment electric energy of primary coil is switched on or switched off.Whenever Energy input switch element quilt When connection, primary current additionally flows through the 2nd winding via centre tap.On the other hand, by making Energy input switch member Part disconnects stop Energy input.Secondary current is set to remain defined value to improve ignitability while the control repeatedly. But it is open it has been found that the decline of primary current when being disconnected Energy input switch element is bigger, secondary current is anxious Decline acutely, is thus not easy that secondary current is made to remain defined value.

The disclosure is to complete to solve the above-mentioned problems, and main purpose is to provide one kind and be able to suppress discharging Maintain the ignition system for internal combustion engines that secondary current sharp becomes smaller in control period.

1st disclosure is a kind of ignition system for internal combustion engines, is had: spark plug is generated in the combustion chamber to internal combustion engine Combustion mixture igniting spark discharge；Ignition coil has primary coil and secondary coil, passes through the secondary coil pair The spark plug applies voltage；Defined voltage is applied to the primary coil by voltage application portion；3rd switch element, in shape The midway of the winding of the primary coil is provided with centre tap, carries out flowing to the centre tap from the voltage application portion Primary current be switched on and off；1st switch element is connected between one end and ground side of the 1st winding side, the 1st around Group is the winding from the centre tap to one end in the winding for be formed the primary coil；2nd switch element is connected to Between one end and ground side of 2 winding sides, the 2nd winding is in the winding for be formed the primary coil from the centre tap To the winding of the other end；Ignition control circuit, by the open and-shut mode, the 2nd switch that control the 1st switch element respectively The open and-shut mode of the open and-shut mode of element and the 3rd switch element generates control and electric discharge maintenance control to carry out electric discharge, Being switched on and off to make the spark plug for the primary current for flow to the 1st winding in control is generated in the electric discharge Generate the spark discharge, the electric discharge maintain the conducting for flow to the primary current of the 2nd winding in control and Cutting is to maintain the spark discharge generated in the spark plug；And current reflux path, for being flowed to from the 2nd winding The current reflux of 2nd switch element.

It is generated in control in electric discharge, controls the open and-shut mode of the 1st switch element, the open and-shut mode of the 2nd switch element respectively And the 3rd switch element open and-shut mode, carry out being switched on and off for the primary current for flowing to the 1st winding, thus make spark plug Generate spark discharge.In addition, maintaining in control in electric discharge, open and-shut mode, the 2nd switch element of the 1st switch element are controlled respectively Open and-shut mode and the 3rd switch element open and-shut mode, carry out being switched on and off for the primary current for flowing to the 2nd winding, by This maintains the spark discharge generated in spark plug.If then there is following worry at this point, current reflux path is not present: when When the 1st switch element and the 3rd switch element become off-state in electric discharge maintenance control, the primary current of the 2nd winding is flowed through not It flows and is cut off, during this period, the secondary current for flowing through spark plug stepwise declines to a great extent.For this point, this internal combustion Machine is provided with current reflux path with ignition system, even if therefore maintaining the 1st switch element and the 3rd switch member in control in electric discharge Part becomes off-state, and primary current also flows through the 2nd winding from current reflux path and slowly decays.Thereby, it is possible to inhibit The secondary current for flowing through spark plug stepwise sharply becomes smaller.In addition, having the case where backward dioded in the 1st switch element Under, via backward dioded, the 1st winding 12B, there are the current reflux paths of the 2nd winding 12C, but by the 1st winding 12B The back flow current of the influence of the voltage of middle generation, the 2nd winding 12C tails off, and secondary current still sharp becomes smaller.

2nd is disclosed in the 1st disclosure, and the current reflux path has the 1st diode, the cathode of the 1st diode Side is connected to the centre tap, and the anode-side of the 1st diode is connected to ground side.

As a result, electric discharge maintain control period in, the primary current flowed in current reflux portion without flow through the 1st winding and The 2nd winding is directly flowed through, therefore not will receive the influence of the 1st winding, primary current can be controlled with high precision.

3rd is disclosed in the 1st or the 2nd disclosure, and the 2nd switch element control is being disconnection by the ignition control circuit The 1st switch element and the 3rd switch element are controlled as closed state on the basis of state, opened later by the described 1st It closes element to be in an off state, thus carries out being switched on and off for the primary current for flowing to the 1st winding, by institute It states and controls the 2nd switch element and the 3rd switch element to close on the basis of the 1st switch element is in an off state 3rd switch element, is in an off state by conjunction state later, thus carries out the primary for flowing to the 2nd winding The conducting and reflux of electric current.

It, can be by by about being switched on and off for the primary current for flowing through the 1st winding by being set as above structure 2 switch elements are in an off state and control the 3rd switch element to switch the 1st switch element on the basis of closed state and coming Implement.In addition, conducting and reflux about the primary current for flowing through the 2nd winding, it can be by being by the control of the 1st switch element Off-state and the 2nd switch element is controlled to switch the 3rd switch element on the basis of closed state and implementing.

4th is disclosed in the 1st or the 2nd disclosure, and the 2nd switch element control is being disconnection by the ignition control circuit The 1st switch element and the 3rd switch element are controlled as closed state on the basis of state, opened later by the described 1st It closes element to be in an off state, thus carries out being switched on and off for the primary current for flowing to the 1st winding, by institute It states and controls the 2nd switch element and the 3rd switch element to close on the basis of the 1st switch element is in an off state 2nd switch element, is in an off state by conjunction state later, thus carries out the primary for flowing to the 2nd winding Electric current is switched on and off.

5th disclosure is a kind of ignition system for internal combustion engines, is had: spark plug is generated in the combustion chamber to internal combustion engine Combustion mixture igniting spark discharge；Ignition coil has primary coil and secondary coil, passes through the secondary coil pair The spark plug applies voltage；Voltage application portion, the midway for forming the winding of the primary coil are provided with centre tap, will advise Fixed voltage is applied to the centre tap；1st switch element is connected between one end and ground side of the 1st winding side, this 1 winding is the winding from the centre tap to one end in the winding for be formed the primary coil；2nd switch element, connection Between one end and ground side of the 2nd winding side, the 2nd winding is in the winding for be formed the primary coil from the centre Tap to the other end winding；Ignition control circuit, by the open and-shut mode and described for controlling the 1st switch element respectively The open and-shut mode of 2 switch elements generates control and electric discharge maintenance control to carry out electric discharge, generates in control and flowed in the electric discharge So that the spark plug is generated the spark discharge to being switched on and off for primary current of the 1st winding, ties up in the electric discharge The primary current that flow to the 2nd winding in control is held to be switched on and off to maintain to generate in the spark plug The spark discharge；And current reflux path, the electric current for flowing through the 2nd winding has been cut off by the 2nd switch element When for flowing through the current reflux of the 2nd winding.

It is generated in control in electric discharge, controls the open and-shut mode of the 1st switch element and the opening and closing shape of the 2nd switch element respectively State carries out being switched on and off for the primary current for flowing to the 1st winding, and spark plug is thus made to generate spark discharge.In addition, discharging Maintain in control, control the open and-shut mode of the 1st switch element and the open and-shut mode of the 2nd switch element respectively, flow to the 2nd around The primary current of group is switched on and off, and thus maintains the spark discharge generated in spark plug.If at this point, there is no electric currents to return Then there is following worry in flow path: when the 1st switch element and the 2nd switch element become off-state in electric discharge maintenance control When, the primary current for flowing through the 2nd winding is not flowed and is cut off, and during this period, flows through the secondary current of spark plug stepwise It declines to a great extent.For this point, this ignition system for internal combustion engines is provided with current reflux path, therefore maintains in control in electric discharge Even if the 1st switch element and the 2nd switch element become off-state, primary current is also from current reflux path to the 2nd winding one Side decaying is flowed through on one side.Thereby, it is possible to inhibit the secondary current for flowing through spark plug stepwise sharply to become smaller.

6th is disclosed in the 5th disclosure, and the current reflux path has the 2nd diode, the cathode of the 2nd diode Side is connected to the current path between the voltage application portion and the centre tap, the anode-side connection of the 2nd diode Current path between the 2nd winding and the 2nd switch element.

Maintained in control period in electric discharge as a result, the primary current that is flowed in current reflux portion without flow through the 1st winding, And the 2nd winding is flowed through while decaying, therefore not will receive the influence of the 1st winding, primary current can be controlled with high precision.

7th be disclosed in the 5th or 6 it is open in, generate and control as the electric discharge, the ignition control circuit is by described the 2 switch elements control the 1st switch element for closed state on the basis of being in an off state, later by the described 1st Switch element is in an off state, and being switched on and off for the primary current for flowing to the 1st winding is thus carried out, as described Electric discharge maintains control, and the ignition control circuit will be described on the basis of being in an off state the 1st switch element The control of 2nd switch element is closed state, is later in an off state the 2nd switch element, is thus flowed to institute State the conducting and reflux of the primary current of the 2nd winding.

It, can be by by about being switched on and off for the primary current for flowing through the 1st winding by being set as above structure 2 switch elements switch the 1st switch element on the basis of being in an off state to implement.In addition, about the first of the 2nd winding is flowed through The conducting and reflux of grade electric current, can be by switching the 2nd switch member on the basis of being in an off state the 1st switch element Part is implemented.

8th is disclosed in the 1st to any of 7th disclosure, has the 3rd diode, and the cathode side of the 3rd diode connects It is connected to the 2nd switch element, the anode-side of the 3rd diode is connected to the end with centre tap side opposite side.

If in the case where not set 3rd diode, starting to control by implementing electric discharge, it is possible to produce from the 2nd switch Element flows to the electric current of voltage application portion via the 2nd winding.That is, because the 1st winding cutting electric current generate magnetic flux with 2nd winding interlinkage, thus it is possible that generating voltage in the end of the 2nd winding and generating the electric current.In this case, by from 2 switch elements flow to the current canceling of voltage application portion, and primary current becomes smaller the amount being cancelled.As the countermeasure to this, setting Cathode side is connected to the 2nd switch element and anode-side be connected to the 2nd winding the 2nd switch element side end the 3rd two pole Pipe is also able to suppress from the 2nd switch element even if generating the voltage for causing the electric current as a result, and flows to voltage application portion.

9th is disclosed in the 1st to any of 7th disclosure, has the 3rd diode, and the cathode side of the 3rd diode connects It is connected to the centre tap, the anode-side of the 3rd diode is connected to the voltage application portion.

Accordingly, electric current is made to flow to voltage via the 2nd winding from the 2nd switch element even if starting control by electric discharge and generating The voltage of applying unit is also able to suppress electric current from the 2nd switch element and flows to voltage application portion.

10th disclosure is a kind of ignition system for internal combustion engines, is had: spark plug is generated in the combustion chamber to internal combustion engine Combustion mixture igniting spark discharge；Ignition coil has primary coil and secondary coil, passes through the secondary coil pair The spark plug applies voltage；Voltage application portion is provided with centre tap in the midway for the winding for forming the primary coil, will Defined voltage is applied to the centre tap；1st switch element is connected between one end and ground side of the 1st winding side, should 1st winding is the winding from the centre tap to one end in the winding for be formed the primary coil；3rd switch element, even It is connected between the centre tap and the 2nd winding as the winding from the centre tap to the other end；Ignition control circuit, By controlling the open and-shut mode of the 1st switch element and the open and-shut mode of the 3rd switch element respectively, to carry out electric discharge production Raw control and electric discharge maintain control, and generating in control in the electric discharge makes the spark plug generate the spark discharge, in the electric discharge It maintains to maintain the spark discharge generated in the spark plug in control；And current reflux path, for from the 2nd winding Flow to the current reflux of ground side.

It is generated in control in electric discharge, controls the open and-shut mode of the 1st switch element and the opening and closing shape of the 3rd switch element respectively State carries out being switched on and off for the primary current for flowing to the 1st winding, and spark plug is thus made to generate spark discharge.In addition, discharging Maintain in control, control the open and-shut mode of the 1st switch element and the open and-shut mode of the 3rd switch element respectively, flow to the 2nd around The primary current of group is switched on and off, and thus maintains the spark discharge generated in spark plug.If at this point, there is no electric currents to return Then there is following worry in flow path: when the 1st switch element and the 3rd switch element become off-state in electric discharge maintenance control When, the primary current for flowing through the 2nd winding is not flowed and is cut off, and during this period, flows through the secondary current of spark plug stepwise It declines to a great extent.For this point, this ignition system for internal combustion engines is provided with current reflux path, therefore maintains in control in electric discharge Even if the 1st switch element and the 3rd switch element become off-state, also due to the inductance ingredient of the 2nd winding and primary current from Current reflux path flows through while slowly decaying to the 2nd winding.Thereby, it is possible to inhibit to flow through the secondary current of spark plug Staged and sharp become smaller.

11st is disclosed in the 10th disclosure, and the current reflux path has the 4th diode, the yin of the 4th diode Pole side is connected to the current path between the 3rd switch element and the 2nd winding, and the anode-side of the 4th diode connects It is connected to ground side.

As a result, electric discharge maintain control period in, the primary current flowed in current reflux portion without flow through the 1st winding and Directly flow through the 2nd winding, therefore not will receive the influence of the 1st winding, primary current will not stepwise become smaller, and slowly by Degradation subtracts.When primary current reaches defined value, electric current is put into from the 3rd switch element again.When reaching defined value again When the control for disconnecting the 3rd switch element is repeated, therefore primary current can be controlled as defined value with high precision.

12nd is disclosed in the 10th or 11 disclosures, has the 3rd diode, the cathode side of the 3rd diode is connected to ground connection Side, the anode-side of the 3rd diode are connected to the end with centre tap side opposite side of the 2nd winding.

If in the case where not set 3rd diode, starting to control by implementing electric discharge, it is possible to produce from the 2nd winding The electric current of voltage application portion is flowed to via the 3rd switch element.In this case, because of the magnetic flux of the cutting electric current generation of the 1st winding Flowed to the current canceling of voltage application portion from the 2nd switch element, primary current becomes smaller the amount being cancelled.As pair to this Plan, setting cathode side is connected to the 2nd switch element and anode-side be connected to the 2nd winding the 2nd switch element side end the 3 diodes are also able to suppress even if starting the voltage that control generates the initiation electric current by electric discharge as a result, from the 3rd switch member Part flows to voltage application portion.

13rd is disclosed in the 10th or 11 disclosures, has the 3rd diode, and the cathode side of the 3rd diode is connected to described The end of the centre tap side of 2nd winding, the anode-side of the 3rd diode are connected to the 3rd switch element.

With this configuration, cause from the 2nd winding even if can also be generated when electric discharge starts control via the 3rd switch element The voltage of the electric current of voltage application portion is flowed to, can also inhibit to flow to the 3rd switch element from the 2nd winding by the 3rd diode.

14th is disclosed in the 10th to any of 13rd disclosure, generates control, described fire control as the electric discharge Circuit processed controls the 1st switch element for closed form on the basis of being in an off state the 3rd switch element 1st switch element, is in an off state by state later, thus carries out leading for the primary current for flowing to the 1st winding Lead to and cut off, maintain to control as the electric discharge, the 1st switch element control is being disconnection shape by the ignition control circuit The 3rd switch element is controlled as closed state on the basis of state, later by the 3rd switch element control to disconnect shape Thus state carries out the conducting and reflux that flow to the primary current of the 2nd winding.

It, can be by by about being switched on and off for the primary current for flowing through the 1st winding by being set as above structure 3 switch elements switch the 1st switch element on the basis of being in an off state to implement.In addition, about the first of the 2nd winding is flowed through The conducting and reflux of grade electric current, can be by switching the 3rd switch member on the basis of being in an off state the 1st switch element Part is implemented.

15th is disclosed in the 10th to any of 13rd disclosure, and the ignition control circuit is generated as the electric discharge Control controls the 1st switch element and the 3rd switch element for closed state, later by the 1st switch element with 3rd switch element is in an off state, and thus carries out the primary current for flowing to the 1st winding and the 2nd winding Be switched on and off, as the electric discharge maintain control, on the basis of the 1st switch element is in an off state will The 3rd switch element control is closed state, is later in an off state the 3rd switch element, is thus flowed Conducting and reflux to the primary current of the 2nd winding.

When electric discharge generates control, by controlling the 1st switch element and the 3rd switch element for closed state, primary electrical Stream also flows through the 2nd winding, as a result, generate the direction for the mutual magnetic flux that offsets each other respectively in the 1st winding and the 2nd winding Magnetic flux.The so-called conducting voltage that thereby, it is possible to inhibit the energization for generating control by electric discharge to generate in primary side, can remove Conducting voltage arcing prevent diode or using by lower voltage come cheap diode.

16th is disclosed in the 1st to any of 15th disclosure, and the number of turns of the 1st winding is more than the 2nd winding The number of turns.

When electric discharge maintains control for maintaining the voltage of the electric discharge generated in spark plug to be lower than when electric discharge generates control In order to make spark plug generate the required voltage of electric discharge.This is considered, by making the number of turns of the 1st winding be more than the number of turns of the 2nd winding, energy Enough make the secondary voltage generated in secondary coil in the case where being applied with primary voltage to the 2nd winding be lower than to the 1st around The secondary voltage that group generates in secondary coil in the case where being applied with primary voltage.

17th be disclosed in the 1st to any of 16th it is open in, by the number of turns of the secondary coil divided by the described 2nd around The obtained value of the number of turns of group is turn ratio, greater than will be in order to maintain to generate control by the electric discharge to make spark plug production The raw spark discharge and required voltage discharge maintenance voltage divided by the voltage applied by the voltage application portion Obtained value is voltage ratio.

Turn ratio be by by the number of turns of secondary coil divided by the number of turns of the 2nd winding come calculated.That is, secondary The more few then turn ratio of the number of turns of winding is bigger.At this point, if the number of turns for reducing secondary windings makes turn ratio be greater than supply voltage With electric discharge the ratio between maintenance voltage, then can be set to electric discharge maintain the voltage that the 2nd winding is applied in control period be lower than by The voltage that voltage application portion applies.It, can be from voltage application portion repeatedly to secondary as a result, during electric discharge maintains the implementation of control Grade winding circulation primary current, whenever at this time, secondary current flows through spark plug, as a result, it is possible to maintain to generate in spark plug Spark discharge.

18th is disclosed in the 3rd, the 14th, any of 15th disclosure, has secondary current test section, the secondary current Test section detects the secondary current for flowing through the spark plug, and the ignition control circuit maintains the phase of control implementing the electric discharge In, in the case where the absolute value of the secondary current detected by the secondary current test section is less than 1 threshold value, will The 3rd switch element control is closed state, in the exhausted of the secondary current detected by the secondary current test section In the case where being greater than the 2nd threshold value for being set to be greater than the 1st threshold value to value, the 3rd switch element control is disconnected State.

19th is disclosed in the 4th or the 7th disclosure, has secondary current test section, and secondary current test section detection is flowed through The secondary current of the spark plug, the ignition control circuit is in a period of implementing the electric discharge maintenance control, by described In the case that the absolute value for the secondary current that secondary current test section detects is less than the 1st threshold value, by the 2nd switch member Part control is closed state, is greater than in the absolute value of the secondary current detected by the secondary current test section and is set In the case where for the 2nd threshold value greater than the 1st threshold value, the 2nd switch element is in an off state.

By the way that current reflux path is arranged, control involved in the 18th disclosure and the 19th open related control can The decline of secondary current when cutting off primary current is slow, thus can make the absolute value of secondary current easily converge on from In the range of 1st threshold value to the 2nd threshold value.That is, by carrying out the feedback control under above-mentioned secondary current, can will time Grade electric current is controlled with high precision in desired range, and can reduce the variation sharply of secondary current, can reduce Because secondary current decline sharply caused by the blowing-out phenomenon of discharge spark etc..

20th is disclosed in the 1st to any of 4th disclosure, the 1st switch element, the 2nd switch element, institute It states the 3rd switch element, the ignition control circuit and the current reflux path and is accommodated in and be accommodated with the ignition coil Shell in.

The 1st switch element, the 2nd switch element, the 3rd switch are accommodated in the space for the ignition coil being accommodated in spark plug Element, ignition control circuit and current reflux portion.I.e. it is capable in the space for the ignition coil being accommodated in spark plug Interior this ignition system for internal combustion engines of receiving.Thereby, it is possible to cut down wiring, and it is able to suppress the Pang of this ignition system for internal combustion engines Bigization, therefore it is possible to realize the mountabilities improved to vehicle.

21st is disclosed in the 5th to any of 7th disclosure, the 1st switch element, the 2nd switch element, institute It states ignition control circuit and the current reflux path is accommodated in the shell for being accommodated with the ignition coil.

The 1st switch element, the 2nd switch element, point fire control are accommodated in the space for the ignition coil being accommodated in spark plug Circuit and current reflux processed portion.I.e. it is capable in the space for the ignition coil being accommodated in spark plug in receiving originally Combustion engine ignition system.Thereby, it is possible to cut down wiring, and it is able to suppress hugeization of this ignition system for internal combustion engines, therefore It is possible to realize the mountabilities improved to vehicle.

22nd be disclosed in the 10th to any of 15th it is open in, the 1st switch element, the 3rd switch element, The ignition control circuit and the current reflux path are accommodated in the shell for being accommodated with the ignition coil.

The 1st switch element, the 3rd switch element, point fire control are accommodated in the space for the ignition coil being accommodated in spark plug Circuit and current reflux processed portion.I.e. it is capable in the space for the ignition coil being accommodated in spark plug in receiving originally Combustion engine ignition system.Thereby, it is possible to cut down wiring, and it is able to suppress hugeization of this ignition system for internal combustion engines, therefore It is possible to realize the mountabilities improved to vehicle.

23rd is disclosed in the 1st to any of 22nd disclosure, and the 5th diode inverse parallel is connected to the 1st switch Element.

In any one ignition system in the 1 to the 22nd, if implement in the state that current reflux path is not present In the case that electric discharge maintains control, the primary current for flowing to the 2nd winding is connected to the 5th of the 1st switch element via inverse parallel Diode and the 1st winding, the current reflux of the 2nd switch element is flowed to from the 2nd winding.In this case, the electric current of reflux due to It is influenced by the 1st winding and the presence such as the size of its electric current becomes smaller, and the secondary current generated in secondary coil therewith becomes smaller The worry of its controlling decline.For this point, in the 1st to any of 22nd open related internal combustion engine igniting system Current reflux path is provided in system, therefore electric current flows back via current reflux path to the 2nd winding in electric discharge maintenance control, Without via the 1st winding.Thereby, it is possible to inhibit the secondary current for flowing through spark plug sharp to become smaller, therefore for by the 5th two pole Pipe inverse parallel is connected to the structure of the 1st switch element, this ignition system could also say that preferred structure.

In the 24th disclosure, in the 1st to any of 23rd disclosure, the internal combustion engine is multi-cylinder internal-combustion engine, described Ignition control circuit is set to each cylinder of the internal combustion engine, has control device, which maintains to control in the electric discharge Output is connected with transmitting to the control device for controlling the current controling signal for the electric current for flowing through the secondary coil in system 1st shared signal wire of the current controling signal and the 2nd shared signal wire branch out each from the 1st shared signal wire Signal wire is connected to the set i.e. described fire control of each cylinder of the 1st air cylinder group of the discontinuous cylinder of igniting of the spark plug Circuit processed, each signal wire branched out from the 2nd shared signal wire are connected to the discontinuous cylinder of igniting of the spark plug Set and do not include cylinder in the 1st air cylinder group the set i.e. ignition control of each cylinder of the 2nd air cylinder group Circuit.

In the case where internal combustion engine is multi-cylinder internal-combustion engine (such as internal combustion engine more than 5 cylinders), when will be used for controlling stream When crossing the current controling signal of the electric current of secondary coil and being shared in whole cylinders, it is possible in the continuous gas of the igniting of spark plug A part overlapping of current controling signal in cylinder.

For this point, in said structure, by control device output for maintaining control in control to flow through time in electric discharge The current controling signal of the electric current of grade coil.To control device be connected with transmitting current controling signal the 1st shared signal wire and 2nd shared signal wire.Each signal wire branched out from the 1st shared signal wire is connected to the discontinuous cylinder of igniting of spark plug Set is the ignition control circuit of each cylinder of the 1st air cylinder group.Therefore, the igniting of the cylinder of the 1st air cylinder group is discontinuous, can press down System is passed to a part overlapping of the current controling signal of the cylinder of the 1st air cylinder group.In addition, from the 2nd shared signal wire branch Each signal wire out is connected to the set of the discontinuous cylinder of igniting of spark plug and does not include the cylinder in the 1st air cylinder group Set is the ignition control circuit of each cylinder of the 2nd air cylinder group.Therefore, the igniting of the cylinder of the 2nd air cylinder group is discontinuous, can press down System is passed to a part overlapping of the current controling signal of the cylinder of the 2nd air cylinder group.Thus, even if internal combustion engine is in multi cylinder Combustion engine can also control the electric current for flowing through secondary coil using current controling signal.

Specifically, in open the 25th, include successively carried out in 2 cylinders in the 1st air cylinder group described in During igniting, the igniting is carried out including 1 cylinder in the 2nd air cylinder group.

During including that 2 cylinders in the 1st air cylinder group are successively lighted a fire, including 1 in the 2nd air cylinder group A cylinder is lighted a fire, thus it enables that discontinuous and the cylinder of the 2nd air cylinder group the igniting of lighting a fire of the cylinder of the 1st air cylinder group Discontinuously.

Detailed description of the invention

Above-mentioned purpose and other purposes, feature, advantage about the disclosure by referring to accompanying drawing and following detailed descriptions, It can become more apparent.In the attached drawing:

Fig. 1 is the schematic structural diagram of ignition system involved in the 1st embodiment,

Fig. 2 is to indicate to have started to discharge to start the figure of the flowing of the primary current in the case where controlling,

Fig. 3 is the figure for indicating to implement the flowing of the primary current in the case that electric discharge maintenance controls,

Fig. 4 is to indicate to implement in the ignition system of not set current reflux path in the case that electric discharge maintains to control The figure of the variation of primary current and secondary current,

Fig. 5 is the figure for indicating to implement the flowing of the primary current of the reflux in the case that electric discharge maintenance controls,

Fig. 6 is the figure for simply showing the content by secondary current control in the desired range,

Fig. 7 is the time diagram for indicating the movement of control of discharge involved in present embodiment,

Fig. 8 is the schematic structural diagram for indicating the casing peripheral for especially containing ignition coil of internal combustion engine,

Fig. 9 is the time diagram for indicating the movement of control of discharge involved in other examples,

Figure 10 is other figures for indicating the setting place of the 3rd diode of the structure applied to Fig. 1,

Figure 11 is other schematic structural diagrams for indicating ignition system involved in the 1st embodiment,

Figure 12 is the figure for indicating the setting of instruction value of the secondary current carried out based on ignition signal and Energy input signal,

Figure 13 is the figure for indicating the setting of instruction value of the secondary current carried out based on ignition signal and Energy input signal,

Figure 14 is the figure for indicating the setting of instruction value of the secondary current carried out based on ignition signal and Energy input signal,

Figure 15 is the time diagram for indicating the movement of control of discharge involved in other examples shown in Figure 11,

Figure 16 is other schematic structural diagrams for indicating ignition system involved in the 1st embodiment,

Figure 17 is other schematic structural diagrams for indicating ignition system involved in the 1st embodiment,

Figure 18 is the time diagram for indicating the movement of control of discharge involved in other examples shown in Figure 17,

Figure 19 is other schematic structural diagrams for indicating ignition system involved in the 1st embodiment,

Figure 20 is the schematic structural diagram of ignition system involved in the 2nd embodiment,

Figure 21 is the time diagram for indicating the movement of control of discharge involved in the 2nd embodiment,

Figure 22 is other figures for indicating the setting place of the 3rd diode of the structure applied to the 2nd embodiment,

Figure 23 is other schematic structural diagrams for indicating ignition system involved in the 2nd embodiment,

Figure 24 is the time diagram for indicating the movement of control of discharge involved in other examples shown in Figure 23,

Figure 25 is the figure for indicating the modification of setting place of the 3rd diode in other examples shown in Figure 23,

Figure 26 is the schematic structural diagram of ignition system involved in the 3rd embodiment,

Figure 27 is the time diagram for indicating the movement of control of discharge involved in the 3rd embodiment,

Figure 28 is other figures for indicating the setting place of the 3rd diode applied to the 3rd embodiment,

Figure 29 is other schematic structural diagrams for indicating ignition system involved in the 3rd embodiment,

Figure 30 is the time diagram for indicating the movement of control of discharge involved in other examples shown in Figure 29,

Figure 31 is will to generate the secondary electrical that control generates by being applied to electric discharge involved in other examples of the 3rd embodiment Pressure generates the figure that the secondary voltage that control generates compares with by previous electric discharge,

Figure 32 is the outline knot for indicating the Engine ECU applied to 4 cylinder engines and connecting with each ignition control circuit Composition,

Figure 33 is the time diagram for indicating the ignition signal and Energy input signal of comparative example,

Figure 34 is the outline knot for indicating the Engine ECU applied to 6 cylinder engines and connecting with each ignition control circuit Composition,

Figure 35 is the time diagram for indicating the ignition signal and Energy input signal of embodiment shown in Figure 34,

Figure 36 is the time diagram for indicating to be based only upon the movement of control of discharge of ignition signal,

Figure 37 is the schematic structural diagram for executing the ignition system of control of discharge of Figure 36.

Specific embodiment

<the 1st embodiment>

It is explained with reference to the 1st embodiment.This ignition system 10 is equipped on internal combustion engine (hereinafter referred to as engine) 60 (referring to Fig. 8).Illustrate the structure of ignition system 10 referring to Fig.1.Spark plug 20, ignition coil are provided in ignition system 10 11, the 3rd switch element 14, the 1st switch element 15, the 2nd switch element 16, power supply unit (being equivalent to voltage application portion) 17 and point Fiery control circuit 30.

Ignition coil 11 has primary coil 12, secondary coil 13 and iron core 23.In the winding for forming primary coil 12 Midway be provided with centre tap 12A, centre tap 12A is connected to power supply unit 17 via the 3rd switch element 14.Therefore, the 3rd In the case that switch element 14 is closed state, defined voltage is applied to centre tap 12A from power supply unit 17.In addition, being formed Winding i.e. the 1st side winding 12B of the relatively more side of the number of turns of slave centre tap 12A to one end in the winding of primary coil 12 One end be connected to the 1st switch element 15.Form the number of turns phase of the slave centre tap 12A in the winding of primary coil 12 to one end The 2nd switch element 16 is connected to via the 3rd diode 19 to one end of i.e. the 2nd side winding 12C of winding of few side.

3rd switch element 14 is MOSFET (Metal Oxide Semiconductor Field Effect Transistor: Metal Oxide Semiconductor Field Effect Transistor), there is the 3rd control terminal 14G, the 3rd power supply side terminal 14D And the 3rd ground connection side terminal 14S.3rd switch element 14 is configured to based on the 3rd control letter for being input to the 3rd control terminal 14G Number control the 3rd power supply side terminal 14D and the 3rd ground connection side terminal 14S between energization on-off.In the present embodiment, it the 3rd connects Ground side terminal 14S is connected to centre tap 12A, and the 3rd power supply side terminal 14D is connected to power supply unit 17.

1st switch element 15 is IGBT (the Insulated Gate Bipolar as mos gate pole construction transistor Transistor: insulated gate bipolar transistor), there is the 1st control terminal 15G, the 1st power supply side terminal 15C and the 1st ground connection Side terminal 15E.1st switch element 15 is configured to based on the 1st electricity of the 1st control signal control for being input to the 1st control terminal 15G The on-off of energization between the ground connection of source terminal 15C and the 1st side terminal 15E.In the present embodiment, the 1st power supply side terminal 15C It is connected to the 1st winding 12B.In addition, the 1st ground connection side terminal 15E is grounded.

2nd switch element 16 is MOSFET, has the 2nd control terminal 16G, the 2nd power supply side terminal 16D and the 2nd ground connection Side terminal 16S.2nd switch element 16 is configured to based on the 2nd electricity of the 2nd control signal control for being input to the 2nd control terminal 16G The on-off of energization between the ground connection of source terminal 16D and the 2nd side terminal 16S.In the present embodiment, the 2nd power supply side terminal 16D It is connected to the 2nd winding 12C via the 3rd diode 19, the 2nd ground connection side terminal 16S is grounded.Illustrate below about the 3rd diode 19 details.

Centre tap 12A is also attached to current reflux path L1 in addition to being connected to the 3rd switch element 14.Current reflux road Diameter L1 has the 1st diode 18.The cathode side of 1st diode 18 is connected to centre tap 12A, the anode-side of the 1st diode 18 It is grounded.

Arcing when 1st end of secondary coil 13 is powered via primary coil prevents diode 21 from (hereinafter referred to as preventing two Pole pipe) and connect with current detecting with path L2.In the current detecting electricity for being provided with secondary current detection in the L2 of path Resistance body 22.1st end of resistor body 22 is connect, the 2nd of resistor body 22 the via diode 21 is prevented with the 1st end of secondary coil 13 End is connected to ground side.Prevent diode 21 prevent to the 1st winding 12B be powered when generate, from ground side via resistor body 22 towards the 2nd end side of secondary coil 13 direction electric current it is through-flow.Thus the generation when being powered to primary coil 12 is prevented Primary coil 12 conducting voltage under arcing, and in order to be defined as secondary current (discharge current) I2 from spark plug 20 Towards the direction of secondary coil 13 and its anode is connected to the 1st end side of secondary coil 13.

Ignition control circuit 30 is to receive the ignition signal IGt of not shown Engine ECU (control device) output Mode is connected to Engine ECU.The ignition signal IGt be used to provide with the state of the indoor gas of burning of engine 60 and The output of required engine 60 corresponding optimal ignition timing and secondary current (discharge current).In addition, ignition control is electric Road 30 is connected in a manner of controlling the 3rd switch element 14, the 1st switch element 15 and the on-off action of the 2nd switch element 16 3rd control terminal 14G, the 1st control terminal 15G and the 2nd control terminal 16G.

Ignition control circuit 30 is based on from the received ignition signal IGt output of Engine ECU for the 3rd switch element 14 16 institute of 1st control terminal 15G and the 2nd switch element possessed by possessed 3rd control terminal 14G, the 1st switch element 15 Driving signal IG1, IG2, IG3 of control is opened and closed in the 2nd control terminal 16G having respectively.

Implement following electric discharge first as a result, to start to control: forming the path (ginseng for flowing to the 1st winding 12B from power supply unit 17 According to Fig. 2), being switched on and off for the primary current I1 of the 1st winding 12B is flowed through in control on this basis, thus produces spark plug 20 Raw spark discharge.After implementing electric discharge and starting control, implements following electric discharge and maintain control: being formed from power supply unit 17 and flow to the 2nd The path (referring to Fig. 3) of winding 12C, being switched on and off for the primary current I1 of the 2nd winding 12C is flowed through in control on this basis, Thus maintain the spark discharge generated in spark plug 20.At this point, the detection stream overcurrent detection secondary current I2 of path L2, Therefore current detecting path L2 and ignition control circuit 30 are equivalent to secondary current test section.

Illustrate that electric discharge starts the control content of control.In a period of implementation electric discharge starts control, by the 2nd switch element 16 Always it is in an off state.On this basis, the 3rd switch element 14 and the 1st switch element 15 are controlled as closed state.By This primary current I1 as shown in Figure 2 flows to the 1st winding 12B from power supply unit 17.Then, it is being incited somebody to action after the 1st stipulated time 1st switch element 15 is in an off state.The conducting quilt of the primary current I1 of the 1st winding 12B is flowed to from power supply unit 17 as a result, Cutting induces high voltage, the gas-insulated breakdown in the spark gap portion of spark plug 20, thus in spark in secondary coil 13 Spark discharge is generated in plug 20.

Herein, it is contemplated that the case where above-mentioned electric discharge starts control is implemented in the state of not set 3rd diode 19.In In this case, flowing through primary current I1 from power supply unit 17 to the 1st winding 12B, on the other hand generated sometimes from the 2nd switch element 16 The electric current of power supply unit 17 is flowed to via the 2nd winding 12C.That is, magnetic loop is constituted by the 1st winding 12B and the 2nd winding 12C, Or leakage magnetic flux interlinkage, thus when having cut off the primary current I1 for flowing through the 1st winding 12B using the 1st switch element 15, sometimes Negative voltage is generated in the 2nd winding 12C, electric current flows to power supply unit 17 from ground side.If producing from the 2nd switch element 16 In the case where the electric current for flowing to power supply unit 17 via the 2nd winding 12C, the generated electric current with from power supply unit 17 flow through the 1st The primary current I1 of winding 12B cancels each other out, and thus primary current I1 becomes smaller the amount being cancelled.As the countermeasure to this, setting 3rd diode 19, the cathode side of the 3rd diode 19 are connected to the 2nd switch element 16, the anode-side of the 3rd diode 19 It is connected to the end of 16 side of the 2nd switch element of the 2nd winding 12C.Thereby, it is possible to inhibit electric current from the 2nd switch element 16 via 2nd winding 12C flows to power supply unit 17, can prevent electric discharge from starting the decline of the generation voltage of control.

After implementing electric discharge and starting control, implements electric discharge and maintain control.Implement to discharge maintain control in a period of, by the 1 switch element 15 is in an off state always.In this state, it is by the 3rd switch element 14 and the control of the 2nd switch element 16 Closed state, thus primary current I1 as shown in Figure 3 flows to the 2nd winding 12C from power supply unit 17.Then, by the 3rd switch member Part 14 is in an off state, and thus cuts off the conducting that the primary current I1 of the 2nd winding 12C is flowed to from power supply unit 17.

If in ignition system 10 in the case where not set current reflux path L1, if by by the 3rd switch element 14 are in an off state to cut off the conducting for the primary current I1 for flowing to the 2nd winding 12C, then flow through the primary of the 2nd winding 12C Electric current I1 is cut off, and primary current I1 stepwise becomes 0.As a result, as shown in figure 4, whenever the 3rd switch element 14 is controlled The absolute value of secondary current I2 also staged and sharp becomes smaller when for off-state, therewith such as discharge spark because of quilt air-flow It blows out and is possible to be unable to maintain that the spark discharge generated in spark plug 20.

For this point, current reflux path L1 is provided in this ignition system 10, therefore, when by the 3rd switch element 14 when being in an off state, as shown in figure 5, also by the electricity of the 2nd winding 12C after using the cutting of the 3rd switch element 14 Sense and primary current I1 flows back via current reflux path L1 to the 2nd winding 12C.Primary current I1 slowly decays as a result, energy Enough inhibition flow through the order of magnitude ladder type of the secondary current I2 of spark plug 20 and sharp become smaller.

In addition to this, current reflux path L1 is connected to centre tap 12A, thus during implementing to discharge maintenance control Interior, the primary current I1 flowed in current reflux path L1 directly flows through the 2nd winding 12C without flow through the 1st winding 12B.By This, not will receive the influence of the 1st winding 12B, therefore can with high precision and high responsiveness controls primary current I1.

In addition, primary current I1 flows through the 2nd winding from power supply unit 17 repeatedly in a period of implementing to discharge maintenance control 12C, but according to the setting for by the number of turns of secondary coil 13 divided by the obtained value of the 2nd winding 12C being turn ratio, need to apply Voltage to the 2nd winding 12C may be above the defined voltage that power supply unit 17 can apply.In this case, Wu Facong Power supply unit 17 circulates primary current I1 to the 2nd winding 12C, is possible to be unable to maintain that as its result and generates in spark plug 20 Spark discharge.

As the countermeasure to this, in the present embodiment, ignition coil 11 is configured to above-mentioned turn ratio will put greater than conduct Electric maintenance voltage divided by the obtained value of defined voltage applied by power supply unit 17 voltage ratio.Maintenance voltage of discharging is to pass through Electric discharge generates voltage when control is maintained come the spark discharge for generating spark plug 20.

Electric discharge maintenance voltage changes according to the operating conditions of Engine ECU, but mean time is in the range of 2~3kV It is able to maintain that the spark discharge generated in spark plug 20, therefore maintenance voltage of discharging is set to admittedly in the range of 2~3kV Fixed value.That is, the more few then turn ratio of the number of turns of the 2nd winding 12C is bigger since voltage ratio is fixed value.As a result, The number of turns for reducing by the 2nd winding 12C makes turn ratio be greater than voltage ratio, and thus, it is possible to be set so that maintaining control implementing to discharge The voltage for being applied to the 2nd winding 12C is needed to be lower than the voltage that power supply unit 17 can apply in a period of system.Implementing as a result, In a period of electric discharge maintains control, it can circulate primary current I1 to the 2nd winding 12C repeatedly from power supply unit 17, secondary electrical at this time Stream I2 flows through spark plug 20, as the spark discharge that as a result, it is possible to maintain to generate in spark plug 20.In turn, it does not need in electricity The voltage boosters such as DC-DC converter are set in source portion 17, and it is possible to realize the simplification of ignition system 10.

In the present embodiment, in a period of implementing to discharge maintenance control, ignition control circuit 30, which gradually detects, to be flowed through The secondary current I2 of current detecting path L2.Then, control shown in fig. 6 is implemented based on the secondary current I2 detected.In In Fig. 6, " secondary current I2 " indicates to flow through the value of the secondary current I2 of current detecting path L2." the 3rd control signal " is used high Level/low level indicates whether that the 3rd control terminal 14G to the 3rd switch element 14 outputs the 3rd control signal.Specifically, In the case where outputing the 3rd control signal to the 3rd control terminal 14G of the 3rd switch element 14 (in " the 3rd control letter of Fig. 6 Number " in become high level in the case where), the 3rd switch element 14 is controlled as closed state.In addition, not to the 3rd switch element (become low level in " the 3rd control signal " of Fig. 2 in the case where 14 the 3rd control signal of the 3rd control terminal 14G output In the case of), the 3rd switch element 14 is controlled as off-state." the 2nd control signal " with high level/low level indicate whether to 2nd control terminal 16G of the 2nd switch element 16 outputs the 2nd control signal.

As shown in fig. 6, maintaining the absolute value of the secondary current I2 detected in a period of control less than the 1st implementing to discharge In the case where threshold value, the 3rd switch element 14 and the 2nd switch element 16 are controlled as closed state.Thereby, it is possible to from power supply unit 17 To the 2nd winding 12C circulation primary current I1, the absolute value for flowing through the secondary current I2 of spark plug 20 therewith becomes larger.It is detecting Secondary current I2 absolute value be greater than and be set to be greater than the 2nd threshold value of the 1st threshold value in the case where, by the 3rd switch element 14 It is in an off state.The primary current I1 for flowing through the 2nd winding 12C from power supply unit 17 is cut off as a result, flows through time of spark plug 20 The absolute value of grade electric current I2 becomes smaller.When having cut off primary current I1 using the 3rd switch element 14, the primary electrical of the 2nd winding 12C Stream I1 flows with flowing back in current reflux path L1, gradually becomes smaller, therefore secondary current I2 slowly gradually decays.In this way, By implementing above-mentioned control, secondary current I2 can be made slowly to change, can easily be converged on from the 1st threshold value to the 2nd threshold In the range of value.In addition, the decline of secondary current I2 sharply can be prevented, therefore can implement that discharge spark can be prevented The control of discharge of blowing-out.

Then, the mode of control of discharge involved in present embodiment is illustrated referring to Fig. 7.

In Fig. 7, " the primary current I1 flowed in the 1st winding " indicates the primary current flowed in the 1st winding 12B I1.Similarly, " the primary current I1 flowed in the 2nd winding " indicates the primary current I1 flowed in the 2nd winding 12C.Separately Outside, " secondary voltage V2 " indicates the value for being applied to the secondary voltage V2 of spark plug 20." the 1st control signal " uses high level/low electricity It is flat to indicate whether that the 1st control terminal 15G to the 1st switch element 15 outputs the 1st control signal.

Based on the ignition signal IGt exported by Engine ECU, electric discharge is implemented by ignition control circuit 30 and generates control.In Electric discharge generates in control, and the 3rd control signal is sent to the 3rd control terminal 14G of the 3rd switch element 14, and the 1st control letter Number it is sent to the 1st control terminal 15G (reference time t1) of the 1st switch element 15.The 2nd switch element 16 is still disconnected as a result, Open state, the 3rd switch element 14 and the 1st switch element 15 are controlled as closed state.As a result, primary current I1 is from power supply unit 17 flow to the 1st winding 12B, and the primary current I1 flowed in the 1st winding 12B becomes larger.

Then, after the 1st stipulated time, in still maintain the 3rd control signal to be sent to the 3rd switch element 14 the In the state of the state of 3 control terminal 14G, the output of the 1st control signal is stopped (reference time t2).1st switch member as a result, Part 15 is controlled as off-state, and the electric current for flowing to the primary current I1 of the 1st winding 12B is cut off, and feels in secondary coil 13 High voltage should be gone out, generate spark discharge in spark plug 20.

Then, electric discharge is implemented by ignition control circuit 30 and maintains control.It is maintained in control in electric discharge, by ignition control circuit 30 gradually detection stream overcurrent detection use path L2 secondary current I2.Then, in the absolute value of the secondary current I2 detected In the case where less than the 1st threshold value, the control for making primary current I1 flow to the 2nd winding 12C from power supply unit 17 is carried out, to avoid in fire The spark discharge generated in flower plug 20 disappears.At the time point of the time t3 of Fig. 7, it is controlled as closing in the 3rd switch element 14 Conjunction state and the 2nd switch element 16 are controlled as the state of off-state, therefore the 2nd control signal is sent to the 2nd switch member 2nd control terminal 16G of part 16.The 2nd switch element 16 is controlled as closed state as a result, and primary current I1 flows through the 2nd winding 12C, secondary current I2 increase.

In the case where the absolute value of the secondary current I2 detected is greater than 2 threshold value, the output of the 3rd control signal is stopped Only (reference time t4).The 3rd switch element 14 is controlled as off-state as a result, flows to the 2nd winding 12C's from power supply unit 17 Primary current I1 is cut off, and primary current I1 flows back via current reflux path L1 to the 2nd winding 12C.Hereafter, the 3rd is controlled The on-off action of switch element 14 to be greater than the 1st threshold value by the absolute value of the current detecting path L2 secondary current I2 detected And less than the 2nd threshold value, continue persistently to generate spark discharge (when reference in spark plug 20 until thus end during electric discharge Between t3-5).

In addition, Fig. 7 is contemplated under the operational situation that indoor flow velocity at every moment changes of burning.Implementing electric discharge dimension In a period of holding control, due tos air-flow etc. when discharge spark length and the when of elongation and shorten, secondary voltage V2 is unstable (when reference Between t3-5).But on the other hand, secondary current I2 can steadily be controlled in the range of from the 1st threshold value to 2 threshold value, Even if therefore the operating condition unstable in secondary voltage V2, this ignition system 10 generate in spark plug 20 due to being able to suppress Spark discharge blown out, therefore also can steadily maintain spark discharge.

The many structures for constructing this ignition system 10 are accommodated in the shell 50 for containing ignition coil 11.Use Fig. 8 To illustrate the structure in shell 50.

Fig. 8 especially shows the construction on 50 periphery of shell.Has ignition coil 11 in shell 50, by outside from inside Sequence installation primary coil 12, secondary coil 13 and the iron core 23 stacked on top of one another of side.In addition, iron core 23 and shell 50 it Between be formed with defined space, be provided in the defined space the 3rd switch element 14, the 1st switch element the 15, the 2nd switch Element 16, current reflux path L1, current detecting path L2 and ignition control circuit 30.

Being provided between secondary coil 13 and shell 50 prevents diode 21, prevents the anode-side of diode 21 from passing through cloth Line is electrically connected to the 1st end of secondary coil 13.In addition, preventing the cathode side of diode 21 to be connected to is set to above-mentioned defined sky Interior current detecting path L2.

As more than, the building ignition system 10 other than power supply unit 17, spark plug 20 can be accommodated in shell 50 Other structures.Thereby, it is possible to cut down wiring, and it is able to suppress hugeization of this ignition system 10, therefore it is possible to realize raisings To the mountability of vehicle.

Additionally it is possible to the 1st embodiment be changed as follows to implement.

The mode of control of discharge involved in the 1st embodiment is illustrated referring to Fig. 7.In the Fig. 7, based on by sending out The ignition signal IGt of motivation ECU output implements electric discharge by ignition control circuit 30 and generates control, produces in spark plug 20 later Raw spark discharge, during until the absolute value of secondary current I2 becomes smaller than 1 threshold value (reference time t1-t3), 2nd switch element 16 is controlled as off-state, and the 3rd switch element 14 is controlled as closed state.About this, also can be set to Such as flowering structure: as recorded in Fig. 9, being controlled as off-state in secondary coil 13 by the 1st switch element 15 High voltage is induced, later during until the absolute value of secondary current I2 becomes smaller than 1 threshold value, is outputing the 2nd Stop the output (reference time t8) of the 3rd control signal on the basis of control signal.By the structure, also function to according to above-mentioned The effect and effect of embodiment.

In the 1st embodiment, in a period of implementing to discharge maintenance control, in the exhausted of the secondary current I2 detected To value less than the 1st threshold value in the case where the 3rd switch element 14 be controlled as closed state, in the exhausted of the secondary current I2 detected The 3rd switch element 14 is controlled as off-state in the case where being greater than the 2nd threshold value to value.It, can also be with secondary current about this The value of I2 controls the open and close control of the 3rd switch element 14 independently with the defined time.Such as control is maintained implementing to discharge During, every open and-shut mode by switching the 3rd switch element 14 when 2 stipulated time.In this case, implementing electric discharge dimension Detection secondary current I2 is not needed in a period of holding control, therefore does not need to form current detecting path L2, and it is possible to realize points The cost cutting of fiery system 10.

In the 1st embodiment, in a period of implementing to discharge maintenance control, the 1st switch element 15 is controlled always For off-state.In this state, in the case where the absolute value of secondary current I2 is less than 1 threshold value, by the 3rd switch element 14 It is closed state with the control of the 2nd switch element 16, in the case where the absolute value of secondary current I2 is greater than 2 threshold value, makes the 2nd to open It closes element 16 to be still in an off state the 3rd switch element 14 for closed state, thus carries out flowing to the 2nd from power supply unit 17 The conducting and reflux of the primary current I1 of winding 12C.Also it can replace the electric discharge and maintain control, maintain control implementing to discharge During, the 1st switch element 15 is in an off state always.In this state, it is less than in the absolute value of secondary current I2 In the case where 1st threshold value, the 3rd switch element 14 and the 2nd switch element 16 are controlled as closed state, in the exhausted of secondary current I2 In the case where being greater than the 2nd threshold value to value, make the 3rd switch element 14 still and be closed state and control the 2nd switch element 16 to be disconnected Thus open state carries out being switched on and off for the primary current I1 that the 2nd winding 12C is flowed to from power supply unit 17.Thus it can also rise To effect in a same manner as in the first embodiment.

In the 1st embodiment, it is provided with the 3rd diode 19, the cathode side of the 3rd diode 19 is connected to the 2nd and opens The anode-side of pass the 16, the 3rd diode 19 of element is connected to the end of 16 side of the 2nd switch element of the 2nd winding 12C.About this, The cathode side that can also be configured to the 3rd diode 19 as shown in Figure 10 is connected to centre tap 12A and anode-side is connected to 3rd ground connection side terminal 14S of the 3rd switch element 14.The 3rd diode 19 can be prevented accidentally by power supply unit 17 with antipole as a result, Property installation when electric current adverse current.In the structure involved in this other example, be also possible to: current reflux path L1 has The cathode side of 1st diode 18 is connected to the current path between centre tap 12A and the 3rd diode 19, the 1st diode 18 Anode-side is grounded.

In this case, can also as shown in Figure 11 ignition control circuit 30 to receive not shown engine The mode of the ignition signal IGt and Energy input signal IGw of ECU output are connected to Engine ECU.Ignition signal IGt (open by electric discharge Beginning signal) start in control (electric discharge generates control) for being set in electric discharge to during the energization of the 1st winding 12B.Energy input Signal IGw (current controling signal) is used to be set in electric discharge and the instruction value of secondary current I2 and electric discharge in control is maintained to maintain control Tail end.In addition, ignition control circuit 30 is to control the 1st switch element 15, the 2nd switch element 16 and the 3rd switch member The mode of the on-off action of part 14 is connected to the 1st control terminal 15G, the 2nd control terminal 16G and the 3rd control terminal 14G.This Outside, the 3rd diode 19 can also be configured on the contrary with the 3rd switch element 14.

Such as shown in Figure 12~14, set according to ignition signal IGt and Energy input signal IGw to the 1st winding 12B's During energization and electric discharge maintains the instruction value of the secondary current I2 in control.That is, during ignition signal IGt is high level It is powered to the 1st winding 12B.In addition, being set for the upward period of the upward period and Energy input signal IGw of ignition signal IGt The time difference is set, the instruction value of the length setting secondary current I2 based on the time difference.

For example, the instruction value of secondary current I2 is set as 100ms in the case where the time difference is 0ms, it is in the time difference The instruction value of secondary current I2 is set as 50ms in the case where 1ms, in the case where the time difference is 2ms by secondary current I2's Instruction value is set as 20ms.Moreover, the instruction value of secondary current I2 is set as above-mentioned 1st threshold value, by the finger to secondary current I2 Value is enabled to be set as above-mentioned 2nd threshold value plus the obtained value of specified value.In addition, the instruction value of the time difference and secondary current I2 Combination can arbitrarily change.In addition, setting the end that electric discharge maintains control according to the downward period of Energy input signal IGw Period.Based on above-mentioned ignition signal IGt carry out the energization to the 1st winding 12B during setting and based on Energy input believe The instruction value for the secondary current I2 that number IGw is carried out and electric discharge maintain the setting of the tail end of control to can also apply to other realities Apply the modification of mode and they.

As shown in figure 15, in a period of implementation electric discharge starts control, signal is controlled by the 2nd switch element 16 according to the 2nd It is in an off state.On this basis, ignition signal IGt rises, will thus according to the 1st control signal and the 3rd control signal 1st switch element 15 and the control of the 3rd switch element 14 are closed state, and primary current I1 flows to the 1st winding from power supply unit 17 12B.Then, ignition signal IGt declines, and controls signal for the 1st switch element 15 and the 3rd thus according to the 1st control signal and the 3rd Switch element 14 is in an off state.The conducting for flowing to the primary current I1 of the 1st winding 12B from power supply unit 17 as a result, is cut It is disconnected, high voltage, the gas-insulated breakdown in the spark gap portion of spark plug 20, thus in spark plug are induced in secondary coil 13 Spark discharge is generated in 20.

Then, after implementing electric discharge and starting control, implement electric discharge and maintain control.During implementing to discharge maintenance control It is interior, the 1st switch element 15 is in an off state according to the 1st control signal.In this state, according to the 2nd control signal and 3rd control signal controls the 2nd switch element 16 and the 3rd switch element 14 for closed state, and thus primary current I1 is from power supply Portion 17 flows to the 2nd winding 12C.Then, in the case where the absolute value of secondary current I2 is greater than 2 threshold value, believed according to the 3rd control Number the 3rd switch element 14 is in an off state, thus cuts off the primary current I1 for flowing to the 2nd winding 12C from power supply unit 17 Conducting.Primary current I1 flows back via current reflux path L1 and to the 2nd winding 12C as a result, and the electric current of the 2nd winding 12C is slow Slowly gradually decay, secondary current I2 is also gradually reduced.Then, the 1st threshold value is become smaller than in the absolute value of secondary current I2 In the case of, again according to the 3rd control signal, the 3rd switch element 14 is controlled as closed state.

Alternatively, can also have current reflux path L4 instead of current reflux path L1 as shown in Figure 16.Electricity It flows back to flow path L4 and has the 2nd diode 41, the cathode side of the 2nd diode 41 is connected to the 2nd winding 12C and the 2nd switch element Current path L5 between 16, the anode-side of the 2nd diode 41 are connected to the electricity between the 3rd diode 19 and centre tap 12A Flow path L6.

In this case, can also as shown in Figure 17 ignition control circuit 30 to receive not shown engine The mode of the ignition signal IGt and Energy input signal IGw of ECU output are connected to Engine ECU.Then, ignition control circuit During 30 set the energization to the 1st winding 12B based on above-mentioned ignition signal IGt, secondary electrical is set based on Energy input signal IGw The instruction value and electric discharge that flow I2 maintain the tail end of control.

As shown in figure 18, it is same as Figure 15 to start the mode controlled for electric discharge.Moreover, after implementing electric discharge and starting control, it is real It discharges electricity and maintains control.

In a period of implementing to discharge maintenance control, controlling signal for the control of the 1st switch element 15 according to the 1st is disconnection shape State.In this state, the 2nd switch element 16 and the 3rd switch element 14 are controlled according to the 2nd control signal and the 3rd control signal For closed state, thus primary current I1 flows to the 2nd winding 12C from power supply unit 17.Then, big in the absolute value of secondary current I2 In the case where the 2nd threshold value, the 2nd switch element 16 is in an off state according to the 2nd control signal, is thus cut off from power supply Portion 17 flows to the conducting of the primary current I1 of the 2nd winding 12C.Primary current I1 is via current reflux path L4 and to the 2nd as a result, Winding 12C reflux, the electric current of the 2nd winding 12C are slowly gradually decayed, and secondary current I2 is also gradually reduced.Then, in secondary electrical In the case that the absolute value of stream I2 becomes smaller than the 1st threshold value, again according to the 2nd control signal, the 2nd switch element 16 is controlled For closed state.

In the structure of Figure 16, has the current reflux path L4 including the 2nd diode 41.It, can also be such as figure about this Has the 4th switch element 43 in the anode-side of the 2nd diode 41 like that in current reflux path L4 shown in 19.4th switch member Part 43 is thyristor, has the 4th control terminal 43G, the 4th power supply side terminal 43D and the 4th ground connection side terminal 43S. 4th switch element 43 is configured to control the 4th power supply side terminal based on the 4th control signal for being input to the 4th control terminal 43G The on-off of energization between the ground connection of 43D and the 4th side terminal 43S.4th power supply side terminal 43D of the 4th switch element 43 is connected to 4th ground connection side terminal 43S of the 41, the 4th switch element 43 of 2 diode is connected to current path L5.

Electric discharge in the structure of explanatory diagram 19 starts the mode of control.

In a period of implementation electric discharge starts control, it is disconnected that the 2nd switch element 16 and the 4th switch element 43 are controlled always Open state.On this basis, the 3rd switch element 14 and the 1st switch element 15 are controlled as closed state, thus primary current I1 The 1st winding 12B is flowed to from power supply unit 17.Then, the control of the 1st switch element 15 is disconnected into shape after the 1st stipulated time State.The conducting for flowing to the primary current I1 of the 1st winding 12B from power supply unit 17 as a result, is cut off, and is induced in secondary coil 13 High voltage, the gas-insulated breakdown in the spark gap portion of spark plug 20, thus generates spark discharge in spark plug 20.

Electric discharge in the structure of explanatory diagram 19 maintains the mode of control.

After implementing electric discharge and starting control, implements electric discharge and maintain control.Implement to discharge maintain control in a period of, by the 1 switch element 15 is in an off state always.In this state, by the 3rd switch element 14, the 2nd switch element 16 and the 4th The control of switch element 43 is closed state, and thus primary current I1 flows to the 2nd winding 12C from power supply unit 17.Then, in secondary electrical The absolute value of I2 is flowed greater than in the case where the 2nd threshold value, and the 2nd switch element 16 is in an off state, is thus cut off from power supply Portion 17 flows to the conducting of the primary current I1 of the 2nd winding 12C.Primary current I1 is via current reflux path L4 and to the 2nd as a result, Winding 12C reflux, the electric current of the 2nd winding 12C are slowly gradually decayed, and secondary current I2 is also gradually reduced.Then, in secondary electrical In the case that the absolute value of stream I2 becomes smaller than the 1st threshold value, the 2nd switch element 16 is controlled as closed state again.

By the way that the 4th switch element 43 is arranged in current reflux path L4 as shown in Figure 19, when discharging generation due to logical It crosses from the voltage that the 1st winding 12B is generated with magnetic flux that the 2nd winding 12C interlinks and flows through back flow current, be able to suppress secondary electrical Press V2 decline.

<the 2nd embodiment>

In the following, being illustrated centered on the difference of the 1st embodiment about the 2nd embodiment.

In the 1st embodiment, centre tap 12A is connected to power supply unit 17 via the 3rd switch element 14.About this, It can be set to such as flowering structure: by removing the 3rd switch element 14 that centre tap 12A is direct as recorded in Figure 20 It is connected to power supply unit 17.In addition, ignition system 10 involved in the 2nd embodiment has current reflux path L4 to replace electric current Return flow path L1.Current reflux path L4 has the 2nd diode 41, and the cathode side of the 2nd diode 41 is connected to the 2nd winding 12C Power supply unit 17 and centre tap 12A are connected to the anode-side of the current path L5 between the 3rd diode 19, the 2nd diode 41 Between current path L6.

In addition, cathode side is connected to the 2nd to the 3rd diode 19 involved in the 2nd embodiment in a same manner as in the first embodiment Switch element 16, anode-side are connected to the end of 16 side of the 2nd switch element of the 2nd winding 12C.Thereby, it is possible to inhibit discharging Electric current flows to power supply unit 17 via the 2nd winding 12C from the 2nd switch element 16 when starting control, can prevent electric discharge from starting to control Generation voltage decline.

By being set as above structure, the 3rd switch element 14 of setting is not needed, correspondingly it is possible to realize control of discharge Easy.In addition to this, additionally it is possible to seek the cost cutting of ignition system 10.In the following, illustrating that the 2nd is real referring to Figure 20 and Figure 21 Apply the mode of control of discharge involved in mode.

Based on the ignition signal IGt exported by Engine ECU, electric discharge is implemented by ignition control circuit 30 and generates control.In Electric discharge generates in control, and the 1st control signal is sent to the 1st control terminal 15G (reference time t11) of the 1st switch element 15. The 2nd switch element 16 is still off-state as a result, and the 1st switch element 15 is controlled as closed state.As a result, primary current I1 flows to the 1st winding 12B from power supply unit 17, and the primary current I1 flowed in the 1st winding 12B becomes larger.

Then, after the 1st stipulated time, the output of the 1st control signal is stopped (reference time t12).As a result, 1 switch element 15 is controlled as off-state, and the conducting for flowing to the primary current I1 of the 1st winding 12B is cut off, in secondary coil High voltage is induced in 13, generates spark discharge in spark plug 20.

Then, electric discharge is implemented by ignition control circuit 30 and maintains control.It is maintained in control in electric discharge, by ignition control circuit 30 gradually detection stream overcurrent detection use path L2 secondary current I2.The secondary current I2 detected absolute value less than In the case where 1 threshold value, the 2nd control signal is sent to the 2nd control terminal 16G (reference time t13) of the 2nd switch element 16. The 2nd switch element 16 is controlled as closed state as a result, and primary current I1 flows to the 2nd winding 12C from power supply unit 17.

In the case where the absolute value of the secondary current I2 detected is greater than 2 threshold value, the output of the 2nd control signal is stopped Only (reference time t14).The 2nd switch element 16 is controlled as off-state as a result, flows to the 2nd winding 12C's from power supply unit 17 Primary current I1 is cut off, and primary current I1 flows back via current reflux path L4 and to the 2nd winding 12C, the 2nd winding 12C's Electric current is slowly gradually decayed, and secondary current I2 is also gradually reduced.Then, in the absolute value of secondary current I2 less than the 1st threshold value In the case where, the 2nd switch element 16 is controlled as closed state again.In this way, being maintained in control period in electric discharge, control the 2nd The on-off action of switch element 16 to be greater than the 1st threshold with the absolute value of the secondary current I2 detected in the L2 of path in current detecting Value and less than the 2nd threshold value, thus until electric discharge during terminate until continue spark discharge (reference is persistently generated in spark plug 20 Time t13-15).

In this way, being switched on and off about the primary current I1 for flowing through the 1st winding 12B, it can be by first by the 2nd switch Part 16 switches the 1st switch element 15 on the basis of being in an off state to implement.In addition, about the first of the 2nd winding 12C is flowed through The conducting and reflux of grade electric current I1 can be opened by switching the 2nd on the basis of being in an off state the 1st switch element 15 Element 16 is closed to implement.

In addition, maintaining to flow in current reflux path L4 in control period in electric discharge by setting current reflux path L4 Dynamic primary current I1 flows through the 2nd winding 12C without flow through the 1st winding 12B, therefore not will receive the influence of the 1st winding 12B, Primary current I1 can be controlled with high precision.In turn, the controlling that can be improved secondary current I2, as a result, it is possible to mention For being not easy the igniter caught fire.

In addition, many structures of building ignition system 10 are accommodated in the shell 50 for containing ignition coil 11.The 2nd In embodiment, it is also formed with defined space between iron core 23 and shell 50, the 1st switch is set in the defined space Element 15, the 2nd switch element 16, current reflux path L7, current detecting path L2 and ignition control circuit 30.

I.e. it is capable to accommodate the igniting of this internal combustion engine in the space for the ignition coil 11 being accommodated in spark plug 20 System.Thereby, it is possible to cut down wiring, and it is able to suppress hugeization of this ignition system for internal combustion engines, therefore it is possible to realize mention Mountability of the height to vehicle.

Additionally it is possible to the 2nd embodiment be changed as follows to implement.

As the other examples for being applied to the 2nd embodiment, the 3rd diode 19 can also be configured to as shown in figure 22 Cathode side be connected to centre tap 12A, anode-side is connected to power supply unit 17.Thereby, it is possible to prevent accidentally by power supply unit 17 with Adverse current when reversed polarity is installed.

In the 2nd embodiment, in a period of implementing to discharge maintenance control, in the exhausted of the secondary current I2 detected To value less than the 1st threshold value in the case where the 2nd switch element 16 be controlled as closed state, in the exhausted of the secondary current I2 detected The 2nd switch element 16 is controlled as off-state in the case where being greater than the 2nd threshold value to value.It, can also be with secondary current about this The value of I2 controls the open and close control of the 2nd switch element 16 independently with the defined time.Such as control is maintained implementing to discharge During, it can also be with every open and-shut mode by switching the 2nd switch element 16 when 2 stipulated time.In this case, implementing Electric discharge maintains not needing detection secondary current I2 in a period of control, therefore does not need to form current detecting path L2, can Seek miniaturization, the cost cutting of ignition system 10.

In the 2nd embodiment, the 2nd diode 41 is provided in current reflux path L4.About this, can also answer With structure same as current reflux path L4 shown in Figure 19.Specifically, can also implement like that the 2nd as shown in figure 23 Also the anode-side of the 2nd diode 41 in current reflux path L4 has the 4th switch element 43 in mode.In this case, It can play the role of according to other shown in Figure 19 and effect.

In this case, can also as shown in figure 23, ignition control circuit 30 is to receive not shown start The mode of the ignition signal IGt and Energy input signal IGw of machine ECU output are connected to Engine ECU.Then, ignition control electricity It is secondary based on Energy input signal Igw setting during road 30 sets the energization to the 1st winding 12B based on above-mentioned ignition signal IGt The instruction value of electric current I2 and electric discharge maintain the tail end of control.In addition, ignition control circuit 30 is to control the 1st switch element 15, the mode of the on-off action of the 2nd switch element 16 and the 4th switch element 43 is connected to the 1st control terminal 15G, the 2nd control Terminal 16G and the 4th control terminal 43G.In addition it is also possible to which the 2nd diode 41 and the 4th switch element 43 are configured on the contrary.

It as shown in figure 24, will according to the 2nd control signal and the 4th control signal in a period of implementation electric discharge starts control 2nd switch element 16 and the 4th switch element 43 are in an off state.Ignition signal IGt rises on this basis, thus according to 1st control signal controls the 1st switch element 15 for closed state, and primary current I1 flows to the 1st winding 12B from power supply unit 17. Then, ignition signal IGt declines, and is in an off state the 1st switch element 15 thus according to the 1st control signal.As a result, from The conducting that power supply unit 17 flows to the primary current I1 of the 1st winding 12B is cut off, and high voltage is induced in secondary coil 13, fire The gas-insulated breakdown in the spark gap portion of flower plug 20, thus generates spark discharge in spark plug 20.

Then, after implementing electric discharge and starting control, implement electric discharge and maintain control.During implementing to discharge maintenance control It is interior, the 1st switch element 15 is in an off state according to the 1st control signal.In this state, according to the 2nd control signal and 4th control signal controls the 2nd switch element 16 and the 4th switch element 43 for closed state, and thus primary current I1 is from power supply Portion 17 flows to the 2nd winding 12C.Then, in the case where the absolute value of secondary current I2 is greater than 2 threshold value, believed according to the 2nd control Number the 2nd switch element 16 is in an off state, thus cuts off the primary current I1 for flowing to the 2nd winding 12C from power supply unit 17 Conducting.Primary current I1 flows back via current reflux path L4 and to the 2nd winding 12C as a result, and the electric current of the 2nd winding 12C is slow Slowly gradually decay, secondary current I2 is also gradually reduced.Then, the 1st threshold value is become smaller than in the absolute value of secondary current I2 In the case of, again according to the 2nd control signal, the 2nd switch element 16 is controlled as closed state.

Also the position of the 3rd diode 19 position shown in Figure 23 can be changed to position shown in Figure 25.That is, the Cathode side is connected to the 2nd switch element 16 to 3 diodes 19 in a same manner as in the first embodiment, and anode-side is connected to the 2nd winding 12C 16 side of the 2nd switch element end.In addition it is also possible to which the 3rd diode 19 is configured on the contrary with the 2nd switch element 16.

<the 3rd embodiment>

In the following, being illustrated centered on the difference of the 2nd above-mentioned embodiment about the 3rd embodiment.

In the 2nd embodiment, the 2nd power supply side terminal 16D of the 2nd switch element 16 is connected to via the 3rd diode 19 2nd winding 12C, the 2nd ground connection side terminal 16S are grounded.For this point, as recorded in Figure 26, remove the 2nd switch member Part 16, additional 3rd switch element 14.3rd power supply side terminal 14D of the 3rd switch element 14 is connected to centre tap 12A, and the 3rd 3rd ground connection side terminal 14S of switch element 14 is connected to the 2nd winding 12C.Moreover, current reflux path L7 have the 4th two The cathode side of pole pipe 42 is connected to the current path L8 between the 3rd switch element 14 and the 2nd winding 12C, the sun of the 4th diode 42 Pole side is grounded.Maintained in control period in electric discharge as a result, the primary current I1 that is flowed in current reflux path L7 without flow through 1st winding 12B and directly flow through the 2nd winding 12C, therefore not will receive the influence of the 1st winding 12B, can control with high precision Primary current I1.

The cathode side of 3rd diode 19 is connected to ground side, and the anode-side of the 3rd diode 19 is connected to the 2nd winding 12C's With the end of the side centre tap 12A opposite side.Thereby, it is possible to inhibit when electric discharge starts control electric current from the 2nd switch element 16 Power supply unit 17 is flowed to via the 2nd winding 12C, can prevent electric discharge from starting the decline of the generation voltage of control.

Illustrate the mode of control of discharge involved in present embodiment referring to Figure 26 and Figure 27.

Based on the ignition signal IGt exported by Engine ECU, electric discharge is implemented by ignition control circuit 30 and generates control.In Electric discharge generates in control, and the 1st control signal is sent to the 1st control terminal 15G (reference time t21) of the 1st switch element 15. The 3rd switch element 14 is still off-state as a result, and the 1st switch element 15 is controlled as closed state.As a result, primary current I1 flows to the 1st winding 12B from power supply unit 17, and the primary current I1 flowed in the 1st winding 12B becomes larger.

Then, after the 1st stipulated time, the output of the 1st control signal is stopped (reference time t22).As a result, 1 switch element 15 is controlled as off-state, and the conducting for flowing to the primary current I1 of the 1st winding 12B is cut off, in secondary coil High voltage is induced in 13, generates spark discharge in spark plug 20.

Then, electric discharge is implemented by ignition control circuit 30 and maintains control.It is maintained in control in electric discharge, by ignition control circuit 30 gradually detect to flow through the secondary current I2 of current detecting path L2.It is less than in the absolute value of the secondary current I2 detected In the case where 1st threshold value, the 3rd control signal is sent to the 3rd control terminal 14G (reference time of the 3rd switch element 14 t23).The 3rd switch element 14 is controlled as closed state as a result, and primary current I1 flows to the 2nd winding 12C from power supply unit 17.

In the case where the absolute value of the secondary current I2 detected is greater than 2 threshold value, the output of the 3rd control signal is stopped Only (reference time t24).The 3rd switch element 14 is controlled as off-state as a result, flows to the 2nd winding 12C's from power supply unit 17 Primary current I1 is cut off, and primary current I1 flows back to the 2nd winding 12C and decayed via current reflux path L7.Hereafter, it controls The on-off action for making the 3rd switch element 14 to be greater than in current detecting with the absolute value of the secondary current I2 detected in the L2 of path 1st threshold value and continue persistently to generate spark discharge (ginseng in spark plug 20 less than the 2nd threshold value, until end during electric discharge According to time t23-25).

In this way, being switched on and off about the primary current I1 for flowing through the 1st winding 12B, it can be by first by the 3rd switch Part 14 switches the 1st switch element 15 on the basis of being in an off state to implement.In addition, about the first of the 2nd winding 12C is flowed through The conducting and reflux of grade electric current I1 can be opened by switching the 3rd on the basis of being in an off state the 1st switch element 15 Element 14 is closed to implement.In addition, in said structure, being eliminated from from power supply unit 17 into the electrical path of centre tap 12A 3rd switch element 14.Therefore, it can eliminate when primary current I1 flows to the 1st winding 12B from power supply unit 17 due to via the 3rd Switch element 14 and generate loss, can be improved electric discharge generate control efficiency.

In addition, many structures of building ignition system 10 are accommodated in the shell 50 for containing ignition coil 11.The 3rd In embodiment, it is also formed with defined space between iron core 23 and shell 50, is provided with the 1st in the defined space and opens Close element 15, the 3rd switch element 14, current reflux path L7, current detecting path L2 and ignition control circuit 30.

I.e. it is capable to accommodate the igniting of this internal combustion engine in the space for the ignition coil 11 being accommodated in spark plug 20 System.Thereby, it is possible to cut down wiring, and it is able to suppress hugeization of this ignition system for internal combustion engines, therefore it is possible to realize mention Mountability of the height to vehicle.

3rd embodiment can also be changed as follows to implement.

In the 3rd embodiment, the cathode side of the 3rd diode 19 is connected to ground side, the anode-side of the 3rd diode 19 It is connected to the end with the side centre tap 12A opposite side of the 2nd winding 12C.About this, may be configured as follows: such as Figure 28 Shown, the cathode side of the 3rd diode 19 is connected to the end of the side centre tap 12A of the 2nd winding 12C, the sun of the 3rd diode 19 Pole side is connected to the 3rd switch element 14.

In this case, as shown in figure 29, ignition control circuit 30 is to receive not shown Engine ECU output The mode of ignition signal IGt and Energy input signal IGw are connected to Engine ECU.Then, ignition control circuit 30 is based on above-mentioned During ignition signal IGt sets the energization to the 1st winding 12B, the instruction based on Energy input signal IGw setting secondary current I2 Value and electric discharge maintain the tail end of control.In addition, ignition control circuit 30 is with the on-off action of the 3rd switch element 14 of control Mode is connected to the 3rd control terminal 14G.In addition it is also possible to which the 3rd diode 19 is configured on the contrary with the 3rd switch element 14.

As shown in figure 30, in a period of implementation electric discharge starts control, signal is controlled by the 3rd switch element 14 according to the 3rd It is in an off state.Ignition signal IGt rises on this basis, controls the 1st switch element 15 thus according to the 1st control signal It is made as closed state, primary current I1 flows to the 1st winding 12B from power supply unit 17.Then, ignition signal IGt declines, thus according to 1st switch element 15 is in an off state by the 1st control signal.The primary of the 1st winding 12B is flowed to from power supply unit 17 as a result, The conducting of electric current I1 is cut off, and high voltage, the gas-insulated in the spark gap portion of spark plug 20 are induced in secondary coil 13 Breakdown, thus generates spark discharge in spark plug 20.

Then, after implementing electric discharge and starting control, implement electric discharge and maintain control.During implementing to discharge maintenance control It is interior, the 1st switch element 15 is in an off state according to the 1st control signal.It in this state, will according to the 3rd control signal The control of 3rd switch element 14 is closed state, and thus primary current I1 flows to the 2nd winding 12C from power supply unit 17.Then, secondary In the case that the absolute value of grade electric current I2 is greater than the 2nd threshold value, the control of the 3rd switch element 14 is disconnected according to the 3rd control signal Thus state cuts off the conducting that the primary current I1 of the 2nd winding 12C is flowed to from power supply unit 17.Primary current I1 is via electricity as a result, Flow back to flow path L7 and flow back to the 2nd winding 12C, the electric current of the 2nd winding 12C is slowly gradually decayed, secondary current I2 also by Gradually decline.Then, in the case where the absolute value of secondary current I2 becomes smaller than 1 threshold value, again according to the 3rd control signal 3rd switch element 14 is controlled as closed state.

In the 3rd embodiment, in a period of implementing to discharge maintenance control, in the exhausted of the secondary current I2 detected To value less than the 1st threshold value in the case where the 3rd switch element 14 be controlled as closed state, in the exhausted of the secondary current I2 detected The 3rd switch element 14 is controlled as off-state in the case where being greater than the 2nd threshold value to value.It, can also be with secondary current about this The value of I2 controls the open and close control of the 3rd switch element 14 independently with the defined time.Such as control is maintained implementing to discharge During, it can also be with every open and-shut mode by switching the 3rd switch element 14 when 2 stipulated time.In this case, implementing Electric discharge maintains not needing detection secondary current I2 in a period of control, therefore does not need to form current detecting path L2, can Seek miniaturization, the cost cutting of ignition system 10.

The electric discharge involved in the 3rd embodiment generates in control, and implement control as follows: the 3rd switch element 14 is still For off-state, the 1st switch element 15 is controlled as closed state, after the 1st stipulated time, 15 quilt of the 1st switch element It is in an off state.

It for this point, also can be set to such as flowering structure: when electric discharge generates control, being by the control of the 1st switch element 15 Thus closed state makes primary current I1 flow to the 1st winding 12B from power supply unit 17, on the other hand, the 3rd switch element 14 is controlled It is made as closed state.Primary current I1 also flows through the 2nd winding 12C as a result, as a result, in the 1st winding 12B and the 2nd winding 12C The magnetic flux in the middle direction for generating the mutual magnetic flux that offsets each other respectively.As recording as in Fig. 31 as a result, due to implementing to discharge Generate control and the secondary voltage V2 that generates can also be reduced and be generated control and what is generated so-called leads due to implementing previous electric discharge Be powered pressure.In turn, can reduce the voltage for being applied to and preventing diode 21, can be set as preventing the low pressure resistanceization of diode 21 or The structure for preventing diode 21 is eliminated, it is possible to realize the cost cutting of ignition system 10.

Additionally it is possible to be changed the respective embodiments described above as follows to implement.

In the respective embodiments described above, the signal wire of ignition signal IGt is transmitted to ignition coil 11 and transmitting energy is thrown The signal wire for entering signal IGw is separately to connect to come out from Engine ECU (not shown).It in contrast, can also be as The shared signal wire 51 for transmitting Energy input signal IGw is connected to Engine ECU 61 as shown in Figure 32, and (control fills It sets).Furthermore, it is also possible to which the signal wire 51a~51d branched out from signal wire 51 to be connected to the ignition control circuit of each cylinder 30.That is, Energy input signal IGw can also be shared in whole cylinder #1~#4.In addition, ignition signal IGt is and each cylinder Corresponding individual signal.

As shown in Figure 12~15,18,24,30, such as from ignition signal between the high period of Energy input signal IGw IGt continues to the period that electric discharge maintains control to terminate during being high level.It therefore, is multiple cylinder engine in engine 60 In the case where (such as 6 cylinder engine of V-type), as shown in figure 33, when Energy input signal IGw is shared, Energy input letter Number IGw is possible to be always high level.That is, in the continuous cylinder of igniting using spark plug 20, it is possible to Energy input letter It is overlapped between the high period of number IGw.

Accordingly it is also possible to which shared signal wire 52 and the transmitting of Energy input signal IGw1 will be transmitted like that as shown in figure 34 The shared signal wire 53 of Energy input signal IGw2 is connected to Engine ECU 61.That is, Energy input signal IGw1 can also be It is shared in a part of cylinder #1, #3, #5 (side arranges (Bank)).Energy input signal IGw2 can also be in a part of cylinder #2, # 4, it is shared in #6 (other side column).In addition, ignition signal IGt becomes individual signal corresponding with each cylinder.

Furthermore, it is also possible to which the signal wire 52a~52c branched out from signal wire 52 (the 1st shared signal wire) is separately connected In the ignition control circuit 30 of the 1st cylinder #1, the 3rd cylinder #3, the 5th cylinder #5.1st cylinder #1, the 3rd cylinder #3, the 5th cylinder #5 (the 1st air cylinder group) is the set using the discontinuous cylinder of igniting of spark plug 20.Alternatively, it is also possible to will be from signal wire 53 the (the 2nd Sharing signal wire) signal wire 53a~53c for branching out is connected to the point of the 2nd cylinder #2, the 4th cylinder #4, the 6th cylinder #6 Fiery control circuit 30.2nd cylinder #2, the 4th cylinder #4, the 6th cylinder #6 (the 2nd air cylinder group) are not connected using the igniting of spark plug 20 The set of continuous cylinder, and be the combination for not including cylinder in the 1st air cylinder group.That is, include in the 1st air cylinder group 2 During a cylinder (such as the 1st cylinder #1, the 3rd cylinder #3) is successively lighted a fire, including 1 gas in the 2nd air cylinder group Cylinder (such as the 2nd cylinder #2) is lighted a fire.

According to this structure, as shown in figure 35, can be avoided Energy input signal IGw1, IGw2 is always high level. That is, the 1st cylinder #1 of the 1st air cylinder group, the 3rd cylinder #3, the igniting of the 5th cylinder #5 are discontinuous, it is able to suppress and is passed to the 1st gas It overlaps each other between 1st cylinder #1 of cylinder group, the high period of the Energy input signal IGw1 of the 3rd cylinder #3, the 5th cylinder #5.Separately Outside, the 2nd cylinder #2, the 4th cylinder #4 of the 2nd air cylinder group, the igniting of the 6th cylinder #6 are discontinuous, are able to suppress and are passed to the 2nd gas It overlaps each other between 2nd cylinder #2 of cylinder group, the high period of the Energy input signal IGw2 of the 4th cylinder #4, the 6th cylinder #6.Cause And even if engine 60 is multiple cylinder engine, secondary current I2 can be also set based on Energy input signal IGw1, IGw2 Instruction value and electric discharge maintain control tail end.

In addition, engine 60 is not limited to 6 cylinder engines, it is also possible to 8 cylinder engines, 10 cylinder engines etc..Separately Outside, the cylinder of engine 60 can also be divided into 3 or more air cylinder groups.Moreover, the cylinder of each air cylinder group is to utilize spark plug The set of the 20 discontinuous cylinder of igniting.Specifically, include in each air cylinder group (such as the 1st air cylinder group) 2 It include that cylinder in other air cylinder groups (such as the 2nd air cylinder group) is lighted a fire i.e. during a cylinder is successively lighted a fire It can.

Energy input is being carried out using 1 signal wire of transmitting ignition signal IGt as Fig. 1,16,19,20,26 In the case where control, additionally it is possible to the letter that will include in above-mentioned ignition signal IGt and above-mentioned Energy input signal IGw as shown in figure 36 Breath is only superimposed upon in ignition signal IGt.That is, rising to come with the first time of ignition signal IGt after starting electric discharge and starting control Start the energization to the 1st winding 12B according to the 1st control signal, is risen with second to terminate the energization to the 1st winding 12B.So Afterwards, control is maintained to terminate electric discharge with second of the decline of ignition signal IGt.

Specifically, as shown in figure 37, ignition control circuit 30 has signal message and divides circuit 30a, the 1st control unit 30b, energy supposition control unit 30c, the 2nd control unit 30d, the 4th control unit 30e etc..Signal message divides circuit 30a detection igniting The upward period and downward period of signal IGt counts rise times and decline number.The control of 1st control unit 30b and the 4th Portion 30e processed makes the 1st control signal and the 4th control signal based on the information of circuit 30a is divided from signal message respectively.Energy Amount superposing control portion 30c and the 2nd control unit 30d is based on the secondary for dividing the information of circuit 30a from signal message and detecting Electric current I2 controls signal to make the 2nd.It in detail, can be using structure documented by No. 4736942 bulletins of Japanese Patent No.. In addition, the finger of setting and secondary current I2 during the energization to the 1st winding 12B carried out based on above-mentioned ignition signal IGt The modification for enabling value and electric discharge that the setting of the tail end of control is maintained to can also apply to other embodiment and they.

In the respective embodiments described above, it is contemplated to switch element (the 3rd switch element 14, the 2nd switch element of MOSFET 16) IGBT, power transistor, thyristor, bidirectional triode thyristor (TRIAC) etc. can be used also to replace MOSFET.Similarly, if Think that MOSFET, power transistor, thyristor, two-way controllable also can be used in the switch element (the 1st switch element 15) of IGBT Silicon etc..

It in the respective embodiments described above, can also be by the 5th diode 15D (with void in Fig. 1 for the 1st switch element 15 Line illustrates) inverse parallel connection.If implementing electric discharge in the state that current reflux path L1 is not present in the 1st embodiment In the case where maintaining control, the primary current I1 for flowing to the 2nd winding 12C is connected to the 5th of the 1st switch element 15 via inverse parallel Diode 15D and the 1st winding 12B, the current reflux of the 2nd switch element 16 is flowed to from the 2nd winding 12C.In this case, it flows back Electric current due to being influenced by the 1st winding 12B and the size of its electric current becomes smaller, the secondary generated in secondary coil 13 therewith Electric current I2 becomes smaller etc., and there are the worries of its controlling decline.For this point, by the way that current reflux path L1 is arranged, tieed up in electric discharge Electric current in control is held to flow back via current reflux path L1 to the 2nd winding 12C.Thereby, it is possible to inhibit to flow through the secondary of spark plug 20 Grade electric current I2 becomes smaller, therefore for the 5th diode 15D inverse parallel is connected to the structure of the 1st switch element 15, this igniting System 10 can be described as preferred structure.

In the respective embodiments described above, electric discharge maintenance voltage is set in the range of 2~3kV.About this, such as The maintenance voltage that can will be discharged according to the combustion state of engine 60 is set greater than the value of 3kV or less than the value of 2kV.

In the 1st embodiment and the 2nd embodiment, it is provided with cathode side and is connected to the 2nd switch element 16 and anode Side is connected to the 3rd diode 19 of the end of 16 side of the 2nd switch element of the 2nd winding 12C.In addition, in the 3rd embodiment, It is provided with that cathode side is connected to ground side and anode-side is connected to the end with the side centre tap 12A opposite side of the 2nd winding 12C 3rd diode 19 in portion.About this, the structure for being not provided with the 3rd diode 19 also can be set to, make the 2nd switch element the 16, the 3rd Switch element 14 has the element (diode) that function is prevented with adverse current.

In the respective embodiments described above, ignition control circuit 30 is based on the ignition signal IGt received from Engine ECU It generates each control signal and is controlled, but not limited to this, the arbitrary control in each control signal can also be believed It number is individually controlled from Engine ECU reception.

In the respective embodiments described above, the igniting other than power supply unit 17, spark plug 20 has been accommodated in shell 50 System 10.About this, the structure for the ignition system 10 being contained in shell 50 can also be reduced.Such as it also can be set to following knot Structure: removing ignition control circuit 30, and the Engine ECU for the outside for being present in shell 50 is made to implement to be implemented by ignition control circuit 30 Control.In this case, Engine ECU is equivalent to ignition control circuit.

In the respective embodiments described above, illustrate that the example that diode is arranged in current reflux path (is equivalent to the 1st The 1st diode 18 of current reflux path L1 in embodiment etc.), but not limited to this, such as also can be set and partly lead Body switch element implements the open and close control that is closed when reflux acts.

The disclosure is described according to embodiment, it should be understood that the disclosure is not limited to the embodiment, construction.The disclosure It further include various modifications example, the deformation in equivalency range.In addition to this, various combinations, mode and in these combinations, in mode Only the scope of the disclosure, thought range are also included within comprising an element or its above or its other combination below, mode It is interior.