阅读说明：本技术 一种用于活塞冷却喷嘴的主动保护方法和系统 (Active protection method and system for piston cooling nozzle ) 是由 杜大瑞 龙立 孙鹏远 李家玲 邹铁 高天宇 于 2020-06-24 设计创作，主要内容包括：本发明公开了一种用于活塞冷却喷嘴的主动保护方法和系统,属于发动机技术领域。所述主动保护方法包括以下步骤：获取当前发动机活塞冷却喷嘴的开启状态,若所述活塞冷却喷嘴开启,且连续开启时长大于第一设定值,则进行下一步骤；强制关闭所述活塞冷却喷嘴,关闭时长由发动机MAP图获取,所述发动机MAP图为预先制定的根据发动机的转速信息和近5个发动机工作循环内汽缸内平均有效压力值确定活塞冷却喷嘴关闭时长的图表。本发明通过对活塞冷却喷嘴采用间歇工作的方式,实现对活塞冷却喷嘴的主动保护,提高活塞冷却喷嘴的使用寿命。(The invention discloses an active protection method and system for a piston cooling nozzle, and belongs to the technical field of engines. The active protection method comprises the following steps: acquiring the opening state of a piston cooling nozzle of the current engine, and if the piston cooling nozzle is opened and the continuous opening time is longer than a first set value, performing the next step; and forcibly closing the piston cooling nozzle, wherein the closing time duration is obtained by an engine MAP (MAP of the engine), and the engine MAP is a preset chart for determining the closing time duration of the piston cooling nozzle according to the rotating speed information of the engine and the average effective pressure value in the cylinder in 5 engine working cycles. According to the invention, the piston cooling nozzle is actively protected by adopting an intermittent working mode, and the service life of the piston cooling nozzle is prolonged.)

1. A method of active protection for a piston cooling nozzle, comprising the steps of:

acquiring the opening state of a piston cooling nozzle (300) of the current engine, and if the piston cooling nozzle (300) is opened and the continuous opening time is longer than a first set value, performing the next step;

and forcibly closing the piston cooling nozzle (300), wherein the closing time period is obtained by an engine MAP (MAP) which is a preset chart for determining the closing time period of the piston cooling nozzle according to the rotating speed information of the engine and the average effective pressure value in the cylinder in 5 working cycles of the engine.

2. The active protection method of claim 1, further comprising the steps of:

obtaining a current engine oil pressure value, and if the engine oil pressure value is greater than a second set value, keeping the piston cooling nozzle (300) open until the engine oil pressure value is less than a third set value;

the second set value is a threshold value for considering that a pressure relief fault exists in the current engine oil pipeline, and the third set value is a threshold value for considering that a pressure relief fault does not exist in the current engine oil pipeline any more.

3. The active protection method of claim 1, further comprising the steps of:

and acquiring whether the current engine has a knocking tendency, and if so, keeping the piston cooling nozzle (300) open until the knocking tendency does not exist any more.

4. The active protection method of claim 3,

if the knocking tendency exists, prolonging the opening time of the piston cooling nozzle (300), wherein the prolonged time is a fourth set value;

after the opening duration of the piston cooling nozzle (300) is prolonged by a fourth set value, acquiring whether the current engine has a knocking tendency again, and if the current engine does not have the knocking tendency, continuing the next step; if a tendency to knock still exists, the opening time of the piston cooling nozzle (300) is continued to be prolonged until the tendency to knock disappears.

5. An active protection system for a piston cooling nozzle, comprising:

a piston cooling nozzle (300);

a detection unit (100) for detecting the open state of the piston cooling nozzle (300) and the state information of the engine;

and the control unit (200) is used for receiving the detection signal of the detection unit (100) and controlling the piston cooling nozzle (300) to act according to the detection signal.

6. The active protection system according to claim 5, characterized in that the control action of the control unit (200) on the piston cooling nozzle (300) comprises the control of the opening or closing of the piston cooling nozzle (300) and the control of the duration of the closing of the piston cooling nozzle (300).

7. Active protection system according to claim 5, characterized in that the detection unit (100) comprises a first unit (101), the first unit (101) being adapted to obtain the current engine piston cooling nozzle (300) opening status.

8. The active protection system according to claim 5, characterized in that the detection unit (100) further comprises a second unit (102), the second unit (102) being configured to obtain a current engine oil pressure value.

9. Active protection system according to claim 5, characterized in that the detection unit (100) further comprises a third unit (103), the third unit (103) being configured to obtain a knock tendency of the current engine.

10. Active protection system according to claim 5, characterized in that said detection unit (100) further comprises a fourth unit (104), said fourth unit (104) being adapted to obtain the current engine speed and the mean effective pressure value in the cylinder over the last five working cycles.

Technical Field

The invention relates to the technical field of engines, in particular to an active protection method and system for a piston cooling nozzle.

Background

When the engine works, because the mixed gas burns and friction between the piston and the cylinder wall causes the piston to generate a large amount of heat, cooling oil needs to be sprayed to the piston through the piston cooling nozzle to cool and lubricate the piston. The opening of the piston cooling nozzle is controlled by an electromagnetic valve; the existing control aiming at the piston cooling nozzle neglects the protection of the piston cooling nozzle and an electromagnetic valve thereof; if the piston cooling nozzle is in an open state for a long time, the coil can be burnt due to overhigh temperature of the electromagnetic valve, and the service lives of the piston cooling nozzle and the electromagnetic valve are shortened.

Therefore, in order to prolong the service life of the piston cooling nozzle and the solenoid valve thereof, it is necessary to provide an active protection method and system for the piston cooling nozzle.

Disclosure of Invention

The invention provides an active protection method and system for a piston cooling nozzle, which not only meet the normal requirement of an engine on piston cooling, but also actively protect the piston cooling nozzle, and prolong the service life of the piston cooling nozzle and an electromagnetic valve thereof.

In order to realize the purpose, the following technical scheme is provided:

a method of active protection for a piston cooling nozzle comprising the steps of:

acquiring the opening state of a piston cooling nozzle of the current engine, and if the piston cooling nozzle is opened and the continuous opening time is longer than a first set value, performing the next step;

and forcibly closing the piston cooling nozzle, wherein the closing time duration is obtained by an engine MAP (MAP of the engine), and the engine MAP is a preset chart for determining the closing time duration of the piston cooling nozzle according to the rotating speed information of the engine and the average effective pressure value in the cylinder in 5 engine working cycles.

As a preferred embodiment of the above active protection method, the method further includes the following steps:

obtaining a current engine oil pressure value, and if the engine oil pressure value is greater than a second set value, keeping the piston cooling nozzle open until the engine oil pressure value is less than a third set value;

the second set value is a threshold value for considering that a pressure relief fault exists in the current engine oil pipeline, and the third set value is a threshold value for considering that a pressure relief fault does not exist in the current engine oil pipeline any more.

As a preferred embodiment of the above active protection method, the method further includes the following steps:

and acquiring whether the current engine has a knocking tendency, and if so, keeping the piston cooling nozzle open until the knocking tendency does not exist any more.

As a preferred embodiment of the above-mentioned active protection method,

if the knocking tendency exists, prolonging the opening time of the piston cooling nozzle, wherein the prolonged time is a fourth set value;

after the opening duration of the piston cooling nozzle is prolonged by a fourth set value, whether the current engine has a knocking tendency or not is obtained again, and if the current engine does not have the knocking tendency, the next step is continued; if the detonation tendency still exists, the opening time of the piston cooling nozzle is continuously prolonged until the detonation tendency disappears.

An active protection system for a piston cooling nozzle, comprising:

a piston cooling nozzle;

the detection unit is used for detecting the opening state of the piston cooling nozzle and the state information of the engine;

and the control unit is used for receiving the detection signal of the detection unit and controlling the piston cooling nozzle to act according to the detection signal.

As a preferred embodiment of the above active protection system, the control action of the control unit on the piston cooling nozzle includes control on opening or closing of the piston cooling nozzle and control on the closing time period of the piston cooling nozzle.

As a preferred embodiment of the above active protection system, the detection unit includes a first unit for acquiring a current opening state of the piston cooling nozzle of the engine.

As a preferred embodiment of the above active protection system, the detection unit further includes a second unit, and the second unit is configured to obtain a current oil pressure value of the engine.

As a preferred embodiment of the above active protection system, the detection unit further includes a third unit, and the third unit is configured to acquire a knocking tendency of the current engine.

As a preferred embodiment of the above active protection system, the detection unit further includes a fourth unit, and the fourth unit is configured to obtain the current engine speed and the average effective pressure value in the cylinder in approximately five working cycles.

The invention provides an active protection method and system for a piston cooling nozzle, which realize active protection for the piston cooling nozzle by enabling the piston cooling nozzle to adopt an intermittent working mode, namely forcibly closing the piston cooling nozzle for a certain time when the continuous opening time of the piston cooling nozzle exceeds a set value; the piston cooling nozzle can meet the normal cooling work requirement of the piston cooling nozzle, and can be actively protected, so that the phenomenon that the temperature of the electromagnetic valve is too high to burn a coil and the service life is reduced due to the fact that the electromagnetic valve is in an open state for a long time is avoided; furthermore, the intermittent operation of the piston cooling nozzle also enables a reduction in oil consumption to some extent.

Drawings

FIG. 1 is a control flow diagram of a method for active protection of a piston cooling nozzle in an embodiment of the present invention;

FIG. 2 is a block diagram of an active protection system for a piston cooling nozzle in an embodiment of the present invention.

In the figure:

100-a detection unit; 101-a first cell; 102-a second unit; 103-a third unit; 104-a fourth unit; 200-a control unit; 300-piston cooling nozzle.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Referring to fig. 1, the present embodiment is directed to providing an active protection method for a piston cooling nozzle, comprising the steps of:

s100: acquiring the opening state of the piston cooling nozzle 300 of the current engine, and if the piston cooling nozzle 300 is opened and the continuous opening time is longer than a first set value, performing the next step;

s200: the piston cooling nozzle 300 is forcibly closed, and the closing time period is obtained from an engine MAP, which is a preset chart for determining the closing time period of the piston cooling nozzle according to the rotating speed information of the engine and the average effective pressure value in the cylinder in 5 working cycles of the engine. The MAP of the engine is obtained by calibration of a bench test of the engine.

The setting purpose of the step S100 is to determine whether to enter the active protection process of the piston cooling nozzle 300 according to the opening state and the continuous operating time of the piston cooling nozzle 300; if the active protection condition of the piston cooling nozzle 300 is satisfied (i.e., the piston cooling nozzle 300 is opened for a period greater than the first set value), an active protection procedure is performed. Wherein the first set value is a calibration value determined according to the actual working state of the engine.

Further, between step S100 and step S200, the active protection method for the piston cooling nozzle 300 further includes the following steps:

s11: obtaining a current engine oil pressure value, and if the engine oil pressure value is greater than a second set value, keeping the piston cooling nozzle 300 open until the engine oil pressure value is less than a third set value; proceed to the next step. The second set value is a threshold value for considering that the current engine oil pipeline has a pressure relief fault, and the third set value is a threshold value for considering that the current engine oil pipeline does not have the pressure relief fault any more.

The step S11 is provided to detect whether there is a pressure relief fault in the entire engine oil line in the case where the condition for the piston cooling nozzle 300 to enter the active protection process is satisfied. Because the piston cooling nozzle 300 is located in a cooling system of an engine, if a pressure relief fault occurs in the whole engine oil pipeline, the pressure in the cavity of the piston cooling nozzle 300 is too high, and the piston cooling nozzle 300 and the engine oil pipeline are damaged, so that once the current engine oil pressure value exceeds a second set value, the piston cooling nozzle 300 needs to be kept in an open state until the engine oil pressure value is lower than a third set value, and the pressure relief risk does not exist any more. In this embodiment, the second setting value and the third setting value are calibration data determined according to the actual operating state of the engine.

Further, between step S100 and step S200, there is further included the step of:

s12: acquiring whether the current engine has a knocking tendency, if so, keeping the piston cooling nozzle 300 open until the knocking tendency does not exist any more; proceed to the next step.

Further, step S12 further includes the following specific steps:

s121: if the knocking tendency exists, prolonging the opening time of the piston cooling nozzle 300, wherein the prolonged time is a fourth set value;

s122: after the opening duration of the piston cooling nozzle 300 is prolonged by a fourth set value, acquiring whether the current engine has a knocking tendency again, and if the current engine does not have the knocking tendency, continuing the next step; if there is still a tendency to knock, step S121 is repeated, i.e., the opening period of the piston cooling nozzle 300 is continued to be extended until the tendency to knock disappears.

Wherein the fourth setting value is a calibration value that is also determined based on the actual operating state of the engine.

The purpose of step S12 is to ensure that the piston cooling nozzle 300 continues to operate when the engine has a knocking tendency, and to continuously cool the piston, thereby reducing the knocking tendency.

By arranging the steps S11 and S12 between the step S100 and the step S200, the active protection method of the piston cooling nozzle 300 is established on the premise that the current engine oil pipeline has no pressure relief fault risk and the current engine has no knocking tendency; namely, the active protection of the piston cooling nozzle 300 is implemented, and the forced closing and intermittent operation of the piston cooling nozzle 300 are performed on the premise of ensuring the safe operation of the engine.

In one embodiment, step S11 may be performed before step S12, i.e., the engine oil line is ensured not to have a pressure relief risk, and then the engine knocking tendency is detected. Of course, in some other embodiments, step S12 may be set before step S11, that is, the engine knocking tendency is detected first, and when it is ensured that there is no engine knocking tendency, the pressure relief risk of the oil pipeline is detected; the order of the two steps is not particularly limited, so long as the engine is not prone to knock and risk of pressure relief prior to active protection of the piston cooling nozzle 300.

Referring to fig. 2, the present embodiment further provides an active protection system for a piston cooling nozzle, specifically including:

the piston cooling nozzle 300;

a detection unit 100 for detecting an open state of the piston cooling nozzle 300 and state information of the engine;

and a control unit 200 for receiving the detection signal from the detection unit 100 and controlling the piston cooling nozzle 300 to operate according to the detection signal.

Further, the control action of the control unit 200 on the piston cooling nozzle 300 includes control on opening or closing of the piston cooling nozzle 300 and control on the time period for which the piston cooling nozzle 300 is closed.

Further, the detection unit 100 comprises a first unit 101, and the first unit 101 is configured to acquire a current opening state of the engine piston cooling nozzle 300. The detection unit 100 further includes a second unit 102, and the second unit 102 is configured to obtain the current oil pressure value of the engine in step S11. The detection unit 100 further includes a third unit 103, and the third unit 103 is configured to acquire the knocking tendency of the current engine in step S12. The detection unit 100 further includes a fourth unit 104, and the fourth unit 104 is configured to obtain the current engine speed and the cylinder average effective pressure value in the last five working cycles, so as to obtain the closing time period required for the current piston cooling nozzle 300 by referring to a calibrated engine MAP in step S200.

According to the active protection method and system for the piston cooling nozzle 300 provided by the embodiment, the piston cooling nozzle 300 is actively protected by adopting an intermittent working mode for the piston cooling nozzle 300, that is, when the continuous opening time of the piston cooling nozzle 300 exceeds a set value, the piston cooling nozzle 300 is forcibly closed for a certain time; the cooling device can meet the normal cooling work requirement of the piston cooling nozzle 300, and can actively protect the piston cooling nozzle 300, so that the phenomenon that the temperature of the electromagnetic valve is too high to burn a coil and the service life is reduced due to the fact that the electromagnetic valve is in an open state for a long time is avoided; furthermore, the intermittent operation of the piston cooling nozzle 300 also enables oil consumption to be reduced to some extent.

In the above embodiment, each included unit and module is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.

It should be understood by those skilled in the art that the present embodiment is only for explaining the technical principle of the present invention, and is not intended to limit the scope of the present invention. The present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Those skilled in the art can adjust the solution according to the needs to adapt to the specific application, and the adjusted solution still falls into the protection scope of the present invention. Therefore, although the present invention has been described in more detail by the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the spirit of the present invention.