阅读说明：本技术 起动机控制方法及继电器诊断方法 (Starter control method and relay diagnosis method ) 是由 申付松 刘勤 范宁生 张辰燕 于 2018-07-10 设计创作，主要内容包括：本发明提供了一种起动机控制方法及继电器诊断方法,使用本发明提供的起动机控制方法避免了第二继电器不必要的吸合,减少了其发热老化的概率,延长了该继电器的使用寿命,同时使用本发明提供的继电器诊断方法,可以及时诊断出第一和第二继电器开路、粘连等故障,有效解决了之前诊断方案无法报出第一继电器粘连故障等问题,有利于售后维修,也避免了安全隐患。(The starter control method provided by the invention avoids unnecessary actuation of the second relay, reduces the probability of heating and aging of the second relay, prolongs the service life of the relay, can diagnose the faults of open circuit, adhesion and the like of the first relay and the second relay in time by using the relay diagnosis method provided by the invention, effectively solves the problems that the adhesion fault and the like of the first relay cannot be reported by the previous diagnosis scheme, is beneficial to after-sale maintenance and also avoids potential safety hazards.)

1. A starter control method characterized by comprising the steps of:

the electronic control unit sends a first attraction request and a second attraction request;

a first relay receives a first attraction request sent by the electronic control unit, and the first relay attracts;

the second relay receives a second pull-in request sent by the electronic control unit, and the second relay pulls in when the disconnection of the transmission chain is detected;

the starter is connected with a power supply and starts to drag the engine;

after the engine start is completed, the first relay and the second relay are turned off to terminate the drag.

2. The relay control method according to claim 1, wherein a high end of the first relay and a high end of the second relay are connected to a main relay, and a low end of the first relay and a low end of the second relay are controlled by the electronic control unit.

3. The relay control method according to claim 1, wherein the low-end control signal of the second relay comprises a transmission chain state, denoted as B _ ptlck, sent by an automatic transmission control unit, and when B _ ptlck is False, the transmission chain state is off.

4. A relay diagnosis method is characterized by comprising the following steps:

after the electronic control unit sends out a first pull-in request and a second pull-in request, diagnosing the open-circuit fault of the first relay or the second relay;

after the engine is started, if the transmission chain is disconnected, diagnosing the adhesion fault of the first relay;

and after the engine is started, if the transmission chain is closed, diagnosing the adhesion fault of the second relay.

5. The relay diagnostic method according to claim 4, wherein after the electronic control unit issues the first pull-in request and the second pull-in request, if the starter does not pull the engine to start, it is determined that the first relay or the second relay is open.

6. The relay diagnostic method according to claim 4, wherein the diagnosing of the first relay sticking fault and the diagnosing of the second relay sticking fault are performed alternately after the engine is started.

7. The relay diagnosis method according to claim 6, wherein in the first relay adhesion fault diagnosis step, if the transmission chain is disconnected, the second relay is engaged after the second engagement request is issued after the fault diagnosis is delayed, and if the first relay is adhered, the starter pulls the engine to start.

8. The relay diagnosis method according to claim 7, wherein if the engine is kept idling after starting and the time of the drive train disconnection exceeds a fault diagnosis delay time, the diagnosis of the sticking fault of the first relay is performed first, and the diagnosis of the sticking fault of the second relay is performed when the drive train is closed in normal running of the vehicle.

9. The relay diagnosis method according to claim 6, wherein in the second relay adhesion fault diagnosis step, if the transmission chain is closed, the first relay is attracted after the first attraction request is sent out after the fault diagnosis is delayed, and if the second relay is adhered, the starter drags the engine to start.

10. The relay diagnosis method according to claim 9, wherein if the engine is running immediately after completion of the start-up and the power train is closed before the failure diagnosis delay, the diagnosis of the sticking failure of the second relay is performed first, and the diagnosis of the sticking failure of the first relay is performed in the next idle condition.

Technical Field

The invention relates to the field of automobile electronic manufacturing, in particular to a starter control method and a relay diagnosis method.

Background

In the prior art, an AT (automatic transmission) idling automatic start-stop vehicle generally controls a starter by a first relay and a second relay together, wherein the first relay is attracted after receiving an attraction request sent by an electronic control unit, the second relay is attracted when a transmission chain is disconnected, the starter is switched on and dragged after the first relay and the second relay are attracted, and the starter is switched on to start dragging, and the first relay and the second relay are disconnected after the starter is started to stop dragging.

The current control method has the following two defects:

(1) and the second relay is attracted in the time when the transmission chain is disconnected, if the electronic control unit is electrified and the engine is not started and the engine is automatically stopped until the engine is started next time, the second relay is always attracted, so that the service life of the engine can be shortened due to heating and aging.

(2) The current relay diagnosis method cannot timely diagnose all faults of the first relay and the second relay, and potential safety hazards exist and after-sale maintenance is not facilitated.

Disclosure of Invention

The invention aims to provide a starter control method and a relay diagnosis method, and aims to solve the problems that in the prior art, the second relay is heated and aged due to long-time pull-in, so that the service life of the second relay is shortened, and the current relay diagnosis method cannot timely diagnose all faults of the first relay and the second relay.

In order to achieve the above object, the present invention provides a starter control method and a relay diagnosis method, the starter control method including the steps of:

the electronic control unit sends a first attraction request and a second attraction request;

a first relay receives a first attraction request sent by the electronic control unit, and the first relay attracts;

the second relay receives a second pull-in request sent by the electronic control unit, and the second relay pulls in when the disconnection of the transmission chain is detected;

the starter is connected with a power supply and starts to drag the engine;

and after the engine is started, the first relay and the second relay are disconnected to terminate dragging.

Optionally, the high end of the first relay and the high end of the second relay are connected to a main relay, and the low end of the first relay and the low end of the second relay are controlled by the electronic control unit.

Optionally, the low-end control signal of the second relay includes a transmission chain state, denoted as B _ ptlck, sent by the automatic transmission control unit, and when B _ ptlck is False, the transmission chain state is disconnected.

A relay diagnosis method is characterized by comprising the following steps:

after the electronic control unit sends out a first pull-in request and a second pull-in request, diagnosing the open-circuit fault of the first relay or the second relay;

after the engine is started, if the transmission chain is disconnected, diagnosing the adhesion fault of the first relay;

and after the engine is started, if the transmission chain is closed, diagnosing the adhesion fault of the second relay.

Optionally, after the electronic control unit sends the first pull-in request and the second pull-in request, if the starter does not drag the engine to start, it is determined that the first relay or the second relay is open.

Optionally, the diagnosing of the first relay adhesion fault and the diagnosing of the second relay adhesion fault are performed alternately after the engine is started.

Optionally, in the step of diagnosing the adhesion fault of the first relay, if the transmission chain is disconnected, the second relay is actuated after the second actuation request is sent out after the fault diagnosis is delayed, and if the first relay is adhered, the starter drives the generator to start.

Optionally, if the engine maintains idle speed after being started and the time for disconnecting the transmission chain exceeds the fault diagnosis delay, the diagnosis of the adhesion fault of the first relay is firstly performed, and the diagnosis of the adhesion fault of the second relay is performed when the transmission chain is closed during normal running of the vehicle.

Optionally, in the step of diagnosing adhesion faults of the second relay, if the transmission chain is closed, the first relay is attracted after the first attraction request is sent out after the fault diagnosis is delayed, and if the second relay is adhered, the starter drags the engine to start.

Optionally, if the engine runs immediately after the engine is started and the transmission chain is closed before the fault diagnosis is delayed, the adhesion fault of the second relay is diagnosed first, and the adhesion fault of the first relay is diagnosed under the next idle working condition.

In summary, in the starter control method provided by the present invention, the electronic control unit sends the first pull-in request and the second pull-in request; a first relay receives a first attraction request sent by the electronic control unit, and the first relay attracts; the second relay receives a second pull-in request sent by the electronic control unit, and the second relay pulls in when the disconnection of the transmission chain is detected; the starter is connected with a power supply and starts to drag the generator; after the engine start is completed, the first relay and the second relay are turned off to terminate the drag. In the relay diagnosis method, after an electronic control unit sends a first pull-in request and a second pull-in request, the open-circuit fault of a first relay or a second relay is diagnosed; after the engine is started, if the transmission chain is disconnected, diagnosing the adhesion fault of the first relay; and after the engine is started, if the transmission chain is closed, diagnosing the adhesion fault of the second relay. The relay control method provided by the invention avoids unnecessary actuation of the second relay, reduces the probability of heating and aging of the second relay, prolongs the service life of the relay, and can diagnose the faults of open circuit, adhesion and the like of the first relay and the second relay starting relay in time by using the diagnosis method provided by the invention, thereby effectively solving the problems that the adhesion fault and the like of the first relay cannot be reported by the previous diagnosis scheme, being beneficial to after-sale maintenance and avoiding potential safety hazards.

Drawings

FIG. 1 is a block diagram of a conventional relay control method;

fig. 2 is a schematic structural diagram of a module of a relay control method according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of a relay control method according to an embodiment of the present invention;

fig. 4 is a schematic flowchart of a relay diagnosis method according to an embodiment of the present invention;

fig. 5 is a flowchart of open-circuit fault diagnosis and repair of the first relay or the second relay according to the embodiment of the present invention;

fig. 6 is a flowchart of diagnosing and repairing an adhesion fault of a first relay and a second relay according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of the second relay actuation using a prior art relay control method;

FIG. 8 is a schematic diagram illustrating a pull-in condition of a second relay when the relay control method according to the embodiment of the present invention is used;

FIG. 9 is a test result diagram illustrating the open-circuit fault diagnosis of the first relay or the second relay using the relay diagnosis method provided by the embodiment of the invention;

fig. 10 is a schematic diagram of a test result of diagnosing a first relay adhesion fault by using the relay diagnosis method provided by the embodiment of the invention;

fig. 11 is a schematic diagram of a test result of diagnosing a second relay adhesion fault by using the relay diagnosis method provided by the embodiment of the invention;

the method comprises the steps of 1-power supply, 10-first relay, 2-main relay, 20-second relay, 3-starter state feedback signal S _ kl50, 30-starter, 4-CAN bus, 40-automatic gearbox control unit, 5-transmission chain state B _ ptlck, 50-electronic control unit, 6-first attraction request and 7-second attraction request.

Detailed Description

The following describes in more detail embodiments of the present invention with reference to the schematic drawings. Advantages and features of the present invention will become apparent from the following description and claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

As described in the background art, unnecessary actuation of the second relay may occur in the conventional relay control method, and meanwhile, the front relay diagnosis method cannot diagnose all faults of the first relay and the second relay in time, so that potential safety hazards exist and after-sale maintenance is not facilitated.

Therefore, in order to solve the above problems in the electronic manufacturing of automobiles, the present invention provides a starter control method.

Referring to fig. 1 to 3, fig. 3 is a schematic flowchart of a starter control method according to an embodiment of the present invention, and as shown in fig. 3, the relay control method includes the following steps:

step S1: the electronic control unit sends a first attraction request and a second attraction request;

step S2: a first relay receives a first attraction request sent by the electronic control unit, and the first relay attracts;

step S3: the second relay receives a second pull-in request sent by the electronic control unit, and the second relay pulls in when the disconnection of the transmission chain is detected;

step S4: the starter is connected with a power supply and starts to drag the generator;

step S5: after the generator is started, the first relay and the second relay are disconnected to terminate dragging.

Specifically, referring to fig. 1 and 2, fig. 1 shows a conventional starter control method, in which a high terminal of the first relay 10 and a high terminal of the second relay 20 are both connected to a main relay 2(UBR), and a low terminal of the first relay 10 is controlled by an electronic control unit 50; the low end of the second relay 20 is controlled by the automatic transmission control unit 40, when the electronic control unit sends a first engaging request, the first relay 10 engages after receiving the first engaging request sent by the electronic control unit 50, a low end control signal of the second relay 20 is derived from a transmission chain state sent by the automatic transmission control unit 40 and is marked as B _ ptlck, the automatic transmission control unit 40 is connected with the low end of the second relay through the CAN bus 4, and when the transmission chain state B _ ptlck received by the second relay 20 is False, that is, when the transmission chain is disconnected, the second relay 20 engages. Specifically, the first relay and the second relay include a coil and a switch, when the first relay 10 receives a first engaging request sent by the electronic control unit 50, the coil of the first relay 10 is energized to generate an attraction force, and the switch of the first relay is engaged, when the transmission chain state B _ ptlck received by the second relay 20 is equal to a False signal, the coil of the second relay is energized to generate an attraction force, and the switch of the second relay is engaged, when the switches of the first relay and the second relay are simultaneously engaged, the starter power supply 1(UBD) is turned on to start dragging the engine, and after the engine is started, the first relay 10 and the second relay 20 are turned off to terminate the dragging of the starter.

As shown in fig. 2, the control method provided by the present invention improves a conventional relay control method, wherein a second pull-in request is introduced into a pull-in condition of a second relay according to a pull-in request of an automatic transmission start-stop vehicle start relay, an electronic control unit 50 sends out a first pull-in request and a second pull-in request, a first relay 10 pulls in the first relay 10 after receiving the first pull-in request sent by the electronic control unit 50, a second relay 20 pulls in the second relay 20 after receiving the second pull-in request sent by the electronic control unit 50 and when detecting that a transmission chain is disconnected, and a starter turns on a power supply 1(UBD) to start dragging an engine after the first relay 10 and the second relay 20 are pulled in.

Correspondingly, the invention also provides a relay diagnosis method, as shown in fig. 4, the relay diagnosis method includes the following steps:

step S1: after the electronic control unit sends out a first pull-in request and a second pull-in request, diagnosing the open-circuit fault of the first relay or the second relay;

step S2: after the engine is started, if the transmission chain is disconnected, diagnosing the adhesion fault of the first relay;

step S3: and after the engine is started, if the transmission chain is closed, diagnosing the adhesion fault of the second relay.

In step S1, as shown in fig. 5, the flowchart of diagnosing and repairing the open-circuit fault of the first relay or the second relay specifically includes the following steps: clicking a starting button, sending a first pull-in request and a second pull-in request by an electronic control unit, and judging that the first relay or the second relay is in an open-circuit fault after certain fault confirmation delay if an engine is not dragged by a starting motor; in the next driving cycle, if the first pull-in request and the second pull-in request sent by the electronic control unit enable the engine to drag, and the fault repair confirmation delay is experienced, it is confirmed that the open-circuit fault repair of the first relay or the second relay is completed or no fault diagnosis is completed.

In step S2, as shown in fig. 2 and 6, the specific steps of diagnosing and repairing the first relay adhesion fault are as follows: after the engine is started, if the idling transmission chain is kept disconnected, namely B _ ptlck is False, the idling transmission chain is subjected to a specific delay test pulse 1 to be sent out, the test pulse 1 enables a second pull-in request to be set, a second relay is pulled in, if a first relay is adhered, a starter can drag the engine to be started, a starter state feedback signal S _ kl50 can be set, and after certain confirmation delay, the adhesion fault of the first relay is reported; in the next driving cycle, if the starter cannot be enabled to drag the engine by the test pulse 1 and certain fault repair confirmation delay is experienced, it is judged that the first relay is adhered to fault repair or the first relay is subjected to no fault diagnosis.

In step S3, as shown in fig. 2 and 6, the specific steps of diagnosing and repairing the second relay adhesion fault are as follows: after the engine is started, if a driving transmission chain is closed immediately, namely B _ ptlck is True, a specific delay test pulse 2 is sent out, a first absorption request is set, a first relay absorbs, at the moment, if a second relay is adhered, a starter can drag the engine, a starter state feedback signal S _ kl50 is set, and a certain delay confirmation second relay adhesion fault is reported; in the next driving cycle, if the starter can not be dragged by the test pulse 2 to the engine and certain fault repair confirmation delay is experienced, it is judged that the second relay is adhered to fault repair or the second relay is subjected to no fault diagnosis.

The diagnosis of the adhesion fault of the first relay and the second relay is performed alternately after the engine is started, if the engine runs immediately after the start is finished and the transmission chain is closed before the specific fault diagnosis is delayed, the diagnosis of the adhesion fault of the second relay is performed first, and the diagnosis of the adhesion fault of the first relay is performed on the next idle working condition; if the time for keeping the idle speed transmission chain disconnected after starting exceeds the specific fault diagnosis delay time, the diagnosis of the adhesion fault of the first relay is firstly carried out, and the diagnosis of the adhesion fault of the second relay is carried out when the normal running transmission chain of the vehicle is closed.

As shown in fig. 7 and 8, the pull-in condition of the second relay in the relay control method provided by the invention is compared with the pull-in condition of the existing relay control method used in a certain project. Fig. 7 shows the test results of the conventional relay control method: after the power is on, the electronic control unit of the second relay controls the PIN angle to maintain a low level, the second relay (one end is connected with 12v voltage, and the other end is connected with the electronic control unit to control the PIN angle) is always attracted (the electronic control unit controls the PIN to be at the angle low level to form potential difference attraction), and the second relay is not disconnected until the engine is successfully started; fig. 8 shows the test results of the same project using the relay control method provided by the present invention: after the power is on, the electronic control unit of the second relay controls the PIN angle to maintain a high level, the second relay is disconnected (one end of the second relay is connected with 12v voltage, and the other end of the second relay is connected with the electronic control unit to control the PIN angle, because the two ends of the second relay are both high voltage, potential difference cannot be formed), the second relay is attracted until the electronic control unit sends a starting request, and the second relay is disconnected after the engine is started successfully.

Fig. 9 to 11 show the results of the fault diagnosis and repair test of the first relay and the second relay according to the present invention. The test result shows that by using the diagnosis method provided by the invention, the open circuit of the first relay or the second relay, the adhesion fault of the first relay and the adhesion fault of the second relay can be reported and repaired in time, so that the problems that the adhesion fault of the first relay cannot be reported by the previous diagnosis method and the like are effectively solved, the after-sale maintenance is facilitated, and the potential safety hazard is avoided.

In summary, in the relay control method provided by the present invention, the electronic control unit sends the first pull-in request and the second pull-in request; a first relay receives a first attraction request sent by the electronic control unit, and the first relay attracts; the second relay receives a second pull-in request sent by the electronic control unit, and the second relay pulls in when the disconnection of the transmission chain is detected; the starter is connected with a power supply and starts to drag the engine; after the engine start is completed, the first relay and the second relay are turned off to terminate the drag. In the relay diagnosis method, after an electronic control unit sends a first pull-in request and a second pull-in request, the open-circuit fault of a first relay or a second relay is diagnosed; after the engine is started, if the transmission chain is disconnected, diagnosing the adhesion fault of the first relay; and after the engine is started, if the transmission chain is closed, diagnosing the adhesion fault of the second relay. The relay control method provided by the invention avoids unnecessary actuation of the second relay, reduces the probability of heating and aging of the second relay, prolongs the service life of the relay, and can diagnose the faults of open circuit, adhesion and the like of the first relay and the second relay starting relay in time by using the diagnosis method provided by the invention, thereby effectively solving the problems that the adhesion fault and the like of the first relay cannot be reported by the previous diagnosis scheme, being beneficial to after-sale maintenance and avoiding potential safety hazards.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.