Method, system and medium for calculating engine management system shutdown timer

Abstract

The application provides a kind of engine management system shutdown timing calculation method, system and medium, it is related to the technical field of automobile engine control, method includes the engine electronic control unit and the related controller of sending shutdown timing signal;Engine electronic control unit determines whether the shutdown timing signal obtained is derived from the shutdown timing signal sent by the related controller through CAN bus;Based on determining the validity of the shutdown timing signal derived from the shutdown timing signal sent by the related controller;Using the valid shutdown timing signal received by engine electronic control unit, calculate the engine operating time;Based on the engine operating time, calculate the engine shutdown timing time.The application does not need additional hardware, solves the calculation of shutdown timing signal when there is no shutdown timing chip, not only ensures the calculation accuracy of shutdown timing, but also reduces the high hardware cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile engine control, and in particular relates to an engine management system shutdown timing calculation method, system and medium. BACKGROUND

[0002] The shutdown timer is one of the basic components of the engine management system (EMS), which mainly provides the engine off time (EOT) signal for the engine management system (EMS). The EOT signal is widely used in the engine management system (EMS) control strategy (such as start control and emission control) and diagnostic strategy (such as cooling system water temperature sensor rationality diagnosis). Whether the EOT signal is effective and its reliable precision is a key factor in engine control.

[0003] At present, the engine management system (EMS) shutdown timing signal (EOT) is generally realized by the shutdown timing chip built in the electronic control unit (ECU), which calculates the engine shutdown time from the ECU sleep to the ECU wake-up power-on period. However, the ECU needs to increase the shutdown timing chip separately, which increases the cost of the controller. The prior art discloses a method for calculating the shutdown time of the engine management system. The timer starts to supply power to the main controller according to the time interval in the engine shutdown timer. After the main controller is reset and the power is turned on, the current timer value is read from the engine shutdown timer, and the current timer value is compared with the last stored timer value. The comparison result is used to determine whether the engine shutdown timer is abnormal. However, this method uses the time signal of the external timer to determine whether the internal timer of the ECU is abnormal, which requires an additional time controller, has high hardware cost, and does not fully integrate the vehicle time signal, resulting in low calculation precision of the shutdown timing. SUMMARY

[0004] To solve the problems of low calculation precision and high hardware cost in the existing engine management system shutdown timing calculation method, the present application aims to provide an engine management system shutdown timing calculation method, system and medium, which ensures the calculation precision of the shutdown timing and reduces the high hardware cost.

[0005] In order to achieve the above technical effects, the technical solutions of the present application are as follows:

[0006] An engine management system shutdown timing calculation method, comprising the following steps:

[0007] The engine electronic control unit determines whether the obtained shutdown timing signal is from the shutdown timing signal sent by the related controller through the CAN bus;

[0008] Based on the determination that the shutdown timing signal is from the shutdown timing signal sent by the related controller, the validity of the shutdown timing signal is determined;

[0009] Using the valid shutdown timing signal received by the engine electronic control unit, the engine operating condition time is calculated;

[0010] Based on the engine operating condition time, the engine shutdown timing time is calculated.

[0011] Further, if the engine electronic control unit is provided with a shutdown timing chip, the shutdown timing signal obtained by the engine electronic control unit is from the shutdown timing signal received by the shutdown timing chip, and the engine shutdown timing time is calculated according to the shutdown timing signal received by the shutdown timing chip; otherwise, the shutdown timing signal obtained by the engine electronic control unit is from the shutdown timing signal sent by the related controller.

[0012] Further, the determination of the validity of the shutdown timing signal specifically includes:

[0013] When the shutdown timing signal obtained by the engine electronic control unit is from the shutdown timing signal sent by the related controller, if the flag bit of the shutdown timing signal obtained by the engine electronic control unit through the CAN bus is valid, the obtained shutdown timing signal is valid, and the shutdown timing signal received through the CAN bus is used for calculation; otherwise, the obtained shutdown timing signal is invalid, and the shutdown timing signal is calculated by assignment.

[0014] Further, the engine operating condition time includes: engine shutdown to engine ECU chip hibernation cumulative time t1, engine ECU chip hibernation to opening ignition key keyOn cumulative time t2, opening ignition key keyOn to engine start cumulative time t3, engine start to engine shutdown cumulative time t4, engine start to closing ignition key keyOff cumulative time t5, and opening ignition key keyOn to closing ignition key keyOff cumulative time t6.

[0015] Further, the calculation of the engine operating condition time specifically includes:

[0016] The engine stop sign is positioned to the engine ECU chip hibernation sign position time accumulation, and an engine stop to engine ECU chip hibernation accumulated time t1 is obtained; the opening ignition key keyOn to engine start time accumulation is obtained, and an opening ignition key keyOn to engine start accumulated time t3 is obtained; the engine start to the closing ignition key keyOff time accumulation is obtained, and an engine start to the closing ignition key keyOff accumulated time t5 is obtained; the opening ignition key keyOn to the closing ignition key keyOff time accumulation is obtained, and an opening ignition key keyOn to the closing ignition key keyOff accumulated time t6 is obtained;

[0017] The opening ignition key keyOn to the closing ignition key keyOff accumulated time t6 is added to the engine start to the closing ignition key keyOff accumulated time t5, and the engine stop to the engine ECU chip hibernation accumulated time t1 is subtracted, so that an engine ECU chip hibernation to the opening ignition key keyOn accumulated time t2 is obtained.

[0018] Further, the engine stop timing time is calculated based on the engine working condition time, and specifically comprises:

[0019] The engine stop to engine ECU chip hibernation accumulated time t1, the engine ECU chip hibernation to the opening ignition key keyOn accumulated time t2 and the opening ignition key keyOn to the engine start accumulated time t3 are added, so that an engine start to engine stop accumulated time t4 is obtained, and the engine start to engine stop accumulated time t4 is recorded as the engine stop timing time.

[0020] The application further provides an engine management system stop timing calculation system, the system comprising:

[0021] An engine electronic control unit and a related controller for sending a stop timing signal;

[0022] The related controller communicates with the engine electronic control unit through a CAN bus, and the engine electronic control unit calculates the engine stop timing time according to the stop timing signal sent by the related controller to the engine electronic control unit;

[0023] The engine electronic control unit is provided with a first signal judgment module, a second signal judgment module, a first time calculation module and a second time calculation module;

[0024] The first signal judgment module is used for the engine electronic control unit to judge whether the obtained stop timing signal is derived from the stop timing signal sent by the related controller through the CAN bus;

[0025] The second signal judging module is used for determining the shutdown timing signal from the related controller, judging the validity of the shutdown timing signal;

[0026] The first time calculating module is used for calculating the engine working condition time by using the valid shutdown timing signal received by the engine electronic control unit.

[0027] The second time calculating module is used for calculating the engine shutdown timing time according to the engine working condition time.

[0028] Further, if the engine electronic control unit is provided with a shutdown timing chip, the engine electronic control unit calculates the engine shutdown timing time according to the shutdown timing signal received by the shutdown timing chip; otherwise, the engine electronic control unit calculates the engine shutdown timing time according to the shutdown timing signal sent by the related controller to the engine electronic control unit.

[0029] The application further provides a computer readable storage medium, wherein at least one executable instruction is stored in the storage medium, and the executable instruction is used for making a computer device execute the operation of the engine management system shutdown timing calculation method.

[0030] Compared with the prior art, the beneficial effects of the technical scheme of the application are as follows:

[0031] The application provides an engine management system shutdown timing calculation method, system and medium, which first analyzes the integrated time signal on the whole vehicle, and then the engine electronic control unit receives the shutdown timing signal sent by the related controller to the engine electronic control unit, determines the shutdown timing signal from the related controller, judges the validity of the shutdown timing signal, receives the valid shutdown timing signal by the engine electronic control unit, calculates the engine working condition time, and finally calculates the engine shutdown timing time based on the engine working condition time. The shutdown timing signal of the CAN communication interaction replaces the signal of the shutdown timing chip in the ECU, reduces the redundancy function of the controller, does not need additional hardware, reduces the cost, solves the calculation of the shutdown timing signal when there is no shutdown timing chip, ensures the calculation accuracy of the shutdown timing, and reduces the high hardware cost. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Fig. 1 shows a flowchart of an engine management system shutdown timing calculation method according to an embodiment of the application;

[0033] Figure 2 Fig. 2 shows a shutdown timing signal selection logic diagram according to an embodiment of the application;

[0034] Figure 3A logic diagram of engine operating condition according to an embodiment of the present application

[0035] Figure 4 A logic diagram of time t1 calculation according to an embodiment of the present application

[0036] Figure 5 A logic diagram of time t5 calculation according to an embodiment of the present application

[0037] Figure 6 A logic diagram of time t6 calculation according to an embodiment of the present application

[0038] Figure 7 A logic diagram of time t2 calculation according to an embodiment of the present application

[0039] Figure 8 A structure diagram of a calculation system of engine management system shutdown timing according to an embodiment of the present application

[0040] Figure 9 A structure diagram of an engine electronic control unit according to an embodiment of the present application

[0041] Figure 10 A flow diagram of a calculation method of engine management system shutdown timing according to an embodiment of the present application

[0042] 1. An engine electronic control unit; 110. A first signal judging module; 120. A second signal judging module; 130. A first time calculation module; 140. A second time calculation module; 2. A related controller sending shutdown timing signal. DETAILED DESCRIPTION

[0043] The accompanying drawings are only used for illustrative description and should not be construed as limitation to the present application;

[0044] In order to better illustrate the present embodiment, some parts of the drawings are omitted, enlarged or reduced, and the description of "up", "down" and other parts of the directions is not a limitation to the present application;

[0045] For those skilled in the art, it is understandable that some well-known descriptions in the drawings can be omitted;

[0046] The position relationship described in the drawings is only used for illustrative description and should not be construed as limitation to the present application;

[0047] The technical solutions of the present application will be further described in combination with the drawings and embodiments.

[0048] The present embodiment further provides a calculation method of engine management system shutdown timing, referring to Figure 1 , comprising the following steps:

[0049] S1. The engine electronic control unit determines whether the acquired shutdown timing signal is from the shutdown timing signal sent by the related controller through the CAN bus;

[0050] In step S1, referring to Figure 2 , the source of the shutdown timing signal can be selected by calibration. If the engine electronic control unit is provided with a shutdown timing chip, the shutdown timing signal acquired by the engine electronic control unit is from the shutdown timing signal received by the shutdown timing chip, and the engine shutdown timing is calculated according to the shutdown timing signal received by the shutdown timing chip; otherwise, the shutdown timing signal acquired by the engine electronic control unit is from the shutdown timing signal sent by the related controller.

[0051] S2. Based on the determination that the shutdown timing signal is from the shutdown timing signal sent by the related controller, determine the validity of the shutdown timing signal;

[0052] In step S2, referring to Figure 2 , the determination of the validity of the shutdown timing signal specifically includes:

[0053] When the shutdown timing signal acquired by the engine electronic control unit is from the shutdown timing signal sent by the related controller, if the flag bit of the shutdown timing signal acquired by the engine electronic control unit through the CAN bus is valid, the acquired shutdown timing signal is valid, and the shutdown timing signal received through the CAN bus will be involved in the calculation; otherwise, the acquired shutdown timing signal is invalid, and the shutdown timing signal is assigned for calculation.

[0054] S3. Calculate the engine operating time of each condition using the valid shutdown timing signal received by the engine electronic control unit;

[0055] In step S3, referring to Figure 3 , the engine operating time of each condition includes: engine shutdown to engine ECU chip hibernation cumulative time t1, engine ECU chip hibernation to opening ignition key keyOn cumulative time t2, opening ignition key keyOn to engine start cumulative time t3, engine start to engine shutdown cumulative time t4, engine start to closing ignition key keyOff cumulative time t5, and opening ignition key keyOn to closing ignition key keyOff cumulative time t6, t6 is the external input ECU controller time IP_EngineOffTime; t1', t2', t3'… respectively represent the operating time of each condition of the next system running cycle, and the calculation of the engine operating time of each condition specifically includes:

[0056] S31. Referring to Figure 4The engine stop flag is positioned to the engine ECU chip hibernation flag position time, and the engine stop to engine ECU chip hibernation accumulated time t1 is obtained.

[0057] S32. The keyOn is accumulated to the engine start time, and the keyOn to engine start accumulated time t3 is obtained.

[0058] S32. Referring to Figure 5 The engine start to keyOff time is accumulated, and the engine start to keyOff accumulated time t5 is obtained.

[0059] S34. Referring to Figure 6 The keyOn to keyOff time is accumulated, and the keyOn to keyOff accumulated time t6 is obtained.

[0060] S35. Referring to Figure 7 The keyOn to keyOff accumulated time t6 is added to the engine start to keyOff accumulated time t5, and the engine ECU chip hibernation to keyOn accumulated time t2 is obtained by subtracting the engine stop to engine ECU chip hibernation accumulated time t1.

[0061] S4. Based on the engine operating condition time, the engine stop timing time is calculated.

[0062] In step S4, the engine stop timing time is calculated based on the engine operating condition time, specifically including:

[0063] The engine stop to engine ECU chip hibernation accumulated time t1, the engine ECU chip hibernation to keyOn accumulated time t2, and the keyOn to engine start accumulated time t3 are added to obtain the engine start to engine stop accumulated time t4, and the engine start to engine stop accumulated time t4 is recorded as the engine stop timing time; when the engine starts successfully, the stop timing signal calculation reset flag is positioned, and the t1-t6 time signal is reset to 0.

[0064] In this embodiment, the logic key is to calculate the engine ECU chip sleep to open the ignition key keyOn cumulative time t2, through the engine running cycle logic, t2 time is equal to t6 external input ECU controller keyOff to keyOn time plus t5 engine start to keyOff cumulative time minus t1 engine stop to ECU control chip sleep cumulative time, first of all, the engine electronic control unit and the related controller chain sending stop timing signal are connected, then through the integration analysis of the whole vehicle time signal, the engine electronic control unit calculates the stop timing signal sent by the related controller to the engine electronic control unit, that is, the stop timing signal sent by other related controllers, mainly through the reception of the stop timing signal transmitted by CAN, such as IP_EngineOffTime signal, instead of the signal counted by the stop timing chip inside the ECU, and through the new logic operation, the engine stop timing time is calculated, the controller redundancy function is reduced, no additional hardware is needed, the cost is reduced, the calculation of the stop timing signal without stop timing chip is solved, not only the calculation accuracy of the stop timing is guaranteed, but also the high hardware cost is reduced.

[0065] As shown in Figure 8 An engine management system stop timing calculation system, the system comprises:

[0066] An engine electronic control unit 1 and a related controller 2 sending a stop timing signal;

[0067] The related controller 2 communicates with the engine electronic control unit 1 through CAN bus, and the engine electronic control unit 1 calculates the engine stop timing time according to the stop timing signal sent by the related controller 2 to the engine electronic control unit 1.

[0068] CAN bus is a kind of serial communication protocol, which is used for data communication in automotive electronic system, and it has high reliability, real-time performance and anti-interference performance. CAN bus is widely used in automotive field, which is used for communication between various subsystems in vehicle, such as engine management system, brake system, air conditioning system, etc. In addition, CAN bus is also applied in industrial automation field, which is used for communication between machine control, instrument and other devices. In general, CAN bus is a reliable, efficient and real-time communication protocol, which has wide application prospect and plays an important role in automotive and industrial control fields.

[0069] If the engine electronic control unit 1 is provided with a stop timing chip, the engine electronic control unit 1 calculates the engine stop timing time according to the stop timing signal received by the stop timing chip; otherwise, the engine electronic control unit 1 calculates the engine stop timing time according to the stop timing signal sent by the related controller 2 to the engine electronic control unit 1.

[0070] Referring to Figure 9 , the engine electronic control unit 1 is provided with a first signal judgment module 101, a second signal judgment module 102, a first time calculation module 103 and a second time calculation module 104;

[0071] The first signal judgment module 101 is used for the engine electronic control unit 1 to judge whether the obtained stop timing signal is derived from the stop timing signal sent by the related controller 2;

[0072] The second signal judgment module 102 is used for determining the validity of the stop timing signal derived from the stop timing signal sent by the related controller 2;

[0073] The first time calculation module 103 is used for calculating the engine working condition time by using the valid stop timing signal received by the engine electronic control unit 1;

[0074] The second time calculation module 104 is used for calculating the engine stop timing time according to the engine working condition time.

[0075] In the embodiment, first, the engine electronic control unit and the related controller sending the stop timing signal are connected, and then through the integration analysis of the time signal on the whole vehicle, the engine electronic control unit calculates the stop timing time of the engine according to the stop timing signal sent by the related controller to the engine electronic control unit, that is, uses the stop timing signal sent by other related controllers, mainly through receiving the stop timing signal transmitted on the CAN, such as the IP_EngineOffTime signal, instead of the signal counted by the stop timing chip inside the ECU, and through new logic operation, calculates the stop timing time of the engine, reduces the controller redundancy function, does not need to add hardware, reduces the cost, solves the calculation of the stop timing signal when there is no stop timing chip, not only ensures the calculation accuracy of the stop timing, but also reduces the high hardware cost.

[0076] The embodiment further provides a computer readable storage medium, the storage medium stores at least one executable instruction, and the executable instruction runs on the computer equipment to make the computer equipment execute the operation of the engine management system stop timing calculation method, please refer to Figure 10 , as follows:

[0077] S101. Judge the source of the stop timing signal; please refer to Figure 2 The source of the stop timing signal can be selected by calibration, when the engine ECU contains a stop timing chip inside, the stop timing signal received by the stop timing chip inside the engine ECU is selected, otherwise, the stop timing signal is received through the CAN signal.

[0078] S201. The validity of the stop counting signal; see Figure 2 When the received CAN communication time signal flag bit is valid, the CAN time signal is directly received for calculation. If it is invalid, the default value is assigned for the stop counting signal calculation.

[0079] S301. Engine operating time calculation; including: see Figure 4 The engine stop flag is set to the engine ECU chip hibernation flag position time accumulation, and the engine stop to engine ECU chip hibernation accumulation time t1 is obtained. The keyOn to engine start time is accumulated to obtain the keyOn to engine start accumulation time t3; see Figure 5 The engine start to keyOff time is accumulated to obtain the engine start to keyOff accumulation time t5; see Figure 6 The keyOn to keyOff time is accumulated to obtain the keyOn to keyOff accumulation time t6.

[0080] S401. Calculate the chip hibernation time to keyOn time t2; see Figure 7 The keyOn to keyOff accumulation time t6 is added to the engine start to keyOff accumulation time t5, and the engine stop to engine ECU chip hibernation accumulation time t1 is subtracted to obtain the engine ECU chip hibernation to keyOn accumulation time t2.

[0081] S501. Calculate the engine stop counting time; according to the engine running logic, the engine stop time T=t4=t1+t2+t3.

[0082] When the engine starts successfully, the stop counting signal calculation reset flag is set, and the t1-t6 time signal is reset to 0.

[0083] In the embodiment, the logic key is to calculate the engine ECU chip sleep to open the ignition key keyOn accumulated time t2, through the engine running cycle logic, t2 time is equal to t6 external input ECU controller keyOff to keyOn time plus t5 engine start to keyOff accumulated time minus t1 engine stop to ECU control chip sleep accumulated time, first, the engine electronic control unit and the related controller chain that sends the stop timing signal are connected, then through the integration analysis of the time signal on the whole vehicle, the engine electronic control unit calculates the stop timing signal sent to the engine electronic control unit by the related controller, that is, the stop timing signal sent by other related controllers, mainly through the reception of the stop timing signal transmitted by CAN, such as IP_EngineOffTime signal, instead of the signal counted by the stop timing chip inside the ECU, and through new logic operation, the engine stop timing time is calculated, the controller redundancy function is reduced, no additional hardware is needed, the cost is reduced, the calculation of the stop timing signal when there is no stop timing chip is solved, not only the calculation accuracy of the stop timing is ensured, but also the high hardware cost is reduced.

[0084] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted.

Claims

1. A method of calculating engine management system down-time, characterised by, The method comprises the following steps: The engine electronic control unit determines whether the obtained shutdown timing signal is from the shutdown timing signal sent by the related controller through the CAN bus; Based on the determination that the shutdown timing signal is from the shutdown timing signal sent by the related controller, the validity of the shutdown timing signal is determined; Based on the fact that the engine electronic control unit receives the valid shutdown timing signal, the engine operating condition time is calculated, specifically including: The engine shutdown flag is set to the engine ECU chip hibernation flag position time, and the engine shutdown to engine ECU chip hibernation cumulative time t1 is obtained; the keyOn to engine start cumulative time t3 is obtained by accumulating the keyOn to engine start time; the engine start to keyOff cumulative time t5 is obtained by accumulating the engine start to keyOff time; the keyOn to keyOff cumulative time t6 is obtained by accumulating the keyOn to keyOff time; The keyOn to keyOff cumulative time t6 is added to the engine start to keyOff cumulative time t5, and the engine ECU chip hibernation to keyOn cumulative time t2 is obtained by subtracting the engine shutdown to engine ECU chip hibernation cumulative time t1; Based on the engine operating condition time, the engine shutdown timing time is calculated, specifically including: The engine shutdown to engine ECU chip hibernation cumulative time t1, the engine ECU chip hibernation to keyOn cumulative time t2, and the keyOn to engine start cumulative time t3 are added to obtain the engine start to engine shutdown cumulative time t4, and the engine start to engine shutdown cumulative time t4 is recorded as the engine shutdown timing time.

2. The method of claim 1, wherein: If the engine electronic control unit is provided with a shutdown timing chip, the shutdown timing signal obtained by the engine electronic control unit is from the shutdown timing signal received by the shutdown timing chip, and the engine shutdown timing time is calculated according to the shutdown timing signal received by the shutdown timing chip; otherwise, the shutdown timing signal obtained by the engine electronic control unit is from the shutdown timing signal sent by the related controller.

3. The method of claim 2, wherein: The validity of the shutdown timing signal is determined, specifically including: When the engine electronic control unit obtains the shutdown timing signal from the shutdown timing signal sent by the related controller, if the engine electronic control unit obtains the shutdown timing signal through the CAN bus, the flag bit of the shutdown timing signal is valid, the obtained shutdown timing signal is valid, and the shutdown timing signal received through the CAN bus is used for calculation; otherwise, the obtained shutdown timing signal is invalid, and the shutdown timing signal is calculated by assignment.

4. A system for calculating engine management system downtime, the system being configured to implement the method of calculating engine management system downtime according to any one of claims 1 to 3, characterized in that The system comprises: An engine electronic control unit and a related controller for sending a shutdown timing signal; The related controller communicates with the engine electronic control unit through the CAN bus, and the engine electronic control unit calculates the engine shutdown timing time according to the shutdown timing signal sent by the related controller to the engine electronic control unit; The engine electronic control unit is provided with a first signal judgment module, a second signal judgment module, a first time calculation module and a second time calculation module; The first signal judgment module is used for the engine electronic control unit to judge whether the obtained shutdown timing signal is derived from the shutdown timing signal sent by the related controller through the CAN bus; The second signal judgment module is used for determining the shutdown timing signal derived from the related controller to judge the validity of the shutdown timing signal; The first time calculation module is used for calculating the engine working condition time by using the valid shutdown timing signal received by the engine electronic control unit; The second time calculation module is used for calculating the engine shutdown timing time according to the engine working condition time.

5. The engine management system shutdown timer calculation system of claim 4, wherein, If the engine electronic control unit is provided with a shutdown timing chip, the engine electronic control unit calculates the engine shutdown timing time according to the shutdown timing signal received by the shutdown timing chip; otherwise, the engine electronic control unit calculates the engine shutdown timing time according to the shutdown timing signal sent by the related controller to the engine electronic control unit.

6. A computer readable storage medium characterized by, The storage medium stores at least one executable instruction, and the executable instruction makes the computer device execute the operation of the engine management system shutdown timing calculation method according to any one of claims 1-3 when running on the computer device.

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