Engine stop control method, system, and computer storage medium

Abstract

The application provides an engine shutdown control method, system and computer storage medium. The engine shutdown control method comprises: determining whether the motor has a gear shifting request when receiving a shutdown request of the engine; if the motor has a gear shifting request, obtaining a target gear position and an actual gear position of the motor; and if the target gear position is inconsistent with the actual gear position, adjusting the actual gear position to be consistent with the target gear position, and then performing an engine shutdown operation. Through the strategy of controlling the engine to delay shutdown in the process of the inconsistency between the target gear position and the actual gear position of the motor, the application can solve the problems of the acceleration dip and the huge impact caused by the clutch starting caused by the shutdown and then the acceleration in the gear shifting process of the motor, and the power loss possibly caused by the engine shutdown in the torque output path switching process of the motor.

Description

Technical Field

[0001] The present invention relates to the field of engine control, and in particular to an engine shutdown control method, system and computer storage medium. Background Art

[0002] With increasingly stringent national regulations on fuel consumption and emissions, and the development of electrification systems, hybrid technology is key to achieving energy conservation and emission reduction. To adapt to national policies and meet emission regulations, vehicle manufacturers and parts suppliers are looking for solutions. However, the battery technology of current pure electric vehicle technology systems is complex and costly. The structure of the hybrid system determines the types of operating modes that can be achieved. Therefore, in order to achieve multiple operating modes, hybrid systems usually have a relatively complex structure. In some single-motor hybrid systems, acceleration drops caused by engine shutdown during motor shifting are common, as well as power loss caused by engine shutdown during the switching of motor torque output paths, which seriously affect the driving experience. Summary of the Invention

[0003] In view of this, the present invention provides an engine shutdown control method, system and computer storage medium, which delay engine shutdown under preset conditions to solve the problem of acceleration drop and huge impact caused by clutch starting when the motor is shut down during gear shifting and then accelerating, as well as the problem of power loss that may occur when the engine is shut down during the switching of the motor torque output path.

[0004] In a first aspect, the present invention provides an engine shutdown control method, comprising:

[0005] Upon receiving the engine stop request, determining whether the motor has a gear shift request;

[0006] If the motor has a gear shift request, obtain the motor's target gear and actual gear;

[0007] If the target gear position is inconsistent with the actual gear position, the actual gear position is adjusted to be consistent with the target gear position, and then the engine is shut down.

[0008] Wherein, obtaining the target gear of the motor includes:

[0009] The target gear is obtained according to a request to change a motor torque output path or a request to downshift the motor during braking.

[0010] The motor torque output path change request includes:

[0011] a request to switch from a first torque output path, in which the motor is connected to the engine and disconnected from the transmission, to a second torque output path, in which the motor is disconnected from the engine and connected to the transmission.

[0012] The motor downshift request during the braking process includes:

[0013] A motor downshift request triggered by braking when the motor is disconnected from the engine and connected to the transmission.

[0014] The adjusting the actual gear position to be consistent with the target gear position includes:

[0015] If the shifting conditions are met, the motor torque is reduced to zero;

[0016] The motor performs the gear-shifting operation and shifts into neutral;

[0017] determining a target speed of the motor according to the target gear position, and controlling the motor to enter a speed closed-loop mode to adjust the speed of the motor to the target speed;

[0018] Shift gear to the target gear.

[0019] After the engine shutdown operation is performed, the method further includes:

[0020] Calculate the target torque value according to the preset parameters;

[0021] Send torque recovery request;

[0022] The motor is controlled to perform torque recovery based on the no-load torque according to the target torque value.

[0023] The preset parameters include at least one of an accelerator pedal opening, a vehicle speed, a reference output torque and a current driving state of the vehicle.

[0024] Wherein, the method further includes:

[0025] If the target gear position of the motor is consistent with the actual gear position, the engine is shut down.

[0026] In a second aspect, the present invention further provides an engine shutdown control system, comprising:

[0027] at least one processor;

[0028] At least one memory is coupled to the at least one processor and stores instructions for execution by the at least one processor, wherein when the instructions are executed by the at least one processor, the apparatus implements the engine shutdown control method as described above.

[0029] In a third aspect, the present invention further provides a computer storage medium having computer program instructions stored thereon; when the computer program instructions are executed by a processor, the engine shutdown control method as described above is implemented.

[0030] In summary, the engine shutdown control method, system, and computer storage medium of the present invention include the following steps: upon receiving an engine shutdown request, determining whether the motor has a gear shift request; if the motor has a gear shift request, obtaining the motor's target gear and actual gear; and if the target gear and actual gear are inconsistent, adjusting the actual gear to be consistent with the target gear before executing the engine shutdown operation. By implementing a strategy for delaying engine shutdown during inconsistencies between the motor's target gear and actual gear, the present invention can address the acceleration drop caused by engine shutdown during motor gear shifting, as well as the power loss that may occur when the engine is shut down during switching of the motor's torque output path.

[0031] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 FIG1 is a flow chart of an engine shutdown control method according to a first embodiment;

[0033] Figure 2 is a structural diagram of a vehicle controller according to the first embodiment;

[0034] Figure 3 FIG1 is a diagram showing an ISG path structure according to the first embodiment;

[0035] Figure 4 FIG1 is a diagram showing an EFAD path structure according to the first embodiment;

[0036] Figure 5 is a specific flow chart of the engine shutdown control method according to the first embodiment;

[0037] Figure 6 is a specific flow chart of an engine stop control method according to a second embodiment;

[0038] Figure 7 FIG. 1 is a specific flowchart of an engine stop control method according to a third embodiment. DETAILED DESCRIPTION

[0039] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0040] First embodiment

[0041] Figure 1 FIG. 1 is a flow chart of an engine stop control method according to a first embodiment.

[0042] like Figure 1 As shown, an embodiment of the present invention provides an engine shutdown control method, comprising:

[0043] Step 201: upon receiving an engine stop request, determining whether the motor has a gear shift request;

[0044] Step 202: If the motor has a gear shift request, obtain the target gear position and actual gear position of the motor;

[0045] Step 203: If the target gear position is inconsistent with the actual gear position, the actual gear position is adjusted to be consistent with the target gear position, and then the engine is shut down.

[0046] Figure 2 FIG. 1 is a structural diagram of a vehicle controller according to an embodiment of the present invention. Figure 3 As shown, the VCM is the vehicle controller, where the DCDC is a high-voltage / low-voltage DC-to-DC converter directly connected to the motor. The ECM is the engine controller, directly connected to the engine. The IGM is connected to the DCDC and is the controller for the DCDC and the motor. The TCM is connected to the transmission and is the transmission controller. The BECM is connected to the high-voltage battery and is the battery controller. In addition, the vehicle controller also includes the OBC (external charging controller), the CEM (vehicle electronic and electrical controller), and the CCM (air conditioning controller). The vehicle's power system consists of the engine, motor, 7DCT transmission, reducer, half-axles, and wheels, with seven power output modes, including:

[0047] 1. No power output: C1 and C2 are in the separated state, and both the odd-numbered and even-numbered axes are not in gear;

[0048] 2. Idle power generation: C1 is disengaged, C2 is engaged, even-numbered shafts are not pre-geared, the engine is running, and the drive motor generates electricity;

[0049] 3. Engine start: C1 is disengaged, C2 is engaged, and there is no pre-gear on the even-numbered shaft. The motor starts the engine by dragging it.

[0050] 4. Pure electric drive: C1 and C2 are separated, the even-numbered axle is engaged, and the motor provides power to drive the vehicle;

[0051] 5. Energy recovery: C1 and C2 are separated, the even-numbered axle is engaged, and the braking energy drives the engine to generate electricity;

[0052] 6. Driving charging: C1 and C2 are engaged, the engine drives the vehicle through odd gears, and the motor drives the motor to generate electricity through the C2 clutch;

[0053] 7. Hybrid drive: C1 is engaged, C2 is disengaged, both odd-numbered and even-numbered shafts are in gear, the engine outputs power through the odd-numbered gears, and the motor outputs power through the even-numbered shafts, and the two jointly drive the vehicle.

[0054] Figure 3 FIG. 1 is a diagram showing an ISG path structure according to the first embodiment. Figure 4 FIG. 1 is a diagram showing the EFAD path structure according to the first embodiment. Figure 3 and Figure 4 As shown, the motor has three torque output paths: ISG path, EFAD path and Disengaged path. The ISG path means that the motor is connected to the engine through the C2 clutch and the motor is disconnected from the even-numbered shaft of the gearbox. When the motor is in the ISG path, the motor and the even-numbered shaft clutch are connected, and the motor is in gear 0. The EFAD path means that the motor is directly connected to the gear (2, 4, 6) of the even-numbered shaft of the gearbox for assisting or charging, and the motor is disconnected from the engine. When the motor is in the EFAD path, the motor has three gears 2-4-6. When the vehicle speed and throttle conditions are met, the motor will shift gears. The Disengaged path means that the motor is disconnected from the engine and the even-numbered shaft of the gearbox. The torque of the engine refers to the torque output by the engine from the crankshaft end. When the motor is connected to the input shaft end of the even-numbered shaft of the transmission, there are two situations when the target gear of the motor is inconsistent with the actual gear:

[0055] 1) During the motor shifting process; for example, when the vehicle speed drops to 46km / h during braking, the 4th gear is downgraded to 2nd gear. Since the SOC (state of charge) increases during braking, if the engine stops and the driver steps on the accelerator, the motor cannot output positive torque due to the gear shifting. At this time, the vehicle speed exceeds 10km / h. For functional safety reasons, 12V cannot be used for starting. The clutch is required to drag the engine, which is about 80-120NM. This puts a heavy load on the moving vehicle. Under normal circumstances, the torque of the clutch dragging the engine needs to be compensated by the motor torque. At this time, the motor cannot compensate the torque of the clutch dragging the engine during gear shifting, which will cause acceleration drops and huge impacts, greatly affecting drivability.

[0056] 2) During the motor torque output path switching process, for example, switching from the ISG path to the EFAD path, the motor is in gear 0 and the target gear is 2. Since the motor speed is around 1000 rpm in the ISG path and around 300 rpm in the EFAD path, the motor speed needs to be regulated. During the ISG path, the motor charges while the vehicle is crawling. When the SOC is full, the ISG path is exited and a shutdown request is made. If the shutdown occurs at this time, the motor is regulating while the engine is not started, resulting in power loss.

[0057] Therefore, the present invention avoids the above situation by defining a strategy of delaying engine shutdown when the motor target gear and actual gear are inconsistent, even if the engine meets the shutdown conditions, until the motor reaches the target shaft gear.

[0058] In an embodiment of the present invention, when the engine shutdown request is first received, it is determined whether the motor has a gear shift request. If the motor has a gear shift request, the target gear and actual gear of the motor are obtained, and it is determined whether the target gear is consistent with the actual gear. If the target gear is consistent with the actual gear, the engine shutdown operation is performed. If the target gear is inconsistent with the actual gear, the actual gear is adjusted until it is consistent with the target gear, and then the engine shutdown operation is performed. There are two situations in which the target gear and the actual gear are inconsistent, one is the motor shifting process during braking, and the other is the motor torque output path change process. Among them, the motor shifting process during braking includes a motor downshift request during braking under the second torque output path, and the second torque output path is the motor disconnected from the engine and connected to the gearbox, that is, the EFAD path. The motor torque output path change process includes a request to switch from the first torque output path to the second torque output path, and the first torque output path is the motor connected to the engine and disconnected from the gearbox, that is, the ISG path.

[0059] In step 203, when the actual gear position is adjusted to match the target gear position, if the shifting conditions are met, the motor torque is reduced to zero; the motor is disengaged and engaged in neutral; the motor's target speed is determined based on the target gear position, and the motor is controlled to enter a speed closed-loop mode to adjust the motor speed to the target speed; and the target gear position is engaged. After the engine is shut down, a target torque value is calculated based on preset parameters; a torque recovery request is sent; and based on the target torque value, the motor is controlled to perform torque recovery based on the no-load torque. The preset parameters include accelerator pedal position, vehicle speed, reference output torque, and the current vehicle driving state.

[0060] Specifically, Figure 5 FIG. 1 is a specific flow chart of the engine shutdown control method according to the first embodiment. Figure 5As shown, in the engine shutdown control method, after receiving the initial engine shutdown request, it is determined whether the clicked target gear is consistent with the actual gear. If not, the actual gear is adjusted to be consistent with the target gear, and then the final engine shutdown request is determined, the engine shutdown operation is executed, and pure electric driving is performed through motor drive.

[0061] An embodiment of the present invention provides an engine shutdown control method, comprising: upon receiving an engine shutdown request, determining whether the motor has a gear shift request; if the motor has a gear shift request, obtaining the motor's target gear and actual gear; and if the target gear and actual gear are inconsistent, adjusting the actual gear to be consistent with the target gear before executing the engine shutdown operation. By controlling the delayed engine shutdown strategy during the inconsistency between the motor's target gear and actual gear, the present invention can address the acceleration drop and significant impact caused by clutch activation during a motor shutdown during a gear shift, as well as the power loss that may occur during engine shutdown during the switching of the motor's torque output path.

[0062] Second embodiment

[0063] Figure 6 FIG. 1 is a specific flow chart of the engine shutdown control method according to the second embodiment. Figure 6 As shown, in the embodiment of the present invention, when the motor is braking in the EFAD path and the engine is in the process of shifting from 6th gear to 4th gear or from 4th gear to 2nd gear, the engine changes from the running state to the shutdown state. Then, if the driver steps on the accelerator, due to the high vehicle speed (greater than 10km / h), the voltage drop caused by 12V starting will cause safety problems and the 12V starting will be disabled. The clutch will be used to start the engine, but at this time the motor cannot compensate for the torque lost by the clutch starting the engine during gear shifting, causing a huge impact and a serious drop in acceleration. During the 4-2 braking process, the engine is about to stop. At this time, the driver will start the engine with a large accelerator and will choose to start the engine with the clutch, but the motor cannot compensate for the clutch torque, causing a serious drop in acceleration and affecting drivability. Normal clutch starting is as follows Figure 4 As shown, the motor needs to compensate for the torque of 80Nm-100Nm. Therefore, the control flow of the engine requesting to stop during the motor shifting process under the EFAD path is defined as follows Figure 5 As shown:

[0064] 1) Request shift phase

[0065] During normal driving, the TCM collects real-time signals such as vehicle speed and accelerator pedal position to determine whether to shift gears. If the shift conditions are met, it sends a shift request to the VCM. The VCM arbitrates and makes a decision on the shift request, sends a shift permission command to the TCM, and transfers ultimate control of the vehicle's powertrain to the TCM.

[0066] 2) Motor torque reduction stage

[0067] In order to ensure smooth gear shifting, the TCM sends a torque reduction request to the IGM, controls the motor to reduce torque, and ensures the stability of the motor speed at the moment of shifting to neutral.

[0068] 3) Unblocking stage

[0069] After the motor completes torque reduction, the TCM controls the shift actuator to shift the transmission into neutral.

[0070] 4) Motor speed regulation stage

[0071] After the gear is disengaged, in order to make the meshing gear and synchronizer speed of the target gear reach the synchronous state as soon as possible, the TCU sends a request to the IGM to control the motor to enter the speed closed-loop working mode, and dynamically adjusts the target speed of the gear shift as the adjustment target amount, and judges whether the speed difference range requirements before gear engagement are met based on the speed synchronization conditions of each gear.

[0072] 5) Gear shifting stage

[0073] To quickly and smoothly engage the target gear and minimize shift shock, the interaction force between the meshing teeth must be minimized. Similar to the shift-out phase, the interaction force between the meshing teeth is minimized when the motor's actual output torque is zero. Therefore, after speed synchronization conditions are met and before shifting, the TCM controls the motor's torque to ensure that the motor's actual output torque is zero while maintaining the speed required for shift synchronization. This ensures quick and smooth shifting without shock or noise.

[0074] 6) The engine is allowed to stop and the motor torque is restored

[0075] After the transmission is engaged in the target gear, the engine can be shut down, and the motor must perform torque recovery to meet the vehicle's power requirements. The VCM calculates the target torque output value based on the accelerator pedal position, vehicle speed, reference output torque, and current vehicle driving state, and sends it to the TCM. The TCM then sends a torque recovery request and target torque value to the IGM, controlling the motor to perform torque recovery based on the original no-load torque. When the motor output torque reaches the target torque calculated by the VCM, the motor directly enters normal driving mode, and the vehicle resumes normal driving.

[0076] The specific implementation process of this embodiment is detailed in the first embodiment, and will not be repeated in this embodiment.

[0077] Third embodiment

[0078] Figure 7 FIG. 1 is a specific flow chart of the engine shutdown control method according to the third embodiment. Figure 7As shown, in the embodiment of the present invention, when the motor is in the ISG path, the motor is in gear 0, and when the motor is in the EFAD path, the motor gear may be gear 2, 4, or 6. When switching from the ISG path to the EFAD path, the motor requests gear 2, and the actual gear is gear 0. When switching from the EFAD path to the ISG path, the motor requests gear 0, and the actual gear is gear 2. Since one of the conditions of the ISG path is engine start, there is no shutdown problem when switching from the EFAD path to the ISG path. However, when switching from the ISG path to the EFAD path, if the SOC is full and there are no other starting conditions, the engine will send a shutdown request. If the engine is shut down at this time and the motor is still shifting gears, power interruption will occur.

[0079] When the ISG path requests a switch to the EFAD path, the motor gear must be shifted from 0 to 2. At this time, the vehicle speed is approximately 4 km / h. The motor speed in the EFAD path is determined by the vehicle speed, meaning that in 2nd gear, the EFAD path motor speed is approximately 300 rpm. Since the motor speed in the ISG path is approximately 1000 rpm, while in the EFAD path, the motor speed is approximately 300 rpm, motor speed regulation is required. Only after this is completed can the motor engage 2nd gear. If the motor reaches full SOC while the vehicle is crawling on the ISG path, the ISG path must be exited and a shutdown request must be made. If the motor is shut down at this point, it will be unable to provide power during the speed regulation and shifting process, and the engine will not have started, resulting in power loss. During the ISG path crawling process, the SOC is full, the engine needs to be shut down and the motor ISG path needs to be exited and switched to the EFAD path. At this time, if the engine is shut down and the driver continues to crawl, the motor needs to adjust the speed to switch to the EFAD path and shift to 2nd gear. During this process, the motor cannot provide power. Since the power is sufficient, the engine will not start, so power will be lost until the motor completes the gear change and can continue to output power. Therefore, the control flow of the engine requesting to shut down when the ISG path requests to switch to the EFAD path is defined as follows Figure 7 As shown:

[0080] Next, define the control process of the engine shutdown during the motor torque output path request switching process as follows: Figure 7 As shown:

[0081] 1) The motor torque output path request changes (from ISG to EFAD)

[0082] The purpose of the motor in the ISG path is to charge at a low speed. Therefore, during the crawling process of the ISG path, when the SOC is full, the ISG path must exit and switch to the EFAD path.

[0083] 2) Request shift phase

[0084] The motor is in 0 gear in the ISG path, and the motor gear position can be 2, 4 or 6 in the EFAD path. When the ISG path is switched to the EFAD path, the motor requests gear 2, and the actual gear position is 0. Therefore, the motor requests gear 2.

[0085] 2) Motor torque reduction phase

[0086] In order to ensure smooth gear shifting, the TCM sends a torque reduction request to the IGM, controls the motor to reduce torque, and ensures the stability of the motor speed at the moment of shifting to the neutral gear.

[0087] 3) Gear shifting phase

[0088] After the motor torque reduction is completed, the TCM controls the gear shifting actuator to engage the neutral gear of the transmission.

[0089] 4) Motor speed regulation phase

[0090] After the gear shifting is completed, in order to make the meshing gear and the synchronizer of the target gear reach the synchronous state as soon as possible, the TCU sends a request to the IGM to control the motor to enter the speed closed-loop working mode, dynamically adjusts the target speed of the gear shifting as the adjustment target, and judges whether the speed difference range requirement before the gear engagement is met according to the speed synchronization condition of each gear.

[0091] 5) Gear engagement phase

[0092] In order to quickly and smoothly engage the target gear and reduce the gear shifting impact, the interaction force between the meshing teeth should be as small as possible. Similarly to the gear shifting phase, when the actual output torque of the motor is zero, the interaction force between the meshing teeth is the smallest. Therefore, after the speed synchronization condition is met, before the gear engagement, the TCM should control the torque of the motor, on the basis of ensuring that the motor speed meets the gear shifting synchronization requirement, so that the actual output torque of the motor is zero, and the gear engagement is fast and smooth, without impact and noise.

[0093] 6) The motor torque output path change is completed, the engine is allowed to stop, and the motor torque is restored to engage the target gear of the transmission. After the motor torque output path change is completed, the engine can be stopped, and the motor should be restored to torque to meet the power demand of the vehicle. The VCM calculates the target torque output value according to the accelerator pedal opening, vehicle speed, reference output torque and current vehicle driving state, and sends it to the TCM; the TCM sends a torque recovery request and target torque value to the IGM to control the motor to recover torque on the basis of the original no-load torque. When the motor output torque reaches the target torque calculated by the VCM, the motor directly enters the normal driving mode, and the vehicle returns to the normal driving state.

[0094] The embodiment of the application also provides an engine stop control system, comprising:

[0095] at least one processor;

[0096] At least one memory is coupled to the at least one processor and stores instructions for execution by the at least one processor, and when the instructions are executed by the at least one processor, the apparatus implements the engine shutdown control method as described above.

[0097] An embodiment of the present invention further provides a computer storage medium having computer program instructions stored thereon; when the computer program instructions are executed by a processor, the engine shutdown control method described above is implemented.

[0098] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0100] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An engine shutdown control method, characterized in that: include: Upon receiving the engine stop request, determining whether the motor has a gear shift request; If the motor has a gear shift request, obtain the motor's target gear and actual gear; If the target gear position is inconsistent with the actual gear position, adjusting the actual gear position to be consistent with the target gear position, and then performing an engine shutdown operation; The step of obtaining the target gear position of the motor includes: acquiring the target gear position according to a request to change the motor torque output path or a request to downshift the motor during braking; The adjusting the actual gear position to be consistent with the target gear position includes: If the gear shifting conditions are met, the motor torque is reduced to zero; The motor performs the gear-shifting operation and shifts into neutral; determining a target speed of the motor according to the target gear position, and controlling the motor to enter a speed closed-loop mode to adjust the speed of the motor to the target speed; Shifting gears to the target gear position; After the engine shutdown operation is performed, the method further includes: Calculating a target torque value according to preset parameters, wherein the preset parameters include at least one of an accelerator pedal opening, a vehicle speed, a reference output torque, and a current vehicle driving state; Send torque recovery request; The motor is controlled to perform torque recovery based on the no-load torque according to the target torque value.

2. The engine shutdown control method according to claim 1, characterized in that: The motor torque output path change request includes: a request to switch from a first torque output path, in which the motor is connected to the engine and disconnected from the transmission, to a second torque output path, in which the motor is disconnected from the engine and connected to the transmission.

3. The engine shutdown control method according to claim 1, characterized in that: The motor downshift request during the braking process includes: A motor downshift request triggered by braking when the motor is disconnected from the engine and connected to the transmission.

4. The engine shutdown control method according to claim 1, characterized in that: The method further comprises: If the target gear position of the motor is consistent with the actual gear position, the engine is shut down.

5. An engine shutdown control system, characterized in that: include: at least one processor; At least one memory is coupled to the at least one processor and stores instructions for execution by the at least one processor, the instructions, when executed by the at least one processor, causing the processor to execute the engine stop control method according to any one of claims 1 to 4.

6. A computer storage medium, characterized in that The computer storage medium stores computer program instructions; when the computer program instructions are executed by the processor, the engine shutdown control method according to any one of claims 1 to 4 is implemented.

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