Vehicle control method, device and computer storage medium

Abstract

The present invention discloses a vehicle control method, device and computer storage medium. The vehicle control method includes the following steps: when the vehicle meets the cold start condition, connecting the vehicle's transmission device and the vehicle's motor to drive the vehicle through the motor; controlling the vehicle's engine to run at idle speed; regularly obtaining the current temperature of the vehicle's catalyst; when the current temperature meets the preset temperature condition, disconnecting the transmission device from the motor and connecting the transmission device to the engine to drive the vehicle through the engine. The present invention also discloses a vehicle control device and computer storage medium. The present invention electrically drives the vehicle to travel during a cold start and controls the engine's idle speed, thereby achieving heating of the catalyst while avoiding large fluctuations in the engine's operating conditions, thereby reducing the increase in the engine's original exhaust during a cold start and reducing the content of harmful gases in the vehicle's tail exhaust.

Description

[0001] This application is a divisional application with application number 202110463207.2. The application date of the parent case is April 27, 2021. The name of the invention of the parent case is: Vehicle control method, device and computer storage medium. Technical Field

[0002] The present invention relates to the technical field of vehicle starting, and in particular to a vehicle control method, device and computer storage medium. Background Art

[0003] During a cold start, the catalyst needs to be heated to ignition temperature to achieve optimal catalytic conversion efficiency. However, to meet driving needs, the engine's power output is often directly controlled to the wheels. This can cause significant fluctuations in engine operating conditions, increase engine emissions, and result in excessive harmful gases in the vehicle's exhaust when the catalyst temperature is low.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to provide a vehicle control method, device and computer storage medium, aiming to reduce the content of harmful gases in the vehicle tail exhaust when the catalyst temperature is low.

[0006] To achieve the above object, the present invention provides a vehicle control method, the vehicle control method comprising the following steps:

[0007] When the vehicle meets a cold start condition, connecting the transmission device of the vehicle to the motor of the vehicle to drive the vehicle through the motor;

[0008] controlling the engine of the vehicle to idle;

[0009] Regularly obtaining the current temperature of the vehicle catalyst;

[0010] When the current temperature meets a preset temperature condition, the transmission device is disconnected from the motor, and the transmission device is connected to the engine to drive the vehicle through the engine.

[0011] Optionally, when the vehicle meets the cold start condition, the step of connecting the transmission device of the vehicle to the motor of the vehicle to drive the vehicle by the motor includes:

[0012] When the vehicle meets the cold start condition, detecting whether a preset parking condition is met;

[0013] When the preset parking condition is not met, the transmission device of the vehicle is connected to the motor of the vehicle to drive the vehicle by the motor.

[0014] Optionally, after the step of detecting whether a preset parking condition is satisfied, the vehicle control method further includes:

[0015] When the parking condition is satisfied and a request to start the engine is received, the engine and the motor are connected, and the engine is controlled to operate so as to charge a battery connected to the motor.

[0016] Optionally, before the step of controlling the engine operation, the method further includes:

[0017] Regularly obtaining the current temperature of the vehicle catalyst;

[0018] Obtaining a torque value corresponding to the current temperature;

[0019] The output torque of the engine to the motor is adjusted according to the torque value corresponding to the current temperature.

[0020] Optionally, after the step of disconnecting the transmission device from the motor and connecting the transmission device to the engine to drive the vehicle through the engine, the method further includes:

[0021] Upon receiving a torque increase request triggered by a user, adjusting the output torque of the motor to the transmission device according to the torque value corresponding to the torque increase request, and driving the motor via a battery connected to the motor;

[0022] When a torque reduction request triggered by a user is received, the output torque from the engine to the motor is adjusted according to the torque value corresponding to the torque reduction request to charge the battery connected to the motor.

[0023] Optionally, when the current temperature satisfies a preset temperature condition, the step of disconnecting the transmission device from the motor and connecting the transmission device to the engine to drive the vehicle by the engine includes:

[0024] When the current temperature satisfies the preset temperature condition, detecting whether the rotation speed of the engine matches the input shaft speed of the transmission device;

[0025] When the engine speed matches the input shaft speed of the transmission, the transmission is disconnected from the motor and the transmission is connected to the engine to drive the vehicle through the engine. When the engine speed does not match the input shaft speed of the transmission, the engine speed is adjusted according to the input shaft speed, and the process returns to the step of detecting whether the engine speed matches the input shaft speed of the transmission.

[0026] Optionally, between the step of regularly acquiring the current temperature of the vehicle catalyst and the step of disconnecting the transmission device from the motor and connecting the transmission device to the engine when the current temperature meets a preset temperature condition, so as to drive the vehicle through the engine, the method further includes:

[0027] Obtaining a preset temperature of the vehicle catalyst;

[0028] obtaining a heating index of the vehicle catalyst according to the current temperature and the preset temperature;

[0029] It is determined whether the heating index is greater than or equal to a preset value, wherein when the heating index is greater than or equal to the preset value, it is determined that the current temperature meets the preset temperature condition.

[0030] Optionally, after the step of disconnecting the transmission device from the motor and connecting the transmission device to the engine to drive the vehicle through the engine, the method further includes:

[0031] Upon receiving a torque adjustment request triggered by a user, obtaining a continuous running time of the engine;

[0032] When the continuous operation time is less than or equal to a preset time, obtaining a preset torque value corresponding to at least one of the temperature of the engine and the current temperature of the vehicle catalyst, and adjusting the total output torque from the engine to the transmission device and the motor according to the preset torque value;

[0033] When the continuous operation time is greater than the preset time, the total output torque from the engine to the transmission device and the motor is adjusted according to the torque value corresponding to the torque adjustment request.

[0034] In addition, to achieve the above-mentioned purpose, the present invention also provides a vehicle control device, which includes: a memory, a processor, and a vehicle control program stored on the memory and runnable on the processor. When the vehicle control program is executed by the processor, the steps of the vehicle control method described in any one of the above are implemented.

[0035] In addition, to achieve the above-mentioned purpose, the present invention also provides a computer storage medium, on which a vehicle control program is stored. When the vehicle control program is executed by a processor, the steps of the vehicle control method described in any one of the above are implemented.

[0036] The vehicle control method, device, and computer storage medium proposed in an embodiment of the present invention connect the vehicle's transmission device to the vehicle's motor to drive the vehicle via the motor when the vehicle meets cold start conditions; control the vehicle's engine to idle; regularly obtain the current temperature of the vehicle's catalyst; and when the current temperature meets a preset temperature condition, disconnect the transmission device from the motor and connect the transmission device to the engine to drive the vehicle via the engine. By electrically driving the vehicle during a cold start and controlling the engine's idle speed, the present invention achieves heating of the catalyst while avoiding significant fluctuations in the engine's operating conditions, thereby reducing the increase in engine exhaust emissions during a cold start and lowering the content of harmful gases in the vehicle's tailpipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiment of the present invention;

[0038] Figure 2 A schematic flow chart of an embodiment of a vehicle control method of the present invention;

[0039] Figure 3 A flow chart of another embodiment of a vehicle control method according to the present invention;

[0040] Figure 4 A flow chart of another embodiment of a vehicle control method according to the present invention;

[0041] Figure 5 A flow chart of another embodiment of a vehicle control method according to the present invention;

[0042] Figure 6 This is a structural diagram of the power system of the vehicle of the present invention.

[0043] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0044] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] An embodiment of the present invention provides a solution by electrically driving the vehicle during a cold start and controlling the engine's idling, thereby achieving the goal of heating the catalyst while avoiding large fluctuations in the engine's operating conditions, thereby reducing the increase in the engine's original emissions during a cold start and lowering the content of harmful gases in the vehicle's tail exhaust.

[0046] like Figure 1 As shown, Figure 1 It is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiment of the present invention.

[0047] The terminal in the embodiment of the present invention is a control device of a vehicle, for example, a master controller of the vehicle, a power system controller of the vehicle, etc.

[0048] like Figure 1 As shown, the terminal may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, and a memory 1004. The communication bus 1002 is used to implement connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and optionally the user interface 1003 may also include a standard wired interface and a wireless interface. The memory 1004 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1004 may optionally also be a storage device independent of the aforementioned processor 1001.

[0049] Those skilled in the art will understand that Figure 1 The terminal structure shown in the figure does not constitute a limitation to the terminal, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0050] like Figure 1 As shown, the memory 1004 as a computer storage medium may include a user interface module and a vehicle control program.

[0051] exist Figure 1 In the terminal shown, the user interface 1003 is mainly used to connect to the client (user end) and communicate data with the client; and the processor 1001 can be used to call the vehicle control program stored in the memory 1005 and perform the following operations:

[0052] When the vehicle meets a cold start condition, connecting the transmission device of the vehicle to the motor of the vehicle to drive the vehicle through the motor;

[0053] controlling the engine of the vehicle to idle;

[0054] Regularly obtaining the current temperature of the vehicle catalyst;

[0055] When the current temperature meets a preset temperature condition, the transmission device is disconnected from the motor, and the transmission device is connected to the engine to drive the vehicle through the engine.

[0056] Furthermore, the processor 1001 may call the vehicle control program stored in the memory 1004 and perform the following operations:

[0057] When the vehicle meets the cold start condition, detecting whether a preset parking condition is met;

[0058] When the preset parking condition is not met, the transmission device of the vehicle is connected to the motor of the vehicle to drive the vehicle by the motor.

[0059] Furthermore, the processor 1001 may call the vehicle control program stored in the memory 1004 and perform the following operations:

[0060] When the parking condition is satisfied and a request to start the engine is received, the engine and the motor are connected, and the engine is controlled to operate so as to charge a battery connected to the motor.

[0061] Furthermore, the processor 1001 may call the vehicle control program stored in the memory 1004 and perform the following operations:

[0062] Regularly obtaining the current temperature of the vehicle catalyst;

[0063] Obtaining a torque value corresponding to the current temperature;

[0064] The output torque of the engine to the motor is adjusted according to the torque value corresponding to the current temperature.

[0065] Furthermore, the processor 1001 may call the vehicle control program stored in the memory 1004 and perform the following operations:

[0066] Upon receiving a torque increase request triggered by a user, adjusting the output torque of the motor to the transmission device according to the torque value corresponding to the torque increase request, and driving the motor via a battery connected to the motor;

[0067] When a torque reduction request triggered by a user is received, the output torque from the engine to the motor is adjusted according to the torque value corresponding to the torque reduction request to charge the battery connected to the motor.

[0068] Furthermore, the processor 1001 may call the vehicle control program stored in the memory 1004 and perform the following operations:

[0069] When the current temperature satisfies the preset temperature condition, detecting whether the rotation speed of the engine matches the input shaft speed of the transmission device;

[0070] When the engine speed matches the input shaft speed of the transmission, the transmission is disconnected from the motor and the transmission is connected to the engine to drive the vehicle through the engine. When the engine speed does not match the input shaft speed of the transmission, the engine speed is adjusted according to the input shaft speed, and the process returns to the step of detecting whether the engine speed matches the input shaft speed of the transmission.

[0071] Furthermore, the processor 1001 may call the vehicle control program stored in the memory 1004 and perform the following operations:

[0072] Obtaining a preset temperature of the vehicle catalyst;

[0073] obtaining a heating index of the vehicle catalyst according to the current temperature and the preset temperature;

[0074] It is determined whether the heating index is greater than or equal to a preset value, wherein when the heating index is greater than or equal to the preset value, it is determined that the current temperature meets the preset temperature condition.

[0075] Furthermore, the processor 1001 may call the vehicle control program stored in the memory 1004 and perform the following operations:

[0076] Upon receiving a torque adjustment request triggered by a user, obtaining a continuous running time of the engine;

[0077] When the continuous operation time is less than or equal to a preset time, obtaining a preset torque value corresponding to at least one of the temperature of the engine and the current temperature of the vehicle catalyst, and adjusting the total output torque from the engine to the transmission device and the motor according to the preset torque value;

[0078] When the continuous operation time is greater than the preset time, the total output torque from the engine to the transmission device and the motor is adjusted according to the torque value corresponding to the torque adjustment request.

[0079] Reference Figure 2 In one embodiment, the vehicle control method includes the following steps:

[0080] Step S10, when the vehicle meets the cold start condition, connecting the transmission device of the vehicle to the motor of the vehicle to drive the vehicle through the motor;

[0081] Step S20, controlling the engine of the vehicle to idle;

[0082] In this embodiment, the vehicle is a hybrid electric vehicle (HEV), for example, a P2.5 configuration single motor hybrid electric vehicle, Figure 6 The motor of a P2.5 configuration single-motor hybrid vehicle has three torque output paths: 1. The motor is connected to the engine through the C2 clutch, and the motor is disconnected from the even-numbered shafts of the gearbox; 2. The motor is directly connected to the even-numbered shaft gears (2, 4, 6) of the gearbox for power assistance or charging, and the motor is disconnected from the engine; 3. The motor is disconnected from both the engine and the even-numbered shafts of the gearbox.

[0083] The vehicle has at least two driving modes: gasoline-driven and electric-driven, and the vehicle is driven by a combination of an engine (i.e., an internal combustion engine) and an electric motor.

[0084] Alternatively, a cold start refers to starting the vehicle when the engine water temperature of the vehicle is low, generally after not starting the vehicle for a long time, such as after parking at night. Therefore, a cold start condition may include that the engine water temperature is lower than a preset water temperature and the driver starts the vehicle.

[0085] Optionally, the vehicle includes a transmission device, which includes a drive shaft, a transmission, etc. The transmission device is used to transmit power generated by an engine or a motor to the wheels of the vehicle, so that the vehicle generates driving force.

[0086] Optionally, when the vehicle meets the cold start conditions, the vehicle's transmission device is connected to the vehicle's motor. At this time, the battery connected to the battery is discharged to make the motor rotate, and the power generated by the motor is transmitted to the vehicle's wheels through the transmission device, thereby driving the vehicle. This is the first stage of heating the catalyst: the engine idling idle heating catalyst stage.

[0087] Optionally, vehicle catalysts are used to reduce vehicle exhaust emissions. Vehicle catalysts may include three-way catalysts, particulate filters, and the like. The effective operating temperature of a vehicle catalyst typically needs to reach the ignition temperature, typically 300°C, to achieve a catalytic conversion efficiency exceeding 50%. To convert harmful gases such as CO, HC, and NOx from the engine exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction, the catalyst temperature typically needs to reach above 500°C. After a vehicle is cold-started, the high temperature from the engine exhaust is required to heat the catalyst from a relatively low temperature. The catalyst temperature does not reach the ignition temperature for a considerable period of time, during which time harmful gases generated by the engine cannot be effectively converted by the catalyst. Therefore, when the transmission is connected to the motor to drive the vehicle, the engine is controlled to idle to heat the catalyst. During this time, the transmission is disconnected from the engine, the engine does not output power, and the vehicle is driven solely by electric drive. When the engine is idling, the engine load will not change with the vehicle's driving conditions (for example, vehicle acceleration or deceleration), thereby minimizing fluctuations in engine operating conditions (for example, engine speed and air-fuel ratio). While maintaining relatively stable engine operating conditions, the deterioration of the engine's original emissions and the resulting increase in harmful gases are avoided.

[0088] Step S30, regularly obtaining the current temperature of the vehicle catalyst;

[0089] Step S40 , when the current temperature meets a preset temperature condition, disconnecting the transmission device from the motor and connecting the transmission device to the engine to drive the vehicle through the engine.

[0090] In this embodiment, while the catalyst is being heated by idling the engine, the current temperature of the vehicle's catalyst is periodically acquired. Based on this temperature, a determination is made as to whether a preset temperature condition is met. This temperature condition indicates the completeness of the catalyst heating. When the current temperature meets this condition, indicating a high catalytic conversion efficiency, the transmission can be disconnected from the motor and connected to the engine to drive the vehicle. This enters the second stage of catalyst heating: the engine-driven phase, where the electric drive mode is switched to gasoline-driven. During this phase, the engine's exhaust gas continuously heats the catalyst, continuously improving its catalytic conversion efficiency until it reaches optimal catalytic conversion efficiency.

[0091] Optionally, when the current temperature meets the preset temperature condition, since the engine has not yet output power to the transmission device, it is possible to detect whether the engine speed matches the input shaft speed of the transmission device. Specifically, the vehicle speed can be inversely calculated from the input shaft speed of the transmission device, and whether the engine speed matches the input shaft speed of the transmission device can be determined based on whether the vehicle speed meets the preset vehicle speed condition. When the engine speed matches the input shaft speed of the transmission device, the transmission device is connected to the motor and the transmission device is connected to the engine to drive the vehicle through the engine. At this time, the engine speed regulation process will be relatively gentle, and the engine speed and load during the driving process will not cause large fluctuations, which is conducive to controlling the smooth heating of the engine exhaust and catalyst. In this way, the impact force generated by the connection when the engine speed does not match the input shaft speed of the transmission device can be avoided, thereby maintaining the stability of the vehicle's driving.

[0092] Optionally, when the engine speed does not match the input shaft speed of the transmission device, the engine speed can be adjusted according to the input shaft speed, and the step of detecting whether the engine speed matches the input shaft speed of the transmission device is returned to make the engine speed match the input shaft speed of the transmission device as much as possible.

[0093] Optionally, if it is detected that the duration of the mismatch between the engine speed and the input shaft speed of the transmission device exceeds a preset time length, for example, the preset time length can be set to 6 seconds, at this time, in order to avoid the user waiting too much, the transmission device can be connected to the motor and the transmission device can be connected to the engine to drive the vehicle by the engine.

[0094] Optionally, after obtaining the current temperature of the vehicle's catalyst, a preset temperature of the vehicle's catalyst may also be obtained. For example, the preset temperature of the vehicle's catalyst is generally the catalyst's light-off temperature. A heating index of the vehicle's catalyst is obtained based on the current temperature and the preset temperature, and a determination is made as to whether the heating index is greater than or equal to a preset value. If the heating index is greater than or equal to the preset value, it indicates that the catalytic conversion efficiency of the catalyst is high. Therefore, it is determined that the current temperature meets the preset temperature condition, and the transmission is disconnected from the motor and connected to the engine to drive the vehicle. If the heating index is less than the preset value, it indicates that the catalytic conversion efficiency of the catalyst is low. Therefore, it is determined that the current temperature does not meet the preset temperature condition, and the process returns to the step of obtaining the current temperature of the vehicle's catalyst.

[0095] Alternatively, in addition to determining the heating index, the preset temperature condition may also include the vehicle's current catalyst temperature being greater than a preset temperature, so that the catalyst temperature reaches the preset temperature during the engine's idling phase to heat the catalyst. The preset temperature range is [300, 500]°C. For example, since the catalyst's light-off temperature is generally around 300°C, the preset temperature is typically set at 300°C.

[0096] Optionally, the catalyst heating index is used to quantitatively characterize the degree of catalyst heating completion. The initial value of the catalyst heating index is calculated by dividing the catalyst model temperature after engine startup by the catalyst preset temperature (i.e., the light-off temperature), with a maximum value of 2 and a minimum value of 0. Based on the initial value, the system then accumulates the product of the compensation coefficient and the engine intake airflow to obtain the heating index, with a maximum value of 3. The default value may be 2.

[0097] Optionally, catalyst model temperature: Since the catalyst is not equipped with a temperature sensor and the catalyst temperature cannot be directly collected, the basic exhaust temperature can be calculated based on the load and speed. The basic temperature is then corrected based on factors such as the ambient temperature, engine water temperature, engine ignition angle, and air-fuel ratio, and filtered using the corresponding time constant. Finally, a model temperature that matches the actual temperature is obtained, which is the catalyst model temperature.

[0098] In the technical solution disclosed in this embodiment, by electrically driving the vehicle during cold start and controlling the engine's idling, it is possible to avoid large fluctuations in the engine operating conditions while heating the catalyst, thereby reducing the increase in the engine's original emissions during cold start and reducing the content of harmful gases in the vehicle's tail exhaust.

[0099] In another embodiment, if Figure 3 As shown in the above Figure 2 Based on the embodiment shown, step S10 includes:

[0100] Step S11, when the vehicle meets the cold start condition, detecting whether a preset parking condition is met;

[0101] In this embodiment, when the vehicle meets cold start conditions, it detects in real time whether a preset parking condition is met. The preset parking condition indicates whether the vehicle should be parked. The preset parking condition may be a user-triggered parking command. The parking command may be triggered by the driver braking the vehicle, indicating that the driver has a parking requirement.

[0102] Step S12: When the preset parking condition is not met, connecting the transmission device of the vehicle to the motor of the vehicle to drive the vehicle through the motor.

[0103] In this embodiment, if the preset parking conditions are not met, the vehicle's transmission and motor may be connected to drive the vehicle via the motor, thereby satisfying the driver's driving needs. If the preset parking conditions are met, the step of connecting the vehicle's transmission and motor to drive the vehicle via the motor is not performed. Instead, upon receiving a request to start the engine, the engine and motor are connected and controlled to operate to charge a battery connected to the motor. This allows the engine to charge the battery when the vehicle is not moving, thereby converting gasoline consumed by the engine into electricity for the battery, reducing gasoline waste and improving fuel efficiency. Simultaneously, while the engine is charging the battery, the engine's exhaust continues to heat the catalyst, improving the catalyst's catalytic conversion efficiency. The request to start the engine can be triggered automatically, for example, upon detecting that the battery's state of charge (SOC) is below a threshold.

[0104] Optionally, when the parking conditions are met and a request to start the engine is received, the engine and the motor are connected. The current temperature of the vehicle's catalyst can be obtained at regular intervals, and the torque value corresponding to the current temperature can be obtained. The output torque of the engine to the motor can be adjusted according to the torque value corresponding to the current temperature, and the engine operation can be controlled to charge the battery. In this way, the engine load can be continuously adjusted with the catalyst temperature. For example, when the catalyst temperature is higher, the torque value corresponding to the catalyst temperature is greater, and the engine load is greater, thereby speeding up the heating speed of the catalyst.

[0105] Optionally, when obtaining the torque value corresponding to the current temperature, a table can be consulted based on the current catalyst temperature to determine the maximum allowable torque value corresponding to the current temperature. The output torque from the engine to the motor is then adjusted to the maximum allowable torque, which corresponds to the engine's optimal torque operating point for optimal economy. By maximizing engine operation at this optimal operating point, the catalyst heating rate is accelerated while avoiding excessive engine load that could degrade the vehicle's NVH (Noise, Vibration, and Harshness) performance.

[0106] In the technical solution disclosed in this embodiment, when the vehicle is cold-started, it is detected whether the preset parking conditions are met. If the preset parking conditions are not met, the vehicle is driven by electric drive to avoid the engine dragging the vehicle and causing the engine's original emissions to deteriorate.

[0107] In yet another embodiment, Figure 4 As shown, in Figures 2 to 3 Based on any embodiment, after step S40, the following steps are further included:

[0108] Step S50, upon receiving a torque increase request triggered by a user, adjusting the output torque of the motor to the transmission device according to the torque value corresponding to the torque increase request, and driving the motor via a battery connected to the motor;

[0109] In this embodiment, during the engine-driven phase, upon receiving a user-triggered torque increase request, the engine output torque is not increased based on the torque increase request. Instead, the vehicle is auxiliary driven by electric drive, with the power output from the motor to the transmission meeting the user's torque increase requirement. Specifically, upon receiving the torque increase request, the system detects whether the transmission is connected to the motor. If not, the system connects the motor to the transmission. If so, the system adjusts the torque output from the motor to the transmission based on the torque value corresponding to the torque increase request. The motor is then driven by a battery connected to the motor, converting the battery's electrical energy into kinetic energy through the motor, which is then output to the transmission to assist in driving the vehicle.

[0110] Optionally, when adjusting the output torque of the motor to the transmission device according to the torque value corresponding to the torque increase request, the torque value corresponding to the torque increase request can be an adjustment value, and the output torque of the motor to the transmission device is increased according to the adjustment value, thereby achieving the goal of maintaining the relative stability of the engine output torque while meeting the user's torque increase demand, ensuring that the engine load does not change drastically with the change of the user's requested torque, thereby avoiding fluctuations in the engine air-fuel ratio caused by drastic changes in the engine load, and minimizing the deterioration of the original emission.

[0111] Step S60 , when a torque reduction request triggered by a user is received, the output torque from the engine to the motor is adjusted according to the torque value corresponding to the torque reduction request, so as to charge the battery connected to the motor.

[0112] In this embodiment, when the vehicle is driven by the engine and a user-triggered torque reduction request is received, the engine output torque is not reduced in accordance with the torque reduction request. Instead, the engine charges the battery connected to the motor while the vehicle is driven, converting excess engine power into battery energy. This reduces the power output from the engine to the transmission and satisfies the user's torque reduction requirement. Specifically, upon receiving the torque reduction request, the system detects whether the engine and motor are connected. If not, the engine and motor are connected. If so, the engine output torque to the motor is adjusted according to the torque value corresponding to the torque reduction request to charge the battery connected to the motor and maintain a relatively stable engine load.

[0113] Optionally, when adjusting the output torque from the engine to the motor according to the torque value corresponding to the torque reduction request, the torque value corresponding to the torque reduction request can be an adjustment value, and the output torque from the engine to the motor is increased according to the adjustment value, thereby achieving the goal of maintaining the relative stability of the total output torque of the engine while meeting the user's torque reduction demand, ensuring that the engine load does not change drastically with the change of the user's requested torque, thereby avoiding fluctuations in the engine air-fuel ratio caused by drastic changes in the engine load, minimizing the deterioration of the original emission, and at the same time, maintaining the stability of the engine load, avoiding a reduction in the heating rate of the catalyst by the engine, and improving the heating rate of the catalyst.

[0114] In the technical solution disclosed in this embodiment, during the engine-driven stage, when the user requests an engine torque adjustment, the vehicle is driven by the motor or the engine load is shared by the motor to maintain the stability of the engine operating condition, thereby minimizing the original engine exhaust and maintaining the engine's heating speed for the catalyst.

[0115] In yet another embodiment, Figure 5 As shown, in Figures 2 to 4 Based on any embodiment, after step S40, the following steps are further included:

[0116] Step S70, upon receiving a torque adjustment request triggered by a user, obtaining the continuous running time of the engine;

[0117] In this embodiment, during the engine-on phase, the engine's running time is used to determine whether the catalyst has been fully heated. Different adjustments are applied to the engine's total output torque when the catalyst is fully heated and when it is not, minimizing the increase in engine exhaust emissions. Specifically, during the engine-on phase, if a user-triggered torque adjustment request is received, the engine's running time is obtained, and the adjustment method for the engine's total output torque is determined based on the engine's running time. It should be noted that during the engine-on phase, if the catalyst is not fully heated, the engine is not allowed to shut down. However, if the catalyst is fully heated, the engine can be shut down upon user request.

[0118] Step S80, when the continuous operation time is less than or equal to a preset time, obtaining a preset torque value corresponding to at least one of the temperature of the engine and the current temperature of the vehicle catalyst, and adjusting the total output torque of the engine to the transmission device and the motor according to the preset torque value;

[0119] In this embodiment, when the continuous operation time of the engine is less than or equal to the preset time, it indicates that the heating of the catalyst is not completed and the catalytic conversion efficiency of the catalyst has not reached the normal level. Therefore, a preset torque value corresponding to at least one of the engine temperature and the current temperature of the vehicle catalyst can be obtained, and the total output torque of the engine to the transmission device and the motor is adjusted according to the preset torque value, rather than adjusting the total output torque of the engine according to the torque adjustment request triggered by the user. The preset torque value is used to limit the engine torque to avoid a sharp change in the engine load with the change in the user's requested torque, thereby minimizing the original displacement of the engine.

[0120] Optionally, when obtaining a preset torque value corresponding to at least one of the engine temperature and the current temperature of the vehicle's catalyst, a table can be used to obtain the maximum allowable torque corresponding to at least one of the engine temperature and the current temperature of the vehicle's catalyst. The total output torque of the engine can be controlled to be no greater than the maximum allowable torque. For example, the total output torque of the engine can be maintained at the maximum allowable torque to reduce the increase in engine exhaust while increasing the engine's heating rate of the catalyst. For example, the maximum allowable torque corresponding to the engine and catalyst temperatures can be determined by querying the following table, where X is the engine temperature and Y is the catalyst temperature. For example, when the engine temperature is 30°C and the catalyst temperature is 300°C, the corresponding maximum allowable torque is 45 Nm.

[0121]

[0122] Step S90 : When the continuous operation time is greater than the preset time, adjusting the total output torque from the engine to the transmission device and the motor according to the torque value corresponding to the torque adjustment request.

[0123] In this embodiment, when the engine continues to run for longer than a preset time, it indicates that the catalyst has been heated and its catalytic conversion efficiency has reached a normal level, typically above 90%. Therefore, the engine's total output torque can be adjusted based on a user-triggered torque adjustment request. Specifically, the engine's total output torque is adjusted to the torque value corresponding to the torque adjustment request to meet the user's torque adjustment requirements.

[0124] Optionally, when the engine continues to run for longer than a preset time, the process may be terminated. Figure 4 The technical solution of driving the vehicle by assisting the motor or increasing the load of the engine on the motor by the motor in the illustrated embodiment restores the control method of the engine and the motor to the conventional control method of the vehicle.

[0125] Optionally, the preset duration can be determined based on test data of the vehicle in the NEDC fuel consumption cycle test and / or the WLTC emission cycle test. For example, the time interval from engine start to the first shutdown in the NEDC fuel consumption cycle test can be used as the preset duration to ensure that the catalytic conversion efficiency of the catalyst reaches a normal level.

[0126] In the technical solution disclosed in this embodiment, different control methods are used to adjust the total output torque of the engine when the catalyst is heated and when the catalyst is not heated, so as to minimize the increase in the original exhaust gas of the engine.

[0127] In addition, an embodiment of the present invention also proposes a vehicle control device, which includes: a memory, a processor, and a vehicle control program stored on the memory and runnable on the processor. When the vehicle control program is executed by the processor, the steps of the vehicle control method described in the above embodiments are implemented.

[0128] In addition, an embodiment of the present invention further provides a computer storage medium on which a vehicle control program is stored. When the vehicle control program is executed by a processor, the steps of the vehicle control method described in the above embodiments are implemented.

[0129] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0130] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0131] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0132] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vehicle control method, characterized in that: The vehicle control method comprises the following steps: When the vehicle meets a cold start condition, connecting the transmission device of the vehicle to the motor of the vehicle to drive the vehicle through the motor; controlling the engine of the vehicle to idle; Regularly obtain the current temperature of the vehicle's catalyst; When the current temperature satisfies a preset temperature condition, disconnecting the transmission device from the motor and connecting the transmission device to the engine to drive the vehicle via the engine; Upon receiving a torque adjustment request triggered by a user, obtaining a continuous running time of the engine; When the continuous operation time is less than or equal to a preset time, obtaining a preset torque value corresponding to at least one of the temperature of the engine and the current temperature of the vehicle catalyst, and adjusting the total output torque from the engine to the transmission device and the motor according to the preset torque value; When the continuous operation time is greater than the preset time, the total output torque from the engine to the transmission device and the motor is adjusted according to the torque value corresponding to the torque adjustment request.

2. The vehicle control method according to claim 1, wherein: The step of connecting the transmission device of the vehicle to the motor of the vehicle to drive the vehicle by the motor when the vehicle meets the cold start condition includes: When the vehicle meets the cold start condition, detecting whether a preset parking condition is met; When the preset parking condition is not satisfied, the transmission device of the vehicle is connected to the motor of the vehicle to drive the vehicle by the motor.

3. The vehicle control method according to claim 2, wherein: After the step of detecting whether the preset parking condition is met, the vehicle control method further includes: When the parking condition is satisfied and a request to start the engine is received, the engine and the motor are connected, and the engine is controlled to operate so as to charge a battery connected to the motor.

4. The vehicle control method according to claim 3, wherein: Before the step of controlling the operation of the engine, the method further includes: Regularly obtaining the current temperature of the vehicle catalyst; Obtaining a torque value corresponding to the current temperature; The output torque of the engine to the motor is adjusted according to the torque value corresponding to the current temperature.

5. The vehicle control method according to claim 1, wherein: When the current temperature satisfies a preset temperature condition, the step of disconnecting the transmission device from the motor and connecting the transmission device to the engine to drive the vehicle by the engine includes: When the current temperature satisfies the preset temperature condition, detecting whether the rotation speed of the engine matches the input shaft speed of the transmission device; When the engine speed matches the input shaft speed of the transmission, the transmission is disconnected from the motor and the transmission is connected to the engine to drive the vehicle through the engine. When the engine speed does not match the input shaft speed of the transmission, the engine speed is adjusted according to the input shaft speed, and the process returns to the step of detecting whether the engine speed matches the input shaft speed of the transmission.

6. The vehicle control method according to claim 1, wherein: Between the step of regularly acquiring the current temperature of the vehicle catalyst and the step of disconnecting the transmission device from the motor and connecting the transmission device to the engine to drive the vehicle by the engine when the current temperature meets a preset temperature condition, the method further includes: Obtaining a preset temperature of the vehicle catalyst; obtaining a heating index of the vehicle catalyst according to the current temperature and the preset temperature; It is determined whether the heating index is greater than or equal to a preset value, wherein when the heating index is greater than or equal to the preset value, it is determined that the current temperature meets a preset temperature condition.

7. A vehicle control device, characterized in that: The vehicle control device includes: a memory, a processor, and a vehicle control program stored in the memory and running on the processor. When the vehicle control program is executed by the processor, the steps of the vehicle control method according to any one of claims 1 to 6 are implemented.

8. A computer storage medium, characterized in that The computer storage medium stores a vehicle control program, which, when executed by a processor, implements the steps of the vehicle control method according to any one of claims 1 to 6.

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