Engine control method and vehicle
By dividing the engine starting process into multiple stages and using the vehicle controller to select the appropriate control method, the problem of inaccurate engine starting control in hybrid vehicles is solved, achieving a smoother starting process and a more comfortable user experience.
Patent Information
- Application Number
- CN202510738536.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-04
- Publication Date
- 2025-09-09
AI Technical Summary
The engine starting control method of hybrid vehicles has the problem of inaccurate control, resulting in poor power, economy and drivability.
By dividing the engine starting process into three stages: dragging the engine, power source speed synchronization and clutch engagement, the vehicle controller is used to select different engine control methods according to vehicle status parameters and operating modes to ensure the accuracy and smoothness of the engine starting process.
It improves the accuracy and smoothness of engine starting control, reduces vibration at the moment of starting, and improves user comfort and vehicle economy.
Smart Images
Figure CN120606812A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of electronic technology, and specifically relates to an engine control method and a vehicle. Background Art
[0002] Hybrid vehicles are vehicles that derive their power from at least two power sources (e.g., an engine and an electric motor). Compared to traditional vehicles, hybrid vehicles utilize different engine start control methods due to the inclusion of a drive motor and a power battery. Therefore, it is necessary to develop reasonable and effective control strategies and algorithms to achieve better engine start control, thereby improving the vehicle's power, economy, and drivability. For example, a sensor could be positioned in front of the vehicle to determine the relative distance and speed between the vehicle and the target vehicle ahead, thereby optimizing the number of engine starts and operating range, thereby improving the vehicle's overall efficiency and comfort. However, current hybrid vehicle engine start control methods suffer from inaccurate control. Summary of the Invention
[0003] In view of this, the purpose of the present application is to provide an engine control method and a vehicle to improve the problem of inaccurate control in the current engine starting control method of a hybrid vehicle.
[0004] The embodiment of the present application is implemented as follows: In a first aspect, an embodiment of the present application provides an engine control method, which is applied to a vehicle controller in a vehicle, wherein the vehicle controller is connected to the engine, motor, and gearbox in the vehicle, respectively; the clutch in the vehicle is connected to the engine and motor, respectively; and the gearbox is connected to the motor. The method includes: when the engine is stopped, judging whether the vehicle meets the engine start triggering conditions based on the vehicle system state parameters; when the vehicle meets the engine start triggering conditions, controlling the engine fuel supply and controlling the engine speed to increase from zero to a first speed, wherein the first speed is the gearbox input shaft speed, the gearbox input shaft speed maximum threshold value, and the engine idle target speed; when the engine speed reaches the first speed, the engine speed is controlled to be synchronized with the speed of the motor according to the engine control mode corresponding to the operation mode of the vehicle and the working mode of the motor; when the engine speed is synchronized with the speed of the motor and the vehicle meets a preset first condition, the engine speed is controlled to be a second speed, so that the engine drives the active disc and the driven disc of the clutch to engage, completing the engine starting process, wherein the second speed is the maximum value of the motor current speed, the maximum threshold value of the gearbox input shaft speed, and the engine idle target speed.
[0005] In the above embodiment, by dividing the vehicle starting process into three stages: dragging the engine (i.e., controlling the engine fuel supply and controlling the engine speed to increase from zero to a first speed), power source speed synchronization, and clutch engagement, and selecting different engine control methods in each stage according to different vehicle conditions, the accuracy of engine starting control can be improved, thereby ensuring a smoother engine starting process and reducing vibration caused by the starting moment, thereby providing users with a more comfortable experience.
[0006] In combination with a possible implementation manner of the first aspect embodiment, the engine speed is controlled to be synchronized with the speed of the motor according to the engine control method corresponding to the operating mode of the vehicle and the working mode of the motor, including: when the operating mode of the vehicle is a non-driving mode and the working mode of the motor is a non-speed control mode, the engine speed is controlled to be the engine idle target speed, so that the engine speed is synchronized with the speed of the motor; or, when the operating mode of the vehicle is a driving mode and / or the working mode of the motor is a speed control mode, the output torque of the engine is controlled to be a first torque, so that the engine speed is synchronized with the speed of the motor, wherein the first torque is the sum of the second torque and the third torque; the second torque is the adjustment torque obtained according to the difference between the current speed of the motor and the current speed of the engine, and the third torque is the torque compensation value obtained according to the current torque of the motor and the gear position of the gearbox.
[0007] In the above embodiment, during the power source speed synchronization stage of engine starting, the engine speed control (i.e., controlling the engine speed to the engine idle target speed) or torque control (i.e., controlling the engine output torque to the first torque) is selected according to the vehicle operation mode and the motor working mode. This not only meets the vehicle's economy and efficiency requirements, but also achieves precise control of the engine, ensures smooth starting, reduces vibration during starting, and thus provides users with a more comfortable experience.
[0008] In combination with a possible implementation manner of the first aspect, the method further includes: when the vehicle does not meet the preset first condition, controlling the output torque of the engine to be a fourth torque, so that the engine drives the active disc and the driven disc of the clutch to engage, completing the starting process of the engine, wherein the fourth torque is the minimum value of the engine torque distribution value and the clutch transmittable torque value.
[0009] In the above embodiment, during the clutch engagement stage of engine starting, when the vehicle does not meet the preset first condition, the engine torque is controlled, which can reduce vibration and impact on the engine, ensure the smoothness of starting, and thus provide users with a more comfortable experience.
[0010] In combination with a possible implementation manner of the embodiment of the first aspect, the vehicle system status parameters include the start-stop prohibition switch status, the signal sending status of the air conditioning and heating system, the brake vacuum, the power battery level, the power battery temperature, the engine coolant temperature, the road slope, the vehicle coasting speed, the battery available power, the motor allowable power, the brake pedal status, the vehicle gear position, and the brake master cylinder pressure; the engine start triggering condition includes at least one of the following conditions: the start-stop prohibition switch is in the pressed state; the engine start prohibition signal sent by the air conditioning and heating system is not obtained; the brake vacuum is insufficient; the power battery level is insufficient; the power battery temperature meets the power battery power requirement required for the engine start; the engine coolant temperature meets the economy requirement of the engine start; the road The road slope is greater than or equal to a preset first value; the vehicle coasting speed is greater than a preset second value; the battery available power meets the battery available power requirement required for the engine starting; the motor allowable power meets the motor allowable power requirement required for the engine starting; the brake pedal state, the vehicle gear, and the brake master cylinder pressure meet the preset first vehicle operating state condition; wherein, the preset first vehicle operating state condition includes any of the following conditions: the vehicle gear is a non-parking gear and the brake pedal is in a released state; the vehicle gear is a parking gear and the brake pedal is in a stepped state; the vehicle gear is a reverse gear and the vehicle remains in the reverse gear for a preset first time length; the vehicle gear is a non-parking gear, the brake pedal is in a stepped state, and the brake master cylinder pressure is greater than a preset third value.
[0011] In the above embodiment, the vehicle is allowed to start only when the vehicle system status parameters meet the engine start trigger conditions. This not only optimizes the working conditions of the engine start and reduces the impact load on the engine, transmission and other components; it also ensures that the engine start timing is appropriate to meet the economic requirements of the vehicle start; in addition, it can also ensure the smoothness of the engine starting process, reduce vehicle vibration, and provide users with a more comfortable experience. In combination with a possible implementation manner of the first aspect embodiment, before judging whether the vehicle meets the engine start trigger conditions based on the vehicle system status parameters, the method also includes: determining that the vehicle power system status and start-stop status, and vehicle safety status parameters all meet the engine start prerequisites.
[0012] In the above embodiment, only when the vehicle power system status, start-stop status, and vehicle safety status parameters all meet the engine start prerequisites, is it determined whether the vehicle meets the engine start trigger conditions based on the vehicle system status parameters. This not only ensures the safety of the starting process, but also improves the success rate and reliability of the start.
[0013] In combination with a possible implementation manner of the embodiment of the first aspect, the method also includes: when the engine is started, judging whether the vehicle meets the engine shutdown trigger condition based on the vehicle operating status information; when the vehicle meets the engine shutdown trigger condition, controlling the engine fuel supply and controlling the engine's output torque to drop to a preset first torque according to a preset slope; wherein the preset first torque is a negative torque; controlling the engine's output torque to drop from the preset first torque to zero, so that the engine drives the active disc and the driven disc of the clutch to disconnect; when the active disc and the driven disc of the clutch are disconnected, controlling the engine's output torque to be zero, and sending a stop fuel supply and shutdown signal to the engine to complete the engine shutdown process.
[0014] In the above embodiment, by dividing the vehicle shutdown process into three stages: power source torque reduction (i.e., controlling the engine fuel supply and controlling the engine's output torque to drop to a preset first torque according to a preset slope), clutch disconnection, and engine fuel cut-off shutdown, and performing different control on the engine in each stage according to different vehicle conditions, the accuracy of the engine shutdown control can be improved, thereby ensuring a smoother engine shutdown process and reducing vibrations generated during the shutdown process, thereby providing users with a more comfortable experience.
[0015] In combination with a possible implementation manner of the first aspect, the vehicle operating status information includes vehicle speed, vehicle gear, brake pedal status, and brake master cylinder pressure; the engine shutdown trigger condition includes at least one of the following conditions: the vehicle speed meets the preset fourth value; the vehicle gear, the brake pedal status, and the brake master cylinder pressure meet the preset second vehicle operating status condition; wherein, the preset second vehicle operating status condition includes any one of the following conditions: the vehicle gear is the parking gear; the vehicle gear is the non-parking gear, the brake pedal is in a stepped state, and the brake master cylinder pressure is greater than the preset fifth value; the vehicle gear is the reverse gear and the time the vehicle is in the reverse gear is greater than the preset second time length, and the forward speed of the vehicle after parking is greater than the preset first speed. Whether the engine shutdown is triggered is determined based on the engine shutdown trigger condition.
[0016] In the above embodiment, the vehicle is allowed to shut down only when the vehicle operating status information meets the engine shutdown trigger conditions. This not only ensures the rationality of the shutdown timing and reduces the stress and wear of components such as the transmission and clutch caused by the engine shutdown; it also ensures that the vehicle's power system is smoothly connected before and after the shutdown, reduces obvious shaking, jerking, etc. in the vehicle due to sudden engine shutdown, thereby providing users with a more comfortable experience.
[0017] In conjunction with a possible implementation manner of the embodiment of the first aspect, before determining whether the vehicle meets the engine shutdown trigger condition based on the vehicle operating state information, the method further includes: Determine whether the vehicle safety status parameters, power system status parameters, electrical and energy system status parameters, and vehicle external condition parameters all meet the engine shutdown prerequisites.
[0018] In the above embodiment, only when the vehicle safety status parameters, power system status parameters, electrical and energy system status parameters, and vehicle external condition parameters all meet the engine shutdown prerequisites, is it determined whether the vehicle meets the engine shutdown trigger conditions based on the vehicle operating status information. This not only ensures the safety of the shutdown, but also enhances the stability of the vehicle system, thereby allowing the shutdown process to proceed smoothly. In addition, it can also reduce the jitter that occurs during the shutdown process and improve the smoothness of the engine shutdown process, thereby providing users with a more comfortable experience.
[0019] In a second aspect, an embodiment of the present application provides an engine control method, which is applied to a vehicle controller in a vehicle, wherein the vehicle controller is connected to the engine in the vehicle, and the clutch in the vehicle is connected to the engine. The method includes: when the engine is started, judging whether the vehicle meets the engine shutdown trigger condition based on the vehicle operating status information; when the vehicle meets the engine shutdown trigger condition, controlling the engine fuel supply and controlling the engine's output torque to drop to a preset first torque according to a preset slope; wherein the preset first torque is a negative torque; controlling the engine's output torque to drop from the preset first torque to zero, so that the engine drives the active disc and the driven disc of the clutch to disconnect; when the active disc and the driven disc of the clutch are disconnected, controlling the engine's output torque to be zero, and sending a stop fuel supply and shutdown signal to the engine to complete the engine shutdown process.
[0020] In a third aspect, an embodiment of the present application provides a vehicle comprising: an engine, a motor, a gearbox, a clutch, and a vehicle controller; a gearbox connected to the motor; a clutch connected to the engine and the motor respectively; a vehicle controller connected to the engine, the motor, and the gearbox respectively; the vehicle controller is used to execute the method provided in the above-mentioned first aspect embodiment and / or any possible implementation method in combination with the first aspect embodiment; or to execute the method provided in the above-mentioned second aspect embodiment.
[0021] Other features and advantages of the present application will be described in the following description. The purpose and other advantages of the present application can be realized and obtained through the structures specifically pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can also obtain other drawings based on these drawings. The above and other purposes, features, and advantages of the present application will be more clearly illustrated through the drawings.
[0023] Figure 1 A structural schematic diagram of a vehicle provided in an embodiment of the present application is shown.
[0024] Figure 2 A structural schematic diagram of another vehicle provided in an embodiment of the present application is shown.
[0025] Figure 3 A flow chart of an engine control method provided in an embodiment of the present application is shown.
[0026] Figure 4 A schematic diagram showing the principle of an engine control method provided in an embodiment of the present application is shown.
[0027] Figure 5 A flow chart of another engine control method provided in an embodiment of the present application is shown. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following embodiments can be used as examples to more clearly illustrate the technical solutions of the present application, and are not intended to limit the scope of protection of the present application. It will be understood by those skilled in the art that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other.
[0029] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures. At the same time, in the description of this application, relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0030] Furthermore, the term "and / or" in this application is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.
[0031] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, the technical term "connection" may refer to a direct connection or an indirect connection through an intermediate medium.
[0032] An embodiment of the present application provides an engine control method, which selects different engine control methods according to the conditions at different stages of engine starting, thereby improving the accuracy of engine starting control, thereby ensuring a smoother engine starting process and reducing vibrations caused by the starting moment, thereby providing users with a more comfortable experience.
[0033] The embodiment of the present application provides a vehicle, such as Figure 1 As shown, the vehicle includes an engine, a motor, a gearbox, a clutch and a vehicle controller (HCU, Hybrid Control Unit); the gearbox is connected to the motor; the clutch is connected to the engine and the motor respectively; the vehicle controller is connected to the engine, the motor and the gearbox respectively.
[0034] The vehicle controller is used to determine whether the vehicle meets the engine start trigger conditions based on the vehicle system status parameters when the engine is stopped; when the vehicle meets the engine start trigger conditions, control the engine fuel supply and control the engine speed to increase from zero to a first speed; when the engine speed reaches the first speed, control the engine speed to be synchronized with the motor speed based on the vehicle's operating mode and the engine control method corresponding to the motor's working mode; when the engine speed is synchronized with the motor speed and the vehicle meets the preset first condition, control the engine speed to be the second speed, so that the engine drives the active plate and the driven plate of the clutch to engage, completing the engine starting process.
[0035] Among them, the vehicle system status parameters include the start-stop prohibition switch status, the signal sending status of the air conditioning and heating systems, the brake vacuum, the power battery power, the power battery temperature, the engine coolant temperature, the road slope, the vehicle coasting speed, the battery available power, the motor allowable power, the brake pedal status, the vehicle gear, and the brake master cylinder pressure.
[0036] Brake vacuum refers to the difference between the pressure in the vacuum chamber of a vehicle's vacuum booster and atmospheric pressure; it reflects the operating status of the vehicle's vacuum booster. The power battery is a core component of the vehicle's energy system, providing power for the vehicle's electric drive system. The power battery can be controlled by a battery management system. The BMS (Battery Management System) is an indispensable core component in the power battery system, primarily responsible for controlling and managing multiple aspects of the power battery, including charging, discharging, status monitoring, balancing management, safety protection, and thermal management.
[0037] Vehicle coasting speed is the speed a vehicle can reach when coasting freely on a straight, dry, clean road surface, with the engine turned off (or no power applied), relying solely on its own inertia. It reflects the vehicle's ability to maintain forward motion through its own inertia at a given initial speed. Battery usable power refers to the maximum power a battery can provide or receive under its current conditions. It is a key parameter for measuring battery performance and application capabilities. Motor allowable power refers to the maximum power a motor can continuously operate at under normal operating conditions without exceeding its maximum operating temperature, mechanical strength, and other safety limits.
[0038] The engine start triggering conditions include at least one of the following conditions: the start-stop inhibit switch is in the pressed state; the engine start inhibit signal sent by the air conditioning and heating system is not obtained; the brake vacuum is insufficient; the power battery is insufficient; the power battery temperature meets the power battery power requirement required for engine start; the engine coolant temperature meets the economy requirement for engine start; the road slope is greater than or equal to the preset first value; the vehicle coasting speed is greater than the preset second value; the battery available power meets the battery available power requirement required for engine start; the motor allowable power meets the motor allowable power requirement required for engine start; the brake pedal status, vehicle gear position, and brake master cylinder pressure meet the preset first vehicle operating status conditions.
[0039] Insufficient brake vacuum refers to a brake vacuum less than or equal to a preset sixth value, for example, the sixth value can be set to 0.6 MPa. Insufficient power battery charge refers to a remaining power battery charge less than or equal to a preset seventh value, for example, the seventh value can be set to 35%. Power battery temperature meeting the power battery power requirements for engine starting refers to a power battery temperature less than or equal to a preset eighth value, ensuring the power battery can provide sufficient power to meet the power requirements of the engine starting. For example, the eighth value can be set to 10°C.
[0040] The engine coolant temperature meeting the economy requirements for engine starting means that in order to meet the economy requirements, the coolant temperature when the engine is started should be less than or equal to the preset ninth value to ensure that the engine can quickly reach the optimal operating temperature after starting; for example, the ninth value can be set to 65°C. The first value can be set to 10%. The second value can be set to 3km / h. The battery available power requirement required for engine starting means that the battery power must be less than or equal to the preset tenth value. For example, the tenth value can be set to 5kW. The motor allowable power requirement required for engine starting means that the motor power must be less than or equal to the preset eleventh value. For example, the eleventh value can be set to 5kW.
[0041] Among them, the preset first vehicle operating status condition includes any of the following conditions: the vehicle gear is in a non-parking gear and the brake pedal is in a released state; the vehicle gear is in a parking gear and the brake pedal is in a stepped state; the vehicle gear is in a reverse gear and the vehicle remains in the reverse gear for a preset first period of time; the vehicle gear is in a non-parking gear, the brake pedal is in a stepped state and the brake master cylinder pressure is greater than a preset third value.
[0042] The first duration may be set to 1 second; the third value may be set to 20 bar.
[0043] The process of increasing the engine speed from zero to the first speed is called the engine dragging phase. During this phase, the motor is used to drag the engine to start, and the engine speed is controlled. At this point, the vehicle controller sends a signal to the engine to output zero torque. The first speed is the maximum of the transmission input shaft speed, the transmission input shaft speed maximum threshold, and the engine idle target speed. The transmission input shaft speed maximum threshold can be set to 900 rpm.
[0044] During the power source speed synchronization stage (i.e., the engine speed is synchronized with the motor speed) and the clutch engagement stage, the vehicle controller controls the engine fuel supply.
[0045] The preset first condition includes at least one of the following: the vehicle's operating mode is non-driving mode and the motor cannot perform speed control; the vehicle's operating mode is non-driving mode and the clutch torque is less than a preset twelfth value. The preset twelfth value can be set to an engine torque control threshold, such as 50 Nm. If the vehicle meets the preset first condition, the engine is controlled to perform speed control. The second speed is the maximum of the current motor speed, the maximum threshold value of the transmission input shaft speed, and the target engine idle speed.
[0046] By dividing the vehicle starting process into three stages: dragging the engine, synchronizing the power source speed, and engaging the clutch, and selecting different engine control methods in each stage according to the different conditions of the vehicle, the accuracy of the engine starting control can be improved, thereby ensuring a smoother engine starting process and reducing vibration caused by the starting moment, thereby providing users with a more comfortable experience.
[0047] In one possible implementation manner, the vehicle controller is specifically used to control the engine speed to the engine idle target speed when the vehicle's operating mode is a non-driving mode and the motor's operating mode is a non-speed control mode, so that the engine speed is synchronized with the motor speed; or, when the vehicle's operating mode is a driving mode and / or the motor's operating mode is a speed control mode, control the engine's output torque to a first torque, so that the engine speed is synchronized with the motor speed.
[0048] When the vehicle's operating mode is non-driving mode and the motor's operating mode is non-speed control mode, the engine is controlled to perform speed control. When the vehicle's operating mode is driving mode and / or the motor's operating mode is speed control mode, the engine is controlled to perform torque control.
[0049] In the above embodiment, the first torque is the sum of the second torque and the third torque; the second torque is the adjustment torque obtained according to the difference between the current speed of the motor and the current speed of the engine, and the third torque is the torque compensation value obtained according to the current torque of the motor and the gear position of the gearbox.
[0050] During the power source speed synchronization stage of engine starting, the engine speed control or torque control is selected according to the vehicle's operating mode and the motor's working mode. This not only meets the vehicle's economic and efficiency requirements, but also achieves precise control of the engine, ensures smooth starting, and reduces vibration during starting, thereby providing users with a more comfortable experience.
[0051] In one possible implementation, the vehicle controller is also used to control the engine's output torque to a fourth torque when the vehicle does not meet the preset first condition, so that the engine drives the active plate and the driven plate of the clutch to engage, completing the engine starting process.
[0052] In the above embodiment, if the vehicle does not meet the first preset condition, the engine is controlled to perform torque control. The fourth torque is the minimum of the engine torque distribution value and the clutch transmittable torque value. The engine torque distribution value and the clutch transmittable torque value are calculated internally by the vehicle controller.
[0053] During the clutch engagement stage of engine starting, if the vehicle does not meet the preset first condition, engine torque control can reduce vibration and impact on the engine, ensure smooth starting, and thus provide users with a more comfortable experience.
[0054] In one possible implementation, the vehicle controller is also used to determine whether the vehicle power system state, start-stop state, and vehicle safety state parameters all meet the engine starting prerequisites.
[0055] The vehicle's powertrain status and start / stop status may include the engine operating status, motor operating status, battery operating status, transmission signal transmission status, and the number of engine start failures. Vehicle safety status parameters may include the status of the hood, driver's door, and driver's seatbelt. Engine start prerequisites include the following: no engine faults; no motor faults; no battery faults; no transmission signal prohibiting engine start; the number of engine start failures during the current driving process is less than a preset thirteenth value (e.g., two); the hood is closed; the driver's door is closed; and the driver's seatbelt is fastened.
[0056] The number of engine start failures refers to the number of times the engine fails to start during this driving process.
[0057] In one possible implementation manner, the vehicle controller is also used to determine whether the vehicle meets the engine shutdown trigger condition based on the vehicle operating status information when the engine is started; when the vehicle meets the engine shutdown trigger condition, control the engine fuel supply and control the engine output torque to drop to a preset first torque according to a preset slope; control the engine output torque from the preset first torque to zero, so that the engine drives the active disc and the driven disc of the clutch to disconnect; when the active disc and the driven disc of the clutch are disconnected, control the engine output torque to zero, and send a stop fuel supply and shutdown signal to the engine to complete the engine shutdown process.
[0058] The vehicle operating status information includes vehicle speed, vehicle gear position, brake pedal status, and brake master cylinder pressure. The engine shutdown triggering condition includes at least one of the following: the vehicle speed meets a preset fourth value; the vehicle gear position, brake pedal status, and brake master cylinder pressure meet a preset second vehicle operating status condition. For example, the fourth value can be set to zero, and the vehicle speed meeting the fourth value means that the vehicle speed is very low, close to zero. Among them, the preset second vehicle operating status condition includes any of the following conditions: the vehicle gear is the parking gear; the vehicle gear is the non-parking gear, the brake pedal is in the stepped state and the brake master cylinder pressure is greater than the preset fifth value; the vehicle gear is the reverse gear and the time the vehicle is in the reverse gear is greater than the preset second time length, and the forward speed of the vehicle after parking is greater than the preset first speed. Whether to trigger the engine shutdown is determined according to the engine shutdown trigger condition.
[0059] The fifth value can be set to 30 bar. The second duration can be set to 1 second. The first vehicle speed can be set to 10 km / h. If the vehicle is in reverse gear and has been in reverse gear for longer than the preset second duration, and the vehicle's forward speed after stopping is greater than the preset first speed, the engine shutdown trigger condition determines whether to trigger the engine shutdown. This is intended to prevent the engine shutdown from being accidentally triggered while the vehicle is reversing.
[0060] In the above-described embodiment, during the power source torque reduction phase when the engine is shut down, the engine is controlled to perform torque control (i.e., the engine's output torque is controlled to decrease to a preset first torque according to a preset slope). During the power source torque reduction phase, the engine output torque gradually decreases; the purpose of reducing the output torque to the preset first torque according to the preset slope is to avoid large fluctuations in numerical control. The preset first torque is a negative torque, and setting the first torque to a negative value is to reduce the engine torque as quickly as possible; for example, the first torque can be set to -10Nm. Negative torque means that the engine is generating a torque in the opposite direction of normal power output. During the clutch disengagement phase, the vehicle controller controls the engine fuel supply.
[0061] In one possible implementation, the vehicle controller is also used to determine whether the vehicle safety status parameters, power system status parameters, electrical and energy system status parameters, and vehicle external condition parameters all meet the engine shutdown prerequisites.
[0062] Vehicle safety status parameters include the status of the hood, driver's door, and driver's seatbelt. Powertrain status parameters include engine operating status, motor operating status, transmission signal transmission status, and engine coolant temperature. Electrical and energy system status parameters include battery operating status, power battery charge, power battery temperature, battery available power, and motor allowable power. Vehicle external condition parameters include the signal transmission status of the air conditioning and heating systems, steering wheel angle, vehicle speed since the last engine shutdown, start / stop inhibit switch status, road grade, and brake vacuum.
[0063] The prerequisites for engine shutdown include the following conditions: the engine hood is closed; the driver's side door is closed; the driver's side seat belt is fastened; the engine has no faults; the motor has no faults; the engine start-up prohibition signal sent by the transmission is not obtained; the engine coolant temperature meets the economy requirements for the next engine start; the battery has no obstructions; the power battery is sufficiently charged; the power battery temperature meets the power battery power requirements required for engine shutdown; the battery available power meets the power requirements for the next engine start; the motor allowable power meets the power requirements for the next engine start; the engine shutdown prohibition signal sent by the air conditioning and heating system is not obtained; the steering wheel angle is less than the preset fourteenth value; the vehicle's driving speed after the last engine shutdown is greater than the preset fifteenth value and continues for the preset third time period; the start-stop prohibition switch is in the released state; the road slope meets the safety requirements for parking the vehicle; the brake vacuum is sufficient.
[0064] Among them, "the engine coolant temperature meets the economy requirements for the next engine start" means that, in order to meet the economy requirements, the coolant temperature should be greater than the preset ninth value when the engine is stopped. "Sufficient power battery charge" means that the remaining power battery charge is greater than the preset seventh value. "The power battery temperature meets the power battery power requirements for engine shutdown" means that the power battery temperature is greater than the preset eighth value, ensuring that the power battery can provide sufficient power to meet the power requirements when the engine is stopped. "The power requirement for the next engine start" means that the battery power must be greater than the preset tenth value. "The power requirement for the next engine start" means that the motor power must be greater than the preset eleventh value. "The fourteenth value" can be set to 270 degrees. "The fifteenth value" can be set to 5 km / h. "The third duration" can be set to 10 seconds to avoid frequent starts and stops in congested urban areas. "The vehicle parking safety requirement" means that the road slope is less than the preset first value. "Sufficient brake vacuum" means that the brake vacuum is greater than the preset sixth value.
[0065] In addition, the vehicle also includes sensors for obtaining vehicle-related parameters. The sensors are connected to the vehicle controller via the CAN network (Controller Area Network), allowing the vehicle controller to obtain data collected by the sensors or generate control signals based on logical judgments based on the data collected by the sensors. For example, the vehicle controller can obtain brake vacuum, power battery charge, and power battery temperature through the CAN network. Vehicle-related parameters may include vehicle system status parameters, vehicle power system status and start-stop status, vehicle safety status parameters, vehicle operating status information, power system status parameters, electrical and energy system status parameters, and vehicle external condition parameters. Among them, the CAN network is a serial communication protocol commonly used in automobiles and industrial equipment.
[0066] In the embodiments of the present application, the numerical values given are only exemplary and are not intended to limit the corresponding values. The specific values can be determined based on actual conditions.
[0067] In one possible implementation, Figure 2 As shown, in addition to the engine, motor, gearbox, clutch, and vehicle controller, the vehicle also includes an engine controller (EMS, Engine Management System), a motor controller (MCU, Motor Control Unit), and a gearbox controller (TCU, Transmission Control Unit); the engine is connected to the engine controller and clutch respectively; the motor is connected to the clutch, gearbox, and motor controller respectively; the gearbox is connected to the gearbox controller; and the vehicle controller is connected to the engine controller, motor controller, and gearbox controller respectively.
[0068] The motor controller controls the motor; the engine controller controls the engine; and the transmission controller controls the transmission. The motor controller, engine controller, transmission controller, and vehicle controller communicate via the CAN network. The vehicle controller is used to determine whether the vehicle meets the engine start triggering conditions based on the vehicle system status parameters when the engine is stopped; when the vehicle meets the engine start triggering conditions, the engine output fuel supply signal is sent to the engine controller, and the engine controller controls the engine fuel supply after receiving the engine output fuel supply signal; at the same time, the engine speed control signal is sent to the engine controller, and the engine controller controls the engine to adopt speed control after receiving the engine speed control signal; when the engine speed is controlled, the first engine speed output signal is sent to the engine controller, and the engine controller controls the engine speed to increase from zero to the first speed after receiving the first engine speed output signal; when the engine When the speed reaches a first speed, the engine speed is controlled to be synchronized with the motor speed according to the vehicle's operating mode and the engine control method corresponding to the motor's working mode; when the engine speed is synchronized with the motor speed and the vehicle meets a preset first condition, an engine speed control instruction is sent to the engine controller, and the engine controller controls the engine to adopt speed control after receiving the engine speed control instruction. During the engine speed control, a second engine speed output signal is sent to the engine controller, and the engine controller controls the engine speed to be a second speed after receiving the second engine speed output signal, so that the engine drives the active plate and the driven plate of the clutch to engage, completing the engine starting process.
[0069] Vehicle system status parameters include the start / stop inhibit switch status, air conditioning and heating system signal transmission status, brake vacuum, power battery charge, power battery temperature, engine coolant temperature, road slope, vehicle coasting speed, battery available power, motor allowable power, brake pedal status, vehicle gear position, and brake master cylinder pressure. Engine start triggering conditions include at least one of the following: the start / stop inhibit switch is pressed; the air conditioning and heating system signal to inhibit engine start is not received; insufficient brake vacuum; insufficient power battery charge; the power battery temperature meets the power battery power requirement for engine start; the engine coolant temperature meets the economy requirement for engine start; the road slope is greater than or equal to a preset first value; the vehicle coasting speed is greater than a preset second value; the battery available power meets the battery available power requirement for engine start; the motor allowable power meets the motor allowable power requirement for engine start; and the brake pedal status, vehicle gear position, and brake master cylinder pressure meet a preset first vehicle operating state condition. The engine system includes an engine and an engine controller.
[0070] During the engine dragging phase, the vehicle controller sends a first engine torque output signal to the engine controller. Upon receiving the first engine torque output signal, the engine controller controls the engine output torque to zero. The torque in the first engine torque output signal is zero. The engine speed in the first engine speed output signal is a first speed. The first speed is the maximum of the transmission input shaft speed, the transmission input shaft speed maximum threshold, and the engine idle target speed. The transmission input shaft speed can be obtained by the transmission controller. The engine idle target speed can also be obtained by the engine controller.
[0071] During the power source speed synchronization stage and the clutch engagement stage, the vehicle controller sends an engine output fuel supply signal to the engine controller, and the engine controller controls the engine fuel supply after receiving the engine output fuel supply signal.
[0072] The engine speed in the second engine speed output signal is the second speed. The second speed is the maximum of the current motor speed, the maximum threshold value of the transmission input shaft speed, and the target engine idle speed. The current motor speed can be obtained from a signal sent by the motor controller.
[0073] In one possible implementation manner, the vehicle controller is specifically used to send an engine speed control signal to the engine controller when the vehicle's operating mode is a non-drive mode and the motor's working mode is a non-speed control mode, and the engine controller controls the engine to adopt speed control after receiving the engine speed control signal; when the engine adopts speed control, send a third engine speed output signal to the engine controller, and the engine controller controls the engine speed to the engine idle target speed after receiving the third engine speed output signal, so that the engine speed is synchronized with the motor speed; or, when the vehicle's operating mode is a drive mode and / or the motor's working mode is a speed control mode, send an engine torque control signal to the engine controller, and the engine controller controls the engine to adopt torque control after receiving the engine torque control signal; when the engine adopts torque control, send a second engine torque output signal to the engine controller, and the engine controller controls the engine's output torque to the first torque after receiving the second engine torque output signal, so that the engine speed is synchronized with the motor speed.
[0074] The engine speed in the third engine speed output signal is the target engine idle speed. The torque in the second engine torque output signal is the first torque. The first torque is the sum of the second and third torques. The second torque is the adjustment torque derived from the difference between the current motor speed and the current engine speed. The third torque is the torque compensation value derived from the current motor torque and the transmission gear position. The adjustment torque can be obtained by the motor controller; the torque compensation value can be obtained by the transmission controller.
[0075] In one possible implementation manner, the vehicle controller is also used to send an engine torque control signal to the engine controller when the vehicle does not meet a preset first condition, and the engine controller controls the engine to adopt torque control after receiving the engine torque control signal; when the engine adopts torque control, a third engine torque output signal is sent to the engine controller, and the engine controller controls the output torque of the engine to be a fourth torque after receiving the third engine torque output signal, so that the engine drives the active plate and the driven plate of the clutch to engage, completing the engine starting process.
[0076] The torque in the third engine torque output signal is the fourth torque.
[0077] In one possible implementation, the vehicle controller is also used to determine whether the vehicle power system state, start-stop state, and vehicle safety state parameters all meet the engine starting prerequisites.
[0078] The vehicle's powertrain status and start / stop status may include the engine system operating status, motor system operating status, battery system operating status, transmission signal transmission status, and the number of engine start failures. Vehicle safety status parameters may include the status of the hood, driver's door, and driver's seatbelt. Engine start prerequisites include the following: no engine system faults; no motor system faults; no battery system faults; no transmission signal prohibiting engine system start; the number of engine start failures during the current driving period is less than a preset thirteenth value; the hood is closed; the driver's door is closed; and the driver's seatbelt is fastened.
[0079] The motor system includes a motor and a motor controller, while the battery system includes a power battery and a battery management system.
[0080] In one possible embodiment, the vehicle controller is further configured to, when the engine is started, determine whether the vehicle meets an engine shutdown trigger condition based on vehicle operating status information; if the vehicle meets the engine shutdown trigger condition, send an engine output fuel supply signal to the engine controller, which controls the engine fuel supply after receiving the engine output fuel supply signal; simultaneously send an engine torque control signal to the engine controller, which controls the engine to adopt torque control after receiving the engine torque control signal; during engine torque control, send a fourth engine torque output signal to the engine controller, which controls the engine output torque to decrease to a preset first torque according to a preset slope after receiving the fourth engine torque output signal; send a fifth engine torque output signal to the engine controller, which controls the engine output torque to decrease from the preset first torque to zero after receiving the fifth engine torque output signal, thereby disconnecting the driving plate and the driven plate of the clutch driven by the engine; and if the driving plate and the driven plate of the clutch are disconnected, send a sixth engine torque output signal to the engine controller, which controls the engine output torque to zero after receiving the sixth engine torque output signal, and sends an engine no-fuel-supply output signal and an engine fuel-cut-off shutdown signal to the engine controller to complete the engine shutdown process.
[0081] In the above embodiment, before the vehicle controller sends the engine output fuel supply signal to the engine controller, it receives the engine torque signal from the engine controller. This engine torque signal represents the real-time monitored actual engine torque. The torque in the fourth engine torque output signal is the preset first torque. During the clutch disengagement phase, the vehicle controller sends the engine fuel supply output signal to the engine controller, which controls engine fuel supply after receiving this engine fuel supply output signal. The torque in the fifth and sixth engine torque output signals is both zero.
[0082] In one possible implementation, the vehicle controller is also used to determine whether the vehicle safety status parameters, power system status parameters, electrical and energy system status parameters, and vehicle external condition parameters all meet the engine shutdown prerequisites.
[0083] Vehicle safety status parameters include the status of the hood, driver's door, and driver's seatbelt. Powertrain status parameters include the engine system operating status, motor system operating status, transmission signal transmission status, and engine coolant temperature. Electrical and energy system status parameters include the battery system operating status, power battery charge, power battery temperature, battery available power, and motor allowable power. Vehicle external condition parameters include the signal transmission status of the air conditioning and heating systems, steering wheel angle, vehicle speed since the last engine shutdown, start / stop inhibit switch status, road grade, and brake vacuum.
[0084] The prerequisites for engine shutdown include the following conditions: the engine hood is closed; the driver's side door is closed; the driver's side seat belt is fastened; the engine system has no faults; the motor system has no faults; the engine system startup prohibition signal sent by the transmission is not obtained; the engine coolant temperature meets the economy requirements for the next engine start; the battery system has no obstacles; the power battery has sufficient power; the power battery temperature meets the power battery power requirements required for engine shutdown; the battery available power meets the power requirements for the next engine start; the motor allowable power meets the power requirements for the next engine start; the engine system shutdown prohibition signal sent by the air conditioning and heating system is not obtained; the steering wheel angle is less than the preset fourteenth value; the vehicle's driving speed after the last engine shutdown is greater than the preset fifteenth value and continues for the preset third time period; the start-stop prohibition switch is in the released state; the road slope meets the safety requirements for parking the vehicle; the brake vacuum is sufficient.
[0085] The present application also provides an engine control method. Figure 3 An engine control method provided by an embodiment of the present application includes the following steps: S11: When the engine is stopped, determine whether the vehicle meets the engine start triggering condition based on the vehicle system status parameters.
[0086] S12: When the vehicle meets the engine start triggering condition, controlling the engine fuel supply and controlling the engine speed to increase from zero to a first speed.
[0087] The first speed is the maximum value among the transmission input shaft speed, the transmission input shaft speed maximum threshold, and the engine idle target speed.
[0088] In a possible implementation, the engine fuel supply and the engine speed may be controlled to increase from zero to a first speed by controlling an engine controller.
[0089] S13: When the engine speed reaches the first speed, the engine speed is controlled to be synchronized with the motor speed according to the vehicle operation mode and the engine control method corresponding to the motor operation mode.
[0090] In one possible implementation, the engine speed may be synchronized with the motor speed by controlling the engine controller.
[0091] In one possible implementation, the engine speed is controlled to be synchronized with the speed of the motor according to the engine control method corresponding to the vehicle's operating mode and the motor's working mode, including: when the vehicle's operating mode is a non-driving mode and the motor's working mode is a non-speed control mode, the engine speed is controlled to be the engine idle target speed so that the engine speed is synchronized with the motor speed; or, when the vehicle's operating mode is a driving mode and / or the motor's working mode is a speed control mode, the engine's output torque is controlled to be a first torque so that the engine speed is synchronized with the motor speed.
[0092] Among them, the first torque is the sum of the second torque and the third torque; the second torque is the adjustment torque obtained according to the difference between the current speed of the motor and the current speed of the engine, and the third torque is the torque compensation value obtained according to the current torque of the motor and the gear position of the gearbox.
[0093] S14: When the engine speed is synchronized with the motor speed and the vehicle meets the preset first condition, the engine speed is controlled to a second speed so that the engine drives the active plate and the driven plate of the clutch to engage, completing the engine starting process.
[0094] The second speed is the maximum value among the current speed of the motor, the maximum threshold value of the transmission input shaft speed, and the target engine idle speed.
[0095] In one possible implementation, the engine controller may be controlled to control the engine speed to a second speed, so that the engine drives the active disc and the driven disc of the clutch to engage, thereby completing the engine starting process.
[0096] In one possible implementation, the engine control method provided in the embodiment of the present application also includes: when the vehicle does not meet the preset first condition, controlling the output torque of the engine to be a fourth torque, so that the engine drives the active plate and the driven plate of the clutch to combine, completing the engine starting process.
[0097] The fourth torque is the minimum value between the engine torque distribution value and the clutch transmittable torque value.
[0098] In one possible implementation, before determining whether the vehicle meets the engine start trigger conditions based on the vehicle system status parameters, the engine control method also includes: determining whether the vehicle power system status and start-stop status, and vehicle safety status parameters all meet the engine start prerequisites.
[0099] In one possible implementation manner, the engine control method provided in the embodiment of the present application also includes: when the engine is started, judging whether the vehicle meets the engine shutdown trigger condition based on the vehicle operating status information; when the vehicle meets the engine shutdown trigger condition, controlling the engine fuel supply and controlling the engine's output torque to drop to a preset first torque according to a preset slope; controlling the engine's output torque to drop from the preset first torque to zero, so that the engine drives the active disc and the driven disc of the clutch to be disconnected; when the active disc and the driven disc of the clutch are disconnected, controlling the engine's output torque to be zero, and sending a stop fuel supply and shutdown signal to the engine to complete the engine shutdown process.
[0100] In one possible implementation, before determining whether the vehicle meets the engine shutdown trigger conditions based on the vehicle operating status information, the engine control method also includes: determining whether the vehicle safety status parameters, power system status parameters, electrical and energy system status parameters, and vehicle external condition parameters all meet the engine shutdown prerequisites.
[0101] The engine control method provided in the embodiment of the present application has the same implementation principle and technical effects as those in the aforementioned vehicle embodiment. For the sake of brief description, for matters not mentioned in the method embodiment, reference may be made to the corresponding content in the aforementioned vehicle embodiment.
[0102] like Figure 4 As shown, Figure 4 The schematic diagram of the principle of an engine control method provided by the embodiment of the present application is shown below. Figure 4 The principle of an engine control method provided in an embodiment of the present application is explained.
[0103] When the engine is stopped, the system determines whether the vehicle's powertrain status, start-stop status, and vehicle safety parameters all meet engine start prerequisites. If the vehicle's powertrain status, start-stop status, and / or vehicle safety parameters do not meet the engine start prerequisites, engine start is prohibited.
[0104] When the vehicle's power system state, start-stop state, and vehicle safety state parameters all meet the engine start prerequisites, a determination is made based on the vehicle system state parameters as to whether the vehicle meets the engine start trigger conditions. If the vehicle does not meet the start trigger conditions, engine start is prohibited. If the vehicle meets the start trigger conditions, the engine fuel supply is controlled and the engine speed is increased from zero to a first speed. When the engine speed reaches the first speed, the engine speed is synchronized with the motor speed based on the vehicle's operating mode and the engine control method corresponding to the motor's operating mode. When the engine speed is synchronized with the motor speed, a determination is made as to whether the vehicle meets the preset first condition. If the vehicle meets the preset first condition, the engine speed is controlled to a second speed, causing the engine to drive the clutch's active and passive plates to engage, completing the engine start process. If the vehicle does not meet the preset first condition, the engine's output torque is controlled to a fourth torque, causing the engine to drive the clutch's active and passive plates to engage, completing the engine start process.
[0105] like Figure 5 As shown, Figure 5 A flow chart of another engine control method provided by an embodiment of the present application is shown. Another engine control method provided by an embodiment of the present application includes the following steps: S21: When the engine is started, determine whether the vehicle meets the engine shutdown triggering condition based on the vehicle running status information.
[0106] S22: When the vehicle meets the engine shutdown triggering condition, the engine fuel supply is controlled and the output torque of the engine is controlled to decrease to a preset first torque according to a preset slope.
[0107] In a possible implementation, the engine controller may be controlled to control the fuel supply to the engine and control the output torque of the engine to decrease to a preset first torque according to a preset slope.
[0108] The first torque is preset to be a negative torque.
[0109] S23: Controlling the output torque of the engine to drop from a preset first torque to zero, so that the engine drives the driving plate and the driven plate of the clutch to be disconnected.
[0110] In one possible implementation, the engine controller may be controlled to reduce the output torque of the engine from a preset first torque to zero, so that the driving plate and the driven plate of the clutch driven by the engine are disconnected.
[0111] S24: When the driving plate and the driven plate of the clutch are disconnected, the output torque of the engine is controlled to be zero, and a fuel supply stop and a shutdown signal are sent to the engine to complete the engine shutdown process.
[0112] In one possible implementation, the engine shutdown process may be completed by controlling the engine controller to set the output torque of the engine to zero and sending a fuel supply stop and shutdown signal to the engine controller.
[0113] In one possible implementation, before determining whether the vehicle meets the engine shutdown trigger conditions based on the vehicle operating status information, the engine control method also includes: determining whether the vehicle safety status parameters, power system status parameters, electrical and energy system status parameters, and vehicle external condition parameters all meet the engine shutdown prerequisites.
[0114] The engine control method provided in the embodiment of the present application has the same implementation principle and technical effects as those in the aforementioned vehicle embodiment. For the sake of brief description, for matters not mentioned in the method embodiment, reference may be made to the corresponding content in the aforementioned vehicle embodiment.
[0115] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.
[0116] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.
Claims
1. An engine control method, characterized in that: A vehicle controller is applied to a vehicle, wherein the vehicle controller is connected to an engine, a motor, and a gearbox in the vehicle, respectively; a clutch in the vehicle is connected to the engine and the motor, respectively; and the gearbox is connected to the motor. The method includes: In the case where the engine is stopped, determining whether the vehicle meets an engine start triggering condition based on vehicle system status parameters; When the vehicle satisfies the engine start trigger condition, controlling the engine fuel supply and controlling the engine speed to increase from zero to a first speed, wherein the first speed is the maximum of a transmission input shaft speed, a transmission input shaft speed maximum threshold, and an engine idle target speed; When the engine speed reaches the first speed, controlling the engine speed to be synchronized with the motor speed according to the vehicle operation mode and the engine control mode corresponding to the motor operation mode; When the speed of the engine is synchronized with the speed of the motor and the vehicle meets a preset first condition, the speed of the engine is controlled to a second speed so that the engine drives the active disc and the driven disc of the clutch to engage, completing the engine starting process, wherein the second speed is the maximum value of the current speed of the motor, the maximum threshold value of the transmission input shaft speed, and the engine idle target speed.
2. The method according to claim 1, characterized in that The controlling the engine speed to be synchronized with the motor speed according to the operating mode of the vehicle and the engine control mode corresponding to the working mode of the motor includes: When the operation mode of the vehicle is a non-driving mode and the operation mode of the motor is a non-speed control mode, controlling the speed of the engine to be the engine idle target speed so that the speed of the engine is synchronized with the speed of the motor; or When the operating mode of the vehicle is the driving mode and / or the working mode of the motor is the speed control mode, the output torque of the engine is controlled to be the first torque so that the speed of the engine is synchronized with the speed of the motor, wherein the first torque is the sum of the second torque and the third torque; the second torque is the adjustment torque obtained according to the difference between the current speed of the motor and the current speed of the engine, and the third torque is the torque compensation value obtained according to the current torque of the motor and the gear position of the transmission.
3. The method according to claim 1, characterized in that The method further comprises: When the vehicle does not meet the preset first condition, the output torque of the engine is controlled to be a fourth torque, so that the engine drives the active plate and the driven plate of the clutch to engage with each other, completing the starting process of the engine, wherein the fourth torque is the minimum value of the engine torque distribution value and the clutch transmittable torque value.
4. The method according to claim 1, wherein The vehicle system status parameters include the start-stop prohibition switch status, the signal transmission status of the air conditioning and heating systems, the brake vacuum, the power battery power, the power battery temperature, the engine coolant temperature, the road slope, the vehicle coasting speed, the battery available power, the motor allowable power, the brake pedal status, the vehicle gear position, and the brake master cylinder pressure; the engine start triggering condition includes at least one of the following conditions: The start-stop prohibition switch is in a pressed state; The engine start prohibition signal sent by the air conditioning and heating system is not obtained; The brake vacuum is insufficient; The power battery is low on power; The power battery temperature meets the power battery power requirement required for starting the engine; The engine coolant temperature meets the economic requirements of engine starting; The road slope is greater than or equal to a preset first value; The vehicle coasting speed is greater than a preset second value; The battery available power meets the battery available power requirement required for starting the engine; The motor allowable power meets the motor allowable power requirement required for starting the engine; The brake pedal state, the vehicle gear position, and the brake master cylinder pressure meet a preset first vehicle operating state condition; The preset first vehicle operating state condition includes any of the following conditions: The vehicle gear is in a non-parking gear and the brake pedal is in a released state; The vehicle gear is in the parking gear and the brake pedal is in a stepped state; The vehicle gear is a reverse gear and the vehicle remains in the reverse gear for a preset first time period; The vehicle gear is a non-parking gear, the brake pedal is in a stepped state, and the brake master cylinder pressure is greater than a preset third value.
5. The method according to claim 1, wherein Before determining whether the vehicle meets the engine start triggering condition based on the vehicle system status parameter, the method further includes: Ensure that the vehicle power system status, start-stop status, and vehicle safety status parameters all meet the engine starting prerequisites.
6. The method according to claim 1, characterized in that The method further comprises: When the engine is started, determining whether the vehicle meets an engine shutdown trigger condition based on vehicle operating state information; When the vehicle satisfies the engine shutdown trigger condition, controlling the engine fuel supply and controlling the engine output torque to decrease to a preset first torque according to a preset slope; wherein the preset first torque is a negative torque; Controlling the output torque of the engine to drop from the preset first torque to zero, so that the engine drives the driving plate and the driven plate of the clutch to be disconnected; When the driving plate and the driven plate of the clutch are disconnected, the output torque of the engine is controlled to be zero, and a fuel supply stop and a shutdown signal are sent to the engine to complete the shutdown process of the engine.
7. The method according to claim 6, characterized in that The vehicle operating status information includes vehicle speed, vehicle gear position, brake pedal status, and brake master cylinder pressure; the engine shutdown triggering condition includes at least one of the following conditions: The vehicle speed satisfies a preset fourth value; The vehicle gear position, the brake pedal state, and the brake master cylinder pressure meet a preset second vehicle operating state condition; The preset second vehicle operating state condition includes any of the following conditions: The vehicle gear is a parking gear; The vehicle gear is a non-parking gear, the brake pedal is in a stepped state, and the brake master cylinder pressure is greater than a preset fifth value; The vehicle gear is the reverse gear and the time the vehicle is in the reverse gear is greater than a preset second time period, and the forward speed of the vehicle after parking is greater than a preset first speed, and whether to trigger the engine shutdown is determined according to the engine shutdown trigger condition.
8. The method according to claim 6, characterized in that Before determining whether the vehicle meets the engine shutdown triggering condition based on the vehicle operating state information, the method further includes: Determine whether the vehicle safety status parameters, power system status parameters, electrical and energy system status parameters, and vehicle external condition parameters all meet the engine shutdown prerequisites.
9. An engine control method, characterized in that: A vehicle controller is applied to a vehicle, the vehicle controller is connected to an engine in the vehicle, and a clutch in the vehicle is connected to the engine. The method includes: When the engine is started, determining whether the vehicle meets an engine shutdown trigger condition based on vehicle operating state information; When the vehicle satisfies the engine shutdown trigger condition, controlling the engine fuel supply and controlling the engine output torque to decrease to a preset first torque according to a preset slope; wherein the preset first torque is a negative torque; Controlling the output torque of the engine to drop from the preset first torque to zero, so that the engine drives the driving plate and the driven plate of the clutch to be disconnected; When the driving plate and the driven plate of the clutch are disconnected, the output torque of the engine is controlled to be zero, and a fuel supply stop and a shutdown signal are sent to the engine to complete the shutdown process of the engine.
10. A vehicle, characterized in that: include: engine; Motor; a gearbox connected to the motor; a clutch, connected to the engine and the motor respectively; A vehicle controller is connected to the engine, the motor, and the gearbox respectively; the vehicle controller is used to execute the method according to any one of claims 1 to 8 or the method according to claim 9.