Engine start-stop control method and device for mild hybrid vehicle and mild hybrid vehicle

Abstract

The present invention discloses a method and device for controlling the engine start-stop of a mild hybrid vehicle and a mild hybrid vehicle. The method comprises: obtaining a multidimensional data set of the mild hybrid vehicle, wherein the multidimensional data set is used to characterize the real-time operating state and fault state of the mild hybrid vehicle; determining a target start-stop mode to be used based on the multidimensional data set; and controlling the engine of the mild hybrid vehicle to start or stop according to the target start-stop mode. The present invention solves the technical problem in the related art that the engine of a mild hybrid vehicle is not stable when starting under different working conditions, and the engine life is reduced due to a long start-up time.

Description

Technical Field

[0001] The present invention relates to the field of automobile engines, and in particular to an engine start-stop control method and device for a mild hybrid vehicle and a mild hybrid vehicle. Background Art

[0002] Traditional vehicles usually use a 12V starter to control the start and stop of the engine. This method has the problem of long start-up time and frequent start and stop, which reduces the life of the engine. Compared with traditional vehicles, hybrid vehicles have added motors and power batteries. During the engine start and stop process, the use of motors and power batteries can achieve better start-stop performance. Hybrid vehicles usually include strong hybrid vehicles (with a hybrid degree of not less than 50%), moderate hybrid vehicles (with a hybrid degree of about 30%), and mild hybrid vehicles (with a hybrid degree of less than 20%). Among them, the mild hybrid system of mild hybrid vehicles can achieve rapid start-up of the entire vehicle and reduce vehicle fuel consumption, which has been valued by domestic and foreign automobile manufacturers.

[0003] However, the engine start-stop control method for a mild hybrid vehicle provided by the related art only uses a small amount of data such as the engine water temperature and the remaining battery capacity as control conditions for the vehicle engine start-stop control, resulting in poor accuracy in the vehicle engine start-stop control process, which in turn results in poor stability and long starting time of the vehicle engine during the start-stop process, thereby reducing the service life of the vehicle engine.

[0004] With regard to the problem in the above-mentioned related technologies that the engine of a mild hybrid vehicle is unstable when starting under different working conditions and the engine life is reduced due to a long starting time, no effective solution has been proposed so far. Summary of the invention

[0005] The embodiments of the present invention provide an engine start-stop control method and device for a mild hybrid vehicle and a mild hybrid vehicle, so as to at least solve the technical problem in the related art that the engine of a mild hybrid vehicle starts unsteadily under different working conditions and the engine life is reduced due to long starting time.

[0006] According to one aspect of an embodiment of the present invention, there is provided an engine start-stop control method for a mild hybrid vehicle, comprising:

[0007] A multidimensional data set of a mild hybrid vehicle is obtained, wherein the multidimensional data set is used to characterize a real-time operating state and a fault state of the mild hybrid vehicle; a target start-stop method to be used is determined based on the multidimensional data set; and an engine of the mild hybrid vehicle is controlled to start or stop according to the target start-stop method.

[0008] Optionally, the multidimensional data set includes: vehicle speed, gear position, motor torque, air conditioning operating parameters, brake vacuum, accelerator pedal opening, brake pedal opening, battery remaining capacity, engine water temperature, key status, start-stop function switch parameters, mild hybrid system fault parameters and motor fault parameters.

[0009] Optionally, determining the target start-stop method to be used based on the multidimensional data set includes: determining whether the mild hybrid vehicle is started for the first time in a current driving task based on a key state and a driving cycle count value of the mild hybrid vehicle; and determining the target start-stop method to be used based on the multidimensional data set in response to the first start of the mild hybrid vehicle.

[0010] Optionally, determining the target start-stop mode to be used based on the multidimensional data set includes: when the multidimensional data set satisfies the following first condition, in response to the real-time collected and updated multidimensional data set satisfying the first shutdown trigger condition, determining that the target start-stop mode is the first parking shutdown mode, wherein the first condition includes: determining that the light hybrid system has no fault according to the light hybrid system fault parameter, determining that the motor has no fault according to the motor fault parameter, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset starting threshold, determining that the air conditioner has no cooling or heating demand according to the air conditioning operation parameter, the brake vacuum is higher than the preset brake threshold, the battery remaining capacity is higher than the first preset power threshold, and the engine water temperature is higher than the preset water temperature threshold; the first shutdown trigger condition includes: the gear is switched to the parking gear or the neutral gear; the first parking shutdown mode includes: controlling the engine to shut down with fuel cut-off, keeping the starter and the motor in the off state, keeping the clutch in the fully open state, and controlling the gear to remain in the parking gear or the neutral gear.

[0011] Optionally, determining the target start-stop mode to be used based on the multidimensional data set also includes: when the multidimensional data set satisfies the following second condition, in response to the real-time collected and updated multidimensional data set satisfying the second shutdown trigger condition, determining that the target start-stop mode is the second parking shutdown mode; the second condition includes: determining that the light hybrid system has no fault according to the light hybrid system fault parameter, determining that the motor has no fault according to the motor fault parameter, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset starting threshold, determining that the air conditioner has no cooling or heating demand according to the air conditioning operation parameter, the brake vacuum is higher than the preset brake threshold, the battery remaining capacity is higher than the first preset power threshold, the engine water temperature is higher than the preset water temperature threshold, and the brake pedal opening is not at the default value; the second shutdown trigger condition includes: the brake pedal opening increases to the brake master cylinder pressure greater than the preset pressure threshold; the second parking shutdown mode includes: controlling the engine to shut down by cutting off fuel, keeping the starter and the motor in a closed state, keeping the clutch in a fully open state, and controlling the gear to remain in the forward gear or the reverse gear.

[0012] Optionally, determining the target start-stop mode to be used based on the multidimensional data set also includes: when the multidimensional data set satisfies the following third condition, in response to the multidimensional data set collected and updated in real time satisfying the first start trigger condition, determining that the target start-stop mode is the first stop-start mode; the third condition includes: determining that the light hybrid system has no fault according to the light hybrid system fault parameter, determining that the motor has no fault according to the motor fault parameter, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the parking gear or neutral gear, and the motor torque is higher than a preset start threshold; the first start trigger condition is to meet at least one of the following: determining that the air conditioner has cooling or heating requirements according to the air conditioning operation parameters, the brake vacuum is lower than the preset braking threshold, the battery remaining capacity is lower than the second preset power threshold, the accelerator pedal opening is greater than the preset acceleration threshold, the gear is switched to the forward gear or the reverse gear, and determining that the start-stop function is turned off according to the start-stop function switch parameter; the first stop-start mode includes: controlling the engine fuel injection ignition, keeping the starter in an off state, controlling the motor to switch to an electric drive state, keeping the clutch in a fully open state, and controlling the gear to remain in the parking gear or neutral gear.

[0013] Optionally, determining the target start-stop mode to be used based on the multidimensional data set also includes: when the multidimensional data set satisfies the following fourth condition, in response to the multidimensional data set collected and updated in real time satisfying the second start trigger condition, determining that the target start-stop mode is the second stop-start mode; the fourth condition includes: determining that the light hybrid system has no fault according to the light hybrid system fault parameter, determining that the motor has no fault according to the motor fault parameter, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset start threshold, and determining that the brake master cylinder pressure is greater than the preset pressure threshold according to the brake pedal opening; the second start trigger condition is to meet at least one of the following: determining that the air conditioner has cooling or heating demand according to the air conditioning operation parameter, the brake vacuum is lower than the preset brake threshold, the battery remaining capacity is lower than the second preset power threshold, and determining that the start-stop function is turned off according to the start-stop function switch parameter; the second stop-start mode includes: controlling the engine fuel injection ignition, keeping the starter in an off state, controlling the motor to switch to the electric drive state, keeping the clutch in a fully open state, and controlling the gear to remain in the forward gear or the reverse gear.

[0014] Optionally, determining the target start-stop mode to be used based on the multidimensional data set also includes: in response to determining that a fault exists in the light hybrid system according to the light hybrid system fault parameters in the multidimensional data set, determining that the target start-stop mode is a first fault shutdown mode, wherein the first fault shutdown mode includes: controlling the light hybrid vehicle to turn on the limp mode and generating a system fault message, the system fault message is used to assist the driver in parking and stopping the light hybrid vehicle; in response to determining that a fault exists in the motor or the motor torque is not higher than a preset starting threshold according to the motor fault parameters in the multidimensional data set, determining that the target start-stop mode is a second fault shutdown mode, wherein the second fault shutdown mode includes: controlling the starter to switch to the on state, receiving a fault level signal corresponding to the motor, and controlling the starter to start the engine according to the fault level signal.

[0015] According to another aspect of an embodiment of the present invention, there is also provided an engine start-stop control device for a mild hybrid vehicle, comprising:

[0016] An acquisition module is used to acquire a multi-dimensional data set of a mild hybrid vehicle, wherein the multi-dimensional data set is used to characterize the real-time operating status and fault status of the mild hybrid vehicle; a determination module is used to determine a target start-stop method to be used based on the multi-dimensional data set; and a control module is used to control the engine of the mild hybrid vehicle to start or stop according to the target start-stop method.

[0017] Optionally, the above-mentioned acquisition module is also used for: the multidimensional data set includes: vehicle speed, gear, motor torque, air conditioning operating parameters, brake vacuum, accelerator pedal opening, brake pedal opening, battery remaining capacity, engine water temperature, key status, start-stop function switch parameters, mild hybrid system fault parameters and motor fault parameters.

[0018] Optionally, the above-mentioned determination module is also used to: determine whether the mild hybrid vehicle is started for the first time in the current driving task according to the key status and the driving cycle count value of the mild hybrid vehicle; in response to the first start of the mild hybrid vehicle, determine the target start-stop method to be used based on the multi-dimensional data set.

[0019] Optionally, the above-mentioned determination module is also used for: in the case where the multidimensional data set satisfies the following first condition, in response to the multidimensional data set collected and updated in real time satisfying the first shutdown trigger condition, determining that the target start-stop mode is the first parking shutdown mode, wherein the first condition includes: determining that the light hybrid system has no fault according to the fault parameters of the light hybrid system, determining that the motor has no fault according to the fault parameters of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameters, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset starting threshold, determining that the air conditioner has no cooling or heating demand according to the air conditioning operation parameters, the brake vacuum is higher than the preset braking threshold, the battery remaining capacity is higher than the first preset power threshold, and the engine water temperature is higher than the preset water temperature threshold; the first shutdown trigger condition includes: the gear is switched to the parking gear or the neutral gear; the first parking shutdown mode includes: controlling the engine to shut down by cutting off the fuel, keeping the starter and the motor in the off state, keeping the clutch in the fully open state, and controlling the gear to remain in the parking gear or the neutral gear.

[0020] Optionally, the above-mentioned determination module is also used for: in the case where the multi-dimensional data set satisfies the following second condition, in response to the multi-dimensional data set collected and updated in real time satisfying the second shutdown trigger condition, determining that the target start-stop mode is the second parking shutdown mode; the second condition includes: determining that the light hybrid system has no fault according to the fault parameters of the light hybrid system, determining that the motor has no fault according to the fault parameters of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameters, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset starting threshold, determining that the air conditioner has no cooling or heating demand according to the air conditioning operation parameters, the brake vacuum is higher than the preset brake threshold, the battery remaining capacity is higher than the first preset power threshold, the engine water temperature is higher than the preset water temperature threshold, and the brake pedal opening is not at the default value; the second shutdown trigger condition includes: the brake pedal opening increases to the brake master cylinder pressure greater than the preset pressure threshold; the second parking shutdown mode includes: controlling the engine to shut down by cutting off the fuel, keeping the starter and the motor in the off state, keeping the clutch in the fully open state, and controlling the gear to remain in the forward gear or the reverse gear.

[0021] Optionally, the determination module is further used to: determine the target start-stop mode as the first stop-start mode in response to the multidimensional data set collected and updated in real time satisfying the first start trigger condition when the multidimensional data set satisfies the following third condition; the third condition includes: determining that the light hybrid system has no fault according to the fault parameter of the light hybrid system, determining that the motor has no fault according to the fault parameter of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the parking gear or neutral gear, and the motor torque is higher than a preset start threshold; the first start trigger condition is to meet at least one of the following: determining that the air conditioner has cooling or heating requirements according to the air conditioning operation parameter, the brake vacuum is lower than the preset braking threshold, the remaining battery capacity is lower than the second preset power threshold, the accelerator pedal opening is greater than the preset acceleration threshold, the gear is switched to the forward gear or the reverse gear, and determining that the start-stop function is turned off according to the start-stop function switch parameter; the first stop-start mode includes: controlling the engine fuel injection ignition, keeping the starter in the off state, controlling the motor to switch to the electric drive state, keeping the clutch in the fully open state, and controlling the gear to remain in the parking gear or the neutral gear.

[0022] Optionally, the above-mentioned determination module is also used for: in the case where the multi-dimensional data set satisfies the following fourth condition, in response to the multi-dimensional data set collected and updated in real time satisfying the second start trigger condition, determining that the target start-stop mode is the second stop-start mode; the fourth condition includes: determining that the light hybrid system has no fault according to the fault parameters of the light hybrid system, determining that the motor has no fault according to the fault parameters of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameters, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset start threshold, and determining that the brake master cylinder pressure is greater than the preset pressure threshold according to the brake pedal opening; the second start trigger condition is to meet at least one of the following: determining that the air conditioner has cooling or heating requirements according to the air conditioning operation parameters, the brake vacuum is lower than the preset brake threshold, the remaining battery capacity is lower than the second preset power threshold, and determining that the start-stop function is turned off according to the start-stop function switch parameters; the second stop-start mode includes: controlling the engine fuel injection ignition, keeping the starter in the off state, controlling the motor to switch to the electric drive state, keeping the clutch in the fully open state, and controlling the gear to remain in the forward gear or the reverse gear.

[0023] Optionally, the above-mentioned determination module is also used for: in response to determining that a fault exists in the mild hybrid system according to the mild hybrid system fault parameters in the multidimensional data set, determining that the target start-stop mode is a first fault shutdown mode, wherein the first fault shutdown mode includes: controlling the mild hybrid vehicle to turn on the limp mode and generating a system fault message, the system fault message is used to assist the driver in parking and stopping the mild hybrid vehicle; in response to determining that a fault exists in the motor or the motor torque is not higher than a preset starting threshold according to the motor fault parameters in the multidimensional data set, determining that the target start-stop mode is a second fault shutdown mode, wherein the second fault shutdown mode includes: controlling the starter to switch to the on state, receiving a fault level signal corresponding to the motor, and controlling the starter to start the engine according to the fault level signal.

[0024] According to another aspect of an embodiment of the present invention, a mild hybrid vehicle is provided, comprising an on-board memory and an on-board processor, wherein a computer program is stored in the on-board memory, and the on-board processor is configured to run the computer program to execute any one of the aforementioned engine start-stop control methods for a mild hybrid vehicle.

[0025] In an embodiment of the present invention, a multidimensional data set of a mild hybrid vehicle is first obtained, wherein the multidimensional data set is used to characterize the real-time operating status and fault status of the mild hybrid vehicle, and then a target start-stop mode to be used is determined based on the multidimensional data set. Finally, the engine of the mild hybrid vehicle is controlled to start or stop according to the target start-stop mode. By determining the target start-stop mode of the engine based on the multidimensional data set of the mild hybrid vehicle, and then controlling the engine start-stop according to the target start-stop mode, the purpose of accurately starting and stopping the engine of the mild hybrid vehicle using the multidimensional data set is achieved, thereby achieving the technical effect of improving the accuracy of the engine start-stop control process of the mild hybrid vehicle, improving user experience, and reducing fuel consumption, thereby solving the technical problem in the related art that the engine of the mild hybrid vehicle is unstable under different working conditions and the long starting time leads to reduced engine life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 is a hardware structure block diagram of a vehicle terminal for an optional engine start-stop control method for a mild hybrid vehicle according to an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of a mild hybrid system of a mild hybrid vehicle according to an embodiment of the present invention;

[0029] Figure 3is a flow chart of an engine start-stop control method for a mild hybrid vehicle according to an embodiment of the present invention;

[0030] Figure 4 is a flow chart of a first start process of an engine of a mild hybrid vehicle according to an embodiment of the present invention;

[0031] Figure 5 4 is a structural block diagram of an engine start-stop control device for a mild hybrid vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] According to an embodiment of the present invention, a method embodiment of an engine start-stop control method for a mild hybrid vehicle is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0035] Figure 1 is a hardware structure block diagram of a vehicle terminal of an optional engine start-stop control method for a mild hybrid vehicle according to an embodiment of the present invention, such as Figure 1As shown, the vehicle terminal 10 (or a mobile device 10 that is communicatively associated with the vehicle) may include one or more processors 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor (Microcontroller Unit, MCU) or a programmable logic device (Field Programmable Gate Array, FPGA)), a memory 104 for storing data, and a transmission device 106 for communication functions. In addition, it may also include: a display device 110, an input / output device 108 (i.e., an I / O device), a Universal Serial Bus (USB) port (which may be included as one of the ports of a computer bus, not shown in the figure), a network interface (not shown in the figure), a power supply (not shown in the figure) and / or a camera (not shown in the figure). It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the vehicle terminal 1. For example, the vehicle terminal 10 may also include Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0036] It should be noted that the one or more processors 102 and / or other data processing circuits may be embodied in whole or in part as software, hardware, firmware or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the vehicle terminal 10 (or mobile device).

[0037] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the engine start-stop control method of the light hybrid vehicle in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, the engine start-stop control method of the light hybrid vehicle described above is realized. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the vehicle terminal 10 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0038] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the vehicle terminal 10. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0039] Figure 2 is a schematic diagram of a mild hybrid system for a mild hybrid vehicle according to an embodiment of the present invention. Figure 2 As shown, the mild hybrid system of the mild hybrid vehicle at least includes: an accelerator pedal 201, which is used to control the opening and closing degree of the throttle of the engine 217, thereby controlling the power output of the engine 217; a brake pedal 202, which is used to limit the power output of the engine 217 to control the mild hybrid vehicle to slow down or stop; a vehicle control unit (VCU) 203 is a core control component of the mild hybrid vehicle, which is used to send control instructions to one or more other components of the mild hybrid vehicle (such as a battery management system 205, a motor controller 206, and an engine control system 207) to control their operation; a DC conversion controller 204 and a DC converter (Direct Current-Direct Current Converter) 213, both of which are used to convert a DC power supply into a DC power supply of different voltages; a battery management system (Battery Management System, BMS) 205, which is used to monitor the status of the battery to avoid abnormal conditions such as overcharging, overdischarging, and overtemperature of the battery; and a motor control unit (MCU) 206, which is used to control the motor to work according to the set direction, speed, angle, and response time.

[0040] Still Figure 2As shown, the mild hybrid system of the mild hybrid vehicle at least includes: a transmission control unit (TCU) 208, which is used to control and manage the transmission 219; an anti-lock brake system (ABS) 209, which is used to automatically control the braking force of the vehicle when the mild hybrid vehicle brakes, thereby preventing the front wheels 220 and the rear wheels 221 from being locked, so as to improve the safety of the mild hybrid vehicle; an electronic stability program (ESP) 210, which is used to analyze the vehicle driving information transmitted by various vehicle sensors (such as position sensors, speed sensors, temperature sensors, and pressure sensors), and send correction instructions to related components to enable the mild hybrid vehicle to maintain dynamic balance.

[0041] Still Figure 2 As shown, the mild hybrid system of the mild hybrid vehicle at least includes: a 48V battery 211, which is used to increase the voltage of each component of the mild hybrid vehicle, and can provide a greater driving power for the motor 215 to achieve rapid start and stop of the engine 217; an inverter 212, which is used to adjust the frequency and amplitude of the output voltage to control the speed and power of the vehicle; a 12V battery 214, which is used to provide power for the components of the mild hybrid vehicle; a BSG (Belt-Driven Starter Generator) motor 215 is used to adjust the speed of engine 217; starter 216 is used to convert the electrical energy of power source (such as 48V battery 211, 12V battery 214) into mechanical energy, driving the flywheel of engine 217 to rotate so as to start engine 217; engine 217 is used to drive the mild hybrid vehicle to travel; clutch 218 is used to cut off or transmit the power output by engine 217; gearbox 219 is used to transmit the speed and torque from engine 217; front wheel 220 and rear wheel 221 are used to bear the whole vehicle weight of mild hybrid vehicle, transmit braking force, traction force, braking torque, driving torque, and can also be used to alleviate and absorb the impact and vibration caused by uneven ground to mild hybrid vehicle.

[0042] Under the above operating environment, the embodiment of the present invention provides the following Figure 3 The engine start-stop control method of the mild hybrid vehicle shown in FIG. Figure 3 is a flow chart of an engine start-stop control method for a mild hybrid vehicle according to an embodiment of the present invention. Figure 3 As shown above Figure 3 The illustrated embodiment may include at least the following implementation steps, which may be the technical solution implemented by steps S31 to S33.

[0043] Step S31, obtaining a multi-dimensional data set of the mild hybrid vehicle, wherein the multi-dimensional data set is used to characterize the real-time operating state and fault state of the mild hybrid vehicle;

[0044] In an optional solution provided in the above step S31, the above-mentioned mild hybrid vehicle (MHEV) is an original 12V battery ( Figure 2 A 48V battery ( Figure 2 The 48V battery 211 shown in the figure can be used to improve the start-stop efficiency of the engine, thereby reducing the vehicle's sense of frustration when decelerating or braking, and the 48V battery can also be used to power other devices (such as air-conditioning compressors).

[0045] In an optional solution provided in the above step S31, the above multi-dimensional data may be various types of vehicle data related to the start-stop control process of the engine of the mild hybrid vehicle, and the multi-dimensional data may include but are not limited to: gear information, air conditioner status, battery status, motor status. The above real-time operating status may be the real-time operating status of each component of the mild hybrid vehicle. Specifically, for example, at a certain moment, the real-time operating status of the mild hybrid vehicle is: the vehicle speed is 0, the gear is in the forward gear, the air conditioner has a start request, the remaining capacity of the battery (State Of Charge, SOC) is higher than 40%, and the water temperature of the engine is higher than 60°C; the above fault status may be whether there is a fault in the mild hybrid system of the mild hybrid vehicle. It should also be noted here that the fault type of the mild hybrid system may include but is not limited to: protection system fault (such as airbag damage, seat belt sensor damage), circuit fault (such as fuse melting, high-voltage coil disconnection), oil circuit fault (such as oil circuit blockage, nozzle damage).

[0046] In the optional solution provided by the present invention, a multi-dimensional data set of a mild hybrid vehicle is obtained. The specific method may be: directly reading part of the data set (such as vehicle speed, remaining battery capacity) through the dashboard; using vehicle sensors to obtain corresponding data sets, for example: using a temperature sensor to collect the water temperature of the engine.

[0047] Step S32, determining a target start-stop mode to be used based on the multi-dimensional data set;

[0048] In an optional solution provided in the above step S32, the above target start-stop mode may be one of multiple start-stop modes of the engine of the mild hybrid vehicle, and the multiple start-stop modes may include but are not limited to: starting the engine after stopping in a specific gear, and stopping the engine after stopping in a specific gear. It should also be noted that the above specific gear may include but are not limited to: parking gear (Parking, P gear), neutral gear (Neutral, N gear), forward gear (Drive, D gear, also known as drive gear), and reverse gear (Reverse, R gear).

[0049] In the optional solution provided by the present invention, the target start-stop mode to be used is determined based on the multi-dimensional data set. The specific method may be: pre-storing one or more engine start-stop conditions in the storage device of the light hybrid vehicle, the one or more engine start-stop conditions may be constraints formed when one or more vehicle parameters obtain specific parameter values, comparing the acquired multi-dimensional data set with the one or more engine start-stop conditions, and determining the target start-stop mode under the target engine start-stop conditions. Specifically, for example, the vehicle parameters are vehicle speed, remaining battery capacity, and engine water temperature, and the start-stop conditions corresponding to the engine oil cut-off shutdown are: vehicle speed is 0, remaining battery capacity is higher than 35%, and engine water temperature is higher than 65°C. When the collected multi-dimensional data set includes: vehicle speed is 0, remaining battery capacity is 40%, and engine water temperature is 68°C, it can be determined that the target start-stop mode of the engine is engine oil cut-off shutdown.

[0050] Step S33: Controlling the engine of the mild hybrid vehicle to start or stop according to the target start-stop mode.

[0051] In the optional solution provided by the present invention, the engine of the mild hybrid vehicle is controlled to start or stop according to the target start-stop mode. The specific method may be: assuming that the target start-stop mode of the mild hybrid vehicle is the engine fuel cut-off shutdown, using Figure 2 The vehicle controller 203 shown sends a control command to the engine control system 207 to control the engine 217 to reduce torque and disengage the clutch 218, and uses the oil cut-off cylinder to drive the oil cut-off handle to control the oil pump of the engine 217 to stop supplying oil.

[0052] In an embodiment of the present invention, a multidimensional data set of a mild hybrid vehicle is first obtained, wherein the multidimensional data set is used to characterize the real-time operating status and fault status of the mild hybrid vehicle, and then a target start-stop mode to be used is determined based on the multidimensional data set. Finally, the engine of the mild hybrid vehicle is controlled to start or stop according to the target start-stop mode. By determining the target start-stop mode of the engine based on the multidimensional data set of the mild hybrid vehicle, and then controlling the engine start-stop according to the target start-stop mode, the purpose of accurately starting and stopping the engine of the mild hybrid vehicle using the multidimensional data set is achieved, thereby achieving the technical effect of improving the accuracy of the engine start-stop control process of the mild hybrid vehicle, improving user experience, and reducing fuel consumption, thereby solving the technical problem in the related art that the engine of the mild hybrid vehicle is unstable under different working conditions and the long starting time leads to reduced engine life.

[0053] The above method of the embodiment of the present invention is further introduced below.

[0054] In an optional embodiment, in step S31, the multidimensional data set includes: vehicle speed, gear, motor torque, air conditioning operating parameters, brake vacuum, accelerator pedal opening, brake pedal opening, battery remaining capacity, engine water temperature, key status, start-stop function switch parameters, mild hybrid system fault parameters and motor fault parameters.

[0055] In the optional scheme provided by the present invention, the above-mentioned air-conditioning operating parameters may include but are not limited to: air volume, compressor speed, water flow, operating temperature, which can be used to determine the usage requirements of the vehicle air-conditioning (such as cooling requirements, heating requirements); the above-mentioned brake vacuum degree may be the vacuum degree provided by the vacuum processor of the mild hybrid vehicle when the vehicle brakes; the above-mentioned start-stop function switch parameters can be used to characterize the state of the engine start-stop function of the mild hybrid vehicle (such as: triggered, closed); the above-mentioned mild hybrid system fault parameters may include but are not limited to: protection system fault parameters (such as the state of the airbag, the state of the seat belt sensor), circuit fault parameters (such as the state of the fuse, the operating state of the high-voltage coil); the above-mentioned motor fault parameters may include but are not limited to: the state of the injector, the operating state of the ignition coil, and the temperature of the motor.

[0056] In an optional embodiment, in step S32, determining the target start-stop mode to be used based on the multi-dimensional data set includes:

[0057] Step S3211, determining whether the mild hybrid vehicle is started for the first time in the current driving task according to the key state and the driving cycle count value of the mild hybrid vehicle;

[0058] Step S3212, in response to the mild hybrid vehicle being started for the first time, determining a target start-stop mode to be used based on the multi-dimensional data set.

[0059] In an optional solution provided by the above steps S3211 to S3212, the above key status may include but is not limited to: ignition start, vehicle power on, locking, and accessory power on. The above driving cycle count value may be a value collected by an internal counter pre-set by a technician in the vehicle controller, and the driving cycle count value may be used to characterize the number of times the engine of a light hybrid vehicle is started during a driving process. It should also be noted here that during a driving process, when the key is used for ignition and the driving cycle count value collected in real time by the internal counter is 1, it can be determined that this ignition start process is the first engine start process. When the light hybrid vehicle completes all driving tasks during this driving process and the engine downtime exceeds the preset time threshold, the driving cycle count value can be reset to zero.

[0060] The following combination Figure 4 The above method is further explained.

[0061] Figure 4: is a flow chart of a process of starting the engine of a mild hybrid vehicle for the first time according to an embodiment of the present invention. Figure 4 As shown, the light hybrid vehicle is ignited and started using a key, and based on the real-time acquired driving cycle count value, it is determined whether the vehicle is started for the first time (that is, it is determined whether the real-time acquired driving cycle count value is 1). Further, when the real-time acquired driving cycle count value is not 1, other starting controls are performed on the vehicle; when the real-time acquired driving cycle count value is 1, it is determined that the vehicle is in the first starting condition. At this time, the starting module of the starter is used to determine whether the acquired multi-dimensional data (multi-dimensional factors) meet the first starting conditions. Specifically, for example, the first starting conditions include: the vehicle speed is 0, the vehicle gear is in the P gear or the N gear, the vehicle's start-stop function switch parameter indicates that the vehicle is in the start-stop function trigger state, and the light hybrid system has a fault (or the torque capacity of the motor does not meet the starting requirements).

[0062] Still Figure 2 , 4 As shown, further, when the acquired multi-dimensionality does not meet the first starting condition, the vehicle is prohibited from starting; when the acquired multi-dimensionality meets the first starting condition, the vehicle controller 203 is used to control the engine control system 207, and the engine 217 is started by the starter 216, and then, it is determined whether the starter 216 fails during the starting process of the engine 217. When one or more components of the mild hybrid system (such as the starter 216) fail during the starting process, the BSG motor 215 module is called to realize the starting; when all components of the mild hybrid system are not faulty, and the obtained multi-dimensional data set meets: the vehicle speed is 0, the gear is P gear or N gear, the vehicle's start-stop function is turned on based on the vehicle's start-stop function switch parameters, one or more components of the mild hybrid system are faulty, or the torque capacity of the motor does not meet the starting requirement, under this working condition, when the key is detected for the first time to control the vehicle to ignite and start, the starter 216 is controlled to drive the engine 217 to reach a preset speed value (such as 1200 rpm), and then the engine 217 is ignited by fuel injection to complete the starting, and the states of the various assemblies of the mild hybrid vehicle are controlled to: keep the starter 216 and the engine 217 in the starting state, keep the BSG motor 215 in the starting state, keep the gear in the P gear or the N gear, and keep the clutch 218 in the fully open state, so as to realize the first start of the engine 217.

[0063] In the above optional embodiments, the technical effect that can be achieved is: a counter is set inside the vehicle to count the vehicle's driving cycle count value, so as to facilitate accurate judgment of the vehicle's first start process; using the acquired multi-dimensional data (including: vehicle speed, gear status, start-stop function switch parameters, mild hybrid system fault parameters, motor fault parameters), comprehensively judge whether the target start-stop mode of the mild hybrid vehicle is the first start, thereby improving the accuracy of the determined target start-stop mode based on the multi-dimensional data, and then improving the accuracy of the first start control of the mild hybrid vehicle's engine using the target start-stop mode, thereby improving the stability of the engine at the first start, reducing the response time of the engine for the first start, and extending the service life of the engine.

[0064] In an optional embodiment, in step S32, determining the target start-stop mode to be used based on the multi-dimensional data set includes:

[0065] Step S3221, in the case where the multidimensional data set satisfies the following first condition, in response to the multidimensional data set collected and updated in real time satisfying the first shutdown trigger condition, the target start-stop mode is determined to be the first parking shutdown mode, wherein the first condition includes: determining that the light hybrid system has no fault according to the fault parameters of the light hybrid system, determining that the motor has no fault according to the fault parameters of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameters, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset starting threshold, determining that the air conditioner has no cooling or heating demand according to the air conditioning operation parameters, the brake vacuum is higher than the preset brake threshold, the battery remaining capacity is higher than the first preset power threshold, and the engine water temperature is higher than the preset water temperature threshold; the first shutdown trigger condition includes: the gear is switched to the parking gear or the neutral gear; the first parking shutdown mode includes: controlling the engine to shut down with fuel cut-off, keeping the starter and the motor in the off state, keeping the clutch in the fully open state, and controlling the gear to remain in the parking gear or the neutral gear.

[0066] In an optional scheme provided by the above step S3221, the above preset starting threshold, the above preset braking threshold, the above first preset power threshold, and the above preset water temperature threshold can be standard parameter values ​​corresponding to the above motor torque, braking vacuum, battery remaining capacity, and engine water temperature when the mild hybrid vehicle is in normal operating state, specifically, for example: the preset starting threshold is 50N·m, the preset braking threshold is 0.07MPA, the first preset power threshold is 36%, and the preset water temperature threshold is 65°C; it should also be noted here that the above preset starting threshold, the above preset braking threshold, the above first preset power threshold, and the above preset water temperature threshold can also be parameter values ​​of corresponding parameters determined by technical personnel based on different operating conditions of the mild hybrid vehicle.

[0067] In the optional scheme provided by the present invention, it should also be noted that when the target start-stop mode of the engine is the first stop mode, the air-conditioning operating parameters in the multi-dimensional data can also meet the following requirements: it is determined according to the air-conditioning operating parameters that the air-conditioning has a start-up demand, but the response time of the start-up demand is less than the start-up time threshold (such as 2s).

[0068] As an optional implementation, determining that the target start-stop mode to be used is the first parking mode based on the multi-dimensional data set may be as shown in the following Table 1:

[0069] Table 1

[0070]

[0071]

[0072] In the above optional embodiments, the technical effect that can be achieved is: using the acquired multi-dimensional data (including: vehicle speed, current gear status, start-stop function switch parameters, mild hybrid system fault parameters, motor fault parameters, motor torque, air conditioning operation parameters, brake vacuum, battery remaining capacity, engine water temperature, target gear status), comprehensively judge whether the target start-stop mode of the mild hybrid vehicle is the first stop and shutdown mode, thereby improving the accuracy of the determined target start-stop mode based on the multi-dimensional data, and then improving the accuracy of the first stop and shutdown control of the engine of the mild hybrid vehicle using the target start-stop mode, thereby improving the stability of the engine during the first stop and shutdown, reducing the response time of the engine during the first stop and shutdown, and extending the service life of the engine.

[0073] In an optional embodiment, in step S32, determining the target start-stop mode to be used based on the multi-dimensional data set further includes:

[0074] Step S3231, when the multi-dimensional data set satisfies the following second condition, in response to the multi-dimensional data set collected and updated in real time satisfying the second shutdown trigger condition, the target start-stop mode is determined to be the second parking shutdown mode; the second condition includes: determining that the light hybrid system has no fault according to the fault parameters of the light hybrid system, determining that the motor has no fault according to the fault parameters of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameters, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset start threshold, determining that the air conditioner has no cooling or heating demand according to the air conditioning operation parameters, the brake vacuum is higher than the preset brake threshold, the battery remaining capacity is higher than the first preset power threshold, the engine water temperature is higher than the preset water temperature threshold, and the brake pedal opening is not at the default value; the second shutdown trigger condition includes: the brake pedal opening increases to the brake master cylinder pressure greater than the preset pressure threshold; the second parking shutdown mode includes: controlling the engine to shut down with fuel cut-off, keeping the starter and the motor in the off state, keeping the clutch in the fully open state, and controlling the gear to remain in the forward gear or the reverse gear.

[0075] In an optional solution provided in step S3231, the brake pedal opening can be used to control the driving speed of the mild hybrid vehicle, and the brake pedal opening can include: the pedal is fully depressed, the pedal is fully released, and the pedal is partially depressed. The default value can be that the brake pedal opening is partially (or fully) depressed. The preset pressure threshold can be the lowest value of the brake master cylinder under normal engine operation (e.g., 1200 kPa).

[0076] As an optional implementation, determining that the target start-stop mode to be used is the second parking mode based on the multi-dimensional data set may be as shown in the following Table 2:

[0077] Table 2

[0078]

[0079] In the above optional embodiments, the technical effect that can be achieved is: using the acquired multi-dimensional data (including: vehicle speed, current gear status, start-stop function switch parameters, mild hybrid system fault parameters, motor fault parameters, motor torque, air conditioning operation parameters, brake vacuum, battery remaining capacity, engine water temperature, target gear status), comprehensively judge whether the target start-stop mode of the mild hybrid vehicle is the second stop and shutdown mode, thereby improving the accuracy of the determined target start-stop mode based on the multi-dimensional data, and then improving the accuracy of the second stop and shutdown control of the engine of the mild hybrid vehicle using the target start-stop mode, thereby improving the stability of the engine during the second stop and shutdown, reducing the response time of the engine during the second stop and shutdown, and extending the service life of the engine.

[0080] In an optional embodiment, in step S32, determining the target start-stop mode to be used based on the multi-dimensional data set further includes:

[0081] Step S3241, in the case where the multi-dimensional data set satisfies the following third condition, in response to the multi-dimensional data set collected and updated in real time satisfying the first start trigger condition, the target start-stop mode is determined to be the first stop-start mode; the third condition includes: determining that the light hybrid system has no fault according to the fault parameters of the light hybrid system, determining that the motor has no fault according to the fault parameters of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameters, the vehicle speed is zero, the gear is in the parking gear or neutral gear, and the motor torque is higher than the preset start threshold; the first start trigger condition is to meet at least one of the following: determining that the air conditioner has cooling or heating requirements according to the air conditioning operation parameters, the brake vacuum is lower than the preset braking threshold, the remaining battery capacity is lower than the second preset power threshold, the accelerator pedal opening is greater than the preset acceleration threshold, the gear is switched to the forward gear or the reverse gear, and determining that the start-stop function is turned off according to the start-stop function switch parameters; the first stop-start mode includes: controlling the engine fuel injection ignition, keeping the starter in an off state, controlling the motor to switch to the electric drive state, keeping the clutch in a fully open state, and controlling the gear to remain in the parking gear or neutral gear.

[0082] In an optional solution provided by the above step S3241, the above preset acceleration threshold may be a minimum value of the accelerator pedal opening corresponding to the first stop and start of the engine preset by a technician, and the preset braking threshold may be presented in percentage form (such as 2%).

[0083] As an optional implementation, the target start-stop mode to be used is determined to be the first stop-start mode based on the multi-dimensional data set, which may be as shown in the following Table 3:

[0084] Table 3

[0085]

[0086]

[0087] In the above optional embodiments, the technical effect that can be achieved is: using the acquired multi-dimensional data (including: vehicle speed, current gear status, start-stop function switch parameters, mild hybrid system fault parameters, motor fault parameters, motor torque, air conditioning operation parameters, brake vacuum, battery remaining capacity, engine water temperature, target gear status), comprehensively judge whether the target start-stop mode of the mild hybrid vehicle is the first stop-start mode, thereby improving the accuracy of the determined target start-stop mode based on the multi-dimensional data, and then improving the accuracy of the first stop-start control of the engine of the mild hybrid vehicle using the target start-stop mode, thereby improving the stability of the engine during the first stop-start, reducing the response time of the engine during the first stop-start, and extending the service life of the engine.

[0088] In an optional embodiment, in step S32, determining the target start-stop mode to be used based on the multi-dimensional data set further includes:

[0089] Step S3251, when the multi-dimensional data set satisfies the following fourth condition, in response to the multi-dimensional data set collected and updated in real time satisfying the second start trigger condition, the target start-stop mode is determined to be the second stop-start mode; the fourth condition includes: determining that the light hybrid system has no fault according to the fault parameters of the light hybrid system, determining that the motor has no fault according to the fault parameters of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameters, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset start threshold, and determining that the brake master cylinder pressure is greater than the preset pressure threshold according to the brake pedal opening; the second start trigger condition is to meet at least one of the following: determining that the air conditioner has cooling or heating requirements according to the air conditioning operation parameters, the brake vacuum is lower than the preset brake threshold, the remaining battery capacity is lower than the second preset power threshold, and determining that the start-stop function is turned off according to the start-stop function switch parameters; the second stop-start mode includes: controlling the engine fuel injection ignition, keeping the starter in an off state, controlling the motor to switch to the electric drive state, keeping the clutch in a fully open state, and controlling the gear to remain in the forward gear or the reverse gear.

[0090] As an optional implementation, the target start-stop mode to be used is determined to be the second stop-start mode based on the multi-dimensional data set, which may be shown in the following Table 4:

[0091] Table 4

[0092]

[0093]

[0094] In the above optional embodiments, the technical effect that can be achieved is: using the acquired multi-dimensional data (including: vehicle speed, current gear status, start-stop function switch parameters, mild hybrid system fault parameters, motor fault parameters, motor torque, air conditioning operation parameters, brake vacuum, battery remaining capacity, engine water temperature, target gear status), comprehensively judge whether the target start-stop mode of the mild hybrid vehicle is the second stop-start mode, thereby improving the accuracy of the determined target start-stop mode based on the multi-dimensional data, and then improving the accuracy of the second stop-start control of the engine of the mild hybrid vehicle using the target start-stop mode, thereby improving the stability of the engine during the second stop-start, reducing the response time of the engine during the second stop-start, and extending the service life of the engine.

[0095] In an optional embodiment, in step S32, determining the target start-stop mode to be used based on the multi-dimensional data set further includes:

[0096] Step S3261, in response to determining that a mild hybrid system has a fault according to the mild hybrid system fault parameter in the multi-dimensional data set, determining that the target start-stop mode is a first fault stop mode, wherein the first fault stop mode includes: controlling the mild hybrid vehicle to start a limp home mode and generating a system fault message, the system fault message is used to assist the driver in performing parking control on the mild hybrid vehicle;

[0097] Step S3262, in response to determining that the motor is faulty or the motor torque is not higher than the preset starting threshold according to the motor fault parameters in the multidimensional data set, determines that the target start-stop mode is the second fault stop mode, wherein the second fault stop mode includes: controlling the starter to switch to the on state, receiving the fault level signal corresponding to the motor, and controlling the starter to start the engine according to the fault level signal.

[0098] In an optional solution provided by the above steps S3261 to S3262, the above limp mode can be that when an electronic control unit (ECU) in the light hybrid vehicle fails, the ECU automatically activates a backup control circuit to perform simple control on the engine, so that the vehicle drives to a target location (such as a vehicle repair shop) for fault repair. The above system fault message can be presented to the user in text form through the vehicle display screen, can be played to the user in voice form using a vehicle voice device, or can be presented to the user using a fault warning light.

[0099] In an optional solution provided by the above steps S3261 to S3262, the above fault level signal can be used to characterize the severity of different types of motor faults. Specifically, for example, the fault level signals are ranked from high to low in severity: level 1, level 2, level 3, and level 4, wherein the fault type corresponding to the level 1 fault level signal can be Figure 2 The DC bus of the motor controller 206 shown in the figure has an overcurrent fault, and the fault type corresponding to the secondary fault level signal can be Figure 2 The phase current of the motor controller 206 is overcurrent (or the node of the BSG motor 215 is lost), and the fault type corresponding to the three-level fault level signal can be Figure 2 The motor controller 206 shown in the figure has overspeed protection, and the fault type corresponding to the four-level fault level signal can be Figure 2 Motor controller 206 is shown experiencing a DC undervoltage fault.

[0100] In the above optional embodiments, the technical effects that can be achieved are as follows: by accurately determining the target fault shutdown mode (first fault shutdown mode, second fault shutdown mode) based on different fault parameters (mild hybrid system fault parameters, motor fault parameters), the accuracy of judging the target fault shutdown mode is improved; not only the start and stop mode of the engine when the mild hybrid system of the mild hybrid vehicle is in a normal state is taken into account, but also the fault shutdown mode of the engine when a fault occurs in the mild hybrid system is taken into account, thereby improving the integrity of the start and stop control of the engine of the mild hybrid vehicle, reducing the response time of the engine during a fault shutdown, and extending the service life of the engine.

[0101] Figure 5 is a structural block diagram of an engine start-stop control device for a mild hybrid vehicle according to an embodiment of the present invention. Figure 5 As shown, the device comprises:

[0102] An acquisition module 501 is used to acquire a multi-dimensional data set of a mild hybrid vehicle, wherein the multi-dimensional data set is used to characterize a real-time operating state and a fault state of the mild hybrid vehicle;

[0103] A determination module 502, configured to determine a target start-stop mode to be used based on the multi-dimensional data set;

[0104] The control module 503 is used to control the engine of the mild hybrid vehicle to start or stop according to the target start-stop mode.

[0105] Optionally, the acquisition module 501 is also used for: the multidimensional data set includes: vehicle speed, gear, motor torque, air conditioning operating parameters, brake vacuum, accelerator pedal opening, brake pedal opening, battery remaining capacity, engine water temperature, key status, start-stop function switch parameters, mild hybrid system fault parameters and motor fault parameters.

[0106] Optionally, the determination module 502 is further used to: determine whether the mild hybrid vehicle is started for the first time in a current driving task according to a key state and a driving cycle count value of the mild hybrid vehicle; and determine a target start-stop method to be used based on a multi-dimensional data set in response to the first start of the mild hybrid vehicle.

[0107] Optionally, the determination module 502 is further used to: determine the target start-stop mode as the first parking mode in response to the real-time collected and updated multidimensional data set satisfying the first shutdown trigger condition when the multidimensional data set satisfies the following first condition, wherein the first condition includes: determining that the light hybrid system has no fault according to the fault parameters of the light hybrid system, determining that the motor has no fault according to the fault parameters of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameters, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset starting threshold, determining that the air conditioner has no cooling or heating demand according to the air conditioning operation parameters, the brake vacuum is higher than the preset brake threshold, the battery remaining capacity is higher than the first preset power threshold, and the engine water temperature is higher than the preset water temperature threshold; the first shutdown trigger condition includes: the gear is switched to the parking gear or the neutral gear; the first parking mode includes: controlling the engine to shut down by cutting off the fuel, keeping the starter and the motor in the off state, keeping the clutch in the fully open state, and controlling the gear to remain in the parking gear or the neutral gear.

[0108] Optionally, the determination module 502 is further used to: determine that the target start-stop mode is the second parking mode in response to the real-time acquisition and update of the multidimensional data set satisfying the second shutdown trigger condition when the multidimensional data set satisfies the following second condition; the second condition includes: determining that the light hybrid system has no fault according to the fault parameter of the light hybrid system, determining that the motor has no fault according to the fault parameter of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset start threshold, determining that the air conditioner has no cooling or heating demand according to the air conditioning operation parameter, the brake vacuum is higher than the preset brake threshold, the battery remaining capacity is higher than the first preset power threshold, the engine water temperature is higher than the preset water temperature threshold, and the brake pedal opening is not at the default value; the second shutdown trigger condition includes: the brake pedal opening increases to the brake master cylinder pressure greater than the preset pressure threshold; the second parking mode includes: controlling the engine to shut down by cutting off the fuel, keeping the starter and the motor in the off state, keeping the clutch in the fully open state, and controlling the gear to remain in the forward gear or the reverse gear.

[0109] Optionally, the determination module 502 is further used to: determine the target start-stop mode as the first stop-start mode in response to the multidimensional data set collected and updated in real time satisfying the first start trigger condition when the multidimensional data set satisfies the following third condition; the third condition includes: determining that the light hybrid system has no fault according to the fault parameter of the light hybrid system, determining that the motor has no fault according to the fault parameter of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the parking gear or neutral gear, and the motor torque is higher than a preset start threshold; the first start trigger condition is to meet at least one of the following: determining that the air conditioner has cooling or heating requirements according to the air conditioner operation parameter, the brake vacuum is lower than the preset brake threshold, the remaining battery capacity is lower than the second preset power threshold, the accelerator pedal opening is greater than the preset acceleration threshold, the gear is switched to the forward gear or the reverse gear, and determining that the start-stop function is turned off according to the start-stop function switch parameter; the first stop-start mode includes: controlling the engine fuel injection ignition, keeping the starter in an off state, controlling the motor to switch to an electric drive state, keeping the clutch in a fully open state, and controlling the gear to remain in the parking gear or neutral gear.

[0110] Optionally, the determination module 502 is further used to: determine that the target start-stop mode is the second stop-start mode in response to the multidimensional data set collected and updated in real time satisfying the second start trigger condition when the multidimensional data set satisfies the following fourth condition; the fourth condition includes: determining that the light hybrid system has no fault according to the fault parameters of the light hybrid system, determining that the motor has no fault according to the fault parameters of the motor, determining that the start-stop function is turned on according to the start-stop function switch parameters, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset start threshold, and determining that the brake master cylinder pressure is greater than the preset pressure threshold according to the brake pedal opening; the second start trigger condition is to meet at least one of the following: determining that the air conditioner has cooling or heating requirements according to the air conditioner operation parameters, the brake vacuum is lower than the preset brake threshold, the battery remaining capacity is lower than the second preset power threshold, and determining that the start-stop function is turned off according to the start-stop function switch parameters; the second stop-start mode includes: controlling the engine fuel injection ignition, keeping the starter in the off state, controlling the motor to switch to the electric drive state, keeping the clutch in the fully open state, and controlling the gear to remain in the forward gear or the reverse gear.

[0111] Optionally, the above-mentioned determination module 502 is also used for: in response to determining that a fault exists in the mild hybrid system according to the mild hybrid system fault parameters in the multidimensional data set, determining that the target start-stop mode is a first fault shutdown mode, wherein the first fault shutdown mode includes: controlling the mild hybrid vehicle to turn on the limp mode and generating a system fault message, the system fault message is used to assist the driver in parking and stopping the mild hybrid vehicle; in response to determining that a fault exists in the motor or the motor torque is not higher than a preset starting threshold according to the motor fault parameters in the multidimensional data set, determining that the target start-stop mode is a second fault shutdown mode, wherein the second fault shutdown mode includes: controlling the starter to switch to the on state, receiving a fault level signal corresponding to the motor, and controlling the starter to start the engine according to the fault level signal.

[0112] It should be noted that the above modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0113] According to another aspect of an embodiment of the present invention, a mild hybrid vehicle is provided, comprising an on-board memory and an on-board processor, wherein a computer program is stored in the on-board memory, and the on-board processor is configured to run the computer program to execute any one of the aforementioned engine start-stop control methods for a mild hybrid vehicle.

[0114] Optionally, in this embodiment, the vehicle-mounted processor may be configured to perform the following steps through a computer program:

[0115] Step S1, obtaining a multi-dimensional data set of a mild hybrid vehicle, wherein the multi-dimensional data set is used to characterize a real-time operating state and a fault state of the mild hybrid vehicle;

[0116] Step S2, determining a target start-stop method to be used based on the multi-dimensional data set;

[0117] Step S3, controlling the engine of the mild hybrid vehicle to start or stop according to the target start-stop mode.

[0118] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiment and its optional implementation modes, and this embodiment will not be described in detail here.

[0119] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0120] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0121] In the several embodiments provided by the present invention, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0122] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0123] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0124] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM), random access memory (RAM), mobile hard disk, magnetic disk or optical disk, etc., various media that can store program codes.

[0125] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for controlling engine start and stop of a mild hybrid vehicle, characterized in that: include: Acquire a multidimensional data set of the mild hybrid vehicle, wherein the multidimensional data set is used to characterize the real-time operating state and fault state of the mild hybrid vehicle, and the multidimensional data set includes: vehicle speed, gear position, motor torque, air conditioning operating parameters, brake vacuum, accelerator pedal opening, brake pedal opening, battery remaining capacity, engine water temperature, key status, start-stop function switch parameters, mild hybrid system fault parameters, and motor fault parameters; determining, according to the key state and the driving cycle count value of the mild hybrid vehicle, whether the mild hybrid vehicle is started for the first time in a current driving task; and determining, in response to the first start of the mild hybrid vehicle, a target start-stop mode to be used based on the multi-dimensional data set; The engine of the mild hybrid vehicle is controlled to start or stop according to the target start-stop mode.

2. The engine start-stop control method according to claim 1, characterized in that: Determining the target start-stop mode to be used based on the multidimensional data set includes: In the case where the multidimensional data set satisfies the following first condition, in response to the multidimensional data set collected and updated in real time satisfying the first shutdown trigger condition, the target start-stop mode is determined to be the first stop-stop mode, wherein: The first condition includes: determining that the mild hybrid system has no fault according to the mild hybrid system fault parameter, determining that the motor has no fault according to the motor fault parameter, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset start threshold, determining that the air conditioner has no cooling or heating demand according to the air conditioner operation parameter, the brake vacuum is higher than the preset brake threshold, the battery remaining capacity is higher than the first preset power threshold, and the engine water temperature is higher than the preset water temperature threshold; The first shutdown trigger condition includes: the gear is switched to the parking gear or the neutral gear; the first parking shutdown method includes: controlling the engine to shut down by cutting off fuel, keeping the starter and the motor in the off state, keeping the clutch in the fully open state, and controlling the gear to remain in the parking gear or the neutral gear.

3. The engine start-stop control method according to claim 1, characterized in that: Determining the target start-stop mode to be used based on the multidimensional data set further includes: In the case where the multidimensional data set satisfies the following second condition, in response to the multidimensional data set collected and updated in real time satisfying the second shutdown trigger condition, determining that the target start-stop mode is the second stop-stop mode; The second condition includes: determining that the mild hybrid system has no fault according to the mild hybrid system fault parameter, determining that the motor has no fault according to the motor fault parameter, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset start threshold, determining that the air conditioner has no cooling or heating demand according to the air conditioner operation parameter, the brake vacuum is higher than the preset brake threshold, the battery remaining capacity is higher than the first preset power threshold, the engine water temperature is higher than the preset water temperature threshold, and the brake pedal opening is not at the default value; The second shutdown triggering condition includes: the brake pedal opening increases until the brake master cylinder pressure is greater than a preset pressure threshold; The second parking and stopping mode includes: controlling the engine to shut down by cutting off fuel, keeping the starter and the motor in a closed state, keeping the clutch in a fully open state, and controlling the gear to remain in a forward gear or a reverse gear.

4. The engine start-stop control method according to claim 1, characterized in that: Determining the target start-stop mode to be used based on the multidimensional data set further includes: In the case where the multidimensional data set satisfies the following third condition, in response to the multidimensional data set collected and updated in real time satisfying the first start trigger condition, determining the target start-stop mode to be the first stop-start mode; The third condition includes: determining that the mild hybrid system has no fault according to the mild hybrid system fault parameter, determining that the motor has no fault according to the motor fault parameter, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the parking gear or neutral gear, and the motor torque is higher than a preset starting threshold; The first start triggering condition is to meet at least one of the following conditions: determining that the air conditioner has cooling or heating demand according to the air conditioner operation parameters, the brake vacuum is lower than a preset brake threshold, the battery remaining capacity is lower than a second preset power threshold, the accelerator pedal opening is greater than a preset acceleration threshold, and determining that the start-stop function is turned off according to the start-stop function switch parameters; The first parking-starting method includes: controlling the engine fuel injection and ignition, keeping the starter in an off state, controlling the motor to switch to an electric drive state, keeping the clutch in a fully open state, and controlling the gear to remain in a parking gear or a neutral gear.

5. The engine start-stop control method according to claim 1, characterized in that: Determining the target start-stop mode to be used based on the multidimensional data set further includes: In the case where the multidimensional data set satisfies the following fourth condition, in response to the multidimensional data set collected and updated in real time satisfying the second start trigger condition, determining that the target start-stop mode is the second stop-start mode; The fourth condition includes: determining that the mild hybrid system has no fault according to the mild hybrid system fault parameter, determining that the motor has no fault according to the motor fault parameter, determining that the start-stop function is turned on according to the start-stop function switch parameter, the vehicle speed is zero, the gear is in the forward gear or the reverse gear, the motor torque is higher than the preset starting threshold, and determining that the brake master cylinder pressure is greater than the preset pressure threshold according to the brake pedal opening; The second start triggering condition is to meet at least one of the following conditions: determining that the air conditioner has cooling or heating demand according to the air conditioner operation parameters, the brake vacuum is lower than a preset brake threshold, the battery remaining capacity is lower than a second preset power threshold, and determining that the start-stop function is turned off according to the start-stop function switch parameters; The second stop-start method includes: controlling the engine fuel injection and ignition, keeping the starter in an off state, controlling the motor to switch to an electric drive state, keeping the clutch in a fully open state, and controlling the gear to remain in a forward gear or a reverse gear.

6. The engine start-stop control method according to claim 1, characterized in that: Determining the target start-stop mode to be used based on the multidimensional data set further includes: In response to determining that a mild hybrid system has a fault according to the mild hybrid system fault parameter in the multi-dimensional data set, determining that the target start-stop mode is a first fault stop mode, wherein the first fault stop mode includes: controlling the mild hybrid vehicle to start a limp home mode and generating a system fault message, wherein the system fault message is used to assist a driver in performing parking control on the mild hybrid vehicle; In response to determining that a motor fault exists or that the motor torque is not higher than a preset starting threshold according to the motor fault parameters in the multidimensional data set, the target start-stop mode is determined to be a second fault stop mode, wherein the second fault stop mode includes: controlling the starter to switch to an on state, receiving a fault level signal corresponding to the motor, and controlling the starter to start the engine according to the fault level signal.

7. An engine start-stop control device for a mild hybrid vehicle, characterized in that: include: an acquisition module, for acquiring a multi-dimensional data set of the mild hybrid vehicle, wherein the multi-dimensional data set is used to characterize the real-time operating state and fault state of the mild hybrid vehicle, and the multi-dimensional data set includes: vehicle speed, gear position, motor torque, air conditioning operating parameters, brake vacuum, accelerator pedal opening, brake pedal opening, battery remaining capacity, engine water temperature, key status, start-stop function switch parameters, mild hybrid system fault parameters, and motor fault parameters; a determination module, configured to determine whether the mild hybrid vehicle is started for the first time in a current driving task according to the key state and the driving cycle count value of the mild hybrid vehicle; and in response to the first start of the mild hybrid vehicle, determine a target start-stop mode to be used based on the multi-dimensional data set; A control module is used to control the engine of the mild hybrid vehicle to start or stop according to the target start-stop mode.

8. A mild hybrid vehicle, characterized in that: It includes an on-board memory and an on-board processor, wherein the on-board memory stores a computer program, and the on-board processor is configured to run the computer program to execute the engine start-stop control method for the mild hybrid vehicle according to any one of claims 1 to 6.

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