Launch starting control method and apparatus for vehicle, storage medium, and vehicle

Abstract

The embodiments of the present disclosure provide a launch starting control method and apparatus for a vehicle, a storage medium, and a vehicle. The method comprises: in response to a launch starting signal of a vehicle, acquiring a turbocharger rotational speed lower limit value of an engine of the vehicle; on the basis of the turbocharger rotational speed lower limit value, determining an input rotational speed upper limit value of a transmission of the vehicle and an input rotational speed lower limit value of the transmission of the vehicle; on the basis of the input rotational speed upper limit value and the input rotational speed lower limit value, determining an input torque threshold of a gearbox of the vehicle; on the basis of the input torque threshold, adjusting an original input demand torque of the gearbox to obtain a target input demand torque of the gearbox; and on the basis of the target input demand torque, controlling launch starting of the vehicle.

Description

Vehicle launch control method, device, storage medium and vehicle

[0001] Cross-reference

[0002] This disclosure claims priority to Chinese patent application number 2023111276688, filed with the Patent Office of China on September 1, 2023, entitled “Launch start control method, device, storage medium and vehicle for vehicle”, the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of vehicles, and in particular to a vehicle launch control method, device, storage medium, and vehicle. Background Art

[0004] Currently, in the current vehicle launch control method, a large slip difference is usually maintained through the transmission clutch and a large torque is maintained at the wheel end. When the driver releases the brake pedal, the engine torque increases rapidly, thereby driving the entire vehicle. During the torque reserve stage, the large torque and large slip difference of the engine will put a very severe test on the thermal management system of the transmission. However, in hybrid vehicles, due to the rapid torque response characteristics of the drive motor, torque reserve can be performed through the drive motor during the torque reserve stage, thereby reducing the slip heat load loss of the clutch friction plate, resulting in a technical problem of requiring sufficiently large power generation power due to the need to reserve a large torque for controlling the vehicle's launch motor.

[0005] Currently, no effective solution has been proposed to the technical problem that a sufficiently large power generation power is required due to the need to reserve a large torque for controlling the launch motor of the vehicle.

[0006] Summary of the Invention

[0007] The embodiments of the present disclosure provide a vehicle launch control method, device, storage medium, and vehicle to at least solve the technical problem of requiring sufficiently large power generation power due to the need to reserve large torque for controlling the vehicle's launch motor.

[0008] According to one aspect of an embodiment of the present disclosure, a vehicle launch control method is provided. The method may include: obtaining a turbocharger speed lower limit value of the vehicle's engine in response to a vehicle launch signal; determining an upper input speed limit value and a lower input speed limit value of the vehicle's transmission based on the turbocharger speed lower limit value; determining an input torque threshold value of the vehicle's transmission based on the upper input speed limit value and the lower input speed limit value; adjusting an original input demand torque of the transmission based on the input torque threshold value to obtain a target input demand torque of the transmission; and controlling a vehicle launch control based on the target input demand torque.

[0009] Optionally, based on the turbocharger speed lower limit value, the input speed upper limit value of the vehicle's transmission and the input speed lower limit value of the vehicle's transmission are determined, including: summing the turbocharger speed lower limit value and the engine speed reference value to obtain the input speed upper limit value; and determining the turbocharger speed lower limit value as the input speed lower limit value.

[0010] Optionally, based on the input speed upper limit and the input speed lower limit, an input torque threshold of the vehicle's transmission is determined, including: in response to the vehicle's transmission control unit receiving the input speed upper limit, the input speed lower limit and the launch start signal sent by the vehicle controller of the vehicle, determining the input torque threshold based on the heat dissipation power of the vehicle.

[0011] Optionally, the original input demand torque of the transmission is adjusted based on the input torque threshold to obtain a target input demand torque of the transmission, including: determining the input demand torque based on the gear ratio of the transmission; determining the target torque based on the input torque threshold and the input demand torque, wherein the target torque is used to represent the minimum torque selected from the input torque threshold and the input demand torque by comparing the input torque threshold and the input demand torque; and adjusting the original input demand torque based on the target torque to obtain the target input demand torque.

[0012] Optionally, based on the target input demand torque, the vehicle launch is controlled, including: based on the target input demand torque, the torque of the engine is distributed to obtain a target engine torque, and based on the target input demand torque, the torque of the vehicle's motor is distributed to obtain a target motor torque; based on the target engine torque and the target motor torque, the vehicle launch is controlled.

[0013] Optionally, based on the target input demand torque, the engine torque is distributed to obtain the target engine torque, including: determining the external characteristic torque of the engine based on the target input demand torque and the engine speed; and determining the target engine torque based on the external characteristic torque.

[0014] Optionally, based on the target input demand torque, the torque of the vehicle's motor is distributed to obtain the target motor torque, including: obtaining the power of the vehicle's high-voltage accessories and the charging capacity of the vehicle's battery; determining the first torque of the motor based on the power and charging capacity; and determining the target motor torque based on the first torque and the target input demand torque.

[0015] According to one aspect of an embodiment of the present disclosure, a vehicle launch control device is provided. The device may include: a first response unit for obtaining a lower turbocharger speed limit of the vehicle's engine in response to a launch signal; a first determination unit for determining an upper input speed limit and a lower input speed limit of the vehicle's transmission based on the lower turbocharger speed limit; a second determination unit for determining an input torque threshold of the vehicle's transmission based on the upper input speed limit and the lower input speed limit; an adjustment unit for adjusting an original input torque demand of the transmission based on the input torque threshold to obtain a target input torque demand of the transmission; and a control unit for controlling a launch control of the vehicle based on the target input torque demand.

[0016] According to another aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device containing the computer-readable storage medium is controlled to execute the vehicle launch control method of the present disclosure.

[0017] According to another aspect of an embodiment of the present disclosure, a processor is provided, which is configured to run a program, wherein when the program is run by the processor, the launch control method for a vehicle according to an embodiment of the present disclosure is executed.

[0018] According to another aspect of the embodiments of the present disclosure, a vehicle is further provided, and the vehicle is used to execute the launch control method for the vehicle according to the embodiments of the present disclosure.

[0019] According to another aspect of an embodiment of the present disclosure, a computer program product is further provided, including a computer program. When the computer program is executed by a processor, the computer program implements the vehicle launch control method of the present disclosure.

[0020] According to another aspect of an embodiment of the present disclosure, a computer program product is provided, including a non-volatile computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the launch control method for a vehicle in the present disclosure is implemented.

[0021] According to another aspect of an embodiment of the present disclosure, a computer program is further provided. When the computer program is executed by a processor, the launch control method for a vehicle of the present disclosure is implemented.

[0022] According to another aspect of an embodiment of the present disclosure, a computing device is provided, including:

[0023] memory and processor;

[0024] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the launch control method for the vehicle in the present disclosure is implemented.

[0025] According to another aspect of the present disclosure, an electronic device is provided, including:

[0026] one or more processors; and

[0027] A memory associated with one or more processors is used to store program instructions. When the program instructions are read and executed by the one or more processors, the launch control method of the vehicle in the present disclosure is implemented.

[0028] In an embodiment of the present disclosure, in response to a vehicle launch signal, a turbocharger speed lower limit of the vehicle's engine is obtained. Based on the obtained turbocharger speed lower limit and an engine speed reference value, an upper input speed limit and a lower input speed limit of the vehicle's transmission are determined. In response to a transmission control unit receiving the upper input speed limit, the lower input speed limit, and the launch signal from a vehicle controller, a transmission input torque threshold is determined based on the vehicle's heat dissipation power. The original input demand torque of the transmission is adjusted based on the input torque threshold to obtain a target input demand torque of the transmission. Based on the obtained target input demand torque, the engine torque is distributed to obtain a target engine torque, and the motor torque is distributed to obtain a target motor torque. Based on the obtained target engine torque and target motor torque, a launch control of the vehicle is controlled, thereby reducing the engine torque plateau. This further solves the technical problem of requiring a sufficiently large generator power due to the large torque reserve required to control the vehicle's launch motor, thereby avoiding the technical effect of requiring a sufficiently large generator power due to the large torque reserve required to control the vehicle's launch motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0030] FIG1 is a flow chart of a launch control method for a vehicle according to an embodiment of the present disclosure;

[0031] FIG2 is a schematic diagram of a launch control controller and interaction signals according to an embodiment of the present disclosure;

[0032] FIG3 is a schematic diagram of a launch control device for a vehicle according to an embodiment of the present disclosure;

[0033] FIG4 is a schematic diagram of the structure of a computer-readable storage medium according to an embodiment of the present disclosure;

[0034] FIG5 is a schematic diagram of the structure of a processor according to an embodiment of the present disclosure;

[0035] FIG6 is a schematic structural diagram of a computer product according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present disclosure.

[0037] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure 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 numbers used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure 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 clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] According to an embodiment of the present disclosure, a launch control method for a vehicle is provided. It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system, such as a set of computer-executable instructions. Moreover, although a logical sequence is shown in the flowcharts, in some cases, the steps shown or described may be executed in a different order than shown.

[0039] FIG1 is a flow chart of a launch control method for a vehicle according to an embodiment of the present disclosure. The method may include the following steps:

[0040] Step S101 : In response to a launch start signal of the vehicle, a lower limit value of a turbocharger speed of an engine of the vehicle is obtained.

[0041] In the technical solution provided in step S101 of the present disclosure, the launch control signal may be used to indicate that the vehicle triggers a launch control, and the turbocharger speed lower limit may be represented by EngSpdTclowLimt.

[0042] Optionally, if the vehicle triggers the launch start condition, the launch start flag is set (eg, LCFlg=1), and a launch start signal is sent via the vehicle control unit (VCU) to obtain the lower limit of the turbocharger speed of the vehicle's engine.

[0043] Optionally, the conditions for triggering launch control must meet the following conditions at the same time: the driver turns off the vehicle stability control system (Electronic Stability Controller, abbreviated as ESC), the driver shifts the gear into S gear, the electronic parking brake system (Electrical Park Brake, abbreviated as EPB) is released and the automatic parking switch (AutoHold) is in the off state, the vehicle speed is less than a certain value (for example, the vehicle speed is less than 1 km / h), the driver steps on the brake pedal, the driver's throttle opening is greater than 100% and the forced downshift (Kick down) is triggered, and the system high voltage power-up is completed (for example, the main positive relay and the main and auxiliary relays are closed).

[0044] In step S102 , based on the turbocharger speed lower limit, an upper input speed limit of a transmission of the vehicle and a lower input speed limit of the transmission of the vehicle are determined.

[0045] In the technical solution provided in step S102 of the present disclosure, the upper limit value of the input speed of the transmission can be used to control the maximum input speed of the transmission, and the lower limit value of the input speed of the transmission can be used to control the minimum input speed of the transmission.

[0046] Optionally, after obtaining the turbocharger speed lower limit value of the vehicle's engine in response to the vehicle's launch start signal, the input speed upper limit value of the vehicle's transmission and the input speed lower limit value of the vehicle's transmission are determined based on the turbocharger speed lower limit value. For example, the input speed upper limit value and the input speed lower limit value can be determined based on the turbocharger speed lower limit value and the engine speed reference value, wherein the input speed upper limit value can be represented by ATInputSpdUp and the input speed lower limit value can be represented by ATInputSpdLo.

[0047] In step S103 , an input torque threshold of a transmission of the vehicle is determined based on an upper limit value of the input speed and a lower limit value of the input speed.

[0048] In the technical solution provided in the above step S103 of the present disclosure, the above input torque threshold may be used to limit the input torque of a transmission control unit (TCU).

[0049] Optionally, after determining the upper input speed limit value and the lower input speed limit value of the vehicle's transmission based on the lower turbocharger speed limit value, the input torque threshold value of the vehicle's transmission is determined based on the input speed upper limit value and the input speed lower limit value. For example, the VCU sends the input speed upper limit value, the input speed lower limit value and the launch start flag to the TCU. The TCU can calculate the input torque threshold value of the TCU based on the maximum heat dissipation power capability of the system, thereby limiting the input torque of the TCU, where the input torque threshold value can be represented by ATTrqLimit.

[0050] Step S104 : adjusting the original required input torque of the transmission based on the input torque threshold to obtain a target required input torque of the transmission.

[0051] In the technical solution provided in step S104 of the present disclosure, the original input demand torque may be used to represent the input torque of the transmission of the current vehicle before the launch control is triggered, and the target input demand torque may be used to represent the final torque requirement at the input end of the transmission.

[0052] Optionally, after determining the input torque threshold of the vehicle's transmission based on the input speed upper limit and the input speed lower limit, the original input demand torque of the transmission is adjusted based on the input torque threshold to obtain the target input demand torque of the transmission. For example, according to the input torque threshold and the torque demand ATInputDrvTrqDmd at the transmission input end, the original input demand torque of the transmission is adjusted to obtain the target input demand torque, that is, the final torque demand at the transmission input end is obtained, where the target input demand torque can be represented by TDrvAinput.

[0053] Step S105 : Based on the target input required torque, the vehicle is controlled to launch.

[0054] In the technical solution provided in the above step S105 of the present disclosure, after the original input demand torque of the transmission is adjusted based on the input torque threshold to obtain the target input demand torque of the transmission, the vehicle's launch is controlled based on the target input demand torque. For example, according to the target input demand torque, the torque of the engine and the torque of the motor are respectively distributed to control the launch of the vehicle.

[0055] Optionally, after distributing the engine torque and the motor torque respectively according to the target input demand torque, the TCU controls the clutch according to the input speed upper limit and input speed lower limit sent by the VCU so that the speed can be maintained within the range limited by the VCU.

[0056] In the above steps S101 to S105 of the present disclosure, in response to the launch start signal of the vehicle, a turbocharger speed lower limit value of the engine of the vehicle is obtained, and based on the obtained turbocharger speed lower limit value and the engine speed reference value, an input speed upper limit value and an input speed lower limit value of the transmission of the vehicle can be determined. In response to the transmission control unit of the vehicle receiving the input speed upper limit value, the input speed lower limit value and the launch start signal sent by the vehicle controller of the vehicle, an input torque threshold value of the transmission can be determined according to the heat dissipation power of the vehicle, and the original input demand torque of the transmission is adjusted according to the input torque threshold value to obtain the transmission torque. The target input demand torque is distributed to the engine torque according to the obtained target input demand torque to obtain the target engine torque, and the torque of the motor is distributed to obtain the target motor torque. According to the obtained target engine torque and target motor torque, the vehicle's launch can be controlled, thereby achieving the purpose of reducing the engine torque platform, and further solving the technical problem of requiring a sufficiently large power generation power due to the need to reserve a large torque for controlling the vehicle's launch motor, and achieving the technical effect of avoiding the need for a sufficiently large power generation power due to the need to reserve a large torque for controlling the vehicle's launch motor.

[0057] The above method of this embodiment is further introduced below.

[0058] As an optional embodiment, step S102 determines the upper input speed limit value of the vehicle's transmission and the lower input speed limit value of the vehicle's transmission based on the lower turbocharger speed limit value, including: summing the lower turbocharger speed limit value and the engine speed reference value to obtain the upper input speed limit value; and determining the lower turbocharger speed limit value as the lower input speed limit value.

[0059] In this embodiment, the speed reference value of the engine may be set to 500, which is merely an example and not a specific limitation.

[0060] Optionally, after obtaining the lower limit value of the turbocharger speed of the vehicle's engine in response to the vehicle's launch start signal, the upper limit value of the input speed can be obtained by summing the lower limit value of the turbocharger speed and the speed reference value, and the lower limit value of the turbocharger speed can be determined as the lower limit value of the input speed.

[0061] Alternatively, when the speed reference value is 500, as shown in the following equation (1), by summing the turbocharger speed lower limit value EngSpdTclowLimt and the speed reference value 500, the input speed upper limit value ATInputSpdUp can be obtained. As shown in the following equation (2), the turbocharger speed lower limit value EngSpdTclowLimt can be determined as the input speed lower limit value ATInputSpdLo. ATInputSpdUp=EngSpdTclowLimt+500 (1) ATInputSpdLo=EngSpdTclowLimt (2)

[0062] As an optional embodiment, step S103 determines the input torque threshold of the vehicle's transmission based on the input speed upper limit and the input speed lower limit, including: in response to the vehicle's transmission control unit receiving the input speed upper limit, the input speed lower limit, and the launch start signal sent by the vehicle controller of the vehicle, determining the input torque threshold based on the heat dissipation power of the vehicle.

[0063] In this embodiment, the heat dissipation power may be the maximum heat dissipation power of the vehicle control system.

[0064] Optionally, after determining the upper input speed limit value and the lower input speed limit value of the vehicle's transmission based on the lower turbocharger speed limit value, the upper input speed limit value, the lower input speed limit value and the launch start signal are sent to the TCU through the VCU. When the TCU receives the sent upper input speed limit value, the lower input speed limit value and the launch start signal, the TCU can calculate the input torque threshold value ATTrqLimit based on the maximum heat dissipation power of the vehicle control system.

[0065] Optionally, if the vehicle activates the launch mode, the VCU enables the driver demand torque table (Map) for the sports mode and looks up the driver demand torque table based on the driver's pedal and vehicle speed. The VCU is internally designed with a driver demand torque table for normal mode, a driver demand torque table for economic mode, and a driver demand torque table for sports mode. The driver demand torque for sports mode is greater than the driver demand torque for normal mode and the driver demand torque for economic mode at the same vehicle speed and pedal opening.

[0066] As an optional embodiment, step S104 adjusts the original input demand torque of the transmission based on the input torque threshold to obtain the target input demand torque of the transmission, including: determining the input demand torque based on the gear ratio of the transmission; determining the target torque based on the input torque threshold and the input demand torque, wherein the target torque is used to represent the minimum torque selected from the input torque threshold and the input demand torque by comparing the input torque threshold and the input demand torque; and adjusting the original input demand torque based on the target torque to obtain the target input demand torque.

[0067] In this embodiment, the gear ratio may be the gear ratio (GearRatio) reported by the TCU, and the input demand torque may be used to represent the torque demand at the input end of the transmission. For example, the input demand torque may be represented by ATInputDrvTrqDmd.

[0068] Optionally, after determining the input torque threshold of the vehicle's transmission based on the input speed upper limit and the input speed lower limit, the VCU can calculate the torque demand ATInputDrvTrqDmd at the transmission input end according to the gear ratio GearRatio reported by the TCU, determine the minimum torque between the input torque threshold ATTrqLimit and the torque demand ATInputDrvTrqDmd at the transmission input end, and adjust the original input demand torque according to the determined minimum torque, thereby obtaining the target input demand torque TDrvAinput, that is, obtaining the final torque demand at the transmission input end.

[0069] As an optional embodiment, step S105 controls the vehicle launch based on the target input demand torque, including: distributing the torque of the engine based on the target input demand torque to obtain the target engine torque, and distributing the torque of the vehicle's motor based on the target input demand torque to obtain the target motor torque; and controlling the vehicle launch based on the target engine torque and the target motor torque.

[0070] In this embodiment, the target engine torque may be used to represent the engine demand torque, and the target motor torque may be used to represent the motor demand torque, wherein the target engine torque may be represented by TEng, and the target motor torque may be represented by Max.

[0071] Optionally, after adjusting the original input demand torque of the transmission based on the input torque threshold to obtain the target input demand torque of the transmission, the torque of the engine is distributed according to the target input demand torque TDrvAinput to obtain the target engine torque, and the torque of the motor is distributed to obtain the target motor torque. Based on the obtained target engine torque and target motor torque, the vehicle's launch can be controlled.

[0072] Optionally, the engine torque is distributed according to the target input demand torque TDrvAinput to obtain the target engine torque, which can be achieved by the following steps: according to the engine speed (Engspd), the engine external characteristic torque (MaxEngTrq) is looked up in the table to obtain the target engine torque TEng.

[0073] Optionally, the torque of the motor is distributed according to the target input demand torque TDrvAinput to obtain the target motor torque, which can be achieved by the following steps: selecting the maximum torque from the difference between the target input demand torque and the target engine torque (TDrvAinput-TEng) and the negative first torque of the motor (-TMGenMax), and determining the maximum torque as the target motor torque Max.

[0074] As an optional embodiment, the engine torque is distributed based on the target input demand torque to obtain the target engine torque, including: determining the external characteristic torque of the engine based on the target input demand torque and the engine speed; determining the target engine torque based on the external characteristic torque.

[0075] In this embodiment, the engine speed can be represented by Engspd.

[0076] Optionally, after adjusting the original input demand torque of the transmission based on the input torque threshold to obtain the target input demand torque of the transmission, the target engine torque TEng can be obtained by looking up the external characteristic torque MaxEngTrq of the engine according to the engine speed Engspd.

[0077] As an optional embodiment, the torque of the vehicle's motor is distributed based on the target input demand torque to obtain the target motor torque, including: obtaining the power of the vehicle's high-voltage accessories and the charging capacity of the vehicle's battery; determining the first torque of the motor based on the power and charging capacity; and determining the target motor torque based on the first torque and the target input demand torque.

[0078] In this embodiment, the power of the vehicle's high-voltage accessories can be represented by AccessoryPwr, the charging capacity of the vehicle's battery can be represented by BatChrPwrLimit, and the first torque of the motor can be used to represent the maximum power generation torque of the motor, where the first torque of the motor can be represented by TMGenMax.

[0079] Optionally, the power of the high-voltage accessory can be calculated by the following formula (3), and the first torque of the motor can be calculated by the following formula (4): AccessoryPwr = ACpwr + DCDCpwr (3) TMGenMax = (AccessoryPwr + BatChrPwrLimit) * 9550 / TMSpd (4)

[0080] Among them, ACpwr can be used to represent the air conditioner power, DCDCpwr can be used to represent the DC to DC power, and TMSpd can be used to represent the motor speed.

[0081] Optionally, after adjusting the original input demand torque of the transmission based on the input torque threshold to obtain the target input demand torque of the transmission, the air conditioning power ACpwr and the DC to DC power DCDCpwr are summed to obtain the power AccessoryPwr of the high-voltage accessory, and then based on the power AccessoryPwr of the high-voltage accessory and the charging capacity BatChrPwrLimit of the battery, the first torque TMGenMax of the motor can be determined, and the maximum torque is selected between TDrvAinput-TEng and -TMGenMax, and the maximum torque is determined as the target motor torque Max.

[0082] This embodiment obtains vehicle operating status information and, in response to a launch signal from the vehicle, obtains a lower turbocharger speed limit of the vehicle's engine. Based on the obtained lower turbocharger speed limit and an engine speed reference value, an upper input speed limit and a lower input speed limit of the vehicle's transmission are determined. In response to a transmission control unit receiving the upper input speed limit, the lower input speed limit, and the launch signal from a vehicle controller, a transmission input torque threshold is determined based on the vehicle's heat dissipation power. The original input demand torque of the transmission is adjusted based on the input torque threshold to obtain a target input demand torque of the transmission. Based on the obtained target input demand torque, the engine torque is distributed to obtain a target engine torque, and the motor torque is distributed to obtain a target motor torque. Based on the obtained target engine torque and target motor torque, the vehicle launch control is performed. This solves the technical problem of requiring a sufficiently large generator power due to the large torque reserve required to control the launch motor of the vehicle, thereby achieving the technical effect of avoiding the need for a sufficiently large generator power due to the large torque reserve required to control the launch motor of the vehicle.

[0083] The technical solutions of the embodiments of the present disclosure are illustrated below with reference to preferred implementations.

[0084] Current launch control methods for vehicles typically maintain a large slip differential through the transmission clutch and a high torque at the wheel. When the driver releases the brake pedal, the engine torque rapidly increases, driving the vehicle. During the torque reserve phase, the high engine torque and large slip differential place severe strain on the transmission's thermal management system. However, in hybrid vehicles, due to the rapid torque response of the drive motor, torque reserve can be provided by the drive motor during the torque reserve phase, mitigating the slippage heat loss of the clutch friction plate. This leads to the technical problem of requiring a sufficiently large generator power due to the large torque reserve required to control the launch motor. Therefore, a launch control method for vehicles is needed to avoid the need for a sufficiently large generator power due to the large torque reserve required to control the launch motor.

[0085] In a related technology, a launch control method is disclosed, which is applied to a vehicle controller, including: when the launch function of the vehicle is activated, controlling the vehicle to enter the idle electric four-wheel drive mode, and controlling the engine speed to increase to the target speed; in the idle electric four-wheel drive mode, the front drive motor and the rear drive motor of the vehicle are in the driving state, the engine is in the idle state, and the clutch is in the disengaged state; when the engine speed increases to the target speed, controlling the clutch to close to the slipping state; when it is detected that the brake pedal is released, controlling the clutch to fully close so that the vehicle switches from the idle electric four-wheel drive mode to the direct drive mode; in the direct drive mode, the front drive motor, the rear drive motor and the engine are all in the driving state. However, this method only controls the engine speed to increase to the target speed in advance and controls the clutch to close to the slipping state when the vehicle's launch function is activated. When the brake pedal is detected to be released, the method quickly controls the clutch to close completely so that the engine can quickly output torque and cooperate with the front-wheel drive motor and the rear-wheel drive motor to provide the vehicle with maximum torque output. It is impossible to ensure the wheel-end reserve torque while reasonably setting the torque reserve of the drive motor according to the power battery SOC and accessory power, and setting the engine speed / torque to fully consider the minimum speed of the engine in the boost zone.

[0086] However, the disclosed embodiment proposes a control method for the launch control of a P2 configuration hybrid vehicle. While ensuring the wheel-end reserve torque, the torque reserve of the drive motor is reasonably set according to the state of charge (SOC) of the power battery and the accessory power. In addition, when setting the engine speed / torque, the minimum speed of the engine in the boost zone is fully considered, thereby bypassing the slow torque climb stage in the non-boost stage of the engine, achieving the purpose of reducing the engine torque platform, solving the technical problem of requiring a sufficiently large power generation power due to the need to reserve a large torque for the launch control motor of the vehicle, and achieving the technical effect of avoiding the need for a sufficiently large power generation power due to the need to reserve a large torque for the launch control motor of the vehicle.

[0087] Figure 2 is a schematic diagram of a launch control-related controller and its interaction signals according to an embodiment of the present disclosure. As shown in Figure 2, an engine management system (EMS) 201 can communicate data with a vehicle control unit 202, a vehicle stability control system 203 can communicate data with the vehicle control unit 202, a battery management system (BMS) 204 can communicate data with the vehicle control unit 202, a transmission control unit 205 can communicate data with the vehicle control unit 202, and a motor control unit (MCU) 206 can communicate data with the vehicle control unit 202.

[0088] Optionally, the engine management system 201 can send the actual engine torque / speed to the vehicle control unit 202, the vehicle control unit 202 can send the engine torque demand to the engine management system 201, the vehicle stability control system 203 can send the braking status / ESC status to the vehicle control unit 202, the battery management system 204 can send the battery state of charge (State Of Charge, abbreviated as SOC) / charging and discharging power capability to the vehicle control unit 202, the transmission control unit 205 can send the torque limit value to the vehicle control unit 202, the vehicle control unit 202 can send the speed limit value to the transmission control unit 205, the motor control unit 206 can send the motor torque capability to the vehicle control unit 202, and the vehicle control unit 202 can send the motor torque demand to the motor control unit 206.

[0089] Optionally, a launch control method for a hybrid electric vehicle of a P2 configuration may include the following:

[0090] Optionally, the conditions for triggering the launch control must meet the following conditions at the same time: the driver turns off the vehicle stability control system, the driver shifts into S gear, the electronic parking brake system is released and the automatic parking switch (AutoHold) is in the off state, the vehicle speed is less than a certain value, the driver steps on the brake pedal, the driver's throttle opening is greater than 100% and the forced downshift (Kick down) is triggered, and the system high voltage power-on is completed (for example, the main positive relay and the main and auxiliary relays are closed). That is, if the above conditions are met at the same time, the launch control flag is set (for example, LCFlg=1).

[0091] The launch flag is reset (for example, LCFlg=0) only when one of the following conditions is met: ESC is turned on, the vehicle is not in S gear, the vehicle speed is greater than a certain value (for example, 10km / h) and the brake is applied, EPB is clamped or Autohold is turned on, the accelerator pedal opening is less than 100%, or the high-voltage system is faulty or power is off.

[0092] Optionally, when the VCU internal energy management module receives LCFlg=1, it expands the driving charging SOC upper limit. The expanded upper limit is the battery charging upper limit. At the same time, the battery charging capacity BatChrPwrLimit is calculated. The specific calculation is the battery available charging capacity reported by the power battery BMS controller * F, where F is the available charging coefficient. The charging coefficient is referred to the following table:

[0093] Table 1 Relationship between battery charging limit and battery charging capacity

[0094] The driving charging SOC upper limit may be the upper limit of the driving charging SOC allowed in order to provide energy regulation capability for the engine. For example, in the launch start mode, in order to prevent the driver from not releasing the brake pedal all the time, a larger storage space is provided for the excess power generation.

[0095] Optionally, for a hybrid electric vehicle (HEV), assuming that the upper limit of the battery life is 70%, the upper limit of the battery charge is generally designed to be 65%.

[0096] Optionally, the VCU calculates the maximum power generation torque TMGenMax of the motor based on the accessory power AccessoryPwr reported by the high-voltage accessory and the battery charging capacity BatChrPwrLimit, where the accessory power AccessoryPwr can be calculated by the following formula (3), and the maximum power generation torque TMGenMax of the motor can be calculated by the following formula (4): AccessoryPwr=ACpwr+DCDCpwr (3) TMGenMax=(AccessoryPwr+BatChrPwrLimit)*9550 / TMSpd (4)

[0097] Among them, ACpwr can be used to represent the air conditioner power, DCDCpwr can be used to represent the DC to DC power, and TMSpd can be used to represent the motor speed.

[0098] Optionally, the VCU determines the lower and upper limits of the transmission input speed based on the engine turbocharger speed lower limit EngSpdTclowLimt, which can be expressed as follows: ATInputSpdUp=EngSpdTclowLimt+500 (1) ATInputSpdLo=EngSpdTclowLimt (2)

[0099] Among them, ATInputSpdUp can be used to indicate the upper limit of the transmission input speed, and ATInputSpdLo can be used to indicate the lower limit of the transmission input speed.

[0100] Optionally, the VCU sends the lower limit and upper limit of the transmission input speed and the launch start flag to the TCU, and the TCU calculates the TCU input torque limit ATTrqLimit according to the maximum heat dissipation power of the vehicle control system.

[0101] Optionally, when the launch mode is activated, the VCU enables the driver demand torque table Map for the sport mode and looks up the driver demand torque table based on the driver's pedal and vehicle speed. The VCU is internally designed with a driver demand torque table for normal mode, a driver demand torque table for economic mode and a driver demand torque table for sport mode. The driver demand torque for sport mode is greater than the driver demand torque for normal mode and the driver demand torque for economic mode at the same vehicle speed and pedal opening.

[0102] Optionally, the VCU calculates the driver's transmission input torque demand ATInputDrvTrqDmd according to the gear ratio GearRatio reported by the VCU.

[0103] Optionally, according to the driver's transmission input torque demand ATInputDrvTrqDmd, the driver's final torque demand at the transmission input TDrvAinput=min(ATInputDrvTrqDmd, ATTrqLimit) can be determined.

[0104] Optionally, when the VCU determines that LCFlg=1, it controls the engine to start and shields the internal braking priority function. The VCU distributes the engine and motor torque according to TDrvAinput to obtain the engine required torque TEng=Lookup(Engspd, MaxEngTrq) and the motor required torque Max(TDrvAinput-TEng, -TMGenMax). When the driver presses the brake pedal and the accelerator pedal at the same time, the driver's required torque is limited to a very small value.

[0105] Optionally, the engine required torque TEng may be obtained by looking up the engine external characteristic torque MaxEngTrq in a table according to the engine speed Engspd.

[0106] Optionally, the TCU controls the clutch according to the lower and upper limits of the transmission input speed sent by the VCU, so that the speed can be maintained within the range limited by the VCU.

[0107] Optionally, when the driver releases the brake pedal, the VCU controls the engine torque to be the engine external characteristic torque, and the motor torque to be Min(TDrvAinput-TEng, TMMax), where TMMax can be used to represent the maximum torque reported by the motor.

[0108] In this embodiment, the engine management system can communicate data with the vehicle control unit, the vehicle stability control system can communicate data with the vehicle control unit, the battery management system can communicate data with the vehicle control unit, the transmission control unit can communicate data with the vehicle control unit, and the motor control unit can communicate data with the vehicle control unit, thereby solving the technical problem of requiring a sufficiently large power generation power due to the need to reserve a large torque for controlling the vehicle's launch motor, and achieving the technical effect of avoiding the need for a sufficiently large power generation power due to the need to reserve a large torque for controlling the vehicle's launch motor.

[0109] According to an embodiment of the present disclosure, a vehicle launch control device is also provided. It should be noted that the vehicle launch control device can be used to execute the vehicle launch control method of embodiment 1.

[0110] FIG3 is a schematic diagram of a vehicle launch control device according to an embodiment of the present disclosure. As shown in FIG3 , the vehicle launch control device 300 may include: a first response unit 301 , a first determination unit 302 , a second determination unit 303 , an adjustment unit 304 , and a control unit 305 .

[0111] The first response unit 301 is configured to obtain a lower limit value of a turbocharger speed of an engine of the vehicle in response to a launch start signal of the vehicle.

[0112] The first determining unit 302 is configured to determine an upper input speed limit value and a lower input speed limit value of a transmission of the vehicle based on a lower turbocharger speed limit value.

[0113] The second determining unit 303 is configured to determine an input torque threshold of a transmission of the vehicle based on an upper input speed limit and a lower input speed limit.

[0114] The adjusting unit 304 is configured to adjust the original required input torque of the transmission based on the input torque threshold to obtain a target required input torque of the transmission.

[0115] The control unit 305 is configured to control the vehicle launch based on the target input required torque.

[0116] Optionally, the first determination unit 302 may include: a summing module for summing the turbocharger speed lower limit value and the engine speed reference value to obtain the input speed upper limit value; and a first determination module for determining the turbocharger speed lower limit value as the input speed lower limit value.

[0117] Optionally, the second determination unit 303 may include: a response module, configured to determine the input torque threshold based on the heat dissipation power of the vehicle in response to the transmission control unit of the vehicle receiving the input speed upper limit value, the input speed lower limit value and the launch start signal sent by the vehicle controller of the vehicle.

[0118] Optionally, the adjustment unit 304 may include: a second determination module, used to determine the input demand torque based on the gear ratio of the transmission; a third determination module, used to determine the target torque based on the input torque threshold and the input demand torque, wherein the target torque is used to represent the minimum torque selected from the input torque threshold and the input demand torque by comparing the input torque threshold and the input demand torque; an adjustment module, used to adjust the original input demand torque based on the target torque to obtain the target input demand torque.

[0119] Optionally, the control unit 305 may include: a distribution module for distributing the torque of the engine based on the target input demand torque to obtain a target engine torque, and distributing the torque of the vehicle's motor based on the target input demand torque to obtain a target motor torque; and a control module for controlling the vehicle launch based on the target engine torque and the target motor torque.

[0120] Optionally, the allocation module may include: a first determination submodule, configured to determine the external characteristic torque of the engine based on the target input demand torque and the engine speed; and determine the target engine torque based on the external characteristic torque.

[0121] Optionally, the allocation module may include: an acquisition submodule for acquiring the power of the vehicle's high-voltage accessories and the charging capacity of the vehicle's battery; a second determination submodule for determining the first torque of the motor based on the power and charging capacity; and a third determination submodule for determining the target motor torque based on the first torque and the target input demand torque.

[0122] In this embodiment, a first response unit is used to obtain a lower limit value of a turbocharger speed of the vehicle's engine in response to a launch signal of the vehicle; a first determination unit is used to determine an upper limit value of an input speed of the vehicle's transmission and an lower limit value of an input speed of the vehicle's transmission based on the lower limit value of the turbocharger speed; a second determination unit is used to determine an input torque threshold of the vehicle's transmission based on the upper limit value of the input speed and the lower limit value of the input speed; an adjustment unit is used to adjust an original required input torque of the transmission based on the input torque threshold to obtain a target required input torque of the transmission; and a control unit is used to control the launch of the vehicle based on the target required input torque, thereby solving the technical problem of requiring a sufficiently large power generation power due to the need to reserve a large torque for controlling the launch motor of the vehicle, and achieving the technical effect of avoiding the need for a sufficiently large power generation power due to the need to reserve a large torque for controlling the launch motor of the vehicle.

[0123] According to an embodiment of the present disclosure, a computer-readable storage medium is further provided. FIG4 is a schematic structural diagram of a computer-readable storage medium according to an embodiment of the present disclosure. As shown in FIG4 , the storage medium 400 includes a stored program, wherein the program executes the launch control method for a vehicle in the present disclosure.

[0124] According to an embodiment of the present disclosure, a processor is also provided. FIG5 is a structural diagram of a processor according to an embodiment of the present disclosure. As shown in FIG5 , the processor 500 is configured to run a program, wherein the program executes the method in the above embodiment when run by the processor.

[0125] In the embodiment of the present disclosure, the processor 500 may execute the operating program of the method in the embodiment.

[0126] Optionally, the processor 500 can be configured to perform the following steps: in response to a vehicle's launch signal, obtain a turbocharger speed lower limit value of the vehicle's engine; based on the turbocharger speed lower limit value, determine an input speed upper limit value and an input speed lower limit value of the vehicle's transmission; based on the input speed upper limit value and the input speed lower limit value, determine an input torque threshold value of the vehicle's transmission; based on the input torque threshold value, adjust the original input demand torque of the transmission to obtain a target input demand torque of the transmission; and control the vehicle launch based on the target input demand torque.

[0127] According to an embodiment of the present disclosure, a vehicle is further provided, which is used to execute any one of the vehicle launch control methods disclosed in the present disclosure.

[0128] According to an embodiment of the present disclosure, a computer program product is further provided. FIG6 is a schematic structural diagram of a computer product according to an embodiment of the present disclosure. As shown in FIG6 , the computer program 600 includes a computer program that, when executed by a processor, implements the vehicle launch control method of the present disclosure.

[0129] According to an embodiment of the present disclosure, a computer program product is also provided, including a non-volatile computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the vehicle launch control method in the present disclosure.

[0130] According to an embodiment of the present disclosure, a computer program is further provided. When the computer program is executed by a processor, the launch control method for a vehicle in the present disclosure is implemented.

[0131] Optionally, the computer program implements the following program codes when executed by the processor: in response to a launch signal of the vehicle, obtaining a lower limit value of the turbocharger speed of the vehicle's engine; determining an upper limit value of the input speed of the vehicle's transmission and a lower limit value of the input speed of the vehicle's transmission based on the lower limit value of the turbocharger speed; determining an input torque threshold of the vehicle's transmission based on the upper limit value of the input speed and the lower limit value of the input speed; adjusting an original input demand torque of the transmission based on the input torque threshold to obtain a target input demand torque of the transmission; and controlling the launch of the vehicle based on the target input demand torque.

[0132] According to an embodiment of the present disclosure, a computing device is further provided, including:

[0133] memory and processor;

[0134] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the launch control method for the vehicle in the present disclosure is implemented.

[0135] According to an embodiment of the present disclosure, an electronic device is further provided, including:

[0136] one or more processors; and

[0137] A memory associated with one or more processors is used to store program instructions. When the program instructions are read and executed by the one or more processors, the launch control method of the vehicle in the present disclosure is implemented.

[0138] The serial numbers of the above-mentioned embodiments of the present disclosure are for description only and do not represent the advantages or disadvantages of the embodiments.

[0139] In the above embodiments of the present disclosure, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0140] In the several embodiments provided in the present disclosure, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of units can be a logical function division. In actual implementation, there may be other division methods, such as 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.

[0141] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected to achieve the purpose of the present embodiment according to actual needs.

[0142] In addition, the functional units in the various embodiments of the present disclosure may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0143] 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 disclosure is essentially 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 enabling a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the various embodiments of the present disclosure. 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.

[0144] The above is only a preferred embodiment of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present disclosure. These improvements and modifications should also be regarded as within the scope of protection of the present disclosure. Industrial Applicability

[0145] The solution provided by the embodiment of the present disclosure can be applied in the process of vehicle control. In response to the vehicle's launch signal, the lower limit value of the turbocharger speed of the vehicle's engine is obtained; based on the lower limit value of the turbocharger speed, the upper limit value of the input speed of the vehicle's transmission and the lower limit value of the input speed of the vehicle's transmission are determined; based on the upper limit value of the input speed and the lower limit value of the input speed, the input torque threshold of the vehicle's transmission is determined; based on the input torque threshold, the original input demand torque of the transmission is adjusted to obtain the target input demand torque of the transmission; based on the target input demand torque, the vehicle launch is controlled, thereby solving the technical problem of requiring sufficiently large power generation power due to the need to reserve large torque for controlling the launch motor of the vehicle.

Claims

1. A launch control method for a vehicle, comprising: In response to a launch start signal of the vehicle, obtaining a lower limit value of a turbocharger speed of an engine of the vehicle; Determining an upper input speed limit value of a transmission of the vehicle and a lower input speed limit value of the transmission of the vehicle based on the turbocharger speed lower limit value; determining an input torque threshold of a transmission of the vehicle based on the input speed upper limit value and the input speed lower limit value; adjusting the original input demand torque of the transmission based on the input torque threshold to obtain a target input demand torque of the transmission; Based on the target input demand torque, the vehicle is controlled to launch.

2. The method according to claim 1, wherein: Determining an upper input speed limit of a transmission of the vehicle and a lower input speed limit of the transmission of the vehicle based on the turbocharger speed lower limit value includes: The turbocharger speed lower limit value and the engine speed reference value are summed to obtain the input speed upper limit value; The turbocharger speed lower limit value is determined as the input speed lower limit value.

3. The method according to claim 1, wherein: Determining an input torque threshold of a transmission of the vehicle based on the input speed upper limit value and the input speed lower limit value includes: In response to a transmission control unit of the vehicle receiving the input speed upper limit value, the input speed lower limit value and the launch start signal, the input torque threshold value is determined based on a heat dissipation power of the vehicle.

4. The method according to claim 1, wherein: Adjusting the original input demand torque of the transmission based on the input torque threshold to obtain the target input demand torque of the transmission includes: Determining the input required torque based on the gear ratio of the transmission; Determining a target torque based on the input torque threshold and the input demand torque, wherein the target torque is used to represent a minimum torque selected from the input torque threshold and the input demand torque by comparing the input torque threshold and the input demand torque; The original input demand torque is adjusted based on the target torque to obtain the target input demand torque.

5. The method according to claim 1, wherein: Based on the target input demand torque, controlling the vehicle to launch a vehicle includes: Based on the target input demand torque, the torque of the engine is distributed to obtain a target engine torque, and based on the target input demand torque, the torque of the motor of the vehicle is distributed to obtain a target motor torque; The vehicle launch is controlled based on the target engine torque and the target motor torque.

6. The method according to claim 5, wherein: Based on the target input demand torque, the torque of the engine is distributed to obtain a target engine torque, including: determining an external characteristic torque of the engine based on the target input demand torque and a rotation speed of the engine; Based on the external characteristic torque, the target engine torque is determined.

7. The method according to claim 5, wherein: Based on the target input demand torque, the torque of the motor of the vehicle is distributed to obtain the target motor torque, including: Obtaining the power of the high-voltage accessories of the vehicle and the charging capacity of the battery of the vehicle; determining a first torque of the motor based on the power and the charging capability; The target motor torque is determined based on the first torque and the target input demand torque.

8. A launch control device for a vehicle, comprising: a first response unit, configured to obtain a lower limit value of a turbocharger speed of an engine of the vehicle in response to a launch start signal of the vehicle; a first determining unit, configured to determine an upper input speed limit value of a transmission of the vehicle and a lower input speed limit value of the transmission of the vehicle based on the turbocharger speed lower limit value; a second determining unit, configured to determine an input torque threshold of a transmission of the vehicle based on the input speed upper limit value and the input speed lower limit value; an adjusting unit, configured to adjust an original input demand torque of the gearbox based on the input torque threshold to obtain a target input demand torque of the gearbox; A control unit is used to control the vehicle to launch based on the target input demand torque.

9. A computer-readable storage medium, wherein: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the launch control method for the vehicle according to any one of claims 1 to 7.

10. A vehicle, wherein: The vehicle is used to execute the launch control method for the vehicle according to any one of claims 1 to 7.

11. A computer program product, wherein: The invention comprises a computer program which, when executed by a processor, implements the method according to any one of claims 1 to 7.

12. A computer program product, wherein: The invention comprises a non-volatile computer-readable storage medium storing a computer program, wherein the computer program implements the method according to any one of claims 1 to 7 when executed by a processor.

13. A computer program, wherein: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

14. A computing device comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the method described in any one of claims 1 to 7 are implemented.

15. An electronic device, wherein: include: one or more processors; as well as A memory associated with the one or more processors, the memory being used to store program instructions, wherein the program instructions, when read and executed by the one or more processors, execute the steps of the method described in any one of claims 1 to 7.

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