Front-drive vehicle torque control method, device and vehicle

Abstract

The present application relates to the field of vehicle technology, and provides a front-wheel drive vehicle torque control method, device and vehicle. The front-wheel drive vehicle torque control method comprises: responding to a torque adjustment request, determining a reference speed of a power mechanism based on a rear wheel speed and a reference driving speed; calculating a ratio of an actual speed of the power mechanism to a reference speed; and reducing the output torque of the power mechanism when the ratio is greater than or equal to a preset threshold. The embodiment of the present application can reduce the output torque of the power mechanism to prevent the actual speed of the power mechanism from increasing rapidly, thereby alleviating the degree of front wheel slippage.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a front-wheel drive vehicle torque control method, device and vehicle. Background Art

[0002] When a front-wheel drive vehicle is driving, for example, when the vehicle is accelerating or braking to slow down and passes through a speed bump, the front wheel will slip briefly. Since the friction coefficient of the speed bump is smaller than that of the road surface, the adhesion of the front wheel will decrease when the front wheel of the vehicle passes over the speed bump. Moreover, when the vehicle is accelerating or braking to slow down, for example, the accelerator pedal is kept at a certain degree of opening, the front axle speed will increase rapidly due to the reduction in adhesion, resulting in the front wheel slipping. When the front wheel slips, the vehicle body will slide to a certain extent, resulting in instability of the vehicle body.

[0003] Although the vehicle is equipped with an ESP system (Electronic Stability Program), which can intervene to keep the vehicle body stable when the wheels slip, the ESP system will not intervene to keep the vehicle body stable during this time because the vehicle usually spends a short time on speed bumps. Summary of the invention

[0004] The present application provides a front-wheel drive vehicle torque control method, device and vehicle, which can reduce the front axle speed of the power mechanism and prevent the front axle speed from increasing rapidly, thereby alleviating the degree of slippage of the vehicle's front wheels.

[0005] In a first aspect, the present application provides a front-wheel drive vehicle torque control method, comprising: responding to a torque adjustment request, determining a reference speed of a power mechanism based on a rear wheel speed and a reference driving speed; wherein the torque adjustment request is generated based on a vehicle operating condition; calculating a ratio of an actual speed of the power mechanism to a reference speed; and when the ratio is greater than or equal to a preset threshold, reducing the output torque of the power mechanism.

[0006] When a front-wheel drive vehicle accelerates or brakes to decelerate through a speed bump, for example, the front wheel adhesion is reduced, causing the rotation speed of the power mechanism (such as a motor or engine) to increase significantly, and the front wheel will slip. In the embodiment of the present application, considering that the rear wheels of the front-wheel drive vehicle will not experience the above-mentioned slip, the reference rotation speed of the power mechanism at this time is determined by the rear wheel speed and the reference driving speed, thereby reflecting the normal rotation speed of the power mechanism. Afterwards, the ratio of the reference rotation speed to the actual rotation speed of the power mechanism is calculated. When the ratio is greater than or equal to a preset threshold, it indicates that the actual rotation speed of the power mechanism may have increased significantly due to the above-mentioned slip. At this time, the output torque of the power mechanism can be reduced to prevent the actual rotation speed of the power mechanism from increasing rapidly, thereby alleviating the degree of slippage of the front wheels.

[0007] In a possible implementation, the above-mentioned determination of the reference speed of the power mechanism based on the rear wheel speed and the reference driving speed includes: determining the vehicle speed offset corresponding to the reference driving speed and the vehicle operating condition through a preset data table; wherein the above-mentioned preset data table contains the correspondence between the reference driving speed, the vehicle operating condition and the vehicle speed offset; correcting the reference driving speed according to the vehicle speed offset; and determining the reference speed of the power mechanism according to the rear wheel speed and the corrected reference driving speed.

[0008] In a possible implementation, the vehicle operating condition includes an accelerator pedal opening, a steering wheel angle, a road slope, and a wheel speed difference, where the wheel speed difference is the difference between the rotation speed of the left front wheel and the rotation speed of the right front wheel. The above-mentioned determination of the vehicle speed offset corresponding to the reference driving speed and the vehicle operating condition through a preset data table includes: determining a first vehicle speed offset component corresponding to the accelerator pedal opening, a second vehicle speed offset component corresponding to the steering wheel angle, a third vehicle speed offset component corresponding to the road slope, and a fourth vehicle speed offset component corresponding to the wheel speed difference through a preset data table; and determining the vehicle speed offset based on the first vehicle speed offset component to the fourth vehicle speed offset component.

[0009] In a possible implementation, the above-mentioned correction of the reference driving speed according to the vehicle speed offset includes: correcting the reference driving speed based on v′=(1+a)·v, where a is the vehicle speed offset, v is the reference driving speed, and v′ is the corrected reference driving speed.

[0010] In a possible implementation, the above-mentioned determination of the reference speed of the power mechanism based on the rear wheel speed and the corrected reference driving speed includes: determining the corrected rear wheel speed based on the corrected reference driving speed and the rear wheel radius; determining the reference speed of the power mechanism based on the corrected rear wheel speed and a preset speed ratio; wherein the preset speed ratio characterizes the relationship between the rear wheel speed and the speed of the power mechanism.

[0011] In one possible implementation, the above-mentioned reduction of the output torque of the power mechanism includes: determining a torque weight coefficient based on the above-mentioned ratio; wherein the ratio is inversely proportional to the torque weight coefficient, and the torque weight coefficient is used to characterize the degree of adjustment of the output torque of the power mechanism; based on the torque weight coefficient, adjusting the output torque of the power mechanism.

[0012] In a possible implementation, before responding to the torque adjustment request, the method further includes: generating a torque adjustment request when the vehicle operating condition meets a preset condition. The vehicle operating condition may include one or more of the following: gear position, reference driving speed, accelerator pedal opening, steering wheel angle, road slope, and wheel speed difference between the rotation speed of the left front wheel and the rotation speed of the right front wheel. The vehicle operating condition meeting the preset condition includes one or more of the following: the gear position is a forward gear position, the reference driving speed is within a preset vehicle speed range, the accelerator pedal opening is within a preset opening area, the steering wheel angle is less than a preset angle threshold, the road slope is less than a preset slope threshold, and the wheel speed difference between the rotation speed of the left front wheel and the rotation speed of the right front wheel is less than a speed threshold.

[0013] In the second aspect, the present application provides a front-wheel drive vehicle torque control device, including: a determination module, used to respond to a torque adjustment request, and determine a reference speed of the power mechanism based on the rear wheel speed and a reference driving speed; wherein the above-mentioned torque adjustment request is generated based on the vehicle operating condition; a calculation module, used to calculate the ratio of the actual speed of the power mechanism to the reference speed; an output torque adjustment module, used to reduce the output torque of the power mechanism when the above-mentioned ratio is greater than or equal to a preset threshold.

[0014] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the processor implements the steps of the method described in the first aspect or any possible implementation of the first aspect.

[0015] In a fourth aspect, an embodiment of the present application provides a vehicle, which includes an electronic device, wherein the electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the steps of the method described in the first aspect or any possible implementation of the first aspect are implemented.

[0016] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect or any possible implementation method of the first aspect are implemented.

[0017] In a sixth aspect, an embodiment of the present application provides a computer program product, which has a program code. When the program code runs in a corresponding processor, controller, computing device or electronic device, the steps of the method described in the first aspect or any possible implementation of the first aspect are executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of an application scenario of the front-wheel drive vehicle torque control method provided in an embodiment of the present application;

[0020] Figure 2 is a schematic flow chart of a front-wheel drive vehicle torque control method provided in an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of a reference speed and an actual speed of a motor provided in an embodiment of the present application;

[0022] Figure 4 is a schematic structural diagram of a front-wheel drive vehicle torque control device provided in an embodiment of the present application;

[0023] Figure 5 It is a schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0026] Figure 1 The application scenario of the front-wheel drive vehicle torque control method provided by the embodiment of the present application is shown. Figure 1 In this application scenario, when a front-wheel drive vehicle is driving on the road, for example, when the front-wheel drive vehicle accelerates or brakes to decelerate through a speed bump, the reduced adhesion of the front wheels will cause the speed of the power mechanism (such as a motor or engine) to increase significantly, and the front wheels will slip.

[0027] The following is an example of a vehicle accelerating over a speed bump. When the vehicle accelerates (for example, the accelerator pedal is opened at 30%) and passes over a speed bump, the friction coefficient of the road surface is large, the vehicle's grip on the road surface is strong, and the front wheels of the vehicle usually do not slip. When the front wheels of the vehicle drive over the speed bump, because the friction coefficient of the speed bump is smaller than the friction coefficient of the road surface, the adhesion is reduced. If the motor output torque remains unchanged, the front wheel speed will soar rapidly, causing the front wheel to slip. In addition, when the front wheel speed increases rapidly, it may also cause abnormal noise from the front suspension of the vehicle.

[0028] In the embodiment of the present application, considering that the rear wheels of the front-wheel drive vehicle will not experience the above-mentioned slip phenomenon, the reference speed of the power mechanism at this time is determined by the rear wheel speed and the reference driving speed, thereby reflecting the normal speed of the power mechanism. Afterwards, the ratio of the reference speed to the actual speed of the power mechanism is calculated. When the ratio is greater than or equal to the preset threshold, it indicates that the actual speed of the power mechanism may be greatly increased due to the above-mentioned slip phenomenon. At this time, the output torque of the power mechanism can be reduced to prevent the actual speed of the power mechanism from increasing rapidly, thereby alleviating the degree of slippage of the front wheels.

[0029] The following combination Figure 1 Taking the front wheel slipping when the vehicle's front wheels accelerate or brake to decelerate through a speed bump as an example, the front-wheel torque control method provided in the embodiment of the present application is described in detail.

[0030] See also Figure 2 , which shows a flow chart of the implementation of the front-wheel drive vehicle torque control method provided by an embodiment of the present application, and is described in detail as follows:

[0031] Step 201 , in response to a torque adjustment request, determining a reference speed of a power mechanism based on a rear wheel speed and a reference driving speed.

[0032] In this step, the reference speed can be the speed of the power mechanism calculated by the vehicle controller, which is different from the actual speed of the power mechanism. The actual speed at this time will increase rapidly, while the reference speed can reflect the normal speed of the power mechanism when the front wheels are not slipping. The vehicle controller can be an HCU (Hybrid Control Unit) or other controllers, which are not limited in the embodiments of the present application.

[0033] The rear wheel speed can be obtained by a wheel speed sensor disposed on the rear wheel. Since the rear wheels include a left rear wheel and a right rear wheel, the rotation speed of the left rear wheel and the rotation speed of the right rear wheel can be averaged to balance the difference in wheel speeds of the two rear wheels to more accurately determine the rear wheel speed. The rear wheel radius is a preset value and will not be described in detail.

[0034] In some embodiments, the above-mentioned determination of the reference speed of the power mechanism based on the rear wheel speed and the reference driving speed may include: determining the vehicle speed offset corresponding to the reference driving speed and the vehicle operating condition through a preset data table; wherein the preset data table contains the correspondence between the reference driving speed, the vehicle operating condition and the vehicle speed offset; correcting the reference driving speed according to the vehicle speed offset; and determining the reference speed of the power mechanism according to the rear wheel speed and the corrected reference driving speed.

[0035] Exemplarily, the reference driving speed may be determined by the ESP system and sent to the vehicle controller. For example, the ESP system may determine the reference driving speed of the vehicle by multiplying the rear wheel speed and the rear wheel radius. Specifically, the reference driving speed may be determined by v=nπr, where v is the reference driving speed, n is the rear wheel speed, and r is the rear wheel radius.

[0036] In addition, the reference driving speed may also be determined by the vehicle controller through the product of the rear wheel speed and the rear wheel radius.

[0037] Exemplarily, the vehicle operating condition may include an accelerator pedal opening, a steering wheel angle, a road slope, and a wheel speed difference, where the wheel speed difference is the difference between the rotation speed of the left front wheel and the rotation speed of the right front wheel. Correspondingly, the above-mentioned determination of the vehicle speed offset corresponding to the reference driving speed and the vehicle operating condition through a preset data table may include: determining a first vehicle speed offset component corresponding to the accelerator pedal opening, a second vehicle speed offset component corresponding to the steering wheel angle, a third vehicle speed offset component corresponding to the road slope, and a fourth vehicle speed offset component corresponding to the wheel speed difference through a preset data table; and determining the vehicle speed offset based on the first vehicle speed offset component to the fourth vehicle speed offset component.

[0038] For example, the first vehicle speed offset component, the second vehicle speed offset component, the third vehicle speed offset component and the fourth vehicle speed offset component may be added to obtain the vehicle speed offset, wherein the first vehicle speed offset component, the second vehicle speed offset component, the third vehicle speed offset component and the fourth vehicle speed offset component are all positive numbers less than 1, and the calculated vehicle speed offset is within the range of (0,1).

[0039] Exemplarily, the above-mentioned correction of the reference driving speed according to the vehicle speed offset may include: correcting the reference driving speed based on v′=(1+a)·v, where a is the vehicle speed offset, v is the reference driving speed, and v′ is the corrected reference driving speed.

[0040] Exemplarily, the above-mentioned determination of the reference speed of the power mechanism based on the rear wheel speed and the corrected reference driving speed includes: determining the corrected rear wheel speed based on the corrected reference driving speed and the rear wheel radius; determining the reference speed of the power mechanism based on the corrected rear wheel speed and a preset speed ratio; wherein the preset speed ratio characterizes the relationship between the rear wheel speed and the speed of the power mechanism.

[0041] like Figure 3 As shown in the figure, under normal working conditions, the actual motor speed is less than the upper limit of the motor reference speed and greater than the lower limit of the motor reference speed. Under speed bump conditions, the actual motor speed increases rapidly and exceeds the upper limit of the motor reference speed, causing the front wheel to slip.

[0042] Specifically, the product of the corrected reference driving speed and the rear wheel radius can be calculated to determine the corrected rear wheel speed n′=v′ / πr. Afterwards, the reference speed of the power mechanism can be determined based on the corrected rear wheel speed n′ and the preset speed ratio. The preset speed ratio can be specifically the ratio between the rear wheel speed and the speed of the power mechanism. For example, if the preset speed ratio is b, the reference speed of the power mechanism can be n′ / b.

[0043] In some embodiments, before step 201, the method may further include: generating a torque adjustment request when the vehicle operating condition meets a preset condition. The vehicle operating condition may include one or more of the following: gear position, reference driving speed, accelerator pedal opening, steering wheel angle, road slope, and wheel speed difference between the rotation speed of the left front wheel and the rotation speed of the right front wheel. The vehicle operating condition meeting the preset condition may include one or more of the following: the gear position is a forward gear position, the reference driving speed is within a preset vehicle speed range, the accelerator pedal opening is within a preset opening range, the steering wheel angle is less than a preset angle threshold, the road slope is less than a preset slope threshold, and the wheel speed difference between the rotation speed of the left front wheel and the rotation speed of the right front wheel is less than a speed threshold.

[0044] Exemplarily, when the vehicle operating condition meets the above preset conditions, a torque adjustment request is generated, the torque adjustment flag is activated, and then steps 201 to 203 are executed, and the output torque is adjusted when it is determined that the front wheels of the vehicle are slipping. If the vehicle operating condition does not meet the above preset conditions, no torque adjustment request is generated, the torque adjustment flag is not activated, and steps 201 to 203 are not executed accordingly.

[0045] It should be noted that the embodiments of the present application do not specifically limit the above-mentioned preset vehicle speed range, preset opening range, preset turning angle threshold, preset slope threshold and speed threshold. Those skilled in the art can set them according to actual needs, which are all within the protection scope of the present application.

[0046] Step 202, calculating the ratio of the actual speed of the power mechanism to the reference speed.

[0047] The above ratio is used to characterize the relationship between the actual speed of the power mechanism and the reference speed. The larger the above ratio is, the more the actual speed of the power mechanism deviates from the normal speed when the front wheel is not slipping. The closer the above ratio is to 1, the closer the actual speed of the power mechanism is to the normal speed when the front wheel is not slipping. Therefore, by calculating the above ratio, it is possible to determine whether the actual speed of the power mechanism deviates from the normal speed and the degree of deviation from the normal speed, thereby determining whether the output torque of the power mechanism needs to be controlled to alleviate the degree of front wheel slippage.

[0048] Step 203: When the above ratio is greater than or equal to a preset threshold, the output torque of the power mechanism is reduced.

[0049] The above-mentioned preset threshold value can be calibrated based on experimental data. If the above-mentioned ratio is greater than or equal to the above-mentioned preset threshold value, it means that the output torque of the power mechanism is too large at this time, and the output torque of the power mechanism needs to be reduced to suppress the rapid increase of the front wheel speed and alleviate the degree of front wheel slip. If the above-mentioned ratio is less than the above-mentioned preset threshold value, it means that the output torque of the power mechanism is large at this time, but it has little effect on the driving of the vehicle, and the output torque of the power mechanism may not be adjusted.

[0050] Exemplarily, the above-mentioned reduction of the output torque of the power mechanism may specifically include: determining a torque weight coefficient based on the above-mentioned ratio; wherein the ratio is inversely proportional to the torque weight coefficient, and the torque weight coefficient is used to characterize the degree of adjustment of the output torque of the power mechanism; based on the torque weight coefficient, adjusting the output torque of the power mechanism.

[0051] As an example, the torque weight coefficient can be a value in the range of (0,1). The torque weight coefficient is multiplied by the output torque of the power mechanism to calculate the adjusted output torque, and then the output torque of the power mechanism is adjusted according to the calculated output torque, thereby reducing the output torque of the power mechanism to prevent the actual speed of the power mechanism from increasing rapidly and to alleviate the degree of front wheel slip.

[0052] In some embodiments, the torque weight coefficient corresponding to the above ratio can be determined based on a preset data table, in which the corresponding relationship between the ratio and the torque weight coefficient is stored. The larger the ratio, the smaller the corresponding torque weight coefficient.

[0053] For example, the ratio and the torque weight coefficient may be reciprocals of each other, and the torque weight coefficient may be used to adjust the output torque of the power mechanism to the output torque of the power mechanism when the front wheels of the vehicle do not slip.

[0054] For another example, the inverse of the ratio may be smaller than the torque weight coefficient, through which the output torque of the power mechanism can be brought closer to the output torque of the power mechanism when the front wheels of the vehicle do not slip.

[0055] The above preset ratio can be determined based on experiments and will not be described in detail here.

[0056] The above-mentioned front-wheel drive vehicle torque control method takes into account that the rear wheels of the front-wheel drive vehicle will not experience the above-mentioned slip phenomenon. Therefore, the reference speed of the power mechanism at this time is determined by the rear wheel speed and the reference driving speed, thereby reflecting the normal speed of the power mechanism. Afterwards, the ratio of the reference speed to the actual speed of the power mechanism is calculated. When the ratio is greater than or equal to the preset threshold, it indicates that the actual speed of the power mechanism may be greatly increased due to the above-mentioned slip phenomenon. At this time, the output torque of the power mechanism can be reduced to prevent the actual speed of the power mechanism from increasing rapidly, thereby alleviating the degree of slippage of the front wheels.

[0057] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0058] The following is an embodiment of the device of the present application. For details not described in detail, please refer to the corresponding method embodiment described above.

[0059] Figure 4 The schematic diagram of the structure of the torque control device for a front-wheel drive vehicle provided in an embodiment of the present application is shown. For the convenience of explanation, only the part related to the embodiment of the present application is shown, which is described in detail as follows:

[0060] like Figure 4 As shown, the front-wheel drive vehicle torque control device 400 may include a reference speed determination module 401 , a ratio calculation module 402 and an output torque adjustment module 403 .

[0061] The reference speed determination module 401 is used to respond to the torque adjustment request and determine the reference speed of the power mechanism based on the rear wheel speed and the reference driving speed. The torque adjustment request is generated based on the vehicle operating conditions. The ratio calculation module 402 is used to calculate the ratio of the actual speed of the power mechanism to the reference speed. The output torque adjustment module 403 is used to reduce the output torque of the power mechanism when the ratio is greater than or equal to a preset threshold.

[0062] In one possible implementation, the reference speed determination module 401 may include: a vehicle speed offset determination unit, used to determine the vehicle speed offset corresponding to the reference driving speed and the vehicle operating condition through a preset data table; wherein the preset data table contains the correspondence between the reference driving speed, the vehicle operating condition and the vehicle speed offset; a correction unit, used to correct the reference driving speed according to the vehicle speed offset; and a reference speed determination unit, used to determine the reference speed of the power mechanism according to the rear wheel speed and the corrected reference driving speed.

[0063] In some embodiments, the vehicle operating conditions may include an accelerator pedal opening, a steering wheel angle, a road slope, and a wheel speed difference, where the wheel speed difference is the difference between the rotation speed of the left front wheel and the rotation speed of the right front wheel. The vehicle speed offset determination unit may be specifically used to: determine a first vehicle speed offset component corresponding to the accelerator pedal opening, a second vehicle speed offset component corresponding to the steering wheel angle, a third vehicle speed offset component corresponding to the road slope, and a fourth vehicle speed offset component corresponding to the wheel speed difference through a preset data table; and determine the vehicle speed offset based on the first vehicle speed offset component to the fourth vehicle speed offset component.

[0064] In some embodiments, the correction unit may be specifically used to correct the reference driving speed based on v′=(1+a)·v, where a is the vehicle speed offset, v is the reference driving speed, and v′ is the corrected reference driving speed.

[0065] In some embodiments, the reference speed determination unit can be specifically used to: determine a corrected rear wheel speed based on a corrected reference driving speed and a rear wheel radius; determine a reference speed of the power mechanism based on the corrected rear wheel speed and a preset speed ratio; wherein the preset speed ratio characterizes the relationship between the rear wheel speed and the speed of the power mechanism.

[0066] In one possible implementation, the output torque adjustment module 403 can be specifically used to: determine the torque weight coefficient based on the above ratio; wherein the above ratio is inversely proportional to the torque weight coefficient, and the torque weight coefficient is used to characterize the degree of adjustment of the output torque of the power mechanism; based on the torque weight coefficient, adjust the output torque of the power mechanism.

[0067] In a possible implementation, the front-wheel drive vehicle torque control device 400 may further include: a torque adjustment request generation module, which is used to generate a torque adjustment request when the vehicle operating condition meets the preset conditions. The vehicle operating condition may include one or more of the following: gear position, reference driving speed, accelerator pedal opening, steering wheel angle, road slope, and the wheel speed difference between the left front wheel speed and the right front wheel speed. The vehicle operating condition meeting the preset conditions includes one or more of the following: the gear position is a forward gear position, the reference driving speed is in a preset vehicle speed range, the accelerator pedal opening is in a preset opening area, the steering wheel angle is less than a preset angle threshold, the road slope is less than a preset slope threshold, and the wheel speed difference between the left front wheel speed and the right front wheel speed is less than a speed threshold.

[0068] The embodiment of the present application provides a vehicle, including an electronic device, the electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in any of the above-mentioned front-drive vehicle torque control method embodiments are implemented, such as Figure 2Steps 201 to 203 are shown.

[0069] The present application also provides a computer program product having a program code, which executes the steps of any of the above-mentioned front-drive vehicle torque control method embodiments when the program code is run in a corresponding processor, controller, computing device or terminal, such as Figure 2 Steps 201 to 203 are shown.

[0070] Those skilled in the art will appreciate that the method and the equipment proposed in the embodiment of the present application can be implemented in various forms of hardware, software, firmware, a dedicated processor or a combination thereof. The dedicated processor may include an application specific integrated circuit (ASIC), a reduced instruction set computer (RISC) and / or a field programmable gate array (FPGA). The proposed method and device are preferably implemented as a combination of hardware and software. The software is preferably installed on a program storage device as an application. It is typically based on a machine with a computer platform having hardware, such as one or more central processing units (CPUs), random access memories (RAMs) and one or more input / output (I / O) interfaces. An operating system is also typically installed on the computer platform. The various processes and functions described here may be part of an application, or a part thereof may be executed by an operating system.

[0071] Figure 5 Schematic diagram of an electronic device provided in an embodiment of the present application. Figure 5 As shown, the electronic device 500 of this embodiment includes: a processor 501, a memory 502, and a computer program 503 stored in the memory 502 and executable on the processor 501. When the processor 501 executes the computer program 503, the steps in the above-mentioned front-drive vehicle torque control method embodiments are implemented, such as Figure 2 Alternatively, when the processor 501 executes the computer program 503, the functions of each module / unit in the above-mentioned device embodiments are realized, for example Figure 4 Functionality of modules / units 401 to 403 shown.

[0072] Exemplarily, the computer program 503 may be divided into one or more modules / units, which are stored in the memory 502 and executed by the processor 501 to complete / implement the solution provided by the present application. The one or more modules / units may be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program 503 in the electronic device 500. For example, the computer program 503 may be divided into Figure 4 Modules / units 401 to 403 are shown.

[0073] The electronic device 500 may be a vehicle controller, a mobile phone, a notebook, a PDA, a cloud server or other computing device. The electronic device 500 may include, but is not limited to, a processor 501 and a memory 502. Those skilled in the art will appreciate that Figure 5 It is only an example of the electronic device 500 and does not constitute a limitation of the electronic device 500. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device 500 may also include input and output devices, network access devices, buses, etc.

[0074] The processor 501 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0075] The memory 502 may be an internal storage unit of the electronic device 500, such as a hard disk or memory of the electronic device 500. The memory 502 may also be an external storage device of the electronic device 500, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 500. Further, the memory 502 may also include both an internal storage unit of the electronic device 500 and an external storage device. The memory 502 is used to store the computer program and other programs and data required by the electronic device. The memory 502 may also be used to temporarily store data that has been output or is to be output.

[0076] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0077] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0078] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0079] In the embodiments provided in the present application, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, 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 devices or units, which can be electrical, mechanical or other forms.

[0080] 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 network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0081] In addition, each functional unit in each embodiment of the present application 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.

[0082] If the integrated module / 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 present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned vehicle air conditioning control method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0083] In addition, the embodiments shown in the drawings of the present application or the features of the various embodiments mentioned in this specification are not necessarily understood as independent embodiments. Instead, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the drawings.

[0084] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A torque control method for a front-wheel drive vehicle, characterized in that: include: In response to a torque adjustment request, determining a reference speed of the power mechanism based on a rear wheel speed and a reference driving speed; wherein the torque adjustment request is generated based on a vehicle operating condition; and the reference driving speed is determined by multiplying the rear wheel speed by a rear wheel radius; Calculating a ratio of an actual rotational speed of the power mechanism to the reference rotational speed; When the ratio is greater than or equal to a preset threshold, reducing the output torque of the power mechanism; The step of determining a reference speed of the power mechanism based on the rear wheel speed and the reference driving speed includes: Determining a vehicle speed offset corresponding to the reference driving speed and the vehicle operating condition through a preset data table; wherein the preset data table contains a corresponding relationship between the reference driving speed, the vehicle operating condition and the vehicle speed offset; Correcting the reference driving speed according to the vehicle speed offset; The reference speed of the power mechanism is determined according to the rear wheel speed and the corrected reference driving speed.

2. The front-wheel drive vehicle torque control method according to claim 1, characterized in that: The vehicle operating conditions include the accelerator pedal opening, the steering wheel angle, the road slope and the wheel speed difference, wherein the wheel speed difference is the difference between the rotation speed of the left front wheel and the rotation speed of the right front wheel; The determining of the vehicle speed offset corresponding to the reference driving speed and the vehicle operating condition by using a preset data table includes: Determining, by a preset data table, a first vehicle speed offset component corresponding to the accelerator pedal opening, a second vehicle speed offset component corresponding to the steering wheel angle, a third vehicle speed offset component corresponding to the road slope, and a fourth vehicle speed offset component corresponding to the wheel speed difference; The vehicle speed offset amount is determined based on the first to fourth vehicle speed offset components.

3. The front-wheel drive vehicle torque control method according to claim 1, characterized in that: The step of correcting the reference driving speed according to the vehicle speed offset includes: The reference driving speed is corrected based on v′=(1+a)·v, where a is the vehicle speed offset, v is the reference driving speed, and v′ is the corrected reference driving speed.

4. The front-wheel drive vehicle torque control method according to claim 1, characterized in that: Determining the reference speed of the power mechanism according to the rear wheel speed and the corrected reference driving speed includes: determining a corrected rear wheel speed according to the corrected reference driving speed and the rear wheel radius; The reference speed of the power mechanism is determined according to the corrected rear wheel speed and a preset speed ratio, wherein the preset speed ratio represents the relationship between the rear wheel speed and the speed of the power mechanism.

5. The front-wheel drive vehicle torque control method according to claim 1, characterized in that: The reducing the output torque of the power mechanism comprises: Determining a torque weight coefficient based on the ratio; wherein the ratio is inversely proportional to the torque weight coefficient, and the torque weight coefficient is used to characterize the degree of adjusting the output torque of the power mechanism; Based on the torque weight coefficient, the output torque of the power mechanism is adjusted.

6. The front-wheel drive vehicle torque control method according to claim 1, characterized in that: Before responding to the torque adjustment request, the method further includes: When the vehicle operating condition meets a preset condition, generating the torque adjustment request; Among them, the vehicle operating condition satisfies the preset conditions including one or more of the following: the gear is the forward gear, the reference driving speed is within the preset vehicle speed range, the accelerator pedal opening is within the preset opening area, the steering wheel angle is less than the preset angle threshold, the road slope is less than the preset slope threshold, and the wheel speed difference between the left front wheel speed and the right front wheel speed is less than the speed threshold.

7. A torque control device for a front-wheel drive vehicle, characterized in that: include: a reference speed determination module, configured to determine a reference speed of the power mechanism based on a rear wheel speed and a reference driving speed in response to a torque adjustment request; wherein the torque adjustment request is generated based on a vehicle operating condition; and the reference driving speed is determined by multiplying the rear wheel speed by a rear wheel radius; A ratio calculation module, used to calculate the ratio of the actual rotation speed of the power mechanism to the reference rotation speed; an output torque adjustment module, configured to reduce the output torque of the power mechanism when the ratio is greater than or equal to a preset threshold; The reference speed determination module comprises: A vehicle speed offset determination unit, configured to determine a vehicle speed offset corresponding to the reference driving speed and the vehicle operating condition through a preset data table; wherein the preset data table contains a correspondence between the reference driving speed, the vehicle operating condition and the vehicle speed offset; a correction unit, configured to correct the reference driving speed according to the vehicle speed offset; The reference speed determination unit is used to determine the reference speed of the power mechanism according to the rear wheel speed and the corrected reference driving speed.

8. A vehicle, comprising an electronic device, the electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the front-wheel drive vehicle torque control method as described in any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the front-wheel drive vehicle torque control method as described in any one of claims 1 to 6 are implemented.

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