阅读说明：本技术 车辆及其控制方法、控制装置、车载设备、介质 (Vehicle, vehicle control method, vehicle control device, vehicle-mounted device, and medium ) 是由 刘泽 李海邈 张洪超 肖柏宏 原达 于 2021-10-25 设计创作，主要内容包括：本发明涉及车辆技术领域,具体涉及一种车辆的控制方法及系统、车辆、控制装置、车载设备、计算机可读存储介质。本发明旨在解决“由于在增加发动机扭矩时并未对转向不足和转向过度的工况进行区分,因此制定出的发动机扭矩的增加策略尚存在提升空间”的技术问题。为此目的,本发明提供了一种车辆的控制方法及系统、车辆、控制装置、车载设备、计算机可读存储介质,其中的控制方法包括：在处于转向工况的车辆出现异常状态的情形下,判断当前的异常状态为转向不足还是转向过度；根据判断结果,依据针对当前的异常状态预先制定的扭矩量的调节机制调节车辆的扭矩。通过这样的设置,能够谋求针对转向不足和转向过度两种工况给出可行的扭矩调节策略。(The invention relates to the technical field of vehicles, in particular to a vehicle control method and system, a vehicle, a control device, vehicle-mounted equipment and a computer-readable storage medium. The invention aims to solve the technical problem that a formulated engine torque increasing strategy has a lifting space because the working conditions of understeer and oversteer are not distinguished when the engine torque is increased. To this end, the invention provides a control method and a control system of a vehicle, the vehicle, a control device, vehicle-mounted equipment and a computer readable storage medium, wherein the control method comprises the following steps: under the condition that the vehicle in the steering working condition is in an abnormal state, judging whether the current abnormal state is under steering or over steering; and according to the judgment result, regulating the torque of the vehicle according to a preset torque amount regulation mechanism aiming at the current abnormal state. Through the arrangement, a feasible torque adjusting strategy can be provided for the two working conditions of understeer and oversteer.)

1. A control method of a vehicle, characterized by comprising:

under the condition that the vehicle in the steering working condition is in an abnormal state, judging whether the current abnormal state is under steering or over steering;

and according to the judgment result, regulating the torque of the vehicle according to a preset torque amount regulation mechanism aiming at the current abnormal state.

2. The control method according to claim 1, wherein the "adjusting the torque of the vehicle according to the adjustment mechanism of the amount of torque that is predetermined for the current abnormal state according to the determination result" includes:

when the vehicle is under steering, adjusting the torque of the vehicle according to the first mapping relation;

when the vehicle is in oversteer, adjusting the torque of the vehicle according to the second mapping relation;

wherein the first mapping relationship and the second mapping relationship differ at least in respect of the parameters involved.

3. The control method according to claim 2, wherein the parameter involved in the first mapping relationship includes a first parameter that is a quantity related to a steering wheel angle.

4. The control method according to claim 3, wherein the first parameter is a first difference between an actual steering wheel angle corresponding to a current time and a steady-state steering wheel angle.

5. The control method according to any one of claims 2 to 4, characterized in that the parameter involved in the second mapping relationship includes a second parameter that is a quantity related to a yaw rate of the vehicle.

6. The control method according to claim 5, characterized in that the second parameter is a second difference value between the ideal yaw rate and the actual yaw rate corresponding to the current time instant.

7. A control system of a vehicle, characterized by comprising:

a determination module configured to: under the condition that the vehicle under the steering working condition is abnormal, judging whether the current abnormal state is under steering or over steering; and

a conditioning module configured to: and according to the judgment result, regulating the torque of the vehicle according to a preset torque amount regulation mechanism aiming at the current abnormal state.

8. The control system of claim 7, wherein the adjustment module is further configured to:

when the vehicle is under steering, adjusting the torque of the vehicle according to the first mapping relation;

when the vehicle is in oversteer, adjusting the torque of the vehicle according to the second mapping relation;

wherein the first mapping relationship and the second mapping relationship differ at least in respect of the parameters involved.

9. The control system according to claim 8, wherein the parameter involved in the first mapping relationship includes a first parameter that is a quantity related to a steering wheel angle.

10. The control system of claim 9, wherein the first parameter is a first difference between an actual steering wheel angle corresponding to a current time and a steady state steering wheel angle.

Technical Field

The invention relates to the technical field of vehicles, in particular to a vehicle control method and system, a vehicle, a control device, vehicle-mounted equipment and a computer-readable storage medium.

Background

Vehicles typically include varying degrees of cornering during driving. Situations in which the vehicle is not turning precisely often occur when the vehicle is in a cornering situation, such as situations that typically include both under-cornering and over-cornering. If the correction is not carried out, the driving performance of the vehicle is influenced, and at least safety and smoothness are reflected to a certain extent.

For example, the chinese invention patent (CN102248936B) discloses a method for controlling a vehicle and a vehicle, and specifically discloses the following: the problem of understeer is overcome based on the "known application of brake torque to the inner wheels and the problem of oversteer is overcome by applying brake torque to the outer wheels. Such application of the brake results in a loss of longitudinal driving force of the vehicle. To overcome this loss of longitudinal performance, it is known to increase engine torque to compensate for the loss of longitudinal drive force. However, internal combustion engines can experience a time delay in providing the required torque, thereby adversely affecting the overall performance of the vehicle. Inaccurate torque control and delay of the internal combustion engine can interfere with or render ineffective normal vehicle stability events by applying braking torque to the outside wheels of the vehicle when oversteer is detected during cornering; a method of increasing electrical energy provided to an electric motor coupled to a first axle of the vehicle in response to applying the braking torque, wherein the electrical energy provided to the electric motor compensates for the braking torque.

It can be seen that this document compensates for the applied braking torque by increasing the engine torque directly by increasing the electrical energy of the electric motor of the axle in response to the application of the braking torque. The increase in the engine torque is achieved by a map of the braking torque and the electric power of the electric motor, on the premise that the increasing tendency of the engine torque is known. Because the working conditions of understeer and oversteer are not distinguished when the engine torque is increased, the formulated engine torque increasing strategy still has a space for improving.

Disclosure of Invention

Technical problem

The present invention is proposed to solve at least part of the above-mentioned problem of the prior art that the "strategy for increasing the engine torque still has a lift space", or at least to some extent.

Technical scheme

In view of this, a first aspect of the present invention provides a control method of a vehicle, the control method including: under the condition that the vehicle under the steering working condition is abnormal, judging whether the current abnormal state is under steering or over steering; and according to the judgment result, regulating the torque of the vehicle according to a preset torque amount regulation mechanism aiming at the current abnormal state.

Through the arrangement, a feasible torque adjusting strategy can be provided for the two working conditions of understeer and oversteer.

Specifically, the torque regulation strategy according to which the torque is increased is obtained on the premise that understeer and oversteer are firstly distinguished, so that the regulation strategy can better correct the torque for two abnormal states, and thus effectively avoid the loss of the longitudinal driving force of the vehicle caused by the increase of the braking torque.

It is understood that, in the case that two abnormal states are distinguished, different torque adjustment strategies may be formulated for the respective abnormal states, and parameters, calculation manners and the like according to the strategies may be the same or different. For example, parameters 1 and 2 are used to give specific torque increase for both abnormal states, but after parameters 1 and 2 are obtained, the specific torque increase is obtained according to different calculation manners; and the like.

With regard to the control method described above, in one possible embodiment, the "adjusting the torque of the vehicle according to the adjustment mechanism of the amount of torque predetermined for the current abnormal state according to the determination result" includes: when the vehicle is under steering, adjusting the torque of the vehicle according to the first mapping relation; when the vehicle is in oversteer, adjusting the torque of the vehicle according to the second mapping relation; wherein the first mapping relationship and the second mapping relationship differ at least in respect of the parameters involved.

By this arrangement, a particular form of adjustment mechanism for the amount of torque corresponding to understeer and oversteer is given.

It should be noted that the parameters may be expressed as differences in number, category, and the like. On the premise of being able to better distinguish the adjustment mechanism of the torque amount for the two abnormal states, those skilled in the art can flexibly select the specific forms of the two mapping relationships according to actual requirements. For example, the two mappings are different in the number of parameters involved, the first mapping may be described as a correspondence between an available parameter 1 and the amount of torque to be increased, and the second mapping may be described as a correspondence between an available parameter (parameter 1, parameter 2) and the amount of torque to be increased; and the like.

It is understood that, a person skilled in the art may determine the specific forms of the first mapping relationship and the second mapping relationship according to actual conditions, as long as the torque amount determined according to the corresponding parameters can suppress or completely eliminate the current abnormal state, for example, the specific forms may include, but are not limited to, a calculation formula (simple), a model (complex), a lookup table (e.g., based on calibration), and the like.

With regard to the control method described above, in one possible embodiment, the parameter involved in the first mapping relationship includes a first parameter, and the first parameter is a quantity related to a steering wheel angle.

By such an arrangement, a specific form of the parameter involved in the first mapping relation is given.

The steering angle-related quantity referred to herein may be a steering angle (actual measurement value) directly obtained, a value obtained by subjecting the actual measurement value to a certain mathematical process (for example, an absolute value, a square value, or the like), or a value obtained by subjecting the actual measurement value to a certain physical process (for example, introducing another parameter, performing a certain operation on the actual measurement steering angle and the parameter, and regarding an intermediate value as a result of the operation as a steering angle-related quantity); and the like.

It is to be understood that the parameter involved in the first mapping relationship may include only one parameter related to the steering wheel angle, or may include other parameters besides the one parameter, and those skilled in the art can flexibly select the parameter according to the actual situation on the premise that the first mapping relationship can embody the torque amount that should be increased in the understeer state.

With regard to the above control method, in one possible embodiment, the first parameter is a first difference between an actual steering wheel angle corresponding to the current time and a steady-state steering wheel angle.

By such an arrangement, a specific form of the first parameter is given.

The reason why the amount of torque in the understeer condition is adjusted by using the difference in the steering wheel angle is as follows: on the one hand, the difference of the steering wheel angles can visually represent the deviation degree of the understeer state relative to the steady-state steering state at the current moment. On the other hand, when the driver is in the abnormal state of the steering shortage, the change of the steering wheel angle can intuitively represent the operation intention of the driver. Specifically, a small variation in the steering wheel angle indicates that the driver can comfortably cope with the abnormal state of the side behavior, whereas a large variation in the steering wheel angle indicates that there is a certain difficulty in coping with the abnormal state of the side behavior, such as a state in which the driver's normal operation in coping with the abnormal state may cause understeer, which tends to be serious.

With the control method described above, in one possible embodiment, the parameter involved in the second mapping relationship includes a second parameter that is a quantity related to a yaw rate of the vehicle.

By such an arrangement, a specific form of the parameter involved in the second mapping relationship is given.

Similar to the first mapping relationship, the number and the type of the parameters related to the second mapping relationship, the specific form of the second parameter, and the like can be flexibly determined by those skilled in the art according to actual requirements.

With the above control method, in one possible embodiment, the second parameter is a second difference between the ideal yaw rate and the actual yaw rate corresponding to the current time.

By such an arrangement, a specific form of the second parameter is given.

The reason why the amount of torque in the case of understeer is adjusted using the difference in yaw rate of the vehicle is as follows: the vehicle may be described as a relatively unstable state when oversteered as compared to understeer, when the difference in yaw rate is the first control target of the vehicle. Therefore, in such an abnormal state, the state of change in the difference in the yaw rate can be used to more intuitively characterize the oversteer condition of the vehicle, and is also more suitable for characterizing the oversteer condition of the vehicle.

A second aspect of the invention provides a control system of a vehicle corresponding to the foregoing control method of a vehicle, the control system including: a determination module configured to: under the condition that the vehicle under the steering working condition is abnormal, judging whether the current abnormal state is under steering or over steering; and a conditioning module configured to: and according to the judgment result, regulating the torque of the vehicle according to a preset torque amount regulation mechanism aiming at the current abnormal state.

With respect to the above control system, in one possible embodiment, the adjustment module is further configured to: when the vehicle is under steering, adjusting the torque of the vehicle according to the first mapping relation; when the vehicle is in oversteer, adjusting the torque of the vehicle according to the second mapping relation; wherein the first mapping relationship and the second mapping relationship differ at least in respect of the parameters involved.

With the above control system, in one possible embodiment, the parameter involved in the first mapping relationship includes a first parameter, and the first parameter is a quantity related to a steering wheel angle.

With the above control system, in one possible embodiment, the first parameter is a first difference between an actual steering wheel angle corresponding to the current time and a steady-state steering wheel angle.

With the control system described above, in one possible embodiment, the parameter involved in the second mapping relationship includes a second parameter that is a quantity related to a yaw rate of the vehicle.

With the above control system, in one possible embodiment, the second parameter is a second difference between the ideal yaw rate and the actual yaw rate corresponding to the current time.

It can be understood that the control system of the vehicle has all the technical effects of any one of the control methods of the vehicle, and the details are not repeated herein.

In the description of the present invention, a "control module" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The processor may be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and/or signal processing functionality. The processor may be implemented in software, hardware, or a combination thereof. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and the like.

Further, it should be understood that, since the setting of the control module is only for explaining the functional units in the system corresponding to the control method of the vehicle of the present invention, the physical device corresponding to the control module may be the processor itself, or a part of software in the processor, a part of hardware, or a part of a combination of software and hardware. Thus, the number of control modules is only exemplary. Those skilled in the art will appreciate that the control module may be adaptively split according to the actual situation. The specific splitting of the control module does not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solution after splitting will fall into the protection scope of the present invention.

A third aspect of the invention provides a computer readable storage medium adapted to store a plurality of program codes adapted to be loaded and run by a processor to perform a control method of a vehicle according to any one of the preceding claims.

It is understood that the computer-readable storage medium has all the technical effects of any one of the control methods of the vehicle described in the foregoing, and will not be described herein again.

It will be understood by those skilled in the art that all or part of the processes of the control method of the vehicle implemented by the present invention can be implemented by the relevant hardware instructed by a computer program, which can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above-described method embodiments can be implemented. Wherein the computer program comprises computer program code, it is understood that the program code comprises, but is not limited to, program code for performing the above-mentioned control method of the vehicle. For convenience of explanation, only portions relevant to the present invention are shown. The computer program code may be in source code form, object code form, an executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device capable of carrying said computer program code, media, usb disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunication signals, software distribution media, etc. It should be noted that the computer readable storage medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable storage media that does not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.

A fourth aspect of the invention provides a control apparatus comprising a memory and a processor, the memory being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform a control method of a vehicle as claimed in any one of the preceding claims.

It is understood that the control device has all the technical effects of the control method of the vehicle described in any one of the foregoing, and the details are not repeated herein. The control device may be a control device apparatus formed including various electronic apparatuses.

A fifth aspect of the invention provides an in-vehicle apparatus including the aforementioned control device.

It is understood that the vehicle-mounted device has all the technical effects of the control method of the vehicle described in any one of the foregoing embodiments, and the details are not repeated herein. The vehicle-mounted device may be a device additionally configured for the vehicle, may be an existing configuration device for the vehicle, or may be a device obtained by performing a certain change on an existing configuration device.

A sixth aspect of the invention provides a vehicle that includes the aforementioned control apparatus; or the vehicle includes the aforementioned in-vehicle device.

It is understood that the vehicle has all the technical effects of the control method of the vehicle described in any one of the foregoing, and the details are not repeated herein.

A control method of a vehicle, characterized by comprising:

under the condition that the vehicle in the steering working condition is in an abnormal state, judging whether the current abnormal state is under steering or over steering;

and according to the judgment result, regulating the torque of the vehicle according to a preset torque amount regulation mechanism aiming at the current abnormal state.

The control method according to claim 1, wherein the "adjusting the torque of the vehicle according to the adjustment mechanism of the torque amount predetermined for the current abnormal state according to the determination result" includes:

when the vehicle is under steering, adjusting the torque of the vehicle according to the first mapping relation;

when the vehicle is in oversteer, adjusting the torque of the vehicle according to the second mapping relation;

wherein the first mapping relationship and the second mapping relationship differ at least in respect of the parameters involved.

Proposal 3 the control method according to proposal 2, characterized in that the parameter involved in the first mapping relationship includes a first parameter, which is a quantity related to a steering wheel angle.

Proposal 4. the control method according to proposal 3, characterized in that the first parameter is a first difference between an actual steering wheel angle corresponding to the present time and a steady-state steering wheel angle.

Proposal 5 the control method according to any one of proposals 2 to 4, characterized in that the parameter involved in the second mapping relationship includes a second parameter that is a quantity related to a yaw rate of the vehicle.

Proposal 6. the control method according to proposal 5, characterized in that the second parameter is a second difference between the ideal yaw rate and the actual yaw rate corresponding to the current time.

A control system of a vehicle, characterized by comprising:

a determination module configured to: under the condition that the vehicle under the steering working condition is abnormal, judging whether the current abnormal state is under steering or over steering; and

a conditioning module configured to: and according to the judgment result, regulating the torque of the vehicle according to a preset torque amount regulation mechanism aiming at the current abnormal state.

The control system of proposal 8, wherein the adjustment module is further configured to:

when the vehicle is under steering, adjusting the torque of the vehicle according to the first mapping relation;

when the vehicle is in oversteer, adjusting the torque of the vehicle according to the second mapping relation;

wherein the first mapping relationship and the second mapping relationship differ at least in respect of the parameters involved.

Proposal 9. the control system according to proposal 8, characterized in that the parameter involved in the first mapping relationship includes a first parameter, which is a quantity related to a steering wheel angle.

Proposal 10. the control system according to proposal 9, characterized in that the first parameter is a first difference between an actual steering wheel angle corresponding to the present time and a steady-state steering wheel angle.

The control system according to any one of claims 8 to 10, characterized in that the parameter involved in the second mapping relationship includes a second parameter that is a quantity related to a yaw rate of the vehicle.

Proposal 12. the control system according to proposal 11, characterized in that the second parameter is a second difference between the ideal yaw rate and the actual yaw rate corresponding to the current time.

A computer-readable storage medium according to claim 13, characterized in that the storage medium is adapted to store a plurality of program codes adapted to be loaded and executed by a processor to perform the control method of the vehicle according to any one of claims 1 to 6.

A control apparatus according to claim 14, characterized in that it comprises a memory and a processor, said memory being adapted to store a plurality of program codes, said program codes being adapted to be loaded and run by said processor to perform the control method of the vehicle according to any one of claims 1 to 6.

An in-vehicle apparatus according to claim 15, characterized by comprising the control device according to claim 14.

A vehicle according to claim 16, characterized by comprising the control device of claim 14; or

The vehicle includes the in-vehicle apparatus of proposal 15.

Drawings

The present invention will be described with reference to the accompanying drawings in conjunction with an electric vehicle in which the vehicle is a front axle powered vehicle (hereinafter referred to simply as a front drive). In the drawings:

fig. 1 is a schematic flow chart illustrating a control method of an electric vehicle according to an embodiment of the invention;

FIG. 2A shows a comparison graph I of measured bend data;

FIG. 2B shows a second comparison of measured bend data;

FIG. 2C shows a third comparison of measured bend data;

FIG. 2D shows a fourth comparison of measured bend data;

FIG. 3A shows a schematic view of the configuration of the racetrack used in the test;

FIG. 3B is a graph illustrating measured data for an electric vehicle passing through each corner of the track of FIG. 3A; and

fig. 4 shows a comparison of acceleration limits of an electric vehicle under the same race track conditions.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the present embodiment is described in connection with a front-wheel drive electric vehicle, this is not intended to limit the scope of the present invention, and those skilled in the art may apply the present invention to other application scenarios without departing from the principles of the present invention. For example, the driving method of the vehicle may be a rear drive, a four-wheel drive, or the like, and the type of the vehicle may be a hybrid vehicle or the like.

It should be noted that, in the description of the present invention, directional terms such as "front", "rear", and "rear", etc., are used with reference to the front-rear direction of the vehicle after the components are mounted to the vehicle. The terms "longitudinal", "longitudinal" and "longitudinal section" are used herein with reference to the front-rear direction of the component after it is mounted to the vehicle, while "lateral", "transverse" and "cross-section" refer to directions perpendicular to the longitudinal direction. The singular forms "a", "an" and "the" may include the plural forms as well. The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, while numerous specific details are set forth in the following description in order to provide a better understanding of the invention, it will be apparent to those skilled in the art that the invention may be practiced without some of these specific details. In some instances, cooktop principles and the like well known to those skilled in the art have not been described in detail in order to highlight the subject matter of the invention.

Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a control method of an electric vehicle according to an embodiment of the present invention. As shown in fig. 1, the control method mainly includes the following steps:

s101, judging whether the electric automobile is in a steering working condition, and if so, turning to S103; if not, the current driving capability of the electric automobile is maintained.

And S103, calculating the steering characteristics of the electric automobile.

S105, judging whether the electric automobile in the steering working condition is in an abnormal state (under steering or over steering) according to the steering characteristic, and if so, turning to S105 or S107 according to the specific abnormal state; if not, the current driving capability of the electric automobile is maintained.

In one possible embodiment, the steering characteristic of the electric vehicle may be determined as understeer or oversteer, for example, based on a difference between an actual steering wheel angle and a steady-state steering wheel angle of the electric vehicle, a difference between an actual yaw rate and an ideal yaw rate, or the like.

It should be noted that the understeer and oversteer are mainly aimed at non-longitudinal running. Specifically, when dynamically adjusting the driving capability (torque), the steering characteristic state of the electric vehicle is determined and whether the electric vehicle is in a longitudinal running state (available input amounts may include, but are not limited to, yaw rate deviation, road adhesion estimation, driving mode, steering wheel angle, lateral acceleration, reference vehicle speed, etc.) is determined, and if the electric vehicle is in the longitudinal running state, the torque is not adjusted. Only in the case where it is determined that the electric vehicle is running in the non-longitudinal direction, dynamic adjustment for understeer and oversteer is performed on the torque while taking into account the influence of the longitudinal characteristics of the load-shifting tire.

S105, when the electric automobile is under-steered in the steering process, comparing the steering wheel angle input by the driver with the steady-state steering wheel angle to determine a first difference (in units of rad), and dynamically adjusting the driving capability of the front axle in a table look-up mode (referring to the following table 1, wherein the table 1 shows the corresponding relation among the first difference, the torque before adjustment and the torque after adjustment when the steering is under-steered), so that the lateral adhesion capability of the front wheels is improved.

TABLE 1 correspondence between first Difference, Pre-conditioned Torque, post-conditioned Torque during understeer

First difference (rad)	-50	-40	-30	-20	-10	0	10	20	30	50	70
												Torque before Regulation (Nm)	2928	2928	2928	2928	2928	2928	2928	2928	2928	2928	2928
High adhesion: adjusted torque (Nm)	2928	2800	2500	2000	1500	1200	1500	2000	2500	2800	2928
												Low adhesion: adjusted torque (Nm)	1756.8	1680	1500	1200	900	720	900	1200	1500	1680	1756.8

By dynamically adjusting the torque, the situation that the lateral capacity of the tire of the front axle is weakened due to excessive torque application in the bending acceleration process is effectively avoided. The principle behind this is that: from the theory of the tire friction circle, under the condition that the wheel load is fixed and the slip angle and the slip rate are the same, the resultant force acting on the wheel is formed by the communication of longitudinal force and lateral force, so that: the more the driving force is applied to the front wheel (and the greater the torque applied, respectively), the less the lateral capacity of the tire of the front wheel.

And S107, when the electric automobile is in the process of over-steering, comparing a second difference (in rad/S, radian/second) between the ideal yaw rate and the actual yaw rate, and dynamically adjusting the torque of the front axle in a table look-up mode (referring to the following table 2, wherein the table 2 shows the corresponding relation among the second difference, the torque before adjustment and the torque after adjustment in the process of over-steering), so that the lateral adhesion capacity of the front wheels is improved. Through dynamic adjustment of the torque, the situation that the lateral capacity of the front wheel is weakened due to excessive torque application in the posture correcting process of the electric automobile is avoided.

TABLE 2 correspondences between first Difference, Pre-conditioned Torque, post conditioned Torque during oversteer

Therefore, the abnormal states of the electric automobile under steering and over steering are intervened to a certain extent in a dynamic torque adjusting mode, so that the accurate control of the electric automobile during the steering period is realized, and the performance of the electric automobile is ensured.

Obviously, table 1 and table 2 are only a specific form of the first mapping relationship and the second mapping relationship, and those skilled in the art may change table 1 and table 2 to some extent or to other representation forms according to actual requirements.

Referring to fig. 2A, 2B, 2C and 2D, fig. 2A, 2B, 2C and 2D show comparative plots one, two, three and four, respectively, of bend survey data. The abscissa in fig. 2A, 2B, 2C, and 2D is the bending-out time of the steering condition, and the ordinate in fig. 2A, 2B, 2C, and 2D is the percentage of the accelerator pedal (in%, describing the opening degree of the accelerator pedal), the steering wheel angle (in deg), the lateral acceleration (in g), and the longitudinal acceleration (in g) corresponding to the bending-out time, respectively. In the figure, the solid line corresponds to Track Mode data to which the control method of the present invention is applied, and the broken line corresponds to Sport Mode data to which the control method of the present invention is not applied. As can be seen from the two sets of data in the extreme states of lateral acceleration shown in fig. 2A, 2B, 2C and 2D, for the electric vehicle with a front axle having a power source, it is desirable to increase the bending speed, but it is necessary to overcome the steering deficiency caused by the lateral adhesion attenuation of the front wheel under the lateral acceleration condition. If the driver only controls the vehicle, the driver needs to release an accelerator pedal and even brake the operation of controlling the bending-out vehicle speed, so that the bending-out vehicle speed is reduced, and the driving experience is influenced. The Track Mode adopting the control method of the invention allows a driver to step on a deeper pedal percentage and rotate a smaller steering wheel corner under most conditions, and the electric automobile still has higher longitudinal acceleration under the lateral working condition, so that the driving experience is also improved on the premise of obviously improving the steering insufficiency.

Referring to fig. 3A and 3B, fig. 3A shows a schematic view of a configuration of a track used in the test, and fig. 3B shows a comparison of measured data when the electric vehicle passes through each corner of the track in fig. 3A. The solid line in fig. 3B corresponds to data in which the control method of the present invention (dynamic torque adjustment is involved) is employed, and the broken line corresponds to data in which the control method of the present invention (dynamic torque adjustment is not involved) is not employed. The abscissa in fig. 3B is the bend angles (3, 4, 5, 6, 7) in this order, and the three ordinates in fig. 3B are the over-bent vehicle speed, the steering wheel angle, and the lateral acceleration corresponding to a certain bend angle (when the electric vehicle passes through a certain bend angle), respectively. It can be seen that as the electric vehicle passes through the same bend angle in the track, the angle at which the driver operates the steering wheel is reduced, but the over-speed increases and the lateral acceleration remains at a limited level. When dynamic torque adjustment is participated, the lateral limit of the electric automobile is further improved under most conditions, and the steering wheel turning angle is reduced while the over-bending speed is improved.

Referring to fig. 4, fig. 4 is a graph illustrating a comparison of longitudinal acceleration and lateral acceleration limits of the electric vehicle shown in fig. 3A under the track. In fig. 4, the abscissa represents the longitudinal acceleration (in g) of the electric vehicle, the ordinate represents the lateral acceleration (in g) of the electric vehicle, the solid portion in the figure corresponds to the Track Mode data using the control method of the present invention, and the hollow portion corresponds to the Sport Mode data not using the control method of the present invention. It can be seen that the lateral limit capability of the electric vehicle increases significantly when dynamic torque modulation is engaged.

Fig. 3(A, B) and fig. 4 are derived from the same set of experimental data for the racetrack. Fig. 4 shows the comparison data of the acceleration limit of the whole track, while fig. 3(A, B) is mainly the comparison data when decomposing into a certain curve of the track, namely: and when the electric automobile passes through each bend angle of a certain bend, transverse comparison data among the speed of the over-bent automobile, the steering wheel angle and the lateral acceleration are obtained.

It can be seen that the intervention of the torque adjusting mechanism based on the control method of the electric automobile improves the electric automobile under the condition of the electric automobile with understeer and oversteer.

It should be noted that, although the foregoing embodiments describe each step in a specific sequence, those skilled in the art may understand that, in order to achieve the effect of the present invention, different steps do not have to be executed in such a sequence, and may be executed simultaneously or in other sequences, and some steps may be added, replaced or omitted, and these changes are within the protection scope of the present invention. Such as may be: changes are made to tables 1 and 2 for the query; and the like.

It should be noted that, although the control method configured in the above-described specific manner is described as an example, those skilled in the art will appreciate that the present invention should not be limited thereto. In fact, the user can flexibly adjust the relevant steps and the elements such as parameters in the steps according to the situation such as the actual application scene, etc., such as: further subdividing the abnormal state; and the like.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.