1. A braking energy recovery control method for an electric automobile is characterized by comprising the following steps:

acquiring brake pedal opening information, vehicle speed information and deceleration information of the electric vehicle, and determining total torque of a brake energy recovery motor according to the brake pedal opening information and the vehicle speed information;

calculating the torque distribution proportion of the front and rear driving motors according to the deceleration information;

and determining the torques of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution proportion of the front and rear driving motors, and respectively sending the torques of the front and rear driving motors to the front and rear motor control units so that the front and rear motor control units control the front and rear driving motors of the electric automobile to recover the braking energy according to the torques of the front and rear driving motors.

2. The method of claim 1, wherein obtaining brake pedal opening information, vehicle speed information, and deceleration information of the electric vehicle comprises:

acquiring brake pedal opening information of the electric automobile, which is detected by a brake pedal opening sensor;

acquiring the vehicle speed information sent by a vehicle body stability control system, wherein the vehicle speed information is obtained by converting a wheel speed signal detected by a vehicle wheel speed sensor after the vehicle body stability control system receives the wheel speed signal;

and acquiring deceleration information of the electric automobile detected by the vehicle longitudinal acceleration sensor.

3. The method of claim 1, wherein determining a total braking energy recovery motor torque based on the brake pedal opening information and the vehicle speed information comprises:

and inquiring the total torque of the braking energy recovery motor corresponding to the opening information of the braking pedal and the vehicle speed information in a calibrated two-dimensional table, wherein the calibrated two-dimensional table is about the corresponding relation among the opening information of the braking pedal, the vehicle speed information and the total torque of the braking energy recovery motor.

4. The method according to claim 1, wherein calculating a torque distribution ratio of front and rear drive motors based on the deceleration information includes:

calculation formula according to normal reaction force of front wheelCalculating front wheel normal reaction force, wherein F_z1Representing the normal reaction force of the front wheel, G representing the gravity of the electric automobile, b representing the distance from the center of mass of the electric automobile to the center line of a rear axle, and m representing the distance from the center line of the electric automobileMass, a' representing said deceleration information, h_gRepresenting the height of the center of mass of the electric automobile, and L representing the wheelbase of the electric automobile;

calculation formula according to normal reaction force of rear wheelCalculating the rear wheel normal reaction force, wherein F_z2Representing the normal reaction force of the rear wheels, G representing the gravity of the electric automobile, a representing the distance from the center of mass of the electric automobile to the center line of a front axle, m representing the mass of the electric automobile, a' representing the deceleration information, h_gRepresenting the height of the center of mass of the electric automobile, and L representing the wheelbase of the electric automobile;

calculating formula according to torque distribution proportion of front drive motorCalculating a torque distribution ratio of the front drive motor, wherein W₁Representing the torque distribution ratio of the front drive motor, F_z1Representing said front wheel normal reaction force, F_z2Representing the rear wheel normal reaction force;

calculating formula according to torque distribution proportion of rear drive motorCalculating a torque distribution ratio of the rear drive motor, wherein W₂Representing the torque distribution ratio of the rear drive motor, F_z1Representing said front wheel normal reaction force, F_z2Representing the rear wheel normal reaction force.

5. The method of claim 1, wherein determining the torques of the front and rear drive motors according to the total torque of the braking energy recovery motor and the torque distribution ratio of the front and rear drive motors comprises:

calculation formula F from the torque of the front drive motor_Xb1＝F_allgW₁Calculating the torque of the front drive motor, wherein F_Xb1Representing the torque of said front drive motor, F_allRepresenting the total torque, W, of said braking energy recovery motor₁Indicating a torque distribution ratio of the front drive motor;

calculation formula F from the torque of the rear drive motor_Xb2＝F_allgW₂Calculating the torque of the rear drive motor, wherein F_Xb2Representing the torque of said rear drive motor, F_allRepresenting the total torque, W, of said braking energy recovery motor₂The torque distribution ratio of the rear drive motor is indicated.

6. The method according to claim 2, wherein the electric vehicle braking energy recovery control method is applied to a vehicle control unit, and the vehicle body stability control system is connected with the vehicle control unit through a CAN network.

7. The utility model provides an electric automobile braking energy recovery controlling means which characterized in that includes:

the acquiring and determining unit is used for acquiring the opening information of a brake pedal, the vehicle speed information and the deceleration information of the electric vehicle and determining the total torque of a brake energy recovery motor according to the opening information of the brake pedal and the vehicle speed information;

a calculating unit for calculating a torque distribution ratio of the front and rear drive motors based on the deceleration information;

and the determining unit is used for determining the torques of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution proportion of the front and rear driving motors, and respectively sending the torques of the front and rear driving motors to the front and rear motor control units so that the front and rear motor control units control the front and rear driving motors of the electric automobile to recover the braking energy according to the torques of the front and rear driving motors.

8. The apparatus of claim 7, wherein the acquisition and determination unit is further configured to:

acquiring brake pedal opening information of the electric automobile, which is detected by a brake pedal opening sensor;

acquiring the vehicle speed information sent by a vehicle body stability control system, wherein the vehicle speed information is obtained by converting a wheel speed signal detected by a vehicle wheel speed sensor after the vehicle body stability control system receives the wheel speed signal;

and acquiring deceleration information of the electric automobile detected by the vehicle longitudinal acceleration sensor.

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any of the preceding claims 1 to 6 are implemented when the computer program is executed by the processor.

10. A computer readable storage medium having stored thereon machine executable instructions which, when invoked and executed by a processor, cause the processor to perform the method of any of claims 1 to 6.

Background

For an electric automobile driven by two front and rear motors during braking and deceleration, a commonly used braking energy recovery strategy at present is to realize braking energy recovery by distributing the front and rear motors according to a certain fixed proportion of torque, and the distribution mode has certain defects: when the vehicle brakes and decelerates, the gravity center of the vehicle can shift, so that the normal reaction forces acting on the front wheel and the rear wheel on the ground are different, if the braking energy recovery is realized according to the fixed proportion torque distribution, the front wheel and the rear wheel cannot fully utilize the adhesion coefficient of the ground, the maximum braking energy recovery cannot be carried out, the vehicle can be braked insufficiently, and the braking distance is long.

For example, when an electric vehicle brakes and decelerates, the braking energy that needs to be recovered is 100N, and it is assumed that the braking energy is calculated according to 1: 1, the front motor and the rear motor need to respectively recover 50N braking energy, but when the electric automobile brakes and decelerates, the gravity center of the electric automobile moves forwards, namely the positive pressure of the front wheel to the ground is larger, the positive pressure of the rear wheel to the ground is reduced, if the rear wheel still recovers the braking energy according to the requirements, under the condition that the ground adhesion coefficient is certain, the phenomenon of skidding possibly occurs between the rear wheel and the ground (because the positive pressure of the rear wheel to the ground is reduced, the corresponding friction force is reduced), so that the braking energy recovered by the rear wheel motor is smaller than 50N, the maximization of the braking energy recovery cannot be realized, the insufficient braking of the automobile can be caused, and the braking distance is long.

In conclusion, the conventional braking energy recovery control method for the electric vehicle is unreasonable, cannot improve the energy recovery utilization rate to the maximum extent under a certain ground adhesion condition, and cannot shorten the braking distance of the vehicle.

Disclosure of Invention

In view of the above, the present invention provides a method, an apparatus, and an electronic device for controlling braking energy recovery of an electric vehicle, so as to solve the technical problems that the existing method for controlling braking energy recovery of an electric vehicle is unreasonable, cannot improve the energy recovery and utilization ratio to the maximum extent under a certain ground adhesion condition, and cannot shorten the braking distance of the vehicle.

In a first aspect, an embodiment of the present invention provides a method for controlling braking energy recovery of an electric vehicle, including:

acquiring brake pedal opening information, vehicle speed information and deceleration information of the electric vehicle, and determining total torque of a brake energy recovery motor according to the brake pedal opening information and the vehicle speed information;

calculating the torque distribution proportion of the front and rear driving motors according to the deceleration information;

and determining the torques of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution proportion of the front and rear driving motors, and respectively sending the torques of the front and rear driving motors to the front and rear motor control units so that the front and rear motor control units control the front and rear driving motors of the electric automobile to recover the braking energy according to the torques of the front and rear driving motors.

Further, acquiring the brake pedal opening information, the vehicle speed information and the deceleration information of the electric vehicle comprises the following steps:

acquiring brake pedal opening information of the electric automobile, which is detected by a brake pedal opening sensor;

acquiring the vehicle speed information sent by a vehicle body stability control system, wherein the vehicle speed information is obtained by converting a wheel speed signal detected by a vehicle wheel speed sensor after the vehicle body stability control system receives the wheel speed signal;

and acquiring deceleration information of the electric automobile detected by the vehicle longitudinal acceleration sensor.

Further, determining the total torque of the braking energy recovery motor according to the opening information of the braking pedal and the vehicle speed information comprises the following steps:

and inquiring the total torque of the braking energy recovery motor corresponding to the opening information of the braking pedal and the vehicle speed information in a calibrated two-dimensional table, wherein the calibrated two-dimensional table is about the corresponding relation among the opening information of the braking pedal, the vehicle speed information and the total torque of the braking energy recovery motor.

Further, calculating a torque distribution ratio of the front and rear driving motors based on the deceleration information includes:

calculation formula according to normal reaction force of front wheelCalculating front wheel normal reaction force, wherein F_z1Representing the normal reaction force of the front wheel, G representing the gravity of the electric automobile, b representing the distance from the center of mass of the electric automobile to the center line of a rear axle, m representing the mass of the electric automobile, a' representing the deceleration information, h_gRepresents the height of the center of mass of the electric automobile,l represents the front-rear wheel base of the electric automobile;

calculation formula according to normal reaction force of rear wheelCalculating the rear wheel normal reaction force, wherein F_z2Representing the normal reaction force of the rear wheels, G representing the gravity of the electric automobile, a representing the distance from the center of mass of the electric automobile to the center line of a front axle, m representing the mass of the electric automobile, a' representing the deceleration information, h_gRepresenting the height of the center of mass of the electric automobile, and L representing the wheelbase of the electric automobile;

calculating formula according to torque distribution proportion of front drive motorCalculating a torque distribution ratio of the front drive motor, wherein W₁Representing the torque distribution ratio of the front drive motor, F_z1Representing said front wheel normal reaction force, F_z2Representing the rear wheel normal reaction force;

calculating formula according to torque distribution proportion of rear drive motorCalculating a torque distribution ratio of the rear drive motor, wherein W₂Representing the torque distribution ratio of the rear drive motor, F_z1Representing said front wheel normal reaction force, F_z2Representing the rear wheel normal reaction force.

Further, determining the torque of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution proportion of the front and rear driving motors includes:

calculation formula F from the torque of the front drive motor_Xb1＝F_allgW₁Calculating the torque of the front drive motor, wherein F_Xb1Representing the torque of said front drive motor, F_allRepresenting the total torque, W, of said braking energy recovery motor₁Representing the torque of the front drive motorDistributing proportion;

calculation formula F from the torque of the rear drive motor_Xb2＝F_allgW₂Calculating the torque of the rear drive motor, wherein F_Xb2Representing the torque of said rear drive motor, F_allRepresenting the total torque, W, of said braking energy recovery motor₂The torque distribution ratio of the rear drive motor is indicated.

Furthermore, the electric automobile braking energy recovery control method is applied to a whole automobile control unit, and the automobile body stability control system is connected with the whole automobile control unit through a CAN network.

In a second aspect, an embodiment of the present invention further provides a braking energy recovery control device for an electric vehicle, including:

the acquiring and determining unit is used for acquiring the opening information of a brake pedal, the vehicle speed information and the deceleration information of the electric vehicle and determining the total torque of a brake energy recovery motor according to the opening information of the brake pedal and the vehicle speed information;

a calculating unit for calculating a torque distribution ratio of the front and rear drive motors based on the deceleration information;

and the determining unit is used for determining the torques of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution proportion of the front and rear driving motors, and respectively sending the torques of the front and rear driving motors to the front and rear motor control units so that the front and rear motor control units control the front and rear driving motors of the electric automobile to recover the braking energy according to the torques of the front and rear driving motors.

Further, the obtaining and determining unit is further configured to:

acquiring brake pedal opening information of the electric automobile, which is detected by a brake pedal opening sensor;

acquiring the vehicle speed information sent by a vehicle body stability control system, wherein the vehicle speed information is obtained by converting a wheel speed signal detected by a vehicle wheel speed sensor after the vehicle body stability control system receives the wheel speed signal;

and acquiring deceleration information of the electric automobile detected by the vehicle longitudinal acceleration sensor.

In a third aspect, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to any one of the above first aspects when executing the computer program.

In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium storing machine executable instructions, which when invoked and executed by a processor, cause the processor to perform the method of any of the first aspect.

In an embodiment of the present invention, a braking energy recovery control method for an electric vehicle is provided, including: the method comprises the steps of firstly, obtaining opening information, speed information and deceleration information of a brake pedal of the electric automobile, and determining total torque of a brake energy recovery motor according to the opening information and the speed information of the brake pedal; then, calculating the torque distribution proportion of the front and rear driving motors according to the deceleration information; and finally, determining the torques of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution proportion of the front and rear driving motors, and respectively sending the torques of the front and rear driving motors to the front and rear motor control units so that the front and rear motor control units control the front and rear driving motors of the electric automobile to recover the braking energy according to the torques of the front and rear driving motors. According to the braking energy recovery control method for the electric automobile, the torque distribution proportion of the front driving motor and the rear driving motor is determined according to the deceleration information of the electric automobile, the adhesion coefficient of the ground can be fully utilized, the energy recovery utilization rate is improved to the greatest extent under a certain ground adhesion coefficient, the braking distance of the automobile is shortened, and the technical problems that the existing braking energy recovery control method for the electric automobile is unreasonable, the energy recovery utilization rate cannot be improved to the greatest extent under a certain ground adhesion condition, and the braking distance of the automobile cannot be shortened are solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a flowchart of a braking energy recovery control method for an electric vehicle according to an embodiment of the present invention;

fig. 2 is a flowchart of calculating a torque distribution ratio of the front and rear driving motors according to deceleration information according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the stress of the electric vehicle during braking according to the embodiment of the present invention;

fig. 4 is a schematic view of a braking energy recovery control device for an electric vehicle according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

At present, a common braking energy recovery strategy is to realize braking energy recovery by distributing front and rear motors according to a certain fixed proportion of torque, and the distribution mode has certain defects: when the vehicle brakes and decelerates, the gravity center of the vehicle can shift, so that the normal reaction forces acting on the front wheel and the rear wheel on the ground are different, if the braking energy recovery is realized according to the fixed proportion torque distribution, the front wheel and the rear wheel cannot fully utilize the adhesion coefficient of the ground, the maximum braking energy recovery cannot be carried out, the vehicle can be braked insufficiently, and the braking distance is long.

Based on the above, the present embodiment provides a braking energy recovery control method for an electric vehicle, which determines a torque distribution ratio of front and rear driving motors according to deceleration information of the electric vehicle, and can fully utilize an adhesion coefficient of the ground, improve energy recovery utilization ratio to the maximum extent under a certain ground adhesion coefficient, and shorten a braking distance of the vehicle.

Embodiments of the present invention are further described below with reference to the accompanying drawings.

The first embodiment is as follows:

according to an embodiment of the present invention, there is provided an embodiment of a braking energy recovery control method for an electric vehicle, where it is noted that the steps illustrated in the flowchart of the drawings may be executed in a computer system, such as a set of computer executable instructions, and that although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be executed in an order different from that described herein.

Fig. 1 is a flowchart of a braking energy recovery control method for an electric vehicle according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:

step S102, obtaining the opening information of a brake pedal, the vehicle speed information and the deceleration information of the electric vehicle, and determining the total torque of a brake energy recovery motor according to the opening information of the brake pedal and the vehicle speed information;

in the embodiment of the present invention, the energy recovery refers to a process in which a driving motor of a vehicle functions as a generator to convert kinetic energy of the vehicle into electric energy. The braking energy recovery control method of the electric automobile is applied to a Vehicle Control Unit (VCU).

This process is described in detail below.

Step S104, calculating the torque distribution proportion of the front and rear driving motors according to the deceleration information;

and step S106, determining the torques of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution proportion of the front and rear driving motors, and respectively sending the torques of the front and rear driving motors to the front and rear motor control units so that the front and rear motor control units control the front and rear driving motors of the electric automobile to recover the braking energy according to the torques of the front and rear driving motors.

Specifically, after the torques of the front and rear driving motors (i.e., the torque of the front driving motor and the torque of the rear driving motor) are obtained, the torque of the front driving motor is sent to the front motor control unit, and the torque of the rear driving motor is sent to the rear motor control unit, so that the front motor control unit controls the front driving motor of the electric vehicle to recover the braking energy according to the torque of the front driving motor, and meanwhile, the rear motor control unit controls the rear driving motor of the electric vehicle to recover the braking energy according to the torque of the rear driving motor.

In an embodiment of the present invention, a braking energy recovery control method for an electric vehicle is provided, including: the method comprises the steps of firstly, obtaining opening information, speed information and deceleration information of a brake pedal of the electric automobile, and determining total torque of a brake energy recovery motor according to the opening information and the speed information of the brake pedal; then, calculating the torque distribution proportion of the front and rear driving motors according to the deceleration information; and finally, determining the torques of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution proportion of the front and rear driving motors, and respectively sending the torques of the front and rear driving motors to the front and rear motor control units so that the front and rear motor control units control the front and rear driving motors of the electric automobile to recover the braking energy according to the torques of the front and rear driving motors. According to the braking energy recovery control method for the electric automobile, the torque distribution proportion of the front driving motor and the rear driving motor is determined according to the deceleration information of the electric automobile, the adhesion coefficient of the ground can be fully utilized, the energy recovery utilization rate is improved to the greatest extent under a certain ground adhesion coefficient, the braking distance of the automobile is shortened, and the technical problems that the existing braking energy recovery control method for the electric automobile is unreasonable, the energy recovery utilization rate cannot be improved to the greatest extent under a certain ground adhesion condition, and the braking distance of the automobile cannot be shortened are solved.

The foregoing description briefly introduces the braking energy recovery control method for an electric vehicle, and the following detailed description refers to the specific details.

In an optional embodiment of the present invention, the obtaining of the brake pedal opening information, the vehicle speed information and the deceleration information of the electric vehicle specifically includes the following steps:

(1) acquiring brake pedal opening information of the electric automobile detected by a brake pedal opening sensor;

(2) acquiring vehicle speed information sent by a vehicle body stability control system, wherein the vehicle speed information is obtained by converting a wheel speed signal detected by a vehicle wheel speed sensor after the vehicle body stability control system receives the wheel speed signal;

(3) and acquiring deceleration information of the electric automobile detected by the vehicle longitudinal acceleration sensor.

In the embodiment of the invention, a brake pedal opening sensor is arranged on the electric automobile, the brake pedal opening sensor detects the brake pedal opening information of the electric automobile in real time and sends the detected brake pedal opening information to a whole automobile control unit; the electric automobile is also provided with a vehicle wheel speed sensor, the vehicle wheel speed sensor detects a wheel speed signal of the electric automobile in real time and sends the wheel speed signal to the automobile body stability control system, the automobile body stability control system converts the wheel speed signal to obtain the speed information of the electric automobile, and finally the automobile body stability control system sends the speed information of the electric automobile to the whole automobile control unit through the CAN network; in addition, a vehicle longitudinal acceleration sensor (forward/backward direction) is further mounted on the electric vehicle, the vehicle longitudinal acceleration sensor detects deceleration information of the electric vehicle in real time and sends the deceleration information to the vehicle body stability control system, and then the vehicle body stability control system sends the deceleration information to the whole vehicle control unit through the CAN network.

In an optional embodiment of the present invention, determining the total torque of the braking energy recovery motor according to the opening degree information of the brake pedal and the vehicle speed information specifically includes: and inquiring the total torque of the braking energy recovery motor corresponding to the opening information of the braking pedal and the vehicle speed information in a calibrated two-dimensional table, wherein the calibrated two-dimensional table is the corresponding relation between the opening information of the braking pedal, the vehicle speed information and the total torque of the braking energy recovery motor.

It should be noted that: the calibrated two-dimensional table is obtained by calibration in the development process, and the table coordinates are the opening information of the brake pedal and the vehicle speed information.

In an alternative embodiment of the present invention, referring to fig. 2, the step S104, which calculates the torque distribution ratio of the front and rear driving motors according to the deceleration information, specifically includes the following steps:

step S201, calculating formula according to normal reaction force of front wheelCalculating front wheel normal reaction force, wherein F_z1Representing the normal reaction force of a front wheel, G representing the gravity of the electric automobile, b representing the distance from the center of mass of the electric automobile to the central line of a rear axle, m representing the mass of the electric automobile, a' representing deceleration information, h_gThe height of the center of mass of the electric automobile is represented, and L represents the wheelbase of the electric automobile;

step S202, calculating formula according to normal reaction force of rear wheelCalculating the rear wheel normal reaction force, wherein F_z2Representing the normal reaction force of a rear wheel, G representing the gravity of the electric automobile, a representing the distance from the center of mass of the electric automobile to the center line of a front axle, m representing the mass of the electric automobile, a' representing deceleration information, h_gThe height of the center of mass of the electric automobile is represented, and L represents the wheelbase of the electric automobile;

step S203, calculating a formula according to the torque distribution ratio of the front drive motorCalculating a torque distribution ratio of the front drive motor, wherein W₁Shows the torque distribution ratio of the front drive motor, F_z1Indicating front wheel normal reaction force, F_z2Representing a rear wheel normal reaction force;

step S204Calculating the formula according to the torque distribution ratio of the rear drive motorCalculating a torque distribution ratio of the rear drive motor, wherein W₂Shows the torque distribution ratio of the rear drive motor, F_z1Indicating front wheel normal reaction force, F_z2Indicating the rear wheel normal reaction force.

Fig. 3 shows the stress condition of the electric vehicle during braking, and the meaning of each parameter in the diagram is the same as that of each parameter in the above process, and is not described again.

In an optional embodiment of the present invention, determining the torques of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution ratio of the front and rear driving motors specifically includes: calculation formula F from the torque of the front drive motor_Xb1＝F_allgW₁Calculating the torque of the front drive motor, wherein F_Xb1Representing the torque of the front drive motor, F_allRepresenting the total torque, W, of the braking energy recovery motor₁Indicating a torque distribution ratio of the front drive motor; calculation formula F from the torque of the rear drive motor_Xb2＝F_allgW₂Calculating the torque of the rear drive motor, wherein F_Xb2Representing the torque of the rear drive motor, F_allRepresenting the total torque, W, of the braking energy recovery motor₂The torque distribution ratio of the rear drive motor is indicated.

The braking energy recovery control method of the electric automobile can fully utilize the ground adhesion coefficient, improve the energy recovery utilization rate to the maximum extent under a certain ground adhesion coefficient, and shorten the braking distance of the automobile.

Example two:

the embodiment of the invention also provides a braking energy recovery control device for an electric vehicle, which is mainly used for executing the braking energy recovery control method for the electric vehicle provided by the first embodiment of the invention, and the braking energy recovery control device for the electric vehicle provided by the embodiment of the invention is specifically described below.

Fig. 4 is a schematic diagram of a braking energy recovery control device for an electric vehicle according to an embodiment of the present invention, and as shown in fig. 4, the braking energy recovery control device mainly includes: an acquisition and determination unit 10, a calculation unit 20 and a determination unit 30, wherein:

the acquiring and determining unit is used for acquiring the opening information of a brake pedal, the vehicle speed information and the deceleration information of the electric vehicle and determining the total torque of the brake energy recovery motor according to the opening information of the brake pedal and the vehicle speed information;

a calculation unit for calculating a torque distribution ratio of the front and rear drive motors based on the deceleration information;

and the determining unit is used for determining the torques of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution proportion of the front and rear driving motors, and respectively sending the torques of the front and rear driving motors to the front and rear motor control units so that the front and rear motor control units control the front and rear driving motors of the electric automobile to recover the braking energy according to the torques of the front and rear driving motors.

In an embodiment of the present invention, there is provided a braking energy recovery control device for an electric vehicle, including: the method comprises the steps of firstly, obtaining opening information, speed information and deceleration information of a brake pedal of the electric automobile, and determining total torque of a brake energy recovery motor according to the opening information and the speed information of the brake pedal; then, calculating the torque distribution proportion of the front and rear driving motors according to the deceleration information; and finally, determining the torques of the front and rear driving motors according to the total torque of the braking energy recovery motor and the torque distribution proportion of the front and rear driving motors, and respectively sending the torques of the front and rear driving motors to the front and rear motor control units so that the front and rear motor control units control the front and rear driving motors of the electric automobile to recover the braking energy according to the torques of the front and rear driving motors. According to the braking energy recovery control device for the electric automobile, the torque distribution proportion of the front driving motor and the rear driving motor is determined according to the deceleration information of the electric automobile, the adhesion coefficient of the ground can be fully utilized, the energy recovery utilization rate is improved to the greatest extent under a certain ground adhesion coefficient, the braking distance of the automobile is shortened, and the technical problems that the braking energy recovery control method for the electric automobile is unreasonable, the energy recovery utilization rate cannot be improved to the greatest extent under a certain ground adhesion condition, and the braking distance of the automobile cannot be shortened are solved.

Optionally, the obtaining and determining unit is further configured to: acquiring brake pedal opening information of the electric automobile detected by a brake pedal opening sensor; acquiring vehicle speed information sent by a vehicle body stability control system, wherein the vehicle speed information is obtained by converting a wheel speed signal detected by a vehicle wheel speed sensor after the vehicle body stability control system receives the wheel speed signal; and acquiring deceleration information of the electric automobile detected by the vehicle longitudinal acceleration sensor.

Optionally, the obtaining and determining unit is further configured to: and inquiring the total torque of the braking energy recovery motor corresponding to the opening information of the braking pedal and the vehicle speed information in a calibrated two-dimensional table, wherein the calibrated two-dimensional table is the corresponding relation between the opening information of the braking pedal, the vehicle speed information and the total torque of the braking energy recovery motor.

Optionally, the computing unit is further configured to: calculation formula according to normal reaction force of front wheelCalculating front wheel normal reaction force, wherein F_z1Representing the normal reaction force of a front wheel, G representing the gravity of the electric automobile, b representing the distance from the center of mass of the electric automobile to the central line of a rear axle, m representing the mass of the electric automobile, a' representing deceleration information, h_gThe height of the center of mass of the electric automobile is represented, and L represents the wheelbase of the electric automobile; calculation formula according to normal reaction force of rear wheelCalculating the rear wheel normal reaction force, wherein F_z2Representing the normal reaction force of a rear wheel, G representing the gravity of the electric automobile, a representing the distance from the center of mass of the electric automobile to the center line of a front axle, m representing the mass of the electric automobile, a' representing deceleration information, h_gRepresents the height of the center of mass of the electric automobile, and L represents the front and back of the electric automobileThe wheel base; calculating formula according to torque distribution proportion of front drive motorCalculating a torque distribution ratio of the front drive motor, wherein W₁Shows the torque distribution ratio of the front drive motor, F_z1Indicating front wheel normal reaction force, F_z2Representing a rear wheel normal reaction force; calculating formula according to torque distribution proportion of rear drive motorCalculating a torque distribution ratio of the rear drive motor, wherein W₂Shows the torque distribution ratio of the rear drive motor, F_z1Indicating front wheel normal reaction force, F_z2Indicating the rear wheel normal reaction force.

Optionally, the determining unit is further configured to: calculation formula F from the torque of the front drive motor_Xb1＝F_allgW₁Calculating the torque of the front drive motor, wherein F_Xb1Representing the torque of the front drive motor, F_allRepresenting the total torque, W, of the braking energy recovery motor₁Indicating a torque distribution ratio of the front drive motor; calculation formula F from the torque of the rear drive motor_Xb2＝F_allgW₂Calculating the torque of the rear drive motor, wherein F_Xb2Representing the torque of the rear drive motor, F_allRepresenting the total torque, W, of the braking energy recovery motor₂The torque distribution ratio of the rear drive motor is indicated.

Optionally, the electric vehicle braking energy recovery control method is applied to a vehicle control unit, and the vehicle body stability control system is connected with the vehicle control unit through a CAN network.

The device provided by the embodiment of the present invention has the same implementation principle and technical effect as the method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments without reference to the device embodiments.

As shown in fig. 5, an electronic device 600 provided in an embodiment of the present application includes: the braking energy recovery control method of the electric vehicle comprises a processor 601, a memory 602 and a bus, wherein the memory 602 stores machine-readable instructions executable by the processor 601, when the electronic device runs, the processor 601 and the memory 602 communicate through the bus, and the processor 601 executes the machine-readable instructions to execute the steps of the braking energy recovery control method of the electric vehicle.

Specifically, the memory 602 and the processor 601 can be general memories and processors, which are not limited to the specific embodiments, and the braking energy recovery control method for the electric vehicle can be executed when the processor 601 runs a computer program stored in the memory 602.

The processor 601 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 601. The Processor 601 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 602, and the processor 601 reads the information in the memory 602 and completes the steps of the method in combination with the hardware thereof.

Corresponding to the braking energy recovery control method for the electric vehicle, an embodiment of the present application further provides a computer-readable storage medium, where a machine-executable instruction is stored in the computer-readable storage medium, and when the computer-executable instruction is called and executed by a processor, the computer-executable instruction causes the processor to execute the step of the braking energy recovery control method for the electric vehicle.

The braking energy recovery control device for the electric vehicle provided by the embodiment of the application can be specific hardware on equipment or software or firmware installed on the equipment. The device provided by the embodiment of the present application has the same implementation principle and technical effect as the foregoing method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing method embodiments where no part of the device embodiments is mentioned. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the foregoing systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.

For another example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing an electronic device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the vehicle marking method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus once an item is defined in one figure, it need not be further defined and explained in subsequent figures, and moreover, the terms "first", "second", "third", etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the scope of the embodiments of the present application. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.