Energy recovery system under four drive motors of new energy vehicle

Abstract

The utility model discloses an energy recovery system under four drive motors of a new energy vehicle, each vehicle of the new energy vehicle is provided with a wheel-side motor, all the wheel-side motors are connected with a VCU and output motor energy recovery capability signals to the VCU, the VCU outputs the energy recovery capability signals of each wheel-side motor to an ESP, and the ESP outputs the energy recovery capability signals of each wheel-side motor. The ESP outputs a braking torque signal of each wheel to the VCU, and the VCU is connected with and outputs a torque recovery execution signal to each corresponding wheel side motor. According to the utility model, more accurate torque recovery control can be realized, the braking torque required by the four driving wheel ends is calculated in real time by the chassis ESP system, the high SOC and the low SOC are ensured to have the same energy recovery efficiency and deceleration feeling, and the safety performance of the vehicle is improved while environmental protection and energy saving are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric automobile energy recovery technical field. BACKGROUND

[0002] The existing new energy vehicle realizes four-wheel drive control through one motor in front and one motor in back to realize automatic torque distribution through differential, and when energy is recovered, the chassis system distributes to VCU, and VCU distributes front and back motor recovery torque according to front and back motor torque recovery capacity.

[0003] The conventional vehicle braking energy recovery system currently has air pressure type braking energy recovery, and similar systems include a brake chamber, front and back axle motors and differentials, front and back axle overflow valves, front and back axle electric control exhaust valves, front and back axle air pressure sensors, pedal displacement sensors, brake pedals and brake valves, front and back axle dry gas cylinders, front and back axle air pressure circuit three-ways, and a vehicle controller. The front and back axle motors are installed on the front and back axle differentials. The front and back axle overflow valves and the front and back axle electric control exhaust valves are connected in series on the front and back axle braking circuit. The front and back axle air pressure sensors are installed on the front and back axle braking circuit. The pedal displacement sensors are installed on the brake pedals. The front and back axle dry gas cylinders are connected to the brake valves through air pressure pipelines. The vehicle controller can receive the front and back axle air pressure braking circuit pressure signals and the pedal displacement signals through signal lines and send control signals to the front and back axle motors and the electric control exhaust valves.

[0004] For example, the publication number is CN204895435U, the publication date is December 23, 2015, and the patent name is a vehicle braking energy recovery control system. The disclosed vehicle braking energy recovery control system includes an ABS electric control unit, a brake master valve, a front axle brake chamber, a rear axle brake chamber, a first electromagnetic valve assembly, a second electromagnetic valve assembly, a fast release valve, a first valve body linked with the brake master valve, a second valve body linked with the brake master valve, a wheel speed detection device, and a first relay valve. The brake master valve has a first circuit air outlet and a second circuit air outlet. The front axle brake chamber is connected with the first electromagnetic valve assembly, the fast release valve, the first valve body, and the second circuit air outlet in sequence through a control pipeline. The rear axle brake chamber is connected with the second electromagnetic valve assembly, the first relay valve, the second valve body, and the first circuit air outlet in sequence through a control pipeline. The ABS electric control unit is electrically connected with the first electromagnetic valve assembly, the second electromagnetic valve assembly, and the wheel speed detection device.

[0005] When the new energy vehicle is driven by four motors respectively, the torque recovery strategy needs to be adjusted when braking or coasting, so the existing recovery system cannot meet the efficient four-wheel drive motor energy recovery. SUMMARY

[0006] The technical problem to be solved by the utility model is to realize a new torque recovery system and achieve more accurate and efficient torque recovery.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an energy recovery system under four drive motors of a new energy vehicle. Each vehicle of the new energy vehicle is equipped with a wheel-side motor. All wheel-side motors are connected to a VCU and output a motor energy recovery capability signal to the VCU. The VCU outputs the energy recovery capability signal of each wheel-side motor to the ESP. The ESP outputs the braking torque signal of each wheel to the VCU. The VCU connects to and outputs a recovery torque execution signal to each corresponding wheel-side motor.

[0008] The ESP is connected to the CAN bus and receives input from the driver's brake pedal in real time.

[0009] The VCU connects to the vehicle's main unit via a CAN bus to obtain current weather information.

[0010] The VCU connects to the vehicle's main unit via a CAN bus to obtain current location information.

[0011] The VCU communicates with the wheel-side motor and ESP via CAN.

[0012] The wheel-side motors include a front left motor, a rear left motor, a front right motor, and a rear right motor.

[0013] The new energy vehicles mentioned are pure electric vehicles, hybrid vehicles, range-extended electric vehicles, or hydrogen fuel cell vehicles.

[0014] A new energy vehicle includes a vehicle body, wherein the vehicle body contains the energy recovery system.

[0015] The new energy vehicles mentioned are pure electric vehicles, hybrid vehicles, range-extended electric vehicles, or hydrogen fuel cell vehicles.

[0016] This invention enables more precise torque recovery control. The chassis ESP system calculates the required braking torque at the four drive wheels in real time, ensuring that high SOC and low SOC have the same energy recovery efficiency and deceleration feel, improving vehicle safety performance while being environmentally friendly and energy-saving. Attached Figure Description

[0017] The following is a brief explanation of the content represented by each of the accompanying drawings in this utility model specification:

[0018] Figure 1 This is a schematic diagram of an energy recovery system with four drive motors. Detailed Implementation

[0019] The following description, with reference to the accompanying drawings, details the specific implementation of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the function and working principle of each part, the manufacturing process, and the operation and use methods. This will help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of this utility model.

[0020] The energy recovery system under the four-wheel drive motor of the new energy vehicle is applicable to current new energy vehicles, such as pure electric vehicles, hybrid vehicles, range-extended vehicles or hydrogen fuel cell vehicles. The four-wheel drive new energy vehicle is driven by four wheel-side motors, which drive the four wheels respectively. When braking or coasting, the four wheel-side motors complete torque recovery. The core of this application is the independent control of the four wheel-side motors to ensure that the deceleration feel is the same at high and low SOC.

[0021] Therefore, all wheel-side motors are connected to the VCU and output a motor energy recovery capability signal to the VCU. The VCU outputs the energy recovery capability signal of each wheel-side motor to the ESP. The ESP outputs the braking torque signal of each wheel to the VCU. The VCU connects to and outputs the recovery torque execution signal to each corresponding wheel-side motor.

[0022] The entire system communicates via a CAN network, meaning the VCU communicates with the wheel-side motors and ESP through CAN. The ESP calculates the braking torque for each wheel in real time for either coasting energy recovery or braking energy recovery. The specific calculation is not covered by this application; any feasible braking torque control scheme can be used. The chassis ESP module receives real-time input from the driver's brake pedal and calculates the braking torque for each wheel based on the vehicle's current load, speed, and road conditions. The VCU receives the braking torque and motor recovery capability from the chassis ESP, calculates the recovery torque, and sends it to the wheel-side motors for execution. Simultaneously, the four motors transmit their recovery capability to the chassis ESP via the VCU. The chassis sends the arbitrated recovery torque from the drive motors to the VCU, which then sends the recovery torque command from each motor to the wheel-side motors. Each of the four motors independently achieves wheel-end torque.

[0023] The VCU of this system connects to the car's main unit via the CAN bus to obtain current weather and location information. The system can also use the current weather and location information as reference conditions for braking torque control, enabling more rational and intelligent control of the side wheel motors. For example, it can increase safety and improve braking performance in rainy or snowy weather.

[0024] The above system is controlled based on the existing vehicle infotainment system. By controlling each side wheel independently, it can improve the torque recovery capability of a single motor, realize precise calculation and control of the chassis system, and improve the response speed and accuracy of energy recovery.

[0025] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. An energy recovery system for a new energy vehicle with four drive motors, wherein each vehicle is equipped with a wheel-side motor, characterized in that: All wheel-side motors are connected to the VCU and output a motor energy recovery capability signal to the VCU. The VCU outputs the energy recovery capability signal of each wheel-side motor to the ESP. The ESP outputs the braking torque signal of each wheel to the VCU. The VCU connects to and outputs a recovery torque execution signal to each corresponding wheel-side motor.

2. The energy recovery system under the four-drive motor of the new energy vehicle according to claim 1, characterized in that: The ESP is connected to the CAN bus and receives input from the driver's brake pedal in real time.

3. The energy recovery system under the four-drive motor of the new energy vehicle according to claim 1 or 2, characterized in that: The VCU connects to the vehicle's main unit via a CAN bus to obtain current weather information.

4. The energy recovery system under the four-drive motor of the new energy vehicle according to claim 3, characterized in that: The VCU connects to the vehicle's main unit via a CAN bus to obtain current location information.

5. The energy recovery system under the four-wheel drive motor of the new energy vehicle according to claim 1, 2 or 4, characterized in that: The VCU communicates with the wheel-side motor and ESP via CAN.

6. The energy recovery system under the four-drive motor of the new energy vehicle according to claim 5, characterized in that: The wheel-side motors include a front left motor, a rear left motor, a front right motor, and a rear right motor.

7. The energy recovery system under the four-drive motor of the new energy vehicle according to claim 6, characterized in that: The new energy vehicle includes the vehicle body, and the new energy vehicle is a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, or a hydrogen fuel cell vehicle.

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