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CN-122008882-A - Electric vehicle kinetic energy recovery control system, method and device and whole vehicle controller

CN122008882ACN 122008882 ACN122008882 ACN 122008882ACN-122008882-A

Abstract

The application relates to a kinetic energy recovery control system, method and device for an electric vehicle and a whole vehicle controller. The system comprises a vehicle controller, a battery management system, a motor control unit and a controllable energy consumption load unit, wherein the controllable energy consumption load unit is connected in parallel with a direct current bus between the battery management system and the motor control unit, the vehicle controller is used for acquiring current recovery power of a driving motor based on the motor control unit and acquiring current maximum receiving power of a power battery based on the battery management system under a kinetic energy recovery working condition, comparing the current recovery power with the current maximum receiving power, and controlling the controllable energy consumption load unit to be connected into and at least partially consume excessive power if the current recovery power is larger than the current maximum receiving power. The system can solve the problem of abrupt change of braking force caused by cutting off or limiting recovery due to full charge of the battery in the traditional kinetic energy recovery scheme, ensure braking consistency and improve vehicle running stability and operation safety.

Inventors

  • ZHANG CHAO
  • DAI ZHEN
  • GU LIJUAN

Assignees

  • 湖南中联重科智能高空作业机械有限公司

Dates

Publication Date
20260512
Application Date
20260306

Claims (13)

  1. 1. The electric vehicle kinetic energy recovery control system is characterized by comprising a whole vehicle controller, a battery management system, a motor control unit and a controllable energy consumption load unit, wherein the battery management system, the motor control unit and the controllable energy consumption load unit are respectively in communication connection with the whole vehicle controller, and the controllable energy consumption load unit is connected in parallel on a direct current bus between the battery management system and the motor control unit; The whole vehicle controller is used for acquiring the current recovery power of the driving motor based on the motor control unit and acquiring the current maximum receiving power of the power battery based on the battery management system under the kinetic energy recovery working condition; Comparing the current recovered power with the current maximum received power; and if the current recovered power is larger than the current maximum received power, controlling the controllable energy consumption load unit to access and at least partially consume the power exceeding the current maximum received power.
  2. 2. The system of claim 1, wherein the vehicle controller is further configured to, prior to obtaining a current maximum received power of the power battery, obtain a current state of charge value of the power battery based on the battery management system, and determine that a condition that the current state of charge value is greater than or equal to a first threshold and less than a second threshold is met.
  3. 3. The system of claim 2, wherein the vehicle controller is further configured to: Controlling the current recovered power to be fully recharged to the power battery under the condition that the current state of charge value is smaller than the first threshold value; And/or controlling the current recovered power to be entirely consumed by the controllable energy consumption load unit under the condition that the current state of charge value is greater than or equal to the second threshold value.
  4. 4. A system according to any one of claims 1 to 3, wherein if the current recovered power is greater than the current maximum received power, the vehicle controller is further configured to control the power consumption of the controllable energy-consuming load unit to be equal to the difference between the current recovered power and the current maximum received power.
  5. 5. A system according to any one of claims 1 to 3, wherein the controllable energy consuming load unit comprises a programmable electronic load, or a combined load consisting of a plurality of parallel fixed power resistors and their switching switches; the rated power of the programmable electronic load and the combined load are each configured to be equal to or greater than a maximum brake recovery power of the electric vehicle.
  6. 6. The method is characterized by being applied to a whole vehicle controller and comprising the following steps of: Under the working condition of kinetic energy recovery, the current recovery power of the driving motor and the current maximum receiving power of the power battery are obtained; Comparing the current recovered power with the current maximum received power; if the current recovered power is greater than the current maximum received power, controlling the controllable energy consumption load unit to be connected so as to at least partially consume the power exceeding the current maximum received power; wherein the controllable energy consumption load unit is connected in parallel on a direct current bus between the battery management system and the motor control unit, and the battery management system, the motor control unit and the controllable energy consumption load unit are all in communication connection with the whole vehicle controller.
  7. 7. The method of claim 6, further comprising, prior to the step of obtaining the current maximum received power of the power cell: Acquiring a current state of charge value of the power battery; And determining that the condition that the current state of charge value is greater than or equal to a first threshold value and less than a second threshold value is met.
  8. 8. The method as recited in claim 7, further comprising: Controlling the current recovered power to be fully recharged to the power battery under the condition that the current state of charge value is smaller than the first threshold value; And/or controlling the current recovered power to be entirely consumed by the controllable energy consumption load unit under the condition that the current state of charge value is greater than or equal to the second threshold value.
  9. 9. The method according to any of claims 6 to 8, characterized by controlling the power consumption of the controllable energy consuming load unit to be equal to the difference between the current recovered power and the current maximum received power if the current recovered power is larger than the current maximum received power.
  10. 10. The utility model provides an electric vehicle kinetic energy recovery controlling means which characterized in that is applied to whole car controller, includes: The first acquisition module is used for acquiring the current recovery power of the driving motor under the kinetic energy recovery working condition; the second acquisition module is used for acquiring the current maximum receiving power of the power battery under the working condition of kinetic energy recovery; the judging module is used for comparing the current recovered power with the current maximum received power; The control module is used for controlling the controllable energy consumption load unit to be connected to at least partially consume the power exceeding the current maximum receiving power if the current recovered power is larger than the current maximum receiving power; wherein the controllable energy consumption load unit is connected in parallel on a direct current bus between the battery management system and the motor control unit, and the battery management system, the motor control unit and the controllable energy consumption load unit are all in communication connection with the whole vehicle controller.
  11. 11. A vehicle control unit comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method according to any one of claims 6 to 9 when executing the computer program.
  12. 12. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 6 to 9.
  13. 13. An electric vehicle, characterized by being equipped with the system according to any one of claims 1 to 5, the apparatus according to claim 10, or the vehicle control unit according to claim 11.

Description

Electric vehicle kinetic energy recovery control system, method and device and whole vehicle controller Technical Field The application relates to the technical field of electric vehicle control, in particular to an electric vehicle kinetic energy recovery control system, an electric vehicle kinetic energy recovery control method, an electric vehicle kinetic energy recovery control device, a whole vehicle controller, a computer readable storage medium and an electric vehicle. Background Electric vehicles (such as electric forklifts) influence the cruising performance due to the limitation of battery energy density and charging efficiency, and a kinetic energy recovery technology is one of key technologies for improving the cruising capability of the electric vehicles and reducing energy consumption. The basic principle of the kinetic energy recovery technology is that when an electric vehicle decelerates, descends or brakes, a driving motor is converted into a generator, and the kinetic energy of the vehicle is converted into electric energy to be charged back into a power battery. The current mainstream kinetic energy recovery control mode is that a driver sets intensity level (such as strong, medium and weak three-gear) of fixed kinetic energy recovery, when a power battery has enough capacity to receive recovered electric energy, a whole vehicle controller controls a motor to recover according to the recovery intensity set by the driver, and when a battery management system detects that the state of charge of the battery is higher than a certain preset threshold value, the system directly cuts off or greatly limits the kinetic energy recovery function in order to avoid battery overcharge. The control mode can lead to the failure of the kinetic energy recovery function or the great weakening of the effect in the initial driving process after the battery is fully charged, so that a driver can obviously feel that the braking force is suddenly softened during deceleration, and the familiar deceleration sense is lost. Especially, during the operation of a slope, abrupt braking force can lead to the vehicle to slide on the slope or even run away, and serious potential safety hazards exist. Therefore, on the premise of ensuring the safety of the battery, the consistency of braking torque under different charge states is maintained, and the running stability and safety of the vehicle are improved. Disclosure of Invention In view of the foregoing, it is desirable to provide an electric vehicle kinetic energy recovery control system, an electric vehicle kinetic energy recovery control method, an electric vehicle kinetic energy recovery control device, a vehicle controller, a computer-readable storage medium, and an electric vehicle. In a first aspect, an embodiment of the present application provides an electric vehicle kinetic energy recovery control system, including a vehicle control unit, and a battery management system, a motor control unit, and a controllable energy consumption load unit that are respectively connected with the vehicle control unit in a communication manner, where the controllable energy consumption load unit is connected in parallel to a direct current bus between the battery management system and the motor control unit; The whole vehicle controller is used for acquiring the current recovery power of the driving motor based on the motor control unit and acquiring the current maximum receiving power of the power battery based on the battery management system under the kinetic energy recovery working condition; Comparing the current recovered power with the current maximum received power; and if the current recovered power is larger than the current maximum received power, controlling the controllable energy consumption load unit to access and at least partially consume the power exceeding the current maximum received power. In one embodiment, before obtaining the current maximum received power of the power battery, the whole vehicle controller is further configured to obtain a current state of charge value of the power battery based on the battery management system, and determine that a condition that the current state of charge value is greater than or equal to a first threshold and less than a second threshold is satisfied. In one embodiment, the vehicle controller is further configured to: Controlling the current recovered power to be fully recharged to the power battery under the condition that the current state of charge value is smaller than the first threshold value; And/or controlling the current recovered power to be entirely consumed by the controllable energy consumption load unit under the condition that the current state of charge value is greater than or equal to the second threshold value. In one embodiment, if the current recovered power is greater than the current maximum received power, the whole vehicle controller is further configured to control the power consumption of t