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CN-122008883-A - Electric vehicle energy feedback control method capable of actively identifying charging faults and electric vehicle

CN122008883ACN 122008883 ACN122008883 ACN 122008883ACN-122008883-A

Abstract

The invention discloses an electric vehicle energy feedback control method capable of actively identifying a charging fault and an electric vehicle, and relates to the field of electric vehicle energy feedback control, wherein a controller in the electric vehicle controls whether an electric vehicle power system enters an energy feedback mode according to the working condition of the electric vehicle; the controller controls the electric vehicle power system to enter an energy feedback mode, the controller performs detection initialization, the detection initialization comprises limiting the direct current bus current to a safety value and constructing a detection window, in the detection window, the controller judges whether a charging loop of a battery is faulty according to the direct current bus voltage, when judging that the charging loop is faulty, the controller controls the electric vehicle power system to exit the energy feedback mode, when judging that the charging loop is normal, the direct current bus current limitation is released, and the electric vehicle power system is controlled to normally perform energy feedback. The control method can realize the fault identification of the charging loop without communication dependence and balance the safety and the energy recovery benefit.

Inventors

  • YU JIANGJIANG

Assignees

  • 无锡九通电子技术有限公司

Dates

Publication Date
20260512
Application Date
20260319

Claims (10)

  1. 1. An electric vehicle energy feedback control method for actively identifying a charging fault is characterized in that a controller in an electric vehicle controls whether an electric vehicle power system enters an energy feedback mode according to the working condition of the electric vehicle; After the controller controls the electric vehicle power system to enter an energy feedback mode, the controller performs detection initialization, wherein the detection initialization comprises limiting the direct current bus current to a safety value and constructing a detection window; And in the detection window, the controller judges whether a charging loop of the battery is faulty according to the voltage of the direct-current bus, controls the electric vehicle power system to exit the energy feedback mode when judging that the charging loop is faulty, releases the current limit of the direct-current bus when judging that the charging loop is normal, and controls the electric vehicle power system to normally perform energy feedback.
  2. 2. The method for controlling energy feedback of an electric vehicle for actively recognizing a charging failure according to claim 1, wherein the controller periodically performs an interrupt detection task within the detection window, the interrupt detection task comprising: And sampling the DC bus voltage in real time and comparing the DC bus voltage with a fault voltage threshold value vdc_Th, or sampling the DC bus voltage in real time, subtracting the DC bus voltage sampled by the current interrupt detection task from the DC bus voltage sampled by the last interrupt detection task to obtain a DC bus voltage variation value vdc_Delta, and comparing the DC bus voltage variation value with the fault voltage variation threshold value vdc_Delta_Th.
  3. 3. The method according to claim 2, wherein the controller determines that the charging loop is faulty if the dc bus voltage sampled in the interrupt detection tasks for N consecutive times is greater than the fault voltage threshold vdc_th or the dc bus voltage change value vdc_delta calculated in the interrupt detection tasks for N consecutive times is greater than the fault voltage change threshold vdc_delta_th within the detection window.
  4. 4. The method for controlling energy feedback of an electric vehicle for actively recognizing a charging failure according to claim 2, wherein the controller periodically performs a working condition detection task, the working condition detection task includes determining whether an electric vehicle working condition satisfies an energy feedback condition, and controlling the electric vehicle power system to enter an energy feedback mode when the electric vehicle working condition satisfies the energy feedback condition.
  5. 5. The method for actively recognizing a charging failure according to claim 4, wherein the execution period of the condition detection task is greater than the interrupt period of the interrupt detection task.
  6. 6. The method for controlling energy feedback of an electric vehicle for actively recognizing a charging failure according to claim 1, wherein after the electric vehicle power system enters an energy feedback mode, the controller performs voltage-current double-loop control according to a direct current bus current and a direct current bus voltage to generate a torque Limit value te_limit, obtains a torque given value te_act according to the torque Limit value te_limit and a basic feedback torque te_ref, and uses the torque given value te_act as feedback torque of a motor in the electric vehicle power system.
  7. 7. The method for actively recognizing a charging failure of an electric vehicle according to claim 6, wherein the voltage-current double-loop control comprises a voltage limiting loop control and a current limiting loop control, wherein the voltage limiting loop control generates a voltage limiting loop output value IPI1 according to a direct current bus voltage and a direct current bus voltage limiting value vdc_Limit, the current limiting loop control generates a current limiting loop reference value I_Ref according to the voltage limiting loop output value IPI1 and a direct current bus current limiting value idc_Limit, and generates a torque limiting value Te_Limit according to the current limiting loop reference value I_Ref and the direct current bus current; When the controller performs detection initialization, the direct current bus current is limited to a safe value by setting the direct current bus current Limit value idc_limit in the current limiting ring control as a safe direct current bus current Limit value idc_limit_min; When the controller releases the direct current bus current Limit, the controller sets a direct current bus current Limit value idc_limit in the current Limit loop control as a normal direct current bus current Limit value idc_limit_normal, wherein the normal direct current bus current Limit value idc_limit_normal is greater than the safe direct current bus current Limit value idc_limit_min.
  8. 8. The method of claim 7, wherein the controller controls the electric vehicle power system to exit the energy feedback mode, and comprises zeroing the torque setpoint te_act and the dc bus current Limit idc_limit.
  9. 9. The method of claim 4, wherein the energy feedback condition includes the electric vehicle being in an electric braking state or a steep descent state, wherein, When the electric vehicle runs forward, the electric vehicle is in an electronic braking state when a braking signal of the electric vehicle is effective or a braking signal and an accelerator signal of the electric vehicle are simultaneously ineffective; when the electric vehicle runs forward, the brake signal and the accelerator signal of the electric vehicle are invalid at the same time, and when the speed of the electric vehicle is increased, the electric vehicle is in a steep slope slowly-descending state.
  10. 10. An electric vehicle, characterized in that the electric vehicle adopts the electric vehicle energy feedback control method for actively identifying a charging failure according to any one of the claims 1-9.

Description

Electric vehicle energy feedback control method capable of actively identifying charging faults and electric vehicle Technical Field The invention relates to the technical field of energy feedback control, in particular to an electric vehicle energy feedback control method capable of actively identifying a charging fault and an electric vehicle. Background In the field of electric two-wheeled vehicles, particularly for high-strength use scenes such as take-out distribution, express transportation and the like, a power conversion mode has become a mainstream solution due to convenience. In order to ensure the universality, the battery pack for changing the electricity generally adopts a standardized interface, and the interface only comprises the positive electrode and the negative electrode of a power supply and is not provided with a communication link. This results in information isolation between the motor controller and the battery pack, and the controller cannot know the internal critical state of the battery, and in particular cannot determine whether the charging MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is turned on, and the charging MOSFET (Metal-Oxide-semiconductor field effect transistor) is connected between the dc bus and the battery pack. Therefore, when the motor of the electric vehicle is in an energy feedback (power generation) state, if a charging MOSFET of the battery is just closed, feedback energy cannot be absorbed by the battery, but is fully injected into a direct current bus capacitor of the controller, so that the direct current bus voltage is rapidly raised (namely, pumping voltage), and overvoltage damage of a power device is easily caused. Currently, common strategies within the electronic control industry to deal with this risk mainly include: (1) And in the passive discharging scheme, redundant energy is consumed through a brake resistor, namely, redundant electric energy is converted into heat energy through the brake resistor when a battery charging circuit fails. However, this method has a large heat dissipation pressure, a limited response capacity, difficulty in continuously coping with high power feedback, and difficulty in layout on a compact electric two-wheeled vehicle. (2) The 'one-cut' prohibition scheme is that the energy feedback function is directly disabled when no communication exists between the motor controller and the battery pack. Although the overvoltage risk is avoided, most of batteries with normal charging functions cannot recover energy, vehicle endurance mileage and user braking experience are obviously sacrificed, and product competitiveness is seriously weakened in a power change scene with emphasized efficiency. As can be seen from the above description, when no communication exists between the motor controller and the battery, the common strategies of bus voltage overvoltage risk in the energy feedback process have obvious defects in the electric control industry, so that an energy feedback control method which does not depend on battery communication and can actively identify the charging state and perform safety control is urgently needed, so that the energy recovery benefit is reserved to the greatest extent on the premise of ensuring the absolute safety of the system, and the reliability and user experience of the whole vehicle in the no-battery communication state are improved. Disclosure of Invention The present inventors have provided an electric vehicle energy feedback control method and an electric vehicle for actively identifying a charging failure, aiming at the above problems and technical needs, and the technical scheme of the present invention is as follows: the electric vehicle energy feedback control method for actively identifying the charging fault comprises that a controller in the electric vehicle controls whether an electric vehicle power system enters an energy feedback mode according to the working condition of the electric vehicle; After the controller controls the electric vehicle power system to enter an energy feedback mode, the controller performs detection initialization, wherein the detection initialization comprises limiting the direct current bus current to a safety value and constructing a detection window; And in the detection window, the controller judges whether a charging loop of the battery is faulty according to the voltage of the direct-current bus, controls the electric vehicle power system to exit the energy feedback mode when judging that the charging loop is faulty, releases the current limit of the direct-current bus when judging that the charging loop is normal, and controls the electric vehicle power system to normally perform energy feedback. In a further technical scheme, in the detection window, the controller periodically executes an interrupt detection task, wherein the interrupt detection task comprises: And sampling the DC bus voltage in real time and comparing the DC bus volta