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EP-4458631-B1 - VEHICLE ACCELERATION CONTROL METHOD AND DEVICE, VEHICLE, AND STORAGE MEDIUM

EP4458631B1EP 4458631 B1EP4458631 B1EP 4458631B1EP-4458631-B1

Inventors

  • LIU, Shuai
  • ZHANG, BO

Dates

Publication Date
20260506
Application Date
20221220

Claims (14)

  1. An acceleration control method of a vehicle, the method comprising: (S101) acquiring a vehicle operating parameter; when the vehicle operating parameter satisfies a short-time power assistance activation condition: (S102) correcting a calibration output torque threshold based on an accelerator pedal opening degree and a vehicle mode to obtain a target calibration output torque threshold , the target calibration output torque threshold being obtained by adding a positive output-torque correction value selected from a preset table according to the accelerator pedal opening degree to the calibration output torque threshold; and (S103) correcting, in response to the activation condition, a calibration drive parameter based on an operating parameter of a drive component to obtain a target calibration drive parameter of the drive component, the target calibration drive parameter being obtained by adding a positive correction value or factor selected from a preset table according to the operating parameter to the calibration drive parameter, wherein the short-time power assistance activation condition comprises that an engine is started and an engine speed is within a calibration speed range, the operation states of an electric motor, the engine and a high-voltage battery are normal, a State of Charge, SOC, of the high-voltage battery is greater than a preset SOC, a difference between an actual discharge power of the battery and a maximum dynamic discharge power is greater than a preset discharge-power value, and a battery temperature and an electric-motor temperature are within preset temperature ranges.
  2. The acceleration control method of the vehicle according to claim 1, wherein correcting the calibration output torque threshold of the vehicle based on the accelerator pedal opening degree and the vehicle mode to obtain the target calibration output torque threshold comprises: (Step 1) acquiring the accelerator pedal opening degree and the current vehicle mode; (Step 2) determining the calibration output torque threshold corresponding to the accelerator pedal opening degree based on the current vehicle mode; (Step 3) determining a corresponding output torque corrected value based on the accelerator pedal opening degree; and (Step 4) calculating a sum of the output-torque corrected value and the calibration output torque threshold, to obtain the target calibration output torque threshold.
  3. The acceleration control method of the vehicle according to claim 1, wherein after correcting the calibration output torque threshold of the vehicle based on the accelerator pedal opening degree and the vehicle mode to obtain the target calibration output torque threshold, and before correcting the calibration drive parameter based on the operating parameter of the drive component to obtain the target calibration drive parameter of the drive component, the acceleration control method of the vehicle further comprises: limiting a power of a high-voltage component to a preset power value.
  4. The acceleration control method of the vehicle according to claim 3, wherein the high-voltage component comprises an air conditioner and a Direct current-Direct current, DCDC, converter; limiting the power of the high-voltage component to the preset power value comprises: setting an output power of the air conditioner to a lowest calibration gear corresponding to a lowest calibrated output level; calculating a calibrated charging power based on a SOC of a low-voltage battery on a low-voltage side of the DCDC converter, the calibrated charging power being a charging power calculated based on a minimum voltage electricity consumption of the low-voltage battery; and setting a charging power of the low-voltage battery to the calibrated charging power.
  5. The acceleration control method of the vehicle according to claim 1, wherein correcting the calibration drive parameter based on the operating parameter of the drive component to obtain the target calibration drive parameter of the drive component comprises: acquiring a dynamic discharge power of the battery; switching a discharge power of the battery to a calibration dynamic discharge power; acquiring a dynamic discharge power correction factor; and correcting the calibration dynamic discharge power by adding the dynamic discharge power correction factor selected from a preset table, to obtain a target calibration discharge power.
  6. The acceleration control method of the vehicle according to claim 5, wherein acquiring the dynamic discharge power correction factor comprises: acquiring a maximum temperature and a minimum temperature of the battery; calculating an average temperature of the battery according to the maximum temperature and the minimum temperature; and acquiring the SOC of the battery, and obtaining the corresponding dynamic discharge power correction factor by looking up a table according to the SOC and the average temperature.
  7. The acceleration control method of the vehicle according to claim 6, wherein the average temperature of the battery is calculated by following steps: obtaining a weighting factor corresponding to the minimum temperature by looking up a table according to the minimum temperature of the battery; calculating the average temperature of the battery according to HVBT=X*HVBLT+(1-X)*HVBHT; where HVBT represents the average temperature of the battery, HVBLT represents the minimum temperature of the battery, HVBHT represents the maximum temperature of the battery at current time, and X represents the weighting factor.
  8. The acceleration control method of the vehicle according to claim 1, wherein the short-time power assistance of the vehicle is divided into two stages; correcting the calibration drive parameter based on the operating parameter of the drive component to obtain the target calibration drive parameter of the drive component comprises: (Step A) acquiring a cooling water temperature, a controller temperature and a stator temperature of the electric motor; (Step B) determining a corresponding calibration drive torque by looking up a table according to the cooling water temperature; (Step C) in a first stage of the short-time power assistance, determining a corresponding first torque correction factor by looking up a table according to the controller temperature, and calculating a sum of the first torque correction factor and the calibration drive torque, to obtain a target calibration drive torque corresponding to the first stage; and (Step D) in a second stage of the short-time power assistance, determining a corresponding second torque correction factor by looking up a table according to the stator temperature, and calculating a sum of the second torque correction factor and the calibration drive torque, to obtain a target calibration drive torque corresponding to the second stage.
  9. The acceleration control method of the vehicle according to any one of claims 1-8, wherein acquiring the vehicle operating parameter comprises: detecting whether a driver has a short-time power assistance intention according to the vehicle operating parameter including at least one of: a position of a gear lever, a brake pedal opening degree, an electrical park brake system state, the accelerator pedal opening degree, a rate of change in the accelerator pedal opening degree, the vehicle mode, and a difference between a requesting torque and a calibration torque; and when it is detected that the driver has the short-time power assistance intention, detecting whether the vehicle operating parameter satisfies the short-time power assistance activation condition; and after the short-time power assistance activation condition is satisfied, setting a short-time power assistance activation flag bit, and entering a short-time power assistance mode.
  10. The acceleration control method of the vehicle according to claim 9, wherein the vehicle operating parameter for detecting whether the driver has a short-time power assistance intention further includes: the engine speed, the SOC of the battery, the actual discharge power of the battery, the battery temperature and the electric-motor temperature.
  11. The acceleration control method of the vehicle according to claim 9, wherein it is determined that the driver has the short-time power assistance intention when one or more of following conditions are satisfied: the gear lever is in a drive gear, the brake pedal opening degree is zero, the electrical park brake system is not enabled, the accelerator pedal opening degree is greater than a preset pedal opening degree, the rate of change in the accelerator pedal opening degree is greater than a preset rate of change, the vehicle mode is a preset mode, and the difference between the requesting torque and the calibration torque is less than a preset torque value.
  12. The acceleration control method of the vehicle according to any one of claims 1-8, wherein after correcting the calibration drive parameter based on the operating parameter of the drive component to obtain the target calibration drive parameter of the drive component, the acceleration control method of the vehicle further comprises: when the vehicle operating parameter satisfies a short-time power assistance exit condition, exiting a short-time power assistance mode.
  13. A vehicle, comprising an electronic device (5), the electronic device (5) comprising a memory (51), a processor (50), and a computer program (52) stored in the memory (51) and executable on the processor (50), wherein the processor (50), when executing the computer program (52), implements the steps of the acceleration control method of the vehicle according to any one of claims 1 to 12.
  14. A computer-readable storage medium, storing a computer program (52), wherein the computer program (52), when executed on a processor (50), implements the steps of the acceleration control method of the vehicle according to any one of claims 1 to 12.

Description

TECHNICAL FIELD The present invention relates to the technical field of vehicle power system, and particularly to an acceleration control method, a vehicle, and a storage medium. BACKGROUND In modern society, the large number of internal combustion locomotives has led to increasingly serious environmental pollution problems, and the fossil fuels they consume are non-renewable. This has made the application of hybrid vehicles increasingly widespread. The commonly referred hybrid vehicles generally refer to hybrid electric vehicles, which use electric motors and traditional internal combustion engines as power sources. Most hybrid vehicles use batteries as their onboard energy storage carrier. However, the existing batteries have a lower specific power, which limits the acceleration performance of the vehicle. The specific power can characterize the ability of a battery to release or absorb energy per unit time. The higher the specific power, the more energy the battery can release per unit time, and the better the acceleration performance of the vehicle. On the contrary, if the specific power is low, the energy that the battery can release per unit time is limited. Which cannot meet the instantaneous high-power requirement of the vehicle, resulting in poor acceleration performance of the vehicle. To solve this problem, the current common method is to increase the number of the batteries. However, this method will increase the cost and weight of the vehicle. US 2013/275023 A1 discloses a variable power drive mode system for a vehicle, including a pedal, a processor, an engine or other vehicle power source for moving the vehicle and a battery. The processor of the vehicle determines, either automatically or based upon user input, a desired drive mode for the vehicle. A memory connected with the processor stores different data corresponding to the different drive modes determinable by the processor for the vehicle. The processor uses the different data stored in memory in combination with a position of the pedal to control the engine or other vehicle power source to generate power in accordance with the determined drive mode. US 4 898 138 A discloses an engine control apparatus including an operation amount detection section for detecting an operation amount of an acceleration pedal, a throttle valve for adjusting an engine output, an arithmetic section for receiving the output from the operation amount detection section and calculating a control amount corresponding to the output operation amount of the acceleration pedal in accordance with a predetermined characteristic, the control amount being one for controlling the throttle valve, a motor for receiving the output from the arithmetic section and driving the throttle valve in accordance with the control amount calculated by the arithmetic section, a return detection section for detecting a return state of the acceleration pedal, and a control section for, when the return detection section detects the return state of the acceleration pedal, controlling the arithmetic section to output the control amount in accordance with a characteristic with which the engine output is decreased below that according to the predetermined characteristic. US 2008/306670 A1 discloses a power boost system and method for temporarily boosting power available to a vehicle having a vehicle engine and accessories, wherein an operator interface has a system activation button; a vehicle system controller is connected to the operator interface; the accessories are connected to the vehicle system controller; and at least the operation of the accessories is suppressed by operation of the operator interface. SUMMARY It is an object of the present invention to provide an acceleration control method, a vehicle, and a storage medium, to solve a technical problem of poor short-time acceleration capability in existing pure electric or hybrid electric vehicles. The object is achieved by the features of independent claim 1 regarding the acceleration control method, of independent claim 13 regarding the vehicle, and of independent claim 14 regarding the storage medium. The present invention has the following advantages: In the acceleration control method of the vehicle provided by the present invention, it is determined whether the vehicle satisfies the short-time power assistance activation condition according to the vehicle operating parameter, and after entering the short-time power assistance mode, the driving capability of the entire vehicle can be improved. That is, the upper limit of the calibration output torque of the entire vehicle is improved, the discharge power and drive torque of the drive component is improved, and the upper limit of the calibration drive parameter of the drive component is improved, so that the torque request of the driver is responded to within the corresponding controllable output torque range, and will not be unable to obtain the response of the corresponding ou