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CN-121989900-A - Control method and device for vehicle, vehicle and storage medium

CN121989900ACN 121989900 ACN121989900 ACN 121989900ACN-121989900-A

Abstract

The application provides a control method and device of a vehicle, the vehicle and a storage medium, wherein the method is applied to the field of vehicle brake control, and comprises the following steps: based on the current state sensing parameters of the vehicle, judging whether a water film exists on the surface of a brake disc of the vehicle, determining a target brake pressure for executing the water film cleaning operation under the condition that the water film exists on the surface of the brake disc and the preset execution condition of the water film cleaning operation is met, and controlling a brake system of the vehicle based on the target brake pressure so as to clean the water film on the surface of the brake disc. The method can identify the condition that the water film exists on the surface of the brake disc in advance in the running process of the vehicle, so that the water film on the surface of the brake disc is actively cleared through a brake system of the vehicle, the dry friction state between the brake disc and a brake pad is ensured, and the rapid recovery and the stabilization of the braking performance of the vehicle are facilitated.

Inventors

  • ZHANG CHAO

Assignees

  • 长城汽车股份有限公司

Dates

Publication Date
20260508
Application Date
20260318

Claims (10)

  1. 1. A control method of a vehicle, characterized by comprising: Judging whether a water film exists on the surface of a brake disc of a vehicle or not based on current state sensing parameters of the vehicle; Determining a target brake pressure for executing the water film cleaning operation under the condition that the surface of the brake disc is determined to have the water film and the preset execution condition of the water film cleaning operation is met; And controlling a braking system of the vehicle based on the target braking pressure to clear a water film on a surface of the brake disc.
  2. 2. The method of claim 1, wherein the determining a target brake pressure for performing the water film removal operation comprises: Calculating a temperature difference value of the predicted temperature of the brake disc minus the current environmental temperature, and determining a target risk coefficient based on the temperature difference value, wherein the target risk coefficient is used for representing the risk degree of a water film existing on the surface of the brake disc; And correcting the basic brake pressure of the brake disc based on the target risk coefficient to obtain the target brake pressure.
  3. 3. The method of claim 1, wherein the determining a target brake pressure for performing the water film removal operation comprises: acquiring the current speed of the vehicle; Calculating a temperature difference value of the predicted temperature of the brake disc minus the current ambient temperature; the target brake pressure is determined based on the current vehicle speed and the temperature difference.
  4. 4. The method according to claim 1, wherein the method further comprises: Under the condition that an execution instruction of the water film cleaning operation is received, acquiring the current speed of the vehicle, the current opening of a brake pedal, the current opening of an accelerator pedal and the interval duration from the last execution of the water film cleaning operation; And determining that the preset execution condition of the water film cleaning operation is met under the conditions that the current vehicle speed is greater than the preset vehicle speed, the current opening of the brake pedal is smaller than the first preset opening, the current opening of the accelerator pedal is smaller than the second preset opening and the interval time is longer than the preset time length.
  5. 5. The method of claim 1, wherein determining whether a water film is present on a surface of a brake disc of the vehicle based on a current state sensing parameter of the vehicle comprises: acquiring current state sensing parameters of the vehicle under the condition that the surface of the brake disc is determined to have a water film adhesion risk; and judging whether a water film exists on the surface of the brake disc or not based on the state sensing parameters.
  6. 6. The method of claim 5, wherein the state-sensing parameters include a current ambient temperature and a predicted temperature of the brake disc, and wherein determining whether a water film is present on a surface of the brake disc based on the state-sensing parameters comprises: Calculating a temperature difference of the predicted temperature of the brake disc minus the current ambient temperature; And under the condition that the temperature difference value is smaller than or equal to a preset temperature threshold value, determining that a water film exists on the surface of the brake disc.
  7. 7. Method according to any one of claims 1 to 6, characterized in that the state-sensing parameter comprises a predicted temperature of the brake disc, which is obtained by: acquiring a current speed of the vehicle, a current temperature of the brake disc, a current deceleration of the vehicle, a duration when a current opening of a brake pedal of the vehicle is larger than a third preset opening, and a current environmental temperature of the vehicle; a predicted temperature of the brake disc is determined based on the current vehicle speed, the current temperature of the brake disc, the current deceleration, the duration, and the current ambient temperature.
  8. 8. A control device of a vehicle, characterized by comprising: the judging module is used for judging whether a water film exists on the surface of a brake disc of the vehicle or not based on the current state sensing parameters of the vehicle; a determining module, configured to determine a target brake pressure for executing a water film cleaning operation if it is determined that a water film exists on a surface of the brake disc and a preset execution condition of the water film cleaning operation is satisfied; and the control module is used for controlling a braking system of the vehicle based on the target braking pressure so as to clear the water film on the surface of the brake disc.
  9. 9. A vehicle, characterized in that the vehicle comprises: A memory for storing executable program code; a processor for calling and running the executable program code from the memory, causing the vehicle to perform the method of any one of claims 1 to 7.
  10. 10. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed, implements the method according to any of claims 1 to 7.

Description

Control method and device for vehicle, vehicle and storage medium Technical Field The present application relates to the field of vehicle brake control, and more particularly, to a control method, apparatus, vehicle, and storage medium of a vehicle in the field of vehicle brake control. Background After the vehicle runs in a rainy day or is cleaned, a water film is extremely easy to adhere to the surface of the brake disc, and a lubrication isolation layer is formed between the brake pad and the brake disc by the water film, so that the friction coefficient is obviously reduced, and further the problems of braking efficiency attenuation (commonly called as 'braking softening') and braking distance extension and the like of the vehicle during first braking are caused, so that potential safety hazards exist. The traditional scheme generally relies on a driver to actively tread a brake pedal after wading to evaporate water on a brake disc, but the operation is highly dependent on driving experience, so that timeliness and reliability are difficult to ensure, and although some vehicles adopt a preset light braking strategy based on fixed conditions or timing triggering, the control lacks sensing and adaptability to actual working conditions, and excessive or insufficient braking intervention is easily caused. Disclosure of Invention The application provides a control method, a device, a vehicle and a storage medium of a vehicle, wherein the method can identify the condition that a water film exists on the surface of a brake disc in advance in the running process of the vehicle, so that the water film on the surface of the brake disc is actively cleared through a brake system of the vehicle, the dry friction state between the brake disc and a brake pad is ensured, and the quick recovery and the stabilization of the braking performance of the vehicle are facilitated. In a first aspect, a control method of a vehicle is provided, the method including judging whether a water film exists on a surface of a brake disc of the vehicle based on a current state sensing parameter of the vehicle, determining a target brake pressure for executing a water film cleaning operation in a case that it is determined that the water film exists on the surface of the brake disc and a preset execution condition of the water film cleaning operation is satisfied, and controlling a brake system of the vehicle based on the target brake pressure to clean the water film on the surface of the brake disc. According to the technical scheme, whether the water film exists on the surface of the brake disc or not can be accurately judged through the current state sensing parameters of the vehicle, hidden dangers affecting braking effects such as wading and water accumulation of the brake disc can be actively and early identified in the running process of the vehicle, safety risks such as braking force reduction and braking distance extension caused by the water film covered on the surface of the brake disc are avoided, when the water film exists on the surface of the brake disc and preset execution conditions of water film clearing operation are met, target braking force for executing the water film clearing operation can be firstly determined, and the brake system is controlled to output the target braking force so as to clear the water film on the surface of the brake disc, the operation of a driver is not needed, the water film on the surface of the brake disc can be actively cleared through the brake system of the vehicle, the dry friction state between the brake disc and the brake pad is guaranteed, rapid recovery and stabilization of the vehicle are facilitated, and braking safety and running stability of the vehicle under wet running and water-involved working conditions are further improved. With reference to the first aspect, in certain implementation manners of the first aspect, determining a target brake pressure for performing a water film cleaning operation includes calculating a temperature difference of a predicted temperature of a brake disc minus a current ambient temperature, and determining a target risk coefficient based on the temperature difference, wherein the target risk coefficient is used for representing a risk degree of a water film existing on a surface of the brake disc, and correcting a base brake pressure of the brake disc based on the target risk coefficient to obtain the target brake pressure. According to the technical scheme, the temperature difference between the predicted temperature of the brake disc and the current environment temperature is calculated, the target risk coefficient used for representing the water film risk degree on the surface of the brake disc is determined based on the temperature difference, and then the basic brake pressure of the brake disc is corrected according to the target risk coefficient to obtain the target brake pressure, so that the magnitude of the target brake pressure is match