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CN-122029087-A - Method for controlling a parking brake of a vehicle

CN122029087ACN 122029087 ACN122029087 ACN 122029087ACN-122029087-A

Abstract

Method for controlling a parking brake of a vehicle, which parking brake is configured to clamp a friction device on a braking element, comprising the steps of-detecting (22) a request to clamp the brake, -determining a target clamping force value enabling the vehicle to remain stationary in dependence of a parking condition of the vehicle, -actuating the brake to provide a clamping force corresponding to said target value, characterized in that the step of determining the target clamping force value comprises the steps of-determining a first clamping force value enabling the vehicle to remain stationary indefinitely even after the brake is relaxed, -verifying (23) if the driver is located on the driver's seat of the vehicle, -using a second clamping force value strictly smaller than the first clamping force value as (24) the target clamping force value if the driver is located on the driver's seat, -otherwise using the first clamping force value as (25) the target clamping force value.

Inventors

  • Julian Sasso
  • WANG WEIQIAO
  • Alex Patrand Kakaro
  • Maxim de Mundell

Assignees

  • 安斯泰莫法国公司
  • 安斯泰莫海尔布隆有限公司

Dates

Publication Date
20260512
Application Date
20240715
Priority Date
20231006

Claims (8)

  1. 1. A method for controlling a vehicle parking brake configured to clamp a friction device (14) on a brake member (10, 12), the method comprising the steps of: -detecting (22) a clamping brake request, Determining a target clamping force value that enables the vehicle to remain stationary, depending on the parking conditions of the vehicle (1), Actuating a brake to provide a clamping force corresponding to said target value, Wherein the step of determining the target clamping force value comprises the steps of: Determining a first clamping force value which enables the vehicle to remain stationary indefinitely even after brake release, Verifying (23) whether the driver is located on the driver's seat of the vehicle (1), Using (24) a second clamping force value, which is strictly smaller than the first clamping force value, as a target clamping force value in the case of a driver on the driver's seat, -Otherwise, using (25) the first clamping force value as the target clamping force value.
  2. 2. Braking method according to the preceding claim, wherein the parking conditions of the vehicle (1) comprise at least the gradient (2) of the road on which the vehicle (1) is located and the temperature of the friction means (14) and/or the friction members (10, 12).
  3. 3. A braking method according to any one of the preceding claims, wherein the difference between the second clamping force value and the first clamping force value is between x% and y% of the first clamping force value, preferably at least X1%.
  4. 4. A braking method according to any one of the preceding claims, wherein the step of verifying (23) whether the driver is located on the driver's seat is performed continuously.
  5. 5. Braking method according to any one of the preceding claims, wherein the verification (25) of whether the driver is located on the driver's seat is effected on the basis of a signal based on at least one of the following criteria: a. Detecting whether the vehicle (1) has been powered on, B. detecting an open or closed state of the driver side door, C. a visual inspection of the driver is performed, D. it is detected whether the driver side seatbelt is locked, E. detecting whether there is a weight on the driver side seat, F. Detecting whether there is an effort on the accelerator pedal and/or the brake pedal.
  6. 6. Braking method according to the preceding claim, wherein the signal is the PbcInDriveAwayIntentionIndication signal from the german automotive industry association's vda-100 v3v2018 proposal.
  7. 7. A digital computer (20) comprising a memory and a processor connected to the memory, characterized in that the memory contains a series of instructions which, when executed by the processor, implement the method according to any of claims 1 to 6.
  8. 8. A storage medium containing a series of instructions for implementing the method of any one of claims 1 to 6.

Description

Method for controlling a parking brake of a vehicle The present invention relates to a method for controlling a parking brake (also referred to as parking brake) of a motor vehicle. The brake generally includes a friction device and an actuating member (also referred to as an actuator) that is capable of moving the friction device toward a braking member fixed to a wheel of the vehicle. The purpose of the actuator is to bring friction means, such as friction plates of a drum brake or brake pads of a disc brake, into contact with the brake member in order to brake the vehicle by friction and to move them away from the brake member in order to stop the braking. When the brake system is a disc brake, the brake member is formed by a disc that rotates integrally with the wheel. In the case of a drum brake, the brake member is formed of a drum that rotates integrally with the wheel. The parking brake is constituted by a combination of friction means and an actuator which can be controlled during non-driving phases of the vehicle in order to lock at least part of the wheels, typically the rear wheels, by means of the friction means, thereby keeping the vehicle stationary. For many years, actuators have been mechanically constructed. Today, it has evolved into electric motors, including motors and their electronic controls, which bring about a number of advantages. First, a parking brake having an electric actuator is smaller in volume than a mechanical parking brake. Furthermore, a parking brake with an electric actuator can be used not only for parking but also as a backup for dynamic braking during driving of the vehicle. The operation of the electric parking brake is also simpler for the vehicle user. When the user wishes to stop the vehicle, the command for the brake clamping need only be issued, either explicitly (for example by pressing a button) or implicitly, for example by detecting a zero speed and stopping the engine. Instead, to restart the vehicle, the user simply releases the electric park brake, which command may likewise be explicit (e.g., pressing a button), or implicit, e.g., depressing the throttle and engaging gear. When used as a parking brake, the electric actuator is preset according to the weight of the vehicle and possibly the gradient of the road surface on which it is located, etc., to ensure that the position of the vehicle is kept fixed in any situation. Clamping may take into account, in particular, a temperature drop of the brake after the vehicle has stopped, since this temperature drop is known to lead to a loosening of the clamping force. In order to eliminate the risk that the clamping force becomes too small to prevent an unexpected movement of the vehicle, the brake is clamped with a clamping force exceeding the strictly necessary value, leaving a safety margin such that the relaxation of the initial clamping force over time does not drop it below the minimum clamping force required to hold the vehicle. One disadvantage of such preconditioned clamping is that it is often excessive, especially when the vehicle is parked for only a few seconds, for example in a red light on a road or the like. The inventors studied the influence of such excessive clamping force. They found that this resulted in premature wear of the brakes and significant energy over-consumption. Of course, safety must be paramount, but the present invention aims to solve the problems of premature wear and excessive energy consumption, without reducing the safety of the parking brake function. Furthermore, the use of excessive clamping force also increases the time required to release the brake when the vehicle is restarted. Such longer response times may create a jerk, affect passenger comfort, and present an inconvenience to the driver because the driver may desire a faster response speed for the vehicle. To this end, the subject of the invention is a method for controlling a vehicle parking brake configured to clamp a friction device on a brake member, comprising the steps of: -detecting a request for clamping the brake, Determining a target clamping force value that enables the vehicle to remain stationary, depending on the parking conditions of the vehicle, Actuating a brake to provide a clamping force corresponding to said target value, Wherein the step of determining the target clamping force value comprises the steps of: Determining a first clamping force value which enables the vehicle to remain stationary indefinitely even after brake release, Verifying whether the driver is located on the driver's seat of the vehicle, Using a second clamping force value, which is strictly smaller than the first clamping force value, as a target clamping force value in the case of a driver situated on his driver's seat, -Otherwise, using the first clamping force value as the target clamping force value. Thereby, the clamping force of the parking brake can be reduced when the driver is in the vehicle. In this way, too hi