US-12617381-B2 - Braking system including at least one parking brake

US12617381B2US 12617381 B2US12617381 B2US 12617381B2US-12617381-B2

Abstract

A motor vehicle braking system including at least one electrically actuated parking brake (FP) to be positioned at a wheel, a control unit (UC) configured for generating a command for the parking brake (FP) to apply parking braking or to interrupt the application of parking braking at a first intensity following a first request, wherein the control unit (UC) is also configured for generating a command for the parking brake (FP) to apply parking braking at a second intensity in response to a second request issued after the first request.

Inventors

Julien SASSO
Maxime DEMANDRE
Weiqiao WANG
ALEX PATRAO CARQUEIJO

Assignees

HITACHI ASTEMO FRANCE
HITACHI ASTEMO HEILBRONN GMBH

Dates

Publication Date: 20260505
Application Date: 20230928
Priority Date: 20220928

Claims (10)

1 . A braking system for a motor vehicle on a parking space, the vehicle including at least one parking brake (FP) for immobilizing the vehicle on the parking space, wherein the parking space supports the vehicle at a changeable orientation when the motor vehicle is parked thereon, said parking brake having an electrical actuation intended for being positioned at a wheel, and a control unit (UC) that generates a first command to the parking brake (FP) to apply parking braking or to interrupt the application of parking braking at a first intensity (F 1 ) following a first request corresponding to a first inclination of the motor vehicle, and wherein the control unit (UC) generates a second command to the parking brake (FP) to apply parking braking at a second intensity (F 2 ) in response to a second request issued after the first request when a change in inclination of the motor vehicle with respect to the first inclination is predicted.
2 . The braking system according to claim 1 , wherein the first request and the second request are issued by a driver of the motor vehicle by actuating a parking brake control.
3 . The braking system according to claim 2 , wherein the first request and the second request are issued by the control unit (UC), the first request being an automatic actuation of the parking brake (FP) upon the stopping of the motor vehicle.
4 . The braking system according to claim 1 , wherein at least one of the first and second requests is issued by the control unit (UC) and the other of the requests is issued by the driver of the vehicle.
5 . The braking system according to claim 1 , wherein the parking brake (FP) is integrated into a service brake and includes a motor reduction gear.
6 . A motor vehicle having four wheels and a braking system according to claim 1 , wherein the braking system has two parking brakes (FP), one for each rear wheel.
7 . A method of operation of the braking system fitted to a motor vehicle, wherein the braking system includes at least one parking brake (FP) for immobilizing the vehicle on a parking space, wherein said parking brake has an electrical actuation intended for being positioned at a wheel, and a control unit (UC) configured for generating a first command to the parking brake (FP) to apply parking braking or to interrupt the application of parking braking at a first intensity (F 1 ) following a first request and for generating a second command to the parking brake (FP) to apply parking braking at a second intensity (F 2 ) in response to a second request issued after the first request, the method comprising the steps of: following parking of the motor vehicle on the parking space, issuing the first request to activate the parking brake at the first intensity (F 1 ) corresponding to a first inclination of the motor vehicle, sending the first command to the parking brake (FP) which applies a parking braking force at the first intensity (F 1 ), predicting a change in inclination of the parking space, sending the second request to apply the parking braking force at the second intensity (F 2 , F 3 ), and applying the braking force at the second intensity (F 2 , F 3 ).
8 . The method of operation according to claim 7 , wherein the first request is issued by the driver or the control unit, and the second request is issued by the driver.
9 . The method of operation according to claim 7 , wherein the first request is issued by the driver or the control unit and the second request is issued by the control unit.
10 . The method of operation according to claim 9 , wherein the second request is issued by the control unit following a consultation of a satellite navigation system.

Description

This application claims priority benefits from French Patent Application No. 2209846, filed Sep. 28, 2022, the disclosure of which is incorporated herein by reference. TECHNICAL FIELD AND PRIOR ART The present invention relates to a braking system for a motor vehicle and to a method of operation of such a braking system. Motor vehicles are equipped with a braking system with a brake at each wheel. The braking system provides service braking, which allows the vehicle to be slowed down and stopped. Service braking is generally obtained by depressing a brake pedal. The service braking can be controlled automatically by a control unit, e.g. in the case where automatic speed regulation is desired. The braking system also provides parking braking, which is intended for immobilizing the vehicle when the vehicle is parked. The parking brake can also be used as an emergency brake. Until recently, the parking brake was actuated by the driver pulling on a brake lever connected directly to the rear wheel brakes by a cable, the greater the traction, the greater the level of parking braking. The driver could therefore modulate the level of braking of the parking brake. Increasingly frequently, the parking brake is actuated by pressing a button which sends a signal to the control unit which activates electric motors. The level of braking applied by the brakes during parking braking is set by the control unit according to the parking situation of the vehicle. When the vehicle is parked on horizontal ground, the level of braking is set at a first value, while when the vehicle is parked on a slope, the level of braking is set at a second value higher than the first value. The level of braking is permanently set throughout the parking phase of the vehicle and cannot be modified. The inventors have identified that in certain parking situations it is desirable to be able to increase the level of braking. For example, when a vehicle is to be transported by a vehicle-carrier semi-trailer, the vehicle is mounted on the trailer and is parked horizontally or substantially horizontally. The parking brake is activated. With the vehicle being horizontal, the level of braking applied to the wheels is the level programmed for a vehicle parked on horizontal ground. However, it happens that on this type of trailer some vehicles are positioned at an inclination in order to optimize the number of vehicles transported. For this purpose, the trailer includes parts which can be tilted. The part of the trailer with vehicles is then tilted after the vehicle has been parked horizontally and the parking brake has been activated. As a result, the vehicle is parked on a slope and the level of braking is the level of a horizontal or substantially horizontal parking. There is therefrom a risk that the vehicle is not be sufficiently immobilized. OUTLINE OF THE INVENTION Therefore, a goal of the present application is to propose a braking system which does not have the aforementioned drawback. The goal stated hereinabove is achieved by a braking system for motor vehicle, including at least one parking brake intended for being positioned at a wheel and a control unit intended for controlling the brake so as to provide parking braking, the control unit being configured so that, in response to a second request for applying a parking brake following a first request for applying a parking brake, the control unit sends an instruction to change the level of braking. In one example of embodiment, the second request is formulated by the driver who considers that the level of braking in parking should be increased in anticipation of a change in inclination of the vehicle compared to the inclination taken into account in response to the first request. In another example of embodiment, the second request is formulated by the control unit which anticipates that the inclination of the vehicle could change, e.g. if same is informed, e.g. via the satellite navigation system, that the vehicle is parked on a boat. The swell can change the parking inclination of the vehicle. Advantageously, the first and second successive requests are issued in a given period of time. One subject matter of the present invention is a braking system for a motor vehicle, including at least one electrically actuated parking brake intended for being positioned at a wheel, a control unit configured for generating a command for the parking brake to apply parking braking or to interrupt the application of parking braking at a first intensity in response to a first request. The control unit is also configured for generating a command for the parking brake to apply parking braking at a second intensity in response to a second request issued after the first request. In one embodiment, the first request and the second request are issued by a driver of the motor vehicle by actuating a parking brake control. In another example of embodiment, the first request and the second request are issued by the con