Patent ID: 9028015
Filing Date: 2015-05-12
Classification: B60T

Abstract:
1. A method for operating an hydraulic brake system including an electromechanically operable parking brake for a motor vehicle with a driving engine furnished with a mechanical gear box composed of an operating element, an electronic control and regulation unit associated with a service brake system which receives wheel rotational speed values from wheel rotational speed sensors, at least one unit comprising an electronic control unit associated with the electromechanically operated parking brake for generating a parking brake application force, and brake devices on at least one axle being lockable by the at least one unit, the method comprising: sensing a release operation of a parking brake to detect a starting maneuver of the motor vehicle; estimating a drive torque of the driving engine; and actuating the at least one unit after detection of the starting maneuver of the motor vehicle, wherein the electronic control and regulation unit actuates the at least one unit in order to reduce a parking brake application force to an inclination-responsive holding force when the starting maneuver is detected and before the release operation of the parking brake is performed, wherein a clutch pedal travel sensor detects a position of a clutch pedal of the motor vehicle, and actuation of the release operation occurs when the clutch pedal has reached a position ahead of a clutch bite-point and an estimated driving torque of the driving engine exceeds a threshold value, wherein an actuating speed of the clutch pedal is detected using the clutch pedal travel sensor, and the electronic control and regulation unit associated with the service brake system and the at least one unit comprising the electronic control unit associated with the electromechanically operable parking brake of the hydraulic brake system communicate with each other by a data line.