Method for ensuring a braking effect

摘要

A method for ensuring a braking effect utilizes a service brake system and a parking brake system of a vehicle. The service brake system is configured to be actuated irrespective of a driver input, and the parking brake system is activated by an extraneous force, for example in an electromechanical arrangement. When a deceleration request is received, the service brake system is initially actuated. If a deceleration variable remains below a target value and the measured slip is smaller than a slip threshold value, the parking brake system is actuated in order to bring the vehicle to a standstill.

主权项

1. A method for ensuring a braking effect of a brake system having a service brake system for building up a braking torque independently of a driver for at least one wheel, a parking brake for at least one wheel which is activated independently of the service brake system via an electromechanical actuating unit, and at least one wheel rotational speed sensor at a wheel associated with the service brake system, the method comprising the following steps:
a) receiving a deceleration request at an electronic control unit of the brake system and, in response thereto, building up braking torque via the service brake system in accordance with the deceleration request and determining a deceleration target value, b) determining a deceleration variable of the vehicle, c) determining a slip variable of at least one wheel, d) comparing the determined deceleration variable with the deceleration target value, e) comparing the determined slip variable with a slip threshold value, f) determining that the deceleration variable is smaller than the deceleration target value, and g) in response to determining that the deceleration variable is smaller than the deceleration target value, activating the parking brake only when the slip variable is smaller than the slip threshold value.