Method for controlling electronic slip-controllable brake system for motor vehicle

Abstract

A brake system has an actuation device (26) for specifying a brake request by the driver and comprises multiple brake devices which can be actuated independently of one another by an electronic controller (34). A first brake device (10) has a wheel brake (14) to which a pressure medium under a braking pressure can be applied by a drivable pressure generator (50), wherein the pressure generator (50) can be brought into contact with a pressure medium reservoir (15) via a supply line (62). A second brake device is equipped with a drivable electric machine in order to convert kinetic energy of the motor vehicle into electric energy. Both brake devices together contribute to the process of generating the braking power of the brake system, wherein the proportion each brake device contributes to the braking power is variable. If the braking power can be raised solely by the second brake device, a connection through which the pressure medium can flow is established between the wheel brake (14) and the pressure medium reservoir (15) by means of the electronic controller (34) in order to reduce a grinding torque potentially present at the wheel brake (14) of the first brake device (10).

Description

technical field [0001] The invention relates to a method for controlling an electronically slip-adjustable brake system for a motor vehicle according to the features of the preamble of claim 1 . Background technique [0002] Known electronically adjustable brake systems of motor vehicles have an actuating device by means of which a brake request can be specified by the driver of the motor vehicle. This braking request is detected by means of a sensor system and supplied to the electronic controller, which ascertains from these input signals the braking power that can be applied by the braking system. This braking power is then jointly applied by a plurality of braking devices which can be actuated or actuated separately from one another by the electronic controller. The first brake device is equipped with a drivable pressure generator, which supplies pressure medium to the wheel brakes under the build-up of the brake pressure, while the second brake device has a drivable el...

AI Technical Summary

Problems solved by technology

[0006] In addition, complete pressure compensation in the first braking device is difficult if the corresponding braking device is designed as a closed system and therefore has no connection to the atmosphere.

Although a possible residual brake pressure can be reduced in a sensor-controlled manner in a closed system by means of the actuation of the pressure generator, however due to sensor tolerances or due to exhaustion of the delivery volume of the pressure generator (which is especially can occur when a plunger device is used as pressure generator), complete pressure compensation cannot be ensured in all cases

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