Patent ID: 8870299
Filing Date: 2014-10-28
Classification: B60T

Abstract:
1. A service brake device for a vehicle, comprising: at least one ABS pressure control valve, which is controlled for slip-regulated braking by an electronic control unit, has at least one inlet valve and one outlet valve and is arranged upstream of a pressure medium actuated brake cylinder; and a pressure medium line which supplies the ABS pressure control valve with a pressure medium and into which a pressure controlled by a valve device arranged upstream of the ABS pressure control valve is feedable, wherein the valve device feeds a pressure derived from a reservoir pressure of a pressure medium reservoir into the pressure medium line as a function of an activation by the electronic control unit; wherein at least one pressure sensor for measuring the pressure in the pressure medium line is arranged in the pressure medium line, wherein the electronic control unit is configured such that it controls the inlet valve and/or the outlet valve of the ABS pressure control valve and/or the valve device within the course of at least one test run, in order to generate a pressure detectable by the at least one pressure sensor in the pressure medium line, wherein the pressure sensor is coupled to the valve device and the pressure medium line couples the valve device and the ABS pressure control valve, wherein evaluation of the signals supplied by the pressure sensor is used to detect the temporal pressure profile of the pressure fed into the pressure medium line and compares said pressure profile with an expected stored pressure profile, wherein an error signal is generated in the event of a deviation, present in accordance with predetermined criteria, of the detected pressure profile from the expected stored pressure profile, wherein the electronic control device is configured so that it: (a) directs the inlet valve and the outlet valve of the ABS pressure control valve into the blocking position, and then (b) controls the valve device to feed pressure derived from the pressure medium reservoir into the pressure medium line, within the course of a first test run, and wherein the electronic control unit is configured such that, within (b), it additionally directs at least one of the inlet valve and the outlet valve of the ABS pressure control valve into the open position.