Patent ID: 6430493
Filing Date: 2002-08-06
Classification: B60T

Abstract:
A vehicular brake control device comprising:a master cylinder which is capable of generating a brake fluid pressure in response to a brake pedal depression force; hydraulic pressure control means for controlling a brake fluid pressure which is transmitted from the master cylinder to each of wheel cylinders of respective wheels; pressure application means for automatically applying a hydraulic pressure to each of the wheel cylinders independent of a brake pedal depression by way of the hydraulic pressure control means: and control means for controlling a braking force of each of the wheels by driving the pressure application means, the hydraulic pressure control means, or both, the hydraulic pressure control means including a first electromagnetic valve for establishing and interrupting fluid communication between the master cylinder and each of the wheel cylinders and a second electromagnetic valve for establishing and interrupting fluid communication between a reservoir and each of the wheel cylinders, the control means including pressure application check means for making all the first electromagnetic valves of the respective wheels and all the second electromagnetic valves of the respective wheels closed and opened, respectively, at a predetermined timing and for initiating a pressure application check for judging whether or not the automatic pressure application is made successfully by controlling the pressure application means, the pressure application check means including electromagnetic valve abnormal condition judging means for judging whether the first electromagnetic valve of one of the wheel cylinders fails to be kept opened if the rate of change of the hydraulic pressure applied by the pressure application means increases after an elapse of a fixed time duration (KT1) from the initiation of the pressure application check.