Patent ID: 6672687
Filing Date: 2004-01-06
Classification: B60T

Abstract:
A vehicle motion control device comprising:a wheel cylinder equipped on a vehicle wheel for providing a braking torque; an automatic hydraulic pressure generator including a master cylinder, a booster and a booster actuator, the master cylinder supplying a master cylinder hydraulic pressure to the wheel cylinder, the booster boosting actuation of the master cylinder in accordance with operation of a brake pedal, and the booster actuator actuating the booster irrespective of the operation of the brake pedal and generating the master cylinder hydraulic pressure in the master cylinder; a hydraulic pressure control valve disposed between the automatic hydraulic pressure generator and the wheel cylinder for controlling a brake hydraulic pressure of the wheel cylinder; control means for controlling the booster actuator of the automatic hydraulic pressure generator and the hydraulic pressure control valve in accordance with a running condition of the vehicle and for performing an automatic pressure increase control to the wheel cylinder; abnormality detecting means for detecting an abnormality of the automatic hydraulic pressure generator; abnormality transaction means for performing a predetermined transaction with respect to the automatic pressure increase control by the control means when the abnormality detecting means detects the abnormality of the automatic hydraulic pressure generator; variable state detecting means for detecting a variable state of the booster actuator; hydraulic pressure detecting means for detecting the master cylinder hydraulic pressure; the abnormality detecting means calculating the master cylinder hydraulic pressure based on the variable state detected by the variable state detecting means when the brake pedal is not under operation and detecting the abnormality of the automatic hydraulic pressure generator by comparing the calculated master cylinder hydraulic pressure with the master cylinder hydraulic pressure detected by the hydraulic pressure detecting means.