Patent ID: 6637836
Filing Date: 2003-10-28
Classification: B60T,Y10S

Abstract:
A brake servo unit being configured to have at least one function to increase and decrease pressure of a master cylinder for brakes by brake pedal inputted power, and another function to increase and decrease pressure of said master cylinder by operating an automatic braking actuator based on a control device electric control signal,said automatic brake actuator having electromagnetic control valve mechanism configured to control operating power to said master cylinder at a time of automatic braking operation, with solenoid current to operate said control valve mechanism being controlled by said electric control signal, wherein pressure in said master cylinder increases from zero pressure to a peak, and then decreases to zero pressure at a time of automatic braking and constitutes an automatic braking control per time, wherein a control device that outputs the electric control signal is configured to detect and record a solenoid current value at a start of the pressure increase in said master cylinder when the first automatic braking control is performed after starting said control device, and to correct an initial value of said solenoid current of control-starting based on said solenoid current value recorded when second and subsequent automatic braking control is performed.