PURPOSE: To reduce the occurrence of mutual interference between front and rear wheels related to braking by a method wherein, in a 3-channel antilock control method for a 4-wheel drive car, control of a brake liquid pressure is made on right and left rear wheels such that a wheel speed being the lowermost speed of four wheel speeds is a wheel speed to be controlled.
CONSTITUTION: From outputs from wheel speed sensors 1 - 4 mounted to respective wheels, wheel speeds Vw1 - Vw4 are determined by computing circuits 5 - 8, respectively. Left and right front wheel speeds Vw1 and Vw2 produce first and second system speeds Vs1 and Vs2 as they are to send them to second control logic circuits 9 and 10. The lowermost wheel speed of the wheel speeds Vw1 - Vw4 is selected by a low select circuit 11, and is sent as a third system speed, i.e. a rear wheel system speed Vs3, to a third control logic circuit 12. By the control logic circuits 9, 10, and 12, ON and OFF control of a hold valve HV and a decay valve DV is effected such that the system speeds Vs1 - Vs3 are respective wheel speeds to be controlled.
SHIMANUKI HARUKI
EGUCHI MEGUMI
MIYAKE KATSUYA
AKIMA HIDEO
MORI FUMITOSHI
FUJITSU LTD