Akebono Brake Industry Co., Ltd.

Hiroyuki Yoshizawa

Toshifumi Maehara

Katsuya Miyake

Yoshio Takahashi

Haruki Shimanuki

Yoshiaki Hirobe

Satoru Eguchi

In an anti-lock control system for a motor vehicle, the design is made such that such that computed vehicle speed is prevented from remarkably departing from real vehicle speed as driving wheel slips before anti-lock control is started, thereby preventing occurrence of non-braking condition when anti-lock control is started. To this end, the manner in which the computed vehicle speed is computed, is changed between during braking operation (when anti-lock control is being effected) and non-braking operation (when no anti-lock control is being effected).

Anti-lock control system for motor vehicles

In anti-skid control system for motor vehicles of the type that the drive system of the motor vehicle is switchable to direct-coupled 4WD system, brake pressure reduction starting points in the anti-skid control are set up to come earlier when the drive system of the motor vehicle is switched to the direct-coupled 4WD system than when said drive system is other than the direct-coupled 4WD system.

Anti-skid control system for motor vehicles

Herein disclosed is a vehicular anti-lock system of the type, in which a valve mechanism is disposed in a main passage which connects a master cylinder and a brake system such that its opening and closing operations are controlled by the movement of a control piston having its one end subjected to the pressure of the brake system. A fail-safe piston is made movable in a cylinder and has its one end engaging with the valve seat member of the valve mechanism and its other end connected with a liquid pressure source which is independent of the master cylinder. The control piston is made movable in the fail-safe piston and has its other end facing a control chamber. Between the liquid pressure source and the control chamber, there is connected a first valve which is adapted to be closed in response to a brake releasing signal. Between the control chamber and a reservoir, there is connected a second valve which is adapted to be opened in response to the brake releasing signal. A bypass passage is disposed in parallel with the valve mechanism and is adapted to be closed when the fail-safe piston is caused to bring the valve seat member into engagement with the wall of the valve chamber by the pressure of the liquid pressure source.

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Hasuda, Japan

Hiroyuki Yoshizawa