Fuji Jukogyo Kabushiki Kaisha

Hideki Ishido

Katsumasa Igarashi

Takayuki Ushijima

Seiichi Ishizeki

Ryuzo Sakakiyama

Mitsuo Umezawa

Hiroshi Tsukagoshi

An antilock brake control for motor vehicles, wherein the actual wheel speed of each wheel of the vehicle is detected, and in dependency on the detected wheel speed, a reference vehicle speed is computed from which a reference wheel speed lower than the vehicle speed is determined, and wherein when the actual wheel speed decreases below the reference wheel speed as a result of braking operation, the braking hydraulic pressure acting on the wheel is decreased to allow the actual wheel speed to increase, and then the braking hydraulic pressure is reincreased when the actual wheel speed has recovered sufficiently. When a J-turn state of the vehicle is detected by lateral acceleration, the reference vehicle speed is changed to a lower value and a second reference wheel speed is determined on the basis of that lower value. The control of the braking operation is thus carried out in dependency on the second reference wheel speed shifted to a lower level, whereby the time when the braking hydraulic pressure is increased is advanced, and the time length during which the braking hydraulic pressure is decreased is shortened so that effective braking operation is carried out in the J-turn state.

Antilock brake control method and system for motor vehicles

A motor vehicle has an antilock brake system which is provided for preventing wheels from locking, and an automatic transmission of the vehicle has a one-way clutch for transmitting the output of an engine of the vehicle to wheels of the vehicle at acceleration of the engine, and a clutch for transmitting torque from the wheels to the engine, thereby effecting engine braking. A detector is provided for detecting operation of the antilock brake system and for producing a signal. In response to the signal, the clutch is released, thereby rendering the engine braking ineffective.

Control system for an automatic transmission of a motor vehicle with an

In an antilock brake control for motor vehicles wherein a condition of locking of the wheels during braking is detected from the wheel speeds, and a control pattern of decreasing and reincreasing of the braking hydraulic pressure is repeated for carrying out effective braking operation, at least a phenomenon occurring in the vehicle in J-turn state is detected, and when the phenomenon exceeds a predetermined value, the antilock brake control is shifted from the normal mode to a J-turn mode in which different conditions are used. To detect the J-turn state, the difference in wheel speed between the right and left wheels is detected. Alternatively, lateral acceleration of the vehicle is also detected. Another alternative is a combination of the steering angle, the coefficient of friction between the wheels and the road surface, and the vehicle speed.

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Tokyo, Japan

Hideki Ishido