Nissan Motor Company Limited

Atsugi Unisai Corporation

Ishiro Kaneda

Masahiko Hara

Koji Morita

Yuji Oishi

Hiroyuki Watanabe

Katsunori Shirai

A pressure control device for a hydraulic braking system of an automotive vehicle is provided with a master cylinder for pressurizing hydraulic fluid according to a braking action of a driver. A wheel cylinder for applying braking force to a wheel is communicated with the master cylinder through a main passage. An accumulator is connected to the main passage. A rotating condition of the wheel is detected by a detector and is outputted as a signal indicative of the rotating condition of the wheel. A hydraulic pressure controller is arranged to control the wheel cylinder hydraulic pressure when the detector detects one of a lock condition and a slippage condition. The hydraulic pressure controller is communicated with the main passage. A switching device is arranged to stop the communication between the master cylinder and the hydraulic pressure controller, and open the communication between the accumulator and the hydraulic pressure controller when the detector detects the slippage condition in acceleration. Therefore, during the slippage control in acceleration, the hydraulic fluid stored in the hydraulic pressure controller is returned to the main passage owing to the pressure difference therebetween.

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Atsugi, Japan

Ishiro Kaneda