Fluid-pressure and analogous brake systems – Speed-controlled – With failure responsive means
Patent
1997-10-02
1999-02-09
Young, Lee W.
Fluid-pressure and analogous brake systems
Speed-controlled
With failure responsive means
303169, B60T 888
Patent
active
058684735
ABSTRACT:
The invention is directed to a hydraulic braking pressure control system which includes wheel brake cylinders, a pressure generator for supplying a hydraulic braking pressure to the wheel cylinders through two hydraulic pressure circuits, and a pressure control device disposed in the two circuits, between the pressure generator and the wheel cylinders, for controlling the hydraulic pressure in each of the wheel cylinders. The system further includes wheel speed sensors for detecting wheel speeds of the road wheels, respectively, and a braking force controller which controls the braking force by actuating the pressure control device in accordance with control modes provided in response to output signals of the wheel speed sensors. A circuit malfunction detection unit is provided for detecting malfunction caused in either one of the two hydraulic circuits on the basis of output signals of the wheel speed sensors, and a control mode changeover unit is provided for changing over a control mode to another control mode, when the circuit malfunction detection unit detects the malfunction. For example, a wheel speed comparison unit compares the wheel speed in one of the two circuits with the wheel speed in the other circuit, and the circuit malfunction detection unit detects the malfunction on the basis of the compared result of the wheel speed comparison unit.
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Abe Yasuhiro
Kato Toshihisa
Yamada Noritaka
Aisin Seiki Kabushiki Kaisha
Toyota Jidosha & Kabushiki Kaisha
Young Lee W.
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