Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-03-11
1999-11-16
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031131, 303152, 303162, 3031132, 303901, 303DIG4, B60T 832
Patent
active
059844329
ABSTRACT:
Hydraulic pressure control apparatus wherein a pressure difference across a seating valve disposed in a fluid passage acts on a valve member for placing the seating valve in an open state, while an elastic member biases the valve member for placing the seating valve in a closed state, and a valve driving device operated with an electric current applied thereto generates a drive force acting on the valve member so as to open the seating valve. A control device for controlling the electric current includes a stepping controller for incrementing the amount of the electric current when the seating valve is operated from the closed state into the open state, such that an increment of the electric current decreases with an increase in the pressure difference. The hydraulic pressure control apparatus may be suitably used in a vehicle braking system, for controlling fluid pressure in wheel brake cylinder.
REFERENCES:
patent: 5462343 (1995-10-01), Yoshida et al.
patent: 5558414 (1996-09-01), Kubota
patent: 5683149 (1997-11-01), Aizawa et al.
patent: 5727851 (1998-03-01), Okubo et al.
patent: 5758930 (1998-06-01), Schiel et al.
Kawahata Fumiaki
Nakamura Kiyoharu
Otomo Akihiro
Sakai Akira
Soejima Shin'ichi
Butler Douglas C.
Toyota Jidosha & Kabushiki Kaisha
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