초록 ▼

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 dr

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.

대표청구항 ▼

[ What is claimed is:] [1.] A hydraulic pressure control apparatus comprising:a seating valve including a valve member and a valve seat and disposed in a fluid passage such that the fluid passage is separated by said seating valve into a high-pressure portion and a low-pressure portion when the seat

[ What is claimed is:] [1.] A hydraulic pressure control apparatus comprising:a seating valve including a valve member and a valve seat and disposed in a fluid passage such that the fluid passage is separated by said seating valve into a high-pressure portion and a low-pressure portion when the seating valve is placed in a closed state thereof with said valve member being seated on said valve seat, and such that a pressure difference between pressures of a working fluid in said high-pressure and low-pressure portions of the fluid passage acts on said valve member in a first direction for moving the valve member away from said valve seat so as to place said seating valve in an open state thereof;an elastic member which biases said valve member in a second direction for moving said valve member to be seated on said valve seat;a valve driving device operated with an electric current applied thereto, to generate a drive force acting on said valve member in said first direction; anda control device which controls an amount of said electric current to be applied to said valve driving device, to thereby control said valve driving device,and wherein said control device comprises a stepping control device which increments the amount of said electric current when said seating valve is operated from said closed state into said open state, said stepping control device determining an increment of the amount of said electric current such that said increment decreases with an increase in said pressure difference.