Patent ID: 6913326

Claim:
A hydraulic pressure control apparatus for controlling a pressure of a working fluid in a brake cylinder, said apparatus comprising: a pump device connected to said brake cylinder and including at least one set of a pump for pressurizing the fluid and delivering the pressurized fluid to said brake cylinder and an electric motor for operating said pump; a low-pressure source for storing the fluid discharged from said brake cylinder; a solenoid-operated pressure control valve disposed between said low-pressure source and said brake cylinder and operated with an electric energy applied thereto, for controlling a pressure of the fluid in said brake cylinder depending upon an amount of said electric energy; and a controller including pressure increase control means for increasing the pressure of the fluid in said brake cylinder by controlling an amount of electric energy to be applied to said electric motor while said pump is held in communication with said brake cylinder, such that said amount of electric energy to be applied to said electric motor corresponds to an operating state of a manually operable brake operating member, and pressure reduction control means for reducing the pressure of the fluid in said brake cylinder by controlling the amount of said electric energy applied to said solenoid-operated pressure control valve, such that the pressure of the fluid in said brake cylinder is reduced with a change in the amount of electric energy applied to said solenoid-operated pressure control valve.