Patent ID: 8870301

Claim:
A hydraulic brake system comprising: a hydraulic pressure source provided for a vehicle, and including a hydraulic-pressure generating device and a reservoir a plurality of hydraulic brakes provided for respective wheels of the vehicle, and configured to restrain rotation of the respective wheels a common passage to which brake cylinders of said hydraulic brakes are connected; at least one of a pressure-increasing control valve group disposed between said common passage and said hydraulic-pressure generating device and a pressure-reducing control valve group disposed between said common passage and said reservoir; wherein said at least one of said pressure-increasing control valve group and said pressure-reducing control valve group includes at least one ON/OFF control valve and at least one linear control valve that are disposed in parallel with each other, wherein each of said at least one ON/OFF control valve is opened and closed by an ON/OFF control that is applied to supply an electric current to a solenoid of said each of said at least one ON/OFF control valve, and wherein each of said at least one linear control valve is capable of continuously controlling a pressure difference between a high-pressure side and a low-pressure side of said each of said at least one linear control valve b a continuous control that is applied to supply an electric current to a solenoid of said each of said at least one linear control valve; and a hydraulic-pressure control device configured to control a hydraulic pressure in said common passage, by controlling said at least one of said pressure-increasing control valve group and said pressure-reducing control valve group, wherein said hydraulic-pressure control device includes: (i) a linear-control-valve individual controlling portion configured, when said least one ON/OFF control valve is being closed, to continuously control an amount of the electric current supplied to said solenoid of each of said at least one linear control valve, (ii) an ON/OFF-control-valve combination controlling portion configured to continuously control the amount of the electric current supplied to said solenoid of each of said at least one linear control valve and to control ON/OFF of the supply of the electric current to said solenoid of each of said at least one ON/OFF control valve, and (iii) a required-response-speed-based selecting portion configured to select one of said linear-control-valve individual controlling portion and said ON/OFF-control-valve combination controlling portion, based a required response speed that is required for controlling the hydraulic pressure in said common passage.