Patent ID: 8777336

Claim:
A brake apparatus for a vehicle comprising: a master cylinder configured to generate a master cylinder fluid pressure corresponding to a brake operation; a wheel brake device that is provided for each wheel and configured to apply a braking force to the wheels by supplying a brake fluid from the master cylinder to wheel cylinders; a control fluid pressure generation device including: a fluid pressure control valve connected between the master cylinder and the wheel cylinders; and a fluid pressure pump having a discharge port communicating between the fluid pressure control valve and the wheel cylinders and a suction port communicating between the master cylinder and the fluid pressure control valve; an electric motor configured to drive the fluid pressure pump; a control fluid pressure setting unit configured to set a control fluid pressure to be added to the master cylinder fluid pressure so that a wheel cylinder fluid pressure occurring in the wheel cylinder is higher than the master cylinder fluid pressure; wherein the control fluid pressure generation device rotates the electric motor with a target rotation number to circulate a brake fluid, whose flow rate is a relief flow rate, from the fluid pressure pump to the fluid pressure control valve and applies a control current to the fluid pressure control valve to thus generate the control fluid pressure in the fluid pressure control valve, the relief flow rate being a flow rate to normally operate the pressure control valve, and a target rotation number setting unit configured to calculate a brake fluid amount that is supplied to the wheel cylinders based on a change in the control fluid pressure, calculate a discharge flow rate of the fluid pressure pump based on the brake fluid amount and the relief flow rate, and set a target rotation number of the electric motor based on the discharge flow rate.