Patent ID: 8527174

Claim:
A brake controlling apparatus of a braking device including a booster valve to be opened at a time of request to boost a pressure of a brake liquid to supply to a wheel to be controlled, and a piston pump for supplying pressurized brake liquid to an upstream side of the booster valve, the brake controlling apparatus comprising: a brake liquid pressure controlling unit that sets a duty ratio between a closing period and a opening period of the booster valve so that the opening period of the booster valve becomes at least a dischargeable period of the brake liquid in the piston pump, and controls the booster valve based on the duty ratio, wherein the brake liquid pressure controlling unit sets the duty ratio of the booster valve so that the opening period of the booster valve becomes at least a period of longer than or equal to one cycle of the piston pump, and the brake liquid pressure controlling unit sets the duty ratio of the booster valve so that the opening period of the booster valve becomes at least an inverse number of an output rotation number per one second of the electric motor.