Patent ID: 7976108
Filing Date: 2011-07-12
Classification: B60T

Abstract:
1. A vehicle brake hydraulic pressure control system comprising: a hydraulic pressure generating source which outputs hydraulic pressure in response to operation of a brake pedal; wheel brakes which operate by application of hydraulic pressure; a pump driven by an electric motor; a motor rotational speed detecting unit which detects a rotational speed of the electric motor; a target rotational speed setting unit which sets a target rotational speed for the electric motor; a main hydraulic pressure path which communicates the hydraulic pressure generating source with the pump; a sub hydraulic pressure path which communicates the main hydraulic pressure path with the wheel brakes; a normally open solenoid valve interposed between the sub hydraulic pressure path and the hydraulic pressure generating source; a brake hydraulic pressure detecting unit which detects hydraulic pressures at the wheel brakes; a target wheel brake pressure setting unit which sets target hydraulic pressures for the wheel brakes; and a controller which controls the electric motor so that the rotational speed detected by the motor rotational speed detecting unit becomes the target rotational speed and also controls the normally open solenoid valve so that the hydraulic pressures in the wheel brakes become the target wheel brake hydraulic pressure, wherein the controller decreases a control amount of the normally open solenoid valve as a deviation between the detected rotational speed and the target rotational speed increases.