Patent ID: 8155855

Claim:
A vehicle motion control apparatus comprising: a motion controlling means operating a pump for supplying brake fluid between a pressure difference control valve, which is disposed between a master cylinder and a wheel cylinder provided corresponding to each wheel, and a pressure increasing control valve disposed between the pressure difference control valve and the wheel cylinder and corresponding to each wheel cylinder, the motion controlling means controlling the pressure difference control valve to generate a pressure difference between a master cylinder side and a wheel cylinder side to reach a commanded target pressure and controlling the pressure increasing control valve, thereby pressurizing the wheel cylinder corresponding to the wheel to be controlled, irrespective of a driver's brake operation; a control amount adjusting means adjusting a control amount of a motor driving the pump to be small when a frictional coefficient of a road surface is smaller than a predetermined value, compared to when the frictional coefficient of the road surface is larger than or equal to the predetermined value; a load judging means judging a load condition of the motor when determining to reduce the control amount of the motor; and a pressure difference controlling means controlling the pressure difference generated by the pressure difference control valve to be small when the load imposed on the motor is in a high load condition, compared to when the load imposed on the motor is not in the high load condition.