Patent ID: 8490742

Claim:
A hydraulic power steering unit comprising: an assist force generating unit that uses oil to generate assist force for steering by a steering device; an oil pump unit that supplies oil to the assist force generating unit; a load detecting device that detects load applied to the oil pump unit; a controller that controls the oil pump unit, wherein the controller includes a command flow setting device that sets a command flow rate of oil supplied from the oil pump unit to the assist force generating unit in accordance with a vehicle quantity of state that includes at least one of a vehicle speed and a steering angle, and a flow correcting device that corrects the command flow rate of oil set by the command flow setting device to provide at least two correction flow rates, by determining each correction flow rate in accordance with both a speed of the oil pump unit and the load applied to the oil pump unit, and selectively adding and subtracting the respective correction flow rate to and from the command flow rate.