POWER STEERING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a power steering device of a hydraulic type capable of improving returnability of a steering wheel to a neutral position after steering without providing a steering angle sensor. SOLUTION: Hydraulic pressures PR and PL of both hydraulic chambers 32 and 33 as detected by pressure sensors 40 and 41 are compared with a hydraulic equivalent value P for a target steering assist direction and target steering assist force determined based on a steering force signal T. When the hydraulic pressures PR and PL of the hydraulic chambers 32 and 33 are larger, an electric motor 36 is driven in a direction to lower the hydraulic pressure in the hydraulic chambers 32 and 33 by a returning control quantity PM by a returning control means provided in this.