Control unit for power steering apparatus and steering-wheel-angle correcting system

A control unit for use with a power steering apparatus including a hydraulic cylinder for controlling steerage of steered wheels in response to rotation of a steering wheel and a tire angle sensor for detecting the tire angle of said steered wheels, said control unit comprising:

• a main operating-oil supply device, removably connected to a rotation shaft of the steering wheel, for supplying the hydraulic cylinder with an amount of oil corresponding to a rotated amount of the steering wheel;
• a correcting-oil supply device for, in response to a control signal, supplying correcting oil to correct operation of the hydraulic cylinder;
• a steering-wheel-angle detector, disposed around the rotation shaft of the steering wheel connected with said main operating-oil supply device, for detecting a steering wheel angle corresponding to a rotating position of the steering wheel;
• and
• a control circuit device for generating, on the basis of the steering wheel angle detected by said steering-wheel-angle detector and the tire angle detected by the tire angle sensor, a control signal to compensate for a discrepancy in corresponding relationship between the steering wheel angle and the tire angles, and controlling the supply, by said correcting-oil supply device, of the correcting oil,
• wherein said steering-wheel-angle detector and said control circuit device are attached to a housing of said main operating-oil supply device so that said steering-wheel-angle detector and said control circuit device are provided as a one-piece unit with said main operating-oil supply device.