| 摘要 |
PURPOSE:To maintain the favorable steering feeling even if front wheels are steered auxiliarily independently of the turning operation of a steering wheel. CONSTITUTION:A microcomputer 56 controls a motor control circuit 60 according to the yaw rate (behavior of a vehicle) detected by a yaw rate sensor 52 and the lateral wind (external turbulence) detected by a lateral wind sensor 53 and revolves an electric motor 46. Front wheels FW are auxiliarily steered independently of the operation of a steering wheel 20 by the revolution of the electric motor 46. At this time, the microcomputer 56 receives a motor current instruction value supplied into the electric motor 46 from the motor control circuit 60 and controls the conduction current supplied into a solenoid valve 31 on the basis of the motor current instruction value, and reduces the supplied oil pressure to a hydraulic reaction force chamber 28. Accordingly, the reaction force supplied to the steering wheel 20 due to the auxiliary steering for front wheels FW is reduced, and a driver does not feel sense of imcompatibility. |
