| 摘要 |
A four-wheel steering system for a vehicle including a front wheel steering part having a front direction control valve (18) having ports (28, 30) which close and open in accordance with a rotating direction of a steering wheel (16), and a front actuator (10) for pushing or pulling a tie rod (12, 14) connected to a front wheel (2, 4), an electronic control unit (ECU) for controlling a steering of the rear wheels (38, 40) in response to signals transmitted from a vehicle speed sensor (60), a steering angle sensor (58) and a steering amount feedback sensor (68, 70, 72, 74) and a rear wheel steering part having first and second solenoid valves (54, 56) independently controlled by said electronic control (ECU), first and second rear direction control valves (42, 44) independently controlled by said electronic control unit (ECU) and first and second rear wheel actuators (46, 48) for pulling or pushing said rear wheels (38, 40) selectively or simultaneously. |
