| 摘要 |
PROBLEM TO BE SOLVED: To support most of the live load with two rear axles and to reduce the load applied to front wheels by exciting actuators when the difference between the theoretical steering angle of rear and front wheels and the actual steering angle against the steering angle of front wheels exceeds the prescribed value even if the vehicle speed is nearly 0. SOLUTION: When a steering angle corresponding to the steering angle of front wheels is attained, an electronic control device 69 switches a control valve 67 to the cutoff state, and rear and front wheels are steered at the angle interlocked with the steering angle of the front wheels. This control action is not taken when the vehicle speed is 0. However, the control valve 67 is switched to energize a hydraulic cylinder 51 when the difference between the theoretical steering angle of rear and front wheels and actual steering angle against the steering angle of front wheels is the prescribed value or above, the neutral switch of a transmission is not turned on, a clutch switch is not turned on, and the steering angle of front wheels does not exist in a dead zone of the prescribed value or below even if the vehicle speed is 0. |
