| 摘要 |
PURPOSE:To reduce the error ratio and improve followability by moving rear wheels little by little by means of a rear wheel steering device when the front wheel steering speed is low and moving them faster when it is high. CONSTITUTION:A steering device 2 steering front wheels 1 and a rear wheel steering device 4 steering rear wheels 3 are provided, and the rear wheels steering device 4 is driven by a pulse motor 5. The steering angle of the steering handle 6 of the steering device 2 is detected by a steering angle sensor 7, the signal of the steering angle sensor 7 is inputted to a control means, and the control means feeds a control signal in response to the front wheel steering angle to the pulse motor 5. The change status of the speed or acceleration of the signal of the steering angle sensor 7 is detected by a steering judging means, and a step angle setting means outputs a signal decreasing the step angle of the pulse motor 5 when the change quantity of the steering is small and relatively increasing the step angle of the pulse motor 5 when the change quantity of the steering is large to the pulse motor 5 via the control means based on the output of this steering judging means. |
