| 摘要 |
PROBLEM TO BE SOLVED: To make it simple and easy to steer at an auxiliary driver's seat and prevent effectively contact with property and people situated about a vehicle owing to accidental turning motion. SOLUTION: If front wheels have been steered at a large steering angle at a point of time when a driver leaves a driver's main seat, the front wheels return automatically to neutral by operation of a first hydraulic selector valve 114 connected to a first energizing circuit, which includes a group of switches 136, 138 and 140 for detecting seat leaving as well as switches 100L and 100R of a steering angle sensor 100, and of a neutral-return control system or device, and thereafter steering is conducted. By this, an incident does not happen that the front side of a vehicle produces large displacement unanticipated by the driver, and therefore danger can be reduced of damaging a wheel, a wheel support, and the like of an aircraft by making contact with these, or of injuring workmen around the aircraft. |
