| 摘要 |
PROBLEM TO BE SOLVED: To provide a four-wheel steering work vehicle hard to break down by improving shock resistance, water resistance, dust resistance, and foreign substance resistance of a steering angle sensor, capable of improving reliability, automatically and promptly determining the presence or absence of an abnormal condition of a steering system including the steering angle sensor, performing fail-safe action when the abnormal condition occurs, and improving control accuracy and steering feeling. SOLUTION: Front wheels 12L, 12R and rear wheels 14L, 14R are respectively provided with steering angle sensors 51L, 51R, 52L, 52R. On the basis of a detected steering angle of the first front wheel 12L, 12R, a control means 100 calculates a steering angle that the second front wheel 12R, 12L should have. The calculated steering angle of a detected steering angle of the second front wheel 12R, 12L detected by the front wheel steering angle sensor 51R, 51L are compared with each other. When a deviation of them is not less than a specified value, it is determined that an abnormal condition occurs in a front steering system including the front wheel steering angle sensor 51L, 51R. |
