| 摘要 |
PROBLEM TO BE SOLVED: To neutralize a steering angle of a wheel, which is a control object, more properly. SOLUTION: When a failure occurs to a steering angle imparting mechanism 2, if a steering angle of a rear wheel 10 is changed to a direction away from a neutral position by the steering angle imparting mechanism 2, the steering angle imparting mechanism 2 is made into a non-operable locked condition. If the steering angle of the rear wheel 10 is changed to a direction getting close to the neutral position by the steering angle imparting mechanism 2, the steering angle imparting mechanism 2 is made into an unlocked condition, in which the lock is canceled. Therefore, only a change into a direction, in which the steering angle gets close to the neutral position by the steering angle imparting mechanism 2, is allowed, so that the steering angle of the rear wheel 10, which is a control object, is recovered to the neutral position more properly. COPYRIGHT: (C)2008,JPO&INPIT
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