| 摘要 |
In a vehicle provided with a rear wheel toe angle varying device for individually varying toe angles of rear wheels, upon detection of a failure to steer one of the rear wheels (5), the rear wheel of a healthy side is steered in a direction to enable the vehicle to travel straight ahead. Preferably, a control unit (12) of the rear wheel toe angle varying device steers the rear wheel of a healthy side in parallel to the rear wheel of the faulty side. Thereby, the vehicle is enabled to travel straight ahead even though the traveling direction of the vehicle is at a certain angle with respect to the longitudinal line of the vehicle body. At this time, front wheels (3) are typically steered at the same angle as the rear wheels. The device may further comprises a toe angle estimating unit (84) that, upon occurrence of a failure to steer one of the rear wheels, steers the rear wheel of a healthy side to a zero angle, and estimates a steering angle of the rear wheel of a faulty side from a steering angle of front wheels when the vehicle is traveling straight ahead.
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