| 摘要 |
A rear axle (10) which supports rear wheels (11) is attached to the body of a vehicle in such a way as to be swingable up and down around a center pin (10a). A controller (29) detects the running state from detection values &thetas; and V of a sensor (21) for detecting the tire angle of the rear wheels and a sensor (22) for detecting a vehicle speed, and detects the load state from detection values H and w of a height sensor (27) and a pressure sensor (28). When a determination value derived from the detection values &thetas; and V becomes equal to or greater than a set value which is determined in accordance with the detection values H and w, an electromagnetic changeover valve (14) of a dumper (13) is switched to carry out control to lock the rear axle. When a sensor is diagnoses as failing, maximum values &thetas;max and Vmax or the like are selected as most severe detection values. Even one of a set of sensors fails, therefore, the rear axle will not be locked as long as the vehicle runs in such a way that the detection value of the other sensor allows the determination value to be smaller than the set value. <IMAGE> |
