Vehicle height control system with deductive naught operation exclusion means

摘要

In a vehicle height control system comprising four actuators for controlling vertical positions of a pair of front wheels and a pair of rear wheels relative to a vehicle body and three vehicle height sensors for detecting the vertical positions relative to the vehicle body of three of the pairs of front and rear wheels except a fourth one of the pairs of front and rear wheels, a naught operation exclusion device is provided to prevent vehicle height control system to operate, the naught operation exclusion device detecting running on a rock or the like or falling in a hole or the like of the fourth wheel or jacking up of the vehicle body at the fourth wheel based upon a comparison of the vertical position relative to the vehicle body of a wheel diagonal to the fourth wheel detected by the vehicle height sensor therefor with similar relative vertical positions detected by the vehicle height sensors for the other two wheels located on opposite sides of a diagonal line connecting the fourth wheel and the one wheel diagonal to the fourth wheel.