CAR HEIGHT ADJUSTING DEVICE

PURPOSE:To accurately protect a suspension device that varies car height and air supply system by stopping the adjustment of car height when the internal pressure of the gas room of this suspension device reaches the upper and lower bound values even the car height does not reach a normal height. CONSTITUTION:When an auto start switch 23 is set to ON to automatically adjust car height, a solenoid valve 6 is opened. If the car height state detected by a car height sensor 18 is HIGH, an electromagnetic valve 15 for releasing an atmosphere is opened intermittently and the car height is reduced gradually. On the other hand, when the car height state is LOW, a compressor 2 is driven and the car height of a rear cushion 10 is increased. In this case, when an 'OK' signal is not output from the car height sensor 18 due to the heavy load of the car body through the internal pressure of the atmospheric room for adjusting the car height of the rear cushion 10 exceeds the upper bound value, the car height adjustment is stopped preferentially by using the output signal of a pressure sensor 16 through a control unit 17.