VEHICLE-HEIGHT CONTROL SYSTEM

In a vehicle-height control system, a relationship "PV = nRT" is established in the case where air cylinders (2) are defined as a single sealed area. Lowering of a temperature of air in an air chamber (19) lowers a vehicle height. Thus, the vehicle height is controlled to a relatively high vehicle height in the case where down control is executed in a state in which an inside temperature in the vehicle-height control system is high and it is estimated that the inside temperature lowers to an outside-air temperature. With this control, the vehicle height is brought closer to a true target vehicle height when the inside temperature has lowered. Also, it is possible to shorten a time of operation of a compressor (40), resulting in reduction of power consumption of a battery.