CONTROLLER FOR CAR AIR-CONDITIONER

PURPOSE:In an air-conditioner having refrigerating cycle to be driven by an auxiliary engine, to improve controllability through simple structure by controlling an electromechanical operator for operating a rotary speed regulating member of auxiliary engine in accordance to thermal load in cabin. CONSTITUTION:In a bus air-conditioner, an auxiliary engine 1 or Diesel engine will regulate engine rotation and start/stop engine through function of fuel injection pump 2 and fuel regulation rack 3 while a stepping motor 9 for operating rack 3 is provided. Through operation of engine 1, a refrigerant compressor 11 is driven through a belt 14 to feed refrigerant through condenser 15 and reducing valve 17 to evaporator 16 to perform air-cooling. Said stepping motor 9 will control an auxiliary engine through a control circuit in accordance with the outputs from inner, outer air sensors 23, 24, cooling degree sensor 25, temperature setter and operation mode exchange switch.