Patent ID: 8857201

Claim:
An air-conditioning device for a vehicle comprising: a refrigerating cycle including a compressor to compress and discharge refrigerant, the compressor being driven by an engine of the vehicle, and an evaporator to evaporate refrigerant by exchanging heat with air to be sent for a passenger compartment of the vehicle; a controller to control a refrigerant discharge capacity of the compressor in a manner that a refrigerant evaporation temperature of the evaporator approaches a target temperature; an upper limit setting portion to set an upper limit for a fuel amount consumed by the engine based on at least the refrigerant evaporation temperature; and a determining portion to determine whether an estmation value is larger than the upper limit, wherein, the determining portion estamates the estimation value for the fuel amount consumed by the engine by subtracting a first fuel comsumption amount from a second fuel comsumption amount and then adding a fuel amount consumed for driving the vehicle, the first fuel comsumption amount is defined when the compressor is stopped and the second fuel comsumption amount is defined when the compressor is active, and the controller controls the refrigerant discharge capacity of the compressor in a manner that an actual fuel amount consumed by the engine is equal to or lower than the upper limit when the determining portion determines that the estimation value is larger than the upper limit.