Patent ID: 6964178

Claim:
An air conditioning system for a vehicle, an internal combustion engine of which is temporarily stopped, comprising: a compressor driven by the engine; a condenser device for heat radiating and condensing refrigerant pumped out from the compressor; a depressurizing means for depressurizing the refrigerant discharged from the condenser device; an evaporator operatively connected to the depressurizing means for evaporating the depressurized refrigerant and thereby cooling air to be blown into a passenger room of the vehicle; a cool storage heat exchanger provided at an upstream side of the evaporator and having cool storage material which will be cooled down by the depressurized refrigerant during the compressor is operated; and an electronic control unit for controlling the operation of the above components, wherein the air conditioning system further comprises: a bypass passage connected between an inlet side of the compressor and a downstream side of the depressurizing means and having a check valve for flowing the refrigerant from the inlet side of the compressor to the downstream side of the depressurizing means; a driving flow passage branching off from an upstream side of the depressurizing means and having a control valve for opening and closing the driving flow passage; an ejector having a high pressure inlet port connected to the driving flow passage and a suction port connected to the cool storage heat exchanger, in which a nozzle of the ejector converts pressure energy of the high pressure refrigerant from the driving flow passage into speed energy by depressurizing and expanding the refrigerant, the ejector sucks the refrigerant from the cool storage heat exchanger by jet flow of the refrigerant ejected from the nozzle and having a high flow velocity, and a pressure increasing portion of the ejector mixes the ejected refrigerant with the sucked refrigerant and converts the speed energy into the pressure energy to increase the pressure of the refrigerant to be supplied to the evaporator, wherein the electronic control unit controls the control valve to open the driving flow passage and to start the operation of the ejector, when the operation of the compressor is stopped due to the temporal operational stop of the engine.