Heat pump type air conditioner for vehicle

A heat pump type air conditioner for a vehicle, comprising:

• refrigerant;
• a compressor applying workload to said refrigerant;
• an outer heat exchanger connected to a refrigerant discharge side of said compressor and radiating heat of said refrigerant into ambient air;
• a blower leading air for air-conditioning a passenger compartment of the vehicle;
• a heat-radiating inner heat exchanger connected to the refrigerant discharge side of said compressor and transmitting the heat of said refrigerant to the air led by said blower;
• an expansion valve connected to a refrigerant outlet side of said heat-radiating inner heat exchanger;
• a heat-absorbing inner heat exchanger connected to a refrigerant outlet side of said expansion valve and a refrigerant suction side of said compressor, said heat-absorbing inner heat exchanger cooling the air led by said blower by transmitting the heat of the air to said refrigerant which is supplied through said expansion valve from at least one of said outer heat exchanger and said heat-radiating inner heat exchanger;
• a switching device disposed among the refrigerant discharge side of said compressor, a refrigerant inlet side of said outer heat exchanger and a refrigerant inlet side of said heat-radiating inner heat exchanger, said switching valve leading said refrigerant from said compressor to said outer heat exchanger during cooling operation and leading said refrigerant from said compressor to said heat-radiating inner heat exchanger while bypassing said outer heat exchanger during heating operation;
• refrigerant heating means for heating said refrigerant, said refrigerant heating means including an upstream refrigerant heater which is disposed upstream of said heat-absorbing inner heat exchanger and a downstream refrigerant heater which is disposed downstream of said heat-absorbing inner heat exchanger;
• refrigerant condition detecting means for detecting the condition of said refrigerant, said refrigerant condition detecting means including first, second, third and fourth thermal-properly detectors which are disposed at a refrigerant inlet side and a refrigerant outlet side of the upstream refrigerant heater, a refrigerant inlet side and a refrigerant outlet side of the downstream refrigerant heat, respectively;
• and
• control means for turning on said refrigerant heating means according to the condition of said refrigerant which is detected by said refrigerant condition detecting means.