Patent ID: 9643470
Date: 2017-05-09
CPC Classifications: B60H,F25B

Claim:
1. A vehicle air conditioning apparatus comprising: a compressor configured to compress and discharge a refrigerant; a radiator provided in a vehicle interior and configured to release heat from the refrigerant; a heat exchanger provided in the vehicle interior and configured to absorb the heat into the refrigerant; and an outdoor heat exchanger provided outside the vehicle interior and configured to release the heat from or absorb the heat into the refrigerant, the vehicle air conditioning apparatus performing: a cooling operation to release the heat from the refrigerant discharged from the compressor in the outdoor heat exchanger, to decompress the refrigerant by an expansion part, and to absorb the heat into the refrigerant in the heat exchanger; a cooling and dehumidifying operation to release the heat from the refrigerant discharged from the compressor in the radiator and the outdoor heat exchanger, to decompress the refrigerant by the expansion part, and to absorb the heat into the refrigerant in the heat exchanger; a heating operation to release the heat from the refrigerant discharged from the compressor in the radiator, to decompress the refrigerant by the expansion part, and to absorb the heat into the refrigerant in the outdoor heat exchanger; and a heating and dehumidifying operation to release the heat from the refrigerant discharged from the compressor in the radiator, to decompress part of the refrigerant by the expansion part, and to absorb the heat into the refrigerant in the heat exchanger while decompressing a remaining refrigerant by the expansion part and then absorbing the heat into the refrigerant in the outdoor heat exchanger, the vehicle air conditioning apparatus further comprising: a flow regulating valve provided in a refrigerant flow passage to flow the refrigerant into the heat exchanger and configured to regulate an amount of the refrigerant flowing through the refrigerant flow passage; an evaporating temperature detection part configured to detect an evaporating temperature of the refrigerant in the heat exchanger; and a flow control part configured to reduce the amount of the refrigerant flowing into the heat exchanger by using the flow regulating valve, when the evaporating temperature detected by the evaporating temperature detection part is a predetermined temperature or lower during the heating and dehumidifying operation.