A controller for controlling the displacement of a variable displacement compressor (CP) that does not require an engine ECU to presume the load torque of the compressor and thus does not require the preparation of a load torque presumption map for each ty...

There is provided a car air conditioner with a high COP, low GWP and high reliability. A simple refrigerant R32 is filled in a refrigerant circuit 1 of the car air conditioner. This simple refrigerant R32 has a high COP and low GWP, but is easily polarized...

An air conditioning apparatus includes a refrigerant circulation circuit that has a compressor. A driving status of the compressor is detected by first detector. A first calculator (81) calculates a theoretical torque and a driving efficiency of the compre...

An air-conditioning system for a vehicle including a refrigerant circuit and an engine (EG), has a compressor (CP) in the refrigerant circuit, a battery, an electric motor (MG) and a mechanism (PT) operative to controllably connect and disconnect a power t...

An air-conditioning system for a vehicle, including a refrigerant circuit and an engine, has a battery, a compressor, an electric motor and a load torque control mechanism. The battery supplies electric power. The compressor is operative to compress refrig...

A vehicle air conditioning apparatus includes a refrigerant circuit (30). The air conditioning apparatus is driven by an engine (101). The air conditioning apparatus includes a variable displacement compressor (104). An external information detector (65, 6...

A controller controls a displacement of a compressor which is installed in a refrigerant circuit of an air-conditioning system. The controller has a pressure difference detector (40, 54). An air conditioning switch (81) turns the air conditioning system on...

A control valve (46) is located in a variable displacement compressor used in a refrigerant circuit. The control valve (46) operates such that the pressure difference (PdH-PdL) between two pressure monitoring points (P1, P2) in the refrigerant circuit seek...