Denso Corporation

Takuya Tanihata

Hiroaki Kawano

A refrigeration cycle device includes a charged-amount determination unit that executes a charged-amount determination to determine whether the refrigeration cycle device is in a refrigerant shortage state or not, a compressor control unit that controls a compressor, and a decompression control unit that controls a throttle opening degree of a decompression device. The charged-amount determination unit determines that the refrigeration cycle device is in the refrigerant shortage state when a heat dissipation capacity of a radiator shows a tendency to decrease in a case where the decompression control unit decreases a throttle opening degree of the decompression device while the compressor control unit operates the compressor.

Refrigeration cycle device

A vapor-compression refrigerant cycle includes a variable displacement compressor for compressing refrigerant, a control unit for controlling the displacement of the compressor. The control unit includes a lock determining means for determining a lock of a sliding portion of the compressor, and the lock determining means determines that the sliding portion of the compressor is locked, when a control signal where the displacement of the compressor is equal to or larger than a predetermined value is output from the control unit, and when an absolute value of a temperature difference between an air temperature before being heat-exchanged in a low-pressure heat exchanger of the vapor-compression refrigerant cycle and the air temperature after being heat-exchanged in the low-pressure heat exchanger is equal to or smaller than a predetermined temperature. Therefore, the lock of the compressor can be accurately detected.

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Kariya, Japan

Takuya Tanihata