Torque estimating divice for compressor

A torque estimating device of a compressor for an ejector-type refrigerant cycle device that includes:

• the compressor configured to compress and discharge refrigerant;
• a radiator configured to cool the refrigerant discharged from the compressor;
• an ejector that includes a nozzle portion configured to decompress the refrigerant flowing out of the radiator, a refrigerant suction port from which refrigerant is drawn by jet refrigerant jetted from the nozzle portion, and a pressure increasing portion configured to mix the jet refrigerant and the refrigerant drawn from the refrigerant suction port and to pressurizing the mixed refrigerant;
• and a suction side evaporator configured to evaporate the refrigerant to be drawn into the refrigerant suction port, the torque estimating device comprising:
• a high pressure detector disposed to detect a physical amount having a relation with a high-pressure side refrigerant pressure of a refrigerant cycle;
• an evaporation pressure detector disposed to detect a physical amount having a relation with a refrigerant evaporation pressure in the suction side evaporator;
• a pressurizing estimating means for estimating a pressurizing amount in the pressure increasing portion to be increased in accordance with an increase of a pressure difference between the high-pressure side refrigerant pressure and the refrigerant evaporation pressure;
• and
• a suction pressure estimating means for estimating a suction refrigerant pressure of the compressor by using the pressurizing amount estimated by the pressurizing estimating means.