Patent ID: 9505289
Filing Date: 2016-11-29
CPC Classification: B60H,F04F,F25B

Claim Text:
1. A torque estimating device of a compressor for an ejector-type refrigerant cycle 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 pressurize the mixed refrigerant; and a suction side evaporator disposed in a branch passage through which the refrigerant flows from the radiator to the refrigerant suction port of the ejector to evaporate the refrigerant to be drawn into the refrigerant suction port, the torque estimating device comprising: a pressure detector disposed on a discharge side of the compressor to detect a physical amount having a relation with a high-pressure side refrigerant pressure of the refrigerant cycle before the refrigerant is decompressed; an evaporation pressure detector disposed to detect a physical amount having a relation with a refrigerant evaporation pressure in the suction side evaporator; a circulation flow amount detector disposed in the compressor to detect a physical amount having a relation with a circulation refrigerant flow amount circulating in the refrigerant cycle; a controller configured to: estimate the circulation refrigerant flow amount by using the physical amount detected by the circulation flow amount detector; estimate an enthalpy difference between an enthalpy of the refrigerant at an inlet side of the nozzle portion and an enthalpy of the refrigerant at an outlet side of the nozzle portion based on a pressure difference between the high-pressure side refrigerant pressure and the refrigerant evaporation pressure; estimate a recovery energy by integrating the circulation refrigerant flow amount to the enthalpy difference; estimate a pressurizing amount in the pressure increasing portion by converting the recovery energy to a pressure energy; estimate a suction refrigerant pressure of the compressor by adding the pressurizing amount in the pressure increasing portion to the refrigerant evaporation pressure; estimate a pressurizing amount in the compressor by subtracting the suction refrigerant pressure from the high-pressure side refrigerant pressure; and estimate a drive torque of the compressor, by using the circulation refrigerant flow amount and the pressurizing amount in the compressor.