Abstract
Since the engine of an automotive determines the output of the engine torque by compensating a torque corresponding to the compressor torque to drive the refrigerant compressor for an air conditioner, accurately calculating the torque of the air conditioner compressor can improve fuel economy and quietness through optimal engine power control. In this study, a torque calculation based on differential pressure which is a function of refrigerant mass flow rate is proposed by replacing the conventional torque calculation method based on evaporator load condition. Reliability of torque calculation was confirmed through evaluation under an automotive operating condition. In test results, torque calculation error under differential pressure was improved from 0.3~1.0 N·m depending on the condition compared to the previous method.
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