| 摘要 |
PURPOSE: A method is provided, in which average amount of backward shift of piston is determined by temperatures of the compressor and evaporator, to thereby prevent compressor faults and failures and improve compressor performance and efficiency. CONSTITUTION: A method comprises the first step of measuring temperatures of the evaporator and compressor; the second step of estimating a suction pressure and a discharge pressure by utilizing a preset table in accordance with the temperatures measured in the first step; and the third step of determining an average amount of backward shift of the piston by utilizing the suction pressure and discharge pressure estimated in the second step. The compressor is controlled in accordance with thus-determined average amount of backward shift, to thereby allow the compressor to have a constant compression ratio and estimate location of the piston in an accurate manner.
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