| 摘要 |
PROBLEM TO BE SOLVED: To enable precise control of an electric expansion valve to be carried out by using a motor of low cost. SOLUTION: By an opening degree setting section 126 of a micro-computer 98, the degree of opening of an electrical expansion valve is set in response to the temperature of a compressor and the temperature of refrigerant. In addition, by a driving control section 128, a driving step in compliance with the number of steps of a motor 120 for the electric expansion valve is set and a control signal corresponding to the driving step is outputted. By an opening degree adjusting section 132, the control signal based on the driving step increased or decreased by one step is outputted in cases where the driving signal is needed to be changed in reference to the set degree of opening and a degree of opening of the driving step, resulting in that the degree of opening of the electric expansion valve is changed in compliance with elapse of time and the mean degree of opening of the electrical expansion valve may become a set degree of opening. |
