| 摘要 |
PROBLEM TO BE SOLVED: To secure the quick response of an electronic expansion valve at a sudden transient operation state where the temperature of the discharge pipe goes up excessively. SOLUTION: The target travel (PfZY) of an electronic expansion valve 5 where the temperature of the discharge pipe of a compressor 1 becomes an optimum value in usual air conditioning is computed, and also in the case that 'PfZY' is exceeds the preset cutoff value, 'PfZY' is cut off a cutoff value, and this is made defined as an actual travel P, and the electronic expansion valve 5 is driven by the travel P. By such constitution, in the case that the temperature of the discharge pipe is not less than the specified value and the electronic expansion valve 5 travels in opening direction, an addition valueαset, according to the temperature of the discharge pipe is added to the actual travel P obtained by cutting off 'PfZY' for correction, and based on P after this correction, the electronic expansion valve 5 make a travel to open, thus as compared with the case wherein P of the valve is not corrected by addition, the opening action of the valve becomes quicker by the amount of correction, and it is shifted into optimum operation state in a short time, and also the occurrence of the hunting of the discharge pipe temperature based on the valve opening action is prevented.
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