Harness, Dickey & Pierce, PLC
Supercritical refrigerating cycle system
 A CO.sub.2 cycle system having a variable capacity compressor is controlled even when the refrigerant delivery capacity of the variable capacity compressor changes. When the refrigerant delivery capacity of the variable capacity compressor decreases, the aperture of an electric expansion valve is fixed for a predetermined time To. When the refrigerant delivery capacity has not changed, the aperture of the electric expansion valve is controlled so that the refrigerant temperature and pressure on the outlet side of a system heat exchanger change along an optimal control line. As a result, because the refrigerant delivery capacity Qd of the compressor is controlled in correspondence with the intake pressure Ps, i.e., the pressure on the side of the evaporator, without being influenced by control of the expansion valve side, the CO.sub.2 cycle system can be adequately controlled. 
Denso Corporation Kabushiki Kaisha Jidoshokki Seisakusho
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F25B F25B F25B F25B F25B F25B F25B F25B F25B Y02B
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Naoya Toshiro Shin Motohiro
Yokomachi Fujii Nishida Yamaguchi