Patent ID: 6519958
Filing Date: 2003-02-18
Classification: F04C,F24F,F25B,Y02B

Abstract:
A system for controlling starting operation of an air conditioner, comprising:a compressor controlled in a pulse width modulation manner according to a duty control signal; an electronic expansion valve for expanding refrigerant compressed in said compressor; a high pressure conduit connecting the exit side of said compressor and the inlet side of said electronic expansion valve; a low pressure conduit connecting the exit side of said electronic expansion valve and the inlet side of said compressor; a bypass conduit connected at its first end to the high pressure conduit and at its second end to the low pressure conduit; a flow rate regulating valve mounted on said bypass conduit for regulating a flow rate of fluid flowing through said bypass conduit; and a control unit for controlling said electronic expansion valve, said flow rate regulating valve and said compressor to perform two starting operations in such a way that said flow rate regulating valve is open and said electronic expansion valve is closed in a first starting operation, and said flow rate regulating valve is open and said electronic expansion valve is open to a predetermined extent in a second starting operation, said compressor being controlled by a duty control signal having a period shorter than a period for a normal operation during said starting operations.