Displacement control system for variable displacement compressor

摘要

A displacement control system (A) of a variable displacement compressor sets a target for pressure in an intake chamber or a crank chamber, on the basis of a detected evaporator-outlet air temperature and a target for evaporator-outlet air temperature. The pressure of a refrigerant in a high-pressure section is detected, and a regulating current is supplied to a solenoid (316) of a displacement control valve, on the basis of the pressure of the refrigerant in the high-pressure section and the target for pressure.

主权项

1. A displacement control system of a variable displacement compressor provided in a circulation line along which a refrigerant circulates, together with a radiator, an expansion device and an evaporator to constitute a refrigeration cycle of an air conditioning system, and designed such that variation in control pressure causes variation in displacement, comprising:
a displacement control valve including a valve body configured to open and close a valve hole by receiving high-pressure in a first direction, at least either of low-pressure and said control pressure in a second direction opposite to the first direction, and electromagnetic force generated by a solenoid, where the high-pressure is the pressure of the refrigerant at a location in a high-pressure section of the refrigeration cycle and the low-pressure is the pressure of the refrigerant at a location in a low-pressure section of the refrigeration cycle, the displacement control valve being capable of regulating the displacement of the variable displacement compressor by varying said control pressure by opening and closing the valve hole; a high-pressure detection means for detecting said high-pressure; an external information detection means for detecting external information about the refrigeration cycle; a target pressure setting means for setting a target for said low-pressure or said control pressure based on the external information detected by said external information detection means; and a current regulation means for regulating current supplied to the solenoid of the displacement control valve in one or more regulation modes, where in a first regulation mode, the current regulation means regulates the current supplied to the solenoid of the displacement control valve based on a difference between the high-pressure detected by the high-pressure detection means and the target for pressure set by the target pressure setting means, wherein the target pressure setting means is configured to set the target for pressure in one or more setting modes, and wherein said one or more setting modes include a first setting mode to set a target for temperature of air immediately after passing across the evaporator, and set said target for pressure to cause the temperature of air immediately after passing across the evaporator to approach said target for temperature.