Device and method for controlling displacement of variable displacement compressor

摘要

A variable displacement compressor compresses gas supplied from an evaporator (74) of an external refrigerant circuit (71) and discharges the compressed gas to the refrigerant circuit (71). A check valve (92; 98) is located between the compressor suction chamber (37) and the evaporator (74). The check valve (92; 98) prevents gas flow from the suction chamber (37) to the evaporator (74). When the compressor is stopped, a displacement control valve (46) increases the pressure in a crank chamber (15) of the compressor to move a swash plate (31) to a minimum inclination position. The pressure in the suction chamber (37) is increased by gas supplied from the crank chamber (15). Closing the check valve (92; 98) accelerates a pressure increase in the suction chamber (37). When the pressure in the suction chamber (37) is increased, the control valve (46) limits a further pressure increase in the crank chamber (15). As a result, the force that decreases the inclination of the swash plate (31) is limited. <IMAGE>