Apparatus and method for controlling displacement of positive displacement compressor

Application Number: 00107043
Application Date: 2000.03.14
Publication Number: 1266946
Publication Date: 2000.09.20
Priority Information: 1999/9/10 JP 257987/99; 1999/3/15 JP 69037/99
International: F04B27/14;F04B49/06
Applicant(s) Name: K. K. Toyota Jidoshokki Seisakusho
Inventor(s) Name: Ota Masaki;Murao Kazushige;Fukanuma Tetsuhiko
Patent Agency Code: 72001
Patent Agent: lin changan
Abstract A variable displacement compressor compresses gas supplied from an evaporator of an external refrigerant circuit and discharges the compressed gas to the refrigerant circuit. A check valve is located between the compressor suction chamber and the evaporator. The check valve prevents gas flow from the suction chamber to the evaporator. When the compressor is stopped, a displacement control valve increases the pressure in a crank chamber of the compressor to move a swash plate to a minimum inclination position. The pressure in the suction chamber is increased by gas supplied from the crank chamber. Closing the check valve accelerates a pressure increase in the suction chamber. When the pressure in the suction chamber is increased, the control valve limits a further pressure increase in the crank chamber. As a result, the force that decreases the inclination of the swash plate is limited.