Morgan & Finnegan, L.L.P.
Control valve for variable displacement compressors
 A control valve for controlling displacement of a variable displacement compressor having a suction chamber, a discharge chamber, a control chamber, and a pressurizing passage. The control valve adjusts the amount of refrigerant sent to the control chamber from the discharge chamber to control the compressor displacement. The control valve includes a valve body for adjusting the opened area of the pressurizing passage. A solenoid urges the valve body in a first direction with a force corresponding to the value of the current fed to the solenoid. A first and second pressure chamber are partitioned by a diaphragm in the valve. A target value of the pressure difference between the first and second pressure chambers is determined by the urging force of the solenoid. For a given constant solenoid current, the compressor seeks the target value that corresponds to that current. The solenoid requires only a relatively small current range, even if carbon dioxide is used as the refrigerant. Also, the valve minimizes the compressor displacement when it receives no current. 
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
F F F F F F F
F04B F04B F04B F04B F04B F25B F04B
additional additional additional additional inventional additional additional
Yoshiyuki Naoya Toshiro Kazuo
Nakane Yokomachi Fujii Murakami