The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2002
Filed:
Jul. 18, 1997
Masahiro Kawaguchi, Kariya, JP;
Ken Suitou, Kariya, JP;
Masanori Sonobe, Kariya, JP;
Hiroshi Kubo, Kariya, JP;
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, JP;
Abstract
A compressor has a swash plate located in a crank chamber and tiltably mounted on a drive shaft. A piston is operably coupled to the swash plate and is located in a cylinder bore. The inclination of the swash plate is varied according to the difference between the pressure in the crank chamber and the pressure in the cylinder bore. The compressor has a supply passage for connecting a discharge chamber with the crank chamber. A control valve is located in the supply passage for adjusting the amount of the gas introduced into the crank chamber from the discharge chamber through the supply passage. The control valve includes a valve body and a solenoid selectively excited and de-excited based on a supply of electric current from a driver to actuate the valve body. The solenoid generates a counter-electromotive force based on the self-inductance of the solenoid when the solenoid is de-excited. A protector, such as a diode, is connected in parallel with the solenoid. The protector passes the current based on the counter-electromotive force therethrough to prevent the current based on the counter-electromotive force from being supplied to the driver.