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:
Sep. 06, 2005
Filed:
Apr. 04, 2003
Danny R. Taylor, Freeville, NY (US);
Stanley B. Quinn, Jr., Elmhurst, IL (US);
Danny R. Taylor, Freeville, NY (US);
Stanley B. Quinn, Jr., Elmhurst, IL (US);
BorgWarner Inc., Auburn Hills, MI (US);
Abstract
In a variable cam timing (VCT) system () which has a feedback control loop wherein an error signal () relating to at least one sensed position signal of either a crank shaft position () or at least one cam shaft position () is fed back for correcting a predetermined command signal (). The system further includes a valve () for controlling a relative angular relationship of a phaser (); and includes a variable force solenoid () for controlling a translational movement of the valve (). An improved control method comprising the steps of: providing a dither signal () sufficiently smaller than the error signal (); as temperature varies, changing at least one parameter relating to the dither signal (); and applying the dither signal () upon the variable force solenoid (), thereby using the dither signal () for overcoming a system hysteresis without causing excessive movement of valve ().