Method of changing the duty cycle frequency of a PWM solenoid on a cam phaser to increase compliance in a timing drive 

Patent No. 7,214,153

Issued: May 8, 2007
Filed: November 4, 2003

Inventors: Simpson; Roger T. (Ithaca, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI) 

A chain drive having a phaser such as a hydraulic vane phaser interposed between a timing chain and a driving or driven shaft is provided. The phaser or the vane are controlled to oscillate more at certain engine speeds to thereby reduce the tensioning force on the chain at the certain engine speeds.


This application claims an invention which was disclosed in Provisional Application No. 60/488,272, filed Jul. 18, 2003, entitled METHOD OF CHANGING THE DUTY CYCLE FREQUENCY OF A PWM SOLENOID ON A CTA CAM PHASER TO INCREASE COMPLIANCE IN A TIMING DRIVE. The benefit under 35 USC .sctn.119(e) of the U.S. provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.

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