Control method for preventing integrator wind-up when operating VCT at or near its physical stops

Patent No. 6,766,776

Issued: July 27, 2004
Filed: November 1, 2002

Inventor: Jiang, Zhenyu; Ekdahl, Earl (Ithaca, NY)

Assignee:BorgWarner Inc. (Auburn Hills, MI)


In a VCT system, a method uses a controller to automatically determine a state of a phaser based on an identifier. The identifier identifies a filtered signal of the crank shaft and cam shaft and uses the same to identify the phaser state. A reset signal is generated by the identifier to reset the VCT system, specifically to reset a control law whereby the unnecessary information retained by the VCT system is cleared. Therefore, the controller is able to promptly and accurately determine the phaser position and state.


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