Compensating for VCT phase error over speed range 

Patent No. 7,021,257

Issued: April 4, 2006
Filed: April 2, 2003

Inventors: Ekdahl; Earl (Ithaca, NY); Taylor; Danny R. (Freeville, NY)
Assignee: BorgWarner, Inc. (Auburn Hills, MI)

A method for compensating for variable cam timing of an internal combustion engine is provided. The method includes: a) providing a periodical crank pulse signal; b) providing a periodical cam pulse signal; c) determining a segment, wherein the internal combustion engine speed induces a volatile change upon Zphase values; d) dividing the segment into sub-segments; and e) calculating Zphase values of a plurality of points within the sub-segments.


This application claims an invention which was disclosed in Provisional Application No. 60/389,201, filed Jun. 17, 2002, entitled "Compensating for VCT Error Over Speed Range." The benefit under 35 USC 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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