Compensating for VCT phase error over speed range

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 (62); b) providing a periodical cam pulse signal (66); c) determining a segment, wherein the internal combustion engine speed induces a volatile change upon Zphase values (90); d) dividing the segment into sub-segments; and e) calculating Zphase values (90) of a plurality of points within the sub-segments.