Patent ID: 6615644
Filing Date: 2003-09-09
Classification: G01D,G01M

Abstract:
A method for correcting a rectangular signal from a camshaft position sensor that corresponds to passage of a tooth and a hollow of a target secured to a camshaft of an engine, the method comprising the steps of:comparing angular values (&agr;T and &agr;N) of alternations of the rectangular signal to mechanical angles (&ggr;T and &ggr;N) of the tooth and the hollow and, based on this comparison, calculating a first phase shift (&agr;1) of a rising face of the rectangular signal with respect to a corresponding flank of the tooth and a second phase shift (&agr;2) of a falling face of the rectangular signal with respect to a corresponding flank of the tooth, wherein a difference between the angular values (&agr;T and &agr;N) and the mechanical angles (&ggr;T and &ggr;N) and a ratio between the first phase shift (&agr;1) and the second phase shift (&agr;2) are used to calculate the first and second phase shifts (&agr;1, &agr;2).