Claims
- 1. A method for compensating for variable cam timing of an internal combustion engine comprising the steps of:
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.
- 2. The method of claim 1 further comprising the step of saving the Zphase values in a memory device.
- 3. The method of claim 1 further comprising the step of using the Zphase values for engine calibration.
- 4. The method of claim 1, wherein the calculating step calculates Zphase values using an interpolation method.
- 5. The method of claim 1, wherein the determining step includes performing experiment upon the engine.
- 6. The method of claim 1, wherein the periodical cam pulse signal includes at least one full advance position and full retard position in relation to the periodical crank pulse signal.
- 7. The method of claim 6, wherein the periodical cam pulse signal includes one cam pulse that is designated to be positioned within a range defined by the full advance position and the full retard position.
- 8. The method of claim 1, wherein the crank pulse signal and the cam pulse signal are provided using variable reluctance sensors.
- 9. The method of claim 1 further comprising the step of using the Zphase values for reducing cam position measurement error during normal engine operation.
REFERENCE TO RELATED APPLICATIONS
[0001] 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.
Provisional Applications (1)
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Number |
Date |
Country |
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60389201 |
Jun 2002 |
US |