Method of determining the position of a cam phaser

Details Method of determining the position of a cam phaser Method of determining the position of a cam phaser

2005-07-12

2005-07-12

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090170, C074S56800M, C092S121000

Reexamination Certificate

active

06915767

ABSTRACT:
A method of determining the position of a cam phaser determines and stores an adaptively updated base offset corresponding to the phase offset of a camshaft relative to a crankshaft for a reference or default position of a cam phaser. Thereafter, the phaser position is determined relative to the base offset. Individual base offsets are preferably determined for each tooth of a toothed cam wheel, and stored in a non-volatile memory device. During engine operation, the base offsets are subject to diagnostic testing and adaptive updating, and the updated base offsets are stored in the non-volatile memory at engine shut-down.

REFERENCES:
patent: 6047674 (2000-04-01), Kadowaki et al.
patent: 6079381 (2000-06-01), Morikawa
patent: 6085706 (2000-07-01), Kadowaki et al.

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