Autocalibration of camshaft phasing feedback in a variable...

Details Autocalibration of camshaft phasing feedback in a variable... Autocalibration of camshaft phasing feedback in a variable...

F - Mech Eng,Light,Heat,Weapons

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F01L 1/34 (2006.01) F02D 13/02 (2006.01) F02D 41/14 (2006.01)

Patent

CA 2063815

2063815 9101434 PCTABS00003 Autocalibration of the camshaft phasing sensor of a closed-loop variable valve timing system of an internal combustion engine. The camshaft phasing adjustment mechanism comprises a cam that changes the camshaft phasing. This cam is provided with a dwell that occurs at a known true phasing of the camshaft. The cam is commanded to operate to the dwell, and the lack of change in the sensor output indicates when the dwell is reached. At this time the sensor output should exactly indicate the known camshaft phasing that is produced by the adjustment cam dwell. If it does not, the difference is calculated and forms an offset that is algebraically applied to the sensor output thereby calibrating the sensor.

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