초록 ▼

A system and method for measuring and controlling cam timing of an internal combustion engine uses a filtering method based on a number of equally spaced teeth mounted on the camshaft. The filtering method specifically removes certain oscillations caused by camshaft torsional effects. The filtering

A system and method for measuring and controlling cam timing of an internal combustion engine uses a filtering method based on a number of equally spaced teeth mounted on the camshaft. The filtering method specifically removes certain oscillations caused by camshaft torsional effects. The filtering method also specifically removes oscillations due to production variations. These oscillations are removed with minimal effect on closed loop system response.

대표청구항 ▼

[ What is claimed is:] [1.] A method for measuring camshaft position of a variable position camshaft coupled to a crankshaft of an internal combustion engine, the method comprising:generating a first signal indicating crankshaft position;generating a second signal indicating camshaft position at a p

[ What is claimed is:] [1.] A method for measuring camshaft position of a variable position camshaft coupled to a crankshaft of an internal combustion engine, the method comprising:generating a first signal indicating crankshaft position;generating a second signal indicating camshaft position at a predetermined number of angular positions per revolution of the camshaft;calculating a current camshaft position relative to the crankshaft based on said first signal and said second signal; andcomputing a filtered camshaft position by filtering said current camshaft position with an averaging filter, with a number of averages based on said predetermined number of occurrences.