초록 ▼

Irregularities in crankshaft velocity introduced when measuring crankshaft rotation at a section of a crankshaft in an internal combustion engine that is less damped to torsional oscillations than is another more accessible crankshaft section are corrected by performing a nonlinear transformation vi

Irregularities in crankshaft velocity introduced when measuring crankshaft rotation at a section of a crankshaft in an internal combustion engine that is less damped to torsional oscillations than is another more accessible crankshaft section are corrected by performing a nonlinear transformation via a neural network to predict rotation measurements that would have been obtained at the inaccessible section from data actually collected at the accessible crankshaft section. Thus, the effects of torsional oscillations in the crankshaft are substantially filtered away, resulting in crankshaft acceleration values that form the basis of a misfire detector having nearly maximum signal-to-noise performance.

대표청구항 ▼

A method for obtaining corrected rotation quantities in a misfire detector for an internal combustion engine, said engine having a crankshaft with a first crankshaft section being damped with respect to torsional oscillations, said engine further having a crankshaft position sensor generating positi

A method for obtaining corrected rotation quantities in a misfire detector for an internal combustion engine, said engine having a crankshaft with a first crankshaft section being damped with respect to torsional oscillations, said engine further having a crankshaft position sensor generating position signals at predetermined rotational positions of said crankshaft, said crankshaft position sensor being juxtaposed with a second crankshaft section where torsional oscillations have a greater magnitude than at said first crankshaft section, said method comprising the steps of: measuring rotation quantities corresponding to individual cylinder events during operation of said engine; correcting said measured rotation quantities to remove periodic position irregularities; applying a nonlinear transform to said corrected measured rotation quantities to estimate acceleration values occurring at said first crankshaft section; and detecting misfire using said estimated rotation quantities.