System and method for predicting concentration of undesirable exhaust emissions from an engine
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United States of America Patent
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Nov 16, 2004
Grant Date -
Jul 22, 2004
app pub date -
Jan 17, 2003
filing date -
Jan 17, 2003
priority date (Note) -
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Abstract
A method for predicting the concentration of one or more undesirable exhaust emissions, such as NOx or HC, from an internal combustion engine. The method determines a mass flow (m.sub.(a)) of the charge of air supplied to the engine, the rotational speed (.omega.) of the engine, a fuel-equivalence ratio (.phi.) and an array of look-up tables to predict the concentration of the undesirable exhaust emissions. In some instances, the methodology employs an intermediate term to simply the relationship between the variables to achieve a corresponding simplification of the array of look-up tables. An engine control system that predicts the concentration of one or more undesirable exhaust emissions is also provided.
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