Abstract

The method of computation is proposed to estimate NO emission levels of spark ignition engines operating with not only homogeneous but also nonhomogeneous mixtures, because mixture states other than a homogeneous one may deliberately be used to improve pollutant emissions and engine performance. First proposed is a model valid for homogeneous mixtures, and then it is so modified as to be applicable to various nonhomogeneous mixtures such as a stratified charge. These models allow us to survey the relation between NO emissions and the variations of mixture states or operating conditions in SI engines.

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