Author(s)

K. Hall

Abstract

A low compression / high expansion ratio spark ignition engine strategy is proposed as a means of achieving ultra low exhaust emission vehicles using a low octane non carcinogenic fuel. Predicted fuel economy is better than a direct injection Diesel engine. Variable capacity capability by means of pulse valve control together with stratified charge mixture control determine the performance output via a fully balanced compact drive mechanism. 1. Introduction The thermal efficiency of automotive engines has been limited since their inception over a century ago by common compression and expansion ratios of fixed volume. Part load efficiency is limited with the Diesel engine due to friction resulting from high levels of compression work and with the spark ignition engine due to intake throttling. Essenti

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