Research and Development of the Honda CVCC Engine

This paper summarizes some of the technical considerations upon which Honda's CVCC system is based, relating to reduction of pollutants in automobile engine exhaust gases.

The CVCC engine employs a stratified charge to produce stable combustion of an overall lean mixture. A unique mixture is formed immediately before ignition to reduce three pollutants (CO, HC, and NO_x) simultaneously, as well as to improve fuel economy. This mixture is produced by contolling fuel mixtures supplied to the engine and by geometrical combustion chamber design features.

An evaluation model conceived by Honda to evaluate emissions and fuel economy during the driving cycle mode is explained, and a comparison of estimated values obtained from the evaluation model with those obtained under actual driving test conditions is made.