Exhaust gas recirculation type internal combustion engines and method of operating same

摘要

A multi-cylinder internal combustion engine is disclosed in which a portion of the exhaust gas is selectively added to each cylinder. The exhaust gas is caused to swirl along the inside wall of the cylinder. Air or a fuel/air mixture is caused to swirl in a central zone in the cylinder in the same direction of swirl as the direction of swirl of the exhaust gas thereby providing a stratified exhaust gas recirculation design.