Abstract
A variable valve timing (VVT) mechanism was applied to control premixed diesel ignition and combustion at higher load for low emissions and high thermal efficiency in a light duty diesel engine. By means of late intake valve closing, compressed gas temperature near the top dead center could be lowered, thereby increasing ignition delay to enhance fuel-air mixing. The variability of effective compression ratio has a significant potential tor controlling ignition timing of premixed charge. The VVT mechanism combined with EGR and a supercharging system could simultaneously reduce NOx, smoke and maximum combustion pressure of premixed diesel combustion at higher exhaust gas temperature.
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