INFLUENCE OF AUXILIARY INTAKE VALVE WITH VARIABLE TIMING ON SPARK IGNITION ENGINE PERFORMANCE

Ahmed, S.A.; Ibrahim, A. M.; Wassef, F. M.; Selim, H.

doi:10.21608/jesaun.2010.124378

INFLUENCE OF AUXILIARY INTAKE VALVE WITH VARIABLE TIMING ON SPARK IGNITION ENGINE PERFORMANCE

Document Type : Research Paper

Authors

¹ lecture assistant - Mechanical Engineering Department, Faculty of Engineering, Assiut University, 71516 Assiut

² Mechanical Engineering Department, Faculty of Engineering, Assiut University, 71516 Assiut

10.21608/jesaun.2010.124378

Abstract

A new variable valve timing strategy based on using an auxiliary valve having a variable timing (VVT) is used in this study. The valve is driven by a new VVT mechanism achieving valve duration and opening angle variations. The auxiliary valve acts as intake valve. Experiments and simulation models are carried out at different loads. The results show improvements in brake thermal efficiency, fuel consumption, volumetric efficiency, residual gas fraction and engine emissions over the whole range of load. Swirl and tumble ratios are decreased.

Main Subjects