NDLI: Modeling Cylinder-to-Cylinder Coupling in Multi-Cylinder HCCI Engines Incorporating Reinduction

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Anup, M. Kulkarni Gayatri, H. Adi Gregory, M. Shaver
Copyright Year	2007
Abstract	Residual-affected homogeneous charge compression ignition (HCCI) is a promising strategy for decreasing fuel consumption and NOx emissions in internal combustion engines. One practical approach for achieving residual-affected HCCI is by using variable valve actuation to reinduct previously exhausted combustion products. This process inherently couples neighboring engine cylinders as products exhausted by one cylinder may be reinducted by a neighboring one. In order to understand this coupling and its implication for controlling HCCI, this paper outlines a simple physics based model of a multi-cylinder HCCI engine using exhaust reinduction. It is based on a physics based model previously validated for a single cylinder, multi mode HCCI engine. The exhaust manifold model links exhaust gases from one cylinder to those of the other cylinders and also simulates the effect of exhaust reinduction from the previous cycle. Depending on the exhaust manifold geometry and orientation, the heat transfer in the manifold causes a difference in the temperature of the re-inducted product gas across the cylinders. The results show that a subtle difference in the re-inducted exhaust gas temperature results in a dramatic variation in combustion timing (approx. 3 degrees). This model provides a basis for understanding the steady state behavior and also for developing control strategies for multi-cylinder HCCI engines. The paper presents exhaust valve timing induced compression ratio modulation (via flexible valve actuation) as one of the approaches to mitigate the imbalance in combustion timing across cylinders.
Starting Page	1597
Ending Page	1604
Page Count	8
File Format	PDF
ISBN	0791843033
DOI	10.1115/IMECE2007-42487
e-ISBN	0791838129
Volume Number	Volume 9: Mechanical Systems and Control, Parts A, B, and C
Conference Proceedings	ASME 2007 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2007-11-11
Publisher Place	Seattle, Washington, USA
Access Restriction	Subscribed
Subject Keyword	Cycles Temperature Compression Valves Fuel consumption Combustion Homogeneous charge compression ignition engines Modeling Steady state Physics Exhaust systems Emissions Geometry Manifolds Gases Internal combustion engines Exhaust manifolds Nitrogen oxides Heat transfer Cylinders Engine cylinders
Content Type	Text
Resource Type	Article

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