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The thermal effect of internal exhaust gas recirculation on controlled auto ignition

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conference contribution
posted on 25.05.2011 by Rui Chen, Nesa Milovanovic, J.W.G. Turner, D. Blundell
Controlled Auto Ignition (CAI) uses compression heat to auto ignite a homogeneous air/fuel mixture. Using internal exhaust gas recirculation (IEGR) as an indirect control method, CAI offers superior fuel economy and pollutant emission reductions. Practically, this can readily be achieved by a method of early exhaust valve closure and late inlet valve opening to trap exhaust gas residuals within the cylinder from one cycle to the next. In order to understand the combustion mechanism, we did a comprehensive investigation on CAI fuelled with isooctane. Test data was gathered from a single cylinder research engine equipped with Lotus’ Research Active Valve Train (AVT) System, and the modelling study was based on detailed chemical kinetics. It was found that CAI can only occur when the thermal energy of the engine charge, which is a mixture of air / fuel and IEGR, reaches a certain level. This thermal energy is inherited from IEGR trapped inside the cylinder from the previous combustion cycle, when the air / fuel fresh charge was supplied at ambient conditions.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Citation

CHEN, R. ... et al, 2003. The thermal effect of internal exhaust gas recirculation on controlled auto ignition. IN: Proceedings of SAE 2003 World Congress, Detroit, USA, 3rd-6th March.

Publisher

© SAE International

Version

VoR (Version of Record)

Publication date

2003

Notes

This is a conference paper [2003 © SAE International]. It was posted on this site with permission from SAE International. Further use and distribution of this paper requires permission from SAE International.

ISSN

0148-7191

Book series

SAE Technical Papers;2003-01-0751

Language

en

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