Cyclic combustion variability in gasoline engines

R. Tily, C. J. Brace

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This paper presents an analysis of combustion data from a spark ignition engine running at a variety of mixture strengths at low speed and load conditions. In each case, the heat release per-cycle is studied using statistical tools and nonlinear time-series analysis techniques to illustrate the systematic variation of the combustion. Measures are presented here which aim to detect these variations at less severe operating conditions than have been previously reported, and which, in turn, enables their use in regions more representative of those experienced in production calibrations. It is shown that as mixture strength reduces from an A/F of 14.5 to 20.5 the degradation in combustion increases, as expected. More importantly, as the variability increases it begins to exhibit a systematic structure, which contains repeated sequences that suggest the presence of deterministic behaviour.

Original languageEnglish
Title of host publication Internal Combustion Engines: Performance, Fuel Economy and Emissions
PublisherInstitution of Mechanical Engineers
Pages111-120
Number of pages10
ISBN (Print)1843344513, 9781843344513
Publication statusPublished - 24 Sep 2008
EventInternal Combustion Engines: Performance, Fuel Economy and Emissions Conference - London, UK United Kingdom
Duration: 11 Dec 200712 Dec 2007

Publication series

NameInstitution of Mechanical Engineers: Combustion Engines and Fuels Group - Internal Combustion Engines: Performance, Fuel Economy and Emissions

Conference

ConferenceInternal Combustion Engines: Performance, Fuel Economy and Emissions Conference
CountryUK United Kingdom
CityLondon
Period11/12/0712/12/07

ASJC Scopus subject areas

  • Automotive Engineering
  • Mechanical Engineering

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