Increasing signal-to-noise ratio of spark-plug ion sensors through addition of salt-based fuel additives

S. Saxena, T. Dillstrom, J. Y. Chen, Robert Dibble

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Sensing ion production during the combustion of hydrocarbons is one way of detecting combustion time in homogeneous charge compression ignition (HCCI) engines. This process, however, is particularly difficult when low fuel concentrations typical of HCCI are used. For low equivalence ratios, distinguishing ion signal peaks from ambient noise is difficult, making ion sensors an unreliable means of performing combustion timing control. One strategy of increasing the ion signal magnitude is by including fuel additives, such as salt acetates, which produce greater numbers of ions during combustion. This paper discusses experimental research that quantifies the effects of adding different concentrations of salt acetates in fuels. Specifically for each concentration, the research examines the salt additive's effects on the ion signal, and the changes in intake conditions required to maintain fixed combustion times. Pure ethanol (EtOH) fuel is used as a starting point, and different amounts of potassium acetate (KOAc) are added. The goal is identification of the minimum KOAc concentration required under low equivalence ratios to produce ion signal magnitudes that are clearly distinguishable from background noise.

Original languageEnglish (US)
Title of host publicationFall Technical Meeting of the Western States Section of the Combustion Institute 2009, WSS/CI 2009 Fall Meeting
PublisherWestern States Section/Combustion Institute
Pages762-771
Number of pages10
ISBN (Electronic)9781615676507
StatePublished - Jan 1 2009
EventFall Technical Meeting of the Western States Section of the Combustion Institute 2009, WSS/CI 2009 - Irvine, United States
Duration: Oct 26 2009Oct 27 2009

Publication series

NameFall Technical Meeting of the Western States Section of the Combustion Institute 2009, WSS/CI 2009 Fall Meeting
Volume2

Other

OtherFall Technical Meeting of the Western States Section of the Combustion Institute 2009, WSS/CI 2009
CountryUnited States
CityIrvine
Period10/26/0910/27/09

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

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