Cylinder individual efficiency estimation for online fuel consumption optimization

Magnus Lewander*, Per Tunestål, Bengt Johansson

*Corresponding author for this work

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

2 Scopus citations

Abstract

Engine efficiency is often controlled in an indirect way through combustion timing control. This requires a priori knowledge of where to phase the combustion for different operating points and conditions. With cylinder individual efficiency estimation, control strategies aiming directly at fuel consumption optimization can be developed. This paper presents a method to estimate indicated efficiency using the cylinder pressure trace as input. The proposed method is based on a heat release calculation that takes heat losses into account implicitly using an estimated, CAD resolved polytropic exponent. Experimental results from a multi-cylinder engine show that with this approach, the estimated efficiency error is within 5% for all operating points tested. The final part of the paper is a discussion of how to use the efficiency estimation for feedback control. Different control concepts are presented as well as suggestions on how to handle the non-linear connection between combustion timing and indicated efficiency.

Original languageEnglish (US)
Title of host publicationASME 2010 Internal Combustion Engine Division Fall Technical Conference, ICEF2010
Pages627-634
Number of pages8
DOIs
StatePublished - Dec 1 2010
EventASME 2010 Internal Combustion Engine Division Fall Technical Conference, ICEF2010 - San Antonio, TX, United States
Duration: Sep 12 2010Sep 15 2010

Publication series

NameAmerican Society of Mechanical Engineers, Internal Combustion Engine Division (Publication) ICE
ISSN (Print)1066-5048

Other

OtherASME 2010 Internal Combustion Engine Division Fall Technical Conference, ICEF2010
CountryUnited States
CitySan Antonio, TX
Period09/12/1009/15/10

ASJC Scopus subject areas

  • Mechanical Engineering
  • Automotive Engineering

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