Cylinder Individual Efficiency Estimation for Online Fuel Consumption Optimization

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


Engine efficiency is often controlled in an indirect way through combustion timing control. This requires a priori knowledge of where to phase the combustion jiff 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.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Mechanical Engineering
Original languageEnglish
Title of host publicationProceedings Of The ASME Internal Combustion Engine Division Fall Technical Conference
PublisherAmerican Society Of Mechanical Engineers (ASME)
ISBN (Print)978-0-7918-4944-6
Publication statusPublished - 2010
Publication categoryResearch
EventFall Technical Conference of the ASME Internal Combustion Engine Division, 2010 - San Antonio, TX, San Antonio, TX, United States
Duration: 2010 Sep 122010 Sep 15


ConferenceFall Technical Conference of the ASME Internal Combustion Engine Division, 2010
CountryUnited States
CitySan Antonio, TX