An improved rate of heat release model for modern high speed diesel engines

Peter G. Dowell, Sam Akehurst, Richard D. Burke

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

2 Citations (SciVal)


To meet the increasingly stringent emissions standards, Diesel engines need to include more active technologies with their associated control systems. Hardware-in-the-Loop (HiL) approaches are becoming popular when the engine system is represented as a real-time capable model to allow development of the controller hardware and software without the need for the real engine system. This paper focusses on the engine model required in such approaches. A number of semi-physical, zerodimensional combustion modelling techniques are enhanced and combined into a complete model, these include- ignition delay, pre-mixed and diffusion combustion and wall impingement. In addition, a fuel injection model was used to provide fuel injection rate from solenoid energizing signals. The model was parameterized using a small set of experimental data from an engine dynamometer test facility and validated against a complete data set covering the full engine speed and torque range. The model was shown to characterize Rate of Heat Release (RoHR) well over the engine speed and load range. Critically the wall impingement model improved R2 value for maximum RoHR from 0.89 to 0.96. This reflected in the model's ability to match both pilot and main combustion phasing, and peak heat release rates derived from measured data. The model predicted indicated mean effective pressure and maximum pressure with R2 values of 0.99 across the engine map. The worst prediction was for the angle of maximum pressure which had an R2 of 0.74. The results demonstrate the predictive ability of the model, with only a small set of empirical data for training - this is a key advantage over conventional methods. The fuel injection model yielded good results for predicted injection quantity (R2=0.99), and enables the use of the RoHR model without the need for measured rate of injection.

Original languageEnglish
Title of host publicationASME 2016 Internal Combustion Engine Fall Technical Conference, ICEF 2016
Place of PublicationU. S. A.
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages16
ISBN (Electronic)9780791850503
Publication statusPublished - 1 Jan 2016
EventASME 2016 Internal Combustion Engine Fall Technical Conference, ICEF 2016 - Greenville, USA United States
Duration: 9 Oct 201612 Oct 2016


ConferenceASME 2016 Internal Combustion Engine Fall Technical Conference, ICEF 2016
Country/TerritoryUSA United States

Bibliographical note

Paper No. ICEF2016-9360


  • Combustion modelling
  • Ignition delay
  • Rate of heat release
  • Rate of injection

ASJC Scopus subject areas

  • Automotive Engineering
  • Mechanical Engineering
  • Fuel Technology


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