A comprehensive physics-based model for medium-duty diesel engine with exhaust gas recirculation

Alok A. Joshi, Scott James, Peter Meckl, Galen King, Kristofer Jennings

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

2 Scopus citations

Abstract

Physics-based models of diesel engines with exhaust gas recirculation and a variable geometry turbine (EGR/VGT) have been developed extensively in the control system design community. However, these models omit the heat transfer effects of the charge-air cooler and the recirculated exhaust gas cooler in order to avoid the added complexity in model order for online implementation. Generally, there is no need to include these effects if the purpose of the model is to control the target variables, such as boost pressure and air-to-fuel ratio. In this paper, after surveying the existing state of physics-based models for the EGR/VGT subsystem, a comprehensive model of the EGR/VGT subsystem is developed. This model includes heat transfer effects in the coolers, pressure drops across air filters and pipes, and mass flow rate calculations for a variable geometry turbine and an exhaust gas recirculation control valve. The purpose and scope of this work is offline modeling-for-diagnostics. Such models, though complex, will assist in the fault sensitivity analysis of a subsystem while avoiding any destructive testing when a major design modification in the EGR/VGT subsystem is proposed. For example, the impact of charge-water or EGR cooler degradation on the boost pressure and the air-to-fuel ratio can be studied with such models to further help in designing diagnostic reasoning strategies. Simulation performed using the proposed physics-based model demonstrates a dominant failure effect of an EGR cooler coolant leak over a charge-water cooler water leak on the properties of the intake air.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE 2007
Pages139-148
Number of pages10
DOIs
StatePublished - Jun 2 2008
EventASME International Mechanical Engineering Congress and Exposition, IMECE 2007 - Seattle, WA, United States
Duration: Nov 11 2007Nov 15 2007

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings
Volume16

Other

OtherASME International Mechanical Engineering Congress and Exposition, IMECE 2007
CountryUnited States
CitySeattle, WA
Period11/11/0711/15/07

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ASJC Scopus subject areas

  • Engineering(all)
  • Mechanical Engineering

Cite this

Joshi, A. A., James, S., Meckl, P., King, G., & Jennings, K. (2008). A comprehensive physics-based model for medium-duty diesel engine with exhaust gas recirculation. In Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE 2007 (pp. 139-148). (ASME International Mechanical Engineering Congress and Exposition, Proceedings; Vol. 16). https://doi.org/10.1115/IMECE2007-42119