2016 SAE - Modelling the Exhaust Gas Recirculation Mass Flow Rate in Modern Diesel Engines.pdf (3.47 MB)
Download file

Modelling the exhaust gas recirculation mass flow rate in modern diesel engines

Download (3.47 MB)
conference contribution
posted on 10.03.2017, 09:17 by Zhijia YangZhijia Yang, Edward WinwardEdward Winward, Gary O'Brien, Richard Stobart, Dezong Zhao
The intrinsic model accuracy limit of a commonly used Exhaust Gas Recirculation (EGR) mass flow rate model in diesel engine air path control is discussed in this paper. This EGR mass flow rate model is based on the flow of a compressible ideal gas with unchanged specific heat ratio through a restriction cross-area within a duct. A practical identification procedure of the model parameters is proposed based on the analysis of the engine data and model structure. This procedure has several advantages which include simplicity, low computation burden and low engine test cost. It is shown that model tuning requires only an EGR valve sweep test at a few engine steady state operating points. It is also shown that good model accuracy can be achieved when the control variables of other air path devices, e.g. The vane position of a Variable Geometry Turbocharger (VGT) and the torque demand of an Electric Turbo Assist (ETA), are kept constant during the EGR valve sweep test used to tune the model. Two different diesel engines are used in this work to demonstrate the model tuning procedure and the model validation results. Both engines are equipped with a high pressure external EGR system and a VGT. One of the engines has a relatively new air system device - an ETA. The model validation results of both engines show good model accuracy not only at steady state engine operating points but also during engine transients.

Funding

The authors would like to gratefully acknowledge the UK Engineering and Physical Sciences Research Council (EPSRC) for funding this research work under Grant Number: EP/K026658/1.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

SAE Congress SAE Technical Papers

Volume

2016-April

Issue

April

Citation

YANG, Z. ... et al, 2016. Modelling the exhaust gas recirculation mass flow rate in modern diesel engines. SAE World Congress and Exhibition 2016, Detroit, USA, SAE Technical Paper 2016-01-0550, doi:10.4271/2016-01-0550.

Publisher

© SAE International

Version

VoR (Version of Record)

Acceptance date

10/11/2015

Publication date

2016

Notes

Reprinted with permission SAE Copyright © 2017 SAE International. Further distribution of this material is not permitted without prior permission from SAE.

ISSN

0148-7191

Book series

SAE Technical Paper;2016-01-0550

Language

en

Location

Detroit, USA