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Research Papers: Internal Combustion Engines

Computationally Efficient Whole-Engine Model of a Cummins 2007 Turbocharged Diesel Engine

[+] Author and Article Information
Anup M. Kulkarni

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47909

Gregory M. Shaver1

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47909gshaver@purdue.edu

Sriram S. Popuri

 Cummins Tech Center, Columbus, IN 47201sriram.s.popuri@cummins.com

Tim R. Frazier

 Cummins Tech Center, Columbus, IN 47201tim.r.frazier@cummins.com

Donald W. Stanton

 Cummins Tech Center, Columbus, IN 47201donald.w.stanton@cummins.com

1

Corresponding author.

J. Eng. Gas Turbines Power 132(2), 022803 (Nov 02, 2009) (9 pages) doi:10.1115/1.3125316 History: Received September 12, 2008; Revised January 01, 2009; Published November 02, 2009; Online November 02, 2009

This paper describes an accurate, flexible, and computationally efficient whole engine model incorporating a multizone, quasidimension combustion submodel for a 6.7-l six-cylinder turbocharged diesel engine with cooled exhaust gas recirculation (EGR), cooled air, and multiple fuel injections. The engine performance and NOx emissions predicative capability of the model is demonstrated at 22 engine operating conditions. The only model inputs are physical engine control module “control actions,” including injection rates, injection timings, EGR valve position, and variable geometry turbocharger rack position. The model is run using both “open” and “closed” loop control strategies for air/EGR path control, in both cases achieving very good correlation with experimental data. Model outputs include in-cylinder pressure and heat release, torque, combustion timing, brake specific fuel consumption, EGR flow rate, air flow rate, exhaust and intake pressure, and NOx emissions. The model predicts engine performance and emissions with average absolute errors within 5% and 18%, respectively, of true values with “open-loop” air/EGR control, and within 5% and 11% with “closed-loop” air/EGR control. In addition, accurate prediction of the coupling of the in-cylinder combustion and emission-production processes with the boosted, cooled air/EGR gas dynamics is a key characteristic of the model.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Spray model in DI-jet

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Figure 2

Air entrainment and mixing within each zone

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Figure 3

Engine schematic. actuators noted with dashed lines

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Figure 4

Engine torque-speed map with the operating region for calibration

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Figure 5

Normalized apparent heat release rate for four representative cases spanning NTE region, see Fig. 4

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Figure 6

Prediction for volumetric efficiency (%), ● open-loop, and × closed-loop

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Figure 7

Prediction for EGR fraction (%), ● open-loop, and × closed-loop

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Figure 8

Prediction for NOx (ppm), ● open-loop, and × closed-loop. Note: actual values are suppressed due to confidentiality.

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Figure 9

Prediction for intake manifold temperature (deg F), ● open-loop, and × closed-loop

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Figure 10

Prediction for net indicated mean effective pressure, ● open-loop, and × closed-loop. Note: actual values are suppressed due to confidentiality.

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