Diesel engines fulfill diverse demands in urban and rural areas throughout the world. While the advantages of compression ignition engines are superior to other internal combustion engines in torque generation and fuel efficiency, some diesel exhaust emissions pose health and environmental problems. Emission reduction techniques generally diminish one type of tailpipe gas yet often sacrifice engine performance and may even raise other emission levels. For instance, exhaust gas recirculation can reduce NOx emissions. However, the dilution of the combustion charge with hot inert exhaust gas hinders the engine’s power characteristics. To solve this problem, an EGR cooler allows the exhaust gases to be cooled prior to mixing with intake air allowing a denser cylinder charge for combustion. The effective application of cooled EGR requires a smart thermal management system. In this paper, a real time empirical and analytical model will be introduced to estimate the diesel engine’s overall performance. The simplified model considers the engine’s combustion chemistry, as well as the thermal, emissions, and rotational dynamics. Representative numerical and experimental test results are presented and discussed to validate the model. Eventually, an on-board computer controller will use this model to regulate the EGR valve’s functionality and the smart thermal system.

Volume Subject Area:
Dynamic Systems and Control
Topics:
Automotive engines, Diesel engines, Thermal management, Emissions, Exhaust gas recirculation, Combustion, Exhaust systems, Diesel, Chemistry, Cities, Computers, Control equipment, Cylinders, Engines, Fuel efficiency, Gases, Internal combustion engines, Nitrogen oxides, Rotational dynamics, Thermal systems, Torque
1.
Asay, R., Svenson, K., and Tree, D., “An Empirical, Mixing-Limited, Zero-Dimensional Model for Diesel Combustion,” SAE paper no. 2004-01-0924, 2004.
2.
Bohac, S. V., Baker, D. M., and Assanis, D. N., “A Global Model for Steady State and Transient S.I. Engine Heat Transfer Studies,” SAE paper no. 960073, 1996.
3.
Eberth
 
J.
, and
Wagner
 
J.
, “
Emerging Trends in Vehicle Thermal Management
,”
ACTION Magazine
, Special Issue on Cooling and Heat Exchange, Mobile Air Condition Society (MACS) Worldwide, vol.
4
, no.
6
, pp.
14
–
15
, September/October,
2004
.
4.
Eberth, J., Wagner, J., Afshar, B., and Foster, R., “Modeling and Validation of Automotive ’Smart’ Thermal Management System Architectures,” SAE paper no. 2004- 01-0048, 2004.
5.
Heywood, J., Internal Combustion Engine Fundamentals, McGraw-Hill., New York, 1988.
6.
Honma, J., Murao, T., and Yamashita, Y. “Development of a Highly Efficient and Reliable Multi-Tube EGR Cooler,” SAE paper no. 2004-01-1446, 2004.
7.
Hong, S., Assanis, D., and Wooldridge, M., “Multi- Dimensional Modeling of NO and Soot Emissions with Detailed Chemistry and Mixing in a Direct Injection Natural Gas Engine,” SAE paper no. 2002-01-1112, 2002.
8.
Jung, D., and Assanis, D., “Multi-Zone DI Diesel Spray Combustion Model for Cycle Simulation Studies of Engine Performance and Emissions,” SAE paper no. 2001-01-1246, 2001.
9.
Norton, R., Design of Machinery, McGraw Hill, Boston, 2004.
10.
Rossini, F., Selected Values of Physical and Thermodynamic Properties of Hydrocarbons and Related Compounds, Carnegie Press, Pittsburgh, 1953.
11.
Setlur
 
P.
,
Wagner
 
J.
,
Dawson
 
D.
, and
Marotta
 
E.
, “
An Advanced Engine Thermal Management System: Nonlinear Control and Test
,”
IEEE/ASME Transactions on Mechatronics
, vol.
10
, no.
2
, pp.
11
11
,
2005
.
12.
UdayaKumar, R., and Anand, M, “Multizone Combustion Model for a Four Stroke Direct Injection Diesel Engine,” SAE paper 2004-01-0921, 2004.
13.
Visnic
 
B.
, “
Thermostat, Thy Days are Numbered
,”
Wards AutoWorld
, vol.
37
, no.
6
, pp.
53
–
54
,
2001
.
14.
Wagner, J., Marotta, E., and Paradis, I. “Thermal Modeling of Engine Components for Temperature Prediction and Fluid Flow Regulation,” SAE paper 2001-01-1014, 2001.
15.
Wagner
 
J.
,
Paradis
 
I.
,
Marotta
 
E.
, and
Dawson
 
D.
, “
Enhanced Automotive Engine Cooling Systems - A Mechatronics Approach
,”
International Journal of Vehicle Design
, vol.
28
, no.
1–3
, pp.
214
–
240
,
2002
.
16.
Wagner, J., Srinivasan, V., and Dawson, D., “Smart Thermostat and Coolant Pump Control for Engine Thermal Management Systems,” SAE paper no. 2003-01-0272, 2003.
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