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Research Papers: Internal Combustion Engines

Modeling of Compressed Air Hybrid Operation for a Heavy Duty Diesel Engine

[+] Author and Article Information
Xiaoyong Wang

Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA 90095

Tsu-Chin Tsao1

Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA 90095ttsao@seas.ucla.edu

Chun Tai, Hyungsuk Kang

 Volvo Powertrain North America, Hagerstown, MD 21742

Paul N. Blumberg

 Consultant, Southfield, MI 48034

Developed by National Renewable Energy Laboratory, U.S. DOE.

1

Corresponding author.

J. Eng. Gas Turbines Power 131(5), 052802 (May 26, 2009) (8 pages) doi:10.1115/1.3078788 History: Received August 17, 2008; Revised August 27, 2008; Published May 26, 2009

This paper presents the analysis and modeling of a 10.8 l heavy-duty diesel engine modified for operating compressed air hybrid engine cycles. A lumped parameter model is developed to first investigate the engine cylinder-air tank mass and energy interaction. The efficiency of compressed air energy transfer is defined based on the second law of thermodynamics. A high fidelity model is developed using commercially available software (GT-POWER ) to capture the effects of engine friction, heat transfer, gas dynamics, etc. Engine valve timing for optimal efficiency in air regeneration and the corresponding engine speed-torque maps are established using the detailed engine model. The compressed air hybrid engine maps are then incorporated into vehicle simulation (ADVISOR ) to evaluate the potential fuel economy improvement for a refuse truck under a variety of driving cycles. Depending on the particular driving cycle, the simulation has shown a potential 4–18% fuel economy improvement over the truck equipped with the conventional baseline diesel engine.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 3

Cylinder-tank model

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Figure 4

MD11 air hybrid configuration

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Figure 5

Camless intake and exhaust valve profiles

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Figure 6

Tank pressure versus engine cycles

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Figure 7

AC efficiency versus engine cycles

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Figure 8

P-V diagrams of last cycle

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Figure 9

EVO (unit: deg) map for AC 900 rpm

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Figure 10

Efficiency map (unit: %) for AC 900 rpm

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Figure 11

IVO (unit: deg) map for AM 900 rpm

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Figure 12

Efficiency (unit: %) map for AM 900 rpm

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