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Research Papers: Internal Combustion Engines

Integration of a Dual-Mode SI-HCCI Engine Into Various Vehicle Architectures

[+] Author and Article Information
Benjamin J. Lawler

e-mail: blawler@umich.edu

Zoran S. Filipi

W. E. Lay Automotive Laboratory,
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109

1Zoran Filipi is currently the Timken Endowed Chair in Vehicle System Design at Clemson University’s ICAR, but was employed by the University of Michigan when this work was conducted.

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received May 18, 2012; final manuscript received October 10, 2012; published online April 23, 2013. Assoc. Editor: Song-Charng Kong.

J. Eng. Gas Turbines Power 135(5), 052802 (Apr 23, 2013) (8 pages) Paper No: GTP-12-1125; doi: 10.1115/1.4022990 History: Received May 18, 2012; Revised October 10, 2012

A simulation study was performed to evaluate the potential fuel economy benefits of integrating a dual-mode SI-HCCI engine into various vehicle architectures. The vehicle configurations that were considered include a conventional vehicle and a mild parallel hybrid electric vehicle. The two configurations were modeled and compared in detail for a given engine size (2.0 L) over the EPA UDDS (city) and highway cycles. The results show that the dual-mode engine in the conventional vehicle offers a modest gain in vehicle fuel economy of approximately 5–7%. The gains were modest because the baseline (the SI engine in the conventional vehicle) is relatively advanced with a six-speed automated manual transmission. The mild parallel hybrid with the SI engine achieved 32% better fuel economy than the conventional vehicle in the city, but only 6% on the highway. For the dual-mode engine in the mild parallel hybrid, a specific control strategy was used to manipulate engine operation in an attempt to minimize the number of engine mode transitions and maximize the time spent in HCCI. The parallel hybrid with the dual-mode engine and modified control strategy provides dramatic improvements of up to 48% for city driving, demonstrating that the addition of HCCI has a more significant impact with mild parallel hybrids than with conventional vehicles. Finally, a systematic study of engine sizing provides guidelines for selecting the best option for a given vehicle application.

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Figures

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Fig. 1

(a) SI and (b) dual-mode BSFC maps [12]

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Fig. 2

Qualitative schematic of the control modes in the e-HCCI control strategy [10]

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Fig. 3

Control mode diagram over engine BSFC map

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Fig. 4

Diagram of mode-shift buffer regions

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Fig. 5

(a) Motor scaling factor versus SOC and (b) the effect of the motor scaling factor on the control mode diagram

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Fig. 6

(a) Best-BSFC lines for the SI and dual-mode engines and (b) the resulting shift schedule with driveability considerations

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Fig. 7

(a) Best-BSFC lines and line altered for hybrid considerations, and (b) parallel hybrid configuration shift schedule

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Fig. 8

Engine operating points for the 2.0 L dual-mode engine in (a) the conventional vehicle and (b) the mild parallel hybrid over the EPA UDDS cycle

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Fig. 9

Comparison of fuel economy for the four configurations (a) for the UDDS cycle and (b) for the highway cycle

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Fig. 10

Normalized (a) city and (b) highway fuel economy for all configurations over an engine displacement sweep

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Fig. 11

Absolute (a) city and (b) highway fuel economy for all configurations as a function of engine displacement

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