Sliding mode based powertrain control for efficiency improvement in series hybrid-electric vehicles

Metin Gokasan*, Seta Bogosyan, Douglas J. Goering

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

121 Citations (Scopus)

Abstract

This study involves the improvement of overall efficiency in series hybrid-electric vehicles (SHEVs) by restricting the operation of the engine to the optimal efficiency region, using a control strategy based on two chattering-free sliding mode controllers (SMCs). One of the designed SMCs performs engine speed control, while the other controls the engine/generator torque, together achieving the engine operation in the optimal efficiency region of the torque-speed curve. The control strategy is designed for application on a SHEV converted from a standard high mobility multipurpose wheeled vehicle (HMMWV) and simulated by using the Matlab-based PNGV Systems Analysis Toolkit (PSAT). The performance of the control strategy is compared with that of the original PSAT model, which utilizes PI controllers, a feedforward term for the engine torque, and comprehensive maps for the engine, generator and power converter (static only), which constitute the auxiliary power unit (APU). In this study, in spite of the simple modeling approach taken to model the APU and the optimal efficiency region, an improved performance has been achieved with the new SMC based strategy in terms of overall efficiency, engine efficiency, fuel economy, and emissions. The control strategy developed in this work is the first known application of SMC to SHEVs, and offers a simple, effective and modular approach to problems related to SHEVs.

Original languageEnglish
Pages (from-to)779-790
Number of pages12
JournalIEEE Transactions on Power Electronics
Volume21
Issue number3
DOIs
Publication statusPublished - May 2006

Funding

Manuscript received March 31, 2005; revised October 26, 2005. This work was supported by the U.S. Army’s Tank-Automotive and Armaments Command (TACOM), its Automotive Research Center (ARC) Program, the Yuma Proving Grounds, the Army’s Cold Regions Test Center (CRTC), and the NSF-CISE Program. Recommended by Associate Editor J. Shen.

FundersFunder number
Army’s Cold Regions Test Center
CRTC
NSF-CISE
U.S. Army
Automotive Research Center

    Keywords

    • Auxiliary power unit (APU)
    • Engine optimal efficiency operation
    • Series hybrid electric vehicles (HEVs)
    • Sliding mode controller (SMC)

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