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Experimental Investigation of a Hybrid Energy Storage System in an Engine Stop-Start Application

Neal, John
http://rave.ohiolink.edu/etdc/view?acc_num=osu1367432710

Abstract Details

2013, Master of Science, Ohio State University, Mechanical Engineering.
Through the last several years, the automotive industry has introduced many vehicles with some level of hybridization ranging from pure electric vehicles, to plug-in hybrids, what are now known as conventional hybrids, and finally micro-hybrids. The micro-hybrid is a vehicle that has no electric propulsion, however does present the ability to increase fuel economy by reducing engine idling time. This reduction is achieved through engine stop-start technologies implemented in different forms, while to functionality of automatically stopping the engine when the vehicle is at rest, and then re-starting the engine when the vehicle again needs to move. Some micro-hybrid vehicles used a conventional lead-acid (PbA) battery to provide the energy for the electrical accessories while the engine is off, and the power to then restart the engine. For aging or performance gains, it might be desirable to pair the PbA with a component better suited to delivering the power required to restart the engine, such as a Double Layer Capacitor (DLC), creating a Hybrid Energy Storage System (HESS). This work studies the performance and aging characteristics of a HESS compared to a conventional PbA battery in a stop-start application. This thesis presents an overview of the battery testing hardware and software developed at The Ohio State University Center for Automotive Research. Further, equivalent circuit models of the PbA battery, the Double Layer Capacitors (DLCs) used to implement the HESS for this work, and the HESS itself will be presented with validation data. Finally, this thesis concludes with a detailed discussion of the best practices for defining a testing protocol combined with the initial steps for implementing the protocol, an extensive analysis of the data collected with the observed results and conclusions. This work illustrates that the HESS will provide a more reliable and predictable starting event by consistently providing more power at a higher voltage than the PbA. Further, during the recovery, or engine-on period, of the aging cycle the HESS consistently requires less energy to return to a charged condition readying it for another engine off event faster than the PbA. Additionally, the data presented will show that when aged at very high temperatures, the batteries in the HESS and PbA degrade at approximately the same rate in terms of capacity loss and internal resistance growth, however; the evolution of the charging current distributions for the two ESS are quite different through time suggesting the aging is caused by different phenomena. Lastly, this work will argue the requirement for moving beyond a simple (passive) HESS and urge the implementation of and advanced HESS which will provide for active current management between the two components and potentially provide for better aging and performance characteristics than can be achieved via the simple HESS.
Yann Guezennec, Dr. (Advisor)
Marcello Canova, Dr. (Committee Member)
123 p.
Alternative Energy; Automotive Engineering; Electrical Engineering; Experiments; Mechanical Engineering
HESS; battery; PbA; aging; stop-start; hybrid

Recommended Citations

Citations

  • Neal, J. (2013). Experimental Investigation of a Hybrid Energy Storage System in an Engine Stop-Start Application [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1367432710

    APA Style (7th edition)

  • Neal, John. Experimental Investigation of a Hybrid Energy Storage System in an Engine Stop-Start Application. 2013. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1367432710.

    MLA Style (8th edition)

  • Neal, John. "Experimental Investigation of a Hybrid Energy Storage System in an Engine Stop-Start Application." Master's thesis, Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1367432710

    Chicago Manual of Style (17th edition)

osu1367432710
794
© 2013, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.