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ETD Abstract Container

Abstract Header

Coordinated control of the turbo electrically assisted variable geometry turbocharged diesel engine with exhaust gas recirculation

Glenn, Bradley Charles
http://rave.ohiolink.edu/etdc/view?acc_num=osu1127225590

Abstract Details

2005, Doctor of Philosophy, Ohio State University, Mechanical Engineering.
This work investigates the improvements in NOx emissions for a variable geometry turbo (VGT) charged diesel engine with exhaust gas recirculation (EGR) when electric assist is applied to the turbo-compressor. The method relies on selecting a fixed air to fuel ratio (AFR) above the no visible smoke limit that and regulating to that AFR. Simulated NOx emission results for the electrically assisted VGT engine w/ no EGR are first compared to a conventional VGT-EGR diesel engine. Then EGR control is added to the electrically assisted system and its influence on the electric assist system is studied. The control problem related to the complex gas exchange process in a Variable Geometry Turbocharged (VGT) diesel engine with Exhaust Gas Recirculation (EGR) has been proposed. The underlying assumptions regarding the sensor set to be used, however, are often not aligned with production intent goals for industrial applications. One such assumption is the availability of an exhaust gas pressure sensor. The exhaust gas pressure measurement is essential for the prediction of the flow rates over the EGR valve and the VGT vane. Additionally assumptions are often made regarding the availability of the air mass fraction in the intake and/or exhaust gas mixtures through a wide band oxygen sensor, commercially known as the Universal Exhaust Gas Oxygen (UEGO) sensor. While the appropriate sensors do exist, cost and reliability issues often force engine manufacturers and OEM’s to preclude one or more of these sensors from the production intent sensor set. It therefore becomes essential to find alternate means of predicting these state variables and control inputs. In order to circumvent the assumption that all the state variables and control inputs are available, observers for the exhaust manifold pressure and the air mass fractions in the in the intake, and exhaust manifolds are proposed. A mean value diesel engine model is used and the performance of the observers is validated against data from a 2.4L Fiat VGT-EGR diesel engine.
Gregory Washington (Advisor)
190 p.
Engineering, Mechanical
Diesel; Control; Observer

Recommended Citations

Citations

  • Glenn, B. C. (2005). Coordinated control of the turbo electrically assisted variable geometry turbocharged diesel engine with exhaust gas recirculation [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1127225590

    APA Style (7th edition)

  • Glenn, Bradley. Coordinated control of the turbo electrically assisted variable geometry turbocharged diesel engine with exhaust gas recirculation. 2005. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1127225590.

    MLA Style (8th edition)

  • Glenn, Bradley. "Coordinated control of the turbo electrically assisted variable geometry turbocharged diesel engine with exhaust gas recirculation." Doctoral dissertation, Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1127225590

    Chicago Manual of Style (17th edition)

osu1127225590
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© 2005, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.