All vehicle manufacturers implement an air-to-fuel ratio (AFR) control system for emissions reduction in gasoline engines. When using a model based control structure, it is vital to capture the underlying dynamics of the plant as accurately as possible, thus facilitating a robust control design that meets the emissions regulation requirements. One of the leading sources of uncertainty in the engine model is the variable plant delay. Although the delay could be modeled using a look-up table of steady-state delay values, during transients when AFR control is most important the steady-state delay poorly approximates the true delay. An exhaust geometry based delay model was developed previously within the framework of a model based control design for AFR control of stoichiometric engines. In this paper, it is shown that using this model the delay can be predicted with a significantly higher accuracy especially during transients, thus improving emissions performance. Because the plant delay plays a destabilizing role in feedback control, the utility of such a model is also to minimize phase errors between the predicted and measured equivalence ratio (EQR) in a reference tracking control setting.
ASME 2009 Dynamic Systems and Control Conference
October 12–14, 2009
Hollywood, California, USA
Conference Sponsors:
- Dynamic Systems and Control Division
ISBN:
978-0-7918-4892-0
PROCEEDINGS PAPER
Application of an Exhaust Geometry Based Delay Prediction Model to Internal Combustion Engines
Jason Meyer
,
Jason Meyer
Ohio State University, Columbus, OH
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Sai S. V. Rajagopalan
,
Sai S. V. Rajagopalan
Ohio State University, Columbus, OH
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Shawn Midlam-Mohler
,
Shawn Midlam-Mohler
Ohio State University, Columbus, OH
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Stephen Yurkovich
,
Stephen Yurkovich
Ohio State University, Columbus, OH
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Yann Guezennec
Yann Guezennec
Ohio State University, Columbus, OH
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Author Information
Jason Meyer
Ohio State University, Columbus, OH
Sai S. V. Rajagopalan
Ohio State University, Columbus, OH
Shawn Midlam-Mohler
Ohio State University, Columbus, OH
Stephen Yurkovich
Ohio State University, Columbus, OH
Yann Guezennec
Ohio State University, Columbus, OH
Paper No:
DSCC2009-2649, pp. 557-563; 7 pages
Published Online:
September 16, 2010
Citation
Meyer, Jason, Rajagopalan, Sai S. V., Midlam-Mohler, Shawn, Yurkovich, Stephen, and Guezennec, Yann. "Application of an Exhaust Geometry Based Delay Prediction Model to Internal Combustion Engines." Proceedings of the ASME 2009 Dynamic Systems and Control Conference. ASME 2009 Dynamic Systems and Control Conference, Volume 1. Hollywood, California, USA. October 12–14, 2009. pp. 557-563. ASME. https://doi.org/10.1115/DSCC2009-2649
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