A novel decentralized control architecture is developed based on a feedback from the pressure difference across the engine which is responsible for the pumping losses and the exhaust gas recirculation (EGR) flow in diesel engines. The controller is supplemented with another feedback loop based on NOx emissions measurement. Aiming for simple design and tuning, the two control loops are designed and discussed: one manipulates the variable geometry turbine (VGT) actuator and the other manipulates the EGR valve. An experimentally validated mean-value diesel engine model is used to analyze the best pairing of actuators and set points. Emphasis is given to the robustness of this pairing based on gain changes across the entire operating region, since swapping the pairing needs to be avoided. The VGT loop is designed to achieve fast cylinder air charge increase in response to a rapid pedal tip-in by a feedforward term based on the real-time derivative of the desired boost pressure. The EGR loop relies on a feedback measurement from a NOx sensor and a real-time estimation of cylinder oxygen ratio, χcyl. The engine model is used for evaluating the designed controllers over the federal test procedure (FTP) for heavy duty (HD) vehicles. Results indicate that the control system meets all targets, namely fast air charge and χcyl control during torque transients, robust NOx control during steady-state operation, and controlled pumping losses in all conditions.
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October 2018
Research-Article
Decentralized Feedback Control of Pumping Losses and NOx Emissions in Diesel Engines
Rasoul Salehi,
Rasoul Salehi
Powertrain Control Laboratory,
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: rsalehi@umich.edu
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: rsalehi@umich.edu
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Jason Martz,
Jason Martz
Powertrain Control Laboratory,
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
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Anna Stefanopoulou,
Anna Stefanopoulou
Powertrain Control Laboratory,
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
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Bruce Vernham,
Bruce Vernham
ISUZU Technical Center of America,
Plymouth, MI 48170
Plymouth, MI 48170
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Lakshmidhar Uppalapati,
Lakshmidhar Uppalapati
ISUZU Technical Center of America,
Plymouth, MI 48170
Plymouth, MI 48170
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Bantwal Prashant Baliga
Bantwal Prashant Baliga
ISUZU Technical Center of America,
Plymouth, MI 48170
Plymouth, MI 48170
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Rasoul Salehi
Powertrain Control Laboratory,
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: rsalehi@umich.edu
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: rsalehi@umich.edu
Jason Martz
Powertrain Control Laboratory,
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
Anna Stefanopoulou
Powertrain Control Laboratory,
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
Department of Mechanical Engineering,
University of Michigan,
Ann Arbor, MI 48109
Bruce Vernham
ISUZU Technical Center of America,
Plymouth, MI 48170
Plymouth, MI 48170
Lakshmidhar Uppalapati
ISUZU Technical Center of America,
Plymouth, MI 48170
Plymouth, MI 48170
Bantwal Prashant Baliga
ISUZU Technical Center of America,
Plymouth, MI 48170
Plymouth, MI 48170
1Corresponding author.
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 1, 2018; final manuscript received March 31, 2018; published online June 25, 2018. Editor: David Wisler.
J. Eng. Gas Turbines Power. Oct 2018, 140(10): 102810 (9 pages)
Published Online: June 25, 2018
Article history
Received:
March 1, 2018
Revised:
March 31, 2018
Citation
Salehi, R., Martz, J., Stefanopoulou, A., Vernham, B., Uppalapati, L., and Prashant Baliga, B. (June 25, 2018). "Decentralized Feedback Control of Pumping Losses and NOx Emissions in Diesel Engines." ASME. J. Eng. Gas Turbines Power. October 2018; 140(10): 102810. https://doi.org/10.1115/1.4040008
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