Simultaneous Control of NOx, Soot and Fuel Economy of a Diesel Engine with Dual-loop EGR and VNT using Economic MPC

Zihao Liu; Arash Moradinegade Dizqah; Jose Martin Herreros; Joschka Schaub; Olivier Haas

doi:10.1016/j.conengprac.2020.104701

Simultaneous Control of NOx, Soot and Fuel Economy of a Diesel Engine with Dual-loop EGR and VNT using Economic MPC

Zihao Liu, Arash Moradinegade Dizqah, Jose Martin Herreros, Joschka Schaub, Olivier Haas

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

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Abstract

This paper proposes a nonlinear Economic Model Predictive Control (eMPC) strategy for the airpath management of diesel engines with dual-loop Exhaust Gas Recirculation (EGR) and Variable Nozzle Turbocharger (VNT). The controller directly controls the VNT and dual-loop EGR valves to simultaneously minimise NOx, soot and pumping loss. The novelty of this management strategy is to use a merged controller to replace a conventional combination of supervisory and tracking controllers, as well as eliminating the offline determination of the intake manifold pressure and cylinder oxygen concentration set points. The eMPC computes the set points online based on the engine operating condition, state feedback and the weightings of each economic objective, namely NOx, soot and fuel economy. The eMPC is simulated with an experimentally validated EURO 6 2L four-cylinder engine model. The performance of the eMPC is compared to a production controller over the Worldwide harmonised Light vehicles Test Cycles (WLTC). Compared to the production controller, the eMPC demonstrates NOx and soot emission reductions as well as improved torque tracking and fuel economy.

Original language	English
Article number	104701
Number of pages	10
Journal	Control Engineering Practice
Volume	108
Early online date	16 Dec 2020
DOIs	https://doi.org/10.1016/j.conengprac.2020.104701
Publication status	Published - Mar 2021

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Control Engineering Practice. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Control Engineering Practice, 108, (2021)
DOI: 10.1016/j.conengprac.2020.104701

© 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Funder

The research was funded by Coventry University, United Kingdom and supported by FEV GmbH who provided the proprietary engine model, the reference controller and problem domain expertise.

Keywords

Airpath Control
Nonlinear MPC
Economic MPC
Dual-loop EGR
VNT
Model predictive control
Airpath control
Model Predictive Control

ASJC Scopus subject areas

Applied Mathematics
Electrical and Electronic Engineering
Control and Systems Engineering
Computer Science Applications

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10.1016/j.conengprac.2020.104701

Post-PrintAccepted author manuscript, 4.87 MBLicence: CC BY-NC-ND

Cite this

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title = "Simultaneous Control of NOx, Soot and Fuel Economy of a Diesel Engine with Dual-loop EGR and VNT using Economic MPC",

abstract = "This paper proposes a nonlinear Economic Model Predictive Control (eMPC) strategy for the airpath management of diesel engines with dual-loop Exhaust Gas Recirculation (EGR) and Variable Nozzle Turbocharger (VNT). The controller directly controls the VNT and dual-loop EGR valves to simultaneously minimise NOx, soot and pumping loss. The novelty of this management strategy is to use a merged controller to replace a conventional combination of supervisory and tracking controllers, as well as eliminating the offline determination of the intake manifold pressure and cylinder oxygen concentration set points. The eMPC computes the set points online based on the engine operating condition, state feedback and the weightings of each economic objective, namely NOx, soot and fuel economy. The eMPC is simulated with an experimentally validated EURO 6 2L four-cylinder engine model. The performance of the eMPC is compared to a production controller over the Worldwide harmonised Light vehicles Test Cycles (WLTC). Compared to the production controller, the eMPC demonstrates NOx and soot emission reductions as well as improved torque tracking and fuel economy.",

keywords = "Airpath Control, Nonlinear MPC, Economic MPC, Dual-loop EGR, VNT, Model predictive control, Airpath control, Model Predictive Control",

author = "Zihao Liu and Dizqah, {Arash Moradinegade} and Herreros, {Jose Martin} and Joschka Schaub and Olivier Haas",

note = "NOTICE: this is the author{\textquoteright}s version of a work that was accepted for publication in Control Engineering Practice. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Control Engineering Practice, 108, (2021) DOI: 10.1016/j.conengprac.2020.104701 {\textcopyright} 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ ",

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AU - Schaub, Joschka

AU - Haas, Olivier

N1 - NOTICE: this is the author’s version of a work that was accepted for publication in Control Engineering Practice. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Control Engineering Practice, 108, (2021) DOI: 10.1016/j.conengprac.2020.104701 © 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

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AB - This paper proposes a nonlinear Economic Model Predictive Control (eMPC) strategy for the airpath management of diesel engines with dual-loop Exhaust Gas Recirculation (EGR) and Variable Nozzle Turbocharger (VNT). The controller directly controls the VNT and dual-loop EGR valves to simultaneously minimise NOx, soot and pumping loss. The novelty of this management strategy is to use a merged controller to replace a conventional combination of supervisory and tracking controllers, as well as eliminating the offline determination of the intake manifold pressure and cylinder oxygen concentration set points. The eMPC computes the set points online based on the engine operating condition, state feedback and the weightings of each economic objective, namely NOx, soot and fuel economy. The eMPC is simulated with an experimentally validated EURO 6 2L four-cylinder engine model. The performance of the eMPC is compared to a production controller over the Worldwide harmonised Light vehicles Test Cycles (WLTC). Compared to the production controller, the eMPC demonstrates NOx and soot emission reductions as well as improved torque tracking and fuel economy.

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Simultaneous Control of NOx, Soot and Fuel Economy of a Diesel Engine with Dual-loop EGR and VNT using Economic MPC

Abstract

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Keywords

ASJC Scopus subject areas

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