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Nonlinear model predictive engine airpath control with dual-loop exhaust gas recirculation and variable nozzle turbocharger

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posted on 2023-06-10, 04:41 authored by Zihao Liu, Arash Moradinegade DizqahArash Moradinegade Dizqah, Jose M. Herreros, Joschka Schaub, Olivier Haas
The control of engine airpath is a multi-objective tracking problem that aims to achieve a trade-off between emissions and fuel economy. Multiple control variables are simultaneously adjusted to accommodate both fast, slow and coupled nonlinear dynamics. This work proposes a Nonlinear Model Predictive Controller (NMPC) exploiting a convex and multi-rate prediction model to control in real-time the airpath of a compression ignition engine equipped with dual-loop Exhaust Gas Recirculation (EGR) and Variable Nozzle Turbocharger (VNT). Simulation studies and Hardware-in-the-Loop (HiL) implementation of the controller on a 480MHz ARM CortexA7 processor demonstrate reduced tracking error for intake manifold pressure and oxygen concentration by 12% and 21% respectively, whilst showing a 1% improvement in fuel economy. The control algorithm runs in real-time with both average and maximum computational time on HiL, being respectively 1.80 ms and 2.94 ms, below the required control interval of 10 ms.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

SAE International Journal of Engines

ISSN

0096-736X

Publisher

SAE

Issue

5

Volume

16

Department affiliated with

  • Engineering and Design Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2022-09-12

First Open Access (FOA) Date

2023-05-11

First Compliant Deposit (FCD) Date

2022-09-09

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