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research-article

DECENTRALIZED FEEDBACK CONTROL OF PUMPING LOSSES AND NOX EMISSIONS IN DIESEL ENGINES

[+] Author and Article Information
Rasoul Salehi

Powertrain Control Laboratory University of Michigan, Ann Arbor, MI, 48109
rsalehi@umich.edu

Jason Martz

Powertrain Control Laboratory University of Michigan, Ann Arbor, MI, 48109
jmartz@umich.edu

Anna G. Stefanopoulou

Powertrain Control Laboratory University of Michigan, Ann Arbor, MI, 48109
annastef@umich.edu

Bruce Vernham

ISUZU Technical Center of America Plymouth, MI, 48170
Bruce.Vernham@isza.com

Lakshmidhar Uppalapati

ISUZU Technical Center of America Plymouth, MI, 48170
Lakshmidhar.Uppalapati@isza.com

Bantwal Prashant Baliga

ISUZU Technical Center of America Plymouth, MI, 48170
BBprashant.Baliga@isza.com

1Corresponding author.

ASME doi:10.1115/1.4040008 History: Received March 01, 2018; Revised March 31, 2018

Abstract

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, Xcyl . The engine model is used for evaluating the designed controllers over the federal test procedure (FTP) for heavy duty vehicles. Results indicate that the control system meets all targets, namely fast air charge and Xcyl control during torque transients, robust NOx control during steady state operation and controlled pumping losses in all conditions.

Copyright (c) 2018 by ASME
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