Nonlinear MPC with emission control for a real-world off-highway diesel engine

Harder, Karsten; Buchholz, Michael; Niemeyer, Jens; Remele, Jörg; Graichen, Knut

doi:10.1109/aim.2017.8014274

Cited by 7 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…MPC also is capable of directly optimizing or constraining high-level/economic objectives such as emissions or fuel economy, these outputs are nonlinear and thus are usually addressed with NMPC. Controllers that maximize fuel economy subject to emissions constraints have been proposed for heavy duty diesels, 16,17 off-highway diesels, 18 and marine/generator diesels. 19 The associated simulation and experimental results are promising; however, these varieties of diesel engines are not subject to the same transient operating condition (speed/load) variations as automotive diesel engines.…”

Section: Introductionmentioning

confidence: 99%

Model predictive emissions control of a diesel engine airpath: Design and experimental evaluation

Liao‐McPherson

Huang

Kim

et al. 2020

Intl J Robust & Nonlinear

View full text Add to dashboard Cite

This article presents the development and experimental validation of an emissions oriented model predictive controller for a diesel engine. The control objective is to minimize cumulative NOx and hydrocarbon emissions while limiting visible smoke production and without compromising fuel economy or torque response. This is accomplished by using a supervisory model predictive controller (SMPC) and nonlinear model predictive controller (NMPC) in tandem. The SMPC controller coordinates the exhaust gas recirculation (EGR) rate target and fuel supplied to the engine in real time to satisfy combustion quality constraints, while the NMPC controller tracks the EGR rate target by manipulating the EGR throttle, EGR valve, and variable geometry turbine. The NMPC controller uses MPC for feedforward and feedback in a novel configuration to simultaneously achieve fast tracking performance, disturbance rejection, and robustness. We demonstrate that the proposed diesel engine MPC controller is able to reduce cumulative emissions by 10% to 15% relative to a state of the art benchmark strategy when placed in closed loop with an engine on a transient dynamometer.

show abstract

Section: Introductionmentioning

confidence: 99%

Model predictive emissions control of a diesel engine airpath: Design and experimental evaluation

Liao‐McPherson

Huang

Kim

et al. 2020

Intl J Robust & Nonlinear

View full text Add to dashboard Cite

show abstract

“…Models for the engine torque T E , maximum cylinder pressure p CM , particulate matter e PM , nitrogen oxides e NO x , and exhaust temperature ν EX were identified (see Harder et al 26 for details) based on the input…”

Section: Methodsmentioning

confidence: 99%

Hierarchical model predictive control for an off-highway diesel engine with SCR catalyst

Harder

Niemeyer

Remele

et al. 2023

International Journal of Engine Research

View full text Add to dashboard Cite

Diesel engines become more and more complex systems, especially due to increasingly restrictive emission laws. The selective catalytic reduction (SCR) is a promising way to lower nitrogen oxide emissions. The slow dynamics of the catalyst, however, have to be compensated by the engine, for example to comply with emission laws during transients. This work presents a bi-level nonlinear model predictive control (MPC) concept for a diesel engine with an upper MPC layer to account for the SCR catalyst and a lower MPC layer to control the engine. The resulting hierarchical MPC structure is able to solve the overall control problem in real-time on ECU level using suitable MPC formulations as well as interconnecting variables. The numerical solution is based on an augmented Lagrangian MPC algorithm and control-oriented models. Simulation results against a detailed reference model of the overall system demonstrate the high performance of the hierarchical MPC concept.

show abstract

“…Another crucial performance metric, NOx emissions performance, is also demanded by federal regulations. Many of the existing literature considers a pre-defined fixed drive cycle, and uses variable geometry turbocharger (VGT), exhaust gas recirculation (EGR) techniques, and airpath controllers to improve fuel efficiency and reduce feedgas emissions for diesel engines, for example, by minimizing brake-specific fuel consumption (BSFC) 20,21 , by reducing pumping loss 22,23 , or by engine safety constraints and optimize the EGR rate tracking performance 24 . Under such circumstances, a trade-off between fuel consumption and engine emissions arises, as the engine operation conditions that are fuel efficient do not fully overlap with those that generate low NOx.…”

Section: Introductionmentioning

confidence: 99%

Hardware-in-the-loop exploration of energy versus emissions trade-off in eco-following scenarios for connected automated vehicles

Huang

Salehi

Stefanopoulou

et al. 2022

International Journal of Engine Research

View full text Add to dashboard Cite

Studies on eco-driving have mostly taken an energy-centric view and considered driving performance, while less attention has been paid on emissions behavior. This work extends in an experimentally verified way our understanding of the trade-offs among fuel economy, driving aggressiveness, and, especially, emissions in connected automated diesel-powered vehicles. Experiments are performed with a 6.7-L Ford Powerstroke diesel engine, a urea-SCR based NOx aftertreatment system, and a full model for a Ford F250 medium-duty truck in the loop to provide realistic assessment of fuel consumption, tailpipe emissions, and driving style performances. An energy and emissions conscious speed planner is leveraged to follow the traffic. This planner offers flexibility in prioritizing energy or emissions while satisfying user-defined headway constraints, and thus allows exploration of different calibrations in a unified way. Results show how various calibrations of the flexible leader following policy yield 8%–14% decrease in total fuel consumption and 64%–70% decrease in tailpipe emissions compared with a strictly constrained following policy.

show abstract

Nonlinear MPC with emission control for a real-world off-highway diesel engine

Cited by 7 publications

References 7 publications

Model predictive emissions control of a diesel engine airpath: Design and experimental evaluation

Model predictive emissions control of a diesel engine airpath: Design and experimental evaluation

Hierarchical model predictive control for an off-highway diesel engine with SCR catalyst

Hardware-in-the-loop exploration of energy versus emissions trade-off in eco-following scenarios for connected automated vehicles

Contact Info

Product

Resources

About