Supervisory control for emission compliance of heavy-duty vehicles
It is a challenge to fulfil the current emission legislation—especially real-driving NOX emission legislation—with existing control functionalities in the engine management system (EMS). However, better control of NOX emission is possible by exploiting predictive driving information and considering the coupling between the engine system and EATS. This work pursues this idea and concludes that fulfilling real-driving NOX emission legislation is possible, considering the coupling between the engine system and EATS while using predictive information. The work provides a mathematical formulation of the concept and then develops, evaluates, and implements an engine-EATS supervisor which optimizes total fuel consumption and fulfils both the world harmonized transient cycle (WHTC) based and real-driving NOX emission legislation. The developed supervisor is a distributed economic nonlinear model predictive controller (E-NMPC). This work develops and analyzes two different versions of the distributed E-NMPC based supervisory control algorithm. The more efficient one of the two is again compared for three variants. Considering the computation time of the three algorithms and processing speed of the existing EMS, one algorithm is selected for implementation.
The supervisor performs much better compared to a baseline controller (optimized offline). Simulation results show that the supervisory controller has 1.7% less total fuel consumption and 88.4% less NH3 slip, compared to the baseline controller, to achieve the same real-driving NOX emission.
Euro VI emission legislation
exhaust aftertreatment system
Pontryagin’s minimum principle
Mohammed Razaul Karim
Chalmers, Elektroteknik, System- och reglerteknik, Reglerteknik
Supervisory Control for Real-Driving Emission Compliance of Heavy-Duty Vehicles
IFAC-PapersOnLine,; Vol. 51(2018)p. 460-466
Artikel i vetenskaplig tidskrift
Supervisory Framework and Model-based Control of Engine and Exhaust Aftertreatment System
2018 European Control Conference, ECC 2018,; (2018)p. 959-964
Paper i proceeding
Mohammed R. Karim, Bo Egardt, Esteban R. Gelso, and Nikolce Murgovski, "Supervisory Control for NOx Emission Compliance of Heavy-Duty Vehicles."
Chalmers tekniska högskola
Opponent: Lars Eriksson