Supervisory controller for a LNT-SCR Diesel Exhaust After-Treatment System
Paper in proceedings, 2018

Statistical analysis of route history and online traffic information system can provide real-time look-ahead information regarding the route ahead which could be used for powertrain optimisation. A diesel engine NOx Exhaust After-Treatment System (EATS) for a passenger car application comprised of an engine close-coupled Lean NOx Trap (LNT) and an underfloor Selective Catalytic Reduction (SCR) is studied. Conventionally, the LNT-SCR operation is coordinated using a rule based controller that primarily utilises the SCR catalyst bed temperature. This paper presents a supervisory control structure that uses look ahead information to improve the performance of the EATS coordinator. Therefore, the supervisory control based EATS coordinator is parameterised with respect to the look ahead data. The parameterised controller calculates setpoints for the NOx EATS based on Emission Equivalent Fuel Consumption (EEFC). A simulation environment that has been validated with data from the production system was used to carry out the evaluation and compare against the baseline controller. The Supervisory control performance using the EEFC strategy is analysed for the Worldwide harmonized Light vehicles Test Cycle (WLTC). The paper explores a method to utilise a supervisory control structure for the EATS coordinator in an Engine Control Unit. Subsystem synergies that could be harnessed using the supervisory control approach are demonstrated for the EATS. The future work will focus on extending the approach to more subsystems and characterising the look ahead information.

Author

Dhinesh Velmurugan

Volvo Cars

Daniel Lundberg

Volvo Cars

Tomas McKelvey

Chalmers, Electrical Engineering, Signalbehandling och medicinsk teknik, Signal Processing

2018 European Control Conference, ECC 2018

1900-1907 8550256

16th European Control Conference, ECC 2018
Limassol, Cyprus,

MultiMEC- Multivariabla metoder för energieffektiv motorstyrning

VINNOVA, 2015-03-01 -- 2018-12-31.

Subject Categories

Other Mechanical Engineering

Control Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.23919/ECC.2018.8550256

More information

Latest update

1/28/2019