LQG Control for Minimization of Emissions in a Diesel Engine

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


The problem of minimizing emissions of NO. and soot in a diesel engine using fuel injection timings and exhaust gas recirculation (EGR) valve position in a low-pressure EGR system as control variables is addressed. Two feedback variables are computed from in-cylinder pressure sensor data, the crank angle degree of 50 % fuel burnt, and the ignition delay. Empirical maps of NO, and soot according to the feedback variables form the basis of a quadratic cost function in the feedback variables which is minimized by LQG control. For a multi-cylinder engine, the number of control variables will be less than the number of output variables to be controlled, and the consequences of this setup for the LQG controller is addressed. Experimental results verify the performance of the controller at a fixed operating point of a six-cylinder heavy-duty engine.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Mechanical Engineering
  • Control Engineering
Original languageEnglish
Title of host publication2008 IEEE International Conference on Control Applications, Vol1 and 2
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
ISBN (Print)978-1-4244-2222-7
Publication statusPublished - 2008
Publication categoryResearch
EventIEEE International Conference on Control Applications, 2008 - San Antonio, CA, United States
Duration: 2008 Sep 32008 Sep 5

Publication series

ISSN (Print)1085-1992


ConferenceIEEE International Conference on Control Applications, 2008
CountryUnited States
CitySan Antonio, CA

Related projects

Per Tunestål, Maria Henningsson & Rolf Johansson

Project: ResearchCollaboration with industry

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