MTZ industrial

, Volume 4, Issue 2, pp 44–53 | Cite as

NOx control with cylinder pressure based engine control systems

  • Martin Greve
Development Engine Control

A reliable method of continuously determining NOx in engine exhaust gases would enable close compliance with emissions limits while maximising fuel efficiency. In the absence of suitable sensors for direct measurement, AVAT Automation uses cylinder pressure patterns as a basis for accurately estimating NOx formation.

NOx dilemma

Of the major constituents of internal combustion engine exhaust emissions, oxides of nitrogen (NOx) pose the greatest challenge, because NOx formation stands in inverse proportion to fuel consumption. This phenomenon finds expression in the “NOx-SFC trade-off” which, in simple terms, reflects the fact that the high combustion temperatures which result from complete, efficient combustion of fuel also result in the temperature peaks which favour NOx formation.

In an age of electronically controlled engines, a valuable tool for reducing NOx formation would be robust and reliable sensors for measuring NOxin engine exhausts. Their signals could be used as an input...


Nitric Oxide Cylinder Pressure Otto Cycle Indicate Mean Effective Pressure Engine Control System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Thanks go to the AiF Arbeitsgemeinschaft industrieller Forschungsvereinigungen for its support of the AVAT project in the framework of the technical development program Pro Inno II and to Dr. M. Birner and Prof. G. Wacht- meister of the LVK, Technische Universität München for their invaluable help.


  1. [1]
    CIMAC Working Group WG17 Gas Engines: Information about the use of LNG as engine fuel. Position paper, 2008Google Scholar
  2. [2]
    Eggers, J.; Greve, M.; Birner, M.; Wachtmeister, G.: Zylinderdruckbasierte Verbrennungsregelung für die Serie. 6th Dessau Gas Engine Conference, 2009Google Scholar
  3. [3]
    Sofke, S.; Eggers, J.; Greve, M.: Controlling NOx Emissions of Large Gas Engines based on In-Cylinder Pressure Measurement. CIMAC Congress, Bergen, 2010Google Scholar
  4. [4]
    Dohle, U.: Keynote Speech. 8th Dessau Gas Engine Conference, Dessau, 2013Google Scholar
  5. [5]
    Merker, G. P. et al.: Simulating Combustion. Heidelberg, Springer, 2006Google Scholar
  6. [6]
    CIMAC Working Group WG17 Gas Engines: Information about the influence on NOx emissions by ammonia in the fuel gas. Position paper, 2008Google Scholar
  7. [7]
    Heider, G.: Schadstoffbildung II. Abschlussbericht Vorhaben Nr.602. FVV, 1996Google Scholar
  8. [8]
    Zel’dovich, Y. B.: The Oxidation of Nitrogen in Combustion and Explosions. Acta Physiochimica 21, 1946Google Scholar
  9. [9]
    Baulch, D. L. et al.: Compilation of Rate Data for Combustion Modelling. Supplement I. J. Pys. Chem. Ref. Data 22, 1991Google Scholar
  10. [10]
    Pattas, K.; Hafner, G.: Stickoxidbildung bei der ottomotorischen Verbrennung. In: MTZ 34 (1973) No. 12., pp. 397–404Google Scholar
  11. [11]
    Ritscher, B.; Greve, M.: Caterpillar M46 Dual Fuel Engine with New Cylinder Pressure Based Control Strategies. CIMAC Congress, Shanghai, 2013Google Scholar

Copyright information

© Springer Fachmedien Wiesbaden 2014

Authors and Affiliations

  • Martin Greve
    • 1
  1. 1.Product Management Large Engine ControlsAVAT Automation GmbHTübingenGermany

Personalised recommendations