MTZ industrial

, Volume 4, Issue 2, pp 60–65 | Cite as

Firing Sequence Optimisation on a V20

  • Christoph Henninger
Research Engine Design

As the number of possible engine firing sequences grows disproportionately with the number of cylinders, an efficient assessment of firing sequences becomes complex. Swiss engine builder Liebherr has investigated both torsional and non-torsional criteria on a 20-cylinder diesel engine design. This article is based on a paper presented at the recent Torsional Vibration Symposium.

1 Crankshaft Loading

In internal combustion engines, besides the quasi-static bending and torsional load coming from cylinder pressure and mass forces, the crankshaft is subjected to a considerable dynamic load caused by torsional vibrations. Thus, an analysis of the cranktrain’s torsional dynamics has been common since the 1930s [1],[3],[6],[7]. Since then, the central role of the firing sequence of multi-cylinder engines on torsional excitation has been well known and understood. However, with steadily increasing specific output and cylinder peak pressures, in combination with higher numbers of cylinders,...


Torsional Vibration Intake Manifold Admissible Sequence Firing Sequence Main Bearing 
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.



The author would like to thank the Liebherr D96 project team for the intensive collaboration and various contributions.


  1. [1]
    Hafner, K.E; Maass, H.: Torsionsschwingungen in der Verbrennungskraftmaschine. Wien, 1985CrossRefGoogle Scholar
  2. [2]
    Maass, H.; Klier, H.: Kräfte, Momente und deren Ausgleich in der Verbrennungskraftmaschine. Wien, 1981CrossRefGoogle Scholar
  3. [3]
    Nestorides, E.J. (Ed.): A Handbook on Torsional Vibration. Cambridge, 1958zbMATHGoogle Scholar
  4. [4]
    Rønnedal, P.; Nielsen, H.B.: Firing Order Selection in Relation to Vibration Aspects. In: Proceedings of the Spring Technical Conference of the ASME Internal Combustion Engine Division, Salzburg, 2003, pp. 311—320Google Scholar
  5. [5]
    Scheuermeyer, M.: Einfluß der Zündfolge auf die Drehschwingungen von Reihenmotoren. Dissertation Technical University Munich 1932Google Scholar
  6. [6]
    Schrön, H.: Die Dynamik der Verbrennungskraftmaschine. Wien, 1947CrossRefGoogle Scholar
  7. [7]
    Wilson, W.K.: Practical Solution of Torsional Vibration Problems. London, 1935Google Scholar

Copyright information

© Springer Fachmedien Wiesbaden 2014

Authors and Affiliations

  • Christoph Henninger
    • 1
  1. 1.Liebherr Machines Bulle SABulleSwitzerland

Personalised recommendations