Article | REF: BM2594 V1

Instantaneous angular speed fluctuations of thermal engines - Focus on 3-cylinder engine and comparison with 4-cylinder engine

Authors: Elian BARON, Jean-Louis LIGIER

Publication date: April 10, 2020

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6. Conclusion

This article focuses on the 3-cylinder in-line engine. A comparison is also made between 3-cylinder and 4-cylinder engines, as well as between gasoline and diesel engines. Finally, a solid-body model of the connecting rod is presented, along with a review of the inertias of the engine's main rotating parts.

The main concepts to be retained from this study are :

  • in-line 3-cylinder engine :

    • a rammer force exists, but only at order 6, and is limited in amplitude ;

    • the 3-cylinder engine does not generate sieves;

    • the galloping moment has a large amplitude, essentially linked to order 1. To attenuate this, it is relatively easy to balance the rotating masses;

    • the yawing moment is due solely...

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