Combustion abnormality

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Combustion anomalies are anomalies , i.e. unusual processes, during combustion in combustion engines with internal combustion.

The best known combustion anomaly is " knocking " in a gasoline engine . Knock occurs when the air / fuel mixture in a gasoline engine is too compressed and the ignition (by the spark plug ) causes the pressure in the combustion chamber to rise to such an extent that the fuel / air mixture ignites at a point other than the spark plug becomes. The mixture then does not burn through the combustion chamber from the spark plug in all directions, but burns out from different points. The consequence of this are extreme pressure gradients in the combustion chamber, which place great stress on the engine parts and can therefore lead to damage.

Another combustion anomaly is pre-ignition in a gasoline engine. Pre-ignition occurs when the air / fuel mixture in a gasoline engine is so strongly compressed that the mixture ignites by itself due to the high pressure in the combustion chamber and the associated high temperature. The damaging effects are similar to those of knocking.

literature

• Richard van Basshuysen, Fred Schäfer: Handbook Internal Combustion Engine Basics, Components, Systems, Perspectives. 3rd edition, Friedrich Vieweg & Sohn Verlag / GWV Fachverlage GmbH, Wiesbaden, 2005, ISBN 3-528-23933-6