Article | REF: BM2511 V1

Engine cycle modeling - Spark-ignition engines

Author: Philippe GUIBERT

Publication date: January 10, 2005, Review date: December 17, 2020

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1. Kinematic submodel describing the chamber volume

Cycle calculations will take into account variations in chamber volume and its derivative as a function of crankshaft angle. The classic connecting-rod-crank system is widely used in today's context, but a very special kinematics (piston movement) could be envisaged, for example with a movement that accentuates the maintenance of a constant volume around TDC over time.

In any case, crank-rod kinematics provides the following equations.

  • The chamber volume is expressed as :

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Kinematic submodel describing the chamber volume