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-"Multi-zone thermodynamic engine model" is a generic term adopted here for the type of model also referred to as quasi-dimensional, two-zone, three-zone, etc.; based on the laws of mass and energy conservation and using a mass burning rate sub-model (as opposed to a prescribed mass burning rate) to predict the in-cylinder pressure and temperature throughout the power cycle. Such models have been used for about three decades and provide valuable tools for rapid evaluation of the influence of key engine parameters. Numerous papers have been published on the development of models of varying complexity and their application. The current work is not intended as a comprehensive review of all these works, but presents an overview of multi-zone thermodynamic models for spark ignition engines, their pros and cons, the model equations and sub-models used to account for various processes such as turbulent wrinkling, flame development, flame geometry, heat transfer etc. It is suggested that some past terminology adopted to distinguish combustion models (e.g. "entrainment" versus "flamelet") is artificial and confusing; it can also be difficult to compare the different models used. Naturally, different models use varying underlying assumptions; however, the influence of several physical processes have frequently been incorporated into one term, not always well documented or clearly described.The authors propose a unified framework that can be used to compare different sub-models on the same basis, with particular focus on turbulent combustion models.Keywords: internal combustion engine, spark ignition, thermodynamic, modelling, simulation

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