A New Thermodynamic Model for Determination of Cylinder Volume Deformation and TDC Position

Thermodynamic models based on measured cylinder pressure versus crank angle are used to analyze the combustion characteristics in the internal combustion engine. The results of the thermodynamic models are inevitably error-prone. Therefore, in this paper, a new thermodynamic model under motoring conditions is developed for determination of parameters such as TDC position, offset in measured cylinder pressure, cylinder volume deformation and clearance volume. The model is validated using TDC position and offset in measured cylinder pressure obtained from experimental data. Accordingly, a satisfactory agreement is yielded between the results.