A simplified Mean-Value Model (MVM) is developed to represent spark ignition engine functions. The model is based on variable valve phase angle over a wide range of operating conditions. Gas exchange dynamics is simulated to determine the mass air flow into the cylinder. This flow is altered by variable valve phase mechanism. In this paper, phasing the exhaust and intake valves is considered equally (dual equal) and is equipped with hydraulics Continuous Variable Valve Timing (CVVT) mechanism. The model developed reflects these modifications and uses gas exchange dynamics to capture valve phase, manifold pressure, and engine rotating speed. The values of flow rates from this simplified mathematical model is compared and validated with engine-dynamometer experimental data. The results show strong agreement in a wide range of operating points while the variation of phase angle is limited to nominal values.

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