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In today's automotive power train control, the usage of model based control system is getting more focused because of the advantages associated with this approach. The model-based system can be implemented to predict and control different control parameters associated with Power train control. As a part of this work a multivariable control oriented model is developed to control the inlet manifold airflow of a small S.I. engine running on Gas. A stepper motor-based actuator is placed on the gas flow control path. A model based controller approach is adopted to control the actuator, which is placed on the low-pressure tube with inlet manifold to control the gas flow. In the initial phase of work, a state based non-linear model is developed for the actuator. This model captures the total dynamics of a permanent magnet stepper motor-based flow control device in a state space model. Different parameters for the model are calculated using system identification methodology.