Abstract
In this paper a model of the air flow and pressure inside the intake manifold of spark ignition engines is derived from mass and momentum balance equations. The model is capable to predict the physical phenomena inside the engine cycle. Linearization around a nominal point derived from a Mean Value Model allows to determine the tranfer functions relating the throttle angle variation and the poppet valve lift to pressure and air flow in the manifold. The knowledge of these tranfer functions can be the starting point for the design of more accurate pressure control schemes.
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