High fidelity engine model for a unified control, diagnostic and condition monitoring framework

A new unified framework for control, diagnostic and condition monitoring is proposed for gasoline engines. This framework can help in cylinder to cylinder control, diagnostics and aging analysis of engine and its components and raises a need of high fidelity control oriented model for gasoline engine. Therefore, a high fidelity model utilizing the spatial configuration, the first principle engine model based on Lagrangian dynamics is also proposed. It is derived by applying the Constrained Lagrangian Equation of Motion to torque producing mechanism of an I-type four cylinder gasoline engine. The mathematical model is simplified, such that it is easily integrated with the flow dynamics of the intake manifold. Furthermore, the model is tuned and validated on a 1.3L four cylinder gasoline engine. Salient model features like crankshaft angular speed fluctuations and tensions in the engine components are also demonstrated that can help in developing the proposed unified framework.