A Control-oriented Model Identification for Air Path System of Diesel Engines

In this paper, an air path model of diesel engine is developed, parameterized, and validated. In order to promote the design of model-based control techniques, such as model-predictive control for modern diesel engine, it is important to establish a control-oriented model that can describe the gas mass flow dynamics including the dynamics of the pressure of intake and exhaust manifold and the turbocharger. Through the analysis of the structure of air path system, a simplied model with three states is obtained. Using the real-time data from diesel engine test bench, we estimate several submodels parameters by adopting the least square optimization. Calculating the relative error between estimated parameters and corresponding measured one verify the accuracy of the model.