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Journal of Chemistry
Volume 2015, Article ID 765083, 11 pages
http://dx.doi.org/10.1155/2015/765083
Research Article

Research on Control-Oriented Modeling for Turbocharged SI and DI Gasoline Engines

1College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
2College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
3Lifan Passenger Vehicle Company Limited, Chongqing 401122, China

Received 9 January 2015; Accepted 26 February 2015

Academic Editor: Ming Huo

Copyright © 2015 Feitie Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In order to analyze system performance and develop model-based control algorithms for turbocharged spark ignition and direct injection (SIDI) gasoline engines, a control oriented mean value model is developed and validated. The model is constructed based on theoretical analysis for the different components, including the compressor, turbine, air filter, intercooler, throttle, manifold, and combustion chamber. Compressor mass flow and efficiency are modeled as parameterized functions. A standard nozzle model is used to approximate the mass flow through the turbine, and the turbine efficiency is modeled as a function of blade speed ratio (BSR). The air filter is modeled as a tube for capturing its pressure drop feature. The effectiveness number of transfer units (NTU) modeling method is utilized for the intercooler. The throttle model consists of the standard nozzle model with an effective area regressed to throttle position. Manifolds are modeled for their dynamically varying pressure state. For the cylinder, the air mass flow into cylinders, fuel mass, torque, and exhaust temperature are modeled. Compared to the conventional lookup table approach, transient dynamics error can be improved significantly through using the model from this work.