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Development on Internal EGR Feedback Control Based on Ion Current
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
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The history of the study to apply the ion current to gasoline engine control is so long, and many papers on modeling and application have been published so far. Especially, the study on modeling has been advanced, and it has become possible to estimate the ion current. And in the area of application, many papers have proposed the detection method of engine knock, pre-ignition, combustion stability and so on. However, there few results the proposed methods were put to the production engine.
This paper proposes the internal exhaust gas recirculation (EGR) control system based on ion current which enables to set the limit value of internal EGR rate, so as to extract the best fuel efficiency of engine itself. This system has the following features which can contribute to putting to commercial use.
- 1To detect the engine stability accurately, the original parameter considering the following two items was developed:
- iIn case of applying the gap of ignition plug as Ion probe, the detection accuracy of early combustion phase is higher than the one of later phase.
- iiThe gasoline engine has the characteristic which alternates stable and unstable combustion, when the fluctuation of indicated mean effective pressure (IMEP) becomes larger.
- 2To control the EGR rate to limit value quickly by using the above combustion fluctuation parameter, the robust regulator not including integral function was applied. And also, the gain of regulator was designed based on control theory.
CitationKusuhara, T., Shinkai, T., Yoshida, K., Langley, D. et al., "Development on Internal EGR Feedback Control Based on Ion Current," SAE Technical Paper 2017-01-0793, 2017, https://doi.org/10.4271/2017-01-0793.
- Naoumov, V., Demin, A., Andersson, I., and Sokolov, A., "Modeling of Combustion and Non-Equilibrium Ionization in Spark Ignition Engines," SAE Technical Paper 2002-01-0009, 2002, doi:10.4271/2002-01-0009.
- Naoumov, V., Demin, A., and Sokolov, A., "Numerical Study and Analysis of Pollutant Production and Emission Control Using Ion Current Prediction in the SI Engine," SAE Technical Paper 2003-01-0724, 2003, doi:10.4271/2003-01-0724. ,
- Byttner, S., Rögnvaldsson, T., and Wickström, N., "Estimation of Combustion Variability Using In-cylinder Ionization Measurements," SAE Technical Paper 2001-01-3485, 2001, doi:10.4271/2001-01-3485..
- Byttner, S. and Holmberg, U., "CLOSED-LOOP CONTROL OF EGR USING ION CURRENTS", 27th IASTED International Conference, 2008
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- Adachi, S., "System Identification for Control by MATLAB", Tokyo Electric University, 1996