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An Ionization Current based Cylinder Gas Pressure Estimation for Knock Detection and Control in a Single Cylinder SI Engine
Technical Paper
2009-32-0118
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English
Abstract
The ionization current across the spark plug gap is obtained by applying a constant voltage using DC power source across the spark gap after the high-voltage discharge. The methodology involves study and comparison of different knock detection methods (cylinder gas pressure, accelerometer and ion current) through literature survey, development of analytical models (ionization current, chemical equilibrium, kinetic Nitric Oxides) to estimate crank angle resolved cylinder gas pressure from the measured values of ionization current. Model refinements and validations, development of Ignition Coil integrated DC power source and ion current measurement circuit, Transistorized Coil Ignition and microcontroller based knock controller have been carried out. Experiments have been conducted to validate the model with the reference method (cylinder gas pressure). The ion current and cylinder gas pressure signals are measured during knocking conditions and it is shown that ion current signals can be used to detect knock.
A circuit to detect ion current by using single spark plug has been developed and applied successfully. The nature of ion currents has been studied and a model has been developed to estimate cylinder gas pressure from this signal. This has been validated and applied to detect presence of knock. A microcontroller-based system with software has been developed to control the spark timing based on knock intensity. The purpose of this work is to implement it in a two wheeler small engine with a long term goal to increase compression ratio in lean burn engines with high likelihood of knock.
Authors
Citation
Kumar, D., Ramesh, A., Babu, M., and Manivannan, P., "An Ionization Current based Cylinder Gas Pressure Estimation for Knock Detection and Control in a Single Cylinder SI Engine," SAE Technical Paper 2009-32-0118, 2009.Also In
References
- kiencke Uwe Nielsen Lars Automotive Control Systems Springer 2004
- Lundin Andreas Vressner Andreas “Pressure Oscillations during Rapid HCCI Combustion” SAE
- Daniels Chao F. Zhu Guoming G. Winkelman James “Inaudible Knock and Partial-Burn Detection Using In-Cylinder Ionization Signal” SAE 2003-01-3149 2003
- Checkel M.D. Dale J.D. “Computerized Knock Detection from Engine Pressure Records” SAE 860028 1986
- Burgdorf Klaas Denbratt Ingemar “Comparison of Cylinder Pressure Based Knock Detection Methods” SAE 972932 1997
- Heywood, J.B Internal Combustion Engine Fundamentals McGrawHill 1988
- Saitzkoff, A. Reinmann R. Berglind T. Glavmo M. “An Ionization Equilibrium Analysis of Spark Plug as an Ionization Sensor” SAE 960337 1996
- Ferguson C.R. Kirkpatrick A.T. Internal Combustion Engines John Wiley & Sons Inc. 2001