This content is not included in your SAE MOBILUS subscription, or you are not logged in.
High-Level Modeling of an RF Pulsed Quarter Wave Coaxial Resonator with Potential use as an SI Engine Ignition Source
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2008 by SAE International in United States
Annotation ability available
Significant environmental and economic benefit could be obtained if spark ignited (SI) engines could be made more efficient. Engine operation using leaner fuel air mixtures at higher power densities and pressures promise higher thermal efficiencies. Mixtures required for such operation are often difficult to ignite with traditional spark plugs. In pursuit of better ignition sources, this paper presents a high-level model of an alternative microwave plasma ignition source under development. In this publication, atmospheric measurements of a pulsed microwave ignitor are used to derive an empirical model that will allow for control and increased energy delivery to the device. The model accounts for a simplistic plasma formation delay, a drop in resonance frequency as a result of plasma formation, and a subsequent change in associated microwave reflection coefficient. Using this model, it is then possible to suggest a control strategy for the device where input variables such as the excitation frequency can be adjusted. Such adjustment should result in improved energy coupling to the device.
CitationPertl, F. and Smith, J., "High-Level Modeling of an RF Pulsed Quarter Wave Coaxial Resonator with Potential use as an SI Engine Ignition Source," SAE Technical Paper 2008-01-0089, 2008, https://doi.org/10.4271/2008-01-0089.
- Ariyur, K., Krstic, M., Real-Time Optimization by Extremum-Seeking Control, Hoboken, 2003.
- Bonazza, T.J., Van Voorhies, K.L., Smith, J.E., “RF Plasma Ignition System Concept for Lean Burn International Combustion Engines,” SAE Paper 929416, 1992.
- Dale, J.D., Checkel, M.D., Smy, P.R., “Application of High Energy Ignition Systems to Engines,” Progress in Energy and Combustion Science, Vol. 23, pp 379-398, 1997.
- Krstic, M., Wang, H.H., “Stability of extremum seeking feedback for general nonlinear dynamic systems,” Automatica, Vol. 36, pp. 595-601, 2000.
- Maly, R., Saggau, B., Wagner, E., and Zigler, G., “Prospects of Ignition Enhancement,” SAE Paper 830478, SAE Transactions, Vol. 92, 1983.
- McCoole, M.E., Tozzi, L., Tribble, D.L., “Solutions for improving spark plug life in high efficiency, high power density, natural gas engines,” ICES2006-1417, Proceedings of the Spring Technical Conference of the ASME Internal Combustion Engine Division, Achen, Germany, pp 163-170, May 2006.
- McIntyre, Dustin L., “The Coaxial Cavity Resonator as a Prototype RF IC Engine Ignition Source,” Master Thesis, West Virginia University, Morgantown, WV, 2000.
- Morosanov, I.S., “Method of extremum control,” Automation Remote Control, Vol. 18, pp.1077-1092, 1957.
- Nash, M.A., “The Coaxial Cavity Resonator and R.F. Power Processing,” Master Thesis, West Virginia University, Morgantown, WV, 1988.
- Pertl, F.A., Smith, J.E., “Feasibility of Pulsed Microwave Plasma Ignition for use in SI-Engines”, ICEF2007-1776, Proceedings of the ASME International Combustion Engine Division 2007 Fall Technical Conference, Charleston, South Carolina, USA, Oct.14-17,2007.
- Ramo, S., Whinnery, J.R., Van Duzer, T., Fields and Waves in Communication Electronics, 3rd ed. John Wiley and Sons, ISBN 0-471-58551-3, 1993
- Starikovskaia, S.M., “Topical Review: Plasma assisted Ignition and Combustion,” Journal of Physics D: Applied Physics, Vol. 39, pp R265-29, Aug 2006.
- Stiles, R.D., Thompson, G..S., Smith, J.E., “Investigation of a Radio Frequency Plasma Ignitor for Possible Internal Combustion Engine Use,” SAE Paper 970071, 1997.