This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An Exhaust Ionization Sensor for Detection of Late Combustion with EGR
Annotation ability available
Sector:
Language:
English
Abstract
In many operating regimes, exhaust gas recirculation (EGR) while maintaining MBT spark timing improves cycle efficiency in SI engines. As the level of exhaust dilution is increased, the flame speed is reduced and the combustion rate is impaired. This leads to a drop in fuel economy as EGR rates are increased beyond the optimal level. To take advantage of the efficiency benefit of EGR without incurring the penalties of late combustion, a sensor which detects late combustion is tested. The signal from an ionization sensor placed near the exhaust port has been found to correlate to combustion which continues late into the expansion stroke. It may be possible to use the output from the ion sensor to maintain the EGR at the the optimum for fuel economy.
Recommended Content
Authors
Citation
Brehob, D., "An Exhaust Ionization Sensor for Detection of Late Combustion with EGR," SAE Technical Paper 892084, 1989, https://doi.org/10.4271/892084.Also In
References
- Kuroda, H. Nakajima, Y. Sugihara, K. Takagi, Y. Muranka, S. “The Fast Burn with Heavy EGR, New Approach for Low NO x and Improved Fuel Economy,” SAE Paper 780006 1078
- Watanabe, E. Fukutani, I. “Knock Reduction of Spark-Ignition Engines by EGR,” SAE Paper 860034 1986
- Heywood, J.B. Watts, P.A. “Parametric Studies of Fuel Consumption and NO Emissions of Dilute Spark-Ignition Engine Operation Using a Cycle Simulation,” paper C98/79, in Proceedings of Conference on Fuel Economy and Emissions of Lean Burn Engines Institution of Mechanical Engineers London 1979
- Calcote, H.F. “Ion and Electron Profiles in Flames,” Ninth Symposium (International) on Combustion 622 37 1963
- Clements, R.M. Smy, P.R. “The Variation of Ionization with Air/Fuel Ratio for a Spark-Ignition Engine,” Journal of Applied Physics 47 2 505 09 1976
- Arrigoni, V. Calvi, F. Cornetti, G.M. Pozzi, U. “Turbulent Flame Structure as Determined by Pressure Development and Ionization Intensity,” SAE Paper 730088 1973
- Rado, W.G. Johnson, W.J. “Significance of Burn Types, as Measured by Using the Spark Plugs as Ionization Probes, with Respect to the Hydrocarbon Emission Levels in S.I. Engines,” SAE Paper 750354 1975
- Williams, D. “Exhaust Gas Ionization Sensors for Spark Ignition Engine Control and Monitoring,” Ph.D. thesis University of Nottingham 1985
- Collings, N. Doyle, F.J., III Hayhurst, A.N. Kittelson, D.B. Williams, D. “Charged Species in the Exhaust of a Spark Ignition Engine as Studied With Langmuir Probes and a Mass Spectrometer,” Combustion Science and Technology 62 31 59 1988
- Collings, N. Wiliey, J. “Cyclically Resolved HC Emissions from a Spark Ignition Engine,” SAE Paper 871691 1987