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The Potential of Using the Ion-Current Signal for Optimizing Engine Stability - Comparisons of Lean and EGR (Stoichiometric) Operation
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 03, 2003 by SAE International in United States
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Ion current measurements can give information useful for controlling the combustion stability in a multi-cylinder engine. Operation near the dilution limit (air or EGR) can be achieved and it can be optimized individually for the cylinders, resulting in a system with better engine stability for highly diluted mixtures. This method will also compensate for engine wear, e.g. changes in volumetric efficiency and fuel injector characteristics. Especially in a port injected engine, changes in fuel injector characteristics can lead to increased emissions and deteriorated engine performance when operating with a closed-loop lambda control system. One problem using the ion-current signal to control engine stability near the lean limit is the weak signal resulting in low signal to noise ratio. Measurements presented in this paper were made on a turbocharged 9.6 liter six cylinder natural gas engine with port injection. Each cylinder was individually controlled by a cylinder control module (CCM). A high turbulence combustion chamber was used to be able to operate with highly diluted mixtures. Comparisons between lean and EGR (stoichiometric) operation were made to investigate the potential of using the ion-current signal to control engine stability (cylinder to cylinder and cycle to cycle variations). A much stronger ion-current signal was found with EGR compared to lean operation, for the same load and comparable emissions.
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CitationEinewall, P., Tunestål, P., and Johansson, B., "The Potential of Using the Ion-Current Signal for Optimizing Engine Stability - Comparisons of Lean and EGR (Stoichiometric) Operation," SAE Technical Paper 2003-01-0717, 2003, https://doi.org/10.4271/2003-01-0717.
- Einewall P. and Johansson B.: “Cylinder to Cylinder and Cycle to Cycle Variations in a Six Cylinder Lean Burn Natural Gas Engine”, SAE Spring Fuels and Lubricants Meeting, 2000.
- Puzinauskas P.V., Willson B. D., Evans K. H.: “Optimization of Natural Gas Combustion in Spark-Ignited Engines Through Manipulation of Intake-Flow Configuration”, SAE paper 2000-01-1948
- Johansson B.: “On Cycle to Cycle Variations in Spark Ignition Engines”, Doctoral Thesis, Lund Institute of Technology, 1995.
- Saitzkoff A., Reinmann R., Berglind T., Glavmo M.: “An ionization equilibrium analysis of the spark plug as an ionization sensor”, SAE paper 960337 (1996).
- Yoshiyama S., Tomita E., Hamamoto Y.: “Fundamental Study on Combustion Diagnostics Using a Spark Plug as Ion Probe”, SAE paper 2000-01-2828.
- Heywood J. B.: “Internal Combustion Engine Fundamentals” ISBN 0-07 100499-8.
- Erlandsson O.: “Development of an Engine System Simulation Software Package - ESIM” ISRN LUTMDN/TMVK - 7043 Lund Institute of Technology report, 2000.
- Reinmann R., Saitzkoff A., Mauss F.: “Local Air-Fuel Ratio Measurements Using the Spark Plug as an Ionizatin Sensor”, SAE paper 970856 (1997).
- Hellring M., Munther T., Rognvaldsson T., Wickstrom N., Carlsson C., Larsson M., Nytomt J.: “Robust AFR Estimation Using the Ion Current and Neural Networks”, SAE paper 1999-01-1161.
- Saitzkoff A., Reinmann R., Mauss F.: “In-Cylinder Pressure Measurements Using the Spark Plug as an Ionization Sensor”, SAE paper 970857 (1997).
- Ohashi Y., Fukui W., Tanabe F., Ueda A.: “The Application of Ionic Current Detection System for the Combustion Limit Control”, SAE paper 980171 (1998).
- Andersson I.: “Cylinder Pressure and Ionization Current Modeling for Spark Ignited Engines”, Licentiate Thesis 2002
- Johansson B.: “Correlation Between Velocity Parameters Measured With Cycle-Resolved 2-D LDV and Early Combustion in a Spark Ignition Engine”, ISRN LUTMDN/TMVK - 7012
- Onishi S:, Jo S. Hong, Shoda K., Jo P Do, Kato S.: “Active Thermo-Atmosphere Combustion (ATAC) - A New Combustion Process for Internal Combustion Engines”, SAE790501