Faculty of Mechanical Engineering, K. N. Toosi University of Technology, P.O.Box 16765-3381, Tehran, I. R. IRAN
The application of ion current signals is one of the most recent approaches in engine management systems. By applying a small constant DC voltage across the electrodes of the spark plug and measuring the current through the electrode gap, the state of gas may be measured and investigated. In this paper a computer code is developed in order to analyze the state of gas during the combustion period. It is shown that there is a strong correlation between the peak pressure and the maximum current position. It is also shown that among all combustion products, the NO has the most contribution in generating electrical current. The two zones model is used for calculating the cylinder pressure and temperature.
 Calcote, H.F., Mechanism for the Formation of Ions in Flames, Combustion and Flame, 1, 385 (1957).
 Calcote, H. F., Ion Production and Recombination in Flames, Eight symposium (International) on Combustion (1960).
 Anderson, R. L., In-Cylinder Measurement of Combustion Characteristics Using Ionization Sensors, SAE 860485 (1985).
 Shimasaki, Y., Kanehito, M., Baba S., Muaruyama, S., Hisaki, T. and Miyatu, S., Spark Plug Voltage Analysis for Monitoring Combustion in an Internal Combustion Engine, SAE 930461 (1993).
 Auzins, J., Johansson, H. and Nytomt, J., Ion-Gap Sense in Misfire Detection, Knock and Engine Control, SAE 950004 (1995).
 Lee, A. and Pyko, J.S, Engine Misfire Detection by Ionization Current Monitoring, SAE 950003 (1995).
 Collings, N., Dinsdle, S. and Eade, D., Knock Detection by Means of the Spark Plug, SAE 860635 (1986).
 Brehob, D.D, An Exhaust Ionization Sensor for Detection of Late Combustion with EGR, SAE 898084 (1989).
 Bray. N. C. And Callings, N., Ionization Sensors for Internal Combustion Engine Diagnostics, Endeavor, New Series., 15 (1) (1991).
 Reinmann, R., Saitzkoff, A. and Mauss, F., Local Air-Fuel Ratio Measurements Using the Spark Plug as an Ionization Sensor, SAE paper No. 970856, (SAE SP-1263): 175-185 (1997).
 Shamekhi, A. H. and Ghaffari, A., Peak Pressure Position Estimation by Ion Current Sensing, 10th Int. Conf. of Mech. Eng., p. 608 (2002).
 Shamekhi, A. H. and Ghaffari, A., Spark Advance Control by Ion Current Sensing in SI Engines, 11th Int. Conf. of Mech. Eng. , p. 1908 (2003).
 Malaczynski, G.W. and Baker, M.E., Real Time Digital Signal Processing of Ionization Current for Engine Control Diagnostic and Control, SAE Technical Paper Series 2003-01-1119 (2003).
 Collings, N., Dinsdale, S. and Hands, T., Plug Fouling Investigations on a Running Engine-an Application of a Novel Multi-Purpose Diagnostic System based on the Spark Plug, SAE paper No. 91318 (1991).
 Wang, Y. and Zhou, L., Investigation of the Detection of Knock and Misfire of the Spark Ignition Engine With the Ionic Current Method, Proc, Instn Mech. Engrs., 217, Part D: J. Automobile Engineering, (2003).
 Strandh, P., Christensen, M. and Johansson, B., Ion Current for HCCI combustion Feedback, SAE 2003-01-3216 (2003).
 Shamekhi, A. H. and Ghaffari, A., A New Method for Peak Pressure Position Estimation by Ion Current Sensing, 12th Int., Conf. of Mech. Eng., p. 130012 (2004).
 Amann, C. A., Cylinder -Pressure Measurement and Its Use in Engine Research, SAE Technical Paper 852067 (1985).
 Kramer, M. and K. Wolf, K., Approaches to Gasoline Engine Control Involving the Use of Ion Current Sensory Analysis, SAE, p. No. 905007 (1990).
 Martinsson, L., “Studies of Spark Plasmas” LRAP- 66, Lund, Sweden (1986).
 Smirnov, B.M., “Physics of Ionized Gases”, John Wiley (2001).
 Shamekhi, A. H. and Ghaffari, A., An Improved Model for SI Engines, ASME, ICEF2004-818 (2004).
 Baruah, P. C., The Thermodynamics and Gas Dynamics of Internal-Combustion Engines, Vol. II CLARENDON PRESS, OXFORD (1986).
 Heywood, J. B., “Internal Combustion Engine Fundamentals”, McGraw-Hill, (1988).