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Spark Ignition Engine Knock Detection Using In-Cylinder Optical Probes
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Abstract
Two types of in-cylinder optical probes were applied to a single cylinder CFR engine to detect knocking combustion. The first probe was integrated directly into the engine spark plug to monitor the radiation from burned gas in the combustion process. The second was built into a steel body and installed near the end gas region of the combustion chamber. It measured the radiant emission from the end gas in which knock originates. The measurements were centered in the near infrared region because thermal radiation from the combustion products was believed to be the main source of radiation from a spark ignition engine. As a result, ordinary photo detectors can be applied to the system to reduce its cost and complexity.
It was found that the measured luminous intensity was strongly dependent upon the location of the optical sensor. However, good correlations existed between the luminosities measured from two probes and cylinder pressure quantities in terms of crankangle and magnitude of peak pressure of normal combustion cycles. Knock can be detected by the spark plug optical probe as a high frequency ripple similar to that observed on the pressure waveform. The knock intensity was quantified by the peak-to-peak band-pass filtered luminosity with the center frequency set at the resonant frequency of the combustion chamber. This luminous knock intensity was found to correlate well with the integral of the root-mean-square (rms) of the band-passed cylinder pressure signal.
Filtered peak-to-peak oscillations in luminosity measured by an inexpensive infrared detector sighting across the combustion chamber offer an alternative to pressure or acceleration measurements in the sensing and control of engine knock.
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Sun, Z., Blackshear, P., and Kittelson, D., "Spark Ignition Engine Knock Detection Using In-Cylinder Optical Probes," SAE Technical Paper 962103, 1996, https://doi.org/10.4271/962103.Also In
References
- Konig, G. Sheppard, C. G.W. “End Gas Autoignition and Knock in a Spark Ignition Engine” SAE Paper 902135 1990
- Blunsdon, C. A. Dent J. C. “The Simulation of Autoignition and Knock in a Spark Ignition Engine with Disk Geometry” SAE Paper 940524 1994
- Dues, S. M. Adams, J. M. Shinkle, G. A. “Combustion Knock Sensing: Sensor Selection and Application Issues” SAE Paper 900488 1990
- Ohyama, Y. Ohsuga, M. Kuroiwa, H. “Study on Mixture Formation and Ignition Process in Spark Ignition Engine Using Optical Combustion Sensor” SAE paper 901712 1990
- Spicher, U. Spiegel, L. Reggelin, B. Heuser, G. “Investigation into the Applicability of an Optical Fiber Sensor for Knock Detection and Knock Control System” SAE Paper 922370 1992
- Nutton, D. Pinnock, R. A. “Closed Loop Ignition and Fueling Control Using Optical Combustion Sensors” SAE Paper 900486 1990
- Gaydon, A.G. The Spectroscopy of Flames 2nd Champman and Hall Ltd. London 1974
- Lavoie, G. A. Heywood, J. B. Keck, J. C. “Experimental and Theoretical Study of Nitric Oxide Formation in Internal Combustion Engines” Combustion Science and Technology 1 1970
- Remboski, D. J. Plee, S. L. Martin, J. K. “An Optical Sensor for Spark-Ignition Engine Combustion Analysis and Control” SAE Paper 890159 1989
- Yang, J. Plee, S. L. Remboski, D. J., Jr. Martin, J. K. “Comparison Between Measured Radiance and a Radiation Model in a Spark-Ignition Engine” Transaction of the ASME, Journal of Engineering for Gas Turbines and Power 112 July 1990
- Yang, J. Plee, S. L. Remboski, D. J., Jr. “Relationship Between Monochromatic Gas Radiation Characteristics and SI Engine Combustion Parameters” SAE Paper 930216 1993
- Affleck, W. S. Fish, A. “Knock: Flame Acceleration or Spontaneous Ignition” Combustion and Flame 12 1968
- Leppard, W. R. “Individual Cylinder Knock Occurrence and Intensity in Multicylinder Engines” SAE Paper 820074 1982
- Liiva, P. M. Cobb, J. M. Acker, W. P. “Swirl, Fuel Composition, Localized Hating, and Deposit Effects on Engine Knock Location” SAE Paper 932814 1993
- Checkel, M. D. Dale, J. D. “Computerized Knock Detection from Engine Pressure Records” SAE Paper 860028 1986