This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Gasoline Engine Knock Analysis using Cylinder Pressure Data
Annotation ability available
Sector:
Language:
English
Abstract
This paper addresses issues associated with the measurement and analysis of crank angle based cylinder pressure to obtain accurate knock data. Issues examined include knock model features, the effect of sample size, the impact of sampling frequency, optimum knock windowing and the influence of transducer in-cylinder location and mounting arrangement.
The study has demonstrated that a very large sample size is required to obtain good repeatability and at least 1000 engine cycles is recommended for knock intensity determination. A knock window of TDC to TDC+40 degrees has been shown to be appropriate whilst a 0.2 degree crank angle resolution is considered to be adequate for the knock algorithm employed. This work has also confirmed that transducers should have high natural frequency, be flush mounted to avoid cavity resonance and that knock signals can be significantly influenced by transducer location.
Recommended Content
Technical Paper | Phenomena that Determine Knock Onset in Spark-Ignition Engines |
Technical Paper | Computerized Knock Detection from Engine Pressure Records |
Technical Paper | Evaluation of Techniques for Absolute Cylinder Pressure Correction |
Authors
Topic
Citation
Brunt, M., Pond, C., and Biundo, J., "Gasoline Engine Knock Analysis using Cylinder Pressure Data," SAE Technical Paper 980896, 1998, https://doi.org/10.4271/980896.Also In
References
- Leppard, W.R. “Individual - Cylinder Knock Occurrences and Intensity in Multicylinder Engines” SAE paper 820074 1982
- Checkel, M.D. Dale, J.D. “Pressure Trace Knock Measurements in a Current S.I. Production Engine” SAE 890243 1989
- Checkel, M.D. Dale, J.D. “Testing a Third Derivative Knock Indicator on a Production Engine” SAE 861216 1986
- Schmillen, K.P. Rechs, M. “Different Methods of Knock Detection and Knock Control” SAE 910858 1991
- Cuttler, D.H. Girgis, N.S. “Photography of Combustion During Knocking Cycles in Disk and Compact Chambers” SAE 880195 1988
- Curry, S. “A Three Dimensional Study of Flame Propagation- in a Spark Ignition Engine” SAE Transactions 71 1963
- Golombok, M et al “Heat Release and Knock in Paraffinic and Aromatic Fuels and the Effect of an Ashless Anti-Knock Additive” SAE 952405 1995
- Chomiak, J. Skold, J. “Fuel Effects on Energy Release and Knock Parameters in a SI Engine” SAE 952404
- Konig, G. Sheppard, C,G.W. “End Gas Autoignition and Knock in a Spark Ignition Engine” SAE 902135 1990
- Blunsden, C. A. Dent, J.C. “The Simulation of Autoignition and Knock in a Spark Ignition Engine with Disk Geometry” SAE 940524 1994
- Pan, J. Sheppard, C.G.W. “A theoretical and Experimental Study of the Modes of End Gas Autoignition Leading to Knock in S.I. Engines” SAE 942060 1994
- Draper, C.S. “Pressure Waves Accompanying Detonation in the Internal Combustion Engine” J. Aeronautical Sciences 5 6 1938
- Hickling, R. et al “Pressure Pulsations in Engine Cylinders Engine Noise - Excitation, Vibration and Radiation” Hickling R Kamal M.M. Plenum Press London 1982
- Kistler Instruments Pressure Transducer Data sheets
- Betz, G. Zellbeck, H. “MAHLE's KI Meter for the Determination of Knock Intensity” Product Literature
- Lancaster, D.R. Krieger, R.B. Lienesch, J.H “Measurement and Analysis of Engine Pressure Data” SAE paper 750026 1975