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Fast Transforms for Rapid Isolation of Misfiring Cylinders
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English
Abstract
This paper presents a method for the isolation of misfiring cylinders in an internal combustion engine.
The method is based on the measurement of the extrema of engine angular velocity. It has been shown that a number of indices can be derived from such a measurement, to provide an indication of engine performance degradation. In this study, an onboard microprocessor-based instrument samples the extrema of the engine velocity waveform in real time, generating an N or 2N vector representing each engine cycle, where N is the number of cylinders.
The data is processed by matrix transformations which are designed to isolate specific faults and their intensity. The transforms are constructed in such a way as to yield a nonzero output only when a certain fault is encountered.
The system is capable of detecting individual or multiple cylinder misfires, both complete and partial. Experimental verification has been carried out in a passenger vehicle.
Authors
Citation
Rizzoni, G., "Fast Transforms for Rapid Isolation of Misfiring Cylinders," SAE Technical Paper 871915, 1987, https://doi.org/10.4271/871915.Also In
SAE 1987 Transactions Alternative Engines and Engine Components and Systems
Number: V96-5; Published: 1988-09-01
Number: V96-5; Published: 1988-09-01
References
- Rizzoni G. “A Passenger Vehicle Onboard Computer System for IC Engine Fault Diagnosis, Performance Measurement and Control,” Proc. 37th IEEE Vehicular Technology Conference Tampa, FL June 1-3 1987 450 457
- Ribbens W. B. “A New Metric for Torque Nonuniformity,” SAE Intl. Congress & Exposition Cobo Hall, Detroit, Mich. Feb. 28 - Mar. 4, 1983 SAE 830425
- Henein N. “A Diagnostic Technique for the Identification of Misfiring Cylinders,” SAE Intl. Congress and Exposition Cobo Hall, Detroit, Mich. 1987 SAE 870546
- Rizzoni G. “A Dynamic Model for the Internal Combustion Engine,” Ph.D. Dissertation Department of Electrical Engineering and Computer Science The University of Michigan, Ann Arbor February 1986
- Ribbens W. B. Gross D. “Torque Nonuniformity Measurements in Gasoline Fueled Passenger Cars Equipped with automatic Transmission - Theory and Experimental Results,” SAE Intl. Congress and Exposition Cobo Hall, Detroit. Mich. Feb. 24-28. 1986 SAE 860414