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Engine Diagnostics by Dynamic Shaft Measurement: A Progress Report
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English
Abstract
The feasibility of relating crankshaft free end torsional signals to the misfiring of an individual cylinder has been established in earlier torsional simulation work [1]. This paper advances two diagnostic methods for detection of the IMEP level of individual cylinders.
The first method is an enhanced pattern recognition method using both the flywheel torque fluctuation as the primary signal; and the model based reciprocating inertia knowledge for gas pressure torque harmonics determination. The enhanced pattern recognition method ensures IMEP level detection for each individual cylinder.
The second method i s based on a reverse simulation algorithm. The dynamic flywheel speed fluctuation is used as the input signal to reconstruct cylinder pressure diagrams for each cylinder.
In both methods, a rigorous, multi-mass, lumped mass, elastic crankshaft model is used to depict the mass-elasticity damping system.
In the torsional vibration simulation mode, individual cylinder gas pressure and engine RPM are the two operating inputs. Flywheel torque fluctuation and flywheel speed fluctuation are the outputs.
In the reverse simulation mode, the flywheel speed fluctuation is the input for reconstruction of the individual cylinder pressure. A normalized heat release rate map is used to bridge the gas pressure torque harmonics and the individual cylinder pressure harmonics.
This paper reports the progress made on the analysis of the enhanced pattern recognition method and on the reverse simulation algorithm using a rigorous multi mass, multi cylinder engine model. Analysis shows that the reverse simulation algorithm is most promising for on-board firing diagnostics and cylinder pressure reconstruction.
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Authors
Citation
Chen, S. and Chen, S., "Engine Diagnostics by Dynamic Shaft Measurement: A Progress Report," SAE Technical Paper 932412, 1993, https://doi.org/10.4271/932412.Also In
References
- “Crankshaft Torsional Simulation - An Update and Correlation with Test Results” SAE 861226
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- “Determination of Engine Cylinder Pressures from Crankshaft Speed Fluctuation” Brown Terrence S. Neill W. Stuart International Congress & Exposition Detroit, MI February 1992
- “A Diagnostic Technique for the Identification of Misfiring Cylinder(s)” Rezeka Sohair F. Nenein Naeim A. SAE 870546
- “Onboard Diagnosis of Engine Misfire” Ribbens William B. Rizzoni Giorgio SAE 901768
- “Methods of On-Board Misfire Detection” Plapp Gunther Klenk Martin Moser Winfried SAE 900232
- “Misfire Detection by Evaluating Crankshaft Speed - A Means to Comply with OBDII.” Klenk Martin Moser Winfried Mueller Werner Wimmer Wolfgang SAE 930399
- “Cylinder by Cylinder Engine Pressure and Pressure Torque Waveform Determination Utilizing Speed Fluctuations” Citron Stephen J. O'Higgins JOhn E. Chen Lillian Y. SAE 890486
- “Possibilities to Reconstruct Indicator Diagrams by Analysis of the Angular Motion of the Crankshaft” Taraza Dinu Professor Polytechnic Institute of Bucharest, Department of Mechanical Engineering
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