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Analysis of the Influence of Crankshaft Vibration Upon the Instantaneous Flywheel Speed
Technical Paper
2000-05-0281
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English
Abstract
Momentary flywheel speed is the most convenient signal to detect cylinder-by-cylinder variations. Though some papers had indicated that torsional vibration of crankshaft should be considered at high-speed condition [1][2][3], it is still not very clear how to quantitatively analyze the influence of the vibration upon the flywheel speed. The goal of this paper is to reveal the influence and to find a way to compensate it. At first the transform functions of each cylinder torque to flywheel speed are analyzed. Then based on the transform functions, rigid crankshaft model and flexible crankshaft model are compared. The influence of the torsional vibration on the flywheel speed is investigated. Finally, a compensator of the influence is built. The compensator is verified by the simulation results. After compensation, the measured flywheel speed can be processed under the rigid crankshaft model.
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Citation
Jianqiu, L. and Minggao, Y., "Analysis of the Influence of Crankshaft Vibration Upon the Instantaneous Flywheel Speed," SAE Technical Paper 2000-05-0281, 2000.Also In
References
- Williams J. 1996 An overview of misfiring cylinder engine diagnostic techniques based on crankshaft angular velocity measurements SAE paper 960039
- Stephane Ginoux Jean-Claude Champoussin 1997 Engine Torque Determination by Crankangle Measuremets: States of Art, Future prospects SAE paper 970532
- Jurgen Forster Andrea L. Manfred M. et al. 1997 Advanced Engine Misfire Detection for SI-Engines SAE paper 970855
- Jenkins E.G. 1988 Validation of Power Fault Diagnostic Software by Digital Simulation 880690
- Citron S. O'Higgins J. Chen L.Y. 1989 Cylinder by cylinder engine pressure torque waveform determination utilizing crankshaft speed fluctuations SAE paper 890486