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The Evaluation Method of Surge on Motorcycles
Technical Paper
978508
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Language:
English
Abstract
We studied the mechanism of occurrence and evaluation of the surge that is produced in motorcycles equipped with 2-stroke cycle engines by simultaneously measuring chassis behavior and combustion. When modal analysis was performed by measuring the acceleration of each chassis component while placing the test vehicle on a chassis dynamo, it was found that pitching, in which the tires serve as springs, and resonance, generated from the rear suspension spring, occurred simultaneously during surge generation. The major component that is felt physically is pitching. Although a certain degree of correlation was observed between fluctuations in combustion and occurrence of pitching, since the drive line contains a large amount of back lash, the system has a high degree of non-linearity, thus making it difficult to obtain a well-defined correlation. In addition, when comparisons were made using three vehicles having different irregular combustion patterns, the overall dB value of the pitching rate used as the evaluation parameter was found to coincide with physical sensation.
Citation
Motoyama, Y. and Katoh, R., "The Evaluation Method of Surge on Motorcycles," SAE Technical Paper 978508, 1997.Also In
References
- Tsuchiya K. , Nagai Y. , Gotoh T. A Study of Irregular Combustion in 2-Stroke Cycle Gasoline Engine SAE Paper 830091
- Tsuchiya K. , Hirano S. , Okamura M. , Gotoh T. Emission Control of Two-Stroke Motorcycle Engines by the Butterfly Exhaust Valve SAE Paper 800973
- Sekine M. , Ishikawa T. The Method for Evaluation of Irregular Combustion in a 2-Stroke Cycle Gasoline Engine SAE Paper 912617