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Analysis of the influence on fuel economy by transmission type and the estimation of fuel economy
Technical Paper
2000-05-0146
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English
Abstract
Recently, a requirement to fuel economy improvement is rising from the strong fear against the environment aggravation caused by CO2 that is discharged in the atmosphere. In such a situation, to pursue fuel economy, it pays attention to CVT and AMT as transmission form. However, the advantages and disadvantages about both of the transmission form weren't compared on the same condition in the past.
In this paper, the shift schedule, the drive power characteristic, the body variation and the engine variation are kept the same conditions to examine both type of transmission. And evidence the potential of fuel economy improvement of CVT and AMT.
In the case of CVT vehicles, increasing the ratio range was effective in increasing fuel economy when driving at relatively high speeds without much stopping and starting, while reducing friction was effective when driving at relatively low speeds with repeated stop and goes.
On the other hand, in the case of AMT vehicles, increasing the ratio range was effective in increasing fuel economy when driving at relatively high speeds without much stopping and starting. When driving at relatively low speeds with repeated stop and goes, we confirmed that achieving more efficient operation of the entire power plant is possible with a combination of increasing the ratio range, increasing the gears, and/or altering how ratios are assigned.
By this examination, we could understand the key to the method of fuel economy improvement by the transmission. And this could be made one index in future development of transmission.
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Citation
Yamamoto, T. and Aoki, K., "Analysis of the influence on fuel economy by transmission type and the estimation of fuel economy," SAE Technical Paper 2000-05-0146, 2000.Also In
References
- Yamamoto, et al. Development of Integrated Engine- CVT Control System HONDA R&D Technical Review 11 1 93 100 1999
- Sakaguchi, S., et al. Development of an Engine-CVT Integrated Control System SAE Paper 1999-01-0754 1999
- Sakaguchi, et al. Development of Engine-CVT Consolidated Control System Proc. Of JSAE, No. 74-98 13 16 1998