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Analysis of CVT and Automated MT Influence on Fuel Economy, and the Estimating Improvements in Fuel Economy

Article of Honda R&D Technical Review Vol.12 No.1

Summary

The effects on mode fuel economy by different types of transmissions, CVT and Automated Manual Transmission, were investigated using the same vehicle and engine specifications while varying transmission ratio range, friction, and similar. The results are as follows: In the case of the CVT, it was confirmed that a wider transmission ratio range is effective when driving at relatively high speeds with fewer stop-and-go situations, and friction reduction is effective when driving at relatively low speeds with frequent stop-and-go situations. On the other hand, in the case of Automated Manual Transmission, it was confirmed that a wider transmission ratio range is effective when driving at relatively high speeds with fewer stop-and-go situations, which is the same as the CVT, while a combination of a wider transmission ratio range, an increase in shift steps, and an appropriate distribution of transmission ratios is necessary when driving at relatively low speeds with frequent stop-and-to situations in order to achieve high efficiency power plant operation.

Reference

(1) Yamamoto, K., et al.: Development of Integrated Engine-CVT Control System, HONDA R&D Technical Review, Vol.11, No1, p.93-100(1999) (Written in Japanese)
(2) Sakaguchi, S., et al.: Development of an Engine-CVT Integrated Control System, SAE Paper 1999-01-0754, (1999)
(3) Sakaguchi, S., et al.: Development of Engine-CVT Consolidated Control System, Proc. of JSAE No.74-98, p.13-16(1998) (Written in Japanese)

Author (organization or company)

Kazuhisa YAMAMOTO(Tochigi R&D Center)、Takashi AOKI(Tochigi R&D Center)

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