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Development of New CVT for Midsize Vehicle

Article of Honda R&D Technical Review Vol.24 No.2

Summary

A CVT for midsize vehicles was developed that simultaneously achieves high levels of fuel efficiency performance and driving enjoyment, reliability and marketability enabling deployment to global markets, and support for high-power direct injection engines. This was done by modifying the CVT for 2.4 L-class vehicles sold in Japan, expanding the ratio range, using CVTF with a high friction coefficient that simultaneously realizes both high efficiency and a high transmission capacity, and adopting protective control such as constant control of the clutch pressure. This enabled achievement of an overall length of 386.5 mm, total weight of 96.1 kg, and maximum transmission torque of 270 Nm, and also enhanced fuel efficiency by approximately 10% (CAFE Comb.) compared to the 2008 model year Accord 5AT and approximately 5% (JC08) compared to the 2010 model year STEP WGN CVT. Thus, CVT performance was obtained that can simultaneously realize high levels of both fuel efficiency and driving enjoyment. This CVT is applied from the 2012 model year STEP WGN and the 2013 model year Accord.

Reference

(1) Ohsono, K., Aoki, T.: Development of Full-electronic Control Metal Belt CVT, HONDA R&D Technical Review, Vol. 8, p. 21-33
(2) Ohta, S., Kunii, H., Sumi, M., Fujimoto, S., Yamaguchi, T.: Development of a Compact CVT for a Hybrid Car - Insight, HONDA R&D Technical Review, Vol. 12, No. 2, p. 61-70
(3) Sumi, M., Kunii, H., Fujimoto, S., Ichijo, S., Hasegawa, T., Fukushima, M.: The Development of a New Compact CVT for the Fit, Honda R&D Technical Review, Vol. 14, No. 1, p. 67-76
(4) Sato, Y., Urano, J., Ohashi, A., Sakuma, S., Yamaguchi, M.: Development of CVT for 2004 Model Odyssey, Honda R&D Technical Review, Vol. 16, No. 2, p. 87-94

Author (organization or company)

Koichiro INUKAI(Automobile R&D Center)、Akihiro SHIBAHARA(Automobile R&D Center)、Yasunori MURAKAMI(Automobile R&D Center)、Takeshi UCHINO (Automobile R&D Center)、Michio KOJIMA(Automobile R&D Center)、Keiichi NISHIYAMA(Automobile R&D Center)

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