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Development of New CVT for Global Compact Car

Article of Honda R&D Technical Review Vol.26 No.1

Summary

A new CVT that is lighter in weight and more highly efficient than the previous CVT for use in compact vehicles has been developed and used in the 2014 model year FIT. The allowable torque capacity was expanded to that of the 1.8-L engine class, making this CVT usable in a greater number of vehicle models. The ratio coverage was also expanded and the transfer efficiency was increased to enhance fuel economy and drivability.
Integration of hydraulic control system functional parts and reduction in the number of case component parts were carried out as structural modifications. Pulley side pressures were also reduced by the use of new CVT fluid so that the pulley could be made more compact and lighter in weight. These measures achieved a weight reduction of approximately 10%.
Enhancements were made in cooperative control of the power train and in CVT shift control, providing a more linear acceleration feeling than in previous models.

Reference

(1) Ohsono, K., Aoki, T.: Development of Full-electronic Control Metal Belt CVT, HONDA R&D Technical Review, Vol. 8, p. 21-33 (in Japanese)
(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, Y.: 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
(5) Kanokogi, K., Konishi, K.: Development of New CVT for K-car and Control System, JSAE Annual Congress Proceedings, No. 146-12, p. 1-4 (2012) (in Japanese)
(6) Inukai, K., Shibahara, A., Murakami, Y., Uchino, T., Kojima, M., Nishiyama, K.: Development of New CVT for Midsize Vehicle, Honda R&D Technical Review, Vol. 24, No. 2, p. 47-53

Author (organization or company)

Tomoyuki KANDA(Automobile R&D Center)、Hirohiko TOTSUKA(Automobile R&D Center)、Masashi OONUMA(Automobile R&D Center)、Norimasa SHUDO(Automobile R&D Center)、Tomohiro HIRATA(Automobile R&D Center)、Ukyo OGATA(Automobile R&D Center)

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