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Cornering Lights of 2020 CRF1100L Africa Twin Adventure Sports Using Additional Light Source

Article of Honda R&D Technical Review Vol.32 No.2

Summary

After the revision of United Nations regulations in 2013, cornering lights are permitted for motorcycles. A number of cases of cornering light applications to motorcycles are seen up until now. We have developed the cornering lights for comfortable touring, especially suitable for riding suburban roads mainly at moderate speeds, and applied to the CRF1100L Africa Twin Adventure Sports. Using the said motorcycle, we conducted studies on the three key factors in the designing of cornering lights; the setting the operating range according to the bank angle, the setting the light distribution with an additional light source, and the control of visual distraction. The operating of cornering lights is determined from the frequency of bank angles measured from actual night riding. The distribution of light from the additional light source is determined so as to illuminate the cornering direction at the same intensity as the dipped beam. Regarding the visual distraction, the cornering lights are designed so as to increase intensity gradually after turning it on until reaching 100%. A hysteresis is also set in the switching to help prevent flickering. With these measures taken, the cornering lights suitable for touring have been realized.

Reference

(1) Ishiguro, K., Yamada, Y.: Development of Control Strategy for World-first Intelligent AFS, Denso Technical Review, Vol. 9, No. 2, p. 137-141, (2004) (in Japanese)
(2) http://www.unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/2013/r053r3e.pdf
(3) http://www.unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/2013/R113r3am1e.pdf
(4) Morita, K., Okada, N., Okamura, H., Suzuki, S.: Development of 2020 CRF1100L Africa Twin, Honda R&D Technical Review, Vol. 32, No. 2, p. 17-26
(5) https://www.honda.co.jp/environment/face/case40/episode/episode01.html, 2020/5/21
(6) Japan Road Association: Dorokozorei no Kaisetsu to Unyo, Japan Road Association, 667p., (2004) (in Japanese)
(7) Japan LED Association: LED Shomei Handobukku (Kaiteiban), Ohmsha, Ltd., 248p., (2011) (in Japanese)

Author (organization or company)

Tokujiro KIZAKI(Honda Motor Co., Ltd.)、Hirotaka SATO(Honda Motor Co., Ltd.)

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