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Research on Electric Power System for Honda FCX Fuel Cell Vehicle

Article of Honda R&D Technical Review Vol.15 No.2

Summary

An ultra capacitor has been utilized as a back up power source to give the Honda fuel cell vehicle acceleration performance rivaling that of a conventional vehicle. To control the difference in voltage between the two power sources at system start-up or takeoff from idling stop, a VCU (Voltage and current Control Unit) has been set between the fuel cell and the high-voltage device for the traction motor. The VCU charges the ultra capacitor gradually by chopping control of the current from the fuel cell equalizing the voltage of the fuel cell and the ultra capacitor. This prevents the occurrence of over-current at system start-up or takeoff from idling stop. When the ultra capacitor is being charged with regenerated braking energy, chopping control of the current from the fuel cell by the VCU electrically separates the fuel cell and the ultra capacitor, and the current from the fuel cell is restricted. This enables the energy provided by regeneration to be utilized for charging the ultra capacitor.

Reference

(1) Kawasaki, S., Ogura, M., Ono, T., Kami, Y.: Development of the Honda FCX Fuel Cell Vehicle, Honda R&D Technical Review, Vol. 15, No. 1, p. 1-6 (2003)
(2) Ogawa, T., Kimura, K., Uchibori, K., Fujimoto, S., Shimizu, K.: Development of New Power Train for Honda FCX Fuel Cell Vehicle, Honda R&D Technical Review, Vol. 15, No. 1, p. 7-12 (2003)
(3) Tamenori, K., Yamamoto, K., Anekawa, A., Taguchi, T., Kubota, S., Kawahara, M.: Development of Electric Double-layer Capacitor System for Fuel Cell Vehicle, Honda R&D Technical Review, Vol.15, No.1, p. 25-30 (2003)

Author (organization or company)

Hidekazu TAKENAKA(Tochigi R&D Center)

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