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Development of an Intelligent Power Unit for the Civic Hybrid

Article of Honda R&D Technical Review Vol.14 No.2

Summary

The Intelligent Power Unit (IPU) utilized in Honda’s Civic Hybrid Integrated Motor Assist (IMA) system was developed with the aim of making every component lighter, more compact and more efficient than those in the former model. To reduce energy loss, inverter efficiency was increased by fine patterning of the Insulated Gate Bipolar Transistor (IGBT) chips, 12 V DC-DC converter efficiency was increased by utilizing soft-switching, and the internal resistance of the IMA battery was lowered by modifying the electrodes and the current collecting structure. These improvements reduced the amount of heat generated by the unit components and made it possible to combine the previously separate Power Control Unit (PCU) and battery cooling systems into a single system. Consolidation of these two cooling circuits into one has reduced the volume of the newly developed IPU by 42% compared to the former model.

Reference

(1) Matsuki, M., Wakashiro, T., Kamiyama, T., Sato, T., Kaku, T., Kanda, M.: Development of a New Power Train for the Civic Hybrid, Honda R&D Technical Review, Vol. 14, No. 1 April 2002

Author (organization or company)

Kazuhiko AITAKA(Tochigi R&D Center)、Masaharu HOSODA(Tochigi R&D Center)、Takuya NOMURA(Tochigi R&D Center)

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