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International Journal of Automotive Technology 2003;4(2): 57-64. |
| DEVELOPMENT OF INTELLIGENT POWER UNIT FOR HYBRID FOUR-DOOR SEDAN |
| K. AITAKA, M. HOSODA, T. NOMURA |
| Honda |
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| ABSTRACT |
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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, 12V DC-CD converter efficiency was increased by utilizing soft-switching, and the internal resistnace 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 separated 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 IPC by 42% compared to the former model. |
| Key Words:
Battery, Cooling, DC-DC, Efficiency, HEV(hybrid electric vehicle), Inverter |
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