Electric power system for vehicle

Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile

Reexamination Certificate

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Reexamination Certificate

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07977812

ABSTRACT:
An ECU in an electric power system for a vehicle controls a DC-DC converter so that an alternator transmits a residual generated electric power to a sub battery while a terminal voltage of a main battery is maintained within an optimally specified voltage range. This residual generated electric power is obtained by subtracting from a maximum generating electric power of the alternator an electric power to be consumed by electric loads and an electric power with which the main battery is charged. This can suppress any fluctuation of the voltage of electric power of the electric power system, namely, the output voltage of the alternator and the voltage of the main battery, and perform a maximum regenerative electric power generation. The sub battery is efficiently changed with the regenerative electric power.

REFERENCES:
patent: 55-52779 (1980-12-01), None
patent: 6-296332 (1994-10-01), None
patent: 2002-176704 (2002-06-01), None
patent: 2002176704 (2002-06-01), None
patent: 2006-101588 (2006-04-01), None
patent: 2007-159236 (2007-06-01), None
patent: 2007159236 (2007-06-01), None
Japanese Office Action dated Oct. 29, 2009, issued in corresponding Japanese Application No. 2007-300471, with English translation.

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