Apparatus for calculating quantity indicating charged state...

Details Apparatus for calculating quantity indicating charged state... Apparatus for calculating quantity indicating charged state...

2007-02-26

2010-06-08

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

C320S132000, C320S133000, C324S430000, C324S432000

Reexamination Certificate

active

07733063

ABSTRACT:
An apparatus is provided to calculate a quantity indicating a charged state of an on-vehicle battery. The battery powers a starter starting up an on-vehicle engine. In the apparatus, a plurality of pairs of data consisting of current and voltage of the battery are acquired at predetermined sampling intervals during a cranking period of the engine in response to starting up the starter. At intervals, a value of an internal resistance of the battery is calculated based on the plurality of pairs of data of current and voltage. The internal resistance is one kind of the charged-state indicating quantity. An open voltage difference is calculated, which is a difference between a pseudo circuit-open voltage of the battery given before starting up the starter and a pseudo circuit-open voltage of the battery given after the cranking period. The value of the internal resistance is corrected using the open voltage difference.

REFERENCES:
patent: 697 30 677 (2005-09-01), None
patent: A 2002-168929 (2002-06-01), None
patent: A 2002-343444 (2002-11-01), None
patent: A-2005-065482 (2005-03-01), None
patent: A 2005-146939 (2005-06-01), None
Mar. 9, 2010 Office Action issued in German patent application No. 10 2007 009 041.4-35 (with translation).

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