Fast search algorithm for finding initial diffusion voltage...

Details Fast search algorithm for finding initial diffusion voltage... Fast search algorithm for finding initial diffusion voltage...

2008-01-23

2011-11-08

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Time control

C320S104000, C320S136000, C903S903000

Reexamination Certificate

active

08054046

ABSTRACT:
A method for rapidly determining an initial diffusion voltage (Vdiff)initialas a starting point in calculating a diffusion voltage in an electro-chemical cell (e.g., a battery used in an automotive vehicle) includes obtaining a time difference toffbetween a time when the cell was last turned-OFF and a time when the cell was next turned-ON, selecting a starting diffusion voltage (Vdiff)startbased on toff, determining a trial diffusion voltage Vdiffbased on a diffusion circuit model and (Vdiff)start, calculating an error voltage Verror=(Vdiff)−|VOFF−VON| where VOFFand VONare cell voltages at turn-OFF and turn-ON respectively, repeating the foregoing determining and calculating steps using for each iteration (Vdiff)start=(Vdiff)previous+Verroruntil Verroris less than or equal to a first predetermined tolerance amount ε, storing in a memory a value of Vdiffcorresponding to the condition Verror≦ε, and setting (Vdiff)initialequal to the just stored value of Vdiff. A further diffusion voltage Vdiffis then determined using the same diffusion circuit model and the just obtained (Vdiff)initialand is advantageously used by a controller in an electric propulsion vehicle to determine a state of charge of the propulsion battery.

REFERENCES:
patent: 6016047 (2000-01-01), Notten et al.
patent: 6639385 (2003-10-01), Verbrugge et al.
patent: 2004/0162683 (2004-08-01), Verbrugge et al.
patent: 2005/0248315 (2005-11-01), Hartley et al.

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