Remaining battery capacity measuring method and apparatus

Details Remaining battery capacity measuring method and apparatus Remaining battery capacity measuring method and apparatus

1996-04-05

1997-04-01

Trammell, James

Boots, shoes, and leggings

364481, 324427, 324428, 320 48, G01R 1900, H02J 704

Patent

active

056173245

ABSTRACT:
A remaining battery capacity measuring apparatus comprises: a voltage-current change trend calculating section (21) for detecting dispersive terminal voltages and discharge currents of a battery; a voltage-current approximate linear function calculating section (25) for calculating an approximate linear function indicative of a trend of the detected dispersive terminal voltages and discharge currents; a correlation coefficient calculating section (28) for calculating a correlation coefficient between the detected dispersive terminal voltages and discharge currents; a correlation coefficient deciding section (29) for deciding whether the calculated correlation coefficient less than a negative reference value can be calculated continuously or not, and for enabling the voltage-current approximate linear function calculating section (25) to output the calculated approximate linear function, only when the correlation coefficient less than the negative reference value can be calculated continuously; and a remaining battery capacity calculating section (23) for calculating a remaining battery capacity on the basis of a terminal voltage corresponding to a reference discharge current along the outputted approximate linear function.

REFERENCES:
patent: 4558281 (1985-12-01), Codd et al.
patent: 5032825 (1991-07-01), Kuznicki
patent: 5287286 (1994-02-01), Ninomiya
patent: 5321627 (1994-06-01), Reher
patent: 5404106 (1995-04-01), Matsuda
patent: 5406266 (1995-04-01), Mino et al.
patent: 5473262 (1995-12-01), Yoshimatsu
patent: 5479085 (1995-12-01), Honda et al.

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