Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1996-04-05
1997-12-16
Nguyen, Vinh P.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
324429, 324433, 320 48, 340636, G01N 27416
Patent
active
056989830
ABSTRACT:
The apparatus and method of the present invention measure the remaining capacity of a battery connected to a fluctuating load. The apparatus senses dispersive terminal voltages and dispersive discharge currents from the battery, and samples the sensed terminal voltages and discharge currents. On the basis of the sampled terminal voltages and discharge currents, the apparatus calculates a watt-hour value of the battery for a predetermined time interval, and checks whether the calculated watt-hour value reaches a predetermined value. If the calculated watt-hour value reaches the predetermined value, the apparatus calculates an approximate linear function indicative of a trend of the sampled terminal voltages and discharge currents, and calculates a voltage corresponding to a reference discharge current in accordance with the calculated approximate linear function as a remaining capacity voltage. The apparatus then converts the calculated remaining capacity voltage into an ordinate position on a two-dimensional display screen, and a calculated total watt-hour value into an abscissa position on the same display screen, and displays the positions in the form of a dot curve.
REFERENCES:
patent: 4849700 (1989-07-01), Morioka et al.
patent: 5287286 (1994-02-01), Ninomiya
patent: 5321627 (1994-06-01), Reher
patent: 5404106 (1995-04-01), Matsuda
patent: 5473262 (1995-12-01), Yoshimatsu
patent: 5479085 (1995-12-01), Honda et al.
patent: 5592094 (1997-01-01), Ichikawa
Arai Youichi
Kumagai Ryo
Shimoyama Kenichi
Takada Yoshihide
Do Diep
Nguyen Vinh P.
Yazaki -Corporation
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