Method and apparatus for displaying a residual electric charge o

Details Method and apparatus for displaying a residual electric charge o Method and apparatus for displaying a residual electric charge o

1991-09-30

1994-10-04

Wieder, Kenneth A.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

324433, 320 48, 340636, 364483, G01N 27416

Patent

active

053529820

ABSTRACT:
In a method and apparatus for displaying a residual electric charge for a battery of an electrically driven vehicle, the battery's capacity is detected after the battery is charged. This information is utilized by a residual electric charge meter to indicate a fully charged state of the battery. As the battery begins to supply current to the electric loads, dissipated power is calculated from the product of the value of the current and the length of time during which the current has been supplied. This calculated dissipated power is subtracted from the fully charged capacity from time to time in order to derive the residual electric charge. The battery residual electric charge meter is driven in accordance with the derived value to indicate a current residual electric charge. As such, the battery residual electric charge meter displays values which depend upon the actual fully charged capacity and a residual charge.

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