Method and apparatus for displaying a residual electric charge of a battery for an electrically driven vehicle
US5352982A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1991 |
| Grant date | Oct 4, 1994 |
| Priority date | — |
| Expiry date | Sep 30, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S320/19
- WIPO fieldTransport
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.