Battery condition diagnosis apparatus
US8140280B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 19, 2006 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Jul 8, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/386
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A battery condition diagnosis apparatus for a vehicle gradually supplies electricity to an electric motor of an electric power steering apparatus when a predetermined time elapses after an ignition switch is turned off. The apparatus diagnoses the deteriorated condition of the battery on the basis of the amount of supplied electricity and the detected battery voltage which changes in accordance therewith. The electric motor may be a brushless DC motor. In this case, current is supplied to the electric motor such that only d-axis armature current Id in the d-q coordinate system flows, to thereby prevent the electric motor from rotating, whereby safety is secured. Accordingly, the condition of the battery can be accurately diagnosed by supplying electricity to the electric motor without changing the condition of the vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.