Motor speed-based anti-pinch control apparatus and method
US6822410B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2002 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | Aug 19, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H1/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The apparatus and method includes a panel movable between at least two positions. An electric motor has a rotating armature. A multiple pole magnet is mounted on the armature. A sensor detects the passage of each magnet pole and generates an output signal. A control measures time periods between each pole passage. An average time period is computed over a predetermined number of time periods. The difference between average time periods is computed and compared with a threshold difference to determine if an obstacle is present in the path of movement of the panel. Transient counts are accumulated for increasing average time periods over a number of time period samples as a measurement of the force exerted on an obstacle by the panel to detect an obstacle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.