Window opening and closing apparatus
US6100658A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1998 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | May 19, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H1/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rotational speed sensor generates pulses having a period proportional to the speed of a motor, while a pulse period calculator section calculates the period of the pulses. A jamming determination section calculates the motor load based on the pulse period and detects that an object is jammed when the load exceeds a predetermined threshold. Once it has been judged than an object is jammed, a drive control section stops and controls the motor for reverse rotation, thereby releasing the object. A door opening and closing detection section further detects the opening or closing operation of a door which is one disturbance factor. If the door is opened or closed, an inhibit control section inhibits jamming judgment for a predetermined period of time thereafter. This prevents an incorrect judgment due to the opening or closing of the door.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.