Circuit for preventing the erroneous operation of a motor control device for lifting and lowering a power window
US4746845A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 1986 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Oct 16, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0851
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An automatic window regulator for automobiles includes a drive motor for lifting and lowering the window glass, and a detector for detecting when there is a foreign object jammed between the window glass as it is lifted or lowered and a window frame. The detector includes sensor means for measuring motor characteristic values of the drive motor and comparator means for comparing a first motor characteristic value measured by the sensor means with a second motor characteristic value measured by the sensor means a prescribed period of time prior to the first motor characteristic value and for generating a detected signal indicative of the jammed foreign object when any difference between the compared first and second motor characteristic values is greater than a predetermined range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.