Access control device for a motor vehicle and method for setting the sensitivity of an access control device
US6556125B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1999 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Jul 19, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00793
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An access control device for a motor vehicle and a method for setting the sensitivity of an access control device, include a plurality of ferrite antennas disposed in a door handle of the motor vehicle. The individual ferrite antennas are inclined with respect to one another and with respect to the door surface. Consequently, a widely fanned magnetic field is produced within which a request signal can readily be received by a portable encoder. In order to ensure that interference signals have only little effect on the reception of a request signal, the reception sensitivity of the encoder is increased only after a very powerful advance signal has been received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.