Transponder system for communicating with a vehicle tire
US5541574A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1993 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | Dec 22, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/07764
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A tire transponder system seats a transponder coil in a flexible resilient tube that is positioned around a vehicle wheel. The transponder antenna is lodged in a groove that extends around the tube, and responds to an excitation signal by transmitting a signal that contains identification information and/or information on the tire condition. For tire condition information, a diode is connected in circuit with the transponder coil to double the frequency of the signal returned by the transponder. A switch that is connected to bypass the diode is operated by a tire condition sensor, such as a pressure sensor, when the sensed condition crosses a threshold level in a predetermined direction. The change in the frequency of the transponder's returned signal when the threshold has been crossed is used to activate a response such as a low tire pressure alarm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.