Method and apparatus for tire pressure monitoring and for shared keyless entry control
US5463374A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1994 |
| Grant date | Oct 31, 1995 |
| Priority date | — |
| Expiry date | Mar 10, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C23/0462
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Vehicle tires each contain a sender including a microprocessor, a radio transmitter, a pressure detector and a magnetic switch for sending a radio signals indicating sender ID, pressure data and change of switch state. An on-board receiver unit having a microprocessor evaluates the transmitted data and displays pressure condition information. A portable magnet is placed near each tire, in turn, to operate the magnetic switches, resulting in a sequential transmission of sender ID codes which allows the receiver unit to learn the tire position of each sender. An inertia switch in the tire triggers a radio transmission and the receiver unit considers the absence of a transmission when expected as a failure and displays a service needed message. A remote portable sender transmits signals for door unlocking or locking, trunk opening and interior light control. The receiver unit responds to the signals and issues commands to appropriate actuators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.