System for communicating between a trailer tracking device, a truck tracking device, and a central monitoring station
US8760274B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2012 |
| Grant date | Jun 24, 2014 |
| Priority date | — |
| Expiry date | Nov 29, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/20
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
When a cargo trailer is coupled to a truck, a trailer tracking device on the trailer acquires an identifier of a truck tracking device attached to the truck. The trailer tracking device then transmits a message to a central server indicating that the trailer is coupled to the truck, which message includes the identifiers of the two tracking devices. The central server associates the identifiers of the two tracking devices in a database. When the trailer is decoupled from the truck, the trailer tracking device transmits a message to the central server indicating that the trailer is decoupled. The trailer tracking device then goes into a sleep mode until the trailer is again coupled to a truck, a predetermined time interval expires, a motion sensor indicates trailer movement, location coordinates indicate a geofence violation, or a low battery voltage condition occurs. Upon any of these events, the trailer tracking device wakes up and transmits to the central server a message indicating which situation caused the transmission and including the location coordinates of the trailer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.