Method for remotely determining and managing connection of tractor and trailer
Truck tractors in a transportation fleet include a transponder that transmits a unique tractor identifier to a connected trailer using a Power Line Communication (PLC) bus device. The information transmitted typically includes a manufacturing unique ID for the tractor and an optional user defined ID. The user defined ID may include a fleet division code. The tractor ID and/or fleet ID codes determine how the trailer is hooked up. In particular, with detection of a connected state signal from the PLC bus, together with receipt of tractor identification code(s) from the tractor, the trailer tracking device can now communicate the coupling event information to a centralized location, such as via a cellular telephone connection.
1. An apparatus for determining the connection of a cargo trailer to a tractor comprising:
a tractor identification unit for providing a tractor identification information comprising a fleet code;
a power line communication bus for receiving the tractor identification information and communicatively coupled to the tractor identification unit;
a trailer tracking device, coupled to receive data from the power line communication bus and to receive the tractor identification information from the tractor identification unit, for combining the tractor identification information with its own trailer identification information to provide a tractor/trailer pairing data;
a wide area wireless data link for permitting the trailer tracking device to communicate the tractor/trailer pairing data to a central location; and
a receiver for receiving the tractor/trailer pairing data at the central location.
2. An apparatus as in claim 1 wherein the tractor identification information includes a user defined identification field.
3. An apparatus as in claim 2 wherein the user defined identification field is the fleet code.
4. An apparatus as in claim 1 wherein the central location additionally comprises a data processing system configured to determine correctness of a pairing of the tractor and the trailer using the tractor/trailer pairing data.
5. An apparatus as in claim 4 wherein if the pairing of the tractor and the trailer is determined to be incorrect, then an intervening action is taken before the trailer is moved.
6. An apparatus as in claim 3 wherein the fleet code is examined to determine if an unauthorized tractor has been hooked to the trailer.
7. An apparatus as in claim 1 wherein an uncoupling event is determined to have occurred if the tractor does not report the tractor identification information to the trailer tracking device.
8. An apparatus as in claim 1 wherein the tractor identification unit periodically provides the tractor identification information over the power line communication bus to the trailer tracking device, and the trailer tracking device determines that a coupling status has not changed as long as codes associated with the tractor identification unit are received.
9. An apparatus as in claim 8 additionally wherein upon multiple successive failures to receive tractor identification information, the trailer tracking device is configured to determine that a coupling between the tractor and the trailer no longer exists.
10. An apparatus as in claim 4 wherein the determination of correctness is made at the central location by comparing the tractor identification information and the trailer identification information against a list of allowed combinations.
11. An apparatus as in claim 1 wherein a determination of an incorrect pairing of the tractor and the trailer is made at the trailer tracking device by comparing a fleet code received from the tractor against a known authorized fleet code specified for the trailer.
12. An apparatus as in claim 1 wherein the wide area wireless data link comprises a wireless link on a cellular telecommunication network.
13. An apparatus as in claim 1 wherein the wide area wireless data link comprises a wireless link on a satellite network.
14. An apparatus as in claim 1 wherein the tractor/trailer pairing data comprises the fleet code.