| 摘要 |
The present invention relates to a fleet management system for managing and monitoring the status of a fleet of vehicles. A status monitoring system for providing trailer status data to a tractor from a trailer connected to the tractor is provided. The system comprises a data transmitter positioned on-board the trailer. The data transmitter has an electronic load that is connected across a specific first circuit of the trailer that is connected to a corresponding second circuit of the tractor when the trailer is coupled to the tractor. Further, the transmitter has encoding means for controlling the load as a function of time in such a way that load current drawn by the load from the first and second circuits varies as a specific function of time. The function identifies a specific status value of the trailer. Further, the system comprises a data receiver positioned on-board the tractor. The data receiver has a current sensor for providing a sensor signal corresponding to the load current flowing in the second circuit as a function of time, and a processor connected to the current sensor for receiving the sensor signal and based on the sensor signal identifying the status value of the trailer connected to the tractor corresponding to the load current as a function of time. The system requires minimum modifications to the existing tractor-trailer electrical wiring and it may be connected to a type of signal lines that is provided in any tractor-trailer vehicle. |
