Wireless link and a vehicle electrical system using the same
Provided is an electrical communication link between a tractor and a trailer, the trailer comprising one or more auxiliary electrical devices, the electrical communication link including a first transceiver coupled to the tractor and configured to receive a first signal from the tractor and to wirelessly transmit a control signal corresponding to the first signal, a second transceiver coupled to the trailer and configured to wirelessly receive the control signal and to transmit a second signal corresponding to the control signal to the one or more auxiliary devices.
1. An electrical communication link between a tractor and a trailer, the trailer comprising one or more auxiliary electrical devices, the electrical communication link comprising:
a first transceiver coupled to the tractor and configured to receive a first signal from the tractor and to wirelessly transmit a control signal corresponding to the first signal; and
a second transceiver coupled to the trailer and configured to wirelessly receive the control signal and to generate a second signal corresponding to the control signal for transmission to the one or more auxiliary devices; and
a controller at the trailer and coupled between the second transceiver and the one or more auxiliary devices, the controller being configured to activate the one or more auxiliary devices based on the second signal generated by the controller,
wherein the controller is further configured to detect a presence of an electrical-power-carrying harness coupled to junction boxes of the tractor and trailer, to determine that power supplied by the harness is sufficient to power the auxiliary devices that are activated, to supply electrical power to the second transceiver from the harness in response to the determinations, and to supply electrical power to the second transceiver from a battery of the trailer in response to determining that the harness is not present or that the power supplied by the harness is insufficient to power the auxiliary devices.
2. The electrical communication link of claim 1 ,
wherein the second transceiver is further configured to receive a third signal indicative of a state of the one or more auxiliary devices and to wirelessly transmit a feedback signal corresponding to the first signal, and
wherein the first transceiver is further configured to wirelessly receive the feedback signal and to transmit a fourth signal corresponding to the feedback signal to the tractor.
3. The electrical communication link of claim 2 , wherein the feedback signal comprises diagnostic data indicative of a fault condition in the one or more auxiliary devices.
4. The electrical communication link of claim 1 ,
wherein the first transceiver is further configured to couple to a multi-pin socket of a tractor junction box, and
wherein the second transceiver is further configured to couple to a multi-pin socket of a trailer junction box.
5. The electrical communication link of claim 1 , wherein the one or more auxiliary devices comprise at least one of a stop light, a turn signal, a brake light, a trailer exterior light, a trailer interior light, and an anti-lock braking system.
6. The electrical communication link of claim 1 , wherein each of the second transceiver and the one or more auxiliary devices are configured to receive electrical power from the battery of the trailer.
7. The electrical communication link of claim 1 , wherein the first and second transceivers are coupled to the junction boxes at the tractor and trailers, respectively.
8. An electrical system for communicating signals between a tractor and a trailer, the electrical system comprising:
a first transceiver coupled to the tractor and configured to receive a first signal from the tractor and to wirelessly transmit a control signal corresponding to the first signal;
a second transceiver coupled to the trailer and configured to wirelessly receive the control signal and to generate a second signal corresponding to the control signal for transmission to one or more auxiliary devices;
a battery coupled to the trailer and configured to power the second transceiver; and
a controller at the trailer and coupled between the second transceiver and the one or more auxiliary devices, the controller being configured to activate the one or more auxiliary devices based on the second signal generated by the controller,
wherein the controller is further configured to detect a presence of an electrical-power-carrying harness coupled to junction boxes of the tractor and trailer, to determine that power supplied by the harness is sufficient to power the auxiliary devices that are activated, to supply electrical power to the second transceiver from the harness in response to the determinations, and to supply electrical power to the second transceiver from the battery in response to determining that the harness is not present or that the power supplied by the harness is insufficient to power the auxiliary devices.
9. The electrical system of claim 8 ,
wherein the second transceiver is further configured to receive a third signal indicative of a state of the one or more auxiliary devices from the controller and to wirelessly transmit a feedback signal corresponding to the first signal, and
wherein the first transceiver is further configured to wirelessly receive the feedback signal and to transmit a fourth signal corresponding to the feedback signal to the tractor.
10. The electrical system of claim 8 , wherein the controller comprises a switching network configured to couple the one or more auxiliary devices to the battery based on the second signal.
11. The electrical system of claim 8 , wherein the controller comprises a sensor configured to monitor a voltage of the battery.
12. The electrical system of claim 11 , wherein the controller is configured to generate a fault signal when the voltage of the battery is below a threshold.
13. The electrical system of claim 12 , wherein the first and second transceivers are configured to transmit the fault signal to the tractor.