Importance

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Abstract

An AC signal filter useful in a truck tractor equipped with power line communication for indicating in the tractor the status of an automatic braking system (ABS) in a trailer to which the tractor can be connected. The filter comprises a first power line carrying DC power connected between the tractor battery and a tractor ABS module. A second power line carrying DC power is connected from the tractor battery to a tractor connecting to a trailer ABS module. A first inductor is coupled in the first power line to block the passage of AC signals from the tractor ABS to the tractor battery, but permit the passage of DC current from the tractor battery to the tractor ABS module. A second inductor is coupled in the first power line to block the passage of AC signals from the trailer ABS module to the tractor battery but permit the passage of DC current from the tractor battery to the trailer ABS module. A capacitor is coupled between the first and second power lines for communicating AC signals between the tractor ABS module and the trailer ABS module.

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First Claim