Multiplexed trailer light system
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United States of America Patent
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-
May 28, 1996
Grant Date -
N/A
app pub date -
Aug 17, 1994
filing date -
Aug 17, 1994
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An encoder and decoder (multiplexer and demultiplexer) are used to control the rear operating lights (e.g., turn, brake, or running lights) of a trailer towed on the roads behind a tractor vehicle. Voltages powering the tractor vehicle's rear lamps are the inputs to a combinational logic unit with gates (AND, OR, etc.) for interfacing between different lighting systems on the tractor and trailer. The logic unit's outputs are fed to an encoder which converts the parallel outputs to serial data. The data are sent over a single wire to the decoder, mounted on the trailer. The decoder regenerates the parallel signals to control switches (power transistors) driving the trailer lamps with power from the vehicle battery.
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