Multiplexed trailer light system

Details Multiplexed trailer light system Multiplexed trailer light system

1994-08-17

1996-05-28

Pascal, Robert J.

Electric lamp and discharge devices: systems

Special application

Vehicle

315 80, 315 86, 340431, 340458, 340475, B60Q 126

Patent

active

055214665

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.

REFERENCES:
patent: 3864578 (1975-02-01), Lackey
patent: 4405190 (1983-09-01), Schroeder
patent: 4751431 (1988-06-01), Ducote
patent: 4857807 (1989-08-01), Hargis
patent: 5030938 (1991-07-01), Bondzeit
patent: 5198798 (1993-03-01), Lietzow et al.
patent: 5241241 (1993-08-01), Eccleston

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