Tractor-trailer coupling detection

Details Tractor-trailer coupling detection Tractor-trailer coupling detection

2011-03-22

2011-03-22

Crosland, Donnie L (Department: 2612)

Communications: electrical

Land vehicle alarms or indicators

For trailer

C340S428000, C340S509000, C340S510000, C340S514000, C340S687000, C307S009100, C280SDIG014, C303S001000

Reexamination Certificate

active

07911330

ABSTRACT:
To test whether a trailer is coupled to a tractor when the tractor ignition switch is off, a test switch in the trailer connects a high-impedance power source in a trailer to a line carrying energy from the tractor ignition switch to the trailer's electrical load, and measures the voltage at the line. A high voltage indicates a connection only to the electrical load in the trailer and thus a decouple. A low voltage indicates a measurement of the electrical loads in both trailer and tractor and hence a coupling.

REFERENCES:
patent: 6130487 (2000-10-01), Bertalan et al.
patent: 6466028 (2002-10-01), Coppinger et al.
patent: 2005/0017856 (2005-01-01), Peterson
patent: 2006/0261935 (2006-11-01), McAden

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