Tractor-trailer coupling detection
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United States of America Patent
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Apr 22, 2014
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N/A
app pub date -
Jan 10, 2011
filing date -
Mar 22, 2007
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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.
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