Railway switches and signals – Grade-crossing track protection – Automatic
Reexamination Certificate
2006-11-21
2006-11-21
Le, Mark T. (Department: 3617)
Railway switches and signals
Grade-crossing track protection
Automatic
C246S00100C, C246S12200A, C246S47300R, C246S117000, C701S019000
Reexamination Certificate
active
07137600
ABSTRACT:
A method for automatic train control in a digitally controlled model railroad system includes detecting a polarity change of a track voltage applied to the track by means of a digitally controlled motor vehicle running on the track. The track voltage being a modulated control voltage which is normally symmetric and asymmetric in galvanically isolated track sections. After each detection of a change of polarity, the voltage level of the control voltage applied to the track is sampled independently for each rail of the track by means of the digitally controlled motor vehicle running on the track. The voltage values sampled for each rail of the track are compared to each other and evaluated with regard to any asymmetry occurring in the amplitude of the track voltage with reference to each rail of the track. Depending on the result of the evaluation, the travel operation of the motor vehicle is influenced that is otherwise controlled by the digital control system.
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Le Mark T.
Lenz Elektronik GmbH
Quarles & Brady LLP
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