Proving safe operation system for automatic train

Details Proving safe operation system for automatic train Proving safe operation system for automatic train

B - Operations, Transporting

61

L

328/177, 346/44

B61L 1/18 (2006.01) B61L 1/20 (2006.01) G01R 31/28 (2006.01) H03K 19/007 (2006.01)

Patent

CA 1217848

- 14 - Abstract Proving Safe Operation To ensure the safe operation of an electronic circuit, for example an amplitude modulated carrier signal generator, an output of the circuit is analysed to prove the presence of predetermined signal characteristics, for example the carrier signal, or a modulation frequency. The predetermined signal alternatively may be superimposed on an input to the electronic signal and proved subsequently to be present in the output. The output of the circuit is passed inhibited, according to whether or not the signal characteristics are proved present, by means of an output enable gate which is self-latching providing the output continuous to be proved correct. A start-up circuit delays a possible inhibit for a limited period following initial power connection to the circuit in order that the output can become established.

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