Fail-safe speed sensor for London Transport automatic trains
Fail-safe speed sensor for London Transport automatic trains
- New search for: Hill, R.J.
- New search for: Hill, R.J.
An electromagnetic speedsensor has been developed for use in automatic-train control on London Transport railways. The primary sensing element is a composite ferromagnetic-conductive rotor which introduces amplitude modulation, with frequency proportional to train speed, into a fixed audiofrequency carrier. A number of discrete rotational speeds are then defined by demodulation and low-pass filtering. An override system, operating by reducing the amplitdue of a further AC signal with increasing train speed, provides integrity at low speeds, and a magnetic voltage reference unit maintains the power supply within predetermined safe limits. Fail-safe design principles are applied extensively on both component and system levels.
Document information
Fail-safe speed sensor for London Transport automatic trains
Betriebssicherer Drehzahlgeber fuer London Transport automatic trains
IEE Proceedings, Part B (Electric Power Applications) ; 128 , 6 ; 277-284
1981
8 Seiten, 10 Bilder, 1 Tabelle, 19 Quellen
Article (Journal)
English
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