Communicating vital control signals
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United States of America Patent
Stats
-
Apr 5, 1988
Grant Date -
N/A
app pub date -
Aug 4, 1987
filing date -
Aug 16, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A railway vehicle control system comprises a railway track (1) and a plurality of transponders (N, N+1, N+2) at predetermined positions along the track. A railway vehicle (2) moves along the track, the vehicle having means (20, 21) for detecting each of the transponders. A control location has means (4, 5, 6, 7, 7a) for periodically transmitting vital safety signalling information to the vehicle via a radio link. In response to detection of one of the transponders, the vehicle sends a first message via the link to the control location and in response to reception of the first message by the control location, the vital safety signalling information is sent a first time from the control location to the vehicle via the link, then from the vehicle to the control location via the link and then a second time from the control location to the vehicle via the link.
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