Railway switches and signals – Electric actuation – Car-actuated circuit controllers
Patent
1987-07-06
1988-11-29
Reeves, Robert B.
Railway switches and signals
Electric actuation
Car-actuated circuit controllers
246 28F, 246 77, 246122R, 340933, B61L 116
Patent
active
047875810
ABSTRACT:
A train detection system is disclosed which works on the axle-counting principle and in which preprocessing units each containing a two-microprocessor system are associated with the individual detection points. Along the track, a major number of preprocessing units are connected with a central evaluation unit which interrogates the preprocessing units for stored counts on a cyclic basis. This interrogation is performed separately for each microprocessor of a preprocessing unit. In addition to containing counts, data telegrams transmitted to the evaluation unit include functional characters which make it possible to check the correct functioning of the detection points and preprocessing units at short intervals.
REFERENCES:
patent: 3450875 (1969-06-01), Whitten et al.
patent: 3740549 (1973-06-01), Thorne-Booth
patent: 3771119 (1973-11-01), Evans
patent: 3870990 (1975-03-01), Fathauer
patent: 4128218 (1978-12-01), Pohlig
patent: 4179744 (1979-12-01), Lowe
patent: 4283031 (1981-08-01), Finch
patent: 4494717 (1985-01-01), Corrie et al.
patent: 4498650 (1985-02-01), Smith et al.
patent: 4581700 (1986-04-01), Farnham et al.
Dobler Karl U.
Uebel Helmut
ALCATEL N.V.
Reeves Robert B.
Werny Scott H.
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