Railway switches and signals – Cab signal or train control – Speed-control systems
Patent
1979-11-07
1981-07-21
Miller, J. D.
Railway switches and signals
Cab signal or train control
Speed-control systems
246187B, 246187C, B61L 300
Patent
active
042793955
ABSTRACT:
A pair of on-board processing units, operating in parallel, are supplied with input signals representing actual train speed, advance traffic conditions, and selected train parameters. Each unit continuously calculates a maximum train speed from which emergency braking will stop the train within the indicated clear track distance ahead. Each unit also compares the calculated maximum speed with actual train speed and emits a preselected distinctive frequency signal or a d.c. signal as actual speed is less than, or equals, or exceeds maximum speed, respectively. A logic network with parallel filter-rectifier circuit paths passes the unit outputs, if of the preselected frequencies, to a two-input AND gate whose output holds emergency braking released. If a preselected frequency output is absent from either or both units, due to actual speed equaling or exceeding maximum speed or to a fault condition in the apparatus, the corresponding lack of an AND gate output actuates emergency braking. Each processing unit monitors operation of the other unit so that, if a malfunction is detected, the operable unit, when input speed signals are within limits, also emits a second signal of the other unit frequency. This is passed through a separate filter rectifier circuit within the logic network and applied to the second input of the AND gate to maintain train movement.
REFERENCES:
patent: 2841745 (1958-07-01), Shields
patent: 3639754 (1972-02-01), Kovalcik et al.
patent: 3946973 (1976-03-01), Budway et al.
patent: 4015804 (1977-04-01), Dobler et al.
Bertone Andrea
Boggio Francesco
Tumolo Enzo
Eisenzopf Reinhard J.
Miller J. D.
WABCO Westinghouse Compagnia Italiana Segnali S.p.A.
Williamson, Jr. A. G.
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