Railway switches and signals – Cab signal or train control – Speed-control systems
Patent
1975-05-27
1977-01-04
Kunin, Stephen G.
Railway switches and signals
Cab signal or train control
Speed-control systems
2351502, 235 92CC, 235 92SH, B61L 320
Patent
active
040008720
ABSTRACT:
Clock pulses representative of the velocity error between desired and actual train speeds drive an advance train line (ATL) register to count up or down, in accordance with the sign of the error, between zero and a selected maximum count position. The existing total count is continuously applied to a D/A converter to provide a stepped analog signal which drives an advance train line channel to vary the propulsion effort of the train, car by car, to the next adjacent level, increasing or decreasing per the direction of the counting action. Attainment of either count limit by the ATL register generates, through logic circuitry, a clock pulse to drive the associated propulsion train line (PTL) encoder in the same direction to its next propulsion condition. The ATL register is reset to the opposite count limit during generation of the PTL clock pulse, to continue the stepped variation of the propulsion level in the same direction. The previously achieved full ATL propulsion level is meanwhile held until the PTL encoder shifts to the equivalent base condition. All ATL counting action is inhibited by various saturated conditions within the PTL encoder.
REFERENCES:
patent: 3268727 (1966-08-01), Shepard
patent: 3482089 (1969-12-01), Raffel et al.
patent: 3800139 (1974-03-01), Clark
patent: 3891833 (1975-06-01), Rhoton et al.
Kunin Stephen G.
McIntire, Jr. R. W.
Westinghouse Air Brake Company
Williamson, Jr. A. G.
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