Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Patent
1980-06-24
1982-04-13
Groody, James J.
Railway switches and signals
Electric automatic highway signals, mine doors, and gates
246 28C, 246 34R, 246 34A, 246 34CT, 246121, 246128, B61L 102
Patent
active
043243762
ABSTRACT:
A railroad highway crossing warning system including pickup coils for sensing current flowing in the track rails of an approach zone, a circuit for sensing the voltage across the track rails, band-pass filter circuits for filtering the voltage and current derived from the track rails, impedance calculator circuits for calculating the track impedance, phase detector circuits for detecting the phase angle between the voltage and current, a multiplier circuit for linearizing the track impedance by multiplying the track impedance by a function of the phase angle, a data sampler circuit for sampling the linearized track impedance at given periodic intervals, a motion detector and crossing predictor circuit for detecting the motion of a train and for predicting the time of arrival at the crossing by comparing the predicted time of arrival with an advanced warning time, and a logic gate circuit for activating the warning apparatus at the crossing when the predicted time of arrival is less than the advanced warning time.
REFERENCES:
patent: 3246143 (1966-04-01), Steele et al.
patent: 3333096 (1967-07-01), Ohman et al.
patent: 3610920 (1971-10-01), Frielinghaus
patent: 3696243 (1972-10-01), Risely
patent: 3781542 (1973-12-01), Brockman
patent: 3977634 (1976-08-01), Smith
patent: 3987989 (1976-10-01), Geiger
American Standard Inc.
Groody James J.
Sotak J. B.
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