Vehicle zero speed detection system

Details Vehicle zero speed detection system Vehicle zero speed detection system

1974-09-09

1976-05-15

Blix, Trygve M.

Railway switches and signals

Cab signal or train control

Speed-control systems

246167R, B61L 300

Patent

active

039587835

ABSTRACT:
A signal transmitter provides an oscillatory signal to an antenna situated along a vehicle stopping area. The antenna has incremental transpositions along its length for reversing the phase of the magnetic field produced at each transposition in response to the provision of the oscillatory signal. Signal receiving means on a vehicle sense the phase reversals of the magnetic field, and when the phase reversals are sensed at a rate proportional to a defined zero speed of the vehicle, at least one door on the vehicle is opened.

REFERENCES:
patent: 3229086 (1966-01-01), Allison
patent: 3334224 (1967-08-01), Allen
patent: 3349303 (1967-10-01), Burnight
patent: 3727046 (1973-04-01), Woods
patent: 3728539 (1973-04-01), Thorne-Booth

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