Device for measuring the distance travelled by and the speed...

G - Physics – 01 – C

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354/25, 354/32

G01C 22/02 (2006.01) B60T 8/32 (2006.01) G01P 3/54 (2006.01)

Patent

CA 1268859

Abstract Device for Measuring the Distance Travelled by and the Speed of a Rail Vehicle A device for measuring the distance travelled by and the speed of a rail vehicle fitted with wheel-coupled distance-pulse generators is disclosed in which both distance and speed are calculated from the time distance between successive distance pulses, and in which the change in wheel diameter due to wheel wear is already taken into account in the measurement of the time distance between the distance pulses (distance- pulse intervals). To measure the distance-pulse inter- vals, clock pulses of reduced repetition rate are counted which are obtained by dividing basic clock pulses of high repetition rate in an adjustable divider (T1). The wheel diameter is taken into account by changing the division ratio of the adjustable divider by means of a coding switch (S1).

520059

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