SU1532349A1 - Arrangement for detecting the skidding of wheel pairs of rolling stock - Google Patents

Abstract

The invention relates to railway transport, in particular to systems for detecting the use of wheel pairs of rolling stock, and permits an increase in speed. The device contains an alternating current generator 1, a differentiator 2 and a comparator 3. The voltage from the output of generator 1 is fed to the input of integrator 4 and the third comparator 6, which generates pulses that coincide in phase, frequency and duration with the input voltage. The integrator 4 integrates the input voltage for a time while the pulse from the third comparator 6 is present at its installation input and then is reset to the zero state. The voltage from the output of the integrator 4 is fed to the input of the second comparator 5, which, when it exceeds the threshold value, generates at the output pulses that coincide in frequency with the voltage of the generator 1 and are out of phase by 90 el. hail. These pulses, arriving at the synchronous input 9 D-flip-flop 7, synchronize the front of the device. The information input 8 of D-flip-flop 7 receives a signal from the output of the first comparator 3, which at the moments of synchronization compares the value of the measured acceleration with the threshold value. When the threshold is exceeded at these moments, D-flip-flop 7 is switched to a single state, and the high potential at its output signals the presence of a user. 2 Il.

Description

The invention relates to railway transport and may be. used dp detection yuz wheelset rolling stock.

The purpose of the invention is to increase the speed.

FIG. Figure 1 shows a block diagram of a device for detecting the use of wheel pairs of rolling stock; in fig. 2 - time diagram, explaining the principle of its work.

The device comprises an alternating current generator 1 mechanically connected to the axis of the wheelset, a differentiator 2 connected to the first comparator 3, as well as an integrator 4, the second and third comparators 5 and 6, and the D-flip-flop 7, information input 8 of which is connected to the output of the first comparator 3, and the synchronous input 9 is connected to the output of the second comparator 5, the input of which is connected to the output of the integrator 4, the installation input of which is connected to the output of the third comparator 6, and the information input is connected to the output of the alternating current generator 1.

The device works as follows.

An alternating current generator 1 (synchronous or inductor) produces a voltage U, (t), the frequency and amplitude of which is proportional to the speed of rotation of the wheelset

V (t) K,.

(one)

where K is a proportionality coefficient depending on the diameter of the wheel rim;

y is the angle of rotation of a point on the wheel rim;

U, (t) K, K sin y (t), y (t) N. y about c

(2)

where K is the proportionality coefficient determined by generator parameters; N is the number of pairs of poles of the alternator. The voltage) is fed to the input of the differentiator 2, on the code of which the voltage UnCt) is equal to

U (t) Tg (K, K4 -sin y (t) +

  ) cos y (t)

dt

(3)

Where

Constant differentiation;

five

-.- J-T °° b - angular deceleration, about t

The voltage Uj (t) is fed to the input of the first comparator 3, which compares it with a threshold voltage value Un equal to

 Or, (where

five

0

five

Nj Oflop

b „op is the deceleration threshold needed to provide protection against false positives. The synchronization of the operation of the device is carried out as follows.

The voltage U, (t) is fed to the input of the integrator 4 and the third comparator 6. The comparator 6 forms a sequence of square pulses Ue (t), whose frequency, duration and phase are equal to the corresponding voltage parameters (U) (t).

The integrator 4 integrates the voltage and (t) when there is a pulse Ug (t) at its installation input, and when it is not present, is reset to the zero state. Voltage (t) from the output of integrator 4, equal to (t)

U4 (t) j K, sin y (t) dt

0 v v.

Cos y (t) +

K, Ki T “

-t „

where t | - constant integration, is fed to the input of the second comparator 5, where it is compared with the threshold voltage Uj, equal to K4Kg

and

P

(6)

Thus, at the output of the second comparator a 5, a sequence of pulses U (t) is formed, the leading edge of which corresponds to the phase shift of the voltage U, (t) of the alternator 1 by 90 electragrad, cos (t) 0, i.e. y (t) n7 / 2, where n 1,3,5 ...

The pulses UjCt) are sent to the synchronous input 9 of the D-flip-flop 7, and its information input 8 receives the signal U3 (t) from the output of the first comparator 3. At the moment of a positive differential at the synchronous input 9 of the D-flip-flop 7, the first comparator 3 checks according to (3) and (4)

TeK ,, sinta + (/

tH 2

cos

(7)

/

Claims (1)

Claim A device for detecting the use of wheelsets of a rolling stock comprising an alternating current generator