SU1233268A1 - Device for selecting pulse sequence which has extremum frequency - Google Patents

Abstract

The invention can be used to prevent the vehicle from slipping and slipping to select a signal corresponding to the speed of the fastest or most slowly rotating wheelset. The device contains a source of the reference signal, n processing channels 2 and a generating unit 3. Each processing channel 2 includes an integrator 4, a memory block 5, a comparison block 6, a trigger 7, an OR element 8 and a pulse shaper 9. The introduction into the device of the source 1 of the reference signal, the formation of new connections between the elements of the device and the specific implementation of the formation unit 3 make it possible to reduce the time for processing the input signal. 1 hp f-ly, 4 ill. § (L 1CHE oo oo 1C x oo

Description

The invention relates to a pulse technique and can be used to prevent skidding and slipping of a transport medium, such as railway rolling stock, in order to extract a signal corresponding to the speed of the fastest or most slowly rotating wheelset.

The purpose of the invention is to increase the speed of the device by reducing the time for processing the input signal

Fig. 1 is a block diagram of a device for extracting a pulse sequence having an extreme frequency; FIG. 2 is a functional diagram of a vanilla unit for allocating a posg / frequency having a minimum frequency; on - timing diagrams explaining the operation of the device when selecting a sequence that has

maximum frequency; 4 I

the same, when selecting a sequence that has a minimum frequency.

A device for extracting a pulse sequence having an extreme frequency contains a source of a, aloh signal, n channels 2, 2.P processing and a shaping unit 3, the first input channels 2., .., 2.P processing are connected to the input buses of the device, the output of source 1 of the reference signal is connected to the second inputs of channels 2.:lf, .., 2.P processing, the outputs of which are connected to the inputs of formation unit 3, the output of which is connected to the output shihge of the device and to the third inputs of processing channels, each channel processing contains integrator 4, memory block 5, comparison block 6, trigger 7, element OR 8 and pulse shaper 9, the output of which is connected to the processing channel, the first input of which is connected to the first inputs of the integrator 4 and trigger 7, the second input of the processing channel is connected to the second input of the integrator 4, the output of the trigger 7 is connected to the first input of the element OR 8, i the output of which is connected to the input of the driver 9 pulses, and the second input of the element ШШ. 8 is connected to the output of the comparison unit 6, the first input of which is connected to the integrator 4 input and to the first

15

20

2332682

the input of the memory unit 5, the second input of which is connected to the second input of the trigger 7 and to the third input of the processing channel, and the output of the memory 5 section 5 is connected to the second input of the comparison unit 6.

When selecting a sequence that has a maximum frequency, the block

The forming unit contains a multi-input element OR, the inputs and output of which are connected respectively to the inputs and outputs of the forming unit,

When selecting a sequence that has a minimum frequency of the formation unit 3 (FIG. 2) contains an element AND 1 O to triggers 1.1, o., I.p, the outputs of which are connected to the element 4, the output of which is connected to the output of the block 3 фop - l and to the first outputs of the triggers i. 1,. ", The second inputs of which are connected to the inputs of the formation unit 3,

The device for the selection of the pulse of the posi tion: a signal having an extreme frequency, works as follows.

When selecting a sequence having the maximum frequency, the pulse of the input sequence received at the first input of one of the channels 2 ”,, 2, n processing (fi; r, 3 a, b), resets the integrator

4 and sets the trigger 7 of this channel to one state. Negative voltage drops, which form at the same time at the outputs of the comparison blocks and inverse outputs of the triggers 7, do not cause the appearance of a pulse at the outputs of the formers 9 of pulses that form pulses only on the leading edge. Then the voltage on the integrator 4 begins to increase as a result of the arrival at its input of a signal from the source 1 of the reference signal (Fig. 3B, d). At the moment when the voltage at the output of any of the integrators 4 reaches the value memorized in the previous cycle in the corresponding memory block 5, a positive voltage drop is formed at the output of the corresponding comparison unit 6, as a result of which the output of the corresponding shaper 9 pulses

55 a pulse appears, which is fed to the corresponding input of the forming unit 3, causing the formation at its output of an output pulse after 40

45

relations (figure 3 |). The impulse from the output of the formation block 3, arriving at the control inputs of the memory blocks 5 and the inputs of the reset flip-flops 7, leads to memorization of the voltage values in the memory blocks 5 that occurred at the outputs of the integrators 4 at the time of forming the pulse at the output of the block 3 formation, and to reset the triggers 7. The reset of the integrator 4 of the first channel and the installation of the trigger 7 in the unit state occur at times T, T, T ,. T, „. T ,,. T „. T,

J-: c H

7

T.

10 1 -47 2

LJ,, 25 g7 a reset of the integrator of the 4th n-th channel and installation of the trigger of the 7th-th channel in one state - at the moments of time Tj, T,

9

and t

12 19-1B Zo 22 24 Gy

2c, and the formation of pulses of the output sequence, memorizing the values of the voltages at the outputs of the integrators 4 in the memory blocks 5 and resetting the triggers 7 at the instants of time T,

Tf. T

Ti

, t,

24

   sixteen

 , Tjg and Tj, (FIG. 3 a-d).

After the moment of storing the voltages in the memory blocks 5, the first (with sufficient rise time) dreams reaches the memorized value of the voltage that of the integrators, the voltage rise at the output of which continues for a shorter time, i.e. an integrator for which the moment of memorization in the previous cycle fell into the interval between the pulses of the input sequence having a shorter duration. In this case, in block 5 of the memory of this processing channel, the same value is remembered as in the previous cycle, and the time interval between the previous and subsequent moments of memorization, i.e. between two adjacent pulses at the output of the formation unit 3, is equal to the smaller time interval between adjacent pulses at the input of this processing channel. In block 5 of the memory of the other channel, a new value is stored. So, the intervals

Tj 5

- T

t t -

 eight

". T

11 Id -46

   between the pulses of the output sequence are respectively equal to the time intervals T, - T, T - T, Tj - T, o (between the pulses of the first input sequence)

T,

7

- T.

and t

15

- T

18

(between im24

24 26

pulses of the second input sequence of the input sequence) and

), which are less than, respectively, time intervals T - T,

- T

9

T, 42

, t ,, - T,

and T.

T.JI. The time interval T, T, has the same duration as equal periods of time.

to

15

th

20

but

25

thirty

35

40

- T,

and that - t

1-2

INPUT software45

- 10 13 9

sequences.

In the operation of the device, it may happen that by the time of arrival of the next pulse to the input of one of the voltage processing channels on integrators 4 of this and other channels they do not have time to achieve the values memorized in the previous cycle, which corresponds to time 1 (Fig. 3). In this case, the operation of the device is as follows.

At the moment of the pulse of the second input sequence, arriving at the counting input of the trigger of the 7th n channel, which is set to one state by the previous pulse of this sequence at the moment of time, returns the trigger of the 7th nth channel to the initial state. As a result, at the output of the trigger 7 At the moment of the 5th channel, a positive voltage drop appears, which leads to the formation of a pulse at the output of the shaper of the 9th and fifth channel and at the output of the forming unit 3. The time interval T, d - T ,, 2 between the pulses of the output sequence is less than the previous interval T, d - between the pulses of the second input sequence, which at this time has a higher frequency but longer than the next interval T of the same sequence. In reality, i.e. in the case of input pulses from the frequency sensors of the speed of wheel pairs, the difference in the duration of the time interval between the pulses at the output of the frequency sensor speeds can not significantly change over successive periods. B moment

2Z

in integrator 4 is remembered

value close to zero.

After that, the formation of the output pulses occurs in the usual way,

five

those.

t 24

time intervals T

-26

26

- T

ha

and t

22 2S

- t

- t 1

24

between output pulses are equal, respectively, to time intervals T, - (between pulses

24 26

swarm input sequence) and

T.J.J - 1, - (between the pulses of the first input sequence), which are less than the intervals T -,, 24

- T

26

And Tgb - Tg9.

In case of separation of a sequence with a minimum pulse frequency (Fig. 4a-4 (j), t, e, in the case of block 3, as shown in Fig. 2), the formation of a pulse at the output of the element 10 of the formation block 3 fig. A) occurs only when all the flip-flops 11. 1,. , 1 1 .п return to the initial state. Thus, the pulse of the output sequence is formed in this case at the moment of the block response, 6 comparing that of the channels in which the voltage of the integrator 4 (Fig. 4 & g) later reaches the stored value and the time interval. fig.4c1 &) in which the moment of memorization in the previous cycle, i.e., the period after the frequency having the minimum frequency, falls.

So. intervals T - T,

, 10 5 T) e T between output pulses is equal

according to time intervals

t; - t ;, t; - t, t - t; (between

impulses of the first input sequence) and T ,, - t | , t, - t;

(between the pulses of the second input sequence), which are longer than, respectively, the time intervals

nor t - t ;, t; - td, Tg - t ;,, t; -

- (figure 4 q-g).

t t

15 |

- T

18

In the event that the arrival time of the next pulse to the input of one of the channels does not have time to reach the memorized value on the integrator of this channel, the formation of the pulse at the output of this channel occurs as a result of the return of the trigger 7 of this channel to the initial state. Thus, the trigger of the 7th p-th channel is set to a single state at time T, and the return is s 0 5

five

five

0

five

shipped to its original state at time T, providing a pulse from the output of channel 2, n to the input of formation unit 3. Since the second sequence has a lower frequency at this time, the time interval T ,,, - T, between the output pulses is less than the interval τ, - Tjp, but more than the interval - Tl. second, in real terms, the difference between these intervals is not significant,

At time T, in memory block 5, a value close to zero is memorized, after which the operation of the device occurs in the usual way.

When using three or more channels, the operation of the device does not change.

Claims (2)

1. A device for extracting a pulse sequence having an extreme frequency, containing a shaping unit and n processing channels, the first INPUTS of which are connected to the input busses of the device, and above the processing channels are connected to the inputs of the shaping unit, the output of which is connected to the output busbar Each processing channel contains an integrator, the first input of which is connected to the input channel of the processing channel, which is connected with ji so that, with the aim of increasing 1 speed, the source of the reference the signal, the output of which is connected to the second inputs of the processing channels, the third inputs of which are connected to the output of the shaping unit, with a memory block, a comparison block, a trigger, an NL element and a pulse shaper, whose output is connected to the output of the processing channel, the second input of which is connected to the second input of the integrator, the first input of which is connected to the first input of the trigger, the output of which is connected to the first input of the OR element, the output of which is connected to the input of the pulse former, and the second th input of the RSHI element is connected to the output of the comparison unit, the first input of which is connected to the output of the integrator and to the first input the memory unit, the second input of which is connected to the second input of the trigger and to the third input of the processing channel, and the output of the memory unit is connected to the second input of the comparison unit, 2. The device according to claim 1, 1 and 2, is that the shaping unit is made either on the OR multiple element, whose input is:  s% - bb 13 Gg2 / 2, Tgv Tgv 7, Fi & 5 J8P MS 7J g / V 75 G5 TZ T7 LO Sh Ш G / 5 Т / 9 ГЛЗ Т25  FIG. H VShPI Order 2781/56 Circulation 816 Random polygons pr-tie, Uzhgorod, st. Project, 4 are the inputs of the block, and the output is the output of the block, or on n triggers, the outputs of which are connected to the inputs of the AND element, the output of which is the output of the forming unit, and the first inputs of n. The flip-flops are the inputs of the formavag block, the second inputs of the flip-flops are connected to the output of element I. Subscription