SU1341653A1 - Parameters checking device - Google Patents

Abstract

The invention relates to computing and can be used in control systems and control of technological parameters. The purpose of the invention is to increase the reliability of control results. The device for controlling parameters contains a comparison block 10, a pulse generator 4, counters 5, 7 and 9, a digital-to-analog converter 8, a decoder 6, channels 12, each of which contains sensor 1, a normalizer 2, a comparison block 3, registers 11, 13 and 14 with three states, four elements And 15, 16, 19 and 20, two counters 21 to 22 to four triggers 17, 18, 23 and 24. The device allows for stochastic control of the object with regard to failures by estimating the time of exit of parameters beyond tolerances. 1 il. (L with 4 F JV CO

Description

The invention relates to automation and computing and can be used to automatically control and digitally measure the parameters of a process unit.

The purpose of the invention is to increase the reliability of control results.

The drawing shows a diagram of the proposed device.

The device contains sensors 1, normalizers 2, analogue comparison unit 3, pulse generator 4, second counter 5, decoder 6, first counter 7, digital-to-analog converter 8, third counter 9, digital comparison unit 10, first register 11, channels 12, the second and third registers 13 and 14, the first and second elements And 15 and 16, the first and second triggers 17 and 18, the third and fourth elements And 19-20, the fourth and fifth counters 21 and 22, the third and fourth triggers 23 and 24 , control unit .25.

The device works as follows.

Before starting the monitoring process, the triggers 17, 18, 23 and 24 and the counters 5, 7, 9, 21 and 22 are set to the zero state, and the counters 9, 21 and 22 are set with the help of the control and registration unit 25, the necessary conversion factors. These coefficients are calculated based on the stochastic parameters and the implemented control principle, which is as follows. A monitoring period T is selected, over which the behavior of the monitored parameters is observed. For a given period T, based on the specified control accuracy, for each parameter, the maximum allowable time for it to reach the upper Tg g and the lower T limit of tolerances. During the period of control TC countercurrent

the controlled quantity may in time Tg exceed the upper tolerance graph or during the time T t beyond the lower tolerance limit. If Tj in dn, an emergency situation is recorded, otherwise

In this case, the parameter is considered to be within tolerances. The monitoring period T is determined by the counting factor, and the value

 with

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coefficient is calculated by the formula

TO

t / smtt7-

de tj. - the period of the pulse generator 4;

counter conversion factor 5;

counter conversion factor 7. Counter conversion factor 21

K. K, is determined by the formula

ON

And counting

To

Tn,

T .: to; to.

 g m 2

The conversion factor of counter 22 determines the time T, and is calculated using the formula

TV.A

6-A

TO

Also, by means of the control and registration unit 25, the values of the lower tolerance limits are entered into the register 13, and the values of the upper tolerance limits for each parameter are entered into the register 14.

After starting the device, the pulses from the generator 4 output go to the counting input of the counter 5, which controls the operation of the decoder 6 and whose recalculation coefficient is 2N, where N is the number of monitored parameters. The signal from the pulse output of the counter 5 is fed to the counting input of the counter 7, whose information output controls the digital-to-analog converter 8, and simultaneously arrives at the first input of the comparison unit 10. Thus, each state of counter 7 has one cycle of operation of counter 5 and, accordingly, decoder 6. When a signal appears at one of the outputs of decoder 6, the corresponding register 13 or 14 is brought out of high impedance and connected to the common bus which combined their information outputs. Thus, the information recorded in this register goes to the second input of the comparison unit 10, the output of which when the counter status code coincides with the state of the upper or lower register connected to the common bus 13 or 14

3

the lower tolerance a signal arrives at the corresponding inputs of elements 15 and 16. At the same time, the same signal from the decoder 6 allows the signal from the output of the comparison unit 10 to pass through the corresponding element 15 and 16, and element 15 opens simultaneously with the connection to the common bus of the corresponding register 13 (lower tolerance), and item 16 - the corresponding register 14 (upper tolerance). Thus, when the status code of the counter 7 coincides with the contents of one of the registers 13 or 14, the corresponding trigger 17 or 18 is set by the coincidence signal to one state. These triggers are reset by a signal from the pulse output of counter 7, since using a counter 7 and a digital-to-analog converter 8 controlled by this counter, a saw-tooth sweep is formed, which determines one cycle of measurement for its duration, the triggers 17 and 18 are reset after each measurement cycle. Thus, the unit state of the inverse output of the trigger 17 is a sign that the sweep voltage at the output of the digital-to-analog converter 8 is in the zone lying below the lower tolerance limit, and the unit state of the output of the trigger 18 is in the zone above the upper border tolerance. The signal from sensor 1 of the monitored parameter, passing through the normalizer 2, is fed to the input of comparison unit 3, the second input of which receives a sweep from the digital-to-analog converter 8. In comparison unit 3, these two signals are compared in analog form, and if they coincide on the ground, the pulse that goes to the inputs of the corresponding elements of And 19 and 20 and to the input of the record of register 11. This pulse rewrites the status code of the counter 7 into the register 11, i.e., in the register 11 the current value of the control is always stored my magnitude which can at any time call via the control unit 25 and registration. Since AND 19 is opened by a signal from the inverse of the trigger code 17, through it the impulse of coincidence from the output of the corresponding

iQ ig 20 25 zos 40 45 50 55

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The comparison unit 3 is fed to the counting input of the counter 21 only when the value of the monitored parameter is below the lower tolerance limit. Similarly, this counter coincidence through the AND element 20 arrives at the counting input of the counter 22 only when the value of the parameter being monitored is Bbmie the upper tolerance limit. Thus, the counter 21 counts the number of measurement cycles in which the value of the monitored parameter is greater than the upper tolerance limit. The counters 21 and 22 are reset by a signal from the pulse output of the counter 9, which counts the number of measurement cycles by signals from the pulse output of the counter 7. Thus, the overflow of the counter 21 is a sign that during one monitoring period T | j of the monitored parameter beyond the lower tolerance limit T „exceeded the estimated allowable time T and e. This overflow is detected by setting 1 trigger 23 with a signal from the pulse output of the counter 21. Overflow of the counter 22 means that the monitoring period T is the time that the monitored parameter limits the upper tolerance Tg to be greater than the estimated tolerance time Tj, which is fixed by installing a triggered 24 to 1 signal from the pulse output of counter 22,

The proposed device has a higher confidence of control, since the control principle embodied in it takes into account the stochastic nature of the behavior: the monitored parameter and random measurement errors. The introduction of registers for storing tolerance values and organizing centralized operation of the device by means of a control and recording unit, which can be used as a controlling computer, expands the functionality of the proposed device, since the values of tolerances can be changed by the control and registration unit according to a given program. Also, depending on the varying stochastic properties of the monitored parameters, the values of the monitoring period and the permissible time of the parameter out of tolerance can be easily changed, which expands the scope of application of this device.

Claims (1)

Invention Formula A device for controlling parameters, comprising a digital comparison unit, a first counter, a digital-to-analog converter, a pulse generator and channels, each of which contains an analog comparison unit and a serially connected sensor and a normalizer, the output of which is connected to the first input of the analog comparison unit of a given channel, the data outputs of the first counter are connected to the first group of inputs of the digital comparison unit and to the inputs of a digital-analog converter increase the reliability of the control result, the second and third counters, the decoder are entered into the device, and each channel contains from first to third registers, the fourth and fifth counters, from first to the fourth And elements and the first through fourth triggers, the outputs of the first reg. tra and the third and fourth triggers of both channels are the corresponding outputs of the device, the setup inputs of the second and third counters, the second register and the third registers of both channels, and the fourth and fifth counters and the inputs to the O of the third and fourth triggers of both channels are the corresponding inputs of the device, the outputs of the decoder are connected in each channel respectively to the control input of the second register and ne to the left input of the first element AND to the control input, the third Compiler I.Alekseev Editor M.Dishsh Tehred M.Didyk Proofreader L. Order 4438/53 Edition 672 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. „d, 4/5 Production and printing company, Uzhgorod, “Projectna St., 4 0 five five register and to the first input of the second element And, the data outputs of the second counter are connected to the inputs of the decoder overflow output — to the counter input of the first counter, the overflow of which is connected to the reset inputs of the first and second triggers of each channel and to the counting input of the third counter ; the output of which is connected to the reset inputs of the fourth and fifth counters of each channel, the data outputs of the first counter are connected to the data inputs of the first registers of both channels, the output of the digital-to-analog converter is connected in each channel to the second inputs of the analog comparison / output unit connected to the gates - the input of the first register and with the first inputs of the third and fourth elements And both channels, the output of the digital comparison unit is connected to the second inputs of the first and second elements And both channels Alov, and in each channel the outputs of the first and second elements I are connected to the installation inputs of the first and second triggers, respectively, the inverting outputs of which are connected to the first 1 W inputs of the third and fourth elements, respectively. And, the outputs of which are connected to the counting inputs of the fourth and fifth counters, respectively, the overflow outputs of which are connected to the installation inputs of the third and fourth triggers, respectively, the outputs of the second and third registers of both channels. Connected to the second group of outputs of the digital comparison unit, and the output pulse generator connected to the counting input of the second counter. thirty 40