SU1300420A1 - Multichannel device for automatic monitoring of parameters - Google Patents

Abstract

The invention relates to automation and instrumentation technology and can be used in systems for monitoring and controlling complex technological processes, for example, in the oil refining and petrochemical industries. The aim of the invention is to increase the reliability of the result of the control parameters. The multichannel device for automatic control of parameters contains 1,2,3 reference parameters sensors, a confidence block 4, sensors 7, 8 monitored parameters, rating blocks 5, 6, switch blocks 9, 10, comparisons 11, 12, summing blocks 17, 18, blocks of memory 19, 20, blocks of multiplication 2I, 22, blocks 13, 14 of the comparison of the magnitude of the error, blocks 23, 24 of setting the permissible magnitude of the error, switching blocks 15, 16. This device allows for the analysis of the magnitude of the error between the signals from the reference and controls controlled parameters. When the mismatch value is less than the specified value, the dependency is corrected between, waiting for the reference and controlled parameters, and with the mismatch value greater than the specified value, which indicates the sensor malfunction of the monitored parameters, the signal is switched. In this way, reliable information is provided on the state of the technological process, t Il. i SL

Description

The invention relates to automation and instrumentation engineering and can be used in systems for monitoring and controlling complex technological processes, for example, in the refining and petrochemical industry.

The purpose of the invention is to increase the reliability of the results of monitoring parameters by adjusting the relationship between the controlled and reference parameters.

Analysis of the known technical solutions has shown that a new set of features of the proposed device, providing for increasing the reliability of monitoring the process parameters and the operability of the system for automatic control of the object, even if the sensors are faulty, has not been identified in other technical solutions.

The drawing shows a structural diagram of the proposed device.

The device contains sensors 1-3 of reference parameters, confidence block 4, normalization blocks 5 and 6, sensors 7 and 8 of monitored parameters, switching blocks 9 and 10, the first inputs of which are connected to sensors 7 and 8 of monitored parameters, comparison blocks 11 and 12, mismatch comparison units 13 and 14, switching units 15 and 16, summing blocks 17 and 18, memory blocks 19 and 20, multiplication blocks 21 and 22, and blocks 23 and 24 defining the permissible mismatch value.

The device works as follows.

The signals from the sensors 1-3 of the reference parameters, checked for reliability in block 4, arrive at blocks 5 and 6 of the normalization. Multiplied by

The constant coefficients in these 45 comparison blocks produce signals to the signals that arrive at the blocking switching blocks of blocks 9 and 10 of the switch 17 and 12

18 and the inputs of blocks 11 and comparison, the second inputs of which receive signals from sensors of monitored parameters, signals from blocks 11 and 12 of comparison, equal to the difference of signals from sensors 7 and 8 of monitored parameters and blocks 5 and 6 of normalization, are fed to the inputs of blocks 13 and 14 comparison of the magnitude of the error, the second inputs of which receive signals from blocks 23 and 24 of setting the permissible magnitude of the error.

censuses that disable the sensors 7 and 8 of the monitored parameters and connect the summing blocks 17 and 18.

50 At the same time, signals from sensors 7 and 8 of monitored parameters are replaced with signals from summing blocks 17 and 18, which are equal to the sum of signals from sensors of reference parameters, resetted by a constant factor, and the error signals stored in memory blocks 19 and 20 and multiplied by the correction factor in multiples 21 and 22.

Denote by X - turnip {and b (parameter; Y is a monitored parameter;, is the calculated value of the parameters of the parameter.

Then

y to y l,

X + K. (Y-X),

where K.

and constant coefficients.

In case the signals from the comparison units 11 and 12 are less than the permissible error value, then the comparison error value units 13 and 14 produce signals for switching on the switching units 15 and 16, which pass the error value to the memory blocks 19 and 20 in which they are stored. and arrive at multiplication blocks 21 and 22, where the error signals are multiplied by a predetermined factor and fed into summing blocks 17 and 18, where they are added to the signals from the normalization blocks 5 and 6. Thus, at the output of the summing units 17, and 18, signals are formed equal to the sum of the signals from the sensors 1-3 of the reference parameters multiplied by a constant factor,

and correction signals proportional to the difference between the signals from the sensors of the monitored parameters and the associated reference parameters associated with them, i.e.

The device constantly makes corrective action on the dependence of the reference and controlled parameters.

If the error signal arriving at blocks 13 and 14 of the comparison of the error value is more than the permissible value of the error signal, which indicates a malfunction of sensors 7 and 8 of monitored parameters, then blocks 13 and

45 14 comparisons produce signals for switching between switching blocks 9 and 10, which turn off sensors 7 and 8 of monitored parameters and connect summing blocks 17 and 18.

50 At the same time, signals from sensors 7 and 8 of monitored parameters are replaced with signals from summing blocks 17 and 18, which are equal to the sum of signals from sensors of reference parameters, resetted by a constant factor, and the error signals stored in memory blocks 19 and 20 and multiplied by the correction factor in multiples 21 and 22.

vnh

Blocks 5i6i21 and 22- device multiplying by a constant coefficient PF 1.9, performing the function P, K (, 2) +0.2.

Blocks 11 and 12 - npHiSop ' algebraic summing PF 1.1.

Blocks 13 and 14 - PR 1.5 positional support.

, Blocks 23 and 24 is a setpoint control unit of the P23 type.

Blocks 15 and 16 include the P-1108 relay together with the input signal delay chain consisting of the PoE.ZO capacitance and P2D.4 resistor.

Blocks 19 and 20 are pneumatic type P2P.1 pneumatic receivers with a pneumatic tank or a block of tanks like PSE.50 on the input line.

Blocks 17 and 18 are the algebraic summing device PF1.1.

Blocks 9 and 10 - pneumatic switching relay PP 2.5,

Unit 4 compares the values of the reference parameters with the boundary values and signals to the service personnel about the possibility of using the device. It can be made on the basis of electrocontact manometers EKM-1,

Analysis of the magnitude of the error and the introduction of a correction signal allow you to continuously calculate and adjust the quality indicators of the resulting product, even if individual devices fail, thus ensuring the operability of the automatic control system of the technological object and increasing the yield of the target product.

rmula

and

four

3 o

bratis

five

0

A multichannel device for automatic control of parameters, containing sensors of reference parameters, the outputs of which are connected to the corresponding inputs of the confidence block whose output is connected to the input of the corresponding normalization unit, switching unit, the first inputs of which are connected to the sensors of monitored parameters, the comparison unit characterized by that, in order to increase the reliability of the results of monitoring parameters, a block for setting the permissible mismatch value is entered into each channel, the block cf mismatch and sequentially connected switching unit, memory unit, multiplication unit and summing unit, the second input of which is connected to the output of the normalization unit, and the first input of the comparison unit connected by the second input to the output of the monitored parameter sensor, and output to the second input the switching unit, the third input of which is connected to the first output of the comparison block of the mismatch variable, the first input of which is connected to the output of the block specifying the permissible difference mismatch, the second input to the output of the block and to

5 to the first input of the switching unit, the second input of which is connected to the second output of the block, comparing the magnitude of the error.

five

Compiled by I. Shvets Editor A. Revin Tehred N.Glushchenko, Proofreader. Cherni

Order 1147/45 Circulation 864. Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Claim A multichannel device for automatic control of parameters, containing reference parameters sensors, the outputs of which are connected to the corresponding inputs of a validity unit, the output of which is connected to the input of the corresponding normalization unit, a switching unit, the first inputs of which are connected to sensors of controlled parameters, a comparison unit *, characterized in that, in order to increase the reliability of the results of parameter monitoring, a unit for setting the permissible mismatch value, a comp mismatch values and series-connected switching unit, memory unit, multiplication unit and summing unit, the second input of which is connected to the output of the normalization unit, and to the first input of the comparison unit connected by the second input to the output of the sensor of the controlled parameter, and the output to the second input of the unit switching, the third input of which is connected to the first output of the unit for comparing the values of the mismatch, the first input of which is connected to the output of the unit for setting the permissible value of the matching, the block for the input of the second a first comparison output tation, coupled ka. shuffle. the second input is for comparison and to the comm unit, the input of which is the second output of the magnitude raseo1300420