SU1285438A1 - System for controlling gas flow rate - Google Patents

Abstract

The invention relates to the automatic control of gas flow and can be used to control, record and control gas flow rates in a network of enterprise-consumers. The purpose of the invention is to increase the accuracy of gas flow control. The system contains local control points 1.1, a switched telephone network- 2, a central data processing point 3 consisting of an automatic call device 4, an information receiving device 5, an electronic computer 6, an input block 7, an indication block 8, a print block 9. Each local control station 1 contains three sensors 10, three analog-to-digital converters 11, a transmission-reception block 12, an information output block 13, an interface block 14, and a computing device 15.1 Cp. f-ly, 2 ill. l to 00 ate 4 CO 00

Description

The invention relates to the automatic control of gas flow and can be used to control, record and control gas flow rates in a network of enterprises-consumers.

The purpose of the invention is to improve the accuracy of gas flow control.

FIG. 1 is a block diagram of the system; in fig. 2 is a diagram of a computing device.

The system (Lig. 1) contains local points, control, switched telephone network 2, central processing point 3, containing an automatic call device 4, information receiving device 5, electronic computer 6 (computer), input unit 7, display unit B, block 9 print. Each local control point contains lOj-Yuz sensors (pressure, differential pressure and temperature sensors), analog-to-digital converters (ADC) llj-ll, receiving-transmitting unit 12, block 13. Information output, connecting unit 14 and computing device 15.

Computing device 15 comprises a processor 16, an error control block 17, a priority interrupt block 18, a trunk switch 19, a fixed memory block 20, an address selector 21, a program switch block 22 (a scale and exact time setting block), a time setting generator 23, block 24 of RAM.

The device 5 for receiving information is analogous to the microcomputer processor Electronika-60. The error control block 17 is designed to control even / odd data transmitted over the processor bus 5 and the data line of the RAM 24.

The priority interrupt block 18 is standard and is similar to the Electronics-60 block, it provides internal and one external interrupt with the address of the interrupt vector sent to the common bus. The trunk switch 19 commutes four trunks in arbitrary directions, contains internal buffer registers for each trunk, ending with three-state circuits, provides data reception to internal registers from the processor's common bus 16 and a sample of 2 of 3 when transmitting to the block data bus 24 memories.

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In block 22 of the programmable switches, some of them, when you click the Set time button, will determine the set time.

Time setting unit 23 includes a time signal receiver which synchronizes the operation of the time interval generator.

The system works as follows.

The calculation of the average hourly and daily average amount of gas measured by normalized restricting devices with known structural characteristics is based on the average hourly and average daily values of the physicochemical parameters of the gas flow. Since the average hourly and daily average values of P, AP, and T, i.e. pressure, pressure drop and temperature, can be easily obtained from the integral values of the parameters, then using the ADC 11 of the integrating type will allow to obtain the greatest accuracy in determining the average values of these parameters, and hence the gas flow rate as a whole.

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Work in the system in determining the average values of P, LR and T is based on the processing of interrupts coming from the setter 23 temporary inter-. shafts, ASCH1 11, a transmit and receive unit 12 and a program switch block 22, the interrupt levels being arranged in the following order of priority: time setting unit 23, analog-to-digital converters 11, transmitting / receiving unit 12 and program block 22 switches.

The automatic call device 4 may sequentially poll all local points. (control, individual items on the list entered by the operator, or any item separately.

Data 50 received from local points is sent to information receiving device 5, which makes them monitored for the purpose of error protection and output to display device 8. In the computer 6, from the input unit 7, the data characterizing the gas flow are entered: humidity, density, pressure, gas composition and the values of the parameters obtained from local points 1, the gas flow rate is calculated with high accuracy.

At each local point 1, the processor 16 counts the time intervals for the signals of the setpoint 23. If the number of time intervals coincides with the hourly (daily) value, the processor 16 through the address selector 21 reads alternately the readings from the A / D converter 11, the output of which goes through the switch to the processor 16 The latter receives the scaling coefficients from the block 22 of program switches for each measured parameter on the common bus. The processor 16 performs a scaling operation, calculates the average value of each parameter over the past hour (day), and outputs the results of the calculations through the switch 19 to the memory block 24. The data written (read) from memory block 24 when they are input-output via the common bus to the processor 16, as well as when read by the data bus from the A / D converter 11, is monitored by the even / odd error control unit 17.

When an error is detected, the control unit 17 sends a command to the interrupt unit 18, while the processor 16 repeats the calculations. The fragments of the averaging program, executed without outputting information after each fragment is executed, are repeated in processor 16 three times, and the result of each calculation is output to the corresponding buffer register of switch 19 and then after sampling 2 of 2 inside the switch, 19 is written over the data bus to memory block 24.

In this way, the accuracy of the calculation of the average values of the parameters measured at local points is ensured.

Claims (2)

1. Gas flow monitoring system, containing a central data processing center, connected by inputs-outputs via a switched telephone network with N local points, the control, each of which consists of gas flow parameters sensors connected by outputs to information inputs of the corresponding analog-to-digital converters, and from the receiving-baking unit, with the central JHi4-384 The data processing point contains an automatic call device connected by the first inputs-outputs to the input-output of the information receiving device connected by the first output to the first input of the electronic computer, and the second output to the printing unit that differs from In order to increase the fO accuracy of gas flow monitoring, an indication unit and an input unit connected by an output to a second input of an electronic computer are inserted into the central data processing center, the f5 indicator unit is connected to the second output device information reception units, and at each local control point, an interface block, information block, and a computing device connected to the first, second, and third control outputs, respectively, are connected to the control inputs of the first, second, and third analog-digital transforms 5 control ports, to the enabling inputs of analog-digital converters, first, second and third control inputs to the outputs Parity check of the corresponding analog-digital converters, information inputs mi - to the outputs of analog-digital converters, the first information outputs - to the information inputs 5 of the information block, the second information outputs - to the information inputs of the receiving-transmitting unit, the first address output - to the address input of the receiving-transmitting block, the second addressing the output to the address input of the information output unit, the Monitoring and Measurement inputs, respectively, to the first and second control outputs of the receive / transmit unit 5, connected by information inputs-outputs to the first inputs-output and bpoAa interface connected second inputs-outputs to the inputs-outputs of the local control point 0 Nogo. 2. The system of claim 1, wherein the computing device includes a processor, an error control block, a priority interrupt block 5, a trunk switch, a persistent memory block, a program switch block, master of time slots, memory block and address selector, under5I 2 Switched to the first, second and third outputs respectively to the first, second and third control outputs of the device, the fourth output to the control input of the main switch, the fifth output to the input of the program switch block, and the sixth code to the control input of the main memory , the seventh output - to the first address output of the device, the eighth output - to the second address output of the device, and the inputs via the information bus to the first information outputs of the device, to the address inputs-outputs process ora, to the outputs of the software switch unit, to the inputs / outputs of the permanent memory unit, to the first information inputs of the error control block, to the address outputs of the priority interrupt unit and to the control inputs of the main switch connected to the information inputs of the device second in- 48 formation inputs - with. and gf (rm.: 1 cp ent input-output Opok koptrol errors and information inputs-outputs of the RAM, and information outputs with the second information outputs of the device connected to the first, second and third inputs respectively to the first, second and the third control inputs of the error control block associated with the output to the first control input of the priority interrupt block connected by information I / O to the processor, the second control input to the output of the time and the intervals, the third control input - to the input of precise installation unit time, the fourth control input from control input unit, and a fifth control input - to the inputs of manual control Measurement If devices as well and also with a control. mouth out