SU1434401A1 - Variable-structure controller - Google Patents

Abstract

The invention relates to systems for the automatic control of technological parameters, such as pressure, under standby conditions and can be used in the chemical, oil, gas and other industries. The purpose of the invention is to increase the speed and quality of regulation. The regulator contains sensor 1, first 2, second 3 and third 4 setters, first 5 and second 6 algebraic adders, first 7, second 8, third 9 and fourth 10 switching blocks, threshold device 11, proportional link 12, integrating link 13, timer 14, element OR 15, actuator 16. 1 Il. (Oh (L

Description

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The invention relates to systems for the automatic control of process parameters, such as pressure j under conditions of a standby mode, and can be used in the chemical, oil, gas and other industries.

The purpose of the invention is to increase the speed and quality of regulation,

The diagram shows a schematic of the regulator.

The variable structure regulator contains sensor 1, first 2, second 3 and third 4 setters, first 5 and second 6 algebraic adders, first 7, second Sj third 9 and fourth 10 switching blocks, threshold device 11, proportional link 12, integrating element 13, timer 14, element OR 15, actuator 16.

The regulator works as follows.

The signals from the sensor I and the first unit 2 arrive at the input of the first algebraic adder 5, where their algebraic addition occurs;

X - Xf, -,.

The threshold device 11 is adjusted in such a way that its operation occurs at a value greater than, at a given mismatch between X and X n for Chtsun of its mode. Thus, the mismatch, for the standby mode, passed unchanged the second algebraic adder 6 (the first switching unit 7 is in the open state) will go to the first information inputs of the proportional 12 and integrate 13 links, which will lead to the installation of the actuator 16 into one from the extreme positions, depending on the purpose of the controller and the type of actuator (the second switching unit 8 is in position A). If the executive device 16 finds c in the closed state at maxi. The maximum signal level (Y -) at the output of the second block 8 of the conjugation will be the signal Y YMCIHC. When a varying disturbance is applied, the mismatch 8 at the output of the first algebraic adder 5 increases, which will trigger the threshold device 11 and form

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at its output, the command signal Rp, which will go to the first command of the fourth switching unit 10 and the element OR 15.

Thus (when triggered, the threshold device 11 (the presence of the signal Pp) and the absence of an external command signal at the output of the fourth switching unit 10, the signal Y i Xxip is formed at the output of the element OR 15, the signal Y, 1 is generated, which goes to the control input of the first block 7 switching and will connect the signal f, to the second input of the second algebraic adder 6, which will lead to the absence of a mismatch at its output Oh. At the same time, the output signal of the second switching unit 8 will switch from polo B, i.e., the input of the actuator 16 is connected to the output of the fourth block, 10 switching, where X will be sent. Thus, the actuator 16 will move rapidly to a new positon, which will compensate for the incoming disturbance. decreasing the mismatch, will go to the input of the integrated 13 and proportional 12 links, the output signal of the proportional link 12 will go to the input of the actuator 16, and the output signal of the second switching unit 8 will not be to blunt on the second information input of the integrating link 13. In the future, the compensation of the received disturbance will be proportional to 12 and integrating 13 links 1- {Io

When a significant disturbance is received in the channel of the external command signal, a signal P k will be generated. 1 which, through timer 14, goes to the second inputs of the OR element 15 and the fourth switching unit 10

Thus, in the presence of an external command signal P, the output of the switching unit 10 produces a signal YI Xg (if there is a simultaneous input command signal P, e at the input of the switching unit 10 of the signal Pp, and the output of the switching unit 10 produces the signal YI X) " At the same time, at the output of the element OR 15 forms, the signal Y, 1 is sent, which will lead to switching

first 7, second 8 and third 9 switching units, i.e. the same switchings S will occur as at the appearance of the signal Pp 1. The difference is that in this situation the output of the fourth switching unit 10 will be the signal Y X. Unlike X, the signal X corresponds to a greater degree of opening of the actuator 16, ensuring the operation of this disturbance for a certain period of time, is set by timer 14, upon expiration of which P O is formed at the output of timer 14, which causes the switching unit 10 to reset. At the same time, the signal Y, O, and the first 7, second 8 and third 9 switching units go back to the initial state, and the proportional 12 and the integrating 13 links are activated on the extrusion of the OR element 15. When a Pp 1 signal appears at the output of the OR 15 element, a signal Y, is generated; 1, at the output of the switching unit 10, the signal Y Xj. The operation of the device in this case is similar to that described. When simultaneously receiving signals Rp and Rc, the signal Rc has the highest priority.

Claims (1)

Invention Formula A variable structure regulator containing a sensor and a first setter, the output of each of which is connected to the first and second inputs of the first algebraic adder, respectively, the second setter and the actuator, which in order to increase quickly 5 o about five control quality, four switching blocks, a second algebraic adder, a proportional link, an integrating link, a third setter, a threshold device, a timer, whose input is an input of the external disturbance of the regulator, an OR element, and the output of the first adder is connected to the information input of the first switching unit, to the first input of the second algebraic adder, connected by the second input with the output of the first switching unit, and the output with the first information inputs proportional and integrating links, and through the threshold device to the first command input of the fourth switching unit and the first input element OR, whose output is connected to the control inputs of the first, second and third switching units, the timer output is connected to the second input of the OR element and the second command input the fourth switching unit, the first and second information inputs of which are connected respectively to the outputs of the second and third setters, and the output to the first information input of the second block switching, the second information input of which is connected with the output of the proportional link, and the output with the actuator input and with the information input of the third switching unit connected by the output to the second information input of the integrating link, the output of which is connected to the second information input of the proportional link.