SU924668A1 - Regulating system - Google Patents

Description

(5A) REGULATION SYSTEM

one

The invention relates to systems for controlling the output parameter of an object by varying the flow rate of solid, liquid or gaseous material flows, especially when managing objects with a variable gain and transport delay, in particular for controlling the alkalinity of the pulp in a grinding cycle during the enrichment of non-ferrous metal ores.

A known control system comprising a serially connected control unit, a reference element, a controller, a first switch, a first actuator, a first regulator, a position sensor of the first regulator and a second switch, a second output of the first switch through a serially connected second actuator, a second regulator. The organ and the position sensor of the second regulator are connected to the second input of the second switch, the outputs of the first and second regulators are connected enes with the first and second control inputs of the object through the sensor output of which is connected to the control parameter input of a second comparing element t11 «

A disadvantage of the known device is the relatively low dynamic accuracy of the system.

The purpose of the invention is to increase the dynamic accuracy of the regulation of objects. variable gain and transport lag.

This goal is achieved by the fact that the control system additionally has a delay unit, the input of which is connected to the output of the second switch and the output to the input of the first switch.

FIG. 1 shows a block diagram of the system; in fig. 2 - timing diagrams The system contains an adjustment object 1, to the output of which the sensor 2 of the adjustable parameter is connected, connected together with the setting device to the reference element C, the output of which is connected to the controller 5. The output of the controller 5 is connected to the first switch 6 o To the first and to the second output of the first switch 6 are connected actuators of small and large regulating actions, consisting respectively of actuators 7 and 8, kinematically connected with regulating bodies 9 and 10 of small and large shogo quantity of flow regulating variables streams are measured respectively by sensors 11 and 12 positions of the first and second regulators are connected to the input of the second kommutato--. pa 13, the output of which through the block H time delay is connected to the primary switch 6f. The system works as follows when changing the gain factor. It is not necessary for the object to obtain a qualitative adjustment process to change the gain in the control loop so that the gain of the closed-loop system varies within the allowable range, in particular, this can be achieved by discretely changing the gain in the actuator, for example, by connecting through the first switch 6 to the output of the regulator 5 of the actuators 7 and 8, kinematically linked to the regulating bodies 9 and 10 of small and large flows. The controller 5 converts the signal at the output of the comparison element k, equal to the difference between the signal of the sensor 2 at the output of the object and the setting device 3, into a control signal. With a small change in the gain of the object during the transition process in the system, the average value of the regulating effect characterizes the gain of the object, the shape of which static characteristic does not change when its parameters change. The magnitude of the control action at which the gain factor in the actuator needs to be changed depends on the range of variation of the object gain factor.

Claims (1)

SOW match. At t 5, there are no pulses at the output of the delay unit. During the time interval, tes and switching of the regulator with the executive body that implements the regulating action with the coefficient k by means of the regulator of the large flow takes place. the form of its static characteristic, a given value of the adjustable parameter. It is set in the second switch 13 whose output signal changes depending on this value and the output signals of the sensors 11 and 1.2 of the position of the first and second regulators. The first switch 6 is switched through a time proportional to the transport and inertial lag in the system, which is realized by switching on between the second switch 13 and the switch 6 of the time delay unit. The change in the coefficient 1 of the impact occurs when the magnitude of the control action U passes through a certain threshold value Up. When the control action U exceeds the threshold value Un, the action coefficient k is greater than the impact coefficient kj corresponding to the control action value and below the threshold value U The second switch 13 converts the control signal U into a successor of rectangular pulses, Ya whose duration corresponds to the time during which control its impact IJ exceeds the threshold value of Ol Sfig "2). These pulses control the time delay block I in such a way that rectangular pulses, YiS, are generated at the output of the And time delay block, duration (yr% z Zb i) (-214 4 of i where and 63 are the input pulse duration and at the output of the block; 3 is the delay time of the AND block of the time delay.With L, the beginning of the pulses at the output of block 14 is shifted by Сз relative to the pulses Ufa of the output of the second switch 13. The rising edges of the pulse5 .9 coeff gain and lag - with discrete changes in the gain in the control loop. Formula of the Invention A control system comprising a serially connected setpoint, a reference element, a control, the first switch, the first actuator, the first control, the position sensor of the first control and the second switch, the second output of the first switch is through the after-wise connected second executive mechanism, the second regulating organ and the sensor of the position of the second regulator The connecting element is connected to the second input of the second switch, the outputs of the first and second regulating bodies are connected respectively to the first and second inputs of the control object, the output of which is connected to the second input of the comparison element through the sensor of the adjustable parameter, which in order to increase the dynamic accuracy of the system It contains a delay unit, the input of which is connected to the output of the second switch, and the output to the input of the first switch. Sources of information taken into account in the examination 1 "USSR author's certificate. „,. . „,.„ .., „,.„ „192883, foi. G 05 D 11/08, 19b7 (prototype), and, % FIG. 2