SU1196805A1 - Multichannel automatic regulator-type control system - Google Patents

Description

The invention relates to automatic control and can be used to regulate technological processes with several adjustable parameters. five

The purpose of the invention is to simplify the multi-channel regulatory system and increase its reliability.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 is a schematic diagram of the max derivative derivative; in fig. 3 key block diagram.

The system contains elements 1 comparison, objects 2 regulation, selector 3 maximum signal, limiters 4, selector 5 maximum derivative, regulating unit 6, keys 7, actuators 8, regulators 9, 20

10 voltage limited sources.

The selector 5 of the maximum derivative contains the differentiators 11 and 12 of the first and second semi-channels 25 of the first channel (in other channels the node circuits are similar), threshold devices 13 and 14 of the first and second semi-channels, diodes 16-20, load resistor 21 (common for all channels). thirty

When key 7 is executed according to FIG. 3 signals to '^ and K''from selector 5 and V. / And and "c- separator 3 are fed to the first inputs of logic elements And 22. The output signal 23 of the regulating unit 6 is output to the second inputs of these 35 elements. Output signals of the AND elements 22 are fed to the inputs of the OR elements 24 and 25. The output of the OR 24 element produces a 40 logical signal. *), ("0" or "1"), and the output signal of the OR 25 element is connected to the input of the level converter .26, the output of which a signal is formed (H, ⁼ 0 equivalent to 45

tape - 1).

The scheme works as follows.

Mismatch signals ΔΧ, which are formed in the comparison elements 1 as a result of algebraic summation of the output signals of the control objects 2 with the reference signals

, arrive at the inputs of the selector 3 of the maximum signal and simultaneously through the limiters 4 to the outputs of the extractor. 5 maximum derivative. Limiters 4 transmit to their output only those signals that

exceed in absolute value some set threshold limits kX _OPP. The selector 5 generates and pairs of command signals ( _k ; and Κι ", k ' _r and k;, K' ₄ and K *). G These signals can take the values" 0 "or" 1 ". The index ι of the command signal equal to" 1 "means a channel number in which the derivative is maximum. For example, if K ' _r is 1, then the maximum derivative will be in the second channel and its sign will be positive. All other command signals will be equal to" 0 ".

If Κ _λ = 1, and the other command 'signals are equal to "0", then the maximum derivative will be in the third channel, and its sign will be negative.

With a larger number of channels, the reasoning is similar.

The first output of the selector 3 is allocated the maximum modulation that goes to the input of the regulating unit 6,

On the remaining outputs, N pairs of indicative (command) signals and / and and ", and, - and and", ζζ and and '' are produced.

These signals are similar to the command signals of the highlighter 5. The eyes can take the values "1” ·: and ”0”. Index 1 of the triggering signal shows the channel number in which the deviation! The dx signal is maximal, and the number of strokes of a signal equal to 1 determines (conventionally, since the distinguishing signal is unipolar) the sign of the maximum deviation. This allows you to turn on the actuator in the desired direction and, thus, take into account the deviations of the adjustable parameter at the input of the selector 3

The output signal of the regulating unit 6 through the keys 7 controls the actuators 8, which, through the regulating bodies 9, act on the control objects 2. Keys 7 are independently controlled by the second and third inputs. They also have three output terminals connected to the three input terminals of the actuators. When a signal is sent from key 7 to one pair of terminals (middle and one extreme), the mechanism rotates in one direction, and when a signal is sent to another pair of terminals in the opposite direction. The second and third inputs of the keys 7 are also two terminals each connected to

3 1196805 ⁴

the corresponding command and indication outputs of the selectors 5 and 3. When activated, the keys 7 pass the output signal of the regulating unit 6 to their output terminals. This happens when there is a signal equal to 1 on the second or third inputs of the key 7.

When operating in the normal mode, when one of the deviations Δ, is maximum, but less than the nd X ogre, selector 3 allocates the maximum deviation module that goes to the input of the regulating unit 6, and from its output to the first inputs of the keys 7. At the same time additional outputs of the selector 3 appears indicating the signal "1". which enters the second input of the corresponding key, the operation of which causes the actuator to turn in the required direction. Activation of the key means the closure of the system on the channel in which the deviation is maximum.

For the remaining channels, the system remains open and does not regulate them.

.When operating in the heavy mode, when some two (or more) deviations dX exceed the permissible limit of limitations Δ-Χορρ (which can happen if two strong external disturbances affect the objects), i.e. approaching a dangerous level, these deviations pass through limiters 4

and get to the inputs of the selector 5. That of these deviations, for which the rate of change is maximum and which therefore can be the first to reach

5 invalid values of Δ, causes the appearance of the selector 5 of the signal "1" at the corresponding command output. If this signal turns out to be in the same channel in which the deviation

10 as much as possible (ΔΜά (κ ₍ .), ^{Then the} system will''t "continue to work, since

operation of the key due to the command signal from the selector 5 at its third input only duplicates

15 closing the circuit of this key 7. If a single command signal is on the third input of the key of another channel, then when this key 7 is triggered, the output signal of the regulating

20 block 6 will move the actuator 9 of this channel, which will prevent further increases in deviation. On the channel with yH _{paK (} . The work of the system will continue.

²⁵

Thus, in the proposed system, a two-stage channel selection is carried out to regulate, first by priority, the maximum

30 signal, then the priority of the maximum derivative. This principle allows us to guarantee the required accuracy of regulation in case of sharp and significant actions on objects of external disturbances.

1196805

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Claims (1)

MULTI-CHANNEL AUTOMATIC · REGULATION SYSTEM containing a PI controller connected by an input to the control output of the maximal signal selector, and output via a series connected in each control channel signal, and an additional pair, the outputs of which are connected to the second inputs of the corresponding keys, which differs from me in that, in order to simplify the system and increase its reliability, It includes η limiters, η voltage sources and a maximum derivative extractor, each input of which is connected via a limiter to the corresponding input of the maximum signal extractor, and each first output is connected to the third input of the corresponding key, each voltage source is connected to the second input of the corresponding limiter. t gzh ,, 511 ,,, 1196805 Phil! > 1196805 2