SU1241191A1 - Extremum control system - Google Patents

Abstract

The invention relates to the field of automatic control, in particular to search extreme control devices for non-linear di-. namicheskimi. objects. The purpose of the invention is to simplify the system and increase its speed. The goal is achieved by replacing a complex averaging filter into the control circuit of a relaxation generator with an input; dits adder. The principle of operation of the system is that the signals from the generator are not transformed into a sequence of triangular, and then into a sequence of rectangular pulses with subsequent averaging. This improves performance. The system has two circuits: the control loop — the object and the control loop of the frequency of the relaxation generator, consisting of an adder, a sign determinant, a trigger, and an integrator. 3 il. c & (L

Description

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The invention relates to automatic control, in particular, to search devices for controlling non-linear dynamic objects, the dynamic parameters of which are not known in advance or change during operation.

The aim of the invention is to simplify the system and revise its speed. ,

FIG. 1 shows the structural scheme of the proposed system, FIGS. 2 and 3 are structural diagrams of possible implementations of the determinant of the increment sign and the stabilizer amplitude. The system contains relaxation

generator 1, first trigger 2 with counting input, first integrator 3 with variable transmission coefficient, control object 4, differentiator 5, amplitude stabilizer 6, determinant 7 increment sign, second trigger 8 with counting input, second integrator, 9 .. and adder ten.

The determinant 7 of the increment sign (FIG. 2) contains a memory.

roystvo M, element 12 comparison and

Signum Relay 1.Z.

In operation, the increment mark determiner memory 11 stores the input signal, only

when it is increased, it does not react to a decrease in the input signal. The signal from the memory device is continuously fed to the reference element 12, where it is compared to the current value of the input signal. The difference between the memorized and current values is fed to the signal relay 13, and

reaching the dead zone, the latter is triggered, and, by changing its state, at the same time, the drop is memorized in the memory device. roystva - signal. The increment sign determiner 7 determines the sign of the increment of the average rate of change of the input signal from the adder 10, and. switches trigger 8 only in volume with ray, if this speed is lower. .

 Amplitude stabilizer 6 (FIG. 3) contains series-connected

the capacitor 14, the rectifier 15, the low frequency converter 16, the comparison element 17 and the integrator 18. Its task is to keep the amplitude constant at the test influences of the integrator 3 of the main channel when the pitch of the test influences changes. .

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When the stabilizer operates, the capacitor 14 selects a variable component from the output signal of the integrator 3, the rectifier 15 rectifies it, the filter 16 extracts a constant component from the rectified signal, which is proportional to the amplitude of the test actions h ;; at the input of the control object, in element 17, the constant component is compared with the specified amplitude value hjoco, the result of the comparison is integrated by the integrator 18, and the signal from the output of the integrator 18 proportional to the deviations of the amplitude hx from the specified value bzo8 goes to integrator control input 3. In this case, the transmission coefficient of integrator 3 changes, and the amplitude C is kept constant, equal to

The system works as follows.

The main optimization channel searches for the extremum of the output of the object; control, working with some value of the test exposure period, determined by the sum of the signals at the inputs of the generator 1. The generator 1 converts the sum of the signals from the code of the differentiator 5 and the integrator 9 into a sequence of consecutive triangular pulses with durations Chn and fj determined by the ratios K cr - K

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where K is the coefficient of proportionality, and о is the reference voltage of the generator

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Ujc is the sum of the signals from the outputs of the differentiator .5 and the integrator 9.

Trigger 2 converts the signal from the output of generator 1 into a sequence of opposite-polarized rectangular pulses of the same amplitude with durations 1xd and L, respectively.

The integrator 3 together with the stabilizer. the lyser 6 integrates a sequence of bipolar pulses from the output of trigger 2. At the output of integrator 3, a pipiform is formed

signal with a period T equal to T. t + +1, which is fed to the input of the control object. At the same time, the change time of the input signal of the control object in the direction of the level, ω3 — corresponding to the extremum of the output of the control object, exceeds the time of its change in the opposite direction. As a result, the input signal of the control object, on average, during the test exposure period, approaches the level corresponding to the extremum.

An additional optimization channel, depending on the state of the trigger 8, increases or decreases the signal at the output of the integrator 9, which causes a change in the trial period T and, therefore, the successor BUT, the rate of change in the input signal of the object.

The adder 10 determines the average value of the speed -. The increment sign determiner 7 determines the sign of the average speed increment and, depending on this sign, switches the trigger 8 to a state corresponding to an increase in the rate of change of the input signal of the control object. When the trial period reaches the duration corresponding to the maximum speed, the additional channel further maintains it, the duration of the trial period fluctuates around the value found. The movement of the main channel to the extremum of the output of the control object at the same time is performed at maximum speed. After the extremum is found and the rate of change of its average value of the input signal becomes close to zero (theoretically equal to zero | 0), the trigger 8 is switched in a random fashion. But, since the extremum of the output signal of the control object has already been found in the main channel, these random switches do not affect the state of the control object. If deviations of the output signal of the control object from the extremum occur, then the entire search process is repeated.

In this system, the average value of the rate of change of the input signal of the control object is determined by the sum 50 of the matrix 10 by directly summing the input signals of the generator Gen. 1. 1. Unlike the prototype of

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The sum of signals is not transformed into a sequence of triangular, and then into a sequence of rectangular opposite-polarity pulses with a period T and subsequent averaging using an averaging filter. This provides a faster and more accurate change in the average value of the rate of change of the input signal of the control subject, g therefore, higher speed and accuracy of setting the maximum search speed for the extremum of the control output signal, which ultimately improves the system performance compared to the prototype. In addition, the implementation in this system of the adder 10 is much simpler than the implementation in the prototype of the averaging filter, which includes, in addition to the adder, the delay and integration blocks. This cjraiecT- simplifies the system and increases its reliability. . .

Claims (1)

Invention Formula An extreme control system containing a successively connected relaxation generator, a first trigger with a counting input and a first integrator with a variable transmission coefficient, the output of which is connected to the input of the control object, a trimmer connected to the input with the output of the control object, and the output to the first input generator of amplitude, an amplitude stabilizer included between the output and the control input of the first integrator with a variable transmission coefficient, and connected in series will determine Only the increment sign, the second trigger with the counting input, and the second integrator, the output of which is connected to the second input of the relaxation generator, is different from the fact that, in order to simplify the system and increase its speed, an adder is entered into it, the first and second inputs of which are connected with the outputs of the differentiator and the second integrator, respectively, and the output with the input of the determinant of the increment sign. Ot5l.7 Hesji.9 I fug. g Editor M. Bandura Compiled by P. Kudr vtsev - Tehred L. Oleinik Proofreader M. Sharoshi Order 3487/42 Circulation 836 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing, enterprise, Uzhgorod, st. Project, 4