SU370889A1 - Station ratios - Google Patents

Description

(54) SYSTEM FOR

The invention relates to devices for the automatic regulation of several parameters, the values of which must be kept at a given ratio in any MO: MVT of time.

A: A known system for regulating parameter ratios for technological processes, comprising a software device and comparison units. When implementing the laws of regulation, either AND, or PI, or PID will have a regulating effect on (i) according to these laws, respectively:

Kfxdt

K / dt,

K / xdt Kjx

where X is the mismatch (instantaneous

 rashka);

kKi-Kj, - proportional coefficients; FESTIVES.

In steady-state mode at the end of transient processes, an instantaneous error X O and a regulating effect

according to all three laws it looks like:

at Kf xd-t

It is obvious that for different regulatory actions the value of J Xdt will be different, i.e. the value of the total, missed error, which takes on different values depending on the imputation of the program or other disturbing factor. The latter is a negative property of known control systems. consumption of the original components.

In the proposed system, the comparison block for each channel is made in the form of a digital Pp reversing integral nullorgan, one input of which is connected to the output of a digital ratio controller of a program device, and on the other to the output of a pulsed flow sensor of the executive the converter is connected to the input of the comparator, the second input of which is connected to the adressor, and the output is connected to the input of the REGULATION REGULATION of the TECHNOLOGICAL PROCESS PARAMETERS

iTOpa, and the latter’s code is one with the valve of the device, the other two are the opposite of the null organ through logical OR laughter. having two inputs, are connected to the control circuit, a total error, made in the form of a logical OR circuit with the number of inputs equal to the number of adjustable valves, the output of which is connected to the generator control circuits of the programmer; signaling. This embodiment makes it possible to improve the control accuracy, reliability, operation and simplify the system.

The drawing shows a block diagram of the proposed system used to displace petroleum products, where 1 is a software device; 2 — comparison units; 3 - reg l tori; 4 control circuit for the total error 5 actuator.

The software device is made in the form of a pulse generator 6 of production (Thermality, connected to a digital ratio sensor 7, in which, using a common three-decade interpolator, each required channel is set to the required frequency. A comparison unit is made through a single channel of the j, of a slender integral nud-organ 8, whose input is connected to the sixth aad sensor of the correlation, and the other to the flow sensor 9. The outputs from the anti-pole poles of the zero-organ 8; due to errors, are connected through the OR OR 1O logic circuit, which has two outputs, to the control circuit for the total error. The counting output from the null organ is through the Shch1fro chanallo-pneumatic-tactical. It consists of a pneumatic PR1 or PID controller 12, the input of which is connected to the output of a general optical controller 13. 13. For one vdad of which the output from the preamplifier W is connected. The other is the pneumatic setting device 14 | The output from the controller 1 is connected to the actuator. Control scheme for the total error

made in the form of a logical OR circuit with a number of inputs equal to the number of regulated channels. the output of which is underpinned to the generator control circuit 16 of the producer. in the control circuit 17 of the controllers and the device (on the same as) and to; the control 18 of the light and sound; given by the isation. Actuator

to the channel is made in the form of a pneumatic valve 19, a pulse sensor 9 flow and pump 2G.

The system works in the same way.

After switching on the performance HMriy.ih jHuio pa, with no max; maximum allowed total errors, zyuyvaem ys in null organs 8 of each dsanal, the control circuit 16 gives permission for the arrival of immersions from the generator 6 to the digital adjuster 7 ratios, while raising the frequency from the minimum value to the required value.

From the digital setting device 7 ratios, pulses start to flow to one of the inputs of the zero-organ of each channel of the comparison unit 2, the quantities of which relate to each other in the same way as the specified ratios of the controlled flow rates of the mixed components. At zero error in the null organ 8, the signal at the output of the converter 11 is equal to O, B kg / cm; with a maximum negative error in the null organ - 0.2 kg / s

with a maximum positive error of 1, 0 kg / cm. The signal from the pneumatic sensor / sensor always has a constant value and is equal to 0.6 KiVcM.

Thus, the arrival of pulses from the software device in the nullorgan accumulates a positive error. The signal at the output of the transducers 11 of all channels begins to change from 0.6 kg / cm to a larger side. The resultant mismatch signal S by the comparator 13 according to the PI or the FID law will be applied to the valve 19 as a regulating action. The presence of a closed loop feedback will lead the process of adjusting FISH1 to the steady state, i.e. at the input of the comparao-ora, the initial value will again be: 0.6kg / cm zero error. But since the null-organ 8 is an integral element, then aix) will also be an integral error error.

The law of change of regulatory effect, stBI y has the form (in the presence of PI pneumoAul torus 12):

y-KiJxdt + K JJxdt-dt, in steady state

K, JJ- X dt di; k - O; J-X {. t - about.

-

The system possesses a spois; tvami s11C1khemy with astatism BTOpoi o cent .. 1 for vi allows for the time of transient processes to continuously eliminate two types of information; Integral and integral.

The error control scheme works with blowing the image.;.

When the occurrence of su m "pnii onniGi, :: any1 O ppak in; beat; l of if.iHa: ujp, the play is permissible. ire / lelm such that .i: ia.:.: i.:i;-Kno III) jM.rxi