SU1315934A1 - Pneumatic regulator - Google Patents

Abstract

The invention relates to technical means of automation, namely to pneumatic controllers. The purpose of the invention is to increase the speed. The controller contains a proportional block I, a block 6 forming the switching function, a valve 3, an adder 4 and a switching relay 5. The output of the proportional block 1 is connected via valve 3 to the negative chamber of the adder 4 and to the first input of the switching relay 5, the second input of which is connected with the output of the adder 4, the output with the output channel of the regulator, and the control chamber with the output of the switching function forming unit 6 and the control chamber of the valve. The controller provides transient processes of finite duration in systems with objects whose dynamics are described by an ordinary differential equation. second time 1 il. i.

Description

one

The invention relates to technical means of control, namely pneumatic controllers, and can be used in the automation of production processes.

The purpose of the invention is to increase the speed of automatic control systems.

The drawing shows a schematic diagram of the proposed controller

The controller contains a proportional block I, a setpoint 2, a valve 3, an adder 4, a switching relay 5, and a switching function forming unit 6 consisting of a direct advance link 7, elements 8 and 9 of the comparison, and equivalence logic logic performed on the relay 10 and 11 and element 1 shi 12.

The inputs of the proportional block I are connected to the channels of the adjustable variable Pp and set 1-sh P, j, and the output through valve 3 is connected to the negative chamber of the adder 4 and one of the inputs of the switching relay 5, the other input of which is connected to the output of the adder 4 power amplifier - to the output channel of the regulator Pg ,,. The output Pp of the setter 2 is associated with a single input proportional to the block and the plus chambers of the adder 4. The inputs of the forming unit of the switching function 6 are connected to the intermediate output P of the proportional block 1 and the output of the setpoint 2, and the output P to the control chambers valve 3 and switching relay 5.

The regulator works as follows.

In accordance with the wiring diagram, the output signal of the 1P block and its intermediate output are described by the expressions

PU, PO -

РпР РО - Е, where -Р is an error signal;

K - gain ratio of the proportional unit, the setting parameter. The output P, link 7 of the direct advance, defining the switch line, is proportional to the sum of the instantaneous value of the error signal and its rate of change.

15934

dr

. T-dt--

where T is the lead time, second par. setting meter

With the help of elements 8 and 9, the error sign (P) and the switch line sign (P) are displayed and the signal is generated, and if they coincide, a single signal is formed at the output of block 6

R p;

to

P 1

f 2 I.

Accordingly, the valve 3 is in a conducting state, the lower nozzle of the switching valve 5 is open, and the regulator functions as a normal proportional regulator with a predetermined gain factor

20

Р Р KF

When 1 occurs between logical signals P and P, the output of block 6 goes to the zero state P 0, the valve 3 is closed, the output of the proportional block 1 corresponding to the switching moment is stored in the negative chamber 25 of the adder.

R ;;, р „- KE,

and the output of the regulator receives an additional 30 signal

Р Р Р -t- КЕ.

Snout 14 °

When controlling objects whose dynamics are described by an ordinary first or second order differential equation, the proposed controller provides for compensation of impulsive disturbances for a finite time, in contrast to the known

40 of the controller realizing the asymmetric movement to the equilibrium position.

Due to this, the control systems speed is achieved 45 times.

Claims (1)

Invention Formula 50 A pneumatic regulator containing a proportional unit, the inputs of which are connected to the parameter and task channels, and the Normalization function switchable, is output connected to the control chamber of the valve, characterized in that, in order to improve the speed, a setting unit is installed in it, adder and trans3 13159344 the switching relay, the output of the proportional unit and the setting device, and the output from the secondary unit is connected via a yut-ing input of the switching relay, which is connected to the first input of the switching chamber of which is connected to the relay and the negative camera of the adder, to the output of the unit Formations of the functional cameras of which are connected by c5 4 switchings, and the output to the output by a single input is proportional to the regulator channel.