DE1955093C3

DE1955093C3 - Circuit for pneumatic PID controllers

Info

Publication number: DE1955093C3
Application number: DE19691955093
Authority: DE
Inventors: Horst Dipl.-Ing. 7000 Stuttgart Bader
Original assignee: JC Eckardt AG
Current assignee: JC Eckardt AG
Filing date: 1969-11-03
Publication date: 1976-04-22

Description

wert lv und einem Rückführsignal A ⁺ gebildet, dasvalue lv and a feedback signal A ⁺ formed, the

eines von zwei Ausgangssignalen des Differenzdruckversiärkers 19 darstellt. Das zweite Ausgangs-Gegenstand des Hauptpatentes 18 01240 ist eine 50 signal A~ des Differenzdruckverstärkers 19 ist an den Schaltung für pneumatische PID-Regler mit Rück- Widerstand 17 angelegt, der zu dem vom Istwert χ kopplung, bestehend aus mindestens einem Verslär- angesteuerten Druckteiler gehört. Die Ausgangsker, der ein vom Sollwert und vom Istwert und von signale A⁺ und A~ ändern sich mit einer Istwertim Rückkopplungszweig angeordneten Zeitglicdern änderung gegensinnig zueinander. Steigt der Istwert*, abhängiges Ausgangssignal erzeugt, das zur Bildung 55 so steigt auch der vom Istwert-Druckteiler 15, 17 beeines Mitkopplungs- und eines Gcgenkopplungs- aufschlage Eingangsdruck E⁺ und gleichsinnig dasignals dient, wobei mit Hilfe von Druekteilern aus .mit auch das Ausgangssignal A⁺. Das Ausgangs-Istwerl und Mitkopplungssignal ein der Summe ent- signal Λ" dagegen fällt im gleichen Maß ab, wie A ⁺ sprechender Druck und aus Sollwert und Gegenkopp- ansteigt. Umgekehrt ändert sich A~ gleichsinnig mit lungssignal ein der Summe entsprechender Druck 60 dem vom Sollwcrt-Druckteilcr 16, 18 beeinflußten gebildet werden, die als Eingangssignale des als Eingangssignal E~. represents one of two output signals of the differential pressure amplifier 19. The second output object of the main patent 18 01240 is a 50 signal A ~ of the differential pressure amplifier 19 is applied to the circuit for pneumatic PID controller with feedback resistor 17, which is coupled to the actual value χ , consisting of at least one Verslär- controlled pressure divider heard. The output cores, the one of the setpoint value and the actual value and signals A ⁺ and A ~ change in opposite directions with an actual value in the feedback branch. If the actual value * increases, the dependent output signal is generated which, for formation 55, also increases the positive feedback input pressure E ⁺ and the input pressure E + from the actual value pressure divider 15, 17 and the signal in the same direction Output signal A ⁺ . The starting Istwerl and feedforward a sum corresponds signal Λ ", however, falls to the same extent on how A ⁺ Voice pressure and rises from setpoint and Gegenkopp-. Conversely A ~ lung signal a to the sum of changes in the same direction with appropriate pressure 60 to the Setpoint pressure divider 16, 18 influenced are formed, which are used as input signals of the as input signal E ~.

Differenzdruckverstärker ausgebildeten Verstärkers In der Fig. 1 wird demnach zwischen den Widerdienen, ständen 16 und 18, wie vorher erwähnt, die Summe Durch Reglerschaltimgen dieser Art können e.us dem Sollwert w und dem Ausgangssignal A ⁺ und mechanische Vergleichsglieder und Düsenprallplat- 65 zwischen den Widerständen 15 und 17 die Summe tensysteme, wie sie bei üblichen Bauformcn notwen- aus dem Istwert χ und dem Ausgangssignal A~ gedig sind, entfallen. Der vorliegenden Erfindung liegt bildet. Diese \usgestaltung bringt unter anderem nun die Aufgabe zugrunde, die Schaltung gemäß dem c'.en Vorteil, daß insbesondere bei NachschaltungDifferential pressure amplifier formed amplifier in the Fig. 1 is therefore, stands between the counter-dienes 16 and 18, as mentioned previously, the cumulative Reglerschaltimgen this type e.us can w to the desired value and the output signal A ⁺ and mechanical comparators and Düsenprallplat- 65 between the Resistors 15 and 17, the sum of the systems, as they are necessary in conventional designs from the actual value χ and the output signal A ~ , are omitted. The present invention lies in forming. Among other things, this configuration now has the task of improving the circuit according to the advantage that, in particular, when connecting downstream

eines zweiten Diflerenzdruckverstärkers eine wesentliche Steigerung der Verstärkung im Vorwärtszweig des Reglers erreicht werden kann, da die Differenz der Ausgmgssignale A ' und ,-1~, von denen eines mit steigendem Istwert χ steigt, das andere daiiesien fällt, sich theoretisch etwa verdoppelt.With a second diflerential pressure booster, a significant increase in the gain in the forward branch of the controller can be achieved, since the difference between the output signals A ' and, -1 ~, of which one increases with increasing actual value χ and the other decreases, theoretically doubles.

Wird gemäß F i g. 2 das sich gegensinnig mk dem Eingangssignal Ε^Ύ ändernde Ausgangssignal .-i~ über ein Verzögerungsglied 21 an den lstwertdrucktciler-W'iderstand 17, oder das Ausgangssignal A " (wie gestrichelt angedeutet) über ein Verzögerungsglied 20 an d.'ii Sollwertdruckieiler-Widerstand i8 angelegt. entibt sich jeweils ein PD-Regler.If according to FIG. 2, in the opposite direction to the input signal ^Ε Ύ mk changing output signal.-I ~ via a delay element 21 to the lstwertdrucktciler-W'iderstand 17, or the output signal A "(as indicated in dotted lines) via a delay element 20 at d.'ii Sollwertdruckieiler resistor i8 created. A PD controller is created in each case.

Lieut gemäß F i g. 3 das Ausgangssigna! A ~ einmal am Istweridruckteiler-Widerstand 17 und über das Verzögerungsglied 20 am SolKvertdiuckteiier-Widerstand 18 an, so ergibt s^;ch ein PI-Regler. Das gilt auch, wenn das Ausgangssignal A (gestrichelt) über das Verzögerungsglied 21 am Istv.-.-rtdruckteiler-Wider^tand 17 anlieut.Lieut according to FIG. 3 the initial signa! A ~ once at the actual pressure divider resistor 17 and via the delay element 20 at the SolKvertdiuckteiier resistor 18, then s ^; ch a PI controller. This also applies when the output signal A (dashed line) arrives at the actual pressure divider resistor 17 via the delay element 21.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

To expand the main patent to include it in

Patient claims: "^ *** ^R ^ ^rU * other kind ^ ei / cn _2U

be able.

, _ _, ·, R »i,« si '4uf »but according to the invention, Jadurcli« e-1. Circuit for pneumatic PID controllers with, ^ '^ V ^ Serenzdruckve, stronger _m "xwei Aut

Jerk-coupling consisting of at least one 5 losi. ujd uu, ■, ·,.,

Amplifier derein from the desired value and the actual value gangskana en ausgestalte VOBU d ,, Ixden education and of spaced Rückkopplunnszweig gear kanale two verscl ^ g "all ABG _L b, n, before

An output signal dependent on timers is generated, mutually mutually exclusive. "rs» Γ _Γ ■ I
which changes to form a positive feedback signal and an input signal of the D.iTerui / pressure e sta urs,

Gcienkopplungssignals is used where with the help of io and that the output pressure ^ wahheis e au! the

of "pressure dividers from actual value and positive feedback printer act, which is controlled by the actual value

signal a pressure corresponding to the sum and is (actual value pressure divider) or on the printer,

from setpoint and negative feedback signal that is controlled by the setpoint (setpoint pressure

Sum of corresponding pressure can be formed, divisor). _r ...... , _. ,

As input signals of the amplifier, which is designed as differential pressure, the sensitivity of the regulator amplifier can be used, improved according to the arrangement and the hmstellberach of the main patent 18 01240, characterized by variable throttle resistances for the P range, that the differential pressure amplifier setting can be kept smaller
(19) is equipped with two output channels. In addition, the invention makes it possible, whereby the two output channels have two different advantages that a differential pressure amplifier emits signals that are opposite to two output channels change each other when the input signal is used, in that the output of the differential pressure booster changes to form a P controller, and that the input pressure, which is in the same direction as aem from the output pressure (A +, A-), is optionally applied to the input pressure of the pressure divider (15, 17), which changes from the actual amplifier, is activated on the setpoint pressure divider (.Y) (actual value pressure divider), and the output pressure, which is equal to or on the pressure divider (16, 18). the input pressure changes from the setpoint to the value applied by the setpoint pressure divider (HO is controlled (setpoint pressure divider) .th) to the actual value pressure divider

2. A circuit according to claim 1, is thereby applied. If at least one of the two indicates that to form a P-Reeler 30 connections between the output ^{pressures and the output pressure (/ I +} ), which is in the same direction as the pressure lines, a timing element is arranged To get PD or a PI controller, input pressure (E +) changes to the setpoint pressure In the drawing, the invention is connected to hand of divider resistor (18) and the circuit diagrams of controller arrangements are shown. It is the outlet pressure (A ~), which shows itself in the same direction as 35

the input from the setpoint pressure vessel. 1 the circuit diagram of a P controller,

output pressure (£ -) changes, at the actual value pressure F i g. 2 the circuit diagram of a PD controller,

divider resistor (17) is applied. F i g. 3 the circuit diagram of a PI controller.

3. A circuit according to claim 1, characterized in Fig. 1, a P controller is shown in which indicates that to form a PD or 40 as well as in the main patent, a differential pressure PI controller at least in one of the two Ver - Stronger 19 is acted upon by input signals, bmdungen between the output pressures (A ⁺ , which are taken from the pressure dividers formed at the resistors 15 and 17 or A-) and the pressure dividers (15, 17 or 16, 18) 16 and 18 , a timer (21) is arranged. The choke resistors 15 and 16 are

45 changeable and adjustable. The sum of the solenoid between the resistors 16 and 18