DE1064740B - Multiple control arrangement with setpoint adjuster that allows the controlled variables to be changed in a non-linear function sequence - Google Patents

Description

The invention relates to emc control arrangement fm / white (or more) intermeshed control loops (multiple locking) with a setpoint adjuster, in particular the scheduler of the rules allowed to change in non-linear function progression

According to the invention, the one regulator / ur adjustment the characteristic of a control valve to the pilot side Characteristic curve of another controlled variable with auxiliary force working measurement range, whose an known range switching as a function of takes place from one of the controlled variables and its preferably linear characteristic curves of different steepnesses are influenced differently by the control variables. A multi-line control function is known to represent several rule functions, but in the present case it is not only important, but the non-linear relationship obtained in this way between two company sizes (Diuck, temperature) should be kept constantly even if the large ones change over time Temperature controller with different control ranges the control function always remains the same With the subject matter of the invention, it is important to achieve various control functions / u by switching Another known temperature controller for space heating is a measured value-controlled Changeover switch is provided that switches the outside temperature to the controller as a disturbance variable, but not a specific one Maintaining the relationship between two controlled variables After all, there is already a regulator for a rigid function control of a single controlled variable known, the measured value via em non-mechanical transmission gear to the actuator of a single Regulator acts against this, you will be the one according to the invention Establishing the functional relationship between two different controlled variables up to now, mechanical control devices have been used to solve this problem The auxiliary control arrangement according to the invention has such devices the advantage that no restrictions are imposed on the shape of the functions to be complied with This is especially true for electrical measurements Wertgeber By appropriate choice of the cons * 5 leave the values of the individual control devices arbitrary relationships between the rule variables and thus achieve control functions with any gradient

If a control device is to be converted from one control function to another, then it is a replacement in the case of mechanical control devices of the transmission element ζ Β of the cam is required Multiple rule arrangement

with setpoint adjuster that sets the controlled variables in mchtlmearem Functional course to be changed

Applicant

Siemens & Halske Society m b. H, Vienna

Representative Dipl Ing C Wallach, patent attorney, Munich 2, Kauhngerstr 8

Claimed priority Austria from November 9, 1954

Dipl -Kfm Alfred Hogn Lmz (Austria), has been named as the inventor

the invention is only an adjustment for this purpose of resistors is required, which is easier and can be carried out with greater accuracy than the Her position of a new cam

Fig. 1 of the drawing shows a diagram of the time-dependent Course of the temperature and the pressure in a cooking process, as it is for example in the paper industry when boiling out the pulp The functional connection is common with acid between the temperature and the time will depend on the consistency of the food to be cooked in advance. The temperature, its course in the diagram is drawn as a thin line is from a Scheduler according to this context leveled

In the present case, the temperature increase due to the heating process takes about 2 hours. During the following 2 hours, the temperature is kept constant at J ₁ (about 70 ° C) weaker extent After about 13 hours, the timer switches off the energy supply and the cooking liquid cools down

The pressure in the kettle is a function of the Adjust the temperature to approximate the corresponding vapor pressure. The pressure control curve is shown in Fig. 1 as a strong line.

909 610/101

Claims (1)

heating the digester, the pressure rises with the temperature up to the value P ₁ (about 4.2 atmospheres), which corresponds approximately to the vapor pressure at temperature t ₁ , and is then kept constant. As the temperature continues to rise, as set by the timer, the pressure must also rise, to an extent that corresponds to the increase in vapor pressure with temperature. Since control devices with a linear cone function are used in the present case, the setpoint of the pressure also increases linearly with the prevailing temperature. The linear regulating function of the pressure regulator is designed in this range in such a way that it is adapted as favorably as possible to the inherently non-linear increase between the temperature and the vapor pressure. This section of the control process is maintained until the pressure has reached its limit value p _z (approx. 7.8 atü). Since this limit value should not be exceeded any further, the further pressure control process now takes place independently of the temperature until the end of the cooking process. The arrangement itself is ciTmdungsgemäße ^r ig in l. 2 shown schematically. The cooking liquid contained in the cooking vessel 1 is heated by steam heating, specifically with the aid of a heat exchanger 2 through which steam flows on one side and the cooking liquid on the other. The steam supply line to the heat exchanger 2 is denoted by 3 and the steam pipe by 4. A control valve 5 is switched on in the supply line 3. During operation, the cooking liquid flows through the tube 6 from the boiling kettle 1 into the heat exchanger 2 and through the pipe 7 from this back into the kettle 1. The temperature control during operation is carried out by the timer 8, which sets the respective setpoint on the controller 9, which changes over time. This regulates the supply of heat _to m heat exchanger 2 and thus the Kcsseltemptratur by operation of the valve 5. The control is performed in such a manner that the measured with the temperature sensor 10 on the pipe 7 temperature is compared with the target value and the control valve 5 is moved so long, until the measured temperature agrees with the setpoint. The pressure in the cooking vessel 1 is regulated with the aid of the control valve 11, which is actuated by the control galvanometer 12. This control generator is fed by one of the control devices 13, 14 or 15 designed as measuring bridges by switching on the changeover contacts 16, 16 'and 17, 17' in the diagonal of one of these bridges. The bridges 13, 14 and 15 and the Umschallckontakte 16, 16 'and 17, 17' are influenced by the temperature and the pressure in the kettle. The pressure is removed at point 18 and the temperature is determined with the temperature sensor 19. The pressure affects as indicated by the dashed line Line 20 schematically!) Is indicated, the position of the potentiometers 21, 22 and 23 as well as the Relay 24. The temperature affects the potentiometer 25 and the relay 26, which is indicated by the dashed line Line 27 is indicated. The influencing can take place on any A ¥ cise; she is in the drawing indicated by arrows which point to the object influenced by the respective measured variable. The control processes that are shown in the diagram of FIG. 1 come with the aid of the invention Arrangement in the following way: The temperature control takes place in the manner already described with the aid of the timer 8, according to the course shown in FIG. 1 by a thin line. The pressure control is carried out in several stages, depending on the temperature and also the pressure itself. As long as the temperature has not exceeded a certain value, taking the contacts 16 and 16 ', the line position and \ ^ characterized erbindcn the diagonal of the measuring bridge 13 with the control galvanometer 12. The potentiometer 21 of the measuring bridge 13 is controlled by the pressure, so that the bridge is balanced when the pressure has the value P ₁ . If in the course of the program control the temperature exceeds the value i _v (approx. 75 ° C.), the relay 26 responds and switches the contacts 16 and 16 '. As a result, the diagonal of the measuring bridge 14 is switched to the control galvanometer 12. The measuring bridge 14 is equipped with ζλνεί potentiometers 22 and 25, one of which, 22, is controlled by the pressure and the other, 25, is controlled by the temperature. This bridge is balanced when pressure and temperature are in a certain constant ratio to one another, so that in this control range the pressure rises as a linear function in the same way as the temperature. As soon as the pressure has risen to the value p ₂ , the relay 24 responds and with its contacts 17 and 17 'switches the control galvanometer 12 into the diagonal of the measuring bridge 15, the potentiometer 23 of which is exclusively dependent on the pressure. The bridge 15 is balanced when the pressure maintains the value p ₂ . This pressure is maintained until the end of the cooking process. Control devices with non-linear control functions can also be used in the arrangement according to the invention use, provided they are piece by piece in an appropriate approximation with the desired control function can be brought to congruence. P ^ TEXTAXSPRUC II Control arrangement for two (or more) intermeshed control loops (multiple control) with a setpoint adjuster, in particular a timer, which allows the control variables to be changed in a non- linear function sequence, characterized in that one controller (18, 19; 12; 11) for adapting the Characteristic of a controlled variable (p) to the (by. Scheduler 8 of the other controller 10, 9, 5) pre-controlled characteristic of another controlled variable (t) with auxiliary power, in particular electrical transducers (13, 14, 15), whose known per se Range switching depending on the one controlled variable (ρ) takes place (relays 24, 26) and whose preferably linear characteristic curves of different (average) steepnesses are influenced differently by the controlled variables (^ ₁ ; p, t; P ₂ ) . Considered publications:
German patents nos. 905 208, 719 612, 712 119, 818 975. 1 sheet of drawings © 909 610/101 8.