SU1023290A2 - Program regulating device - Google Patents

Abstract

DEVICE FOR PROGRAM 5HOGO REGULATION by. auth. St. hfe 978109, about t and h with the fact that, in order to increase the unreliability of the device, sequentially connected object model and add-on element with {Shch neni, the second input of which is connected to the output of the temperature sensor, are entered into it, and the output to the third input of the execution unit, the first input of the object model is connected to the output of the checkpoint element, and the second inputs to the memory outputs.

Description

The invention relates to software control of various technological processes, in particular; Temperatures during drying — capillary porous building materials and can be used in various industries, for example, in the building materials industry. According to the main author. St. No. 9781О9, there is a known device for pro-frame regulation, which contains a pulse generator, connected to the input of the sensor, whose outputs are connected to a memory unit, a delay element and a correction unit with a switching element, a parameter sensor connected to an analog-to-digital converter (ADC), the outputs of the ADC, the memory unit and the delay element are connected to a comparison unit whose outputs are connected through a digital-to-analog converter (DAC) with the inputs of the executive unit; and the correction unit, to another input of the executive unit. The output of the switching element is connected, and the output of the actuating unit is connected to a heater located together with the sensor in the control object. The operation of the device is based on the approximation of programs by the heating and cooling sections of the control and correction program 1. The disadvantages of this device are not sufficiently high program execution accuracy, noise immunity and reliability due to the effect of disturbances on the object and ADC, DAC, and the comparison element. The purpose of the invention is to increase the reliability of the device. The goal is achieved by introducing a serially connected object model and a full comparison element into the software control device, the second input of which is connected to the temperature sensor output and the input to the third input of the execution unit, the first input of the object model being connected to the output the delay element, and the second inputs with the outputs of the memory block. FIG. shows a diagram of the proposed device; in fig. 2 - functional block correction circuit; in fig. 3 is a graph of the adjustable parameter (temperature) in time. The device (Fig. 1) contains a pulse 1 pulse, a dial 2, a pulse distributor 3, elements OR 4-6, a block 7 of the corrokey, which switches the moment 8, which can be executed as R.- trigger, memory block 9, ele. Delay element 10, comparison element 11, object model 12, which is a physical object and controller model, temperature sensor 13, additional comparison element 14, analog-to-digital converter (A / D converter) 15, digital-to-analog converter (A / D converter) 16, execution unit 17, which is configured as a key 18, an adder 19, and a voltage source 20, as well as heating bodies 21, located together with the sensor 13 in the control object 22. Correction block 7 (Fig. 2) is made in the form of a circuit containing a switch 23, elements OR 24, and 25, a sawtooth voltage generator 26 (APS), an amplifier, a comparator 27, a trigger 28, and a delay element 29. The device works as follows. In the initial state, the output of element 8 is zero, the key 18 is open, i.e. the heater 21 is turned off, element 11 is locked, model 12 is turned off, the output voltage of the D / A converter 16 is zero. The first pulse of the generator 1 sets the distributor 3 to the state where the output of the OR 4 element is a signal that through the switch 23 and the OR 25 element sets the element 8 into one. This opens the key 18 and the voltage of the source 20 is applied to the heater 21. The magnitude increases with time. At the moment -b, preceding the first approximation node (timeb /), an impulse appears at the output of the element 6. This impulse block 9, the code M is retrieved, directly proportional to the parameter value at point 1. After a time determined by element 10 and required to sample the code from block 9, a comparison is made between the code M and the code corresponding to the actual value of the parameter at time point b. Moreover, the element 11 determines not only the magnitude of the difference b) - CD, but also its sign. At the same time, model 12 and in the element are turned on. Those 14 compares the actual value of the parameter 3 with the value produced by model 12. Element 14 also determines the magnitude and sign of the difference of the parameters. Consider the operation of the device in the mode of small deviations. 31023 At the moment of time -t three options are possible. The first. YY ,, (point 1). In this case, the output voltage of the D / A converter 16 and element 14 is zero and B, heater j, the previous voltage of source 20, i.e. the program goes on section 1-2. Second. (point 1). In this case, the voltage at the output of the DAC 16 is negative in sign, and in magnitude it is proportional to the spacing of the codes, and hence the difference in the values of the parameter at points 1 and 1. Output voltage; element 14 is also negative in sign, and in magnitude proportional to the difference in Q values at points 1 and 1. The resulting voltage, the output of adder 19, decreases and the program travels along section 1 2. Since the voltage applied to the heater 21 is proportional to the temperature difference at points 1 and l, and the interval -Lo -t is fixed, then at -t / v the adjustable napiaMeTp will come to the approximation node 2. Third. NJ-NJA O (point 1). In this case, the voltage at the output of the D / A converter 16 and the element is 14 positive in sign, a. in magnitude proportional to the difference in temperature values at points 1 and 1. For the reasons stated above, at time t 2. The adjustable parameter will be at point 2. At the same time (-tj), an output pulse OR 5 appears, which sets the trigger to 28 in, and the element 8 to zero. thus stopping the supply of voltage to the heater 21, i.e. the program goes along the cooling line. At time 4, a pulse appears at the output of the second node 6 (moment of time) at the output of the element OR 6, which from block 8 extracts directly proportional to the value of the controlled parameter at point 3. At the same time, AND pulse 24 arrives at the switch 23. . Through the time determined by the element 10 required for sampling the code from block .9, the code M and the code code are compared, respectively. value of the parameter at time point -tj. Simultaneously, the mo is turned on; Objective 12 and in element 14 occurs. Comparison of Audi Q / W. . . . In this case, there are three options. The first. Ma, -Y, (point 3). In this case, the output voltage of the D / A converter 16 and the element .14 is zero, the switch 23 04 closes the circuit: element OR 4 - element OR 25 - element 8. Program: go to section 2-4, Second.) (Point 3). In this case, the voltage at the output of the D / A converter 16 and element 14 is negative in terms of and the magnitude of the parameter values in points 3 and 3 are proportional to the switch. Switch 23 closes the circuit: element OR 6 — element AND 24 —General Tor 26. The impulse from the element OR 6, a generator 26 is started. Through a delay time directly proportional to the clock; the difference between the values of the parameter at points 3 and 3 and equal to the difference tj-i, at the output of the comparator 27 is the impulse, which through the element OR 25 sets the element 8 to unity, .e. the heater 21 is turned on at the rated power not at point 4, but at point 5. The signal of the comparator 27 stops the formation of the saw-tooth voltage of the generator 26. Third. Mg, -Ma..0 (point 3). In this case, the voltage at the output of the DAC 16 and element 14 is positive in sign, and is proportional to the difference in temperature values at points 3 and 3. The switch closes the circuit: OR 6 - OR element 24 - OR element 25. Pulse of OR6 element; element 8 is set to one. For the reasons stated above (point 1) at the time point, the adjustable pair-. It appears at point 4. Consider the operation of the device in critical modes - the mode of large ot-. cloning, which may be caused by a faulty D / A converter of the ADC, aemene, also by disturbances, deduces the regulator from the normal mode of operation fbi. In the large deviation mode, the cut-off mode (at the output of the DAC 16, the voltage is zero), the saturation mode (at the output of the DAC 16, the voltage reaches its maximum value). These modes are possible when large disturbances and malfunctions of one of blocks 11, 15. and 16 arise. In this case, the adjustment process is conducted only through the channel: sensor 13 element 14 - model 12 until critical disturbances are suppressed. . At the same time point (-Bd), the pulse at the output of the element OR 4, which sets the element .8 to unity, i.e. The program is on the line of nagch. revani.

Time intervals ii.-), (| ;; f-H.z) | equals .as and anHTenbHoctb of the approximating sites: (2.-to). (tA-te), are determined by the inertia of the object and the maximum value of energy i, which can be applied to the heater, as well as the required accuracy of the hypoxic effect.

The proposed device, has a high noise immunity, allows

significantly improve the accuracy of program execution and reliability of the device. The last circumstance in the whole range of processes (the processes of drying capillary building materials, diffusion processes, the processes of growing microcrystals) is extremely important and has a positive effect on quality (percentage of the yield of useful products).

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A / 2.J

Claims (1)

DEVICE FOR SOFTWARE REGULATION by. author St. No. 978109, characterized in that, in order to increase the reliability of the device, a series-connected model of the object and an additional comparison element are introduced into it, the second input of which is connected to the output of the temperature sensor, and the output to the third input of the executive unit, and the first input of the object model connected to the output of the delay element, and the second inputs - p outputs of the memory block. > 1 1023290 2