SU954969A1 - Inertial process program adjustment device - Google Patents

Description

The invention relates to the automatic regulation of technological processes and can be used in the heat treatment of products from reinforced concrete. It is known a control device comprising a sensor, a setting device, a heater, a measuring and regulating unit with a switching element, and a comparison element i. To implement the heating and cooling modes, this device is used as a setting effect in the form of a time-varying (}) function generated by accumulating the reference signal and storing it for the entire time of lifting or cooling, which increases the exposure of the setting function (and, therefore, and control of interference. Closest to the present invention is a device for programmatically controlling inertial processes, comprising a sensor, a setting device, a memory unit ({program hummer (delay element), a generator, an execution unit whose output is connected to a heater, and the first input is to a comparison element, as well as the switching element 2. In the case of application of continuous adjustment by derivative, this device is difficult to set up, and with two-step adjustment of the output parameter, the dynamic accuracy decreases or requires with a significant reduction in the time interval of the quantization interval, which makes it difficult to implement the device. The purpose of the invention is to simplify the device. This goal is achieved by having a device for software control of inertial processes containing a parameter sensor and a limit parameter setting device connected to the information inputs of the memory block. ti, the programmer and the comparison element connected in series and the executive unit, as well as the impedance generator, contain an adder, the inputs of which are connected to the outputs of the nporpa.vw generator and the memory block, and the output are connected to the first input of the comparison element, the second parameter of which is connected to the parameter sensor, and the output is the control input of the memory block, with the output of the pulse generator connected to the second input of the executive body.

FIG. 1 shows a structural electrical device diagram; in fig. 2 is a timing diagram of the adjustment process.

The device contains a sensor 1 parameter, an object 2 of regulation, a heater 3, an ad sensor 4 limit parameter, an analog-digital converter, a tel 5, a memory block 6, a programmer 7, an adder 8, a comparison element 9, a generator O, an impulse body 1.1. .

FIG. 2 shows a timing diagram of the control process, where U is the sensor SIRnal; U / Beep - Tasks; LO increment of the reference signal; U (s - stabilization level; - power supplied to the heater; Up generator signal; T - quantization period.

The device works as follows.,.

A single sensor signal 1, characterizing the temperature of the control object 2, is converted by an analog-to-digital converter 5 to a digital code. The setting unit 4 sets the stabilization level (isotherm) of the controlled parameter pall of.- Shaper 7 of the program sets the values of the signal increment of the task U Uo, for the quantization period T. (in digital code), and also set the time for switching the program from

parameter stabilization in relshm cooling. The 1O generator sets the quantization period T, the start times of which are determined by the time stamps U f. . When the device is turned on, the first impulse of the generator 10 U through the actuator 11 turns on the heater 3, and the initial value of the signal of the analog-digital converter 5 (characterizing the initial temperature of the object 2 of the control-d) is recorded in the memory side 6 of the memory and summed by the adder 8 7 program by the increment value of the reference signal L and the Total signal (in the code) U is compared by element 9 of the comparison with the current value of the output signal of the analog-digital converter 5 (digital signal U of the signal U,), During the first quantization period T and at the moment of coincidence of these signals, a pulse appears at the output of the reference element, switching off the heater 3 (at the first input) through the execution unit 11 and acting (at the third input) on the memory block 6, which writes into its cells, the code value of the output signal of the analog-digital converter 5. After this, the process of natural cooling begins, which lasts until a second mark of the generator 10 Up appears, re-activating the heater 3 times execution block ca. 11 .. Then the process is repeated several times until the sensor signal 1 Beat reaches the stabilization level Uct recorded in the setting unit 4. This memory level is limited by the memory of unit 6, after which the stabilization mode of the parameter d begins to be limited on the upper level U gf

The Executive body 11 includes a heater 3. the time of occurrence of the marks and J. from the generator 10 and turns off, at the moments of equality of the input signals of the comparison element 9, carried out a pulse-width modulation of the control action. Testing the cooling mode. A program moment begins in the preset shaper 7 with the appearance at its output of a signal characterizing the desired value of the signal increment with a negative sign. The program for regulating the heat treatment process is completed when the object reaches 2 guided level of a given temperature. Setting the device to control a particular object is reduced to the selection of the magnitude of the signal increment — the tasks and quantization period T.

Thus, the proposed device for software control of inertial processes makes it possible to most easily control the process of heat treatment of various objects according to a given program and with the required quality of regulation.

Claims (2)

1. Handbook of electrical instrumentation devices. Ed. KK Ilyushin. L., Energie, 1973, p. 313-350. 2. USSR author's certificate number 48366O, cl. Q O5 D 23/19, 1975 (prototype). id wj (fiUSi 1 minute}