SU1614002A1 - Apparatus for controlling temperature of heating of multiple-zone objects - Google Patents

Abstract

The invention relates to systems for automatic control of the heating temperature of multi-zone objects and can be used when conducting heat-resistance tests of equipment. The aim of the invention is to improve the accuracy of software temperature control in the heating zones of an object by controlling the heating power of the entire furnace according to the central zone signal and eliminating temperature variation in the peripheral zones by introducing weights to the main control signal as a function of temperature differences between the central and peripheral heating zones. The device contains the number of all heating zones of the heater, storage elements, temperature sensors, measuring amplifiers, algebraic adders, multiplying digital-analog converters according to the number of peripheral heating zones, as well as the sensor and measuring amplifier of the ambient temperature, clock generator, pulse distributor, delay element, shaper of short pulses, analog-digital converter, block of number registers, program control block. 1 il.

Description

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The invention relates to systems for automatic control of the heating temperature of multi-zone objects and can be used when conducting heat-resistance tests of equipment or reproducing in laboratory conditions thermal conditions of equipment operation.

The aim of the invention is to improve the accuracy of software temperature control in the heating zones of an object,

The drawing shows a functional diagram of the device.

The device contains a heated object 1 with heaters 2 central heating zones and peripheral zones, sensors 4 temperature of the central zone and f, peripheral zones. Measuring amplifiers 6 of the central zone and 7 | -7ts peripheral zones, sensor 8 of the ambient temperature, measuring amplifier 9

signal of the ambient temperature sensor, algebraic adders 10 of the central zone and 1C-1 |, peripheral zones, 12 clock pulse generator, distributor of 13 pulses, switch 14i delay element 15, shaper 16 short pulsesB, analog-digital converter 17, block 18 number registers software The multi regulation unit 19 multiplies digital-to-analog converters 20, -20 by the number of peripheral heating zones, executive elements 21 central zones and 22, -22 j peripheral heating zones.

The device works as follows.

In the initial state, the software control unit 19 contains information on the heating modes of the multi-zone object 1. The control signal Hc) from the output of the software control unit 19 acts on the input of the actuating element 21, and through the multiplying digital-analog converters 20 and on the inputs of the executive elements 22 , Using heaters 2 and 3, the multi-zone object 1 is heated to a predetermined temperature.

The signal is proportional to the heating temperature in the central zone from the outputs of sensor 4 through the measuring amplifier 6 and algebra-. The scaled adder 10 enters the software control block 19 to: correct and monitor the specified heating mode. In the algebraic adder 10, a signal proportional to the temperature in the central zone is corrected for the ambient temperature (the signal proportional to its value is removed from the sensor outputs 8 and through the measuring amplifier 9 is fed to the second input of the algebraic summer 10). Thus, in the central heating zone, the control loop of the central heating zone temperature feedback through the software program regulating block 19,

Signals proportional to the temperature of the Lagrean in the peripheral zones, coming from the outputs of sensors 5, through measuring amplifiers; 7, affect the inputs of algebraic adders 1 1, the second inputs of which are affected by signals X proportional to the values of temperature in the central heating zone, Na output algebraic adders P. contains the difference. L (X) (where is the gain of the 1st algebraic adder P) of the indicated signals, which through the switch 14 is fed to the input of the analog-digital converter 17.

After the analog-to-digital converter, the digital code AND, equivalent to the difference of & enters the corresponding register register block 18 and further to the digital inputs of the multiplying digital

5 ro-analog converter 20,

The operation of the switch 14, gating the anapographic converter 1 7 and the registers of the block 18 is carried out by the distributor 13 s0 pulses in accordance with the clock pulses produced by the generator 12, Distribute 13 pulses alternately in a predetermined sequence and with a frequency dependent on the clock frequency pulse generator 12, opens from the 1st to the 5th channels of the switch 14, At each such point in time, in the corresponding peripheral heating zone, the loop of regu lating the temperature of the peripheral zone operates with feedback through the switch 14, analog-to-digital converter 17, block 18 of the number registers, the corresponding multiplying digital-to-analog converter 20 and the actuating element 22. This is an iterative procedure

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which is periodically produced for all peripheral zones. The frequency of implementation can be changed by adjusting the generator 12 and changing the frequency of its clock pulses. Thus, the heating temperature of a multi-zone object is controlled by a software control unit with closed feedback in the central heating zone, and the possible temperature variation in peripheral zones heating in relation to the central zone is eliminated in additional control loops by introducing weights to the main control signal of the program regulator 19.

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formula of invention

st ro ro gi pr zo an ed

A device for controlling the heating temperature of multi-zone objects, containing heater heaters and connecting actuators with them, temperature sensors and algebraic central and peripheral heating zones connected to them through measuring amplifiers, and an ambient temperature sensor connected through their measuring amplifiers the second input of the algebraic adder of the valuable heating zone, a software control unit whose input is connected to the output of the algebraic su The centralization zone of the central heating zone, the switch whose information inputs are connected to the outputs of the algebraic adders of the peripheral heating zones, and the control inputs are connected to the outputs of the pulse distributor by the number of peripheral heating zones, the input of which is connected to the clock generator. so that, in order to increase the accuracy of software control | Temperatures in the heating zones, an analog-digital converter, a delay element, a shaper of short pulses, isters and multiplying digital-analog converters by the number of peripheral heating zones, the gate input of the analog-digital converter is connected via a series of short pulses connected in series and a delay element T to the output of the clock generator, and its information input to the register block by number peripheral heating zones are connected to the corresponding outputs of the pulse distributor, the outputs of the register block are connected to the digital inputs of the smart zhayuschih digital

converters, and its information input is connected to the output of an analog-to-digital converter, the output of the software control unit is connected to the executive element of the central zone, as well as to the analog inputs of multiplying digital-to-analog converters, whose outputs are connected to the inputs of executive elements of the corresponding peripheral

heating zones.

Claims (1)

Claim A device for controlling the heating temperature of multi-zone objects, containing, according to the number of heating zones, heaters and actuating elements connected to them., Temperature sensors and algebraic adders of central and peripheral heating zones connected to them through measuring amplifiers, an ambient temperature sensor connected through its measuring amplifier with the second input of the algebraic adder of the central heating eon, a software control unit, the input of which is connected to the output of the algebraic the adder of the central heating zone, a switch, the information inputs of which are connected to the outputs of the algebraic adders of the peripheral heating zones, and the control inputs, by the number of peripheral heating zones, are connected to the outputs of the pulse distributor, the input of which is connected to the clock pulse generator, distinguishing with the fact that, in order to improve the accuracy of programmed temperature control in the heating zones, an analog-to-digital converter, a delay element, a short-pulse shaper, a p registers and multiplying digital-to-analog converters according to the number of peripheral heating zones, and the gate input of the analog-to-digital converter is connected via series-connected short-pulse shaper and the power element with the output of the clock generator, and its information input - with the output of the switch, the recording control entries of the register block by the number of peripheral heating zones are connected to the corresponding outputs of the pulse distributor, the outputs of the register block are connected to the digital inputs multiplying digital converters, and its information input is connected to the output of the analog-digital converter, the output of the software control unit is connected to the executive element of the central zone, as well as to the analog inputs of the multiplying digital-analog converters, the outputs of which are connected to the inputs of the executive elements of the corresponding peripheral heating zones. * Compiled by I. Buckwheat