CN102541023A - High-precision control system for digital and analog combination - Google Patents
High-precision control system for digital and analog combination Download PDFInfo
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- CN102541023A CN102541023A CN201210016974XA CN201210016974A CN102541023A CN 102541023 A CN102541023 A CN 102541023A CN 201210016974X A CN201210016974X A CN 201210016974XA CN 201210016974 A CN201210016974 A CN 201210016974A CN 102541023 A CN102541023 A CN 102541023A
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Abstract
The invention discloses a high-precision control system for digital and analog combination, and the high-precision control system includes a detecting instrument, a digital controller, an actuator and a supervisory control computer, wherein the supervisory control computer is in communication connection with the digital controller. The system is characterized by further including an analog regulator, wherein an input end of the analog regulator and an input end of the digital controller are in series connection with an output end of the detecting instrument, and an output end of the analog regulator is connected with the actuator. The high-precision control system can realize higher precision control than a digital control system, and facilitates realizing communication and management at the same time.
Description
Technical field
The present invention relates to a kind of automatic control technology, is a kind of digital control automatic control technology that combines with simulation control of utilizing specifically.
Background technology
At present, along with the development and progress of digital circuit, automatic control system develops into digital control system from analog control system.Digital control system is to be the control core with the digitial controller, accomplishes specific control algolithm through the control program of writing topworks is controlled, to realize effective control and the adjusting to the Be Controlled object.Digitial controller is compared with the analog regulator of analog control system, has following advantage:
1, because the operational speed of a computer is fast, can use a digitial controller to control a plurality of loops, realize multi-use.
2, through programmed control, control algolithm is flexible, is convenient to the online modification controlling schemes.
3, utilize program higher than hardware algorithm circuit reliability.
4, influenced by environment and human factor little for digital signal.
5, be convenient to be connected, realize that control, management combine with communication with other devices communicatings such as computing machine.
For complex control system because reference mark and control loop are many; For ease of unified monitoring and management; Usually will calculate and be integrated into automatic control system, for example DCS control system (DIstributed Control System, scattered control system) through communication interface; It is the product that computer technology, system's control technology, network communications technology and multimedia technology combine, and friendly man-machine interface of window and powerful communication function can be provided.
Temperature control system is common automatic control system.Based on the above-mentioned advantage of digital control technology, and the needs for ease of managing and monitoring, HVAC automatic temperature-adjusting control system basically all is to adopt the automatic control system of digitial controller at present.Present domestic HVAC is controlled the more DDC digitial controller of sector application automatically, mainly with Siemens, Buddhist nun's Weir, the gloomy import in river or joint product are main suddenly, has reliable operation, characteristics easy to use, but expensive.These products can reach the control purpose better in general comfortableness environment temperature of control and the system to control temperature accuracy less demanding (below ± 0.3 ℃), satisfy customer requirements.Yet in some special places, as the calibrating chamber that is used to measure, scientific research test experience chamber, accurate manufacturing shop etc. are high to temperature control requirement; As reach ± environment that 0.1 ℃ of accuracy class requires in, the situation that control accuracy requires has then appearred satisfying not in digitial controller, often need increase equipment; Establishment complex control software (as adopting the numerical value approximatioss) improves control accuracy, and the time-consuming on the one hand cost of taking a lot of work rises, on the other hand; DDC Control Software application case in High Accuracy Control that these occur in recent years is few, and experience accumulation is few, and the working control effect is still undesirable; In the gloomy product its domestic application in river, precision does not surpass more than ± 0.3 ℃, during in approaching ± 0.2 ℃; The situation that the control loop oscillatory instability also occurs can't satisfy the High Accuracy Control requirement.
Digitial controller is based on the digital control approach of microprocessor, is a kind of sampling (dispersing) control system, and the control formula is:
In the formula, u (k)-regulator output
θ-sampling period
The k-sampling instant
k
pThe amplification coefficient of-regulator
Can know that by following formula digital control approach is a kind of sampling (dispersing) control system, is to come the calculation control amount according to the deviate of sampling instant; Information between sampled point can be lost to some extent; Signal through analog to digital conversion input operation link after, complicated integration, differentiate to change into add, subtract, multiplication and division calculates, the function of time of connection is converted into the interrupted function of time; Therefore error will inevitably be produced, high-precision requirement can not be satisfied.
The simple analog regulator that adopts is controlled; The problem that exists the more regulator of to accelerate just can expand again; And be integrated into existing digital monitor system, just need to increase or select for use the regulator of band Interface for digital communication, also increased equipment cost undoubtedly.
Summary of the invention
In view of this, the invention reside in provides a kind of high-precision control system, through numeral and the mode that simulation control combines, can't realize the High Accuracy Control problem to solve simple employing digitial controller.
The high-precision control system that digital-to-analogue provided by the invention combines comprises:
Measuring instrument, digitial controller, actuator and supervisory control comuter; Said supervisory control comuter is communicated by letter with said digitial controller and is connected; It is characterized in that: also comprise analog regulator; The input end of said analog regulator and the input end of said digitial controller are connected to the output terminal of said measuring instrument, and the output terminal of said analog regulator connects said actuator.
For realizing requiring not only can be carried out digital control but also can simulate control by controlling temperature to same according to different control accuracies; The output of said digitial controller connects said actuator through digital-to-analogue control transformation device; Said analog regulator also connects said actuator through said digital-to-analogue control transformation device; Digital-to-analogue control transformation device is used to realize the switching that output is connected between said actuator and said digitial controller and the said analog regulator, and said digital-to-analogue control transformation device connects the switching command of said supervisory control comuter with the execution supervisory control comuter.
Said digitial controller also connect other measuring instruments with through being connected other actuators to realize the regulating and controlling of a plurality of controlled devices or controlled variable.
The temperature instrument that said measuring instrument constitutes for the temperature transmitter that adopts the high precision thermal resistance, said actuator is the power regulating eqiupment of electric heater, to be used for the HVAC system.Said high precision is meant that the precision of thermal resistance will be higher than controlled control accuracy of temperature requirement.
The present invention adopts digitial controller and analog regulator input end to be connected in series in the output terminal of said measuring instrument; The standard signal of measuring instrument output can be simultaneously by digitial controller and analog regulator collection, make can realize being monitored and manage by controlling temperature with the communicate by letter supervisory control comuter that is connected of digitial controller, and the employing analog regulator is controlled actuator; Constitute and be with degenerative analog control loop; Be a kind of control system of continuous sampling, all signals are continuous functions of time variable, can passing ratio, the effect of integration, differential; On the reference mark of setting, continuously the deviation output control signal that occurs is revised; The experience accumulation that its control algolithm and pid parameter are adjusted decades, mature and reliable can realize High Accuracy Control smoothly.This system not only has the advantage of simulation control but also has numerically controlled advantage.Utilize technology of the present invention; The analog regulator integration is linked in the system that is made up of supervisory control comuter, digitial controller; Can realize not changing original digital control system structure basically, noting be used in increases complex hardware and software in the system, and convenient in application is flexible.Utilize analog regulator to carry out High Accuracy Control, not only guaranteed degree of regulation, and cheap.
Description of drawings
Fig. 1 is the high-precision control system schematic diagram that a kind of digital-to-analogue of the present invention combines;
Fig. 2 is a kind of schematic diagram of temperature control system.
Embodiment
For clearly demonstrating the scheme among the present invention, provide preferred embodiment below and be described with reference to the accompanying drawings.
As shown in Figure 1; It is a kind of schematic diagram of high-precision control system of digital-to-analogue combination; High-precision control system comprises measuring instrument 1-n, digitial controller, actuator 1-n and supervisory control comuter, and said supervisory control comuter is communicated by letter with said digitial controller and is connected, and also comprises analog regulator 1-n; The be connected in series output terminal of said measuring instrument 1 of the input end of analog regulator 1 and the input end of said digitial controller, the output terminal of said analog regulator connects said actuator 1.For the less demanding controlled volume of degree of regulation, the digital regulation loop that can be made up of the actuator 1-n of measuring instrument 1-n and digitial controller and correspondence automatically adjusts.Therefore; For realizing the switching of digital control loop and analog control loop; Need to adopt digital-to-analogue control transformation device; As shown in the figure, this moment, the output of digitial controller connected said actuator through digital-to-analogue control transformation device, and said analog regulator also connects said actuator through said digital-to-analogue control transformation device; Digital-to-analogue control transformation device is used to realize the switching that output is connected between said actuator and said digitial controller and the said analog regulator, and said digital-to-analogue control transformation device connects the switching command of said supervisory control comuter with the execution supervisory control comuter.
For the demanding controlled variable of control accuracy, the analog regulation loop that then is made up of measuring instrument, digitial controller, analog regulator and actuator is regulated.Certainly,, then can control actuator, need utilize this moment digital-to-analogue control transformation device that analog control loop is broken off, and digitial controller is connected with actuator by digitial controller if this controlled device is not high to regulating accuracy requirement in the case at certain.Digital-to-analogue control transformation device can be controlled by supervisory control comuter.Supervisory control comuter can also be monitored and system is managed each parameter of control system through digitial controller.
According to different controlled devices and different adjusting parameters; Above-mentioned measuring instrument 1-n selects the different detection instrument respectively for use; Corresponding actuator can constitute different control system such as for example temperature control loop, pressure control loop, flow control circuit according to being transferred object and controlled volume to select.
Fig. 2 is an example with the humidity control system that is used for HVAC, specifies.This system relates to certain measurer factory central air conditioner system, utilizes the temperature of central air conditioner system control accurate measurement chamber, standard chamber and reference chamber, and wherein accurate measurement chamber and standard chamber temperature standard are 20 ± 0.5 ℃, and the reference chamber standard is 20 ± 0.1 ℃.This temperature control system by refrigeration unit and electric heater associated working with the control temperature.Therefore, accurate measurement chamber and standard chamber adopt digitial controller to control, and can satisfy accuracy requirement, and promptly accurate measurement chamber control system is to be made up of accurate measurement room temperature sensor and digitial controller and accurate measurement chamber power regulating eqiupment, electric heater; The standard chamber control system is to be made up of standard chamber temperature sensor and digitial controller and standard chamber power regulating eqiupment, electric heater; Digitial controller adopts the gloomy DX-9100 in river, and it is 20 ± 0.3 ℃ that this system temperature changes measured value.Although on software, adopts peek value approximatioss to revise when reference chamber adopts digitial controller, control accuracy approaching ± the control loop vibration appears 0.2 ℃ the time, so be integrated into analog regulator and carry out High Accuracy Control.In the scheme of Fig. 2; Be integrated into the artificial intelligence regulator; The input end of analog regulator and the input end of digitial controller are connected in series in the output terminal of the corresponding transmitter of reference chamber temperature sensor; Utilize analog regulator control reference chamber power regulating eqiupment to regulate the power of electric heater, the standard electric conversion of signals of the transmitter output that digitial controller is then corresponding with the reference chamber temperature sensor is that digital signal offers supervisory control comuter, realizes unified monitoring of temperature and management; Analog regulator has adopted XMTD-2000; Reference chamber temperature actual measured value is 20 ± 0.08 ℃, has satisfied ± 0.1 ℃ high-acruracy survey requirement, and the price of a homemade analog regulator XMTD-2000 is only about thousand yuan.It is to carry out temperature control with digitial controller that supervisory control comuter is controlled reference chamber through digital-to-analogue control transformation device, still controls with analog regulator.
For the method and apparatus of being set forth among each embodiment of the present invention, all within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the high-precision control system that combines of a digital-to-analogue; Comprise measuring instrument, digitial controller, actuator and supervisory control comuter; Said supervisory control comuter is communicated by letter with said digitial controller and is connected; It is characterized in that: also comprise analog regulator, the be connected in series output terminal of said measuring instrument of the input end of said analog regulator and the input end of said digitial controller, the output terminal of said analog regulator connects said actuator.
2. the high-precision control system that digital-to-analogue as claimed in claim 1 combines; It is characterized in that: the output of said digitial controller connects said actuator through digital-to-analogue control transformation device; Said analog regulator also connects said actuator through said digital-to-analogue control transformation device; Digital-to-analogue control transformation device is used to realize the switching that output is connected between said actuator and said digitial controller and the said analog regulator, and said digital-to-analogue control transformation device connects the switching command of said supervisory control comuter with the execution supervisory control comuter.
3. the high-precision control system that combines of according to claim 1 or claim 2 digital-to-analogue, it is characterized in that: said digitial controller also connects other measuring instruments and actuator.
4. the high-precision control system that combines of according to claim 1 or claim 2 digital-to-analogue, it is characterized in that: the temperature instrument that said measuring instrument constitutes for the temperature transmitter that adopts the high precision thermal resistance, said actuator is the power regulating eqiupment of electric heater.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110147131A (en) * | 2019-05-09 | 2019-08-20 | 东南大学 | A kind of bimodulus temperature-adjusting circuit and control method for sensor heating element |
| CN110793546A (en) * | 2019-11-01 | 2020-02-14 | 南京国电南自维美德自动化有限公司 | Optimization method and system for inertial equipment adjustment and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110147131A (en) * | 2019-05-09 | 2019-08-20 | 东南大学 | A kind of bimodulus temperature-adjusting circuit and control method for sensor heating element |
| CN110793546A (en) * | 2019-11-01 | 2020-02-14 | 南京国电南自维美德自动化有限公司 | Optimization method and system for inertial equipment adjustment and storage medium |
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Application publication date: 20120704 |