CN204347631U - Based on the tank level control system of fuzzy - Google Patents
Based on the tank level control system of fuzzy Download PDFInfo
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- CN204347631U CN204347631U CN201520018951.1U CN201520018951U CN204347631U CN 204347631 U CN204347631 U CN 204347631U CN 201520018951 U CN201520018951 U CN 201520018951U CN 204347631 U CN204347631 U CN 204347631U
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- liquid level
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- over circuit
- water pump
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Abstract
The utility model discloses a kind of tank level control system based on fuzzy, comprise fuzzy controller, level set device, D/A change-over circuit, water pump, the driving circuit that water pump is driven, liquid level sensor, A/D change-over circuit that liquid level is detected; The preset signals input end of the output terminal access fuzzy controller of level set device, fuzzy controller, D/A change-over circuit, driving circuit, water pump are linked in sequence successively, liquid level sensor is for gathering the liquid level of water pump, the output terminal of liquid level sensor connects A/D change-over circuit, the measured signal input end of the output terminal access fuzzy controller of A/D change-over circuit.The utility model forms closed-loop system, has both remained the advantage of traditional PI D, and has combined again the advantage of fuzzy control, and reached higher precision and stability.Be applicable to the environment needing measuring accuracy higher, and measure conveniently, real time data can be obtained from light-emitting diode display.
Description
Technical field
The utility model relates to Liquid level field, particularly relates to a kind of tank level control system based on fuzzy.
Background technology
Water pump generally directly accurately can not realize the control of liquid level, now conventional method adopts PID controller to control variation in water pressure, but PID controller requires the accurate mathematical model of design, and because water system pipeline is long, caliber is large, the pressurising of pipe network is all slower, therefore the water pump tank level control system system of prior art is a Large-lag System, for time become, the process of the complication system such as non-linear is very difficult.
Utility model content
The utility model object is to overcome the deficiencies in the prior art, the utility model provides a kind of tank level control system based on fuzzy, while the advantage retaining traditional PID control, in conjunction with the advantage of fuzzy control, liquid level is controlled in real time, reaches higher precision and stability.
The purpose of this utility model and solve its technical matters and realize by the following technical solutions.
Based on the tank level control system of fuzzy, comprise fuzzy controller, level set device, D/A change-over circuit, water pump, the driving circuit that water pump is driven, liquid level sensor, A/D change-over circuit that liquid level is detected.
The preset signals input end of the output terminal access fuzzy controller of level set device, fuzzy controller, D/A change-over circuit, driving circuit, water pump are linked in sequence successively, liquid level sensor is arranged in water pump, for gathering the liquid level of water pump, the output terminal of liquid level sensor connects A/D change-over circuit, the measured signal input end of the output terminal access fuzzy controller of A/D change-over circuit.
The liquid level of liquid level sensor Real-time Collection water pump, accesses the measured signal input end of fuzzy controller after the output terminal of liquid level sensor is treated as digital quantity liquid level by A/D change-over circuit;
Fuzzy controller is using the input quantity of the difference between digital quantity liquid level and setting liquid level as fuzzy controller, after carrying out ratio, differential and integral algorithm by fuzzy controller, export control signal, control signal output terminal carries out Liquid level by D/A change-over circuit access driving circuit to water pump.
During use, first provided the preset value of liquid level to fuzzy controller by level set device; Measure actual liquid level altitude signal by liquid level sensor again, after the process of A/D change-over circuit, be supplied to fuzzy controller; Owing to there is difference between the preset value of liquid level and measured value, after ratio, differential and integral algorithm being carried out to the signal obtained by fuzzy controller, the control signal to water pump can be obtained; The control signal obtained is supplied to driving circuit through D/A change-over circuit by last fuzzy controller, drives water pump, reaches the control to liquid level; The utility model is a closed-loop system based on the tank level control system of fuzzy, has on-line parameter Self-tuning System ability.Be worth pointing out; ratio, differential and integral algorithm that the Fuzzy PID that the control procedure of the utility model fuzzy controller uses is prior art, the utility model protection is based on the syndeton between the assembly of the tank level control system of fuzzy and assembly.
Fuzzy controller designs for substrate with single-chip microcomputer or DSP, can select different single-chip microcomputers or DSP according to the requirement of different measuring precision; Because DSP has the advantages such as Survey control precision is high, cost is low, volume is little, low in energy consumption, thus can make unit, be widely used in the industry such as chemical industry, farmland and liquid level is accurately controlled.
Level set device comprises keyboard, sets liquid level by input through keyboard, and setting liquid level is transferred to fuzzy controller, and input through keyboard is tradition and conventional input tool, and it is cheap, easy to use.
D/A change-over circuit and A/D change-over circuit require to select different resolution according to Surveying Actual Precision, and select the frequency of operation of D/A change-over circuit and A/D change-over circuit.
More preferably, liquid level sensor is the pressure transducer measuring liquid level, comprises isolated form diffuse si sensitive element or ceramic capacitive pressure sensitive sensor.The signal that institute's liquid level sensor records becomes digital quantity and sends into single-chip microcomputer or DSP after the process of A/D change-over circuit.
More preferably, the utility model also comprises light-emitting diode display, and the Signal aspects output terminal of described fuzzy controller is connected with light-emitting diode display, and described light-emitting diode display is for showing liquid level and the digital quantity liquid level of actual measurement of the setting of level set device.Intuitively for user provides detection data, user can be convenient to and system be analyzed and monitors by light-emitting diode display.
Compared with prior art, advantage is the utility model:
The tank level control system based on fuzzy that the utility model provides, form closed-loop system, both the advantage of traditional PI D had been remained, combine again the advantage of fuzzy control, first by keyboard to set up liquid level, detect liquid level in real time by liquid level sensor, the real-time regulable control of liquid level is realized again by fuzzy controller, reach consistent with setting liquid level, liquid level is controlled in real time, reaches higher precision and stability.Be applicable to the environment needing measuring accuracy higher, and measure conveniently, real time data can be obtained from light-emitting diode display.
Accompanying drawing explanation
The basic structure schematic diagram of the tank level control system based on fuzzy that Fig. 1 provides for the utility model;
The concrete enforcement structural representation of the tank level control system based on fuzzy that Fig. 2 provides for the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Below in conjunction with accompanying drawing, the utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection domain of the present utility model with this.
As shown in Fig. 1, based on the tank level control system of fuzzy, comprise fuzzy controller, level set device, D/A change-over circuit, water pump, the driving circuit that water pump is driven, liquid level sensor, A/D change-over circuit that liquid level is detected.
The preset signals input end of the output terminal access fuzzy controller of level set device, fuzzy controller, D/A change-over circuit, driving circuit, water pump are linked in sequence successively, liquid level sensor is for gathering the liquid level of water pump, the output terminal of liquid level sensor connects A/D change-over circuit, the measured signal input end of the output terminal access fuzzy controller of A/D change-over circuit.
The liquid level of liquid level sensor Real-time Collection water pump, accesses the measured signal input end of fuzzy controller after the output terminal of liquid level sensor is treated as digital quantity liquid level by A/D change-over circuit;
Fuzzy controller is using the input quantity of the difference between digital quantity liquid level and setting liquid level as fuzzy controller, after carrying out ratio, differential and integral algorithm by fuzzy controller, export control signal, control signal output terminal carries out Liquid level by D/A change-over circuit access driving circuit to water pump.
In Fig. 1, in the function structure chart of the utility model based on the tank level control system of fuzzy, liquid level sensor detects actual liquid level height, after the process of A/D change-over circuit, send into fuzzy controller interface.Setting liquid level is knocked in by keyboard, this value with there is certain difference through the liquid level signal that A/D change-over circuit is converted, after carrying out ratio, differential and integral algorithm by fuzzy controller, its output signal carries out Liquid level by D/A change-over circuit and driving circuit to water pump.The actual liquid level height detected in the liquid level of input through keyboard and control procedure can be shown by light-emitting diode display in real time.
If Fig. 2 is another preferred implementation of the present utility model, liquid level sensor in Fig. 2 and A/D change-over circuit form the liquid level signals collecting in embodiment, after filtering, amplification, sampling and A/D conversion, send into single-chip microcomputer or DSP, compare and calculation deviation with to determining voltage signal.Single-chip microcomputer or DSP complete the function of fuzzy controller, and its output signal carries out Liquid level by D/A conversion circuit and driving circuit to water pump simultaneously, thus completes the dynamic conditioning of liquid level.Whole system constitutes a closed-loop system, thus the utility model has the ability of good on-line parameter Self-tuning System based on the tank level control system of fuzzy, there is good anti-interference, good dynamic perfromance can be obtained, also there is stronger adaptive ability.
D/A change-over circuit, A/D change-over circuit require to select different resolution according to Surveying Actual Precision, select the frequency of operation of D/A and A/D change-over circuit simultaneously, can select frequency of operation high as far as possible for improving precision.
Liquid level sensor is a kind of pressure transducer measuring liquid level, comprises isolated form diffuse si sensitive element or ceramic capacitive pressure sensitive sensor.Measured signal becomes digital quantity and sends into single-chip microcomputer or DSP after the process of A/D change-over circuit.
Still need code and the data of preservation after single-chip microcomputer or DSP external memorizer store power-off, can be used as data exchange unit, simultaneous memory connects a power-down protection circuit, a long-time difficult problem of preserving after solving real-time parameter power down; Single-chip microcomputer or DSP are connected with host computer by serial port RS232 simultaneously, and the data communication that serial port RS232 can realize single-chip microcomputer or collect between DSP and host computer, strengthens the storage to data and analyzing and processing.
In the present embodiment, fuzzy controller relates generally to 3 PID parameter Kp (scale-up factor), Ki(integral coefficient) and Kd(differential coefficient), by fuzzy control rule and fuzzy reasoning determination fuzzy inference rule table, then these 3 controling parameters in fuzzy controller are set by fuzzy inference rule table.Fuzzy control rule and fuzzy reasoning are the mature technology of field of fuzzy control.
Generally in debug process, increase open loop Proportional coefficient K p, the response speed of system being accelerated, also helping reduction static difference when there being static difference, but excessive scale-up factor can increase system overshoot again, even produces vibration, make system unstable; When therefore testing Tuning at the scene, the adjustment repeatedly of first ratio, rear integration, again differential need be carried out.Integral time and proportional time are inversely proportional to, and integral coefficient is larger, and namely integral time is shorter, cause overshoot excessive.Differential coefficient and derivative time are directly proportional, and differential coefficient is excessive, and namely derivative time is excessive, cause system unstable.
Below be only preferred implementation of the present utility model; be noted that for those skilled in the art; under the prerequisite not departing from the utility model principle, can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (7)
1. based on the tank level control system of fuzzy, it is characterized in that: comprise fuzzy controller, level set device, D/A change-over circuit, water pump, the driving circuit that water pump is driven, liquid level sensor, A/D change-over circuit that liquid level is detected;
The preset signals input end of the output terminal access fuzzy controller of described level set device, fuzzy controller, D/A change-over circuit, driving circuit, water pump are linked in sequence successively, described liquid level sensor is for gathering the liquid level of described water pump, the output terminal of liquid level sensor connects A/D change-over circuit, the measured signal input end of the output terminal access fuzzy controller of A/D change-over circuit.
2., according to the tank level control system based on fuzzy described in claim 1, it is characterized in that: described fuzzy controller with single-chip microcomputer or DSP for substrate.
3. according to the tank level control system based on fuzzy described in claim 1, it is characterized in that: described level set device comprises keyboard, by described keyboard for inputting the setting liquid level of water pump, and described setting liquid level is transferred to described fuzzy controller.
4. according to the tank level control system based on fuzzy described in claim 1, it is characterized in that: also comprise light-emitting diode display, the Signal aspects output terminal of described fuzzy controller connects light-emitting diode display.
5. the tank level control system based on fuzzy according to claim 4, is characterized in that: described light-emitting diode display is for showing liquid level and the digital quantity liquid level of actual measurement of the setting of level set device.
6. the tank level control system based on fuzzy according to claim 1, is characterized in that: described liquid level sensor is the pressure transducer measuring liquid level.
7. the tank level control system based on fuzzy according to claim 6, is characterized in that: described liquid level sensor comprises isolated form diffuse si sensitive element or ceramic capacitive pressure sensitive sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520018951.1U CN204347631U (en) | 2015-01-13 | 2015-01-13 | Based on the tank level control system of fuzzy |
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| CN201520018951.1U CN204347631U (en) | 2015-01-13 | 2015-01-13 | Based on the tank level control system of fuzzy |
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| CN204347631U true CN204347631U (en) | 2015-05-20 |
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| CN201520018951.1U Expired - Fee Related CN204347631U (en) | 2015-01-13 | 2015-01-13 | Based on the tank level control system of fuzzy |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204533A (en) * | 2015-10-09 | 2015-12-30 | 佛山科学技术学院 | Liquid level control method |
| CN106205344A (en) * | 2016-07-04 | 2016-12-07 | 吉林大学 | Four hold high water tank Control release system |
| CN106647832A (en) * | 2016-12-29 | 2017-05-10 | 西安理工大学 | CompactLogix-based fuzzy self-tuning PID liquid level control method |
-
2015
- 2015-01-13 CN CN201520018951.1U patent/CN204347631U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204533A (en) * | 2015-10-09 | 2015-12-30 | 佛山科学技术学院 | Liquid level control method |
| CN106205344A (en) * | 2016-07-04 | 2016-12-07 | 吉林大学 | Four hold high water tank Control release system |
| CN106647832A (en) * | 2016-12-29 | 2017-05-10 | 西安理工大学 | CompactLogix-based fuzzy self-tuning PID liquid level control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20180113 |