CN205318259U - Water temperature control system - Google Patents
Water temperature control system Download PDFInfo
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- CN205318259U CN205318259U CN201521109915.2U CN201521109915U CN205318259U CN 205318259 U CN205318259 U CN 205318259U CN 201521109915 U CN201521109915 U CN 201521109915U CN 205318259 U CN205318259 U CN 205318259U
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Abstract
The utility model discloses a water temperature control system, include: temperature detection module, data processing module, key entry module, display module, the next controller, communication module, upper control ware, switch module and heating module, the actual temperature of temperature detection module real -time detection is with passing to the next controller on data are behind data processing module, and the key entry module is used for user interaction to set up the target temperature, the display module for show actual temperature and target temperature, the upper control ware is given with actual temperature and target temperature data upload to the next controller, and the upper control ware adopts because control of PID algorithm and PWM control mode combine together according to the difference in temperature of actual temperature and target temperature, calculates the break -make of control signal through switch module controlled heating module to it realizes the accurate control to the temperature to change temperature heat time. The utility model discloses can realize that fractional error is less, the accuracy is high, and the response is rapid, and stability is good, and the energy resource consumption is few.
Description
Technical field
The utility model relates to a kind of water temperature control system, belongs to technical field of temperature control.
Background technology
The water part that to be human survival indispensable with development, water temperature be then water numerous parameters in very important one. Along with water temperature is had very strict requirement by the continuous progress of science and technology, industrial production and daily life. In industry field, the accurate control of water temperature can be ensured carrying out smoothly of the production automation. In daily life, people can free set water temperature, to reach the demand of oneself. It thus is seen that Intelligent water control techniques has good application prospect and Practical significance. Water temperature control is exactly to make water temperature reach the requirement of expection, after system obtains environmental parameter, in conjunction with various modern technique and science algorithm, it is achieved quality product improves the object with production safety. At present, accurate water temperature control system is widely used in as a kind of modern technique and produces in life, and in addition, the accuracy of control determines quality product. The temperature of micro-chip control water, improves controllability effectively, it is achieved the target of intelligence. Traditional water temperature control performance is not good, even has instability, phenomenon out of control. Why there will be this kind of phenomenon, it is that the control object inertia of this class is bigger, it is easy to cause delayed because tradition water temperature control adopts resistance current-limiting mode.
Owing to the control object of water temperature control system has hot storage capacity greatly, the feature that inertia is also bigger. All there is certain resistance in the flowing of water in container or heat transmission, thus can be attributed to a rank Great inertia link with purely retarded. In general, thermal process has bigger delayed mostly, and the response of any signal all can be postponed for some time by it, makes to produce phase shift between output and input. For some exist the transient process control of big hysteresis characteristic like this, following several control program in general can be adopted:
(1) output switch amount control:
The method that output switch amount controls can simply be adopted for the process that inertia is bigger. This kind of method controls the state of output by comparing the deviation of set-point and controlled parameter: switch or break-make, and therefore control process is very simple, also easily realizes. But owing to exporting manipulated variable only two states, the speed that controlled parameter is changed in the two directions is maximum, therefore easy strong-willed feedback loop produces vibration, automatic control system can be produced very disadvantageous impact, even can not meet system to the requirement of control accuracy because of the frequent movement of output switch. Therefore, this kind of control program generally adopts in Great inertia system is to the less demanding situation of control accuracy and kinetic characteristic.
(2) ratio control (P control)
The output that the feature of ratio control is controller is proportional to deviation, has corresponding relation between the size of work output and deviation.When load variations, immunity from interference is strong, and transit time is short, but process ends, existence is remaining poor. Therefore it is applicable to control the system that delayed less, the load variations of passage is little, allow controlled amount to change within the specific limits. Should also be noted that during use and need to eliminate progressive error through after a period of time.
(3) proportional plus integral control (PI control)
Due to the feature of proportional plus integral control be the output of controller and deviation be integrated into ratio, at the end of the effect of integration makes transient process, nothing left is poor, but the stability of system reduces. Stability can be made to improve although strengthening proportional band, but transit time is lengthened. Therefore, PI control be applicable to delayed less, load variations is little, controlled amount does not allow to have a surplus poor Controlling System, it uses a kind of maximum, most widely used control method in engineering.
(4) proportional integral adds differential control (PID control)
It is that the effect of differential makes the output of controller be directly proportional to the speed of change of error example that proportional integral adds the feature of differential control, and the capacity lag overcoming object is had significant effect by it. Ratio basis adds the differential action, stability is improved, adds integral action, it is possible to it is remaining poor to eliminate. Therefore, PID control is applicable to the Controlling System that load variations is big, capacity lag is relatively big, Control platform requirement is very high again.
In sum, pid control mode is that water temperature control system provides a kind of new solution.
Practical novel content
The purpose of this utility model is to overcome deficiency of the prior art, it is provided that a kind of water temperature control system, solves the technical problem that water temperature control tolerance range and stabilizing effect in prior art are poor.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of water temperature control system, comprising:
Temperature detecting module, for real-time detection practical water temperature;
Data processing module, for carrying out digital-to-analog conversion process by actual water temperature data;
Input through keyboard module, for user interactions Offered target water temperature;
Display module, for showing actual water temperature and target water temperature;
Lower level controller, for by actual water temperature and target water temperature data upload to host controller;
Communication module, for the communication realized between lower level controller and host controller;
Host controller, for going out control signal according to the differential thermal calculation of actual water temperature and target water temperature;
Switch module, for being converted to the make-and-break signal of control heating module by control signal;
Heating module, for heating water temperature.
Further, described host controller, according to the temperature difference of actual water temperature and target water temperature, adopts the PWM control mode based on pid algorithm control to calculate control signal.
Further, described data processing module comprises amplification circuit and analog to digital conversion circuit.
Further, described amplification circuit adopts LM234 chip, comprises one-level and penetrates a grade follower amplifier, two grades of anti-phase ratio summation amplifiers and three grades of anti-phase scale amplifying discharge circuits.
Further, analog-digital conversion circuit as described adopts ADC0804 chip.
Further, described lower level controller adopts the micro-chip of AT89C2051 series, and host controller adopts the micro-chip of AT89C51 series.
Further, described communication module is RS232 interface communication.
Further, described temperature detecting module adopts the temperature sensor of AD590 series.
Further, described switch module comprises Bidirectional thyristor relay switch.
Further, described display module is numeral method screen.
Further, described host controller also comprises serial communication module, for being connected with computer.
Compared with prior art, the utility model reachesUseful effectIt is:
1, host controller is according to the temperature difference of actual water temperature and target water temperature, adopt and combine based on pid algorithm control and PWM control mode, then by the break-make of switch module control electric furnace, thus change the realization of water temp. heating time to the accurate control of water temperature, response can be realized rapider, good stability, energy consumption is few.
2, adopting input through keyboard, numeral method screen display is shown, it is possible to while realizing observed temperature, it is also possible to realizes the setting to temperature, facilitates user to observe and operate.
3, microprocessor control module adopts the micro-chip of AT89C2051, AT89C51 series, has that processing power is strong, low-power consumption feature, it is possible to energy efficient.
4, the signal that temperature sensor gathers is through amplifying amplifier process and analog-to-digital conversion process, it is possible to identifies and distinguishes small semaphore, it is to increase the control tolerance range of water temperature, makes relative error less, and tolerance range is higher.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described. Following examples are only for clearly illustrating the technical solution of the utility model, and can not limit protection domain of the present utility model with this.
As shown in Figure 1, a kind of water temperature control system, comprising: temperature detecting module, for real-time detection practical water temperature; Data processing module, for carrying out digital-to-analog conversion process by actual water temperature data; Input through keyboard module, for user interactions Offered target water temperature; Display module, for showing actual water temperature and target water temperature; Lower level controller, for by actual water temperature and target water temperature data upload to host controller; Communication module, for the communication realized between lower level controller and host controller; Host controller, for going out control signal according to the differential thermal calculation of actual water temperature and target water temperature; Switch module, for being converted to the make-and-break signal of control heating module by control signal; Heating module, for heating water temperature.
Preferably, host controller is according to the temperature difference of actual water temperature and target water temperature, adopt and combine based on pid algorithm control and PWM control mode, then by the break-make of switch module control electric furnace, thus change the realization of water temp. heating time to the accurate control of water temperature, can realizing response more rapid, good stability, energy consumption is few.
Further, described data processing module comprises amplification circuit and analog to digital conversion circuit. Amplifying circuit and adopt LM234 chip, comprise one-level and penetrate a grade follower amplifier, two grades of anti-phase ratio summation amplifiers and three grades of anti-phase scale amplifying discharge circuits, analog to digital conversion circuit adopts ADC0804 chip, and inversion frequency is fast, precision height. Water temperature control system can identify distinguishes small semaphore, it is to increase the control tolerance range of water temperature, makes relative error less, and tolerance range is higher
Further, described lower level controller adopts the micro-chip of AT89C2051 series, and host controller adopts the micro-chip of AT89C51 series. AT89C2051, AT89C51 micro-chip is the most frequently used micro-chip, is a kind of low-loss, high-performance, CMOS eight bit microprocessor. The micro-chip of AT89C2051 and MCS-51 series is completely compatible on order set and pin, and can make the function that system has many MCS-51 series product and do not have, and function is strong, handiness height and cheap.Adopting the micro-chip of AT89C2051, AT89C51 series, water temperature control system is had, and processing power is strong, low-power consumption feature, it is possible to energy efficient.
Further, described communication module is RS232 interface communication.
Further, described temperature detecting module adopts the temperature sensor of AD590 series.
Further, described switch module comprises Bidirectional thyristor relay switch, and structure is simple, easy to operate.
Further, adopting input through keyboard, numeral method screen display is shown, it is possible to while realizing observed temperature, it is also possible to realizes the setting to temperature, facilitates user to observe and operate.
Further, host controller also comprises serial communication module, for being connected with computer.
Workflow of the present utility model is, temperature-measuring module adopts temperature sensor AD 590 Real-Time Monitoring water temperature, obtains real-time water temperature send to data processing module, amplifies through data processing module and is sent to lower level controller after analog to digital conversion; Input through keyboard module is for setting needing the target water temperature send reached to micro-chip; Display module adopts the target water temperature of the real-time water temperature of numeral method and setting; Real-time water temperature and target water temperature are uploaded to host controller by RS232 serial ports by lower level controller, host controller calculates water temperature difference according to real-time water temperature and target water temperature, adopt the PWM control method based on Adaptive PID Control, by switch module, heating module is carried out control to heat, namely control the break-make of electric furnace, thus change the water temp. heating time and make water temperature finally reach target water temperature. Host controller also comprises serial communication module, for being connected with computer.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also making some improvement and distortion, these improve and distortion also should be considered as protection domain of the present utility model.
Claims (10)
1. a water temperature control system, is characterized in that, comprising:
Temperature detecting module, for real-time detection practical water temperature;
Data processing module, for carrying out digital-to-analog conversion process by actual water temperature data;
Input through keyboard module, for user interactions Offered target water temperature;
Display module, for showing actual water temperature and target water temperature;
Lower level controller, for by actual water temperature and target water temperature data upload to host controller;
Communication module, for the communication realized between lower level controller and host controller;
Host controller, for going out control signal according to the differential thermal calculation of actual water temperature and target water temperature;
Switch module, for being converted to the make-and-break signal of control heating module by control signal;
Heating module, for heating water temperature.
2. a kind of water temperature control system according to claim 1, is characterized in that, described host controller, according to the temperature difference of actual water temperature and target water temperature, adopts the PWM control mode based on pid algorithm control to calculate control signal.
3. a kind of water temperature control system according to claim 1, is characterized in that, described data processing module comprises amplification circuit and analog to digital conversion circuit.
4. a kind of water temperature control system according to claim 3, is characterized in that, described amplification circuit adopts LM234 chip, comprises one-level and penetrates a grade follower amplifier, two grades of anti-phase ratio summation amplifiers and three grades of anti-phase scale amplifying discharge circuits.
5. a kind of water temperature control system according to claim 3, is characterized in that, analog-digital conversion circuit as described adopts ADC0804 chip.
6. a kind of water temperature control system according to claim 1, is characterized in that, described lower level controller adopts the micro-chip of AT89C2051 series, and host controller adopts the micro-chip of AT89C51 series.
7. a kind of water temperature control system according to claim 1, is characterized in that, described communication module is RS232 interface communication.
8. a kind of water temperature control system according to claim 1, is characterized in that, described temperature detecting module adopts the temperature sensor of AD590 series.
9. a kind of water temperature control system according to claim 1, is characterized in that, described switch module comprises Bidirectional thyristor relay switch.
10. a kind of water temperature control system according to claim 1, is characterized in that, described host controller also comprises serial communication module, for being connected with computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521109915.2U CN205318259U (en) | 2015-12-29 | 2015-12-29 | Water temperature control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521109915.2U CN205318259U (en) | 2015-12-29 | 2015-12-29 | Water temperature control system |
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| CN205318259U true CN205318259U (en) | 2016-06-15 |
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| CN201521109915.2U Expired - Fee Related CN205318259U (en) | 2015-12-29 | 2015-12-29 | Water temperature control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106339015A (en) * | 2016-11-08 | 2017-01-18 | 何春红 | Water temperature control system |
| CN107203236A (en) * | 2017-07-24 | 2017-09-26 | 河南迪天环保科技有限公司 | Temperature-control circuit |
-
2015
- 2015-12-29 CN CN201521109915.2U patent/CN205318259U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106339015A (en) * | 2016-11-08 | 2017-01-18 | 何春红 | Water temperature control system |
| CN107203236A (en) * | 2017-07-24 | 2017-09-26 | 河南迪天环保科技有限公司 | Temperature-control circuit |
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| 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: 20160615 Termination date: 20181229 |