CN103148594B - Direct-heating air energy water heater PID thermostatic control control system - Google Patents
Direct-heating air energy water heater PID thermostatic control control system Download PDFInfo
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- CN103148594B CN103148594B CN201310086056.9A CN201310086056A CN103148594B CN 103148594 B CN103148594 B CN 103148594B CN 201310086056 A CN201310086056 A CN 201310086056A CN 103148594 B CN103148594 B CN 103148594B
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Abstract
Disclosed direct-heating air energy water heater PID thermostatic control control system of the present invention, include main control system, show from machine and Valve controlling actuating unit, main control system adopts RS485 serial communication interface to be connected with display between machine, Valve controlling actuating unit includes the power driven system, stepper motor and the valve location check-out console that are connected successively by wire, main control system is connected with the power driven system in Valve controlling actuating unit by wire, and main control system is also connected with data storage cell by two-wire serial bus.Direct-heating air energy water heater PID thermostatic control control system of the present invention not only have control mode simple, easy for installation, not by the advantage of the impact in season and geographical position, and have outstanding contributions in energy-saving and environmental protection etc.
Description
Technical field
The invention belongs to water heater adjustment control apparatus technical field, relate to a kind of constant temperature of water heater regulation and control system, be specifically related to a kind of direct-heating air energy water heater PID thermostatic control control system.
Background technology
In recent years in China, air-source water heater industry development was comparatively rapid, along with 2010 " low-carbon economy " continue become popular, air energy industry has welcome a new development opportunity.With regard to overall condition, Opportunity coexists with challenge, along with the advertising war of air energy industry, price war, technological warfare are progressively upgraded, takes charge of scientific and technical innovation severely, grasps core technology, walks the developing direction that professional route has become air energy enterprise.
Along with the continuous acceleration of global warming situation, energy-saving and emission-reduction situation is increasingly severe.State's heater inside Market competition, wherein electric heater and gas heater steadily occupy water heater market, and in such a scenario, air-source water heater wants, and " three points of world " has a long way to go.According to statistics, current air-source water heater occupation rate commercially less than 5 percent, the cognition degree wretched insufficiency in market, and air can noble's price also allow certain customers hang back; Meanwhile, air-source water heater also relies on its good security and comfortableness deeply bad by inclining of some white collars personage.In a word, the potentiality of air-source water heater should not be underestimated.Under the environment of financial crisis, 2009 but there is the situation of growing up that reverses market tendency in air energy market, increase by 50% on a year-on-year basis, reach the scale of 1,500,000,000.
Relevant enterprise and researcher all have research to direct-heating air energy water heater both at home and abroad at present:
The MCS-51 series monolithic AT89S52 that the Chen Zhenhao of Shanghai Communications University selects atmel corp to produce is as master controller, signal amplifies and A/D modular converter is selected is 8 Approach by inchmeal modulus conversion chip TLC0838 of combination function of TI company production, the Low-Power CMOS real-time clock/calendar chip PCF8563 of the I2C EBI that its clock module selects Philips company to release; The HT1621 driving chip that the driver of section formula LCD selects cost performance very high, HT1621 is 128 pixels (32 × 4 sections), the multi-functional lcd driver of built-in video memory, its software configuration characteristic is highly suitable for the multiple LCD application comprising LCD pattern and display system, and only having 4 or 5 interfaces to be connected with main control singlechip, whole simple circuit is practical.
Zhejiang Polytechnical University appoints refined auspiciously High Performance SCM ADlxC812 and TG2401286V2 type LCDs to be organically combined, and designs the software and hardware system of heat pump heat supply generator set controller.Master's 12 A/D ALT-CH alternate channels of temperature value A/this single-chip microcomputer of D conversion complete, directly to sample to the voltage difference at PT100 sensor two ends, simplify the hardware circuit of controller; Utilize 74LS573 chip effectively to extend system port quantity, to meet, 12 way switch amounts export, IO way switch amount inputs and the needs of 8 key boards input.This system belongs to standalone architecture, and various function is selected and to be determined and Working state data is all shown by LCDs, all functions of system can be divided into several operational modules, clear in structure according to different display interfaces.
The Zhu Liangrong of Zhejiang Industry Polytechnic College with 87LPC767 and 87LPC762 chip for core, have devised controller of heat pump water heater, this controller adopts double mcu host-guest architecture, wherein main single-chip microcomputer system is responsible for the data acquisition of Teat pump boiler and operation of heat pump controls, from single-chip microcomputer, Teat pump boiler operational factor is set by man-machine interface system, and shows Teat pump boiler running status in real time; Carry out exchanges data by serial communication between principal and subordinate's single-chip microcomputer, this host-guest architecture will gather control task and man-machine interface task is separated, and can dispatch more efficiently and responding system real-time event, improves security performance; Temperature detection adopts 502AT type thermistor (temperature) sensor, and with temperature change, 502AT type thermistor change in resistance is comparatively large, and its output signal directly can send into the ADC pin of 87LPC767.
Along with socioeconomic development, the requirement that people have a bath to having a shower is more and more higher, and gas heater, electric heater, solar water heater etc. can not meet the needs of people to comfortable energy-saving safety.Air-source water heater has energy-efficient feature, and its energy-saving effect is 4 times of electric heater, is 3 times of gas heater, is about 2 times of solar water heater.The maximum feature of air-source water heater is electricity separation, without auxiliary electrical heater, provides against hidden trouble completely.But at cold district and when requiring high-temperature water outlet, it is very low that air-source water heater absorbs energy efficiency in air, it is very difficult therefore to carry out quick adjustment constant-temperature effluent.
Summary of the invention
The object of the present invention is to provide a kind of direct-heating air energy water heater PID thermostatic control control system, this system can not only reach user's design temperature and constant water outlet at the appointed time, the running status of motor and the working condition of temperature sensor can also be detected in real time, for water heater provides pre-, warning message accurately, guarantee water heater safe operation when controlled.
The technical solution adopted in the present invention is, direct-heating air energy water heater PID thermostatic control control system, include main control system, show from machine and Valve controlling actuating unit, main control system adopts RS485 serial communication interface to be connected with display between machine, Valve controlling actuating unit includes the power driven system, stepper motor and the valve location check-out console that are connected successively by wire, main control system is connected with the power driven system in Valve controlling actuating unit by wire, and main control system also passes through I
2c bus is connected with data storage cell.
Feature of the present invention is also,
Main control system, include main control unit a, PID control system is provided with in main control unit a, pid control algorithm is integrated with in PID control system, main control unit a is connected with signal acquiring system, signal output system respectively by wire, signal acquiring system is connected with temperature sensor monitors unit, valve location check-out console and external piloting control signal element respectively by wire, and main control unit a is also connected with house dog and power supply supervision unit, power module respectively by wire.
Temperature sensor monitors unit includes temperature sensor, temperature sensor is connected with inflow temperature monitoring modular, leaving water temperature monitoring modular, environment temperature monitoring modular and water tank temperature monitoring modular respectively by wire, and temperature sensor adopts digital temperature sensor DS18B20.
Be provided with change-over circuit in external piloting control signal element, change-over circuit is the two-way optocoupler of PC844, and power module adopts the powered operation mode of transformer or Switching Power Supply dual power supply.
The pid control algorithm arranged in PID control system (19) is:
Wherein MV
nfor exporting controlled quentity controlled variable, T
sPfor target temperature value, PV
nfor current T1 temperature, PV
n-1for previous T1 temperature, PV
n-PV
n-1for rate of temperature change,
for from 0 to n the summation of deviation, K
p, K
i, K
dbe respectively is ratio, integration, differential coefficient.
Display includes main control unit b from machine, and main control unit b is connected with key input unit, display unit, house dog and power supply supervision unit b respectively by I2C bus.
Main control unit a and main control unit b is AT89S52 microprocessor, and the chip of house dog and power supply supervision unit a, house dog and power supply supervision unit b all adopts DS1232 watchdog chip.
Key input unit adopts the stand-alone keypad of 1*3, and display unit includes ZLG7290 display chip and 4 Digital sum pipes.
Data storage cell is AT24C02 memory.
RS485 serial communication interface adopts MAX485 chip.
Beneficial effect of the present invention is,
(1) direct-heating air energy water heater PID thermostatic control control system of the present invention achieves air-source water heater fast and stable and reaches target temperature, after stable, variations in temperature fluctuation is little: when adopting PID control system to carry out temperature adjustment to water temperature, because water temperature rising hysteresis quality is large, valve constantly carries out pass valve, carry out valve opening after a period of time again when leaving water temperature exceedes target temperature day after the fair, easily cause overshoot; Not after kick-off valve, a large amount of cold water enters and leaving water temperature is declined rapidly, causes leaving water temperature great fluctuation process back and forth, takes valve opening technology first to make inflow fast approaching target temperature in the present invention.
(2) leaving water temperature of air-source water heater is increased to more than 70 degree by direct-heating air energy water heater PID thermostatic control control system of the present invention, can also effectively prevent overshoot of temperature excessive: the leaving water temperature of air-source water heater is generally all set between 50 DEG C ~ 60 DEG C, if higher than 60 DEG C and adopt PID regulate improper easily occur temperature rise slowly or temperature fluctuation excessive and cause occurring the problem of overshoot, therefore valve closed very little time the amplitude of accommodation control is just extremely important, temperature slope is taked to participate in the quick rising controlling to shift to an earlier date control temperature in the present invention.
(3) direct-heating air energy water heater PID thermostatic control control system of the present invention achieves the constant-temperature effluent of cold district: when the temperature is too low, absorb the very few of atmospheric heat, Valve controlling executing agency PID adjustable range will be smaller, and the present invention takes valve tracking technique to solve this problem.
(4) direct-heating air energy water heater PID thermostatic control control system of the present invention adapts to different regions and seasonal variations constant temperature goes out hot water, for different regions and season environment temperature differently with inflow temperature take different PID calculating parameters.
(5) direct-heating air energy water heater PID thermostatic control control system of the present invention takes interference protection measure to hardware and software simultaneously, ensure that system records signal accurately under the electromagnetic environment of complexity, in hardware design, not only achieve the shielding of complete machine height, high sealing, also there is good high temperature resistant, decay resistance; Adopt watchdog circuit and electrical grounding method, strengthen its interference free performance and the deadlock of effective anti-locking system; Software takes trap tech, Redundancy Design, filtering technique and automatically restoring fault technology, ensure that system in the presence of a harsh environment can steady operation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of direct-heating air energy water heater PID thermostatic control control system of the present invention;
Fig. 2 is the schematic diagram of main control system in direct-heating air energy water heater PID thermostatic control control system of the present invention;
The schematic diagram of the temperature sensor monitors unit in Fig. 3 direct-heating air energy water heater PID of the present invention thermostatic control control system in main control system;
Fig. 4 is the schematic diagram shown in direct-heating air energy water heater PID thermostatic control control system of the present invention from machine;
Fig. 5 is the workflow diagram of direct-heating air energy water heater PID thermostatic control control system of the present invention;
Fig. 6 is the control algolithm flow chart of PID control system in main control system in direct-heating air energy water heater PID thermostatic control control system of the present invention.
1. main control system, 2. display is from machine, 3. data storage cell, 4. power driven system, 5. stepper motor, 6. valve location check-out console, 7. main control unit a, 8. signal acquiring system, 9. signal output system, 10. temperature sensor monitors unit, 11. external piloting control signal elements, 12. house dogs and power supply supervision unit, 13. power modules, 14. temperature sensors, 15. main control unit b, 16. key input unit, 17. display units, 18. house dogs and power supply supervision unit b, 19.PID control system.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Direct-heating air energy water heater PID thermostatic control control system of the present invention, its structure as shown in Figure 1, include main control system 1, show from machine 2 and Valve controlling actuating unit, main control system 1 adopts RS485 serial communication interface to be connected with display between machine 2, Valve controlling actuating unit includes the power driven system 4, stepper motor 5 and the valve location check-out console 6 that are connected successively by wire, main control system 1 is connected with the power driven system 4 in Valve controlling actuating unit by wire, and main control system 1 also passes through I
2c bus is connected with data storage cell 3.
Main control system 1, its structure as shown in Figure 2, include main control unit a7, PID control system 19 is provided with in main control unit a7, pid control algorithm is integrated with in PID control system 19, main control unit a7 is connected with signal acquiring system 8, signal output system 9 respectively by wire, signal acquiring system 8 is connected with temperature sensor monitors unit 10, valve location check-out console 6, external piloting control signal element 11 respectively by wire, and main control unit a7 is also connected with house dog and power supply supervision unit 12, power module 13 respectively by wire.
Main control unit a7 is the core component of main control system 1, and it processes the data signal that temperature sensor monitors unit 10 is sent here, obtains the information of inflow temperature, leaving water temperature, water tank temperature and environment temperature; Main control unit a7 can also carry out cooperation control to the various functions of whole system.Main control unit a7 selects AT89S52 microprocessor, and it is a kind of low-voltage, high-performance CMOS 8-bit microprocessor of band 8K byte flicker programmable and erasable read-only storage (FPEROM-Flash Programmable and Erasable Read Only Memory).
Data storage cell 3 is for completing the storage of pid parameter and design temperature, still can protect data after power down, it adopts the eeprom memory AT24C02 of atmel corp's production.AT24C02 is the electric erasable storage chip of 2KB, adopts bus and the I of two-wire serial
2communicate between C bus and main control unit a7, voltage is minimum can arrive 2.5V, and rated current is 1mA, and quiescent current is 10uA(5.5V), the data in chip can preserve more than 40 years in the event of a power failure, and erase-write cycles reaches 1,000,000 times.
Temperature sensor monitors unit 10 includes temperature sensor 14, temperature sensor 14 is connected with inflow temperature monitoring modular, leaving water temperature monitoring modular, environment temperature monitoring modular and water tank temperature monitoring modular respectively by wire, temperature sensor 14 adopts digital temperature sensor DS18B20, it adopts monobus (1-wire) technology, address, data wire and control line are combined into the holding wire of a bidirectional linked list transmission, there is structure simple, be convenient to the advantage such as bus extension and maintenance.The temperature-measuring range of digital temperature sensor DS18B20 is-55 DEG C ~+125 DEG C, precision is 0.5 DEG C, the temperature value measured represents by 9 ~ 12 bit digital, maximum conversion time is 750ms, the upper limit value and lower limit value that temperature exceeding standard is reported to the police, the conversion resolution of digital temperature sensor DS18B20 all can be set by the user and can preserve for a long time.Utilize the monobus control protocol of Dallas and single wire control signal in bus, realize the read-write of data, each digital temperature sensor DS18B20 comprises unique 64 long sequence numbers, this sequence number value leaves the ROM(read-only memory of DS18B20 inside in) in, starting 8 is product type coding (DS1820 coding is 10H), then 48 is the unique sequence number of each device, and last 8 is the CRC(CRC of 56 above) code; Digital temperature sensor DS18B20 is inner primarily of temperature sensor, temperature digital change-over circuit, ROM memory, a temporary RAM, non-volatile electric erasable E2RAM, serial i/O interface circuit composition.
External piloting control signal element 11 input signal is external piloting control AC signal, and in order to be become+the 5V and the high and low level of 0V that main control unit a7 can accept and process, change-over circuit adopts the two-way optocoupler of PC844 of SHARP company.
The chip of house dog and power supply supervision unit a12 adopts the DS1232 watchdog chip of DALLAS company.DS1232 watchdog chip is used for carrying out power monitoring and control to main control system 1, and can be main control unit a7 provides reset signal, house dog supervision, reserve battery to automatically switch and power-fail supervision; Except powering on, under power loss condition for except main control unit a7 provides reset, also there is reserve battery handoff functionality, guarantee under power-down conditions, maintaining power supply to not allowing the device of power-off.
Power module 13 pairs of whole systems provide power supply, and PID thermostatic control control system of the present invention adopts the powered operation mode of transformer or Switching Power Supply dual power supply, namely has two kinds of powering modes: (1) transformer-supplied; (2) voltage-stabilized power supply is powered.Can according to the power supply mode of infield selective system, input voltage is 220V civil power, exports+12V export+5V to chip power supply with+9V ,+9V through power supply voltage stabilizing chip LM7805 through transformer or voltage-stabilized power supply two-way.The stability of the good bad influence whole system of electric power system performance.
RS485 serial communication interface adopts MAX485 chip to realize serial communication.The structure of MAX485 chip and pin are all very simple, inner containing a driver and receiver, adopt single power supply+5V work, rated current is 300uA, adopt half duplex communication mode, it completes function Transistor-Transistor Logic level being converted to RS485 level, and its driver Slew Rate is unrestricted, can realize the transfer rate of the highest 2.5Mbps.
Display is from machine 2, and its structure as shown in Figure 3, includes main control unit b15, and main control unit b15 is connected with key input unit 16, display unit 17, house dog and power supply supervision unit b18 respectively by I2C bus.Show the setting from the main completing user setting of machine 2 and inquiry temperature and four groups of pid parameters, show from 9V transmission supply from main control system 1 of the power supply of machine 2; Wherein, four groups of pid parameters refer to the P(scale parameter arranged for carrying out PID adjustment), I(integral parameter), D(differential parameter), need according to different environment temperatures and select different parameters.
Display adopts RS485 serial communication mode to be connected between the main control unit b15 in the machine 2 and main control unit a7 in main control system 1, and in order to mate baud rate, main control unit b15 also adopts AT89S52 microprocessor as central controller.
Key input unit 16 adopts the stand-alone keypad of 1*3.
Display unit 17 includes ZLG7290 chip and 4 Digital sum pipes.Display unit 20 selects the ZLG7290 chip of Guangzhou Zhou Ligong Company to drive 4 Digital sum pipes, this chip can complete the dynamic scan of 8 LED charactrons and maximum 64 buttons detection scannings automatically, significantly reduce the working time for display unit/key input unit and the program burden of main control unit b15, pooling of resources can be made for the detection and control of signal.Owing to adopting I2C bus mode to make the communication between chip and main control unit b15 only just can complete with 2 I/O mouths, save the mouth resource that main control unit b15 is limited.This chip is technical grade chip, and antijamming capability is strong, existing extensive application in industrial measurement and control.
Key input unit 16 and display unit 17 cooperatively interact in the process used, user can be inquired about by the button on key input unit 16 four temperature monitoring unit temperature, check and revise pid parameter; Wherein the temperature of four temperature monitoring unit monitorings refers to inflow temperature, leaving water temperature, environment temperature, water tank temperature respectively.
Watchdog chip in watch dog monitoring unit b18 also adopts the DS1232 chip of DALLAS company.
Main control system 1 and display adopt MAX485 chip from the RS485 serial communication modular between machine 2, realize main control system 1 and show from the serial communication between machine 2, and the structure of MAX485 chip and pin are all very simple, inner containing a driver and receiver.Adopt single power supply+5V work, rated current is 300uA, adopts half duplex communication mode.It completes function Transistor-Transistor Logic level being converted to RS485 level, and its driver Slew Rate is unrestricted, can realize the transfer rate of the highest 2.5Mbps.
The wide temperature that valve location check-out console 6 in Valve controlling actuating unit adopts Aleg MicroSystems company to produce, Hall switch effect sensor A3144E, its operating temperature range can reach-40 DEG C ~ 150 DEG C.It is made up of voltage-regulating circuit, inverting power supplies protection circuit, Hall element, temperature-compensation circuit, micro-signalamplifier, Schmidt trigger and OC door output stage, connects people CMOS logic circuit by using pull-up circuit to be exported.This chip has that size is little, good stability, sensitivity high.
In PID thermostatic control control system of the present invention, add pid control algorithm, because system controls flow of inlet water by by-pass valve control aperture, and then control water temperature, and the rising of water temperature and decline all need certain buffer time, so this system is a typical Large-lag System, add environment temperature, inflow temperature, the variable effect of hydraulic pressure, simple digital PID cannot meet the requirement of control.If directly-heated type PID thermostatic control control system of the present invention not optimize PID control algolithm, there are the following problems: (1) system requirements can arrive target temperature regime (TSP-1 DEG C ~ TSP+1 DEG C) at about 5 minutes, and simple digital PID regulation is slower, fluctuation is comparatively large, cannot meet this requirement; (2) traditional digital IIR filters overshoot of temperature is large, especially at temperature ascent stage, valve opening is now very little, close to closed positions, flow of inlet water is very little, and the energy that the cold-producing medium of HTHP contains cannot be taken away by cold water timely by heat exchange, causes the energy of high-temperature high-pressure refrigerant to be detained in compressor, cause overload of compressor, starting protection is shut down; (3) when compression mechanism heat is certain, under low temperature environment, temperature is difficult to reach setting target temperature, and valve can constantly to the direction motion turned down, can cause so again temperature overshoot or valve shut after still continue to turning down direction motion.
PID thermostatic control control system of the present invention is optimized pid control algorithm, makes whole regulation and control system reach following functions: the leaving water temperature of user's setting that what (1) made system quick and stable reach; (2) reduce and suppress the overshoot of leaving water temperature; (3) prevent valve from excessively turning down and cause overload of compressor to cause its protection to be shut down.
Pid control algorithm is wherein on the basis of conventional digital pid control algorithm, add valve opening setting first, temperature slope participation control and valve location tracing control, and the system of ensure that can stably reach the constant water outlet of user's design temperature in the short period of time.
In PID thermostatic control control system of the present invention, the pid control algorithm in PID control system is specifically implemented according to following algorithm:
MV in formula (1)
nfor exporting controlled quentity controlled variable, T
sPfor target temperature value, PV
nfor current T1 temperature, PV
n-1for previous T1 temperature, PV
n-PV
n-1for rate of temperature change,
for from 0 to n the summation of deviation, K
p, K
i, K
dbe respectively is ratio, integration, differential coefficient.
The course of work of PID thermostatic control control system of the present invention:
The transmission of temperature, pid parameter data is carried out in main control system 1 and display by RS485 serial communication mode from machine 2, the pid parameter set by key input unit 16 is reached main control system 1 by RS485 serial communication mode from machine 2 by display, data are stored in data storage cell 3 by main control system 1, so that carry out PID adjustment; When pressing the button on key input unit 16, showing and to obtain temperature information and each parameter of PID from machine 2 from main control system 1 and show.
As shown in Figure 5, the cold water entering air-source water heater exports hot water successively after control valve, heat pump condenser, the temperature of now actual hot water and leaving water temperature T
1with design temperature T
sPcompare, the situation according to reality selects pid parameter, is being optimized calculating, makes actual leaving water temperature T to regulate control valve through pid control algorithm
1with the temperature T of setting
sPconform to, shown in concrete adjustment process Fig. 6: 1) pre-set temperature T
sP, cold water exports hot water after control valve, heat pump condenser, the temperature of now actual hot water and leaving water temperature T
1with design temperature T
sPto compare, and by the change of the temperature sensor monitors unit 10 Real-Time Monitoring inflow temperature in main control system 1 and environment temperature, according to the different pid parameter of varying environment thermal creep stress and valve opening first; 2) utilize the pid control algorithm arranged in main control unit a7 to calculate, carry out valve regulated according to result of calculation: the temperature T set as temperature rate of rise >
sP, forbid valve regulated; Otherwise accumulated pulse number n=target valve aperture b, now forbids valve regulated; If accumulated pulse number n and target valve aperture b is inconsistent, then carry out valve regulated, so that control the water temperature T exported
1reach the temperature T of setting
sP.
Thus control valve controls executing agency 3, namely calculate value of feedback by pid algorithm and carry out controlling opening of valve, and then control flow of inlet water guarantee constant-temperature effluent; Show from machine 2 by RS485 serial communication mode and main control system 1 carry out communicating realize Temperature displaying, pid parameter function is set.
In order to make leaving water temperature reach setting value fast, in PID thermostatic control control system of the present invention, pid control algorithm is adopted to introduce valve opening first; Rising to prevent temperature causes overshoot of temperature large too soon, and this pid control algorithm introduces temperature slope and participates in controlling; Shut to prevent valve and cause the excessive generator protection that causes of pressure to be shut down, this pid control algorithm also introduces valve means of tracking; Add the detection and treatment scheme of electric motor protecting and temperature sensor short circuit and open circuit in addition, enable give the alarm in time and make safety operation during system malfunctions.Whole system not only have control mode simple, easy for installation, not by the advantage of the impact in season and geographical position, and have outstanding contributions in energy-saving and environmental protection etc.
Claims (1)
1. direct-heating air energy water heater PID thermostatic control control system, it is characterized in that, include main control system (1), display is from machine (2) and Valve controlling actuating unit, described main control system (1) adopts RS485 serial communication interface to be connected with described display between machine (2), described Valve controlling actuating unit includes the power driven system (4) connected successively by wire, stepper motor (5) and valve location check-out console (6), described main control system (1) is connected with the power driven system (4) in described Valve controlling actuating unit by wire, described main control system (1) also passes through I
2c bus is connected with data storage cell (3),
Described data storage cell (3) is AT24C02 memory; Described RS485 serial communication interface adopts MAX485 chip;
Described main control system (1) includes main control unit a (7), PID control system (19) is provided with in described main control unit a (7), pid control algorithm is integrated with in described PID control system (19), described main control unit a (7) is respectively by wire and signal acquiring system (8), signal output system (9) connects, described signal acquiring system (8) is respectively by wire and temperature sensor monitors unit (10), valve location check-out console (6) and external piloting control signal element (11) connect, described main control unit a (7) also by wire respectively with house dog and power supply supervision unit (12), power module (13) connects,
Described temperature sensor monitors unit (10) includes temperature sensor (14), described temperature sensor (14) is connected with inflow temperature monitoring modular, leaving water temperature monitoring modular, environment temperature monitoring modular and water tank temperature monitoring modular respectively by wire, and described temperature sensor (14) adopts digital temperature sensor DS18B20;
Be provided with change-over circuit in described external piloting control signal element (11), described change-over circuit is the two-way optocoupler of PC844, and described power module (13) adopts the powered operation mode of transformer or Switching Power Supply dual power supply;
The pid control algorithm arranged in described PID control system (19) is:
Wherein MV
nfor exporting controlled quentity controlled variable, T
sPfor target temperature value, PV
nfor current T1 temperature, PV
n-1for previous T1 temperature, PV
n-PV
n-1for rate of temperature change,
for from 0 to n the summation of deviation, K
p, K
i, K
dbe respectively is ratio, integration, differential coefficient;
Described display includes main control unit b (15) from machine (2), and described main control unit b (15) is connected with key input unit (16), display unit (17), house dog and power supply supervision unit b (18) respectively by I2C bus;
Described main control unit a (7) and main control unit b (15) are AT89S52 microprocessor, and the chip of described house dog and power supply supervision unit a (12), house dog and power supply supervision unit b (18) all adopts DS1232 watchdog chip;
Described key input unit (16) adopts the stand-alone keypad of 1*3, and described display unit (17) includes ZLG7290 display chip and 4 Digital sum pipes.
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| CN106839447A (en) * | 2017-03-14 | 2017-06-13 | 广东志高暖通设备股份有限公司 | A kind of hot water machine, water temperature control device and method |
| CN107037837A (en) * | 2017-05-16 | 2017-08-11 | 杭州国彪超声设备有限公司 | A kind of thermostatically-controlled equipment and control method applied to Ultrasonic Cell Disruptor |
| CN110274999A (en) * | 2019-07-19 | 2019-09-24 | 重庆科技学院 | Modified is bubbled sulfuric acid standard humidity generator and its variable data accurate calculation method |
| US11313588B2 (en) | 2019-09-20 | 2022-04-26 | Camus Hydronics Ltd. | System and method for controlling water heater output temperature |
| CN111336683B (en) * | 2020-03-10 | 2021-07-09 | 南通大学 | MPC-PID cascade control method for air source heat pump temperature control system |
| CN113705113B (en) * | 2021-10-27 | 2022-03-18 | 江苏大威新能源科技有限公司 | Heating performance evaluation method and system of solar water heater |
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| CN201803470U (en) * | 2010-08-07 | 2011-04-20 | 广东芬尼克兹节能设备有限公司 | Heat-pump water heater with proportional-integral-derivative (PID) control |
| CN201992837U (en) * | 2011-01-27 | 2011-09-28 | 河北保定太行集团有限责任公司 | Intelligent temperature controller |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60243432A (en) * | 1984-05-18 | 1985-12-03 | Osaka Gas Co Ltd | Room temperature control system for space heater |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201803470U (en) * | 2010-08-07 | 2011-04-20 | 广东芬尼克兹节能设备有限公司 | Heat-pump water heater with proportional-integral-derivative (PID) control |
| CN201992837U (en) * | 2011-01-27 | 2011-09-28 | 河北保定太行集团有限责任公司 | Intelligent temperature controller |
Non-Patent Citations (1)
| Title |
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| 基于87LPC767芯片的热泵热水器控制器研制;祝良荣;《电子科技》;20060715(第202期);75-79 * |
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