CN103148594A - PID thermostatic adjustment control system for directly-heated air energy water heater - Google Patents
PID thermostatic adjustment control system for directly-heated air energy water heater Download PDFInfo
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Abstract
The invention discloses a PID (Proportion Integration Differentiation) thermostatic adjustment control system for a directly-heated air energy heater, which comprises a control host, a display slave and a valve control execution device, wherein the control host is connected with the display slave by an RS485 (Recommended Standard 485) serial communication interface; the valve control execution device comprises a power drive system, a stepping motor and a valve position detection plate that are sequentially connected by wires; and the control host is connected with the power drive system in the valve control execution device by the wire, and further connected with a data storage unit by a two-wire serial bus. The PID thermostatic adjustment control system for the directly-heated air energy water heater has the advantages that the PID thermostatic adjustment control system is simple in control mode, convenient to mount, and free from season and geographical position influences. Furthermore, the PID thermostatic adjustment control system makes outstanding contributions to energy conservation, environmental protection and the like.
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 China, the air-source water heater industry development was comparatively rapid in recent years, be accompanied by 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 advertising war, price war, the technological warfare of air energy industry 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, the energy-saving and emission-reduction situation is increasingly severe.State's heater inside Market competition, wherein electric heater and gas heater have steadily occupied water heater market, and under this sight, air-source water heater wants " three minutes are all over the world " and has a long way to go.According to statistics, the current occupation rate less than percent five of air-source water heater on market, the cognition degree wretched insufficiency in market, and noble's price of air energy also allows certain customers hang back; Meanwhile, air-source water heater also relies on its good security and comfortableness deeply to be subject to inclining of some white collar personages bad.In a word, the potentiality of air-source water heater should not be underestimated.Under the environment of financial crisis, within 2009, the situation that reverses market tendency and grow up has but appearred in air energy market, increases by 50% on a year-on-year basis, has reached 1,500,000,000 scale.
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 the A/D modular converter is selected be TI company produce successively approach modulus conversion chip TLC0838 in conjunction with 8 of both functions, its clock module is selected the Low-Power CMOS real-time clock/calendar chip PCF8563 of the I2C EBI of Philips company release; The driver of section formula LCD selects the HT1621 that cost performance is very high to drive chip, 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 comprising the multiple LCD application of LCD pattern and display system, and only have 4 or 5 interfaces to be connected with main control singlechip, whole simple circuit practicality.
Zhejiang Polytechnical University appoints refined auspicious in High Performance SCM ADlxC812 and the combination of TG2401286V2 type LCDs, designs the software and hardware system of heat pump heat supply generator set controller.12 A/D ALT-CH alternate channels of master of temperature value A/this single-chip microcomputer of D conversion using complete, in order to directly the voltage difference at PT100 sensor two ends is sampled, have simplified the hardware circuit of controller; Utilize the 74LS573 chip effectively to expand system port quantity, to meet the needs of 12 way switch amount outputs, the input of IO way switch amount and the input of 8 key boards.This system belongs to the unit structure, and various functions are selected and determined and Working state data is all to be shown by LCDs, according to different display interfaces, all functions of system can be divided into to several operational modules, clear in structure.
It is core that the Zhu Liangrong of Zhejiang Industry Polytechnic College be take 87LPC767 and 87LPC762 chip, designed controller of heat pump water heater, this controller adopts the double mcu host-guest architecture, wherein main single-chip microcomputer system is responsible for data acquisition and the operation of heat pump control of Teat pump boiler, by man-machine interface system, the Teat pump boiler operational factor is set from single-chip microcomputer, and shows in real time the Teat pump boiler running status; Carry out exchanges data by serial communication between principal and subordinate's single-chip microcomputer, this host-guest architecture will gather control task and the man-machine interface task is separated, and can dispatch more efficiently and the 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 larger, and its output signal can directly be sent 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 characteristics, and its energy-saving effect is 4 times of electric heater, is 3 times of gas heater, is approximately 2 times of solar water heater.The maximum characteristics of air-source water heater are electricity separation, without auxiliary electrical heater, provide against hidden trouble fully.Yet in the situation that cold district and require high-temperature water outlet, it is very low that air-source water heater absorbs in air energy efficiency, therefore carry out the quick adjustment constant-temperature effluent very difficult.
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 constant water outlet at the appointed time, can also detect in real time the running status of motor and the working condition of temperature sensor, for water heater provides pre-, warning message accurately, guarantee water heater in the situation that controlled safe operation.
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 slave and valve control actuating unit, main control system adopts the RS485 serial communication interface to be connected with showing between slave, valve is controlled actuating unit and is included power driven system, stepper motor and the valve location check-out console connected successively by wire, main control system is connected with the power driven system in valve is controlled actuating unit by wire, and main control system also passes through I
2the C bus is connected with data storage cell.
Characteristics of the present invention also are,
Main control system, include main control unit a, be provided with the PID control system in main control unit a, be integrated with pid control algorithm in the PID control system, main control unit a is connected with signal acquiring system, signal output system by wire respectively, signal acquiring system is connected with temperature sensor monitors unit, valve location check-out console and external piloting control signal element by wire respectively, and main control unit a also is connected with power supply supervision unit, power module with house dog respectively by wire.
The 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 by wire respectively, 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:
MV wherein
nfor output controlled quentity controlled variable, T
sPfor target temperature value, PV
nfor current T1 temperature, PV
n-1for T1 temperature last time, PV
n-PV
n-1for rate of temperature change,
for the summation of the deviation from 0 to n, K
p, K
i, K
dbe respectively is ratio, integration, differential coefficient.
Show that slave includes main control unit b, main control unit b is connected with keyboard input block, display unit, house dog and power supply supervision unit b by the I2C bus respectively.
Main control unit a and main control unit b are the AT89S52 microprocessor, and the chip of house dog and power supply supervision unit a, house dog and power supply supervision unit b all adopts the DS1232 watchdog chip.
The keyboard input block adopts the stand-alone keypad of 1*3, and display unit includes ZLG7290 display chip and 4 charactrons.
Data storage cell is the AT24C02 memory.
The RS485 serial communication interface adopts the 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 has realized that the air-source water heater fast and stable reaches target temperature, after stable, the variations in temperature fluctuation is little: while adopting the PID control system to carry out adjustment to water temperature, because water temperature rising hysteresis quality is large, valve is constantly closed valve, driven again valve after a period of time when leaving water temperature surpasses target temperature day after the fair, easily caused overshoot; , after kick-off valve, a large amount of cold water does not enter leaving water temperature is descended rapidly, causes leaving water temperature great fluctuation process back and forth, in the present invention, takes valve opening technology first to make inflow fast approaching target temperature.
(2) more than direct-heating air energy water heater PID thermostatic control control system of the present invention is increased to 70 degree by the leaving water temperature of air-source water heater, can also effectively prevent that overshoot of temperature is excessive: the leaving water temperature of air-source water heater generally all is set between 50 ℃～60 ℃, if higher than 60 ℃ and adopt PID to regulate improperly to be prone to that temperature rises slowly or temperature fluctuation is excessive and to cause occurring the problem of overshoot, therefore at valve, closed very little the time amplitude of accommodation just extremely important control, in the present invention, take temperature slope to participate in controlling the fast rise of controlling in advance temperature.
(3) direct-heating air energy water heater PID thermostatic control control system of the present invention has realized the constant-temperature effluent of cold district: when temperature is too low, absorb the very few of air heat, valve is controlled the PID of executing agency adjustable range will be smaller, and the present invention takes the 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 is taked interference protection measure to hardware and software simultaneously, the system that guaranteed records signal accurately under complicated electromagnetic environment, not only on hardware design, realize the high shielding of complete machine, high sealing, also there is good high temperature resistant, decay resistance; Adopt watchdog circuit and electrical grounding method, strengthen the deadlock of its interference free performance effectively anti-locking system; Software has been taked trap tech, Redundancy Design, filtering technique and automatically restoring fault technology, and the system that guaranteed can steady operation under adverse circumstances.
The 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 shows the schematic diagram of slave in direct-heating air energy water heater PID thermostatic control control system of the present invention;
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 the interior PID control system of main control system in direct-heating air energy water heater PID thermostatic control control system of the present invention.
1. main control system, 2. show slave, 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 element, 12. house dogs and power supply supervision unit, 13. power modules, 14. temperature sensor, 15. main control unit b, 16. keyboard input blocks, 17. display unit, 18. house dogs and power supply supervision unit b, 19.PID control system.
The specific embodiment
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 slave 2 and valve control actuating unit, main control system 1 adopts the RS485 serial communication interface to be connected with showing between slave 2, valve is controlled actuating unit and is included power driven system 4, stepper motor 5 and the valve location check-out console 6 connected successively by wire, main control system 1 is connected with the power driven system 4 in valve is controlled actuating unit by wire, and main control system 1 also passes through I
2the C bus is connected with data storage cell 3.
Main control system 1, its structure as shown in Figure 2, include main control unit a7, be provided with PID control system 19 in main control unit a7, be integrated with pid control algorithm in PID control system 19, main control unit a7 is connected with signal acquiring system 8, signal output system 9 by wire respectively, signal acquiring system 8 is connected with temperature sensor monitors unit 10, valve location check-out console 6, external piloting control signal element 11 by wire respectively, and main control unit a7 also is connected with power supply supervision unit 12, power module 13 with house dog respectively by wire.
Main control unit a7 is the core component of main control system 1, and the data signal that it is sent here temperature sensor monitors unit 10 is processed, and obtains the information of inflow temperature, leaving water temperature, water tank temperature and environment temperature; Main control unit a7 can also coordinate to control to the various functions of whole system.Main control unit a7 selects the AT89S52 microprocessor, and it is low-voltage, the high-performance CMOS 8-bit microprocessor of a kind of band 8K byte flicker programmable and erasable read-only storage (FPEROM-Flash Programmable and Erasable Read Only Memory).
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 by wire respectively, temperature sensor 14 adopts digital temperature sensor DS18B20, it adopts monobus (1-wire) technology, address, data wire and control line are combined into to the holding wire of a bidirectional linked list transmission, have simple in structurely, be convenient to the advantages such as bus expansion and maintenance.The temperature-measuring range of digital temperature sensor DS18B20 is-55 ℃～+ 125 ℃, precision is 0.5 ℃, the temperature value of measuring means by 9～12 bit digital, be 750ms maximum conversion time, 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 long preservation.Utilize the monobus control protocol of Dallas and the read-write that the single line control signal realizes data on bus, each digital temperature sensor DS18B20 comprises 64 unique long sequence numbers, this sequence number value leaves the ROM(read-only memory of DS18B20 inside in) in, starting 8 is product type coding (the DS1820 coding is 10H), then 48 are the unique sequence numbers of each device, and last 8 is the CRC(CRC of 56 of fronts) code; The digital temperature sensor DS18B20 internal main will be by temperature sensor, temperature digital change-over circuit, ROM memory, a temporary RAM, non-volatile electric erasable E2RAM, and serial i/O interface circuit forms.
External piloting control signal element 11 input signals are the external piloting control AC signal, for it is become to main control unit a7 can accept and process+5V and the high and low level of 0V, 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.The DS1232 watchdog chip is 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 automatic switchover and power-fail to monitor; For main control unit a7 provides and reset, also there is the reserve battery handoff functionality except powering on, under power loss condition, guarantee under power-down conditions, to the device that does not allow outage, maintain power supply.
13 pairs of whole systems of power module 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, two kinds of powering modes is arranged: (1) transformer-supplied; (2) voltage-stabilized power supply power supply.Can be according to the power supply mode of infield selective system, input voltage is the 220V civil power, through transformer or voltage-stabilized power supply two-way output+12V and+9V ,+9V passes through power supply voltage stabilizing chip LM7805 output+5V to chip power supply.The stability of the good bad influence whole system of electric power system performance.
The RS485 serial communication interface adopts the MAX485 chip to realize serial communication.The structure of MAX485 chip and pin are all very simple, a driver and receiver are contained in inside, adopt single power supply+5V work, rated current is 300uA, adopt the half duplex communication mode, it completes the function that Transistor-Transistor Logic level is converted to the RS485 level, and its driver Slew Rate is unrestricted, can realize the transfer rate of the highest 2.5Mbps.
Show between the interior main control unit b15 of the slave 2 main control unit a7 interior with main control system 1 and adopt RS485 serial communication mode to be connected, in order to mate baud rate, main control unit b15 also adopts the AT89S52 microprocessor as central controller.
Watchdog chip in watch dog monitoring unit b18 also adopts the DS1232 chip of DALLAS company.
RS485 serial communication modular between main control system 1 and demonstration slave 2 adopts the MAX485 chip, realizes main control system 1 and shows the serial communication between slave 2, and the structure of MAX485 chip and pin are all very simple, and a driver and receiver are contained in inside.Adopt single power supply+5V work, rated current is 300uA, adopts the half duplex communication mode.It completes the function that Transistor-Transistor Logic level is converted to the RS485 level, and its driver Slew Rate is unrestricted, can realize the transfer rate of the highest 2.5Mbps.
Valve is controlled wide temperature, the Hall switch effect sensor A3144E that the valve location check-out console 6 in actuating unit adopts Aleg MicroSystems company to produce, and its operating temperature range can reach-40 ℃～150 ℃.It consists of voltage-regulating circuit, inverting power supplies holding circuit, Hall element, temperature-compensation circuit, micro-signal amplifier, Schmidt trigger and OC door output stage, by using pull-up circuit, its output can be connect to people CMOS logic circuit.This chip has the characteristics such as size is little, good stability, sensitivity height.
In PID thermostatic control control system of the present invention, added pid control algorithm, because system is to control flow of inlet water by the by-pass valve control aperture, and then the 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 can't meet the requirement of control.If directly-heated type PID thermostatic control control system of the present invention not the optimize PID control algolithm there are the following problems: (1) system requirements can arrive target temperature zone (TSP-1 ℃～TSP+1 ℃) about 5 minutes, and simple digital PID regulation is slower, fluctuate larger, can't meet this requirement; (2) traditional digital PID control overshoot of temperature is large, especially at the temperature ascent stage, valve opening now is very little, approached the complete shut-down position, flow of inlet water is very little, and the energy that the cold-producing medium of HTHP contains can't 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) in the situation that the compression mechanism heat is certain, under low temperature environment, temperature is difficult to reach the target setting temperature, and valve can, constantly to the direction motion turned down, can cause so again temperature overshoot or valve to shut and still continue afterwards to the direction motion turned down.
PID thermostatic control control system of the present invention is optimized pid control algorithm, makes whole regulation and control system can reach following functions: (1) allow system quick and stable reach the leaving water temperature that the user sets; (2) reduce and suppress the overshoot of leaving water temperature; (3) prevent that valve from excessively turning down and causing overload of compressor to cause its protection to be shut down.
Pid control algorithm wherein is on the basis of conventional digital pid control algorithm, to have added valve opening setting first, temperature slope to participate in controlling and valve location tracking control, and the system that guaranteed 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 the PID control system is specifically implemented according to following algorithm:
MV in formula (1)
nfor output controlled quentity controlled variable, T
sPfor target temperature value, PV
nfor current T1 temperature, PV
n-1for T1 temperature last time, PV
n-PV
n-1for rate of temperature change,
for the summation of the deviation from 0 to n, 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:
Main control system 1 and demonstration slave 2 carry out the transmission of temperature, pid parameter data by RS485 serial communication mode, show that the pid parameter that slave 2 will set by keyboard input block 16 reaches main control system 1 by RS485 serial communication mode, main control system 1 is stored in data in data storage cell 3, so that carry out the PID adjusting; During button on pressing lower keyboard input block 16, show that slave 2 obtains temperature information and each parameter of PID and shows from main control system 1.
As shown in Figure 5, the cold water that enters air-source water heater is exported hot water successively after control valve, heat pump condenser, and now the temperature of actual hot water is leaving water temperature T
1with design temperature T
sPcompare, according to actual situation, select pid parameter, through pid control algorithm, be optimized calculating, to regulate control valve, make actual leaving water temperature T
1with the temperature T of setting
sPconform to, shown in concrete adjustment process Fig. 6: 1) pre-set temperature T
sP, cold water is exported hot water after control valve, heat pump condenser, and now the temperature of actual hot water is leaving water temperature T
1with design temperature T
sPcompare, and by the temperature sensor monitors unit 10 Real-Time Monitoring inflow temperatures in main control system 1 and the variation of environment temperature, according to the varying environment temperature, select different pid parameters and valve opening first; 2) utilize the pid control algorithm arranged in main control unit a7 to be calculated, carry out valve regulated according to result of calculation: when the temperature rate of rise temperature T set
sP, forbid valve regulated; Otherwise accumulative total pulse number n=target valve aperture b, now forbid valve regulated; If accumulative total pulse number n and target valve aperture b are inconsistent, carry out valve regulated, so that control the water temperature T of output
1reach the temperature T of setting
sP.
Thereby control valve is controlled executing agency 3, by pid algorithm, calculates value of feedback and carrys out controlling opening of valve, and then control flow of inlet water assurance constant-temperature effluent; Show that slave 2 communicates the function that arranges that realizes temperature demonstration, pid parameter by RS485 serial communication mode and main control system 1.
In order to make leaving water temperature reach fast setting value, in PID thermostatic control control system of the present invention, adopt pid control algorithm to introduce valve opening first; In order to prevent that temperature from rising, cause too soon overshoot of temperature large, this pid control algorithm has been introduced temperature slope and has been participated in controlling; In order to prevent that valve from shutting, cause the excessive generator protection that causes of pressure to be shut down, this pid control algorithm has also been introduced the valve means of tracking; Added in addition electric motor protecting and temperature sensor short circuit and the detection of opening circuit and processing scheme, when system is broken down, can give the alarm in time and make safety operation.Whole system not only has advantages of that control mode is simple, easy for installation, be not subject to the impact in season and geographical position, and at aspects such as energy-saving and environmental protection, outstanding contributions is arranged.
Claims (10)
1. direct-heating air energy water heater PID thermostatic control control system, it is characterized in that, include main control system (1), show slave (2) and valve control actuating unit, between described main control system (1) and described demonstration slave (2), adopt the RS485 serial communication interface to be connected, described valve is controlled actuating unit and is included 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 is controlled actuating unit by wire, described main control system (1) also passes through I
2the C bus is connected with data storage cell (3).
2. direct-heating air energy water heater PID thermostatic control control system according to claim 1, it is characterized in that, described main control system (1) includes main control unit a(7), described main control unit a(7) be provided with PID control system (19) in, be integrated with pid control algorithm in described PID control system (19), described main control unit a(7) 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.
3. direct-heating air energy water heater PID thermostatic control control system according to claim 2, it is characterized in that, 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 by wire respectively, and described temperature sensor (14) adopts digital temperature sensor DS18B20.
4. direct-heating air energy water heater PID thermostatic control control system according to claim 2, it is characterized in that, 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.
5. direct-heating air energy water heater PID thermostatic control control system according to claim 2, is characterized in that, the pid control algorithm arranged in described PID control system (19) is:
MV wherein
nfor output controlled quentity controlled variable, T
sPfor target temperature value, PV
nfor current T1 temperature, PV
n-1for T1 temperature last time, PV
n-PV
n-1for rate of temperature change,
for the summation of the deviation from 0 to n, K
p, K
i, K
dbe respectively is ratio, integration, differential coefficient.
6. direct-heating air energy water heater PID thermostatic control control system according to claim 1, it is characterized in that, described demonstration slave (2) includes main control unit b(15), described main control unit b(15) respectively by I2C bus and keyboard input block (16), display unit (17), house dog and power supply supervision unit b(18) be connected.
7. according to the described direct-heating air energy water heater PID of claim 2 or 6 thermostatic control control system, it is characterized in that, described main control unit a(7) and main control unit b(15) be AT89S52 microprocessor, described house dog and power supply supervision unit a(12), house dog and power supply supervision unit b(18) chip all adopt the DS1232 watchdog chip.
8. direct-heating air energy water heater PID thermostatic control control system according to claim 6, it is characterized in that, described keyboard input block (16) adopts the stand-alone keypad of 1*3, and described display unit (17) includes ZLG7290 display chip and 4 charactrons.
9. direct-heating air energy water heater PID thermostatic control control system according to claim 1, is characterized in that, described data storage cell (3) is the AT24C02 memory.
10. direct-heating air energy water heater PID thermostatic control control system according to claim 1, is characterized in that, described RS485 serial communication interface adopts the MAX485 chip.
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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 |
| 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 |
| CN113705113A (en) * | 2021-10-27 | 2021-11-26 | 江苏大威新能源科技有限公司 | Heating performance evaluation method and system of solar water heater |
| US11313588B2 (en) | 2019-09-20 | 2022-04-26 | Camus Hydronics Ltd. | System and method for controlling water heater output temperature |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113705113A (en) * | 2021-10-27 | 2021-11-26 | 江苏大威新能源科技有限公司 | Heating performance evaluation method and system of solar water heater |
| 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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| Publication number | Publication date |
|---|---|
| CN103148594B (en) | 2015-09-09 |
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