CN102589094A - Staged synchronous compressor and expansion valve control method for thermostatic and humidistatic air conditioning unit - Google Patents
Staged synchronous compressor and expansion valve control method for thermostatic and humidistatic air conditioning unit Download PDFInfo
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Abstract
The invention relates to a staged synchronous compressor and expansion valve control method for a thermostatic and humidistatic air conditioning unit. The control method includes the steps: dividing system control into a coarse control stage and a fine control stage according to the starting state and the normal running state of the air conditioning unit, performing preset open-loop control at the coarse control stage by increasing the frequency of the compressor at the speed of 3Hz/s to the highest frequency for the compressor to run and setting the openness of the electronic expansion valve to reach 50%-70%; and performing synchronous compressor and expansion valve closed-loop control at the fine control stage by performing adaptive PID (proportion integration differentiation) adjustment according to inputted indoor and outdoor temperature and humidity change and change rate, superheat degree and superheat degree change rate, outputting frequency signals of the compressor and openness signals of the expansion valve, and controlling the rotation speed of the compressor and the opening pulse of the expansion valve to realize synchronous control. The time of temperature and humidity fluctuation of a controlled environment at the starting stage of the thermostatic and humidistatic air conditioning unit or due to external interference with the thermostatic and humidistatic air conditioning unit can be greatly shortened, and delay and over-control of the system control due to respectively independent control for the compressor and the expansion valve are relieved.
Description
Technical field
The invention belongs to the air conditioner controlling technology field, especially a kind of compressor stage by stage-expansion valve synchronisation control means that applies to thermostatic and humidistatic air conditioning unit can be realized thermostatic and humidistatic air conditioning unit humiture High Accuracy Control.
Background technology
Present stage; Thermostatic and humidistatic air conditioning unit is mainly realized through dual mode for the accurate control that controls environment: the one, through regulating the accurately control required refrigerating capacity (moisture removal) of exerting oneself of compressor; Reach constant humiture high-precision requirement, this often needs the adjustable compressors of capacity such as frequency conversion or digital vortex; The 2nd, utilize controllable silicon PID to regulate and add heat and humidification amount, thereby accurately regulated refrigerating capacity and crossed moisture removal, reach the adjusting purpose of constant temperature and humidity.Under the overall situation of energy-saving and emission-reduction, the drawback that the latter costs an arm and a leg because of controllable silicon and can't solve cold and hot amount counteracting and energy waste, thereby be unfavorable for generally promoting; And preceding kind of method can effectively be alleviated the cold and hot amount counteracting that asynchronism caused because of Temperature and Humidity Control, and the adjustable characteristics of compressor capacity can accurately be controlled indoor temperature and humidity simultaneously, and this also is the developing direction of high-accuracy and constant constant temperature and humidity air conditioner energy-saving technology.
In frequency conversion or the control of digital vortex constant temperature and humidity air-conditioning system; Present control mode is considered the control of electric expansion valve and compressor often isolatedly; Be easy to produce hysteresis or over control, it is collaborative often to make compressor and electric expansion valve can not reach coupling at short notice, though long-time system can tend towards stability; But air conditioner surroundings changeable often, complicated; In case change, need the long period that system is tended towards stability again, certainly will be difficult to like this guarantee that whole refrigeration system operates in optimum state all the time.
Summary of the invention
The present invention; Be intended to alleviate delay and the over control that thermostatic and humidistatic air conditioning unit occurs when carrying out the Temperature and Humidity Control operation; Improve control accuracy, reliability and the energy saving of thermostatic and humidistatic air conditioning unit; Propose a kind of compressor stage by stage-expansion valve synchronous control mode that can be adapted to the thermostatic and humidistatic air conditioning unit of compressor variable capacity (frequency conversion or digital vortex), and combine traditional self-adaptive PID technology, realize thermostatic and humidistatic air conditioning unit humiture High Accuracy Control.
The present invention; The Synchronization Control scheme of the compressor-expansion valve of being stated has been broken the mode that conventional inverter air conditioner electric expansion valve and compressor are independently controlled; Indoor temperature and humidity is controlled the frequency of compressor and the relatively independent control of aperture of degree of superheat control electric expansion valve; The respective function relation of the operating frequency through setting up compressor and the aperture of electric expansion valve organically combines, and realizes compressor and expansion valve Synchronization Control.The specific embodiment is: the frequency of compressor and the aperture of electric expansion valve all are to be realized as the control target by the degree of superheat and indoor temperature, humidity, and meanwhile, the respective function of aperture that need set up operating frequency and the electric expansion valve of compressor concerns.Specifically, the aperture of electric expansion valve also needs return air temperature, humidity to control not only according to the outlet degree of superheat of evaporimeter.On the one hand, convert the degree of superheat and indoor temperature, humidity to through converter the aperture signal of electric expansion valve; On the other hand, convert the aperture signal of electric expansion valve the frequency signal of compressor to, the rotating speed of control compressor is realized the Synchronization Control of compressor and electric expansion valve reducing to cause because of the variation of operating mode the vibration of system's operation generation.
The present invention; Said thermostatic and humidistatic air conditioning unit comprises frequency-changeable compressor, outdoor condenser, electric expansion valve, evaporimeter, electric heater and electrode humidifier, and cold-producing medium is through frequency-changeable compressor, after the cold-producing medium of the HTHP that is come out by compressor gets into the condenser heat release; Throttling is depressurized in the evaporimeter through electric expansion valve; The cold-producing medium of low-temp low-pressure returns compressor after the evaporimeter heat absorption, and then realizes the refrigeration system circulation; The return air of controlled high ambient temperature high humidity through behind heater and humidifier fine setting heating and the humidification, is sent into controlled environment behind the evaporimeter cool-down dehumidification, keeping the humiture requirement of environment, and then the realization supply air system circulates.
The present invention, said control method is to start and normally moving under the two states according to thermostatic and humidistatic air conditioning unit, controls system to be divided into coarse adjustment control stage and fine tuning control stage; The Different control stage is adopted the Different control method; In the coarse adjustment stage, the subject matter that solve is the difference of dwindling as early as possible between indoor temperature, humidity and the target setting, in the coarse adjustment stage; System is in a unsettled running; The accurate control degree of superheat compares difficulty often, and the control method in the coarse adjustment stage adopts given in advance adjusted open loop: compressor is with speed rising operation under highest frequency of 3Hz/s, and the aperture of electric expansion valve is set at 50%-70%; In the fine tuning stage, room temperature humidity and target setting difference are less, and the main target of control is that the degree of superheat of as far as possible keeping cold-producing medium fluctuates in more among a small circle; And as far as possible near the target setting value, remain best liquid supply rate, improve the operational efficiency of system to keep indoor heat exchanger; At this moment; Should consider to strengthen control by emphasis, take into account indoor temperature, humidity, in order to avoid it is excessive to depart from objectives to the degree of superheat of cold-producing medium.Adopt the synchronous closed-loop adjustment of compressor-expansion valve in the fine tuning stage: according to the input outdoor temperature
T w , the outdoor temperature rate of change
T w ', indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh ', regulate through self-adaptive PID, and the frequency signal f of output compressor, the rotating speed of control compressor; According to the input indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh ', and the frequency signal f of compressor, regulate through self-adaptive PID, and the aperture signal h of output expansion valve, the pulse value that the control expansion valve is opened; According to outdoor environment temperature
T w , rate of temperature change
T w ',And the frequency signal f of compressor, the rotating speed of control condensation fan; According to indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n With the indoor humidity rate of change
φ n ',And the frequency signal f of compressor, the rotating speed of control indoor evaporator breeze fan; Electric heater is by the temperature of controlled environment
T n With the variation of temperature rate
T n 'Control the heat that adds that drops into; Humidifier is by the relative humidity of controlled environment
φ n Rate of change with relative humidity
φ n 'The humidification amount that control drops into.
The present invention has following characteristics:
1, adopt stage by stage control mode, can shorten greatly the thermostatic and humidistatic air conditioning unit group the startup stage or receive external interference and time of causing controlled ambient temperature and humidity fluctuation;
2, adopt compressor-expansion valve Synchronization Control scheme, alleviated because compressor and expansion valve are independently controlled delay and the over control that causes in system's control separately;
3, combine traditional Adaptive PID Control method; Form compressor-expansion valve synchronous self-adapting pid control mode stage by stage, can be implemented in environment temperature is 7 ℃～30 ℃, relative humidity 40%～75%; Temperature control precision can reach ± and 0.2 ℃, the relative humidity control accuracy can reach ± 3%RH.
Description of drawings
Fig. 1 is the control principle block diagram of embodiment; Fig. 2 compressor frequency and indoor temperature are with the variation relation of running time; Fig. 3 compressor frequency and indoor relative humidity are with the variation relation of running time; The aperture of Fig. 4 compressor frequency, expansion valve and the degree of superheat are with the variation relation of running time.
Among the figure,
T w , T w ', T n , T n ', φ n , φ n ’ 、 ⊿ T Sh 、 ⊿ T Sh ',
fWith
hExpression is the frequency of outdoor temperature, outdoor temperature rate of change, indoor temperature, indoor temperature change generated in case rate, indoor relative humidity, indoor relative humidity rate of change, the degree of superheat, degree of superheat rate of change, compressor and the aperture of expansion valve respectively.
The specific embodiment
With reference to Fig. 1, in compressor-expansion valve Synchronization Control flow process, comprise frequency-changeable compressor, outdoor condenser, electric expansion valve, evaporimeter, electric heater and electrode humidifier stage by stage.Cold-producing medium is through frequency-changeable compressor; After the cold-producing medium of the HTHP that is come out by compressor got into the condenser heat release, throttling was depressurized in the evaporimeter through electric expansion valve, and the cold-producing medium of low-temp low-pressure is after the evaporimeter heat absorption; Return compressor, and then realize the refrigeration system circulation; The return air of controlled high ambient temperature high humidity through behind heater and humidifier fine setting heating and the humidification, is sent into controlled environment behind the evaporimeter cool-down dehumidification, keeping the humiture requirement of environment, and then the realization supply air system circulates.
When system started operation, the subject matter that solve was the difference of dwindling as early as possible between indoor temperature, humidity and the target setting.At this moment, system is in a unsettled running, accurately controls degree of superheat difficulty relatively often.Therefore, do not introduce the degree of superheat for its input parameter of control of frequency-changeable compressor, correspond to electric expansion valve and also do not introduce the degree of superheat, the adjusting rule is given in advance.Compressor can 3Hz/s speed raise until highest frequency operation down, the aperture of electric expansion valve is set at 50%-70%, the system that so both can guarantee also avoids the aperture of expansion valve to cause system low-voltage excessively slowly rapidly to controlled environment temperature reduction dehumidifying.Meanwhile, when controlled environment temperature and desired value differ 2 ℃, finish the startup stage of thinking system.Outdoor environment temperature
T w And rate of temperature change
T w 'The rotating speed of control condensation fan, heater is by the temperature of controlled environment
T n With the variation of temperature rate
T n 'Control the heat that adds that drops into, humidifier is by the relative humidity of controlled environment
φ n Rate of change with relative humidity
φ n 'The humidification amount that control drops into.For confirming of sampling time, should emphasis consider the characteristic of indoor temperature and humidity, need take into account the variation characteristic of refrigerant superheat degree simultaneously, the sampling period can suitably extend.
In system's normal course of operation; Room temperature humidity and target setting difference are less, and the main target of control is that the degree of superheat of as far as possible keeping cold-producing medium fluctuates in more among a small circle, and as far as possible near the target setting value; To keep indoor heat exchanger to remain best liquid supply rate, improve the operational efficiency of system.At this moment, should consider to strengthen control by emphasis, take into account indoor temperature, humidity, in order to avoid it is excessive to depart from objectives to the degree of superheat of cold-producing medium.When the difference of the temperature of controlled environment and setting value was within 2 ℃, system got into the fine tuning stage, according to the input outdoor temperature
T w , the outdoor temperature rate of change
T w ', indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh ', regulate through self-adaptive PID, and the frequency signal f of output compressor, the rotating speed of control compressor; According to the input indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh ', and the frequency signal f of compressor, regulate through self-adaptive PID, and the aperture signal h of output expansion valve, the pulse value that the control expansion valve is opened; According to outdoor environment temperature
T w , rate of temperature change
T w ',And the frequency signal f of compressor, the rotating speed of control condensation fan; According to indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n With the indoor humidity rate of change
φ n ',And the frequency signal f of compressor, the rotating speed of control indoor evaporator breeze fan; Electric heater is by the temperature of controlled environment
T n With the variation of temperature rate
T n 'Control the heat that adds that drops into; Humidifier is by the relative humidity of controlled environment
φ n Rate of change with relative humidity
φ n 'The humidification amount that control drops into.
For confirming of sampling time, should strengthen control by emphasis to the degree of superheat, need take into account the variation of indoor temperature and humidity simultaneously.Because the degree of superheat is relatively more responsive to the variation of operating mode, so desirable weak point of sampling period a bit.
Compressor-expansion valve Synchronization Control theory combines with traditional Adaptive PID Control theory stage by stage; Be built into compressor-expansion valve synchronous self-adapting pid control mode stage by stage; Through control software platform able to programme; On high accuracy frequency conversion thermostatic and humidistatic air conditioning unit, implement, and carry out humiture precision control experiment test.Fig. 2～4 have provided outdoor environment temperature respectively and have been controlled at 35 ℃; Indoor environment temperature is controlled at 22 ℃; Relative humidity is controlled at 55%; Have hot humidity load and disturb down (among the figure, providing hot humidity load to disturb at 10:20), the operating frequency of indoor temperature, relative humidity, compressor, the aperture of electric expansion valve and the degree of superheat are with the situation of change of running time.Experimental result shows that the aperture of the humiture of controlled environment, the operating frequency of compressor, electric expansion valve is keeping consistent step basically in the whole service process, have delay phenomenon hardly.Temperature control precision can reach ± and 0.2 ℃, the relative humidity control accuracy can reach ± 3%RH, and the degree of superheat of system is in whole experiment, and it is less to fluctuate.Thereby proved that the frequency-changeable compressor stage by stage that the present invention designed-electric expansion valve synchronous self-adapting PID controls scheme, well the delay phenomenon of resolution system control.
Claims (2)
1. a compressor stage by stage and expansion valve synchronisation control means that applies to thermostatic and humidistatic air conditioning unit; Said thermostatic and humidistatic air conditioning unit comprises frequency-changeable compressor, outdoor condenser, electric expansion valve, indoor evaporator, electric heater and electrode humidifier; Cold-producing medium is through frequency-changeable compressor; After the cold-producing medium inlet chamber external condenser heat release of the HTHP that is come out by frequency-changeable compressor, throttling is depressurized in the indoor evaporator through electric expansion valve, and the cold-producing medium of low-temp low-pressure is after the indoor evaporator heat absorption; Return frequency-changeable compressor, and then realize the refrigeration system circulation; The return air of controlled high ambient temperature high humidity is behind the evaporimeter cool-down dehumidification; Behind electric heater and electrode humidifier fine setting heating and humidification, send into controlled environment, to keep the humiture requirement of environment; And then realize that supply air system circulates; It is characterized in that: said control method is to start and normally moving under the two states according to thermostatic and humidistatic air conditioning unit, controls system to be divided into coarse adjustment control stage and fine tuning control stage, Different control stage employing Different control method; Adopt given in advance adjusted open loop in the coarse adjustment stage: compressor is with speed rising operation under highest frequency of 3Hz/s, and the aperture of electric expansion valve is set at 50%-70%; Adopt the synchronous closed-loop adjustment of compressor-expansion valve in the fine tuning stage: according to the input outdoor temperature
T w , the outdoor temperature rate of change
T w ', indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh ', regulate through self-adaptive PID, and the frequency signal f of output compressor, the rotating speed of control compressor; According to the input indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n , the indoor humidity rate of change
φ n ',The degree of superheat
⊿ T Sh With degree of superheat rate of change
⊿ T Sh ', and the frequency signal f of compressor, regulate through self-adaptive PID, and the aperture signal h of output expansion valve, the pulse value that the control expansion valve is opened; According to outdoor environment temperature
T w , rate of temperature change
T w ',And the frequency signal f of compressor, the rotating speed of control condensation fan; According to indoor temperature
T n , the indoor temperature change generated in case rate
T n ',Indoor humidity
φ n With the indoor humidity rate of change
φ n ',And the frequency signal f of compressor, the rotating speed of control indoor evaporator breeze fan; Electric heater is by the temperature of controlled environment
T n With the variation of temperature rate
T n 'Control the heat that adds that drops into; Humidifier is by the relative humidity of controlled environment
φ n Rate of change with relative humidity
φ n 'The humidification amount that control drops into.
2. control method according to claim 1; It is characterized in that: with the proportionate relationship of the operating frequency and the refrigerant flow of compressor; Mutually combine with the linear approximate relationship of the aperture of refrigerant flow and electric expansion valve; Set up the compressor operating frequency linear approximate relationship corresponding, and organically combine, realize compressor and expansion valve Synchronization Control through this functional relation with the aperture of electric expansion valve.
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| CN112944642B (en) * | 2021-01-29 | 2022-08-19 | 青岛海尔空调器有限总公司 | Method and device for condensation prevention control and air conditioner |
| WO2022183733A1 (en) * | 2021-03-01 | 2022-09-09 | 青岛海尔空调器有限总公司 | Humidity control method and air conditioner |
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| CN113531760A (en) * | 2021-06-03 | 2021-10-22 | 珠海格力电器股份有限公司 | Humidity control method and device, storage medium and processor |
| CN113531760B (en) * | 2021-06-03 | 2022-08-02 | 珠海格力电器股份有限公司 | Humidity control method and device, storage medium and processor |
| CN113513834A (en) * | 2021-07-01 | 2021-10-19 | 珠海格力电器股份有限公司 | Air conditioner control method and device and electronic equipment |
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| CN113819639B (en) * | 2021-09-07 | 2022-12-23 | 青岛海尔空调器有限总公司 | Control method and device for adjusting frequency of air conditioner compressor |
| CN113932364A (en) * | 2021-10-18 | 2022-01-14 | 宁波奥克斯电气股份有限公司 | Control method of air conditioner and air conditioner |
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Application publication date: 20120718 |