CN106642563A - Control method of air-conditioner expansion valve, control device and air-conditioner - Google Patents
Control method of air-conditioner expansion valve, control device and air-conditioner Download PDFInfo
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- CN106642563A CN106642563A CN201611142867.6A CN201611142867A CN106642563A CN 106642563 A CN106642563 A CN 106642563A CN 201611142867 A CN201611142867 A CN 201611142867A CN 106642563 A CN106642563 A CN 106642563A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method of an air-conditioner expansion valve, a control device and an air-conditioner. The method comprises the steps of conducting operation of air conditioning refrigeration, and obtaining a current indoor environment temperature, a current return air deviation of degree of superheat, and a current deviation variation amount of the degree of superheat; executing the following valve adjusting procedures if the current return air deviation of degree of superheat and the current deviation variation amount of the degree of superheat satisfy the conditions of degree of superheat and satisfy the condition of the indoor environment temperature at the same time, wherein the procedures specifically comprise the step of magnifying the current return air deviation of degree of superheat to be larger than zero and using the current return air deviation of degree of superheat as an actual return air deviation of degree of superheat, obtaining an actual deviation variation amount of the degree of superheat according to the actual return air deviation of degree of superheat, and then adjusting the opening degree of the expansion valve according to the actual return air deviation of degree of superheat and the actual return air deviation variation amount of the degree of superheat. According to the control method of the air-conditioner expansion valve, the control device and the air-conditioner, the self-adaptability of the adjustment of the expansion valve along with the changing of the temperature is achieved, and the operating performance of the system when the valve is adjusted in a degree of superheat and the comfort of the temperature adjustment can be improved.
Description
Technical field
The invention belongs to air-conditioning technique field, is control method, the control dress for being related to air-conditioning expansion valve specifically
Put and air-conditioning.
Background technology
The running frequency of frequency-conversion air-conditioning system compressor can automatically adjust according to the change of room temperature and design temperature,
To reach minimum temperature fluctuation, best comfort and the effect of maximum energy-saving.When compressor operating frequency is adjusted, air-conditioning system
Closed circuit cold medium flux also change therewith, be at this moment accomplished by being adjusted in synchronism expansion valve opening, realize the control of optimal efficiency.
At present, frequency-conversion air-conditioning system mainly adopts the aperture of the method variable expansion valve of the degree of superheat, and then adjusts air-conditioning system
Refrigerant circulation in system.And the degree of superheat is mainly by the return-air mistake to being determined by compressor return air temperature and indoor coil pipe
Temperature is calculated to obtain with target superheat degree.
When air-conditioning runs under different operating modes, compressor return air temperature and indoor coil pipe all can be affected.Especially
It is that under hot and humid environment, indoor evaporating pressure is big, and evaporating temperature is higher, the calculated value of the degree of superheat can be affected, and then affects
The performance of the air-conditioning system of expansion valve opening regulation is carried out by the degree of superheat.
The content of the invention
An object of the present invention is to provide a kind of control method and control device of air-conditioning expansion valve, by being indoors
Return-air degree of superheat deviation and return-air degree of superheat change of error amount are corrected during hot environment, realize expansion valve regulation with temperature
The adaptivity of change, improves the runnability and thermoregulator comfortableness of system when the degree of superheat adjusts valve.
For achieving the above object, the control method of the air-conditioning expansion valve that the present invention is provided is given using following technical proposals
To realize：
A kind of control method of air-conditioning expansion valve, methods described includes：
Air conditioner refrigerating runs, and obtains current indoor environment temperature, current compressor suction temperature, current indoor coil temperature, root
The current goal degree of superheat is obtained according to compressor operating frequency；
The current return-air degree of superheat is obtained according to the current compressor suction temperature and the current indoor coil temperature, according to institute
State the current return-air degree of superheat and the current goal degree of superheat obtains current return-air degree of superheat deviation, according to the current return-air mistake
The return-air degree of superheat deviation of the previous moment at temperature deviation and current time obtains current return-air degree of superheat change of error amount；
If meeting following degree of superheat conditions：The current return-air degree of superheat deviation and the current return-air degree of superheat change of error
Amount is respectively less than zero, while also meeting following indoor environment temperature conditions：At least include that the current indoor environment temperature is not little
In setting indoor environment temperature, then following tune valve processes are performed：
Increase the current return-air degree of superheat deviation to more than zero, as actual return-air degree of superheat deviation, returned according to the reality
The return-air degree of superheat deviation of the previous moment at gas degree of superheat deviation and current time obtains actual return-air degree of superheat change of error amount,
The aperture of expansion valve is adjusted according to the actual return-air degree of superheat deviation and the actual return-air degree of superheat change of error amount.
Method as above, the increase current return-air degree of superheat deviation to being more than zero, as actual return-air mistake
Temperature deviation, specifically includes：
The absolute value of the current return-air degree of superheat deviation is taken as actual return-air degree of superheat deviation.
Method as above, described indoor environment temperature condition also includes：The current indoor environment temperature is not little
In the indoor environment temperature of the previous moment at current time.
Preferably, the indoor environment temperature that sets is as 27 DEG C.
Method as above, if being unsatisfactory for described degree of superheat condition and/or being unsatisfactory for described indoor environment temperature
Condition, then perform following tune valve processes：
The aperture of expansion valve is adjusted according to the current return-air degree of superheat deviation and the current return-air degree of superheat change of error amount.
For achieving the above object, the control device of the air-conditioning expansion valve that the present invention is provided is given using following technical proposals
To realize：
A kind of control device of air-conditioning expansion valve, described device includes：
Indoor environment temperature acquiring unit, for obtaining indoor environment temperature；
Compressor return air temperature acquiring unit, for obtaining compressor return air temperature；
Indoor coil pipe acquiring unit, for obtaining indoor coil pipe；
Target superheat degree acquiring unit, for obtaining target superheat degree according to compressor operating frequency；
Return-air degree of superheat acquiring unit, for obtaining return-air mistake according to the compressor return air temperature and the indoor coil pipe
Temperature；
Return-air degree of superheat deviation acquiring unit, it is overheated for obtaining return-air according to the return-air degree of superheat and the target superheat degree
Degree deviation；
Return-air degree of superheat change of error amount acquiring unit, for according to the return-air mistake of the return-air degree of superheat deviation and previous moment
Temperature deviation obtains return-air degree of superheat change of error amount；
Degree of superheat condition judgment unit, for judging whether to meet following degree of superheat conditions：The return-air degree of superheat deviation is obtained
Take working as acquired in the current return-air degree of superheat deviation and the return-air degree of superheat change of error amount acquiring unit acquired in unit
Front return-air degree of superheat change of error amount is respectively less than zero, and exports judged result；
Indoor environment temperature condition judgment unit, for judging whether to meet following indoor environment temperature conditions：At least include
Current indoor environment temperature acquired in the indoor environment temperature acquiring unit is exported not less than setting indoor environment temperature
Judged result；
First adjusts valve cell, for judging to meet the degree of superheat condition and the room in the degree of superheat condition judgment unit
When interior ambient temperature conditions judging unit judges to meet the indoor environment temperature condition, following tune valve processes are performed：Increase
The current return-air degree of superheat deviation is extremely more than zero, as actual return-air degree of superheat deviation, according to the actual return-air degree of superheat
The return-air degree of superheat deviation of the previous moment at deviation and current time obtains actual return-air degree of superheat change of error amount, according to described
Actual return-air degree of superheat deviation and the actual return-air degree of superheat change of error amount adjust the aperture of expansion valve.
Device as above, the increase current return-air degree of superheat deviation to being more than zero, as actual return-air mistake
Temperature deviation, specifically includes：
The absolute value of the current return-air degree of superheat deviation is taken as actual return-air degree of superheat deviation.
Device as above, described indoor environment temperature condition also includes：The current indoor environment temperature is not little
In the indoor environment temperature of the previous moment at current time.
Device as above, described device also includes that second adjusts valve cell, in the degree of superheat condition judgment list
Unit judges that being unsatisfactory for the degree of superheat condition and/or the indoor environment temperature condition judgment unit judges to be unsatisfactory for the interior
During ambient temperature conditions, following tune valve processes are performed：According to the current return-air degree of superheat deviation and the current return-air mistake
Temperature change of error amount adjusts the aperture of expansion valve.
Present invention also offers a kind of air-conditioning, including expansion valve, the air-conditioning also includes above-mentioned air-conditioning expansion valve
Control device.
Compared with prior art, advantages of the present invention and good effect are：In air conditioner refrigerating running, if return-air
Degree of superheat deviation and return-air degree of superheat change of error amount are respectively less than zero, if do not adjusted, expansion valve should be carried out closing valve actuation
Make；If now indoor environment temperature is higher, higher than setting indoor environment temperature, will be inclined by taking the return-air degree of superheat more than zero
Difference is used as the return-air degree of superheat deviation of actual control and the return-air degree of superheat of participation calculating return-air degree of superheat change of error amount
Deviation realizing the correction to return-air degree of superheat deviation and return-air degree of superheat change of error amount, by the correction, to a certain extent
The pass valve events of expansion valve can be changed into valve opening action, realize adjusting with the self adaptation of indoor temperature change generated in case expansion valve opening
Property optimization, improve the degree of superheat adjust valve when system runnability and thermoregulator comfortableness.
After the specific embodiment of the present invention is read in conjunction with the accompanying, the other features and advantages of the invention will become more clear
Chu.
Description of the drawings
Fig. 1 is the flow chart based on control method one embodiment of air-conditioning expansion valve of the present invention；
Fig. 2 is the structured flowchart based on control device one embodiment of air-conditioning expansion valve of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below with reference to drawings and Examples,
The present invention is described in further detail.
Fig. 1 is referred to, the figure show the flow chart based on control method one embodiment of air-conditioning expansion valve of the present invention.
As shown in figure 1, the embodiment realizes that the control method of air-conditioning expansion valve comprises the steps the process for constituting：
Step 11：Air conditioner refrigerating runs, and obtains current indoor environment temperature, current compressor suction temperature, current indoor coil pipe
Temperature, according to compressor operating frequency the current goal degree of superheat is obtained.
Current indoor environment temperature, current compressor suction temperature and current indoor coil temperature can be by accordingly examining
Location installs temperature detection part to realize.For example, by be disposed in the interior or indoor apparatus of air conditioner air inlet temperature
Sensor detects current indoor environment temperature；Current return air temperature is detected by being arranged on the temperature sensor at compressor return air mouth
Degree；Current indoor coil temperature is detected by being disposed in the interior the coil temperature sensor of heat exchanger.
And the current goal degree of superheat is value related to air conditioning operating mode and compressor operating frequency, known, in system
Under chill formula, can be got by way of tabling look-up and currently be run with compressor operating frequency, specifically with compressor
The one-to-one current goal degree of superheat of frequency.And, general for convenience of calculation, a running frequency scope is to having
One target superheat degree.For example, the compressor operating frequency less than 20Hz correspond to a target superheat degree, the pressure more than 90Hz
Contracting machine running frequency correspond to a target superheat degree, the frequency range correspondence in the frequency between 20Hz to 90Hz, per 10Hz
A target superheat degree.
Step 12：Obtain current return-air degree of superheat deviation and current return-air degree of superheat change of error amount.
Specifically, be the current compressor suction temperature that got according to step 11 and current indoor coil temperature, by
The current return-air degree of superheat is calculated according to following formula：
The current return-air degree of superheat=current compressor suction temperature-current indoor coil temperature；
Then, the current goal degree of superheat that got according to the current return-air degree of superheat and step 11, calculate according to the following equation
Current return-air degree of superheat deviation：
The current return-air degree of superheat deviation=current return-air degree of superheat-current goal degree of superheat；
Return-air degree of superheat deviation further according to current return-air degree of superheat deviation and the previous moment at current time, according to the following equation
Calculate current return-air degree of superheat change of error amount：
Current return-air degree of superheat change of error amount=current return-air degree of superheat change of error amount-previous moment return-air degree of superheat deviation.
Step 13：When meeting degree of superheat condition and indoor environment temperature condition at the same time, following tune valve processes are performed：Increase
Big current return-air degree of superheat deviation obtains actual return-air degree of superheat change of error to being more than zero according to actual return-air degree of superheat deviation
Amount, according to actual return-air degree of superheat deviation and the actual return-air degree of superheat change of error amount aperture of expansion valve is adjusted.
Wherein, degree of superheat condition includes：Current return-air degree of superheat deviation and current return-air degree of superheat change of error amount are little
In zero.And indoor environment temperature condition at least includes current indoor environment temperature not less than setting indoor environment temperature.Setting room
The temperature value that interior environment temperature is known, prestored, is to reflect whether indoor environment temperature belongs to of high temperature
Threshold value.Preferably, indoor environment temperature is set as 27 DEG C.
Step 12 by calculating get current return-air degree of superheat deviation and current return-air degree of superheat change of error amount it
Afterwards, both sizes with zero are judged.If met degree of superheat condition, namely currently return-air degree of superheat deviation and current return-air would be overheated
When degree change of error amount is respectively less than zero, and the current return-air degree of superheat deviation of non-immediate basis and current return-air degree of superheat change of error
Amount carries out the control of expansion valve opening, and is also to according to whether meeting current indoor environment temperature not less than the indoor ring of setting
The condition of border temperature makees further correction process.
If meeting condition of the current indoor environment temperature not less than setting indoor environment temperature, show now indoor ring
Border temperature drift.In the case that indoors environment temperature is higher, as it was previously stated, in the hot season of air conditioner refrigerating operation, high temperature
High humidity would generally be accompanied by, under hot and humid environment, indoor evaporating pressure is big, and evaporating temperature is higher.Now, due to calculating
Current return-air degree of superheat deviation and current return-air degree of superheat change of error amount be respectively less than zero, according to normal expansion valve regulation side
Formula, should now perform pass valve events, need the aperture for reducing expansion valve.But, if closing valve, refrigerant circulation is reduced, made
Obtain evaporating pressure bigger, be also easy to produce condensation, and refrigeration can be reduced.Therefore, degree of superheat condition and indoor ring are met at the same time
During the temperature conditionss of border, by the direction of action and movement range of adjustment expansion valve.Specifically, following processes are carried out：
Increase current return-air degree of superheat deviation to more than the zero actual return-air degree of superheat deviation of conduct, it is inclined according to the actual return-air degree of superheat
The return-air degree of superheat deviation of the previous moment at difference and current time obtains actual return-air degree of superheat change of error amount, is returned according to actual
Gas degree of superheat deviation and actual return-air degree of superheat change of error amount adjust the aperture of expansion valve.
As preferred embodiment, not arbitrarily increasing current return-air degree of superheat deviation, but adopt and current return-air
The related mode of degree of superheat deviation is increased.Specifically, current return-air degree of superheat deviation is increased to being more than zero, as reality
Return-air degree of superheat deviation, specifically includes：The absolute value of current return-air degree of superheat deviation is taken as actual return-air degree of superheat deviation.
By the way that current return-air degree of superheat deviation is increased to more than zero, while actual return-air degree of superheat change of error can be increased
Amount, then when adjusting the aperture of expansion valve according to actual return-air degree of superheat deviation and actual return-air degree of superheat change of error amount, adjustment
Direction may be changing to increase the valve opening position of valve opening.Even if not being valve opening operation, it may also reduce close valve step number, reduce
The amplitude that refrigerant circulation is reduced.By the correction to return-air degree of superheat deviation and return-air degree of superheat change of error amount, realize
Expansion valve opening is adjusted and is optimized with the adaptivity of indoor temperature change generated in case, so as to improve the maneuverability of system when the degree of superheat adjusts valve
Can be with thermoregulator comfortableness.
Also, using the method for above-described embodiment, when degree of superheat condition and indoor environment temperature condition is met, not by force
Expansion valve processed performs valve opening action, but is adjusted according to the size of current return-air degree of superheat deviation, effectively prevent pressure
Expansion valve performs valve opening action and issuable icing phenomenon and anti-freeze are protected, and further ensures the runnability of system
With thermoregulator comfortableness.
And if be unsatisfactory for degree of superheat condition, or indoor environment temperature condition is unsatisfactory for, or two conditions are discontented with
Foot, in the case of these, will directly perform and be adjusted according to current return-air degree of superheat deviation and current return-air degree of superheat change of error amount
The process of the aperture of expansion valve, and do not carry out intervention regulation so that system is normally run according to setting control mode.
Used as another preferred embodiment, indoor environment temperature condition is not except little including current indoor environment temperature
Outside the condition of setting indoor environment temperature, also including current indoor environment temperature not less than the previous moment at current time
The condition of indoor environment temperature.That is, current indoor environment temperature is not only higher, and indoor environment temperature presentation is non-decreasing
Trend, performs again current return-air degree of superheat correction for drift in the case of this.And if although current indoor environment temperature is higher,
Current indoor environment temperature is less than the indoor environment temperature of previous moment, namely indoor environment temperature is presented downward trend, also temporarily
And current return-air degree of superheat correction for drift is not performed, but it is inclined according to current return-air degree of superheat deviation and the current return-air degree of superheat
Difference variable quantity adjusts the aperture of expansion valve, it is therefore an objective to keep original control mode not as far as possible under the non-harsh conditions of environment indoors
Change.
Fig. 2 is referred to, the figure show the structural frames based on control device one embodiment of air-conditioning expansion valve of the present invention
Figure.
As schematically shown in Figure 2, the embodiment realizes the construction unit, each unit that the control device of air-conditioning expansion valve includes
Data transmission procedure between function and unit is as follows：
Control device includes：
Indoor environment temperature acquiring unit 201, for obtaining indoor environment temperature.
Compressor return air temperature acquiring unit 202, for obtaining compressor return air temperature.
Indoor coil pipe acquiring unit 203, for obtaining indoor coil pipe.
Target superheat degree acquiring unit 204, for obtaining target superheat degree according to compressor operating frequency.
Return-air degree of superheat acquiring unit 205, for obtaining return-air mistake according to compressor return air temperature and indoor coil pipe
Temperature.
Return-air degree of superheat deviation acquiring unit 206, it is overheated for obtaining return-air according to the return-air degree of superheat and target superheat degree
Degree deviation.
Return-air degree of superheat change of error amount acquiring unit 207, for returning according to return-air degree of superheat deviation and previous moment
Gas degree of superheat deviation obtains return-air degree of superheat change of error amount.
Degree of superheat condition judgment unit, for judging whether to meet following degree of superheat conditions：Return-air degree of superheat deviation is obtained
Take working as current return-air degree of superheat deviation and return-air degree of superheat change of error amount acquiring unit 207 acquisition acquired in unit 206
Front return-air degree of superheat change of error amount is respectively less than zero, and exports judged result.
Indoor environment temperature condition judgment unit 209, for judging whether to meet following indoor environment temperature conditions：Extremely
Include the current indoor environment temperature acquired in indoor environment temperature acquiring unit 201 less not less than setting indoor environment temperature,
And export judged result.
First adjusts valve cell 210, for judging to meet degree of superheat condition and interior in degree of superheat condition judgment unit 208
When ambient temperature conditions judging unit 209 judges to meet indoor environment temperature condition, following tune valve processes are performed：Increase is current
Return-air degree of superheat deviation is extremely more than zero as actual return-air degree of superheat deviation, according to actual return-air degree of superheat deviation and current time
The return-air degree of superheat deviation of previous moment obtain actual return-air degree of superheat change of error amount, according to actual return-air degree of superheat deviation
With the aperture that actual return-air degree of superheat change of error amount adjusts expansion valve.
Additionally, control device also includes the second tune valve cell, for judging discontented in degree of superheat condition judgment unit 208
When sufficient degree of superheat condition and/or indoor environment temperature condition judgment unit 209 judge to be unsatisfactory for indoor environment temperature condition, perform
Following tune valve processes：Opening for expansion valve is adjusted according to current return-air degree of superheat deviation and current return-air degree of superheat change of error amount
Degree.
The control device of said structure is applied in the air-conditioning with expansion valve, and each construction unit operation completes correspondence work(
The software program of energy, according to the process of above-mentioned control method the control to air-conditioning expansion valve is realized, reaches the skill of preceding method
Art effect.
Above example is only illustrating technical scheme, rather than is limited；Although with reference to aforementioned reality
Apply example to be described in detail the present invention, for the person of ordinary skill of the art, still can be to aforementioned enforcement
Technical scheme described in example is modified, or carries out equivalent to which part technical characteristic；And these are changed or replace
Change, do not make the spirit and scope of the essence disengaging claimed technical solution of the invention of appropriate technical solution.
Claims (10)
1. a kind of control method of air-conditioning expansion valve, it is characterised in that methods described includes：
Air conditioner refrigerating runs, and obtains current indoor environment temperature, current compressor suction temperature, current indoor coil temperature, root
The current goal degree of superheat is obtained according to compressor operating frequency；
The current return-air degree of superheat is obtained according to the current compressor suction temperature and the current indoor coil temperature, according to institute
State the current return-air degree of superheat and the current goal degree of superheat obtains current return-air degree of superheat deviation, according to the current return-air mistake
The return-air degree of superheat deviation of the previous moment at temperature deviation and current time obtains current return-air degree of superheat change of error amount；
If meeting following degree of superheat conditions：The current return-air degree of superheat deviation and the current return-air degree of superheat change of error
Amount is respectively less than zero, while also meeting following indoor environment temperature conditions：At least include that the current indoor environment temperature is not little
In setting indoor environment temperature, then following tune valve processes are performed：
Increase the current return-air degree of superheat deviation to more than zero, as actual return-air degree of superheat deviation, returned according to the reality
The return-air degree of superheat deviation of the previous moment at gas degree of superheat deviation and current time obtains actual return-air degree of superheat change of error amount,
The aperture of expansion valve is adjusted according to the actual return-air degree of superheat deviation and the actual return-air degree of superheat change of error amount.
2. method according to claim 1, it is characterised in that the increase current return-air degree of superheat deviation is to being more than
Zero, as actual return-air degree of superheat deviation, specifically include：
The absolute value of the current return-air degree of superheat deviation is taken as actual return-air degree of superheat deviation.
3. method according to claim 1, it is characterised in that described indoor environment temperature condition also includes：It is described to work as
Indoor environment temperature of the front indoor environment temperature not less than the previous moment at current time.
4. method according to claim 1, it is characterised in that the indoor environment temperature that sets is as 27 DEG C.
5. method according to any one of claim 1 to 4, it is characterised in that if being unsatisfactory for described degree of superheat condition
And/or be unsatisfactory for described indoor environment temperature condition, then perform following tune valve processes：
The aperture of expansion valve is adjusted according to the current return-air degree of superheat deviation and the current return-air degree of superheat change of error amount.
6. a kind of control device of air-conditioning expansion valve, it is characterised in that described device includes：
Indoor environment temperature acquiring unit, for obtaining indoor environment temperature；
Compressor return air temperature acquiring unit, for obtaining compressor return air temperature；
Indoor coil pipe acquiring unit, for obtaining indoor coil pipe；
Target superheat degree acquiring unit, for obtaining target superheat degree according to compressor operating frequency；
Return-air degree of superheat acquiring unit, for obtaining return-air mistake according to the compressor return air temperature and the indoor coil pipe
Temperature；
Return-air degree of superheat deviation acquiring unit, it is overheated for obtaining return-air according to the return-air degree of superheat and the target superheat degree
Degree deviation；
Return-air degree of superheat change of error amount acquiring unit, for according to the return-air mistake of the return-air degree of superheat deviation and previous moment
Temperature deviation obtains return-air degree of superheat change of error amount；
Degree of superheat condition judgment unit, for judging whether to meet following degree of superheat conditions：The return-air degree of superheat deviation is obtained
Take working as acquired in the current return-air degree of superheat deviation and the return-air degree of superheat change of error amount acquiring unit acquired in unit
Front return-air degree of superheat change of error amount is respectively less than zero, and exports judged result；
Indoor environment temperature condition judgment unit, for judging whether to meet following indoor environment temperature conditions：At least include
Current indoor environment temperature acquired in the indoor environment temperature acquiring unit is exported not less than setting indoor environment temperature
Judged result；
First adjusts valve cell, for judging to meet the degree of superheat condition and the room in the degree of superheat condition judgment unit
When interior ambient temperature conditions judging unit judges to meet the indoor environment temperature condition, following tune valve processes are performed：Increase
The current return-air degree of superheat deviation is extremely more than zero, as actual return-air degree of superheat deviation, according to the actual return-air degree of superheat
The return-air degree of superheat deviation of the previous moment at deviation and current time obtains actual return-air degree of superheat change of error amount, according to described
Actual return-air degree of superheat deviation and the actual return-air degree of superheat change of error amount adjust the aperture of expansion valve.
7. device according to claim 6, it is characterised in that the increase current return-air degree of superheat deviation is to being more than
Zero, as actual return-air degree of superheat deviation, specifically include：
The absolute value of the current return-air degree of superheat deviation is taken as actual return-air degree of superheat deviation.
8. device according to claim 6, it is characterised in that described indoor environment temperature condition also includes：It is described to work as
Indoor environment temperature of the front indoor environment temperature not less than the previous moment at current time.
9. the device according to any one of claim 6 to 8, it is characterised in that described device also includes that second adjusts valve list
Unit, for judging to be unsatisfactory for the degree of superheat condition and/or the indoor environment temperature in the degree of superheat condition judgment unit
When condition judgment unit judges to be unsatisfactory for the indoor environment temperature condition, following tune valve processes are performed：According to described current
Return-air degree of superheat deviation and the current return-air degree of superheat change of error amount adjust the aperture of expansion valve.
10. a kind of air-conditioning, including expansion valve, it is characterised in that the air-conditioning also includes arbitrary in the claims 6 to 9
The control device of the air-conditioning expansion valve described in.
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