CN106610091B - Air-conditioning expansion valve control method and control device based on the degree of superheat - Google Patents
Air-conditioning expansion valve control method and control device based on the degree of superheat Download PDFInfo
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- CN106610091B CN106610091B CN201611142846.4A CN201611142846A CN106610091B CN 106610091 B CN106610091 B CN 106610091B CN 201611142846 A CN201611142846 A CN 201611142846A CN 106610091 B CN106610091 B CN 106610091B
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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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- Physics & Mathematics (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of air-conditioning expansion valve control method and control device based on the degree of superheat, the described method includes: air conditioner refrigerating is run, current indoor environment temperature, current compressor delivery temperature, current return-air degree of superheat deviation and current return-air degree of superheat change of error amount are obtained；If the current return-air degree of superheat deviation and the current return-air degree of superheat deviation meet degree of superheat condition, also meet temperature condition simultaneously, it then executes following tune valve processes: increasing the current return-air degree of superheat deviation to more than zero, as practical return-air degree of superheat deviation, increase the current return-air degree of superheat change of error amount to more than zero, as practical return-air degree of superheat deviation, according to the aperture of the practical return-air degree of superheat deviation and the practical return-air degree of superheat change of error amount adjustment expansion valve.With the application of the invention, the adaptivity that expansion valve regulation varies with temperature is realized, the comfort that the runnability of system and temperature are adjusted when improving degree of superheat tune valve.
Description
Technical field
The invention belongs to air-conditioning technique fields, specifically, being to be related to the control of air-conditioning expansion valve, more specifically
It says, is to be related to air-conditioning expansion valve control method and control device based on the degree of superheat.
Background technique
The running frequency of frequency-conversion air-conditioning system compressor can automatically adjust according to the variation of room temperature and set temperature,
To achieve the effect that minimum temperature fluctuation, best comfort and maximum energy-saving.When compressor operating frequency adjustment, air-conditioning system
Circulation loop cold medium flux also change therewith, at this moment just need to be adjusted in synchronism expansion valve opening, realize the control of best efficiency.
Currently, frequency-conversion air-conditioning system mainly uses the aperture of the method variable expansion valve of the degree of superheat, and then adjust air-conditioning system
Refrigerant circulation in system.And the degree of superheat is mainly by the return-air mistake determined by compressor return air temperature and indoor coil pipe
Temperature is calculated to obtain with target superheat degree.
When air-conditioning is run under different operating conditions, compressor return air temperature and indoor coil pipe can all be affected.Especially
It is under hot and humid environment, indoor evaporating pressure is big, and evaporating temperature is higher, will affect the calculated value of the degree of superheat, and then influence
The performance of the air-conditioning system of expansion valve opening adjusting is carried out by the degree of superheat.
Summary of the invention
The object of the present invention is to provide a kind of air-conditioning expansion valve control method and control device based on the degree of superheat, by
When interior is hot environment and excessively high compressor exhaust temperature to return-air degree of superheat deviation and return-air degree of superheat change of error amount into
The adaptivity that expansion valve regulation varies with temperature, the runnability and temperature of system when improving degree of superheat tune valve are realized in row correction
Spend the comfort adjusted.
For achieving the above object, air-conditioning expansion valve control method provided by the invention, which adopts the following technical solutions, gives
It realizes:
A kind of control method of air-conditioning expansion valve, which comprises
Air conditioner refrigerating operation obtains current indoor environment temperature, current compressor suction temperature, current compressor exhaust temperature
Degree, current indoor coil temperature obtain the current goal degree of superheat according to compressor operating frequency；
The current return-air degree of superheat, root are obtained according to the current compressor suction temperature and the current indoor coil temperature
Current return-air degree of superheat deviation is obtained according to the current return-air degree of superheat and the current goal degree of superheat, according to described current time
The return-air degree of superheat deviation of gas degree of superheat deviation and the previous moment at 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 deviation
Variable quantity is respectively less than zero, while also meeting following temperature conditions: being not less than including at least the current indoor environment temperature and sets
Indoor environment temperature and the current compressor delivery temperature are determined not less than setting delivery temperature, then execute following tune valve mistakes
Journey:
Increase the current return-air degree of superheat deviation to more than zero, as practical return-air degree of superheat deviation, works as described in increase
Preceding return-air degree of superheat change of error amount to more than zero, as practical return-air degree of superheat deviation, according to the practical return-air degree of superheat
The aperture of deviation and the practical return-air degree of superheat change of error amount adjustment expansion valve.
Method as described above, it is described to increase the current return-air degree of superheat deviation to more than zero, as practical return-air mistake
Temperature deviation increases the current return-air degree of superheat change of error amount to more than zero, as practical return-air degree of superheat deviation, according to
The aperture of the practical return-air degree of superheat deviation and the practical return-air degree of superheat change of error amount adjustment expansion valve is specific to wrap
It includes:
It takes the inclined absolute value of the difference of the current return-air degree of superheat to be used as practical return-air degree of superheat deviation, takes the current return-air
The absolute value of degree of superheat change of error amount is used as practical return-air degree of superheat change of error amount, inclined according to the practical return-air degree of superheat
The aperture of the poor and described practical return-air degree of superheat change of error amount adjustment expansion valve.
Preferably, the indoor environment temperature that sets is 27 DEG C.
Preferably, the setting delivery temperature protects temperature to determine according to compressor air-discharging, and the setting delivery temperature
Temperature is protected less than the compressor air-discharging.
Method as described above is held if being unsatisfactory for the degree of superheat condition and/or being unsatisfactory for the temperature condition
The following tune valve process of row:
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
Aperture.
For achieving the above object, the control device of air-conditioning expansion valve provided by the invention, which adopts the following technical solutions, gives
To realize:
A kind of control device of air-conditioning expansion valve, described device include:
Indoor environment temperature acquiring unit, for obtaining indoor environment temperature；
Compressor return air temperature acquiring unit, for obtaining compressor return air temperature；
Compressor exhaust temperature acquiring unit, for obtaining compressor exhaust 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 being obtained back according to the compressor return air temperature and the indoor coil pipe
The gas degree of superheat；
Return-air degree of superheat deviation acquiring unit, for obtaining return-air according to the return-air degree of superheat and the target superheat degree
Degree of superheat deviation；
Return-air degree of superheat change of error amount acquiring unit, for time according to the 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, meet following degree of superheat conditions for judging whether: the return-air degree of superheat is inclined
Acquired in current return-air degree of superheat deviation acquired in poor acquiring unit and the return-air degree of superheat change of error amount acquiring unit
Current return-air degree of superheat change of error amount be respectively less than zero, and export judging result；
Temperature condition judgment unit meets following temperature conditions for judging whether: including at least the indoor environment
Current indoor environment temperature acquired in temperature acquiring unit is not less than setting indoor environment temperature and the compressor air-discharging
Current compressor delivery temperature acquired in temperature acquiring unit exports judging result not less than setting delivery temperature；
First adjusts valve cell, for meeting the degree of superheat condition and institute in degree of superheat condition judgment unit judgement
The judgement of temperature condition judgment unit is stated when meeting the temperature condition, following tune valve processes is executed: increasing the current return-air
Degree of superheat deviation to more than zero increases the current return-air degree of superheat change of error amount extremely as practical return-air degree of superheat deviation
Greater than zero, as practical return-air degree of superheat deviation, according to the practical return-air degree of superheat deviation and the practical return-air degree of superheat
The aperture of change of error amount adjustment expansion valve.
Device as described above, it is described to increase the current return-air degree of superheat deviation to more than zero, as practical return-air mistake
Temperature deviation increases the current return-air degree of superheat change of error amount to more than zero, as practical return-air degree of superheat deviation, according to
The aperture of the practical return-air degree of superheat deviation and the practical return-air degree of superheat change of error amount adjustment expansion valve is specific to wrap
It includes:
It takes the inclined absolute value of the difference of the current return-air degree of superheat to be used as practical return-air degree of superheat deviation, takes the current return-air
The absolute value of degree of superheat change of error amount is used as practical return-air degree of superheat change of error amount, inclined according to the practical return-air degree of superheat
The aperture of the poor and described practical return-air degree of superheat change of error amount adjustment expansion valve.
Preferably, the indoor environment temperature that sets is 27 DEG C.
Preferably, the setting delivery temperature protects temperature to determine according to compressor air-discharging, and the setting delivery temperature
Temperature is protected less than the compressor air-discharging.
Device as described above, described device further include the second tune valve cell, single for judging in the degree of superheat condition
Member determines to be unsatisfactory for the degree of superheat condition and/or the temperature condition judgment unit judgement when being unsatisfactory for the temperature condition,
Execute following tune valve processes: according to the current return-air degree of superheat deviation and the current return-air degree of superheat change of error amount tune
The aperture of whole expansion valve.
Compared with prior art, the advantages and positive effects of the present invention are: in air conditioner refrigerating operational process, 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 execute to close valve actuation
Make；If indoor environment temperature is higher at this time, be higher than setting indoor environment temperature, and at this time compressor exhaust temperature nor less than
Delivery temperature is set, it will be by increasing current return-air degree of superheat deviation to more than zero and increasing current return-air degree of superheat change of error
Amount to more than zero mode realize the correction to return-air degree of superheat deviation and return-air degree of superheat change of error amount, by the correction,
The pass valve events for forcing expansion valve are become into valve opening movement, inappropriate pass valve is avoided to cause the decline and temperature of system performance
The decline of degree condition comfort, realization change expansion valve opening adjusting with room temperature and compressor exhaust temperature adaptive
Property optimization.
After a specific embodiment of the invention is read in conjunction with the figure, the other features and advantages of the invention will become more clear
Chu.
Detailed description of the invention
Fig. 1 is the flow chart of control method one embodiment based on air-conditioning expansion valve of the present invention；
Fig. 2 is the structural block diagram of control device one embodiment based on air-conditioning expansion valve of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to drawings and examples,
Invention is further described in detail.
Referring to Figure 1, which show the flow chart of control method one embodiment based on air-conditioning expansion valve of the present invention,
Specifically realize one embodiment of the air-conditioning expansion valve control method based on the degree of superheat.
As shown in Figure 1, the embodiment realizes that the control method of air-conditioning expansion valve includes the following steps the process constituted:
Step 11: air conditioner refrigerating operation obtains current indoor environment temperature, current compressor suction temperature, current compression
Machine delivery temperature, current indoor coil temperature obtain the current goal degree of superheat according to compressor operating frequency.
Current indoor environment temperature, current compressor suction temperature, current compressor delivery temperature and current indoor coil pipe
Temperature can be realized by installing temperature detection part in corresponding check bit.For example, indoors or empty by setting
The temperature sensor of indoor unit air inlet is adjusted to detect current indoor environment temperature；By the way that the temperature at compressor return air mouth is arranged in
It spends sensor and detects current compressor suction temperature；By the way that the current pressure of temperature sensor detection at exhaust outlet of compressor is arranged in
Contracting machine delivery temperature；Coil temperature sensor by the way that heat exchanger indoors is arranged detects current indoor coil temperature.
And the current goal degree of superheat is value relevant to air conditioning operating mode and compressor operating frequency, known, is being made
Under cold mode, it 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.Moreover, for convenience of calculation, in general, a running frequency range is corresponding with
One target superheat degree.For example, the compressor operating frequency less than 20Hz corresponds to a target superheat degree, the pressure greater than 90Hz
Contracting machine running frequency corresponds to a target superheat degree, in the frequency between 20Hz to 90Hz, the frequency range of every 10Hz it is corresponding
A target superheat degree.
Step 12: obtaining 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 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 is got according to the current return-air degree of superheat and step 11 is counted according to the following equation
Calculate 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；
Further according to the return-air degree of superheat deviation of current return-air degree of superheat deviation and the previous moment at current time, according to following
Formula calculates 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 temperature condition at the same time, executing following tune valve processes: increasing current return
Gas degree of superheat deviation to more than zero be used as practical return-air degree of superheat deviation, increase current return-air degree of superheat change of error amount to more than
Zero is used as practical return-air degree of superheat deviation, is adjusted according to practical return-air degree of superheat deviation and practical return-air degree of superheat change of error amount
The aperture of expansion valve.
Wherein, degree of superheat condition includes: that current return-air degree of superheat deviation and current return-air degree of superheat change of error amount are small
In zero.And temperature condition includes at least current indoor environment temperature not less than setting indoor environment temperature and current compressor exhaust
Temperature is not less than setting delivery temperature.Setting indoor environment temperature is a known, pre-stored temperature value, is reflection room
Whether interior environment temperature belongs to a threshold value of high temperature.Preferably, indoor environment temperature is set as 27 DEG C.Set delivery temperature
It is a known, pre-stored temperature value, is a threshold value for reflecting whether compressor exhaust temperature is excessively high.As preferred
Embodiment, setting delivery temperature according to compressor air-discharging protect temperature determine, and set delivery temperature be less than the compressor
Exhaust protection temperature.For example, setting delivery temperature protects small 5 DEG C of temperature or so than compressor air-discharging.And compressor air-discharging is protected
Temperature is also known temperature value.
Step 12 by calculate get current return-air degree of superheat deviation and current return-air degree of superheat change of error amount it
Afterwards, judge the size of the two with zero.If meeting degree of superheat condition, namely current return-air degree of superheat deviation and current return-air overheat
When degree change of error amount is respectively less than zero, and the current return-air degree of superheat deviation of indirect 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 and current compressor delivery temperature of border temperature make further correction process not less than the condition of setting delivery temperature.
If meeting condition of the current indoor environment temperature not less than setting indoor environment temperature, show indoor ring at this time
Border temperature drift；If meeting condition of the current compressor delivery temperature not less than setting delivery temperature, show current compression
Machine delivery temperature is also higher.In the case that environment temperature is higher indoors, as previously mentioned, in the hot season of air conditioner refrigerating operation
Section, high temperature would generally be along with high humidity, and under hot and humid environment, indoor evaporating pressure is big, and evaporating temperature is higher.And compressor
Delivery temperature is higher, is easy to enter excessively high guard mode.At this point, due to calculated current return-air degree of superheat deviation and currently
Return-air degree of superheat change of error amount is respectively less than zero, according to normal expansion valve regulative mode, should execute pass valve events at this time, needs
Reduce the aperture of expansion valve.But if closing valve, refrigerant circulation is reduced, so that evaporating pressure is bigger, is also easy to produce condensation,
And delivery temperature can be made higher and enter guard mode, it can then reduce refrigeration effect.Therefore, meet the degree of superheat at the same time
When condition and temperature condition, the direction of action for adjusting expansion valve is become into valve opening position from closing direction.It specifically, is to execute
Following processes:
Increase current return-air degree of superheat deviation to more than zero as practical return-air degree of superheat deviation, increases current return-air overheat
Change of error amount to more than zero is spent as practical return-air degree of superheat deviation, according to practical return-air degree of superheat deviation and practical return-air mistake
The aperture of temperature change of error amount adjustment expansion valve.If practical return-air degree of superheat deviation and practical return-air degree of superheat change of error
Amount is all larger than zero, according to degree of superheat tune valve principle it is found that expansion valve will execute the movement of valve opening.
As preferred embodiment, the not current return-air degree of superheat deviation of any increase and current return-air degree of superheat deviation
Variable quantity, but use and current return-air degree of superheat deviation and the relevant mode of current return-air degree of superheat change of error amount are increased
Greatly.Specifically, increasing current return-air degree of superheat deviation to more than zero as practical return-air degree of superheat deviation, increase current return-air
Degree of superheat change of error amount to more than zero is as practical return-air degree of superheat deviation, according to practical return-air degree of superheat deviation and practical time
The aperture of gas degree of superheat change of error amount adjustment expansion valve, comprising:
It takes the inclined absolute value of the difference of the current return-air degree of superheat to be used as practical return-air degree of superheat deviation, takes the current return-air degree of superheat inclined
The absolute value of poor variable quantity is used as practical return-air degree of superheat change of error amount, according to practical return-air degree of superheat deviation and practical return-air
The aperture of degree of superheat change of error amount adjustment expansion valve.
Using the control method of above-described embodiment, in air conditioner refrigerating operational process, if return-air degree of superheat deviation and return
Gas degree of superheat change of error amount is respectively less than zero, and if indoor environment temperature is higher at this time, is higher than setting indoor environment temperature, pressure
Contracting machine delivery temperature will be worked as nor less than setting delivery temperature by the current return-air degree of superheat deviation of increase to more than zero and increase
Preceding return-air degree of superheat change of error amount to more than zero mode are realized to return-air degree of superheat deviation and return-air degree of superheat change of error
The pass valve events for forcing expansion valve are become valve opening movement by the correction by the correction of amount, avoid inappropriate pass valve cause be
The decline of system runnability and the decline of temperature condition comfort, realize and adjust expansion valve opening with room temperature and compressor
The adaptivity of exhaust gas temperature change optimizes.
In air conditioner refrigerating operational process, it will be continually performed the deterministic process of step 11, step 12 and step 13, and such as
Fruit is unsatisfactory for degree of superheat condition, is perhaps unsatisfactory for temperature condition or two conditions are not satisfied, will be direct in the case of these
The process of the aperture according to current return-air degree of superheat deviation and current return-air degree of superheat change of error amount adjustment expansion valve is executed, and
It is adjusted without intervening, so that system is operated normally according to setting control mode.
Fig. 2 is referred to, which show the structural frames of control device one embodiment based on air-conditioning expansion valve of the present invention
Figure.
As schematically shown in Figure 2, which realizes structural 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, for obtaining return-air overheat according to the return-air degree of superheat and target superheat degree
Spend deviation.
Return-air degree of superheat change of error amount acquiring unit 207, for time 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, meet following degree of superheat conditions for judging whether: return-air degree of superheat deviation obtains
Take what current return-air degree of superheat deviation acquired in unit 206 and return-air degree of superheat change of error amount acquiring unit 207 obtained to work as
Preceding return-air degree of superheat change of error amount is respectively less than zero, and exports judging result.
Compressor exhaust temperature acquiring unit 209, for obtaining compressor exhaust temperature.
Temperature condition judgment unit 210 meets following temperature conditions for judging whether: including at least indoor environment temperature
Current indoor environment temperature acquired in acquiring unit 201 is spent not less than setting indoor environment temperature and compressor air-discharging temperature
Current compressor delivery temperature acquired in acquiring unit 209 is spent not less than setting delivery temperature, and exports judging result.
First adjusts valve cell 211, for meeting degree of superheat condition and temperature in the judgement of degree of superheat condition judgment unit 208
When the judgement of condition judgment unit 210 meets temperature condition, following tune valve processes is executed: it is inclined to increase the current return-air degree of superheat
Difference to more than zero increases the current return-air degree of superheat change of error amount to more than zero as practical return-air degree of superheat deviation, makees
For practical return-air degree of superheat deviation, according to the practical return-air degree of superheat deviation and the practical return-air degree of superheat change of error amount
Adjust the aperture of expansion valve.
In addition, control device further includes having the second tune valve cell, it is discontented for determining in degree of superheat condition judgment unit 208
When sufficient degree of superheat condition and/or the judgement of temperature condition judgment unit 210 are unsatisfactory for temperature condition, following tune valve processes is executed:
According to the aperture of current return-air degree of superheat deviation and current return-air degree of superheat change of error amount adjustment expansion valve.
The control device of above structure can be applied in the air-conditioning with expansion valve, each structural unit operation completion pair
The software program for answering function realizes the control to air-conditioning expansion valve according to the process of above-mentioned control method, reaches preceding method
Technical effect.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although referring to aforementioned reality
Applying example, invention is explained in detail, for those of ordinary skill in the art, still can be to aforementioned implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these are modified or replace
It changes, the spirit and scope for claimed technical solution of the invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of control method of air-conditioning expansion valve, which is characterized in that the described method includes:
Air conditioner refrigerating operation, obtain current indoor environment temperature, current compressor suction temperature, current compressor delivery temperature,
Current indoor coil temperature obtains the current goal degree of superheat 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
It states 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 temperature deviation and the previous moment at 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 temperature conditions: including at least the current indoor environment temperature not less than setting room
Interior environment temperature and the current compressor delivery temperature then execute following tune valve processes not less than setting delivery temperature:
Increase the current return-air degree of superheat deviation to more than zero, as practical return-air degree of superheat deviation, increases described current time
Gas degree of superheat change of error amount to more than zero, as practical return-air degree of superheat deviation, according to the practical return-air degree of superheat deviation
With the aperture of the practical return-air degree of superheat change of error amount adjustment expansion valve.
2. the method according to claim 1, wherein it is described increase the current return-air degree of superheat deviation to more than
Zero, as practical return-air degree of superheat deviation, increase the current return-air degree of superheat change of error amount to more than zero, is returned as practical
Gas degree of superheat deviation, according to the practical return-air degree of superheat deviation and the practical return-air degree of superheat change of error amount adjustment expansion
The aperture of valve, specifically includes:
It takes the inclined absolute value of the difference of the current return-air degree of superheat to be used as practical return-air degree of superheat deviation, takes the current return-air overheat
Spend change of error amount absolute value be used as practical return-air degree of superheat change of error amount, according to the practical return-air degree of superheat deviation with
The aperture of the practical return-air degree of superheat change of error amount adjustment expansion valve.
3. the method according to claim 1, wherein the indoor environment temperature that sets is 27 DEG C.
4. the method according to claim 1, wherein the setting delivery temperature protects temperature according to compressor air-discharging
Degree determines, and the setting delivery temperature is less than the compressor air-discharging and protects temperature.
5. method according to claim 1 to 4, which is characterized in that if being unsatisfactory for the degree of superheat condition
And/or be unsatisfactory for the temperature condition, then execute following tune valve processes:
According to the aperture of the current return-air degree of superheat deviation and the current return-air degree of superheat change of error amount adjustment expansion valve.
6. a kind of control device of air-conditioning expansion valve, comprising:
Compressor return air temperature acquiring unit, for obtaining compressor return air temperature；
Compressor exhaust temperature acquiring unit, for obtaining compressor exhaust temperature；
Target superheat degree acquiring unit, for obtaining target superheat degree according to compressor operating frequency；
Return-air degree of superheat deviation acquiring unit, for obtaining return-air overheat according to the return-air degree of superheat and the target superheat degree
Spend deviation；
Return-air degree of superheat change of error amount acquiring unit, for the return-air mistake according to the return-air degree of superheat deviation and previous moment
Temperature deviation obtains return-air degree of superheat change of error amount；
It is characterized in that, described device further include:
Indoor environment temperature acquiring unit, for obtaining indoor environment temperature；
Indoor coil pipe acquiring unit, for obtaining indoor coil pipe；
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；
Degree of superheat condition judgment unit, meet following degree of superheat conditions for judging whether: the return-air degree of superheat deviation obtains
It takes and works as acquired in current return-air degree of superheat deviation acquired in unit and the return-air degree of superheat change of error amount acquiring unit
Preceding return-air degree of superheat change of error amount is respectively less than zero, and exports judging result；
Temperature condition judgment unit meets following temperature conditions for judging whether: including at least the indoor environment temperature
Current indoor environment temperature acquired in acquiring unit is not less than setting indoor environment temperature and the compressor exhaust temperature
Current compressor delivery temperature acquired in acquiring unit exports judging result not less than setting delivery temperature；
First adjusts valve cell, for meeting the degree of superheat condition and the temperature in degree of superheat condition judgment unit judgement
When degree condition judgment unit judgement meets the temperature condition, following tune valve processes is executed: increasing the current return-air overheat
Spend deviation to more than zero, as practical return-air degree of superheat deviation, increase the current return-air degree of superheat change of error amount to more than
Zero, as practical return-air degree of superheat deviation, according to the practical return-air degree of superheat deviation and the practical return-air degree of superheat deviation
The aperture of variable quantity adjustment expansion valve.
7. device according to claim 6, which is characterized in that it is described increase the current return-air degree of superheat deviation to more than
Zero, as practical return-air degree of superheat deviation, increase the current return-air degree of superheat change of error amount to more than zero, is returned as practical
Gas degree of superheat deviation, according to the practical return-air degree of superheat deviation and the practical return-air degree of superheat change of error amount adjustment expansion
The aperture of valve, specifically includes:
It takes the inclined absolute value of the difference of the current return-air degree of superheat to be used as practical return-air degree of superheat deviation, takes the current return-air overheat
Spend change of error amount absolute value be used as practical return-air degree of superheat change of error amount, according to the practical return-air degree of superheat deviation with
The aperture of the practical return-air degree of superheat change of error amount adjustment expansion valve.
8. device according to claim 6, which is characterized in that the indoor environment temperature that sets is 27 DEG C.
9. device according to claim 6, which is characterized in that the setting delivery temperature protects temperature according to compressor air-discharging
Degree determines, and the setting delivery temperature is less than the compressor air-discharging and protects temperature.
10. device according to any one of claims 6 to 9, which is characterized in that described device further includes the second tune valve list
Member, for being unsatisfactory for the degree of superheat condition and/or temperature condition judgement in degree of superheat condition judgment unit judgement
Unit judgement executes following tune valve processes when being unsatisfactory for the temperature condition: according to the current return-air degree of superheat deviation and
The aperture of the current return-air degree of superheat change of error amount adjustment expansion valve.
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| CN109425069B (en) * | 2017-08-17 | 2021-06-04 | 宁波奥克斯电气股份有限公司 | Control method for electronic expansion valve during heating |
| CN108731211B (en) * | 2018-04-25 | 2020-12-29 | 武汉海尔电器股份有限公司 | Air conditioner and control method thereof |
| CN108709295B (en) * | 2018-05-28 | 2020-12-29 | 宁波奥克斯电气股份有限公司 | Protection control method for variable-frequency multi-connected air conditioning system |
| CN109341021A (en) * | 2018-09-27 | 2019-02-15 | 四川长虹电器股份有限公司 | A kind of air-conditioning built-in system and method carrying out humid control using the degree of superheat |
| CN111271814B (en) * | 2019-07-22 | 2021-08-31 | 宁波奥克斯电气股份有限公司 | Refrigerant flow control method and device and air conditioner |
| CN111023482A (en) * | 2019-11-26 | 2020-04-17 | 四川长虹空调有限公司 | Method for controlling electronic expansion valve based on asynchronous PD |
| CN113375319A (en) * | 2020-02-25 | 2021-09-10 | 青岛海尔空调电子有限公司 | Control method of fixed-frequency air conditioner in refrigeration state |
| CN111520868A (en) * | 2020-05-25 | 2020-08-11 | 广东志高暖通设备股份有限公司 | Indoor unit refrigerant distribution control method of multi-split system |
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