CN110986282A - Heat pump air conditioner frosting judgment method, computer readable storage medium and air conditioner - Google Patents
Heat pump air conditioner frosting judgment method, computer readable storage medium and air conditioner Download PDFInfo
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- CN110986282A CN110986282A CN201911154022.2A CN201911154022A CN110986282A CN 110986282 A CN110986282 A CN 110986282A CN 201911154022 A CN201911154022 A CN 201911154022A CN 110986282 A CN110986282 A CN 110986282A
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- frosting
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- air conditioner
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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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides a heat pump air conditioner frosting judgment method, a computer readable storage medium and an air conditioner. The current value is used as a frosting judgment condition, so that the frosting judgment is not easily influenced by the ambient temperature and humidity, whether frosting occurs or not can be judged more accurately, and the conditions such as judgment missing and misjudgment are prevented.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a heat pump air conditioner frosting judgment method, a computer readable storage medium and an air conditioner.
Background
In the heating operation process of the household split air conditioner, the outdoor unit is easy to generate frost at low temperature. The system must be switched to a refrigeration mode to defrost the heat exchanger of the outdoor unit after running for a period of time to ensure the normal running of the air conditioner, but how to judge whether the outdoor unit is frosted and whether the thickness of the frost layer is the most appropriate defrosting time is a difficult problem. The air conditioners in the prior art generally adopt the outdoor environment temperature and the outdoor coil temperature to jointly judge whether frost is formed, but due to the complexity of the environment temperature, the humidity and the like, the judgment method often has misjudgment or missed judgment, so that the condition of frost-free defrosting or frost layer accumulation occurs, and therefore a new and more reliable method is needed to judge the frost formation problem of the outdoor unit.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel heat pump air conditioner frosting judgment method, which effectively solves the problems that the conventional frosting judgment method has misjudgment or missed judgment, is slightly influenced by the ambient temperature and humidity and has high judgment accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for judging frosting of a heat pump air conditioner comprises the steps of detecting current of an outer fan motor in real time to obtain a real-time current value after starting up and heating, judging whether a frosting condition is met or not according to the difference between the real-time current value and the normal operation current value of the motor, further judging and analyzing the temperature of an outer pipe, judging that an outdoor heat exchanger is frosted when two judging conditions are met simultaneously, and further entering a defrosting mode. The current value is used as a frosting judgment condition, so that the frosting judgment is not easily influenced by the ambient temperature and humidity, whether frosting occurs or not can be judged more accurately, and the conditions such as judgment missing and misjudgment are prevented.
Further, the specific step of judging whether the frosting condition is met according to the difference between the real-time current value and the normal operation current value of the motor is as follows: detecting the current of the motor of the outer fan in real time to obtain a real-time current value I, and normally operating the motorThe line current value In is calculated, the current difference between the line current value In and the line current value In is △ I = I-In, and when the continuous Xmin meets △ I > △ IJudgment of frostingIf yes, judging that the frosting condition is met, wherein X is a preset time value, △ IJudgment of frostingJudging the current difference value for presetting the frost formation, if the current value is increased, indicating that the load of the motor is increased at the moment, the frost formation blocks the inlet air, and when the continuous Xmin meets △ I & gt △ IJudgment of frostingThe current load of the motor is increased, the frosting of the outdoor heat exchanger is indicated, the frosting judgment is more accurate through the current value, and the judgment accuracy is further increased by the additional continuous time judgment condition.
Further, the step of judging whether the frosting condition is met or not according to the difference between the real-time current value and the normal operation current value of the motor is specifically that the current of the motor of the outer fan is detected In real time to obtain a real-time current value I and a normal operation current value In of the motor, the current difference of △ I = I-In between the current value I and the normal operation current value In of the motor is calculated, and if the current difference does not meet the condition that continuous Xmin 36Judgment of frostingIf yes, judging that the frosting condition is not met, and continuously detecting the real-time current value, and if any time △ I is greater than △ I in the detected XminJudgment of frostingThe current of the outdoor heat exchanger may be increased due to other conditions, and the frosting of the outdoor heat exchanger cannot be judged, and the frosting may be generated.
Further, the judging and analyzing of the temperature of the outer tube specifically comprises: real-time detection of outer tube temperature TOuter tubeIf T isOuter tubeIf the temperature is lower than A ℃, judging that the frosting condition is met, wherein A is a preset temperature value. After the detection current value is judged, the temperature of the outer tube is further judged, and the detection reliability is improved.
Further, the judging and analyzing of the temperature of the outer tube specifically comprises: real-time detection of outer tube temperature TOuter tubeIf T isOuter tubeAnd if the temperature is more than or equal to A ℃, judging that the frosting condition is not met.
Further, after the defrosting is finished and the outer fan is started stably, detecting the current of the motor of the outer fan to obtain a current value Io, calculating a current difference value △ Io = Io-In by subtracting the current value In from the normal operation current value of the motor, and if the continuous Xmin meets the requirement that △ Io is more than △ IJudgment of frosting-△ITolerance errorThen judging the current outdoor heat exchangeAbnormal air intake state of the device, wherein △ ITolerance errorThe judgment method comprises the steps of judging whether the air inlet state of the outdoor heat exchanger is abnormal, judging whether defrosting is required to be conducted by adopting the method when the air inlet state of the outdoor heat exchanger is abnormal, and executing a defrosting judgment function when the outdoor heat exchanger is started next time, wherein after defrosting once, the defrosting state is determined to be a frostless state, if the current value is large in the state, the △ Io is close to the value for judging frosting, and the judgment that frosting is interfered due to the fact that the air inlet state of the current unit is abnormal due to other reasons is shown.
Further, after the defrosting is finished and the outer fan is started stably, detecting the current of the motor of the outer fan to obtain a current value Io, calculating a current difference value △ Io = Io-In by subtracting the current value In from the normal operation current value of the motor, and if the continuous Xmin meets the requirement that △ Io is less than or equal to △ IJudgment of frosting-△ITolerance errorAnd updating the normal running current value of the motor to be Io. The normal operation current value of the motor is updated so as to calculate the current change after frosting more accurately.
A computer-readable storage medium storing a computer program that when invoked by a processor implements the heat pump air conditioner frosting decision method of any of the above.
An air conditioner comprising a processor and a memory for storing a computer program that when invoked by the processor implements the heat pump air conditioner frosting decision method of any of the above.
The heat pump air conditioner frosting judgment method, the computer readable storage medium and the air conditioner provided by the invention have the beneficial effects that: the frosting degree is judged by utilizing the characteristics that the outdoor heat exchanger is blocked after frosting and the load of the fan is increased, the influence of the ambient temperature and humidity is avoided, the detection is more effective and reliable, whether frosting occurs can be judged more accurately, and the conditions such as judgment missing and misjudgment are prevented. .
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.
Example 1: a heat pump air conditioner frosting judgment method.
As shown in fig. 1, a method for judging frosting of a heat pump air conditioner includes the following steps:
and calculating or testing the current In of the external fan In normal operation In advance and the current value when the external fan is frosted to a certain degree, calculating the difference △ I between the current In and the current value, and recording the difference into the control module.
Firstly, after the heating operation time t1, starting to perform frosting judgment, continuously detecting the current I of the outer fan motor at the moment, calculating △ I = I-In, and when the continuous Xmin meets △ I > △ IJudgment of frosting， TOuter tubeIf the temperature is less than 0 ℃, the outdoor heat exchanger is considered to be frosted, and the defrosting state is entered at the moment.
Although the control is more reliable relative to single temperature judgment, due to uncontrollable external environment, the blockage of the heat exchanger of the external unit caused by other reasons is not eliminated, so that after one-time defrosting, abnormal judgment needs to be carried out in a frost-free state, and the subsequent misjudgment of defrosting is prevented.
After the outer fan is started stably, detecting the current of the motor of the outer fan to obtain a current value Io, calculating a current difference value △ Io = Io-In by taking the difference with the normal operation current value In of the motor, and if the continuous Xmin meets the requirement that △ Io is larger than △ IJudgment of frosting-△ITolerance errorIf the outdoor heat exchanger is in the normal state, the air inlet state of the outdoor heat exchanger is judged to be abnormal, and the defrosting judgment cannot be carried out by adopting the judgment method, so that the judgment function needs to be shielded, and the next starting is carried out. If the difference is not large, the In value is updated to I0 for more accurate calculation of the current change after frosting.
Wherein t1 is generally 20-40 min, depending on the configuration of the air conditioner;
x takes a value of 0.5-5 min;
△Ijudgment of frostingIt is recommended to use 10% to 30% of In depending on the motor performance.
In this embodiment, the steady current of the air conditioner is In =100mA, △ IJudgment of frosting=30mA，t1=25min，X=4min，△ITolerance error=5mA。
Detecting I =108mA at 25min after the air conditioner is started, and calculating that I-In =8mA < △ IJudgment of frostingIf I is detected to be 135mA at the moment of 40min, continuously judging, and calculating that I-In =35 mA > △ IJudgment of frostingHowever, the I is changed into 128mA In the next minute and does not last for 4min, the calculation is carried out again and recorded, the I is detected to be 135mA, 140mA, 138mA and 142mA respectively at the time of 50 min-53 min, and the I-In is calculated to be more than △ IJudgment of frostingAt this time TOuter tubeIf the temperature is less than 0 ℃ below zero and 5 ℃ below zero, the condition is met and defrosting is carried out.
After defrosting is finished, entering anti-misjudgment control, detecting Io at the moment after the external fan is restarted stably, wherein Io =102mA, Io-In =2mA is less than △ IJudgment of frosting-△ITolerance errorAnd judging whether the air inlet of the outdoor heat exchanger is abnormal, updating the current standard value In = Io =102mA, and continuing to judge frosting after △ I = I-102 mA.
Example 2: a computer readable storage medium.
A computer-readable storage medium storing a computer program that, when invoked by a processor, implements the heat pump air conditioner frosting decision method of embodiment 1.
Example 3: an air conditioner.
An air conditioner comprising a processor and a memory, the memory being configured to store a computer program that, when invoked by the processor, implements the heat pump air conditioner frosting decision method of embodiment 1.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.
Claims (9)
1. A heat pump air conditioner frosting judgment method is characterized in that after the air conditioner is started to perform heating operation, current of an outer fan motor is detected in real time to obtain a real-time current value, whether a frosting condition is met or not is judged according to the difference between the real-time current value and the normal operation current value of the motor, then the temperature of an outer pipe is judged and analyzed, when two judgment conditions are met simultaneously, an outdoor heat exchanger is judged to be frosted, and then a defrosting mode is started.
2. The method for judging frosting of heat pump air conditioner as claimed In claim 1, wherein said judging whether the frosting condition is satisfied by making difference between the real-time current value and the normal operation current value of the motor is specifically to detect the current of the motor of the external fan In real time to obtain the real-time current value I and the normal operation current value In of the motor, calculate the current difference between the real-time current value I and the normal operation current value In of the motor △ I = I-In, and when the continuous Xmin satisfies △ I > △ IJudgment of frostingIf yes, judging that the frosting condition is met, wherein X is a preset time value, △ IJudgment of frostingAnd judging the current difference value for the preset frosting.
3. The method for judging frosting of heat pump air conditioner as claimed In claim 1, wherein said judging whether the frosting condition is satisfied by making difference between the real-time current value and the normal operation current value of the motor comprises real-time detecting the current of the motor of the external fan to obtain the real-time current value I, and the normal operation current value In of the motor, calculating the current difference △ I = I-In, if not, continuously Xmin △ I > △ IJudgment of frostingAnd if so, judging that the frosting condition is not met, and continuously detecting the real-time current value.
4. The method for judging frosting of the heat pump air conditioner as claimed in claim 1, wherein the judging and analyzing the temperature of the outer tube specifically comprises: real-time detection of outer tube temperature TOuter tubeIf T isOuter tubeIf the temperature is lower than A ℃, judging that the frosting condition is met, wherein A is a preset temperature value.
5. The method for judging frosting of the heat pump air conditioner as claimed in claim 1, wherein the judging and analyzing the temperature of the outer tube specifically comprises: real-time detection of outer tube temperature TOuter tubeIf T isOuter tubeAnd if the temperature is more than or equal to A ℃, judging that the frosting condition is not met.
6. The method for judging frosting of the heat pump air conditioner as claimed In claim 1, wherein after the defrosting is finished and the external fan is started stably, the current of the motor of the external fan is detected to obtain a current value Io, the current value Io is calculated by subtracting the current value In of the normal operation of the motor, and a current difference value △ Io = Io-In is calculated, if the continuous Xmin meets △ Io > △ IJudgment of frosting-△ITolerance errorJudging that the current air inlet state of the outdoor heat exchanger is abnormal, wherein △ ITolerance errorIs a preset difference value.
7. The method for judging frosting of the heat pump air conditioner as claimed In claim 1, wherein after the defrosting is finished and the external fan is started stably, the current of the motor of the external fan is detected to obtain a current value Io, the current value Io is calculated by subtracting the current value In of the normal operation of the motor, and a current difference value △ Io = Io-In is calculated, if the continuous Xmin meets △ Io ≦ △ IJudgment of frosting-△ITolerance errorAnd updating the normal running current value of the motor to be Io.
8. A computer-readable storage medium storing a computer program, wherein the computer program, when being invoked by a processor, implements the heat pump air conditioner frosting decision method according to any one of claims 1 to 7.
9. An air conditioner comprising a processor and a memory for storing a computer program, wherein the computer program when invoked by the processor implements the heat pump air conditioner frosting decision method of any of claims 1-7.
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Cited By (3)
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| CN111426017A (en) * | 2020-05-12 | 2020-07-17 | 珠海格力电器股份有限公司 | Self-cleaning control method for outdoor heat exchanger of air conditioner, air conditioner and computer readable storage medium |
| CN112344622A (en) * | 2020-11-06 | 2021-02-09 | 中山市爱美泰电器有限公司 | Intelligent defrosting device of heat pump system and control method thereof |
| CN113847709A (en) * | 2021-11-01 | 2021-12-28 | 广东积微科技有限公司 | Outdoor unit defrosting control device and control method of air conditioner and air conditioner |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111426017A (en) * | 2020-05-12 | 2020-07-17 | 珠海格力电器股份有限公司 | Self-cleaning control method for outdoor heat exchanger of air conditioner, air conditioner and computer readable storage medium |
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| CN112344622B (en) * | 2020-11-06 | 2022-01-28 | 中山市爱美泰电器有限公司 | Intelligent defrosting device of heat pump system and control method thereof |
| CN113847709A (en) * | 2021-11-01 | 2021-12-28 | 广东积微科技有限公司 | Outdoor unit defrosting control device and control method of air conditioner and air conditioner |
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