CN114110920A - Control method of air conditioner and air conditioner - Google Patents
Control method of air conditioner and air conditioner Download PDFInfo
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- CN114110920A CN114110920A CN202111316258.9A CN202111316258A CN114110920A CN 114110920 A CN114110920 A CN 114110920A CN 202111316258 A CN202111316258 A CN 202111316258A CN 114110920 A CN114110920 A CN 114110920A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000007710 freezing Methods 0.000 claims abstract description 39
- 238000005057 refrigeration Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000007791 dehumidification Methods 0.000 claims abstract description 17
- 230000008014 freezing Effects 0.000 claims abstract description 13
- 229910052731 fluorine Inorganic materials 0.000 claims description 58
- 239000011737 fluorine Substances 0.000 claims description 58
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 57
- 239000003507 refrigerant Substances 0.000 claims description 20
- 230000002950 deficient Effects 0.000 claims description 15
- 230000007812 deficiency Effects 0.000 claims description 11
- 208000001034 Frostbite Diseases 0.000 claims description 8
- 108010053481 Antifreeze Proteins Proteins 0.000 claims description 5
- 230000002528 anti-freeze Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000004378 air conditioning Methods 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000005457 ice water Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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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
- F24F11/32—Responding to malfunctions or emergencies
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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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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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
- F24F11/43—Defrosting; Preventing freezing of indoor 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the field of air conditioners, in particular to a control method of an air conditioner, which comprises the following steps: acquiring real-time inner tube temperature in a refrigeration mode or a dehumidification mode of the air conditioner; real-time inner tube temperature T during first continuous timeInner pipe≤TPrevent freezing from enteringWhen the air conditioner is started, controlling the air conditioner to enter an anti-freezing protection program; inner tube temperature T at initial operating time in second continuous time0And real-time inner tube temperature TInner pipeDifference of difference
And the indoor ambient temperature TInner ringAnd real-time inner tube temperature TInner pipeDifference of difference
Controlling the air conditioner to enter a fluorine-lacking protection program; acquiring real-time inner tube temperature in the heating mode of the air conditioner, and obtaining the real-time inner tube temperature T when the real-time inner tube temperature T isInner pipe≥TOverload entryAnd controlling the air conditioner to enter an overload protection program. The invention can enter overload protection, anti-freezing protection and fluorine-lacking protection at proper time, improve the reliability of the air conditioner and prolong the service life of the air conditioner.
Description
Technical Field
The invention belongs to the field of air conditioners, and particularly relates to a control method of an air conditioner and the air conditioner
Background
Because the fixed-frequency air conditioner cannot adjust the frequency, the outdoor unit does not have a main control panel, a temperature sensing bulb and a pressure sensor, and the protection function of the air conditioner can only simply control the start and stop of a compressor and a fan. Because of the characteristics of economy, environmental protection and high efficiency, the R32 refrigerant air conditioner is more and more widely applied to the market. Compared with the R410A refrigerant, when the R32 refrigerant is used for heating, the temperature of the inner side evaporator is attenuated very fast, and after the high-temperature refrigerant at the inlet side passes through 1U, the temperature of the high-temperature refrigerant is attenuated by less than 50%, so that the high-temperature refrigerant is not beneficial to entering overload protection, and the unit is kept to operate under a high-pressure and high-load state for a long time, and the reliability of an air conditioner is damaged. At the moment, the inner tube temperature sensing bulb (temperature sensing bulb) of the evaporator needs to be selected at a position with higher temperature (the closer to a refrigerant inlet is, the better in a heating mode), so that the air conditioner can enter overload protection more quickly, and the overhigh pressure and temperature of the system are prevented. When the air conditioner is operated in a refrigeration mode, under the conditions of low-temperature high-humidity working conditions or filth blockage, an evaporator of an indoor unit is easy to frost and flow and uneven, and in order to timely enter anti-freezing protection and completely frost the evaporator, the temperature sensing bulb of the evaporator needs to be selected at a position with a lower temperature.
At present, the air conditioners of domestic brands all claim to have a fluorine-lacking protection function, the fluorine-lacking protection function is mainly judged according to the change of the temperature of a temperature sensing bag on an evaporator (under the normal full fluorine state, the temperature of an inner pipe of the evaporator can be reduced more after the evaporator is started to operate, when a system refrigerant leaks by more than 70%, an inner machine of the air conditioner does not have a refrigeration function any more, the temperature of the inner pipe of the evaporator can not be obviously reduced along with the operation of the air conditioner at the moment, and only small change can be caused), the outdoor environment temperature is higher, and the change of the temperature of the inner pipe of the evaporator is smaller. The air conditioner always has the phenomenon of trace leakage of the refrigerant in the use process of the air conditioner in the years, the temperature of an evaporator is extremely easy to overheat (the inlet is low and the outlet is high) under the conditions of high-temperature environment and reduced refrigerant, and at the moment, if the temperature sensing bulb is positioned at a higher temperature position, the air conditioner is extremely easy to cause fluorine-lacking protection shutdown and cause a great deal of after-sale complaints. In order to avoid the false alarm shutdown of the air conditioner in the normal use process, the temperature sensing bulb of the evaporator needs to be selected at a lower temperature position (the closer to the refrigerant inlet in the refrigeration mode, the better).
However, in the cooling and heating modes, the circulation directions of the refrigerant are opposite (i.e. the inlet of the refrigerant entering the evaporator during cooling is the outlet for heating), so that the indoor unit only uses 1 inner-tube thermal bulb, and overload protection, anti-freezing protection and fluorine-lacking protection logic based on the inner-tube thermal bulb are increasingly difficult to meet the requirement of air conditioner reliability. There is therefore a need for a simple and economical solution to this problem.
The present invention has been made in view of this situation.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art, and a first object of the present invention is to provide a control method of an air conditioner including an anti-freeze protection program, a fluorine-deficient protection program, and an overload protection program, the control method including:
acquiring real-time inner tube temperature in a refrigeration mode or a dehumidification mode of the air conditioner; real-time inner tube temperature T during first continuous timeInner pipe≤TPrevent freezing from enteringWhen the air conditioner is started, controlling the air conditioner to enter an anti-freezing protection program; inner tube temperature T at initial operating time in second continuous time0And real-time inner tube temperature TInner pipeDifference of difference T0-TInner pipe≤TLack of fluorine 1And indoor ambient temperature TInner ringAnd real-time inner tube temperature TInner pipeDifference of difference TInner ring-TInner pipe≤TLack of fluorine 2Controlling the air conditioner to enter a fluorine-lacking protection program;
acquiring real-time inner tube temperature in the heating mode of the air conditioner, and obtaining the real-time inner tube temperature T when the real-time inner tube temperature T isInner pipe≥TOverload entryAnd controlling the air conditioner to enter an overload protection program.
Further optionally, the air conditioner comprises a first thermal bulb and a second thermal bulb, and the first thermal bulb and the second thermal bulb are arranged on the indoor heat exchanger and used for detecting the temperature of the inner pipe; the control method further comprises the following steps:
before the anti-freezing protection program, the fluorine-lack protection program and the overload protection program are operated, whether a first temperature sensing bulb and a second temperature sensing bulb are in failure is detected;
when one of the first temperature sensing bulb and the second temperature sensing bulb is in fault and the other one is normal, the air conditioner acquires the temperature value of the normal temperature sensing bulb in a refrigeration mode, a dehumidification mode or a heating mode;
when the first temperature sensing bulb and the second temperature sensing bulb are both normal, the air conditioner acquires the minimum temperature value of the temperature values detected by the two temperature sensing bulbs in a refrigeration mode or a dehumidification mode; the air conditioner acquires the maximum temperature value in the temperature values detected by the two temperature sensing bags in the heating mode.
Further optionally, the first temperature sensing bulb is configured to detect a temperature of an inner tube at a refrigerant inlet, and the second temperature sensing bulb is configured to detect a temperature of the inner tube at a refrigerant outlet.
Further optionally, the air conditioner comprises a first thermal bulb and a second thermal bulb, the first thermal bulb is arranged on the indoor heat exchanger and used for detecting the temperature of the inner pipe, and the second thermal bulb is arranged on the outdoor heat exchanger and used for detecting the temperature of the outer pipe; the control method further comprises the following steps:
the air conditioner respectively obtains the real-time inner pipe temperature and the real-time outer pipe temperature in a refrigeration mode or a dehumidification mode, and when the temperature is in the second continuous time, the indoor environment temperature TInner ringAnd real-time inner tube temperature TInner pipeDifference of difference TInner ring-TInner pipe≤TLack of fluorine 2And satisfy the followingEntering fluorine-lacking protection under any one of the next two judgment conditions;
p1, inner tube temperature T at initial operating time0And real-time inner tube temperature TInner pipeDifference of difference T0-TInner pipe≤TLack of fluorine 1；
P2, real-time outer tube temperature TOuter tubeOuter tube temperature T from the initial operating time0' difference of
TOuter tube-T0’≤TLack of fluorine 3。
Further optionally, the anti-freeze protection procedure comprises:
controlling the compressor and the outdoor fan to stop running, and controlling the indoor fan to run at a first set rotating speed;
as real time inner tube temperature TInner pipe≥TPrevent frostbite and withdraw fromWhen the air conditioner is started, or the compressor stops running for the first set time, the air conditioner is controlled to quit the anti-freezing protection program, the original state running is recovered, and TPrevent frostbite and withdraw from＞TPrevent freezing from entering。
Further optionally, the fluorine deficient protection procedure comprises:
controlling the compressor to stop running, and controlling the indoor fan to run at a second set rotating speed;
after the compressor stops running for a second set time, the compressor is controlled to start running again, fluorine deficiency judgment is carried out again, and when the judgment condition for entering the fluorine deficiency protection program is met, the air conditioner is controlled to enter the fluorine deficiency protection program again;
and accumulating the times of entering the fluorine-lacking protection program, and when the times of continuously entering the fluorine-lacking protection program are more than or equal to the set times, controlling the air conditioner to stop and sending a fluorine-lacking prompt message to a user.
Further optionally, the overload protection program comprises:
controlling the outdoor fan to stop running when the real-time inner tube temperature TInner pipe＜TOverload exitWhen the air conditioner is in the overload protection program, the outdoor fan is controlled to return to the original state to operate, and TOverload exit＜TOverload entry。
A second object of the present invention is to provide a control apparatus of an air conditioner, which includes one or more processors and a non-transitory computer-readable storage medium storing program instructions, the one or more processors being configured to implement the method according to any one of the above when the one or more processors execute the program instructions.
A third object of the invention proposes a non-transitory computer-readable storage medium having stored thereon program instructions for implementing the method according to any one of the above when the program instructions are executed by one or more processors.
A fourth object of the present invention is to provide an air conditioner, which employs any one of the methods described above, or includes the control device described above, or has the non-transitory computer-readable storage medium described above.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the control method of the air conditioner and the air conditioner can timely enter overload protection when the air conditioner heats in a high-temperature environment, reduce the system pressure and the exhaust temperature, improve the reliability of the air conditioner and prolong the service life of the air conditioner. When the refrigeration is carried out in a low-temperature environment, the internal machine can enter anti-freezing protection in time, so that the evaporator of the internal machine is defrosted completely, and ice water is prevented from falling into a room to cause after-sale complaints; when the air conditioner is used for refrigerating in a high-temperature environment, the phenomenon that an internal machine is mistakenly reported and lacks fluorine to protect the machine from being shut down is avoided, so that the air conditioner can normally run and has a refrigerating effect.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1: the control flow chart of the air conditioner in the refrigeration mode or the dehumidification mode is shown in the embodiment of the invention;
FIG. 2: is the control flow chart of the heating mode of the air conditioner of the embodiment of the invention;
FIG. 3: is a control system diagram of an air conditioner of an embodiment of the invention;
FIG. 4: is a control flow chart of a specific implementation of the air conditioner of the embodiment of the invention.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "contacting," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Because the traditional household constant-frequency air conditioner indoor unit at present only has one evaporator inner pipe temperature sensing bulb and one environment temperature sensing bulb, the outdoor unit has no temperature sensing bulb. The environment temperature sensing bulb detects indoor environment temperature, and the main effect is when indoor environment temperature reaches user's settlement temperature, and the master controller controls the compressor and opens and stop in order to maintain the temperature in room. The inner pipe temperature sensing bulb on the evaporator detects the pipe temperature of the evaporator, and provides a basis for overload protection during heating of the air conditioner, anti-freezing protection during refrigeration and fluorine-lacking protection. Because the refrigerant circulation directions are opposite during refrigeration and heating, the requirements for the positions of the inner pipe temperature-sensing bulbs are different, and all reliability protection logics are difficult to simultaneously meet by fixing one temperature-sensing bulb. Therefore, in order to enable the fixed-frequency air conditioner to enter overload protection in time, reduce the system pressure and the exhaust temperature, enable the inner unit to enter anti-freezing protection in time when the air conditioner is cooled in a low-temperature environment, enable the evaporator of the inner unit to defrost completely, prevent ice water from falling into a room, and avoid the false alarm and fluorine shortage protection shutdown of the inner unit when the air conditioner is cooled in a high-temperature environment, so that the air conditioner can normally operate and has a cooling effect, the embodiment provides the control method of the air conditioner.
The control method of the embodiment is written into the main controller as a program, once the air conditioner is started, the program can detect and read the data of the temperature sensing bulb in real time, and the judgment and the action are carried out according to the logic of the control method. The temperature and time parameters related to the embodiment may be fixed values, written in a control program, covering all household air conditioners, or may be variables, and specific parameters are set for specific air conditioning systems
The air conditioner of the present embodiment includes an anti-freeze protection routine, a fluorine-deficient protection routine, and an overload protection routine. The control method of the embodiment comprises the following steps:
for an anti-freezing protection program, as shown in a flow chart of fig. 1, the real-time inner tube temperature is obtained in a refrigeration mode or a dehumidification mode of an air conditioner; real-time inner tube temperature T during first continuous timeInner pipe≤TPrevent freezing from enteringWhen the air conditioner is started, controlling the air conditioner to enter an anti-freezing protection program;
in this embodiment, in the cooling or dehumidifying mode, the freeze release protection program is automatically entered, and the temperature of entering the freeze protection program is TPrevent freezing from enteringThe freezing prevention exit temperature is TPrevent frostbite and withdraw fromWherein T isPrevent frostbite and withdraw from＞0＞TPrevent freezing from entering. Since the frosting of the internal evaporator is a process requiring a cumulative time, it is necessary to detect the temperature T during the first continuous timeInner pipe≤TPrevent freezing from enteringThe air conditioner can enter the anti-freezing protection and the inner machine is evaporatedThe hair dryer performs defrosting. At the moment, the compressor and the outdoor fan are controlled to stop running, the indoor fan is controlled to run at a first set rotating speed, when the evaporator is not frosted, the temperature of the inner pipe is inevitably greater than 0 ℃, and the temperature T is controlled to be higher than 0 DEG CPrevent frostbite and withdraw fromIs a value greater than 0 deg.C when T is detected in real timeInner pipe≥TPreventing freezing outThe anti-freezing protection can be quitted. In addition, when the compressor stops, the internal machine evaporator has no cold source, the frosting state can not be maintained for too long, and the compressor can be judged to exit the anti-freezing protection after stopping running for the first set time. And when the air conditioner exits the anti-freezing protection program, the air conditioner restores to the original state to operate.
For the fluorine-deficient protection program, as shown in the flowchart of fig. 1, the real-time inner tube temperature is obtained in the refrigeration mode or dehumidification mode of the air conditioner; inner tube temperature T at initial operating time in second continuous time0And real-time inner tube temperature TInner pipeDifference of difference T0-TInner pipe≤TLack of fluorine 1And indoor ambient temperature TInner ringAnd real-time inner tube temperature TInner pipeDifference of difference TInner ring-TInner pipe≤TLack of fluorine 2Controlling the air conditioner to enter a fluorine-lacking protection program;
in this embodiment, the fluorine-deficient protection program is automatically entered in the cooling or dehumidifying mode. Therefore, the temperature T of the inner tube at the moment of starting up needs to be recorded0Real-time inner tube temperature T after a period of operationInner pipeSince the change in the temperature of the inner tube is also a time-consuming process, the temperature T of the inner tube is detected in a second continuous time0-TInner pipe≤TLack of fluorine 1And T isInner ring-TInner pipe≤TLack of fluorine 2The air conditioner is judged to enter the first fluorine-lacking protection. At the moment, the compressor is controlled to stop running, and the indoor fan is controlled to run at a second set rotating speed; if the fluorine-deficient protection is only started once, a fault code is reported, false complaints are easy to appear after sale, the compressor is controlled to start again to operate after the operation stop time of the first fluorine-deficient protection control compressor is longer than or equal to the second set time, fluorine deficiency judgment is carried out again, and when the judgment condition of entering the fluorine-deficient protection program is met, the air conditioner is controlled to enter the fluorine-deficient protection program again;and accumulating the times of entering the fluorine-lacking protection program, controlling the air conditioner to stop when the times of continuously entering the fluorine-lacking protection program is more than or equal to the set times, stopping all loads (an indoor fan, an outdoor fan and a compressor) and sending a fluorine-lacking prompt message to a user, wherein if an internal machine reports a fault code to remind the user.
For overload protection, as shown in the flow chart of fig. 2, in the heating mode of the air conditioner, the real-time inner tube temperature is obtained, and when the real-time inner tube temperature T is reachedInner pipe≥TOverload entryAnd controlling the air conditioner to enter an overload protection program.
In this embodiment, the air conditioner automatically enters the overload protection program in the heating mode. Setting TOverload entryFor protection against overload of the entering temperature, TOverload exitTemperature for overload protection exit, TOverload entry＞TOverload exit. When the temperature T of the inner tube is detectedInner pipe≥TOverload entryWhen the air conditioner enters overload protection, the outdoor fan stops running at the moment, and when the temperature T of the inner pipe is detectedInner pipe≤TOverload exitAnd when the air conditioner is in overload protection, the outdoor fan is recovered to operate in the original state. The pressure and temperature changes of the air conditioning system are accumulated processes, so that the air conditioning system can enter the air conditioning system only by detecting that the temperature of the inner pipe meets the conditions in real time.
Further optionally, in order to avoid inaccurate judgment of the entry time of entering the anti-freezing protection program, entering the fluorine-lacking program and entering the overload protection program due to only one temperature sensing bulb being arranged in the indoor unit of the air conditioner to detect the temperature of the inner pipe, as shown in a control system diagram of the air conditioner shown in fig. 3, the air conditioner of the embodiment includes a first temperature sensing bulb and a second temperature sensing bulb, and the first temperature sensing bulb and the second temperature sensing bulb are arranged on the indoor heat exchanger and are used for detecting the temperature of the inner pipe; the two temperature sensing bulbs can be arranged at different positions in the same flow path or in different flow paths. In order to make the inner tube temperatures detected by the two temperature sensing bulbs different, the first temperature sensing bulb is preferably used for detecting the inner tube temperature at the refrigerant inlet, and the second temperature sensing bulb is preferably used for detecting the inner tube temperature at the refrigerant outlet.
Before the anti-freezing protection program, the fluorine-lack protection program and the overload protection program are operated, whether a first temperature sensing bulb and a second temperature sensing bulb are in failure is detected; when one of the first temperature sensing bulb and the second temperature sensing bulb is in fault and the other one is normal, the air conditioner acquires the temperature value of the normal temperature sensing bulb in a refrigeration mode, a dehumidification mode or a heating mode; when the first temperature sensing bulb and the second temperature sensing bulb are both normal, the air conditioner acquires the minimum temperature value of the temperature values detected by the two temperature sensing bulbs in a refrigeration mode or a dehumidification mode; the air conditioner acquires the maximum temperature value in the temperature values detected by the two temperature sensing bags in the heating mode.
In the embodiment, after the air conditioner is started, whether the first temperature-sensing bulb and the second temperature-sensing bulb which detect the temperature of the inner pipe are in fault or not is detected in real time, and if no fault exists, the judgment of the running mode of the air conditioner is carried out; if one temperature sensing bulb has a fault, reading the temperature data of the normal temperature sensing bulb as the judgment parameters of the freezing prevention protection, the fluorine lack protection and the overload protection of the air conditioner; if both temperature sensing bags have faults, stopping the machine for processing, and reporting fault codes. When the two temperature sensing bags are normal, when the air conditioner is used for refrigerating or dehumidifying, in order to ensure that the evaporator can be defrosted completely, the temperature value detected by the two temperature sensing bags of the evaporator needs to be a small value, TInner pipeTaking min (T1, T2), T1 and T2 as temperature values respectively obtained by the two temperature sensing bags at the same time, comparing the numerical values of the two temperature sensing bags in real time by a program, and taking a small value as a temperature condition for judging entering the anti-freezing protection. When the air conditioner is used for refrigerating or dehumidifying, in order to avoid the situation that an internal machine is mistakenly reported and lacks fluorine to protect the machine to stop, the air conditioner can normally run and has a refrigerating effect, the temperature values detected by two temperature sensing bags of an evaporator need to be small, and T is a small valueInner pipeTaking min (T1, T2), T1 and T2 as temperature values respectively obtained by the two temperature sensing bulbs at the same time, comparing the numerical values of the two temperature sensing bulbs in real time by a program, and taking a small value as a temperature condition for judging entering fluorine-lacking protection. When the air conditioner heats, the indoor unit belongs to a high-pressure side, two temperature sensing bags of the evaporator need to take a large value T in order to enter overload protection in time under a high-temperature environmentInner pipeTaking max (T1, T2), T1 and T2 as temperature values respectively obtained by the two temperature sensing bags at the same time, and comparing the two temperature sensing bags in real time by the programThe value of (2) is taken as the temperature condition for judging the entering of overload protection.
This embodiment is through using two temperature sensing package at the quick-witted evaporimeter including, effectively utilizes these two temperature sensor, promotes the reliability problem of air conditioner by a wide margin, improves after-sale user experience. Meanwhile, after one temperature sensing bulb fails, the temperature sensing bulb system is switched to a single temperature sensing bulb system, the air conditioner can be kept to be started normally to operate, and the failure rate is reduced.
As shown in the control flowchart of fig. 4, the control method of the present embodiment includes:
firstly, in an air conditioner operation refrigeration or dehumidification mode, reading the temperature data of two temperature sensing bags in real time and taking a small value, TInner pipeTaking min (T1, T2):
when T is detected in the first continuous timeInner part≤TPrevent freezing from enteringWhen the temperature is high, the air conditioner enters anti-freezing protection, the compressor and the outdoor fan stop running at the moment, and the indoor fan runs at a first set rotating speed;
② when detecting the temperature T of the coilInner pipe≥TPrevent frostbite and withdraw fromAnd when the temperature is high, or the shutdown running time of the compressor is more than or equal to the first set time, the anti-freezing protection is quitted, and the running in the original state is recovered.
And thirdly, the air conditioner still detects the temperature of the inner pipe in real time, and if the temperature meets the entering condition of the anti-freezing protection, the air conditioner can enter the anti-freezing protection again.
Secondly, in the air conditioner operation refrigeration or dehumidification mode, the temperature data of the two temperature sensing bags are read in real time and the small value, TInner pipeTaking min (T1, T2):
firstly, recording the temperature T of the coil pipe at the moment of starting up the air conditioner when starting up the air conditioner0After a period of operation, the coil temperature T is detected for a second continuous period of time0-TInner pipe≤TLack of fluorine 1And T isInner ring-T≤TLack of fluorine 2And the air conditioner is judged to enter the first fluorine-lacking protection, the compressor stops running at the moment, and the inner fan runs at a second set rotating speed.
Secondly, the operation stopping time of the compressor is protected to be not less than the second set time by lacking fluorine for the first time, the compressor is started to operate again, and after a period of time, the judgment condition of lacking fluorine is entered again
And thirdly, when the number of times of entering the fluorine-lacking protection is continuously detected to be more than or equal to the set number of times, all loads (the indoor motor, the outdoor motor and the compressor) are stopped, and the indoor motor reports a fault code to remind a user. If the condition of not less than the set times is not satisfied, the fluorine-lacking protection is quitted.
Third, air conditioner operation heating mode
Reading the temperature data of two coil temperature sensors in real time and taking a large value TInner pipeMax (T1, T2)
② when detecting that the temperature T of the coil pipe is more than or equal to TOverload entryWhen the air conditioner enters overload protection, the outdoor motor stops running
Thirdly, when the temperature T of the coil pipe is detected to be less than or equal to TOverload exitAnd when the air conditioner is in overload protection, the outdoor motor is recovered to operate in the original state.
At the moment, the air conditioner still detects the temperature of the inner pipe in real time, and if the temperature meets the overload protection entering condition, the air conditioner can enter overload protection again.
As an alternative to entering the fluorine-deficient protection, this embodiment may further add a thermal bulb to the outdoor condenser for detecting the temperature of the outer tube of the outdoor condenser. When the fluorine leakage of the air conditioner reaches more than 70 percent, the indoor unit has little refrigeration effect, namely the heat exchange of the evaporator of the indoor unit is very weak, the heat exchange effect of the condenser of the same outdoor unit is also very weak, which shows that the temperature change of the outer pipe of the condenser is not large, and the defect of the temperature sensing bulb of the single indoor unit is overcome by detecting the temperature change value of the outer pipe of the outdoor unit and adding the logic of fluorine deficiency protection.
Specifically, the air conditioner of the embodiment includes a first thermal bulb and a second thermal bulb, the first thermal bulb is arranged on the indoor heat exchanger and used for detecting the temperature of the inner pipe, and the second thermal bulb is arranged on the outdoor heat exchanger and used for detecting the temperature of the outer pipe; the control method further comprises the following steps:
the air conditioner respectively obtains the real-time inner pipe temperature and the real-time outer pipe temperature in a refrigeration mode or a dehumidification mode, and when the temperature is in the second continuous time, the indoor environment temperature TInner ringAnd real-time inner tube temperature TInner pipeDifference of difference TInner ring-TInner pipe≤TLack of fluorine 2Then, entering fluorine-lacking protection when any one of the following two judgment conditions is met; when the following two conditions are not met, the protection of lacking fluorine is not entered. These two conditions are P1 and P2, respectively, wherein:
p1, inner tube temperature T at initial operating time0And real-time inner tube temperature TInner pipeDifference of difference T0-TInner pipe≤TLack of fluorine 1；
P2, real-time outer tube temperature TOuter tubeOuter tube temperature T from the initial operating time0' Difference of values TOuter tube-T0’≤TLack of fluorine3。
In this embodiment, the fluorine-deficient protection program is automatically entered in the cooling or dehumidifying mode. Under the condition of fluorine deficiency, the temperature change of the inner tube temperature of the evaporator and the temperature change of the outer tube of the condenser are small, so that the judgment of the fluorine deficiency can be carried out only by combining one of the inner tube temperature and the outer tube temperature with the ambient temperature.
Specifically, the temperature T of the inner tube at the moment of starting up is recorded0Real-time inner tube temperature T after a period of operationInner pipeAnd recording the temperature T of the outer tube at the moment of starting0', real-time outer tube temperature T after a period of operationOuter tubeSince the change in the temperature of the inner and outer tubes is also a time-consuming process, the temperature T of the inner tube is detected in a second continuous time0-TInner pipe≤TLack of fluorine 1And T isInner ring-TInner pipe≤TLack of fluorine 2The air conditioner is judged to enter the first fluorine-lacking protection. Alternatively, the outer tube temperature T is sensed for a second continuous timeOuter tube-T0’≤TLack of fluorine 3And T isInner ring-TInner pipe≤TLack of fluorine 2The air conditioner is judged to enter the first fluorine-lacking protection. At the moment, the compressor is controlled to stop running, and the indoor fan is controlled to run at a second set rotating speed; if the fault code is reported only by entering the fluorine-deficient protection for one time, false complaints are easy to appear after sale, the compressor is controlled to start again to operate after the operation stopping time of the first fluorine-deficient protection control compressor is longer than or equal to the second set time, and the fluorine-deficient judgment is carried out again,when the judgment condition for entering the fluorine-lacking protection program is met, controlling the air conditioner to enter the fluorine-lacking protection program again; and accumulating the times of entering the fluorine-lacking protection program, controlling the air conditioner to stop when the times of continuously entering the fluorine-lacking protection program is more than or equal to the set times, stopping all loads (an indoor fan, an outdoor fan and a compressor) and sending a fluorine-lacking prompt message to a user, wherein if an internal machine reports a fault code to remind the user. .
The present embodiment also proposes a control device of an air conditioner, which includes one or more processors and a non-transitory computer-readable storage medium storing program instructions, when the one or more processors execute the program instructions, the one or more processors are configured to implement the method according to any one of the above.
The present embodiments also propose a non-transitory computer-readable storage medium having stored thereon program instructions for implementing the method according to any one of the above when the program instructions are executed by one or more processors.
The embodiment also provides an air conditioner which adopts the method of any one of the above items, or comprises the control device or has the non-transitory computer readable storage medium. Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A control method of an air conditioner, wherein the air conditioner includes an anti-freeze protection program, a fluorine-deficient protection program, and an overload protection program, the control method comprising:
acquiring real-time inner tube temperature in a refrigeration mode or a dehumidification mode of the air conditioner; real-time inner tube temperature T during first continuous timeInner pipe≤TPrevent freezing from enteringWhen the air conditioner is started, controlling the air conditioner to enter an anti-freezing protection program; inner tube temperature T at initial operating time in second continuous time0And real-time inner tube temperature TInner pipeDifference of difference T0-TInner pipe≤TLack of fluorine 1And indoor ambient temperature TInner ringAnd real-time inner tube temperature TInner pipeDifference of difference TInner ring-TInner pipe≤TLack of fluorine 2Controlling the air conditioner to enter a fluorine-lacking protection program;
acquiring real-time inner tube temperature in the heating mode of the air conditioner, and obtaining the real-time inner tube temperature T when the real-time inner tube temperature T isInner pipe≥TOverload entryAnd controlling the air conditioner to enter an overload protection program.
2. The control method of an air conditioner according to claim 1, wherein the air conditioner comprises a first bulb and a second bulb, the first bulb and the second bulb are arranged on an indoor heat exchanger for detecting the temperature of an inner pipe; the control method further comprises the following steps:
before the anti-freezing protection program, the fluorine-lack protection program and the overload protection program are operated, whether a first temperature sensing bulb and a second temperature sensing bulb are in failure is detected;
when one of the first temperature sensing bulb and the second temperature sensing bulb is in fault and the other one is normal, the air conditioner acquires the temperature value of the normal temperature sensing bulb in a refrigeration mode, a dehumidification mode or a heating mode;
when the first temperature sensing bulb and the second temperature sensing bulb are both normal, the air conditioner acquires the minimum temperature value of the temperature values detected by the two temperature sensing bulbs in a refrigeration mode or a dehumidification mode; the air conditioner acquires the maximum temperature value in the temperature values detected by the two temperature sensing bags in the heating mode.
3. The method as claimed in claim 2, wherein the first bulb is used to detect a temperature of an inner tube at a refrigerant inlet, and the second bulb is used to detect a temperature of an inner tube at a refrigerant outlet.
4. The control method of an air conditioner according to claim 1, wherein the air conditioner includes a first bulb provided on an indoor heat exchanger for detecting an inner tube temperature and a second bulb provided on an outdoor heat exchanger for detecting an outer tube temperature; the control method further comprises the following steps:
the air conditioner respectively obtains the real-time inner pipe temperature and the real-time outer pipe temperature in a refrigeration mode or a dehumidification mode, and when the temperature is in the second continuous time, the indoor environment temperature TInner ringAnd real-time inner tube temperature TInner pipeDifference of difference TInner ring-TInner pipe≤TLack of fluorine 2Then, entering fluorine-lacking protection when any one of the following two judgment conditions is met;
p1, inner tube temperature T at initial operating time0And real-time inner tube temperature TInner pipeDifference of difference T0-TInner pipe≤TLack of fluorine 1；
P2, real-time outer tube temperature TOuter tubeOuter tube temperature T from the initial operating time0' difference of
TOuter tube-T0’≤TLack of fluorine 3。
5. The control method of an air conditioner according to claim 5, wherein the anti-freeze protection program includes:
controlling the compressor and the outdoor fan to stop running, and controlling the indoor fan to run at a first set rotating speed;
as real time inner tube temperature TInner pipe≥TPrevent frostbite and withdraw fromWhen the air conditioner is started, or the compressor stops running for the first set time, the air conditioner is controlled to quit the anti-freezing protection program, the original state running is recovered, and TPrevent frostbite and withdraw from＞TPrevent freezing from entering。
6. The control method of an air conditioner according to claim 6, wherein the fluorine deficiency protection program includes:
controlling the compressor to stop running, and controlling the indoor fan to run at a second set rotating speed;
after the compressor stops running for a second set time, the compressor is controlled to start running again, fluorine deficiency judgment is carried out again, and when the judgment condition for entering the fluorine deficiency protection program is met, the air conditioner is controlled to enter the fluorine deficiency protection program again;
and accumulating the times of entering the fluorine-lacking protection program, and when the times of continuously entering the fluorine-lacking protection program are more than or equal to the set times, controlling the air conditioner to stop and sending a fluorine-lacking prompt message to a user.
7. The control method of an air conditioner according to claim 1, wherein the overload protection program includes:
controlling the outdoor fan to stop running when the real-time inner tube temperature TInner pipe＜TOverload exitWhen the air conditioner is in the overload protection program, the outdoor fan is controlled to return to the original state to operate, and TOverload exit＜TOverload entry。
8. A control apparatus of an air conditioner, comprising one or more processors and a non-transitory computer readable storage medium storing program instructions, the one or more processors being configured to implement the method according to any one of claims 1 to 8 when the program instructions are executed by the one or more processors.
9. A non-transitory computer-readable storage medium having stored thereon program instructions which, when executed by one or more processors, are to implement the method of any one of claims 1-8.
10. An air conditioner, characterized in that it employs the method of any one of claims 1-8, or comprises the control device of claim 9, or has a non-transitory computer-readable storage medium according to claim 10.
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