CN105241017A - Air conditioner system and frequency control method of air conditioner compressor - Google Patents
Air conditioner system and frequency control method of air conditioner compressor Download PDFInfo
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- CN105241017A CN105241017A CN201510708694.9A CN201510708694A CN105241017A CN 105241017 A CN105241017 A CN 105241017A CN 201510708694 A CN201510708694 A CN 201510708694A CN 105241017 A CN105241017 A CN 105241017A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000013507 mapping Methods 0.000 claims description 40
- 238000004378 air conditioning Methods 0.000 claims description 34
- 239000003507 refrigerant Substances 0.000 claims description 10
- 238000005057 refrigeration Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 20
- 238000001816 cooling Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000005494 condensation Effects 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Classifications
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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
- F24F2110/20—Humidity
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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
-
- 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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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a frequency control method of an air conditioner compressor. The method comprises the steps that whether an air conditioner is in a low air volume state or not is judged; when the air conditioner is in the low air volume state, the temperature of the indoor environment of the air conditioner is obtained; the humidity of the indoor temperature of the air conditioner is obtained; and the maximum running frequency of the air conditioner compressor is controlled to be the frequency value corresponding to the temperature of the indoor environment and the humidity of the indoor environment according to the temperature of the indoor environment and the humidity of the indoor environment. The invention further discloses an air conditioner system. Generation of condensate water can be avoided, and meanwhile the comfort of users can be guaranteed.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioning system and a frequency control method of an air conditioner compressor.
Background
In the refrigerating use process of the air conditioner in summer, cold air and hot air are intersected at the air outlet, so that condensation is easily generated at the air outlet when the relative humidity of the air is high. After condensed water is produced, the condensed water is easy to drip at the positions of an air outlet, an air guide strip and the like or blow out along with air supply. The dropping or blowing of the condensed water can damage furniture, wet clothes and the like, and bring troubles to consumers.
In the prior art, the problem is generally solved by adopting a method of sweeping wind or reducing the running frequency of a compressor of the air conditioner, but the problem of condensation cannot be completely solved by sweeping wind, and although the reduction of the frequency is feasible, the refrigerating capacity of the air conditioner is also reduced, and the comfort is sacrificed. Therefore, a compressor frequency control scheme that can solve the condensation problem and ensure comfort is needed.
Disclosure of Invention
The invention mainly aims to provide a frequency control method for adjusting an air conditioner compressor and an air conditioning system, and aims to solve the problem of condensation and ensure comfort.
In order to achieve the above object, the present invention provides a frequency control method for an air conditioner compressor, wherein the air conditioner operates in a cooling mode, and the frequency control method for the air conditioner compressor comprises the following steps;
judging whether the air conditioner is in a low air volume state or not;
when the air conditioner is in a low air volume state, acquiring the indoor environment temperature of the air conditioner;
acquiring the indoor environment humidity of the air conditioner;
and controlling the maximum operating frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to the indoor environment temperature and the indoor environment humidity.
Preferably, the indoor ambient humidity is an indoor relative humidity;
the step of controlling the frequency of the air conditioner compressor to operate at a frequency value corresponding to the indoor environment and the indoor environment humidity according to the indoor environment temperature and the indoor environment humidity comprises the following steps:
calculating to obtain indoor absolute humidity according to the indoor environment temperature and the indoor relative humidity;
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor absolute humidity according to the mapping relation between the preset indoor absolute humidity and the compressor frequency.
Preferably, the step of controlling the maximum operating frequency of the air conditioner compressor to be a frequency value corresponding to the indoor ambient temperature and the indoor ambient humidity according to the indoor ambient temperature and the indoor ambient humidity includes:
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to a preset mapping relation between the compressor frequency and the indoor environment temperature and the indoor environment humidity.
Preferably, the mapping relationship between the preset compressor frequency and the indoor environment temperature and the indoor humidity is a corresponding relationship among the compressor frequency, a preset indoor temperature interval and a preset indoor humidity interval;
the step of controlling the maximum operating frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to the preset mapping relationship between the compressor frequency and the indoor environment temperature and the indoor environment humidity comprises the following steps:
obtaining an indoor temperature interval where the indoor environment temperature is located according to the indoor environment temperature;
obtaining an indoor humidity interval where the indoor environment humidity is located according to the indoor environment humidity;
and obtaining frequency values corresponding to the indoor temperature interval and the indoor humidity interval, and controlling the maximum operation frequency of the air conditioner compressor to be the frequency value.
Preferably, the judging whether the air conditioner is in the low air volume state includes:
judging whether the rotating speed of the indoor fan of the air conditioner is lower than a preset wind speed threshold value or not;
and when the rotating speed of the indoor fan of the air conditioner is lower than a preset wind speed threshold value, judging that the air conditioner is in a low wind volume state.
In addition, in order to achieve the above object, an embodiment of the present invention further provides an air conditioning system, which includes a compressor, an evaporator, a condenser, an indoor fan, and a refrigerant loop formed by connecting the compressor, the evaporator, and the condenser in series, and the air conditioning system further includes a temperature sensor, a humidity sensor, and a controller; wherein,
the temperature sensor is used for acquiring the indoor environment temperature of the air conditioner when the air conditioner is in a low air volume state;
the humidity sensor is used for acquiring the indoor environment humidity of the air conditioner;
the controller is used for controlling the maximum operation frequency of the air conditioner compressor to be frequency values corresponding to the indoor environment temperature and the indoor environment humidity according to the indoor environment temperature and the indoor environment humidity when the air conditioner system operates in a refrigeration mode and the air conditioner is in a low air volume state.
Preferably, the humidity sensor is used for acquiring indoor relative humidity of the air conditioner;
the controller is configured to:
calculating to obtain indoor absolute humidity according to the indoor environment temperature and the indoor relative humidity;
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor absolute humidity according to the mapping relation between the preset indoor absolute humidity and the compressor frequency.
Preferably, the controller is configured to:
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to a preset mapping relation between the compressor frequency and the indoor environment temperature and the indoor environment humidity.
Preferably, the mapping relationship between the preset compressor frequency and the indoor environment temperature and the indoor humidity is a corresponding relationship among the compressor frequency, a preset indoor temperature interval and a preset indoor humidity interval; the controller is configured to:
obtaining an indoor temperature interval where the indoor environment temperature is located according to the indoor environment temperature;
obtaining an indoor humidity interval where the indoor environment humidity is located according to the indoor environment humidity;
and obtaining frequency values corresponding to the indoor temperature interval and the indoor humidity interval, and controlling the maximum operation frequency of the air conditioner compressor to be the frequency value.
Preferably, the controller is configured to:
acquiring the rotating speed of the indoor fan;
and when the rotating speed of the indoor fan of the air conditioner is lower than a preset wind speed threshold value, judging that the air conditioner is in a low wind volume state.
In the invention, when the air conditioner is operated in a refrigeration mode and in a low air volume state, the controller determines the maximum operation frequency of the compressor according to the current indoor environment temperature and indoor environment humidity, so that the frequency of the compressor is limited, namely, even if the compressor operates at the maximum operation frequency, the generation of condensed water can be avoided, and the comfort of a user can be ensured. It can be understood that, avoiding the generation of the condensed water and ensuring the comfort of the user at the same time means to find a balance between the two, so as not to leave the comfort of the user to avoid the generation of the condensed water and ensure the comfort of the user to cause the generation of the condensed water.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an air conditioning system according to the present invention;
fig. 2 is a flowchart illustrating a frequency control method of an air conditioner compressor according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a frequency control method of an air conditioner compressor, which is applied to an air conditioning system to prevent condensation at an air outlet of an air conditioner and ensure the comfort of a user.
The air conditioning system can be of various types, and can comprise an on-hook machine, a cabinet machine, a ceiling machine, a window machine, a mobile air conditioner and an embedded air conditioner according to the installation mode; according to the working principle, the device can comprise a frequency converter and a fixed frequency converter; the use environment may include a household air conditioner and a commercial air conditioner. The following air conditioning system will describe an air conditioner by taking an outdoor unit and an indoor unit which are separately provided as an example.
As shown in fig. 1, the air conditioning system may include an indoor unit 110, an outdoor unit 120, and a refrigerant circulation circuit formed by the indoor unit 110 and the outdoor unit 120. The indoor unit 110 may include an indoor heat exchanger 111 and an indoor fan 112; the outdoor unit 120 may include a compressor 121, an outdoor heat exchanger 122, an outdoor fan 123, a four-way valve 124, and the like. The refrigerant pipes of the indoor unit 110 and the outdoor unit 120 are further provided with a throttle valve 130. An air outlet of the compressor 121 is connected to a first interface of the four-way valve 124, a second interface of the four-way valve 124 is connected to one end of the outdoor heat exchanger 122, the other end of the outdoor heat exchanger 122 is connected to one end of the indoor heat exchanger 111 through the throttle valve 130, and the other end of the indoor heat exchanger 111 is connected to a return air inlet of the compressor 121.
When the air conditioning system operates in a refrigeration mode, the compressor 121 compresses a refrigerant, then discharges a high-pressure steam refrigerant, and flows through the outdoor heat exchanger, and meanwhile outdoor air sucked by an outdoor fan flows through the outdoor heat exchanger to exchange heat for the high-pressure steam refrigerant in the outdoor heat exchanger, so that the high-pressure steam refrigerant is condensed into high-pressure liquid; the high-pressure liquid enters the indoor heat exchanger through the throttle valve and is evaporated at a corresponding low pressure to absorb ambient heat, and meanwhile, the indoor fan continuously sucks air into the indoor heat exchanger for heat exchange and sends the air which is cooled after heat exchange into the room. Therefore, the indoor air continuously and circularly flows to achieve the purpose of reducing the indoor temperature. It is to be understood that when the air conditioning system is operating in the cooling mode, the outdoor heat exchanger may also be referred to as a condenser and the indoor heat exchanger may also be referred to as an evaporator. The refrigerant circulation loop when the air conditioning system operates in the heating mode is just opposite to the refrigerant circulation loop when the air conditioning system operates in the cooling mode, and the outdoor heat exchanger can be called an evaporator, and the indoor heat exchanger can be called a condenser.
When the air conditioning system sends air into the room through the air outlet of the indoor unit 110, since hot air flows around the air outlet, condensed water is easily generated due to the intersection of cold and hot air, which is inconvenient for users to use. Moreover, when the air conditioning system operates in the cooling mode, after the temperature has dropped, the user often wants to reduce the wind speed or reduce the wind output or change the wind direction of the wind outlet by shielding the wind deflector. Even, the air outlet can be shielded by the air diffuser plate, so that the air passes through the small holes arranged on the air diffuser plate, the air output of the air outlet can be greatly reduced, and the user can hardly feel the air, which is called as a no-wind mode. The no-wind-sense mode is that the air conditioner controls the air outlet direction of the air outlet to change under the cooling running state, so that the indoor wind speed is reduced. The indoor wind speed is measured at a position 3m away from the horizontal distance of the air conditioner. Under the no wind sense mode, through the sheltering from to the air outlet for the wind speed of air outlet reduces, and then makes indoor wind speed reduce. Preferably, the indoor wind speed can be lower than 0.3m/s through shielding the air outlet, namely a comfortable state is achieved. Because under the no wind mode, air outlet department is sheltered from, consequently, shelters from the department and produces the comdenstion water more easily.
Therefore, the air conditioning system further includes: a temperature sensor 140, a humidity sensor 150, and a controller 160; the temperature sensor 140 is configured to obtain an indoor ambient temperature of the air conditioner when the air conditioner is in a low air volume state; the humidity sensor 150 is used for acquiring the indoor environment humidity of the air conditioner; the controller 160 is configured to control a maximum operating frequency of the air conditioner compressor to be a frequency value corresponding to the indoor ambient temperature and the indoor ambient humidity according to the indoor ambient temperature and the indoor ambient humidity when the air conditioner system operates in the cooling mode and the air conditioner is in the low air volume state.
Specifically, the temperature sensor 140 is installed at an air return opening of the indoor unit, and is used for detecting the indoor ambient temperature. Of course, the temperature sensor 140 may be installed at other locations in the room, such as in a remote control or other device. The humidity sensor 150 may also be installed at an air return opening of the indoor unit, and is used to detect the humidity of the indoor environment. Of course, the humidity sensor 150 may be installed in other locations in the room, such as in a remote control or other device. The controller 160 may be a control device provided independently, or may be a functional module provided in a control device of an air conditioning system. The controller 160 receives the ambient temperature detected by the temperature sensor 140 and the ambient humidity detected by the humidity sensor 150, and generates a corresponding control command according to the received ambient temperature and ambient temperature, so as to control the maximum operating frequency of the air conditioner compressor to be a frequency value corresponding to the indoor ambient temperature and the indoor ambient humidity. The frequency values corresponding to the indoor ambient temperature and the indoor ambient humidity may be obtained by looking up a table according to a preset mapping relationship, or may be obtained by calculation according to a preset calculation formula.
In the embodiment of the present invention, when the air conditioner is operated in the cooling mode and in the low air volume state, the controller 160 determines the maximum operating frequency of the compressor according to the current indoor environment temperature and indoor environment humidity, so as to limit the frequency of the compressor, that is, even if the compressor is operated at the maximum operating frequency, the compressor can avoid the generation of condensed water and ensure the comfort of the user. It can be understood that, avoiding the generation of the condensed water and ensuring the comfort of the user at the same time means to find a balance between the two, so as not to leave the comfort of the user to avoid the generation of the condensed water and ensure the comfort of the user to cause the generation of the condensed water.
It is understood that the triggering conditions of the controller 160 in performing the compressor frequency control are: whether the air conditioning system is in a low air volume state or not.
In an embodiment, the controller 160 is specifically configured to: acquiring the rotating speed of the indoor fan; and when the rotating speed of the indoor fan of the air conditioner is lower than a preset wind speed threshold value, judging that the air conditioner is in a low wind volume state. Specifically, a set air speed threshold lowfanpredicted is set in the air conditioner, and when the rotating speed of an indoor fan of the air conditioner is lower than the set threshold lowfanpredicted, the air conditioning system is determined to be in a low air volume state. The value range of the set threshold Lowfansped is 600-.
In another embodiment, the controller 160 is further specifically configured to: and judging whether the air conditioning system enters a no-wind-sense mode, and if the air conditioning system enters the no-wind-sense mode, judging that the air conditioning system is in a low-wind-volume state. It should be noted that the non-wind-sensing mode is merely a description term in the present embodiment, and modes of equivalent action and control principle, even if other terms are used, fall within the scope of the present invention.
Further, the humidity sensor 150 is a relative humidity sensor for detecting the indoor relative humidity of the air conditioner.
In an embodiment, the controller 160 is specifically configured to:
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to a preset mapping relation between the compressor frequency and the indoor environment temperature and the indoor environment humidity.
In the embodiment of the invention, a group of indoor environment temperatures are preset, including a plurality of indoor environment temperatures, such as 23 ℃, 24 ℃, 25 ℃, … 28 ℃ and the like; a set of indoor ambient humidities is preset, including a plurality of indoor ambient humidities, e.g., 40%, 50%. 80%, etc. And controlling the air conditioner to operate, setting the target temperature as the indoor environment temperature, and setting the target humidity as the indoor environment humidity. In the operation process of the air conditioner, the frequency of the compressor of the air conditioner is adjusted to test the maximum operation frequency of the compressor, wherein the maximum operation frequency of the compressor can ensure the comfort of users and avoid the generation of condensed water. After a large number of test processes, the mapping relation between the compressor frequency and the indoor environment temperature and the indoor environment humidity can be obtained according to the test data.
Based on the obtained mapping relationship between the compressor frequency and the indoor ambient temperature and humidity, the controller 160 obtains the compressor frequency value corresponding to the indoor ambient temperature and humidity according to the detected indoor ambient temperature and humidity, and controls the maximum operating frequency of the compressor to be the obtained frequency value.
Since the mapping relationship between the compressor frequency and the indoor ambient temperature and humidity is pre-stored in the air conditioner, the controller 160 can obtain the maximum operating frequency of the compressor by looking up the table when performing the frequency control of the compressor, and the operation is simple and quick.
Further, the mapping relationship between the preset compressor frequency and the indoor ambient temperature and the indoor humidity is a corresponding relationship among the compressor frequency, the preset indoor temperature interval and the preset indoor humidity interval. That is, an indoor temperature zone is set in advance, and for example, a temperature zone 1 is 25 ℃ or less, a temperature zone 2 is (24 ℃, 29 ℃), and a temperature zone 3 is 29 ℃ or more. The indoor humidity interval is preset, for example, the humidity interval 1 is (0, 50% ], the humidity interval 2 is (50, 65% ], and the humidity interval 3 is (65, 100% ]. referring to the above test, after a large number of test procedures, the mapping relationship between the compressor frequency and the indoor ambient temperature and the indoor ambient humidity can be obtained from the test data, as shown in the following table 1:
it should be noted that the division of the temperature interval and the humidity interval in the above table is only an example, and does not limit the present invention. In other embodiments, a plurality of temperature intervals and humidity intervals may be defined, and the values of the temperature intervals and the humidity intervals may be divided in various ways.
Based on the mapping relationship, the controller 160 is specifically configured to: obtaining an indoor temperature interval where the indoor environment temperature is located according to the indoor environment temperature; obtaining an indoor humidity interval where the indoor environment humidity is located according to the indoor environment humidity; and obtaining frequency values corresponding to the indoor temperature interval and the indoor humidity interval, and controlling the maximum operation frequency of the air conditioner compressor to be the frequency value.
Because the maximum operation frequency value is in a mapping relation with the preset temperature interval and the preset humidity interval, when the temperature interval of the detected indoor environment temperature and the humidity interval of the detected indoor environment humidity are determined, the corresponding compressor frequency value can be obtained by looking up the table. Therefore, the embodiment is simple and quick to operate; in addition, the embodiment also defines the interval for the temperature and the humidity, thereby saving the storage space of the mapping relation, avoiding frequent adjustment of the frequency of the compressor, and further reducing the operation burden of the controller 160.
It is understood that the humidity in the above mapping relationship may be relative humidity or absolute humidity, and only the absolute humidity is compared with the relative humidity, so that a more accurate compressor frequency can be obtained.
In another embodiment, the controller 160 is specifically configured to: calculating to obtain indoor absolute humidity according to the indoor environment temperature and the indoor relative humidity; and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor absolute humidity according to the mapping relation between the preset indoor absolute humidity and the compressor frequency.
Specifically, the indoor dry bulb temperature T1 is first detected by the temperature sensor 140, the indoor relative humidity RH is detected by the relative humidity sensor 150, and the controller 160 calculates the indoor absolute humidity AH using a formula based on the temperature and the relative humidity RH. The calculation formula of the absolute humidity is specifically as follows:
AH＝a*T1+b*RH+c；
the calculation formula of the absolute humidity AH is obtained by fitting according to a humid air enthalpy-humidity diagram, wherein the value range of a is 0.2-2, and preferably 0.5-1.5; the value range of b is 0-2, preferably 0.2-0.5; c ranges from (-40) to 10, preferably (-30) to (-20).
The controller 160 then calculates the maximum compressor limit operable frequency value FR based on the absolute humidity AH, wherein FR is calculated as follows:
FR＝d*AH+f；
wherein d ranges from (-5) to (-1), preferably from (-3) to (-2); the value range of f is 20-70, preferably 30-50.
In this embodiment, through a preset calculation formula, when the indoor temperature and the indoor relative humidity are obtained, the maximum operating frequency of the air conditioner compressor is calculated according to the preset calculation formula. Due to the adoption of the formula, compared with a table look-up table, the calculated maximum operating frequency is more accurate, the method is not limited to the setting of a mapping relation, and the maximum operating frequency corresponding to any indoor temperature and indoor relative humidity can be obtained. It is understood that, in the above preset calculation formula, the absolute humidity may not be calculated, but may be calculated directly according to the indoor temperature and the indoor relative humidity, and although the calculation accuracy is not as high as that of the absolute humidity, the calculation process is reduced. Those skilled in the art can select the corresponding frequency calculation mode according to the specific use case.
Correspondingly, the invention provides a frequency control method of the air conditioner compressor. As shown in fig. 2, the frequency control method of the air conditioner compressor includes the following steps;
step S110, judging whether the air conditioner is in a low air volume state;
in an embodiment, the controller 160 is specifically configured to: acquiring the rotating speed of the indoor fan; and when the rotating speed of the indoor fan of the air conditioner is lower than a preset wind speed threshold value, judging that the air conditioner is in a low wind volume state. Specifically, a set air speed threshold lowfanpredicted is set in the air conditioner, and when the rotating speed of an indoor fan of the air conditioner is lower than the set threshold lowfanpredicted, the air conditioning system is determined to be in a low air volume state. The value range of the set threshold Lowfansped is 600-.
In another embodiment, the controller 160 is further specifically configured to: and judging whether the air conditioning system enters a no-wind-sense mode, and if the air conditioning system enters the no-wind-sense mode, judging that the air conditioning system is in a low-wind-volume state. It should be noted that the non-wind-sensing mode is merely a description term in the present embodiment, and modes of equivalent action and control principle, even if other terms are used, fall within the scope of the present invention.
Step S120, when the air conditioner is in a low air volume state, acquiring the indoor environment temperature of the air conditioner;
step S130, acquiring the indoor environment humidity of the air conditioner;
when the air conditioner is in a low air volume state, the indoor ambient temperature of the air conditioner is acquired through the temperature sensor 140, and the indoor ambient humidity of the air conditioner is acquired through the humidity sensor 150. Specifically, the temperature sensor 140 is installed at an air return opening of the indoor unit, and is used for detecting the indoor ambient temperature. Of course, the temperature sensor 140 may be installed at other locations in the room, such as in a remote control or other device. The humidity sensor 150 may also be installed at an air return opening of the indoor unit, and is used to detect the humidity of the indoor environment. Of course, the humidity sensor 150 may be installed in other locations in the room, such as in a remote control or other device.
And step S140, controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to the indoor environment temperature and the indoor environment humidity.
When the air conditioning system operates in a refrigeration mode and the air conditioner is in a low air volume state, the controller 160 generates a corresponding control instruction according to the indoor environment temperature and the indoor environment humidity, and controls the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity. The frequency values corresponding to the indoor ambient temperature and the indoor ambient humidity may be obtained by looking up a table according to a preset mapping relationship, or may be obtained by calculation according to a preset calculation formula.
In the embodiment of the present invention, when the air conditioner is operated in the cooling mode and in the low air volume state, the controller 160 determines the maximum operating frequency of the compressor according to the current indoor environment temperature and indoor environment humidity, so as to limit the frequency of the compressor, that is, even if the compressor is operated at the maximum operating frequency, the compressor can avoid the generation of condensed water and ensure the comfort of the user. It can be understood that, avoiding the generation of the condensed water and ensuring the comfort of the user at the same time means to find a balance between the two, so as not to leave the comfort of the user to avoid the generation of the condensed water and ensure the comfort of the user to cause the generation of the condensed water.
Further, the humidity sensor 150 is a relative humidity sensor for detecting the indoor relative humidity of the air conditioner.
In an embodiment, the step S140 specifically includes:
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to a preset mapping relation between the compressor frequency and the indoor environment temperature and the indoor environment humidity.
In the embodiment of the invention, a group of indoor environment temperatures are preset, including a plurality of indoor environment temperatures, such as 23 ℃, 24 ℃, 25 ℃, … 28 ℃ and the like; a set of indoor ambient humidities is preset, including a plurality of indoor ambient humidities, e.g., 40%, 50%. 80%, etc. And controlling the air conditioner to operate, setting the target temperature as the indoor environment temperature, and setting the target humidity as the indoor environment humidity. In the operation process of the air conditioner, the frequency of the compressor of the air conditioner is adjusted to test the maximum operation frequency of the compressor, wherein the maximum operation frequency of the compressor can ensure the comfort of users and avoid the generation of condensed water. After a large number of test processes, the mapping relation between the compressor frequency and the indoor environment temperature and the indoor environment humidity can be obtained according to the test data.
Based on the obtained mapping relationship between the compressor frequency and the indoor ambient temperature and humidity, the controller 160 obtains the compressor frequency value corresponding to the indoor ambient temperature and humidity according to the detected indoor ambient temperature and humidity, and controls the maximum operating frequency of the compressor to be the obtained frequency value.
Since the mapping relationship between the compressor frequency and the indoor ambient temperature and humidity is pre-stored in the air conditioner, the controller 160 can obtain the maximum operating frequency of the compressor by looking up the table when performing the frequency control of the compressor, and the operation is simple and quick.
Further, the mapping relationship between the preset compressor frequency and the indoor ambient temperature and the indoor humidity is a corresponding relationship among the compressor frequency, the preset indoor temperature interval and the preset indoor humidity interval. That is, an indoor temperature zone is set in advance, and for example, a temperature zone 1 is 25 ℃ or less, a temperature zone 2 is (24 ℃, 29 ℃), and a temperature zone 3 is 29 ℃ or more. The indoor humidity interval is preset, for example, the humidity interval 1 is (0, 50% ], the humidity interval 2 is (50, 65% ], and the humidity interval 3 is (65, 100% ]. referring to the above test, after a large number of test procedures, the mapping relationship between the compressor frequency and the indoor ambient temperature and the indoor ambient humidity can be obtained from the test data, as shown in the following table 1:
it should be noted that the division of the temperature interval and the humidity interval in the above table is only an example, and does not limit the present invention. In other embodiments, a plurality of temperature intervals and humidity intervals may be defined, and the values of the temperature intervals and the humidity intervals may be divided in various ways.
Based on the mapping relationship, the step S140 further specifically includes:
obtaining an indoor temperature interval where the indoor environment temperature is located according to the indoor environment temperature;
obtaining an indoor humidity interval where the indoor environment humidity is located according to the indoor environment humidity;
and obtaining frequency values corresponding to the indoor temperature interval and the indoor humidity interval, and controlling the maximum operation frequency of the air conditioner compressor to be the frequency value.
Because the maximum operation frequency value is in a mapping relation with the preset temperature interval and the preset humidity interval, when the temperature interval of the detected indoor environment temperature and the humidity interval of the detected indoor environment humidity are determined, the corresponding compressor frequency value can be obtained by looking up the table. Therefore, the embodiment is simple and quick to operate; in addition, the embodiment also defines the interval for the temperature and the humidity, thereby saving the storage space of the mapping relation, avoiding frequent adjustment of the frequency of the compressor, and further reducing the operation burden of the controller 160.
It is understood that the humidity in the above mapping relationship may be relative humidity or absolute humidity, and only the absolute humidity is compared with the relative humidity, so that a more accurate compressor frequency can be obtained.
In another embodiment, the step S140 further specifically includes:
calculating to obtain indoor absolute humidity according to the indoor environment temperature and the indoor relative humidity;
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor absolute humidity according to the mapping relation between the preset indoor absolute humidity and the compressor frequency.
Specifically, the indoor dry bulb temperature T1 is first detected by the temperature sensor 140, the indoor relative humidity RH is detected by the relative humidity sensor 150, and the controller 160 calculates the indoor absolute humidity AH using a formula based on the temperature and the relative humidity RH. The calculation formula of the absolute humidity is specifically as follows:
AH＝a*T1+b*RH+c；
the calculation formula of the absolute humidity AH is obtained by fitting according to a humid air enthalpy-humidity diagram, wherein the value range of a is 0.2-2, and preferably 0.5-1.5; the value range of b is 0-2, preferably 0.2-0.5; c ranges from (-40) to 10, preferably (-30) to (-20).
The controller 160 then calculates the maximum compressor limit operable frequency value FR based on the absolute humidity AH, wherein FR is calculated as follows:
FR＝d*AH+f；
wherein d ranges from (-5) to (-1), preferably from (-3) to (-2); the value range of f is 20-70, preferably 30-50.
In this embodiment, through a preset calculation formula, when the indoor temperature and the indoor relative humidity are obtained, the maximum operating frequency of the air conditioner compressor is calculated according to the preset calculation formula. Due to the adoption of the formula, compared with a table look-up table, the calculated maximum operating frequency is more accurate, the method is not limited to the setting of a mapping relation, and the maximum operating frequency corresponding to any indoor temperature and indoor relative humidity can be obtained. It is understood that, in the above preset calculation formula, the absolute humidity may not be calculated, but may be calculated directly according to the indoor temperature and the indoor relative humidity, and although the calculation accuracy is not as high as that of the absolute humidity, the calculation process is reduced. Those skilled in the art can select the corresponding frequency calculation mode according to the specific use case.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The frequency control method of the air conditioner compressor is characterized in that the air conditioner runs in a refrigeration mode, and the frequency control method of the air conditioner compressor comprises the following steps;
judging whether the air conditioner is in a low air volume state or not;
when the air conditioner is in a low air volume state, acquiring the indoor environment temperature of the air conditioner;
acquiring the indoor environment humidity of the air conditioner;
and controlling the maximum operating frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to the indoor environment temperature and the indoor environment humidity.
2. The method for controlling the frequency of an air conditioner compressor according to claim 1, wherein the indoor ambient humidity is an indoor relative humidity;
the step of controlling the frequency of the air conditioner compressor to operate at a frequency value corresponding to the indoor environment and the indoor environment humidity according to the indoor environment temperature and the indoor environment humidity comprises the following steps:
calculating to obtain indoor absolute humidity according to the indoor environment temperature and the indoor relative humidity;
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor absolute humidity according to the mapping relation between the preset indoor absolute humidity and the compressor frequency.
3. The method for controlling the frequency of an air conditioner compressor according to claim 1, wherein the step of controlling the maximum operation frequency of the air conditioner compressor to a frequency value corresponding to the indoor ambient temperature and the indoor ambient humidity according to the indoor ambient temperature and the indoor ambient humidity comprises:
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to a preset mapping relation between the compressor frequency and the indoor environment temperature and the indoor environment humidity.
4. The method as claimed in claim 3, wherein the mapping relationship between the preset compressor frequency and the indoor ambient temperature and humidity is the corresponding relationship between the compressor frequency, the preset indoor temperature interval and the preset indoor humidity interval;
the step of controlling the maximum operating frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to the preset mapping relationship between the compressor frequency and the indoor environment temperature and the indoor environment humidity comprises the following steps:
obtaining an indoor temperature interval where the indoor environment temperature is located according to the indoor environment temperature;
obtaining an indoor humidity interval where the indoor environment humidity is located according to the indoor environment humidity;
and obtaining frequency values corresponding to the indoor temperature interval and the indoor humidity interval, and controlling the maximum operation frequency of the air conditioner compressor to be the frequency value.
5. The method for controlling the frequency of an air conditioner compressor according to any one of claims 1 to 4, wherein the judging whether the air conditioner is in a low air volume state comprises:
judging whether the rotating speed of the indoor fan of the air conditioner is lower than a preset wind speed threshold value or not;
and when the rotating speed of the indoor fan of the air conditioner is lower than a preset wind speed threshold value, judging that the air conditioner is in a low wind volume state.
6. An air conditioning system comprises a compressor, an evaporator, a condenser, an indoor fan and a refrigerant loop formed by connecting the compressor, the evaporator and the condenser in series, and is characterized by also comprising a temperature sensor, a humidity sensor and a controller; wherein,
the temperature sensor is used for acquiring the indoor environment temperature of the air conditioner when the air conditioner is in a low air volume state;
the humidity sensor is used for acquiring the indoor environment humidity of the air conditioner;
the controller is used for controlling the maximum operation frequency of the air conditioner compressor to be frequency values corresponding to the indoor environment temperature and the indoor environment humidity according to the indoor environment temperature and the indoor environment humidity when the air conditioner system operates in a refrigeration mode and the air conditioner is in a low air volume state.
7. The air conditioning system as claimed in claim 6, wherein the humidity sensor is used to acquire indoor relative humidity of the air conditioner;
the controller is configured to:
calculating to obtain indoor absolute humidity according to the indoor environment temperature and the indoor relative humidity;
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor absolute humidity according to the mapping relation between the preset indoor absolute humidity and the compressor frequency.
8. The air conditioning system as set forth in claim 6, wherein said controller is configured to:
and controlling the maximum operation frequency of the air conditioner compressor to be a frequency value corresponding to the indoor environment temperature and the indoor environment humidity according to a preset mapping relation between the compressor frequency and the indoor environment temperature and the indoor environment humidity.
9. The air conditioning system as claimed in claim 8, wherein the mapping relationship between the preset compressor frequency and the indoor ambient temperature and the indoor humidity is a corresponding relationship between the compressor frequency, a preset indoor temperature range and a preset indoor humidity range; the controller is configured to:
obtaining an indoor temperature interval where the indoor environment temperature is located according to the indoor environment temperature;
obtaining an indoor humidity interval where the indoor environment humidity is located according to the indoor environment humidity;
and obtaining frequency values corresponding to the indoor temperature interval and the indoor humidity interval, and controlling the maximum operation frequency of the air conditioner compressor to be the frequency value.
10. The air conditioning system as claimed in any one of claims 6 to 9, wherein the controller is configured to:
acquiring the rotating speed of the indoor fan;
and when the rotating speed of the indoor fan of the air conditioner is lower than a preset wind speed threshold value, judging that the air conditioner is in a low wind volume state.
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