CN113091215A - Heating control method of air conditioner - Google Patents
Heating control method of air conditioner Download PDFInfo
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- CN113091215A CN113091215A CN202110379578.2A CN202110379578A CN113091215A CN 113091215 A CN113091215 A CN 113091215A CN 202110379578 A CN202110379578 A CN 202110379578A CN 113091215 A CN113091215 A CN 113091215A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioning, in particular to a heating control method of an air conditioner. The air conditioner aims at solving the problems that the frosting speed is high and the user experience is influenced when the air conditioner is used for heating in a low-temperature and high-humidity environment. To this end, the heating control method of the present application includes: determining a condensation temperature of an outdoor environment; acquiring the temperature of an outer coil of an outdoor heat exchanger; comparing the temperature of the outer coil with a first temperature threshold and the condensation temperature; and when the temperature of the outer coil is smaller than the first temperature threshold and is larger than or equal to the condensation temperature, adjusting the opening of the throttle valve according to the temperature interval of the temperature of the outer coil. The control method can delay the frosting speed of the outdoor heat exchanger, avoids the situation that the throttle valve is smaller and smaller when the throttle valve is closed because the opening of the throttle valve is controlled only according to the target exhaust temperature under the special outdoor environment condition, ensures that the heating capacity curve is stable and the attenuation is slow, and improves the user experience.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a heating control method of an air conditioner.
Background
For an air conditioner equipped with an electronic expansion valve, in order to achieve a better cooling/heating effect, the opening degree of the electronic expansion valve is generally controlled based on a target exhaust temperature of a compressor, and when the actual exhaust temperature of the compressor is lower than the target exhaust temperature, the actual exhaust temperature is increased by controlling the electronic expansion valve to reduce the opening degree; and conversely, when the actual exhaust temperature of the compressor is greater than the target exhaust temperature, the actual exhaust temperature is reduced by controlling the electronic expansion valve to increase the opening degree.
However, when the air conditioner is operated in a low-temperature and high-humidity environment, the above control method has the following problems: when the air conditioner operates in a heating mode in a low-temperature high-humidity environment, the evaporation temperature of the outdoor heat exchanger is low, the surface of the outdoor heat exchanger frosts when the temperature is lower than the dew point temperature of air, and along with the thickening of a frost layer, the heat exchange quantity between the outdoor heat exchanger and the air is lower and lower, so that the suction temperature and the exhaust temperature of the compressor are reduced, and the indoor air outlet temperature is also reduced. On the other hand, when the outdoor environment does not change significantly, the target exhaust temperature is kept unchanged basically, so in order to reach the target exhaust temperature as soon as possible, the opening degree of the electronic expansion valve is gradually reduced, which leads to the frosting speed of the outdoor heat exchanger being increased, and in such a vicious circle, the electronic expansion valve is smaller and smaller, and finally, when the frosting reaches a certain degree, the air conditioner starts to defrost, which leads to large fluctuation of the indoor temperature, and influences the user experience.
Accordingly, there is a need in the art for a new heating control method of an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve at least one of the above problems in the prior art, namely, to solve the problems that the frosting speed is high and the user experience is affected when the air conditioner is operated in a low-temperature and high-humidity environment for heating, the application provides a heating control method of the air conditioner, wherein the air conditioner comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a throttle valve with controllable opening degree,
the heating control method comprises the following steps:
determining a condensation temperature of an outdoor environment;
acquiring the temperature of an outer coil of the outdoor heat exchanger;
comparing the temperature of the outer coil with a first temperature threshold and the magnitude of the condensation temperature;
and when the temperature of the outer coil is smaller than the first temperature threshold and is larger than or equal to the condensation temperature, adjusting the opening of the throttle valve according to the temperature interval of the temperature of the outer coil.
In a preferable embodiment of the heating control method of the air conditioner, the step of "adjusting the opening of the throttle valve according to a temperature interval in which the temperature of the external coil is located" further includes:
comparing the temperature of the outer coil to a second temperature threshold and a third temperature threshold;
adjusting the opening of the throttle valve according to the comparison result;
wherein the first temperature threshold, the second temperature threshold, the third temperature threshold, and the dew temperature decrease sequentially.
In a preferable embodiment of the heating control method of an air conditioner, the step of "adjusting the opening degree of the throttle valve based on the comparison result" further includes:
when the temperature of the outer coil is smaller than the first temperature threshold and larger than or equal to the second temperature threshold, controlling the throttle valve to adjust to a fixed opening degree;
when the temperature of the external coil is smaller than the second temperature threshold and is larger than or equal to the third temperature threshold, controlling the throttle valve to be continuously opened at a first opening speed;
when the temperature of the external coil pipe is smaller than a third temperature threshold value and is larger than or equal to the condensation temperature, controlling the throttle valve to be continuously opened at a second opening speed;
wherein the first valve opening speed is less than the second valve opening speed.
In a preferable embodiment of the heating control method of the air conditioner, the fixed opening degree is determined based on an outdoor ambient temperature and an operating frequency of the compressor; or
The fixed opening is determined by:
when the temperature of the outer coil pipe is smaller than the first temperature threshold value and larger than or equal to the second temperature threshold value, the opening degree of the throttle valve is controlled according to the target exhaust temperature of the compressor, and the fixed opening degree is the opening degree of the outer coil pipe after the temperature of the outer coil pipe is in the current temperature interval and lasts for a first preset time.
In a preferable embodiment of the heating control method of the air conditioner, the heating control method further includes, while the throttle valve is continuously opened:
acquiring the actual exhaust temperature of the compressor and the temperature of an inner coil of the indoor heat exchanger;
calculating a difference between the actual exhaust temperature and the inner coil temperature;
judging whether the difference value is smaller than a preset temperature difference threshold value or not;
and when the difference value is smaller than the temperature difference threshold value, controlling the throttle valve to stop opening.
In a preferable embodiment of the heating control method of the air conditioner, the second temperature threshold and the third temperature threshold are determined based on the dew condensation temperature.
In a preferable embodiment of the heating control method of the air conditioner, the heating control method further includes:
and when the temperature of the external coil is greater than or equal to the first temperature threshold value, controlling the opening of the throttle valve according to the target exhaust temperature of the compressor.
In a preferable embodiment of the heating control method of the air conditioner, the target discharge temperature is determined based on an outdoor ambient temperature and an operating frequency of the compressor.
In a preferable embodiment of the heating control method of the air conditioner, the heating control method further includes:
and when the temperature of the outer coil pipe is less than the condensation temperature and lasts for a second preset time length, controlling the air conditioner to operate in a defrosting mode.
In a preferable embodiment of the heating control method of an air conditioner, the step of "determining the condensation temperature of the outdoor environment" further includes:
acquiring the outdoor environment temperature;
and determining the condensation temperature according to the outdoor environment temperature.
It should be noted that, in a preferred embodiment of the present application, the air conditioner includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a throttle valve with a controllable opening degree, and the heating control method includes: determining a condensation temperature of an outdoor environment; acquiring the temperature of an outer coil of an outdoor heat exchanger; comparing the temperature of the outer coil with a first temperature threshold and the condensation temperature; and when the temperature of the outer coil is smaller than the first temperature threshold and is larger than or equal to the condensation temperature, adjusting the opening of the throttle valve according to the temperature interval of the temperature of the outer coil.
When the temperature of the outer coil pipe is between the first temperature threshold value and the condensation temperature, the opening of the throttle valve is adjusted according to the temperature interval where the temperature of the outer coil pipe is located, the frosting speed of the outdoor heat exchanger can be delayed, the situation that the throttle valve is smaller and smaller when the throttle valve is closed due to the fact that the opening of the throttle valve is controlled only according to the target exhaust temperature under the special outdoor environment condition is avoided, the heating capacity curve of the air conditioner is stable, attenuation is slow, and user experience is improved.
Furthermore, when the temperature of the external coil pipe is smaller than the first temperature threshold and larger than or equal to the second temperature threshold, the throttle valve is controlled to be adjusted to a fixed opening, so that the excessive throttling of the refrigerant caused by the further closing of the throttle valve can be avoided, and the frosting speed is delayed; when the temperature of the external coil pipe is smaller than the second temperature threshold value and is larger than or equal to the third temperature threshold value, the throttle valve is controlled to be continuously opened at the first opening speed, so that the opening degree of the throttle valve can be continuously increased, the refrigerant circulation quantity and the temperature in the outdoor heat exchanger can be increased at a higher speed, and the frosting is delayed; when the temperature of the outer coil pipe is smaller than the third temperature threshold value and is larger than or equal to the condensation temperature, the throttle valve is controlled to be continuously opened at the second opening speed, the opening degree of the throttle valve can be rapidly increased, the refrigerant circulation quantity and the temperature in the outdoor heat exchanger are rapidly increased, and frosting is delayed.
Further, through the in-process that the choke valve lasts the valve of opening, judge the difference and the size of presetting the difference threshold value of the actual exhaust temperature of compressor and interior coil pipe temperature to control the choke valve to stop opening the valve when the difference is less than presetting the difference threshold value, the control method of this application can also follow user experience's aspect on the basis of delaying the speed of frosting, stops opening the valve when the difference is less than presetting the difference threshold value, reduces the fluctuation of indoor air-out temperature, guarantees user experience.
Drawings
A heating control method of an air conditioner of the present application is described below with reference to the accompanying drawings. In the drawings:
fig. 1 is a flowchart of a heating control method of an air conditioner according to the present invention;
fig. 2 is a logic diagram of a possible embodiment of a heating control method of an air conditioner according to the present invention.
Detailed Description
Preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principles of the present application, and are not intended to limit the scope of protection of the present application. Although the following embodiments describe each step in a sequential manner, those skilled in the art can understand that, in order to achieve the effect of the present embodiments, different steps need not be executed in such an order, and they may be executed simultaneously (in parallel) or executed in an inverted order, and these simple changes are all within the protection scope of the present application.
It should be noted that the terms "first," "second," and "third" in the description of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present application, unless otherwise explicitly specified or limited, the term "connected" is to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.
The air conditioner of the present application will be briefly described first. The air conditioner comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a throttle valve with controllable opening, wherein the compressor, the outdoor heat exchanger, the throttle valve and the indoor heat exchanger are sequentially connected through pipelines to form a complete refrigerant circulation loop. The throttle valve is preferably an electronic expansion valve, and of course, those skilled in the art may select other valve bodies with throttle function and controllable opening degree, such as an electromagnetic valve. In addition, in some possible embodiments, the air conditioner may further include a four-way valve, and four interfaces of the four-way valve are respectively connected to the air inlet, the air outlet, the indoor heat exchanger and the outdoor heat exchanger of the compressor through pipelines to realize switching between cooling and heating.
In order to realize the following heating control method, the air conditioner of the present application further includes the following components:
the outdoor temperature sensor is disposed in the outdoor unit, for example, on a casing of the outdoor unit, or fixed at an air inlet of the outdoor unit, and is used for collecting an outdoor environment temperature.
The outer coil temperature sensor is arranged on the coil of the outdoor heat exchanger and used for collecting the temperature of the outer coil of the outdoor heat exchanger, and the specific arrangement position of the outer coil temperature sensor is not limited in the embodiment as long as the position of the temperature of the outer coil of the outdoor heat exchanger can be obtained.
The inner coil temperature sensor is arranged on a coil of the indoor heat exchanger and used for collecting the temperature of the inner coil of the indoor heat exchanger, and the specific setting position of the inner coil temperature sensor is not limited in the embodiment as long as the position of the temperature of the inner coil of the indoor heat exchanger can be obtained.
And the exhaust temperature sensor is arranged at an exhaust port of the compressor, such as an exhaust pipe of the compressor, and is used for acquiring the actual exhaust temperature of the compressor.
Of course, the air conditioner is also provided with a control unit, the control unit is connected with the compressor, the electronic expansion valve, the four-way valve and the sensors, the control unit is configured to be capable of acquiring the operation data of the air conditioner (such as the frequency of the compressor, the opening degree of the electronic expansion valve and the like) and the data collected by the sensors, processing the data based on the data collected by the sensors, and controlling the operation of the air conditioner based on the data processing result, such as controlling the opening degree of the electronic expansion valve, the reversing of the four-way valve, the operation frequency and the start-stop of the compressor and the like.
It should be noted that the control unit may be an original control chip of the air conditioner, may be a controller specially added to the air conditioner for executing the method of the present application, or may be a functional module or a functional unit of a general controller.
Those skilled in the art will appreciate that the control unit of the air conditioner described above further includes some other known structures, such as a processor, a memory, etc., wherein the memory includes, but is not limited to, a random access memory, a flash memory, a read only memory, a programmable read only memory, a volatile memory, a non-volatile memory, a serial memory, a parallel memory or a register, etc., and the processor includes, but is not limited to, a CPLD/FPGA, a DSP, an ARM processor, a MIPS processor, etc. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
The heating control method of the air conditioner of the present application will be described with reference to fig. 1, taking an electronic expansion valve as an example. Fig. 1 is a flowchart illustrating a heating control method of an air conditioner according to the present invention.
As shown in fig. 1, in order to solve the problems of fast frosting speed and influence on user experience when the air conditioner is operated for heating in a low-temperature and high-humidity environment, a heating control method of the air conditioner in the present application includes:
s101, determining the condensation temperature of the outdoor environment; for example, the condensation temperature of the current outdoor environment is determined according to the outdoor environment temperature and/or humidity, and when the temperature of the external coil is less than the condensation temperature, the frosting of the indoor heat exchanger is relatively serious, and a defrosting treatment is required.
S103, acquiring the temperature of an outer coil of the outdoor heat exchanger; for example, the temperature of the outdoor coil of the outdoor heat exchanger collected by the temperature sensor of the outdoor coil is obtained.
S105, comparing the temperature of the outer coil with a first temperature threshold and the condensation temperature; for example, comparing the temperature of the external coil with the first temperature threshold and the condensation temperature through a difference value or a ratio and the like; the first temperature threshold is larger than the condensation temperature, and when the temperature of the outer coil pipe is smaller than the first temperature threshold, the outdoor heat exchanger is easy to frost.
S107, when the temperature of the external coil pipe is smaller than the first temperature threshold value and is larger than or equal to the condensation temperature, adjusting the opening degree of the electronic expansion valve according to the temperature interval of the temperature of the external coil pipe; for example, when the temperature of the external coil is less than the first temperature threshold value and equal to or greater than the condensation temperature, it is proved that the outdoor heat exchanger is easy to frost, but the frost is not yet formed, and at this time, the opening degree of the electronic expansion valve is adjusted according to the temperature section in which the temperature of the external coil is located, for example, the electronic expansion valve is controlled to stop closing the valve or increase the opening degree.
Generally, when the electronic expansion valve is controlled at a target discharge temperature, the suction temperature and the discharge temperature of the compressor are both reduced when the outdoor heat exchanger is frosted, and at this time, the opening degree of the electronic expansion valve needs to be reduced in order to make the actual discharge temperature of the compression molding machine reach the target discharge temperature as soon as possible. After the opening of the electronic expansion valve is reduced, the frosting speed of the outdoor heat exchanger is increased, the speed of the air conditioner entering a defrosting mode is increased, and the indoor air outlet temperature is caused to fluctuate. When the temperature of the outer coil is between the first temperature threshold and the condensation temperature, the opening degree of the electronic expansion valve is adjusted according to the temperature interval where the temperature of the outer coil is, if the valve closing is stopped or the opening degree of the electronic expansion valve is increased, the frosting speed of the outdoor heat exchanger can be delayed, the situation that the throttle valve is closed more and less due to the fact that the opening degree of the throttle valve is controlled only according to the target exhaust temperature under the outdoor environment condition of low temperature and high humidity is avoided, the heating capacity curve of the air conditioner is stable, the attenuation is slow, and the user experience is improved.
The following describes a more preferred embodiment of the present application.
In a more preferred embodiment, step S101 further includes:
acquiring the outdoor environment temperature; and determining the condensation temperature according to the outdoor environment temperature.
For example, the dew temperature is determined by the following equation (1):
Tes＝C×Tao-α (1)
in the formula (1), Tes is condensation temperature; tao is the outdoor ambient temperature; c and alpha are constants. Wherein the constants C and α may be determined based on experimental or empirical values. In one possible embodiment, the applicant determined by way of experiment: and alpha is 6, the value of the constant C is determined based on the outdoor environment temperature Tao, when Tao is less than 0 ℃, C is 0.8, and when Tao is more than or equal to 0 ℃, C is 0.6. When C and alpha determined according to the test are calculated, the condensation degree of the outdoor heat exchanger can be better reflected, and an accurate judgment basis is provided for the operation of the defrosting mode of the air conditioner.
In a preferred embodiment, step S107 further includes:
comparing the temperature of the outer coil to a second temperature threshold and a third temperature threshold; and adjusting the opening degree of the electronic expansion valve according to the comparison result.
Specifically, when the temperature of the external coil pipe is less than a first temperature threshold value and more than or equal to a second temperature threshold value, the electronic expansion valve is controlled to be adjusted to a fixed opening degree; when the temperature of the outer coil pipe is smaller than the second temperature threshold value and larger than or equal to the third temperature threshold value, controlling the electronic expansion valve to continuously open at a first valve opening speed; when the temperature of the outer coil pipe is less than a third temperature threshold value and is greater than or equal to the condensation temperature, controlling the electronic expansion valve to continuously open at a second valve opening speed; wherein the first valve opening speed is smaller than the second valve opening speed, and the first temperature threshold, the second temperature threshold, the third temperature threshold and the condensation temperature are sequentially reduced.
As a preferred embodiment, the first temperature threshold may preferably be 0 ℃, and the second temperature threshold and the third temperature threshold are determined based on the condensation temperature. The specific determination method is as follows:
after calculating the condensation temperature, calculating the difference between the condensation temperature and the first temperature threshold, then making the second temperature threshold equal to one third of the difference, and making the third temperature threshold equal to two times of the second temperature threshold, namely: t1 ═ 0 ℃, T2 ═ Tes-T1)/3, T3 ═ 2 × T2.
For example, if the outdoor ambient temperature is 5 ℃, then Tes ═ 0.6 × 5-6 ═ -3 ℃ can be obtained according to equation (1), where T1 ═ 0 ℃, T2 ═ 3-0)/3 ═ -1 ℃, and T3 ═ 2 × (-1) ═ 2 ℃.
For another example, if the outdoor ambient temperature is-3 ℃, Tes ═ 0.6 × (-5) -6 ═ -9 ℃ can be obtained according to formula (1), where T1 ═ 0 ℃, T2 ═ 9-0)/3 ═ 3 ℃, and T3 ═ 2 × (-3) — -6 ℃.
When T1, T2, T3 and Tes are determined, the obtained outer coil temperature Te is compared with T1, T2, T3 and Tes respectively, and the temperature interval of the outer coil temperature is determined.
i) And when the temperature of the outer coil pipe is smaller than the first temperature threshold value and larger than or equal to the second temperature threshold value, controlling the electronic expansion valve to adjust to a fixed opening. Taking the example that Tes is-3 ℃, T1 is 0 ℃, T2 is-1 ℃ and T3 is-2 ℃, if the temperature of the external coil is-1 or more and Te is less than 0, it is proved that the temperature of the external coil of the outdoor heat exchanger is less than 0 ℃ at the moment, the outdoor heat exchanger starts frosting, and if the opening degree of the electronic expansion valve is still controlled according to the target exhaust temperature, the frosting speed is accelerated. At the moment, the electronic expansion valve is controlled to be adjusted to a fixed opening degree so as to slow down the frosting speed of the outdoor heat exchanger.
As a preferred embodiment, the fixed opening degree is determined based on the following formula (2):
P＝Int(ap×f+bp+cp) (2)
in the formula (2), P is the opening degree of the electronic expansion valve, and Int () is a rounding operation; f is the operating frequency of the compressor; ap and bp are coefficients, and cp is a correction coefficient of the outdoor environment temperature to the opening of the electronic expansion valve. The specific values of ap, bp and cp can be determined experimentally or empirically. When the determination is carried out based on the test, the compressor can be controlled to carry out heating operation at different operating frequencies under different outdoor environment temperatures, the frosting degree of the outdoor heat exchanger is enabled to be minimum by adjusting the opening degree of the electronic expansion valve, so that the corresponding relation among the operating frequency of the compressor, the outdoor environment temperature and the opening degree of the electronic expansion valve is obtained, and then the solution is carried out based on the corresponding relation to obtain the specific numerical values of ap, bp and cp.
ii) when the temperature of the external coil is less than the second temperature threshold value and is greater than or equal to the third temperature threshold value, controlling the electronic expansion valve to be continuously opened at the first opening speed. Still taking the example that Tes is-3 deg.C, T1 is 0 deg.C, T2 is-1 deg.C, T3 is-2 deg.C, if Te is more than-2 and less than-1, it is proved that the temperature of the external coil of the outdoor heat exchanger is less than 0 deg.C and further decreases, the frosting degree of the outdoor heat exchanger increases, and at this time, further measures are needed to suppress the frosting speed of the outdoor heat exchanger. And controlling the electronic expansion valve to continuously open at the first valve opening speed so as to further reduce the frosting speed of the outdoor heat exchanger. For example, the first valve opening speed may be 1B/10s, i.e. an opening of 1B per 10 s.
And iii) when the temperature of the external coil is less than the third temperature threshold value and is greater than or equal to the condensation temperature, controlling the electronic expansion valve to be continuously opened at a second valve opening speed. Still take Tes ═ 3 ℃, T1 ═ 0 ℃, T2 ═ 1 ℃ and T3 ═ 2 ℃ as an example, if the temperature of the external coil is-3 ≤ Te and Te ≤ 2, it is proved that the temperature of the external coil of the outdoor heat exchanger is sharply reduced and the frosting of the outdoor heat exchanger is serious, and measures are further taken to inhibit the frosting speed of the outdoor heat exchanger. And controlling the electronic expansion valve to continuously open at a second valve opening speed so as to quickly reduce the frosting speed of the outdoor heat exchanger. For example, the second valve opening speed may be 1B/5s, i.e. an opening of 1B per 5 s.
Of course, the specific values of the first valve opening speed and the second valve opening speed are not exclusive, and those skilled in the art can adjust the values based on the specific application scenario as long as the second valve opening speed satisfies the condition of being greater than the first development speed.
When the temperature of the outer coil pipe is smaller than the first temperature threshold value and larger than or equal to the second temperature threshold value, the electronic expansion valve is controlled to be adjusted to a fixed opening degree, so that the excessive throttling of a refrigerant caused by the further closing of the electronic expansion valve can be avoided, and the frosting speed is delayed; when the temperature of the external coil pipe is less than the second temperature threshold value and more than or equal to the third temperature threshold value, the electronic expansion valve is controlled to continuously open at the first valve opening speed, so that the opening degree of the electronic expansion valve can be continuously increased, the refrigerant circulation quantity and the temperature in the outdoor heat exchanger can be increased at a higher speed, and the frosting is delayed; when the temperature of the external coil pipe is less than the third temperature threshold value and is more than or equal to the condensation temperature, the electronic expansion valve is controlled to continuously open at the second opening speed, so that the opening degree of the electronic expansion valve can be rapidly increased, the refrigerant circulation quantity and the temperature in the outdoor heat exchanger are rapidly increased, and the frosting is delayed.
In a more preferred embodiment, the heating control method may further include, while the electronic expansion valve is continuously opened at the first valve opening speed or the second valve opening speed:
acquiring the actual exhaust temperature of a compressor and the temperature of an inner coil of an indoor heat exchanger; calculating the difference between the actual exhaust temperature and the temperature of the inner coil; judging whether the difference value is smaller than a preset temperature difference threshold value or not; and when the difference value is smaller than the temperature difference threshold value, controlling the electronic expansion valve to stop opening the valve.
For example, when the electronic expansion valve is opened at a valve opening speed of 1B/10s, the actual exhaust temperature Td of the compressor is 55 ℃, the inner coil temperature Tp is 46 ℃, and the difference Δ T between the two is Td-Tp is 9 ℃, because the actual exhaust temperature of the compressor is reduced and the flow speed of the refrigerant is increased during the opening of the electronic expansion valve, the heat exchange effect between the indoor heat exchanger and the indoor air is weakened, the indoor outlet air temperature is reduced, and the outlet air temperature fluctuates, at this time, the electronic expansion valve is controlled to stop opening the valve, so as to slow down the fluctuation of the outlet air temperature.
Through the in-process that continuously opens the valve at electronic expansion valve, judge the difference and the size of presetting the difference threshold value of the actual exhaust temperature of compressor and interior coil pipe temperature to control electronic expansion valve and stop opening the valve when the difference is less than and predetermine the difference threshold value, the control method of this application can also follow user experience's aspect on the basis of delaying the speed of frosting, stops opening the valve when the difference is less than and predetermines the difference threshold value, reduces indoor air-out temperature's fluctuation, guarantees user experience.
In one possible embodiment, the heating control method of the present application further includes:
and when the temperature of the outer coil pipe is greater than or equal to the first temperature threshold value, controlling the opening degree of the electronic expansion valve according to the target exhaust temperature of the compressor.
Taking the first temperature threshold value as 0 ℃ as an example, when the temperature Te of the external coil is more than or equal to 0 ℃, the frosting risk of the outdoor heat exchanger is low, and the opening degree of the electronic expansion valve is controlled according to the target exhaust temperature so as to exert the maximum heating capacity of the system. Wherein, more preferably, the target discharge temperature is determined based on the outdoor ambient temperature and the operating frequency of the compressor.
For example, the target exhaust temperature is determined based on the following equation (3):
Tt＝Int(a×f+b×Tao+c) (3)
in the formula (3), Tt is a target exhaust gas temperature; int () is a rounding operation; f is the running power of the compressor; tao is the outdoor ambient temperature; a. b and c are constants. The determination method of a, b, and c may be determined based on an experimental method, or may be determined based on experience, and is not described herein again.
After the target exhaust temperature is determined, controlling the opening degree of the electronic expansion valve based on the target exhaust temperature, namely when the actual exhaust temperature of the compressor is lower than the target exhaust temperature, controlling the electronic expansion valve to reduce the opening degree to increase the actual exhaust temperature; and conversely, when the actual exhaust temperature of the compressor is greater than the target exhaust temperature, the actual exhaust temperature is reduced by controlling the electronic expansion valve to increase the opening degree.
In one possible embodiment, the heating control method of the present application further includes:
and controlling the air conditioner to operate in a defrosting mode when the temperature of the outer coil pipe is less than the condensation temperature and lasts for a second preset time length.
Still take the condensation temperature Tes ═ 3 ℃ as an example, the second preset time period may be 2min, when the temperature Te of the external coil pipe is less than-3 ℃ and lasts for 2min, it is proved that the frosting of the outdoor heat exchanger is serious at this time, and the defrosting operation needs to be carried out immediately. And controlling the air conditioner to enter a defrosting mode to operate. The defrosting mode may be a refrigeration defrosting mode (a four-way valve is switched, a refrigeration mode is operated, and a refrigerant is reversely circulated) or a bypass defrosting mode (a loop is separately led out from a high-pressure end of the compressor to the outdoor heat exchanger).
Of course, the second preset duration is not limited to the above 2min, and those skilled in the art can adjust the second preset duration, so that the adjusted scheme is suitable for a more specific application scenario. For example, the second preset time period may be 1min, 3min, 5min, and the like.
It should be noted that the above preferred embodiments are only used for illustrating the principle of the present application, and are not intended to limit the protection scope of the present application. Without departing from the principles of the present application, those skilled in the art can adjust the setting manner, so that the present application can be applied to more specific application scenarios.
For example, in an alternative embodiment, the way of determining the dew temperature is not constant, and one skilled in the art can adjust the way of determining the dew temperature without departing from the principles of the present application, provided that the dew temperature of the outdoor environment can be reasonably determined. For example, in other embodiments, the condensation temperature may be determined by using the outdoor environment temperature and the outdoor environment humidity together, for example, by using a corresponding relationship table between the outdoor environment temperature, the outdoor environment humidity and the condensation temperature, or by using an empirical formula or a fitting formula based on the three.
For another example, in another alternative embodiment, specific values of the first temperature threshold, the second temperature threshold and the third temperature threshold are not limited thereto, and those skilled in the art can adjust the above thresholds based on specific application scenarios, so that the present application can be applied to more specific application scenarios. For example, the first temperature threshold may be suitably increased or decreased, and the second temperature threshold and the third temperature threshold may be determined based on a correlation with the condensation temperature.
As another example, in another alternative embodiment, the fixed opening degree is not determined in an exclusive manner, and in other embodiments, the fixed opening degree may be determined by:
and when the temperature of the outer coil is smaller than the first temperature threshold value and larger than or equal to the second temperature threshold value, controlling the opening degree of the electronic expansion valve according to the target exhaust temperature of the compressor, and determining the fixed opening degree as the opening degree after the temperature of the outer coil is in the current temperature range and lasts for a first preset time. Taking Tes ═ 3 ℃, T1 ═ 0 ℃, T2 ═ 1 ℃, and T3 ═ 2 ℃ as examples, the first preset time may be 2min, under the condition that the temperature of the outer coil pipe satisfies-1 ≤ Te < 0, the electronic expansion valve is first adjusted according to the target exhaust temperature, when-1 ≤ Te < 0 lasts for 2min, the opening degree of the electronic expansion valve at 2min is taken as the fixed opening degree, and the electronic expansion valve is controlled to keep the opening degree unchanged.
The applicant finds that the opening degree of the electronic expansion valve can be buffered by controlling the opening degree of the electronic expansion valve according to the target exhaust temperature and then controlling the electronic expansion valve to be kept at a fixed opening degree when the target exhaust temperature is less than the first temperature threshold value and more than or equal to the second temperature threshold value, so that the stability of the heating process is ensured, and the operation noise and the fluctuation of the outlet air temperature caused by the sudden change of the opening degree when the electronic expansion valve is adjusted to the fixed opening degree are avoided.
For another example, in another alternative embodiment, the above embodiment is described with the target discharge temperature being determined based on the outdoor ambient temperature and the operating frequency of the compressor, but this determination is merely a preferred embodiment and those skilled in the art can substitute the above embodiment as long as the substituted embodiment can approximately determine a reasonable target discharge temperature. For example, the target discharge temperature may also be determined based on a correspondence between the operating frequency of the compressor and the target discharge temperature, or based on a correspondence table between the target discharge temperature and the outdoor ambient temperature and the frequency of the compressor, or the like.
For another example, in another alternative embodiment, although the foregoing embodiment describes the division of the temperature interval with reference to the second temperature threshold and the third temperature threshold, such a division manner of the temperature interval is not limited thereto, and in other embodiments, a person skilled in the art may select a specific division manner based on a specific application scenario, for example, the temperature interval may be divided by using only the second temperature threshold, or the temperature interval may be divided in more detail by further adding other temperature thresholds, and the like.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
One possible control procedure of the present application is briefly described below with reference to fig. 2. Fig. 2 is a logic diagram of a possible embodiment of a heating control method of an air conditioner according to the present invention.
As shown in fig. 2, in one possible control process, the complete flow of the heating control method of the air conditioner may be:
s301, acquiring the outdoor environment temperature Tao and the outer coil temperature Te, and then executing the step S303;
s303, acquiring the first temperature threshold T1 being 0 ℃, calculating the condensation temperature Tes based on the outdoor ambient temperature Tao, determining the second temperature threshold T2 and the third temperature threshold T3 based on the condensation temperature, and then executing step S305;
s305, judging whether Tes is less than Te and less than T1? If yes, executing step S307, otherwise, executing step S323;
s307, further determine if T2 ≦ Te < T1? If so, executing step S309, otherwise, executing step S311;
s309, calculating a fixed opening degree P, and adjusting the opening degree of the electronic expansion valve to the fixed opening degree P;
s311, further determine if T3 ≦ Te < T2? If yes, executing step S313, otherwise, executing step S315;
s313, controlling the electronic expansion valve to open at the speed of 1B/10S, and then executing the step S317;
s315, controlling the electronic expansion valve to open at the speed of 1B/5S, and then executing the step S317;
s317, acquiring an actual discharge temperature Td of the compressor and an inner coil temperature Tp, calculating a difference Δ T between the actual discharge temperature Td and the inner coil temperature Tp to be Td-Tp, and then executing step S319;
s319, determining whether Δ T < 10? If yes, executing step S321, otherwise, returning to execute step S307;
s321, controlling the electronic expansion valve to stop opening the valve;
s323, determine Te > T1, and? If yes, executing step S325, otherwise, executing step S327;
s325, controlling the opening degree P of the electronic expansion valve according to the target exhaust temperature;
s327, further determine whether Te is less than or equal to Tes and lasts for 2 min? If yes, executing step S329, otherwise, returning to execute step S301;
and S329, operating the air conditioner in a defrosting mode.
It should be noted that although the detailed steps of the method of the present application have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present application, and the modified technical solution does not change the basic concept of the present application and therefore falls into the protection scope of the present application. For example, the execution sequence of step S101 and step S103 is not limited to the above-mentioned sequence, and step S103 may be executed first and then step S101 may be executed, or step S101 and step S103 may be executed simultaneously, which is not limited in this application.
So far, the technical solutions of the present application have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present application is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the present application, and the technical scheme after the changes or substitutions will fall into the protection scope of the present application.
Claims (10)
1. A heating control method of an air conditioner is characterized in that the air conditioner comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger and a throttle valve with controllable opening degree,
the heating control method comprises the following steps:
determining a condensation temperature of an outdoor environment;
acquiring the temperature of an outer coil of the outdoor heat exchanger;
comparing the temperature of the outer coil with a first temperature threshold and the magnitude of the condensation temperature;
and when the temperature of the outer coil is smaller than the first temperature threshold and is larger than or equal to the condensation temperature, adjusting the opening of the throttle valve according to the temperature interval of the temperature of the outer coil.
2. The heating control method of the air conditioner according to claim 1, wherein the step of adjusting the opening degree of the throttle valve according to the temperature zone in which the temperature of the outer coil is located further comprises:
comparing the temperature of the outer coil to a second temperature threshold and a third temperature threshold;
adjusting the opening of the throttle valve according to the comparison result;
wherein the first temperature threshold, the second temperature threshold, the third temperature threshold, and the dew temperature decrease sequentially.
3. The heating control method of an air conditioner according to claim 2, wherein the step of adjusting the opening degree of the throttle valve according to the comparison result further comprises:
when the temperature of the outer coil is smaller than the first temperature threshold and larger than or equal to the second temperature threshold, controlling the throttle valve to adjust to a fixed opening degree;
when the temperature of the external coil is smaller than the second temperature threshold and is larger than or equal to the third temperature threshold, controlling the throttle valve to be continuously opened at a first opening speed;
when the temperature of the external coil pipe is smaller than a third temperature threshold value and is larger than or equal to the condensation temperature, controlling the throttle valve to be continuously opened at a second opening speed;
wherein the first valve opening speed is less than the second valve opening speed.
4. The heating control method of an air conditioner according to claim 3, wherein the fixed opening degree is determined based on an outdoor ambient temperature and an operation frequency of the compressor; or
The fixed opening is determined by:
when the temperature of the outer coil pipe is smaller than the first temperature threshold value and larger than or equal to the second temperature threshold value, the opening degree of the throttle valve is controlled according to the target exhaust temperature of the compressor, and the fixed opening degree is the opening degree of the outer coil pipe after the temperature of the outer coil pipe is in the current temperature interval and lasts for a first preset time.
5. The heating control method of an air conditioner according to claim 3, wherein the heating control method further includes, while the throttle valve is continuously opened:
acquiring the actual exhaust temperature of the compressor and the temperature of an inner coil of the indoor heat exchanger;
calculating a difference between the actual exhaust temperature and the inner coil temperature;
judging whether the difference value is smaller than a preset temperature difference threshold value or not;
and when the difference value is smaller than the temperature difference threshold value, controlling the throttle valve to stop opening.
6. A heating control method of an air conditioner according to claim 2, wherein the second temperature threshold and the third temperature threshold are determined based on the dew condensation temperature.
7. The heating control method of an air conditioner according to claim 1, further comprising:
and when the temperature of the external coil is greater than or equal to the first temperature threshold value, controlling the opening of the throttle valve according to the target exhaust temperature of the compressor.
8. The heating control method of an air conditioner according to claim 7, wherein the target discharge air temperature is determined based on an outdoor ambient temperature and an operation frequency of the compressor.
9. The heating control method of an air conditioner according to claim 1, further comprising:
and when the temperature of the outer coil pipe is less than the condensation temperature and lasts for a second preset time length, controlling the air conditioner to operate in a defrosting mode.
10. The heating control method of an air conditioner according to claim 1, wherein the step of determining the dew temperature of the outdoor environment further comprises:
acquiring the outdoor environment temperature;
and determining the condensation temperature according to the outdoor environment temperature.
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| PCT/CN2021/129822 WO2022068968A1 (en) | 2021-04-08 | 2021-11-10 | Heating control method for air conditioner |
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| CN115307273A (en) * | 2022-08-16 | 2022-11-08 | 珠海格力电器股份有限公司 | Defrosting control method and device based on fuzzy algorithm, air conditioner and storage medium |
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| CN114857749B (en) * | 2022-04-29 | 2023-10-13 | 海信（广东）空调有限公司 | Air conditioner and method for controlling defrosting of air conditioner |
| CN115614925A (en) * | 2022-10-12 | 2023-01-17 | 宁波奥克斯电气股份有限公司 | Air conditioner, control method and device thereof and readable storage medium |
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