WO2021147534A1

WO2021147534A1 - Self-cleaning control method for air conditioner

Info

Publication number: WO2021147534A1
Application number: PCT/CN2020/134419
Authority: WO
Inventors: 许磊; 张晓迪; 张铭; 高强; 张东
Original assignee: 青岛海尔空调电子有限公司; 海尔智家股份有限公司
Priority date: 2020-01-22
Filing date: 2020-12-08
Publication date: 2021-07-29
Also published as: CN113154635B; CN113154635A

Abstract

A self-cleaning control method for an air conditioner. The method comprises the following steps: acquiring a first heat exchange pressure of an outdoor heat exchanger (S100); acquiring a second heat exchange pressure of an indoor heat exchanger (S200); determining whether a first difference value between the first heat exchange pressure and a first preset pressure threshold value is greater than a first preset difference threshold value (S300); determining whether a second difference value between the second heat exchange pressure and a second preset pressure threshold value is greater than a second preset difference threshold value (S400); and selectively making an air conditioner enter a self-cleaning mode according to a determination result of whether the first difference value is greater than the first preset difference threshold value and that of whether the second difference value is greater than the second preset difference threshold value (S500), so that whether the indoor heat exchanger and/or the outdoor heat exchanger needs to be cleaned can be accurately determined.

Description

Self-cleaning control method for air conditioner

Technical field

The invention relates to the technical field of air conditioners, and specifically provides a self-cleaning control method for an air conditioner.

Background technique

As a device that can adjust the indoor ambient temperature, the working principle of the air conditioner is as follows: the refrigerant passes through the high-pressure/low-pressure/gas/liquid state conversion between the circulating pipelines to reduce or increase the indoor ambient temperature, that is, from From the perspective of indoor heat exchangers, the air conditioner is in cooling or heating mode. During the operation of the air conditioner, various dust and impurities in the air will adhere to the indoor heat exchanger and the outdoor heat exchanger, causing serious dirt and blockage on the surface of the indoor heat exchanger and outdoor heat exchanger, which not only reduces the heat exchange effect , Affect the user experience, and will increase power consumption due to the increase in power consumption.

In order to solve the above-mentioned problems, the invention patent with publication number CN106594976B discloses a "cleaning method for the internal and external units of air conditioners". Specifically, the above-mentioned patent detects whether the high and low pressure difference of the air conditioner reaches the preset condition; when the high and low pressure difference of the air conditioner reaches the preset condition, the four-way valve is controlled to switch to switch the defrosting of the indoor and outdoor heat exchangers; when the following requirements are met When conditions are met, it is judged that the air conditioner high and low pressure pressure difference reaches the preset condition: Pi/Po≤A (Pi>Po); Pi is the evaporation saturation pressure corresponding to Ti, Po is the condensation saturation pressure corresponding to To, and A is between 1.1 and 3 During the self-cleaning of the air conditioner, both the indoor heat exchanger and the outdoor heat exchanger are self-cleaning. However, in the actual operation process, it is possible that the surface of the indoor heat exchanger or the outdoor heat exchanger is seriously blocked and needs to be self-cleaned. Both the indoor heat exchanger and the outdoor heat exchanger are self-cleaning, which causes a waste of resources. Affect user experience.

Therefore, a new self-cleaning control method for air conditioners is needed in the art to solve the above-mentioned problems.

Summary of the invention

In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the existing air conditioner cannot accurately determine the heat exchanger that needs self-cleaning, the present invention provides a self-cleaning control method for the air conditioner. The air conditioner includes For indoor heat exchangers and outdoor heat exchangers, the self-cleaning control method includes the following steps: obtaining the first heat exchange pressure of the outdoor heat exchanger; obtaining the second heat exchange pressure of the indoor heat exchanger; judging the first heat exchange pressure and the first heat exchange pressure Whether the first difference between a preset pressure threshold is greater than the first preset difference threshold; determine whether the second difference between the second heat exchange pressure and the second preset pressure threshold is greater than the second preset difference threshold; A determination result of whether a difference value is greater than a first preset difference value threshold and whether a second difference value is greater than a second preset difference value threshold value selectively causes the air conditioner to enter a self-cleaning mode.

In the preferred technical solution of the above self-cleaning control method, "according to the judgment result of whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset difference threshold, the air conditioner is selectively The step of entering the “self-cleaning mode” specifically includes: if the first difference is greater than the first preset difference threshold and the second difference is greater than the second preset difference threshold, then further judging the difference between the outlet air temperature of the indoor heat exchanger and the Whether the third difference of the preset temperature threshold is greater than the third preset difference threshold; according to the judgment result of whether the third difference is greater than the third preset difference threshold, the air conditioner enters the self-cleaning mode to exchange heat outside The heat exchanger and the indoor heat exchanger are self-cleaning or only the outdoor heat exchanger is self-cleaning.

In the preferred technical solution of the above-mentioned self-cleaning control method, “according to the judgment result of whether the third difference is greater than the third preset difference threshold, the air conditioner enters the self-cleaning mode, so as to control the outdoor heat exchanger and the indoor heat exchanger. The steps of “self-cleaning or self-cleaning only the outdoor heat exchanger” specifically include: if the third difference is greater than the third preset difference threshold, the air conditioner enters the self-cleaning mode, so as to clean the outdoor heat exchanger and the indoor heat exchanger. The heat exchanger is self-cleaning.

In the preferred technical solution of the above-mentioned self-cleaning control method, “according to the judgment result of whether the third difference is greater than the third preset difference threshold, the air conditioner enters the self-cleaning mode, so as to control the outdoor heat exchanger and the indoor heat exchanger. The step of “self-cleaning or self-cleaning only the outdoor heat exchanger” also includes: if the third difference is less than or equal to the third preset difference threshold, the air conditioner enters the self-cleaning mode, only for the outdoor heat exchanger Perform self-cleaning.

In the preferred technical solution of the above self-cleaning control method, "according to the judgment result of whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset difference threshold, the air conditioner is selectively The step of entering the self-cleaning mode" also includes: if the second difference is greater than the second preset difference threshold but the first difference is less than or equal to the first preset difference threshold, then further determining whether the third difference is greater than the first Three preset difference thresholds; according to the judgment result of whether the third difference is greater than the third preset difference threshold, the air conditioner is selectively brought into a self-cleaning mode.

In the preferred technical solution of the above self-cleaning control method, the step of "selectively entering the self-cleaning mode according to the judgment result of whether the third difference is greater than the third preset difference threshold" specifically includes: if the third difference is If the difference is greater than the third preset difference threshold, the air conditioner enters a self-cleaning mode, and only the indoor heat exchanger is self-cleaned.

In the preferred technical solution of the above-mentioned self-cleaning control method, the step of “selectively entering the self-cleaning mode of the air conditioner according to the judgment result of whether the third difference is greater than the third preset difference threshold” further includes: if the third difference If the difference is less than or equal to the third preset difference threshold, the air conditioner is maintained in the current operating mode and does not enter the self-cleaning mode.

In the preferred technical solution of the above self-cleaning control method, "according to the judgment result of whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset difference threshold, the air conditioner is selectively The step of entering the self-cleaning mode" also includes: if the first difference is greater than the first preset difference threshold but the second difference is less than or equal to the second preset difference threshold, then the air conditioner enters the self-cleaning mode. Self-cleaning the outdoor heat exchanger.

In the preferred technical solution of the above self-cleaning control method, "according to the judgment result of whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset difference threshold, the air conditioner is selectively The step of entering the self-cleaning mode also includes: if the first difference is less than or equal to the first preset difference threshold and the second difference is less than or equal to the second preset difference threshold, then the air conditioner is maintained in the current operating mode , Does not enter the self-cleaning mode.

In the preferred technical solution of the above self-cleaning control method, when the air conditioner enters the self-cleaning mode, the air conditioner self-cleans the outdoor heat exchanger and/or the indoor heat exchanger by first forming frost and then defrosting.

Those skilled in the art can understand that, in the preferred technical solution of the self-cleaning control method of the present invention, the first heat exchange pressure of the outdoor heat exchanger is obtained; the second heat exchange pressure of the indoor heat exchanger is obtained; and the first Whether the first difference between the heat exchange pressure and the first preset pressure threshold is greater than the first preset difference threshold; determine whether the second difference between the second heat exchange pressure and the second preset pressure threshold is greater than the second preset difference Value threshold; according to the judgment result of whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset difference threshold, selectively make the air conditioner enter the self-cleaning mode. Compared with the existing technical solution of judging whether the air conditioner high and low pressure differential pressure reaches the preset condition, the present invention controls the air conditioner to perform self-cleaning according to whether the first difference is greater than the first preset difference threshold. And whether the second difference value is greater than the second preset difference value threshold to accurately determine whether the indoor heat exchanger and/or outdoor heat exchanger needs to be cleaned, so that the indoor heat exchanger and/or outdoor heat exchange can be timely and accurately The self-cleaning of the air conditioner improves the self-cleaning performance of the air conditioner, avoids the waste of resources, and avoids the continuous operation of the indoor heat exchanger and/or the outdoor heat exchanger when the surface of the outdoor heat exchanger is dirty, and improves the indoor heat exchanger And/or the heat exchange effect of the outdoor heat exchanger reduces energy consumption, reduces power consumption, and therefore improves user experience.

Description of the drawings

Figure 1 is a flow chart of the self-cleaning control method of the present invention;

Fig. 2 is a flowchart of a self-cleaning control method according to an embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

Based on the technical problems raised in the background art, the present invention provides a self-cleaning control method for an air conditioner, which aims to determine whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second difference. The preset difference threshold accurately judges whether the indoor heat exchanger and/or outdoor heat exchanger needs to be cleaned, so that the indoor heat exchanger and/or outdoor heat exchanger can be self-cleaned in time and accurately, which improves the air conditioner The self-cleaning performance avoids the waste of resources, avoids continuing operation when the surface of the indoor heat exchanger and/or outdoor heat exchanger is seriously blocked, and improves the exchange rate of the indoor heat exchanger and/or outdoor heat exchanger. The thermal effect reduces energy consumption and power consumption, and therefore improves the user experience.

1 and 2, FIG. 1 is a flow chart of the self-cleaning control method of the present invention; FIG. 2 is a flow chart of the self-cleaning control method of an embodiment of the present invention. As shown in Figure 1, the air conditioner includes an indoor heat exchanger and an outdoor heat exchanger. The self-cleaning control method of the present invention includes the following steps:

S100. Obtain the first heat exchange pressure of the outdoor heat exchanger;

S200. Obtain the second heat exchange pressure of the indoor heat exchanger;

S300: Determine whether the first difference between the first heat exchange pressure and the first preset pressure threshold is greater than the first preset difference threshold;

S400: Determine whether the second difference between the second heat exchange pressure and the second preset pressure threshold is greater than the second preset difference threshold;

S500: According to a determination result of whether the first difference is greater than a first preset difference threshold and whether the second difference is greater than a second preset difference threshold, selectively make the air conditioner enter a self-cleaning mode.

Preferably, when the air conditioner enters the self-cleaning mode, the air conditioner performs self-cleaning on the outdoor heat exchanger and/or the indoor heat exchanger by first forming frost and then defrosting. Of course, the outdoor heat exchanger and/or indoor heat exchanger can also be self-cleaned by spray cleaning, or the outdoor heat exchanger and/or indoor heat exchanger can be self-cleaned by brushing. Those skilled in the art can flexibly adjust and set the self-cleaning method of the air conditioner in practical applications, no matter what method is adopted, as long as the outdoor heat exchanger and/or indoor heat exchanger can be cleaned.

It should be noted that in the above process, the order of execution of steps S100 to S400 is not limited to the order listed above. Steps S100 and S300 can also be executed first, and then steps S200 and S400 are executed; steps S200 and S400 can also be executed first. S400, step S100 and step S300 are performed again; it is also possible to perform step S100 and step S200 at the same time, and then perform step S300 and step S400 at the same time. Those skilled in the art can flexibly adjust and set the steps S100 to step S400 in actual applications. The execution sequence, such changes do not deviate from the principle and scope of the present invention.

In a preferred embodiment, when the air conditioner is running in the cooling mode, the first difference and the second difference are calculated according to the following formula:

Among them, the first difference:

△P ₁ ＝Px ₁ -Pb ₁

Among them, △P ₁ : the first difference;

Px ₁ : The first heat exchange pressure, that is, the actual condensing pressure of the outdoor heat exchanger;

Pb ₁ : The first preset pressure threshold, that is, the set condensing pressure of the outdoor heat exchanger.

Among them, the second difference:

△P ₂ ＝Pa ₁ -Pn ₁

Among them, △P ₂ : the second difference;

Pn ₁ : The second heat exchange pressure, that is, the actual evaporation pressure of the indoor heat exchanger;

Pa ₁ : The second preset pressure threshold, that is, the set evaporation pressure of the indoor heat exchanger.

When the air conditioner is running in heating mode, the first difference and the second difference are calculated according to the following formula:

Among them, the first difference:

△P ₁ ＝Pa ₂ -Pn ₂

Among them, △P ₁ : the first difference;

Pn ₂ : The first heat exchange pressure, that is, the actual evaporation pressure of the outdoor heat exchanger;

Pa ₂ : The first preset pressure threshold, that is, the set evaporation pressure of the outdoor heat exchanger.

Among them, the second difference:

△P ₂ ＝Px ₂ -Pb ₂

Among them, △P ₂ : the second difference;

Px ₂ : The first heat exchange pressure, that is, the actual condensing pressure of the indoor heat exchanger;

Pb ₂ : The first preset pressure threshold, that is, the set condensing pressure of the indoor heat exchanger.

Preferably, the first heat exchange pressure and the first preset pressure threshold, and the second heat exchange pressure and the second preset pressure threshold are at the same air conditioner start-up temperature Ts, wind speed V actually detected pressure and preset pressure. Furthermore, the preset pressure corresponding to the temperature is set under the conditions of different outdoor environmental temperatures Tao, and the actual pressure is detected under the conditions of different outdoor environmental temperatures Tao.

Further, the first preset pressure threshold and the second preset pressure threshold may be experimental pressures obtained by those skilled in the art based on experiments under specific working conditions, or empirical pressures obtained based on experience. Those skilled in the art can It is the application to flexibly adjust and set the first preset pressure threshold and the second preset pressure threshold.

In a preferred embodiment, in the above step S500, "according to the judgment result of whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset difference threshold, select The steps to make the air conditioner enter the self-cleaning mode include:

S510. If the first difference is greater than the first preset difference threshold and the second difference is greater than the second preset difference threshold, further determine the third difference between the outlet air temperature of the indoor heat exchanger and the preset temperature threshold Whether it is greater than the third preset difference threshold;

S520. Make the air conditioner enter the self-cleaning mode according to the judgment result of whether the third difference is greater than the third preset difference threshold, so as to perform self-cleaning on the outdoor heat exchanger and the indoor heat exchanger, or perform self-cleaning on the outdoor heat exchanger only. Self-cleaning.

In step S510, if the first difference value is greater than the first preset difference value threshold, it means that a large amount of dust and impurities are attached to the surface of the outdoor heat exchanger, and the degree of dirty blockage is relatively serious, resulting in a significant reduction in the heat exchange effect. The heat exchanger is self-cleaning; if the second difference is greater than the second preset difference threshold, it means that dust and impurities are attached to the surface of the indoor heat exchanger, which causes the heat exchange effect to decrease. In order to accurately determine the dirtyness of the indoor heat exchanger Whether the degree of clogging is serious and self-cleaning is required, it is further judged whether the third difference between the outlet air temperature of the indoor heat exchanger and the preset temperature threshold is greater than the third preset difference threshold, and the air conditioner is turned on according to the judgment result. The device enters the self-cleaning mode to self-clean the outdoor heat exchanger and the indoor heat exchanger or only the outdoor heat exchanger.

Preferably, in step S520, "according to the judgment result of whether the third difference value is greater than the third preset difference value threshold, the air conditioner enters the self-cleaning mode, so as to self-clean the outdoor heat exchanger and the indoor heat exchanger or only The steps of "self-cleaning the outdoor heat exchanger" specifically include:

S521. If the third difference value is greater than the third preset difference value threshold, the air conditioner enters a self-cleaning mode to self-clean the outdoor heat exchanger and the indoor heat exchanger;

S522: If the third difference value is less than or equal to the third preset difference value threshold, the air conditioner is brought into a self-cleaning mode, and only the outdoor heat exchanger is self-cleaned.

In step S521, if the third difference value is greater than the third preset difference value threshold, it indicates that a large amount of dust and impurities are attached to the surface of the indoor heat exchanger, and the degree of dirty blockage is relatively serious, resulting in a significant reduction in the heat exchange effect. When the air conditioner is running In the cooling mode, the actual outlet temperature is significantly higher than the preset outlet temperature, which cannot meet the usage requirements. When the air conditioner is running in the heating mode, the actual outlet temperature is significantly lower than the preset outlet temperature, which cannot meet the requirements. If required, the indoor heat exchanger needs to be self-cleaned, and it is determined in step S510 that the outdoor heat exchanger needs to be self-cleaned. Then the air conditioner enters the self-cleaning mode, and the outdoor heat exchanger and the indoor heat exchanger are self-cleaned. clean.

In step S522, if the third difference is less than or equal to the third preset difference threshold, it means that a small amount of dust and impurities are attached to the surface of the indoor heat exchanger, and the degree of clogging is relatively light, although the heat exchange effect is reduced. However, when the air conditioner is running in cooling mode, the actual air outlet temperature is only slightly higher than the preset air temperature, which can meet the usage requirements within the error range. When the air conditioner is running in heating mode, the actual air outlet temperature is only slightly lower than the preset air temperature. The set air outlet temperature is within the error range and can meet the usage requirements. There is no need to self-clean the indoor heat exchanger for the time being; however, since it is determined in step S510 that the outdoor heat exchanger needs to be self-cleaned, the air conditioner is allowed to enter Self-cleaning mode, only the outdoor heat exchanger is self-cleaning.

In the above step S500, "selectively make the air conditioner enter the self-cleaning mode according to the judgment result of whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset difference threshold" The steps also include:

S530: If the second difference value is greater than the second preset difference value threshold but the first difference value is less than or equal to the first preset difference value threshold value, further determine whether the third difference value is greater than the third preset difference value threshold value;

S540: According to the judgment result of whether the third difference value is greater than the third preset difference value threshold, selectively make the air conditioner enter the self-cleaning mode.

In step S530, if the first difference is less than or equal to the first preset difference threshold, it indicates that the surface of the outdoor heat exchanger is attached or has a small amount of dust and impurities attached, and the degree of dirtiness is relatively light, and the heat exchange effect has not been affected. There is no need to self-clean the outdoor heat exchanger; if the second difference is greater than the second preset difference threshold, it means that dust and impurities are attached to the surface of the indoor heat exchanger, which reduces the heat exchange effect. In order to accurately judge the indoor heat exchange Whether the degree of dirty blockage of the heat exchanger is serious and self-cleaning is required, it is further judged whether the third difference between the outlet air temperature of the indoor heat exchanger and the preset temperature threshold is greater than the third preset difference threshold, and according to the judgment result , Selectively make the air conditioner enter the self-cleaning mode.

Preferably, in step S540, the step of "selectively making the air conditioner enter the self-cleaning mode according to the judgment result of whether the third difference is greater than the third preset difference threshold" specifically includes:

S541: If the third difference value is greater than the third preset difference value threshold, the air conditioner enters a self-cleaning mode, and only the indoor heat exchanger is self-cleaned;

S542: If the third difference value is less than or equal to the third preset difference value threshold, the air conditioner is maintained in the current operation mode and does not enter the self-cleaning mode.

In step S541, if the third difference value is greater than the third preset difference value threshold, it means that a large amount of dust and impurities are attached to the surface of the indoor heat exchanger, and the degree of clogging is relatively serious, resulting in a significant reduction in the heat exchange effect. When the air conditioner is running In the cooling mode, the actual outlet temperature is significantly higher than the preset outlet temperature, which cannot meet the usage requirements. When the air conditioner is running in the heating mode, the actual outlet temperature is significantly lower than the preset outlet temperature, which cannot meet the requirements. As required, the indoor heat exchanger needs to be self-cleaned. However, since it is determined in step S530 that the outdoor heat exchanger does not need to be self-cleaned, the air conditioner enters the self-cleaning mode, and only the indoor heat exchanger is self-cleaned.

In step S542, if the third difference is less than or equal to the third preset difference threshold, it means that a small amount of dust and impurities are attached to the surface of the indoor heat exchanger, and the degree of clogging is relatively light, although the heat exchange effect is reduced. However, when the air conditioner is running in cooling mode, the actual air outlet temperature is only slightly higher than the preset air temperature, which can meet the usage requirements within the error range. When the air conditioner is running in heating mode, the actual air outlet temperature is only slightly lower than the preset air temperature. The set air outlet temperature is within the error range, which can meet the use requirements, and there is no need to self-clean the indoor heat exchanger for the time being; moreover, since it is determined in step S530 that the outdoor heat exchanger does not need to be self-cleaned, the air conditioner is maintained The current operating mode does not enter the self-cleaning mode.

In the above process, when the air conditioner is running in the cooling mode, the third difference is calculated according to the following formula:

△T ₃ ＝Tx ₁ -T ₁

Among them, △T ₃ : the third difference;

Tx ₁ : The outlet air temperature, that is, the actual outlet air temperature of the indoor heat exchanger;

T ₁ : The preset temperature threshold, that is, the preset air outlet temperature of the indoor heat exchanger.

When the air conditioner is running in heating mode, the third difference is calculated according to the following formula:

△T ₃ ＝T ₂ -Tx ₂

Among them, △T ₃ : the third difference;

Tx ₂ : Outlet air temperature, that is, the actual outlet air temperature of the indoor heat exchanger;

T ₂ : The preset temperature threshold, that is, the preset air outlet temperature of the indoor heat exchanger.

Preferably, the outlet air temperature and the preset temperature threshold are the actual detected outlet air temperature and the preset temperature at the same air conditioner startup temperature Ts and wind speed V. And further set the preset temperature corresponding to the temperature under the condition of different outdoor environment temperature Tao, and detect the actual outlet temperature under the condition of different outdoor environment temperature Tao.

Further, the preset temperature threshold may be an experimental temperature obtained by a person skilled in the art based on experiments under specific working conditions, or an empirical temperature obtained based on experience, and those skilled in the art may flexibly adjust and set the preset temperature in the application. Set the temperature threshold.

S550: If the first difference is greater than the first preset difference threshold but the second difference is less than or equal to the second preset difference threshold, the air conditioner enters a self-cleaning mode, and only the outdoor heat exchanger is self-cleaned.

S560. If the first difference is less than or equal to the first preset difference threshold and the second difference is less than or equal to the second preset difference threshold, the air conditioner is maintained in the current operating mode and does not enter the self-cleaning mode.

In step S550, if the second difference is less than or equal to the second preset difference threshold, it indicates that the surface of the indoor heat exchanger is attached or has a small amount of dust and impurities attached, and the degree of clogging is relatively light, and the heat exchange effect has not been affected. There is no need to self-clean the indoor heat exchanger; if the first difference is greater than the first preset difference threshold, it means that a large amount of dust and impurities are attached to the surface of the outdoor heat exchanger, and the degree of clogging is serious, which leads to the heat exchange effect If the outdoor heat exchanger needs to be self-cleaned, the air conditioner enters the self-cleaning mode, and the outdoor heat exchanger is self-cleaned.

In step S560, if the first difference value is less than or equal to the first preset difference value threshold, it means that the surface of the outdoor heat exchanger is attached or has a small amount of dust and impurities attached, and the degree of clogging is relatively light, and the heat exchange effect has not been affected. There is no need to self-clean the outdoor heat exchanger. If the second difference is less than or equal to the second preset difference threshold, it means that the surface of the indoor heat exchanger is attached or has a small amount of dust and impurities attached, and the degree of clogging is relatively light. The heat exchange effect has not been affected, and there is no need to self-clean the indoor heat exchanger; the air conditioner is maintained in the current operating mode and does not enter the self-cleaning mode.

In the above process, the first preset difference threshold, the second preset difference threshold, and the third preset difference threshold are set to determine whether the air conditioner enters the self-cleaning mode. Wherein, the first preset difference threshold may be the smallest deviation from the second preset pressure threshold when the surface of the outdoor heat exchanger is relatively dirty, and the second preset difference threshold may be that the surface of the indoor heat exchanger is relatively dirty. The minimum deviation between the first preset pressure threshold and the third preset difference threshold may be the minimum deviation from the preset temperature threshold when the surface of the indoor heat exchanger is seriously clogged. Of course, the first preset difference threshold, the second preset difference threshold, and the third preset difference threshold are not limited to the numerical values in the above examples, and may also be other numerical values. The experimental value obtained, or the empirical value based on experience, as long as the boundary point determined by the first preset difference threshold, the second preset difference threshold, and the third preset difference threshold can meet the judgment of outdoor exchange The heat exchanger and/or indoor heat exchanger need to be self-cleaning.

Referring now to FIG. 2, FIG. 2 is a flowchart of a self-cleaning control method according to an embodiment of the present invention.

As shown in FIG. 2, in a possible implementation manner, the process of the self-cleaning control method for an air conditioner of the present invention may be: taking an air conditioner operating cooling mode as an example;

S100. Obtain the first heat exchange pressure of the outdoor heat exchanger when the air conditioner is operating in the cooling mode;

S210. If yes, obtain the second heat exchange pressure of the indoor heat exchanger; otherwise, perform step S220;

S410: Determine whether the second difference between the second heat exchange pressure and the second preset pressure threshold is greater than the second preset difference threshold;

S510. If yes, determine whether the third difference between the outlet air temperature of the indoor heat exchanger and the preset temperature threshold is greater than the third preset difference threshold; otherwise, perform step S550;

S521. If yes, make the air conditioner enter a self-cleaning mode to self-clean the outdoor heat exchanger and the indoor heat exchanger;

S522. If not, make the air conditioner enter the self-cleaning mode, and only perform self-cleaning on the outdoor heat exchanger;

S550. Make the air conditioner enter the self-cleaning mode, and only self-clean the outdoor heat exchanger;

S220. Obtain the second heat exchange pressure of the indoor heat exchanger;

S420: Determine whether the second difference between the second heat exchange pressure and the second preset pressure threshold is greater than the second preset difference threshold;

S530. If yes, determine whether the third difference between the outlet air temperature of the indoor heat exchanger and the preset temperature threshold is greater than the third preset difference threshold; otherwise, perform step S560;

S541. If yes, make the air conditioner enter the self-cleaning mode, and only self-clean the indoor heat exchanger;

S542. If not, keep the air conditioner in the cooling mode and not enter the self-cleaning mode;

S560. The air conditioner is maintained in a cooling mode and does not enter a self-cleaning mode.

It should be pointed out that the above-mentioned embodiment is only a preferred embodiment of the present invention. It is only used to illustrate the principle of the method of the present invention, and is not intended to limit the protection scope of the present invention. In practical applications, those skilled in the art The above-mentioned function allocation can be completed by different steps according to needs, that is, the steps in the embodiments of the present invention are further decomposed or combined. For example, the steps in the above-mentioned embodiments can be combined into one step, or can be further divided into multiple sub-steps to complete all or part of the functions described above. The names of the steps involved in the embodiments of the present invention are only for distinguishing the various steps, and are not regarded as a limitation of the present invention.

In addition, although not shown in the figure, the present invention also provides an air conditioner. The air conditioner includes a compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, a pressure sensor, a temperature sensor, and a control module. , Four-way valve, outdoor heat exchanger and indoor heat exchanger form a closed loop loop. The four-way valve makes the air-conditioning system in cooling mode or heating mode by way of reversing; the pressure sensor is used to detect the second of the outdoor heat exchanger A heat exchange pressure and the second heat exchange pressure of the indoor heat exchanger; a temperature sensor is used to detect the air outlet temperature of the indoor heat exchanger; the control module executes the self-cleaning procedure of the air conditioner based on the detection results of the pressure sensor and the temperature sensor .

Preferably, the pressure sensor includes a first pressure sensor and a second pressure sensor. The first pressure sensor is arranged on the outdoor heat exchanger to detect the heat exchange pressure of the outdoor heat exchanger; the second pressure sensor is arranged on the indoor heat exchanger. Above, it is used to detect the heat exchange pressure of the indoor heat exchanger.

Among them, the first pressure sensor, the second pressure sensor, and the temperature sensor are infrared temperature sensors, and can also be other types of sensors, such as radio frequency sensors. It should be noted that the first heat exchange pressure of the outdoor heat exchanger and the indoor heat exchange The detection method of the second heat exchange pressure of the heat exchanger and the outlet air temperature of the indoor heat exchanger should not constitute a limitation of the present invention.

Preferably, the control module may be the control module of the air conditioner itself, or may be an additional control module or other mobile terminal, which will not be repeated here. In physical form, the control module can be any type of controller, such as a programmable controller, a combinational logic controller, and so on.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, those skilled in the art will readily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

A self-cleaning control method for an air conditioner, the air conditioner comprising an outdoor heat exchanger and an indoor heat exchanger, characterized in that the self-cleaning control method includes the following steps:

Obtaining the first heat exchange pressure of the outdoor heat exchanger;

Obtaining the second heat exchange pressure of the indoor heat exchanger;

Judging whether the first difference between the first heat exchange pressure and the first preset pressure threshold is greater than the first preset difference threshold;

Judging whether the second difference between the second heat exchange pressure and the second preset pressure threshold is greater than the second preset difference threshold;

According to the judgment result of whether the first difference value is greater than the first preset difference value threshold and whether the second difference value is greater than the second preset difference value threshold value, the air conditioner is selectively allowed to enter the automatic Clean mode.
The self-cleaning control method according to claim 1, wherein "according to whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset As a result of the determination of the difference threshold, the step of selectively causing the air conditioner to enter the self-cleaning mode" specifically includes:

If the first difference is greater than the first preset difference threshold and the second difference is greater than the second preset difference threshold, then it is further determined that the outlet temperature of the indoor heat exchanger and the preset Set whether the third difference of the temperature threshold is greater than the third preset difference threshold;

According to the judgment result of whether the third difference value is greater than the third preset difference value threshold, the air conditioner enters a self-cleaning mode to perform self-cleaning on the outdoor heat exchanger and the indoor heat exchanger Or only the outdoor heat exchanger is self-cleaning.
The self-cleaning control method according to claim 2, wherein the air conditioner enters the self-cleaning mode according to the judgment result of whether the third difference value is greater than the third preset difference value threshold. The steps of "self-cleaning the outdoor heat exchanger and the indoor heat exchanger or self-cleaning only the outdoor heat exchanger" specifically include:

If the third difference is greater than the third preset difference threshold, the air conditioner is brought into a self-cleaning mode to self-clean the outdoor heat exchanger and the indoor heat exchanger.
The self-cleaning control method according to claim 2, wherein the air conditioner enters the self-cleaning mode according to the judgment result of whether the third difference value is greater than the third preset difference value threshold. The step of "self-cleaning the outdoor heat exchanger and the indoor heat exchanger or self-cleaning only the outdoor heat exchanger" also includes:

If the third difference is less than or equal to the third preset difference threshold, the air conditioner is brought into a self-cleaning mode, and only the outdoor heat exchanger is self-cleaned.
The self-cleaning control method according to claim 2, wherein "according to whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset As a result of the judgment of the difference threshold, the step of selectively making the air conditioner enter the self-cleaning mode" also includes:

If the second difference is greater than the second preset difference threshold but the first difference is less than or equal to the first preset difference threshold, then it is further determined whether the third difference is greater than the The third preset difference threshold;

According to the judgment result of whether the third difference value is greater than the third preset difference value threshold, the air conditioner is selectively brought into a self-cleaning mode.
The self-cleaning control method according to claim 5, characterized in that, "based on the judgment result of whether the third difference is greater than the third preset difference threshold, the air conditioner is selectively brought into self-cleaning The steps of the "mode" specifically include:

If the third difference is greater than the third preset difference threshold, the air conditioner is brought into a self-cleaning mode, and only the indoor heat exchanger is self-cleaned.
The self-cleaning control method according to claim 5, characterized in that, "according to the judgment result of whether the third difference is greater than the third preset difference threshold, the air conditioner is selectively allowed to enter the self-cleaning The steps of the mode" also include:

If the third difference is less than or equal to the third preset difference threshold, the air conditioner is maintained in the current operation mode and does not enter the self-cleaning mode.
The self-cleaning control method according to claim 1, wherein "according to whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset As a result of the judgment of the difference threshold, the step of selectively making the air conditioner enter the self-cleaning mode" also includes:

If the first difference value is greater than the first preset difference value threshold but the second difference value is less than or equal to the second preset difference value threshold, the air conditioner is made to enter the self-cleaning mode. The outdoor heat exchanger is self-cleaning.
The self-cleaning control method according to claim 1, wherein "according to whether the first difference is greater than the first preset difference threshold and whether the second difference is greater than the second preset As a result of the judgment of the difference threshold, the step of selectively making the air conditioner enter the self-cleaning mode" also includes:

If the first difference value is less than or equal to the first preset difference value threshold and the second difference value is less than or equal to the second preset difference value threshold value, then the air conditioner is maintained in the current operating mode, Does not enter the self-cleaning mode.
The self-cleaning control method according to any one of claims 1 to 9, characterized in that, when the air conditioner enters the self-cleaning mode, the air conditioner treats the outdoor by frosting first and then defrosting. The heat exchanger and/or the indoor heat exchanger is self-cleaning.