WO2023279916A1

WO2023279916A1 - Refrigerant leakage detection control method for air conditioner

Info

Publication number: WO2023279916A1
Application number: PCT/CN2022/098094
Authority: WO
Inventors: 王建营; 安超
Original assignee: 青岛海尔空调电子有限公司; 青岛海尔空调器有限总公司; 海尔智家股份有限公司
Priority date: 2021-07-08
Filing date: 2022-06-10
Publication date: 2023-01-12
Also published as: CN113639401A

Abstract

Provided is a refrigerant leakage detection control method for an air conditioner. The refrigerant leakage detection control method comprises: in an operating process of an air conditioner, acquiring, in real time, an exhaust temperature of a compressor, a coil temperature of an indoor unit, an operating frequency of the compressor, and an outdoor ambient temperature; according to the exhaust temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor, and the outdoor ambient temperature, determining whether refrigerant leakage occurs in the air conditioner; and where refrigerant leakage occurs in the air conditioner, making the compressor operate at a reduced frequency, and after a set time, selectively regulating the operating frequency of the compressor according to the exhaust temperature of the compressor. The accuracy of refrigerant leakage detection determination of an air conditioner can be improved, and when a refrigerant leaks, a compressor can be protected in a timely manner, thereby preventing the service life of the compressor from being affected.

Description

Refrigerant leakage detection and control method for air conditioner

technical field

The invention relates to the technical field of air conditioners, and specifically provides a method for detecting and controlling refrigerant leakage of an air conditioner.

Background technique

An air conditioner is a device capable of adjusting the indoor ambient temperature. It can reduce the indoor ambient temperature by cooling and increase the indoor ambient temperature by heating, thereby improving user comfort.

After the air conditioner runs for a long time, there may be a problem of refrigerant leakage. The refrigerant leakage of the air conditioner will not only reduce the refrigerant in the circulation pipeline of the air conditioner, which will affect the normal heat exchange of the air conditioner, but also cause leakage of refrigerant. It affects the operation of the air conditioner, especially the operation of the compressor.

In the prior art, the air conditioner has a single detection and determination method for refrigerant leakage, which is very prone to misjudgment. If there is a misjudgment, the air conditioner will adjust the operation strategy due to the misjudgment, which not only affects the normal heat exchange of the air conditioner , reduce the user's comfort experience, and frequently make meaningless adjustments to the compressor, reducing the service life of the compressor.

Therefore, there is a need in the art for a new refrigerant leakage detection and control method for an air conditioner to solve the above problems.

Contents of the invention

The present invention aims to solve the above-mentioned technical problems, that is, to solve the problem that the existing air conditioner has a single refrigerant leakage detection and determination method, is prone to misjudgment, and affects the service life of the compressor.

The present invention provides a method for detecting and controlling refrigerant leakage of an air conditioner. The method for detecting and controlling refrigerant leakage includes:

During the operation of the air conditioner, the exhaust temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor and the outdoor ambient temperature are obtained in real time;

According to the discharge temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor and the outdoor ambient temperature, determine whether the air conditioner has refrigerant leakage;

In the case of refrigerant leakage of the air conditioner, the frequency of the compressor is reduced and the operating frequency of the compressor is selectively adjusted according to the discharge temperature of the compressor after a set time.

In the preferred technical solution of the refrigerant leakage detection and control method above, "according to the discharge temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor, and the outdoor ambient temperature, it is determined that the Check whether the air conditioner has refrigerant leakage" The steps include:

When the air conditioner is in heating operation, determine whether the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than or equal to the first set value, and determine Whether the difference between the coil temperature of the indoor unit before the first preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second set value is determined to determine the second preset value of the compressor. Whether the difference between the operating frequency before the time and the operating frequency of the compressor at the current time is less than or equal to the third set value, and determine the difference between the outdoor ambient temperature before the third preset time and the outdoor ambient temperature at the current time Whether the absolute value of is less than the fourth set value;

According to the judgment result, it is judged whether the air conditioner has refrigerant leakage.

In the preferred technical solution of the above refrigerant leakage detection and control method, "judging whether the air conditioner has refrigerant leakage according to the judgment result" specifically includes:

If it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than or equal to the first set value, and it is determined that the first set value of the indoor unit is The difference between the coil temperature before the preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second set value, and it is determined that the temperature of the compressor before the second preset time is The difference between the operating frequency and the operating frequency of the compressor at the current time is less than or equal to the third set value, and the difference between the outdoor ambient temperature before the third preset time and the outdoor ambient temperature at the current time is determined If the absolute value of the value is smaller than the fourth set value, it is determined that the air conditioner has refrigerant leakage.

In the preferred technical solution of the refrigerant leakage detection control method above, "if it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than or equal to the first setting fixed value, and it is determined that the difference between the coil temperature of the indoor unit before the first preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second set value, and it is determined that The difference between the operating frequency of the compressor before the second preset time and the operating frequency of the compressor at the current time is less than or equal to the third set value, and it is determined that the third preset time If the absolute value of the difference between the previous outdoor ambient temperature and the current outdoor ambient temperature is less than the fourth set value, the step of determining that the air conditioner has refrigerant leakage” specifically includes:

If within the fourth preset time, it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than or equal to the first set value, and it is determined that the The difference between the coil temperature of the indoor unit before the first preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second set value, and it is determined that the compressor The difference between the operating frequency before the second preset time and the operating frequency of the compressor at the current time is less than or equal to the third set value, and it is determined that the outdoor ambient temperature before the third preset time is different from the If the absolute value of the difference of the outdoor ambient temperature at the current time is smaller than the fourth set value, it is determined that the air conditioner has refrigerant leakage.

In the case of the cooling operation of the air conditioner, further obtain the coil temperature of the outdoor unit;

judging whether the difference between the discharge temperature of the compressor at the current time and the coil temperature of the outdoor unit at the current time is greater than or equal to the fifth set value, and judging the temperature of the indoor unit before the fifth preset time Whether the difference between the coil temperature and the coil temperature of the indoor unit at the current time is greater than or equal to the sixth set value, and determine whether the operating frequency of the compressor before the sixth preset time is different from the current time of the compressor. Whether the difference between the operating frequency of the time is less than or equal to the seventh set value, and determine whether the absolute value of the difference between the outdoor ambient temperature before the seventh preset time and the outdoor ambient temperature at the current time is less than the eighth set value;

In the preferred technical solution of the above refrigerant leakage detection and control method, the step of "judging whether the air conditioner has refrigerant leakage according to the judgment result" specifically includes:

If it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the outdoor unit at the current time is greater than or equal to the fifth set value, and it is determined that the fifth set value of the indoor unit is The difference between the coil temperature before the preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the sixth set value, and it is determined that the temperature of the compressor before the sixth preset time is The difference between the operating frequency and the operating frequency of the compressor at the current time is less than or equal to the seventh set value, and the difference between the outdoor ambient temperature before the seventh preset time and the outdoor ambient temperature at the current time is determined If the absolute value of the value is smaller than the eighth set value, it is determined that the air conditioner has refrigerant leakage.

In the preferred technical solution of the above refrigerant leakage detection control method, "if it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the outdoor unit at the current time is greater than or equal to the fifth setting fixed value, and it is determined that the difference between the coil temperature of the indoor unit before the fifth preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the sixth set value, and it is determined that The difference between the operating frequency of the compressor before the sixth preset time and the operating frequency of the compressor at the current time is less than or equal to the seventh set value, and it is determined that the seventh preset time If the absolute value of the difference between the previous outdoor ambient temperature and the current outdoor ambient temperature is less than the eighth set value, the step of determining that the air conditioner has refrigerant leakage" specifically includes:

If within the eighth preset time, it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the outdoor unit at the current time is greater than or equal to the fifth set value, and it is determined that the The difference between the coil temperature of the indoor unit before the fifth preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the sixth set value, and it is determined that the compressor The difference between the operating frequency before the sixth preset time and the operating frequency of the compressor at the current time is less than or equal to the seventh set value, and it is determined that the outdoor ambient temperature before the seventh preset time is If the absolute value of the difference of the outdoor ambient temperature at the current time is smaller than the eighth set value, it is determined that the air conditioner has refrigerant leakage.

In the preferred technical solution of the above refrigerant leakage detection and control method, after the step of "selectively adjusting the operating frequency of the compressor according to the discharge temperature of the compressor", the refrigerant leakage detection and control method further includes:

The operating frequency of the compressor is selectively adjusted according to the discharge temperature of the compressor every said set time.

In the preferred technical solution of the above refrigerant leakage detection and control method, the step of "selectively adjusting the operating frequency of the compressor according to the discharge temperature of the compressor" includes:

In the case of the heating operation of the air conditioner, comparing the discharge temperature of the compressor with a first set temperature value;

If the discharge temperature of the compressor is greater than the first set temperature value, increasing the operating frequency of the compressor;

If the discharge temperature of the compressor is equal to the first set temperature value, keep the operating frequency of the compressor unchanged;

If the discharge temperature of the compressor is lower than the first set temperature value, the operating frequency of the compressor is reduced.

In the case of the cooling operation of the air conditioner, comparing the discharge temperature of the compressor with a second set temperature value;

If the discharge temperature of the compressor is greater than the second set temperature value, increasing the operating frequency of the compressor;

If the discharge temperature of the compressor is equal to the second set temperature value, keep the operating frequency of the compressor unchanged;

If the discharge temperature of the compressor is lower than the second set temperature value, the operating frequency of the compressor is reduced.

In the case of adopting the above-mentioned technical solution, the present invention makes a combined judgment based on the discharge temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor, and the outdoor ambient temperature, that is, the parameters of the air conditioner itself and the parameters of the non-air conditioner itself Combining the parameters of the air conditioner to reduce the impact of changes in the outdoor ambient temperature. At the same time, the combination of the parameters of the air conditioner itself that is most related to refrigerant leakage can be combined to judge, which can greatly improve the accuracy of refrigerant leakage detection and judgment. Once the refrigerant leakage is determined Leakage, use the discharge temperature of the compressor as a control strategy to adjust the operating frequency of the compressor, so that the discharge temperature of the compressor is always in a relatively stable range, and avoid the high discharge temperature of the compressor, which will affect the compressor. service life, thus protecting the compressor.

Further, reducing the frequency of the compressor in the event of refrigerant leakage can protect the compressor at the first time, and then selectively adjust the operating frequency of the compressor according to the discharge temperature of the compressor every set time to avoid The compressor is adjusted repeatedly in a short period of time, that is, to achieve a balance between the discharge temperature control of the compressor and the operation frequency adjustment, and to ensure the stable operation of the compressor from two aspects together to avoid affecting the service life of the compressor.

Description of drawings

Describe preferred embodiment of the present invention below in conjunction with accompanying drawing, in the accompanying drawing:

FIG. 1 is a flow chart of a method for detecting and controlling refrigerant leakage of an air conditioner according to the present invention.

detailed description

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. Those skilled in the art can make adjustments as needed so as to adapt to specific applications.

It should be noted that, in the description of the present invention, although the various steps of the control method of the present invention are described in a specific order in the application, these orders are not limiting, and without departing from the basic principle of the present invention , those skilled in the art may perform the steps in different orders. In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", and "eighth" are used for descriptive purposes only and do not Read as indicating or implying relative importance.

Based on the problems pointed out in the background technology that the refrigerant leakage detection and determination method of the existing air conditioner is single, misjudgment is extremely prone to occur, and the service life of the compressor is affected, the present invention provides a refrigerant leakage detection and control method of the air conditioner, aiming at Improve the accuracy of air conditioner refrigerant leakage detection and judgment, and protect the compressor in time when it is determined that the air conditioner has refrigerant leakage, so as to avoid affecting the service life of the compressor.

It should be noted that the inventors have done in-depth research on the leakage of air conditioner refrigerant, and compared the pros and cons of various parameters of the air conditioner itself when exploring the impact of refrigerant leakage on the air conditioner, and From numerous air conditioner parameters, the discharge temperature of the compressor, the coil temperature of the indoor unit and the operating frequency of the compressor are selected as the air conditioner related parameters for comprehensively judging the refrigerant leakage of the air conditioner. Compared with the opening degree of the electronic expansion valve, For parameters such as the speed of the fan of the indoor unit and the speed of the fan of the outdoor unit, the parameters of the air conditioner selected in the present invention can not only determine whether the air conditioner is leaking refrigerant, but also ensure the accuracy of the judgment. In other words, when exploring the impact of refrigerant leakage in the air conditioner, the inventor found that the refrigerant leakage has a huge impact on the compressor and the coil of the indoor unit, which is also more conducive to the combination judgment, while the fan speed of the indoor unit and the fan speed of the outdoor unit , it is affected by the degree of dirt on the fan, frost or condensed water, etc., which will affect the accuracy of the judgment of the refrigerant leakage of the air conditioner, which is not conducive to the accurate judgment of the refrigerant leakage of the air conditioner. At the same time, in addition to the parameters of the above-mentioned air conditioner itself, the present invention also selects the outdoor ambient temperature as the parameter of the non-air conditioner itself, thereby eliminating the influence of the outdoor ambient temperature and avoiding the temperature change of the outdoor environment from affecting the accuracy of refrigerant leakage. sex judgments.

For this reason, as shown in Figure 1, the refrigerant leakage detection and control method of the present invention includes:

During the operation of the air conditioner, obtain the discharge temperature TD of the compressor, the coil temperature TM of the indoor unit, the operating frequency F of the compressor, and the outdoor ambient temperature TAI in real time;

According to the discharge temperature TD of the compressor, the coil temperature TM of the indoor unit, the operating frequency F of the compressor and the outdoor ambient temperature TAI, determine whether the air conditioner has refrigerant leakage;

In the case of refrigerant leakage of the air conditioner, the frequency of the compressor is reduced and the operating frequency of the compressor is selectively adjusted according to the discharge temperature TD of the compressor after a set time.

Among the above, it is preferred to reduce the operating frequency of the compressor by 5 to 15HZ, preferably 10HZ, and the value range of the set time is preferably 15 to 25 minutes, and more preferably 20 minutes. Set the set time flexibly. After repeated research by the inventor, it is found that setting the frequency reduction and setting time of the compressor to the above-mentioned value range and optimal value can ensure that the discharge temperature of the compressor will not rise to an excessively high level within the setting time. temperature, and then selectively adjust the operating frequency of the compressor according to the discharge temperature of the compressor after the set time is up, which can ensure the guaranteed adjustment of the discharge temperature of the compressor, that is, the discharge temperature of the compressor The control and the operating frequency adjustment should be balanced to the greatest extent, so as to ensure the stable operation of the compressor from two aspects and avoid affecting the service life of the compressor.

Preferably, the step of "determining whether the air conditioner has refrigerant leakage according to the discharge temperature TD of the compressor, the coil temperature TM of the indoor unit, the operating frequency F of the compressor, and the outdoor ambient temperature TAI" specifically includes:

When the air conditioner is in heating operation, it is judged whether the difference TD2-TM2 between the discharge temperature TD2 of the compressor at the current time and the coil temperature TM2 of the indoor unit at the current time is greater than or equal to the first set value T1. Whether the difference ΔTM between the coil temperature TM1 before the first preset time t1 of the indoor unit and the coil temperature TM2 at the current time of the indoor unit is greater than or equal to the second set value T2, determine the second preset value of the compressor. Whether the difference ΔF between the operating frequency F1 before the time t2 and the operating frequency F2 of the compressor at the current time is less than or equal to the third set value F3, judge the difference between the outdoor ambient temperature TAI1 before the third preset time t3 and the current time Whether the absolute value ΔTAI of the difference between the outdoor ambient temperature TAI2 is less than the fourth set value T4;

It should be noted that, in the case of heating, among all the above-mentioned parameters of the air conditioner itself (that is, the discharge temperature TD of the compressor, the coil temperature TM of the indoor unit and the operating frequency F of the compressor), except for the In addition to calculating the difference between the operating frequency of the compressor at the time and the current time and the coil temperature of the indoor unit, the difference between the discharge temperature TD2 of the compressor at the current time and the coil temperature TM2 of the indoor unit at the current time is also designed. The value TD2-TM2 is compared with the first set value T1, so as to avoid the misjudgment caused by the abnormal operation of the compressor itself and the inaccurate detection of the coil temperature sensor of the indoor unit, that is, in extreme cases, the compressor itself has Abnormalities may occur that lead to deviations in the operating frequency of the compressor at the previous time and the current time, and the coil temperature of the indoor unit may also be detected abnormally due to its own reasons, but on this basis, it is also necessary to meet the requirements of TD2-TM2 and T1 The probability of the comparison condition is basically zero. Through the above logic design, the present invention can eliminate the misjudgment of refrigerant leakage in the heating condition of the air conditioner to the greatest extent, and ensure the detection accuracy of the refrigerant leakage of the air conditioner.

In a specific situation, if it is determined that the difference between the discharge temperature TD2 of the compressor at the current time and the coil temperature TM2 of the indoor unit at the current time TD2-TM2 is greater than or equal to the first set value T1, and it is determined that the indoor The difference ΔTM between the coil temperature TM1 before the first preset time t1 of the indoor unit and the coil temperature TM2 of the indoor unit at the current time is greater than or equal to the second set value T2, and the second preset time of the compressor is determined The difference ΔF between the operating frequency F1 before t2 and the operating frequency F2 of the compressor at the current time is less than or equal to the third set value F3, and it is determined that the outdoor ambient temperature TAI1 before the third preset time t3 is different from the outdoor temperature at the current time. If the absolute value ΔTAI of the difference of the ambient temperature TAI2 is less than the fourth set value T4, it is determined that the air conditioner has refrigerant leakage.

Further preferably, a time limit can be added to the aforementioned conditions of TD2-TM2≥T1, ΔTM≥T2, ΔF≤F3 and ΔTAI<T4, that is, the air conditioner can only be judged if the above conditions are met within the time limit. Refrigerant leakage of the air conditioner, thereby further improving the accuracy of detection. After testing by the inventor, under this condition, the possibility of misjudgment of the air conditioner is basically zero. That is, if within the fourth preset time t4, if it is determined that the difference between the discharge temperature TD2 of the compressor at the current time and the coil temperature TM2 of the indoor unit at the current time TD2-TM2 is greater than or equal to the first set value T1 , and it is determined that the difference ΔTM between the coil temperature TM1 of the indoor unit before the first preset time t1 and the coil temperature TM2 of the indoor unit at the current time is greater than or equal to the second set value T2, and it is determined that the first preset value of the compressor is T2 The difference ΔF between the operating frequency F1 before the second preset time t2 and the operating frequency F2 of the compressor at the current time is less than or equal to the third set value F3, and it is determined that the outdoor ambient temperature TAI1 before the third preset time t3 and Only when the absolute value ΔTAI of the difference between the outdoor ambient temperature TAI2 at the current time is smaller than the fourth set value T4 is it determined that the air conditioner has refrigerant leakage.

Further, in the above, if TD2-TM2<T1, ΔTM<T2, ΔF>F3 or ΔTAI≥T4, it is determined that no refrigerant leakage occurs in the air conditioner.

In the case of cooling operation of the air conditioner, the coil temperature TC of the outdoor unit is further obtained;

Judging whether the difference TD2-TC2 between the exhaust temperature TD2 of the compressor at the current time and the coil temperature TC2 of the outdoor unit is greater than or equal to the fifth set value T5, and judging whether the fifth preset time t5 of the indoor unit is before Whether the difference ΔTM between the coil temperature TM1 of the indoor unit and the coil temperature TM2 of the indoor unit at the current time is greater than or equal to the sixth set value T6, and judge whether the operating frequency F1 of the compressor before the sixth preset time t6 and the compressor Whether the difference ΔF of the operating frequency F2 at the current time is less than or equal to the seventh set value F7, and determine the absolute value of the difference between the outdoor ambient temperature TAI1 before the seventh preset time t7 and the outdoor ambient temperature TAI2 at the current time Whether △TAI is less than the eighth set value T8;

It should be noted that, in the case of refrigeration, among all the above parameters of the air conditioner itself (namely, the discharge temperature TD of the compressor, the coil temperature TM of the indoor unit and the operating frequency F of the compressor), except for the previous time In addition to calculating the difference between the operating frequency of the compressor at the current time and the coil temperature of the indoor unit, the difference between the discharge temperature TD2 of the compressor at the current time and the coil temperature TC2 of the outdoor unit at the current time is also designed The comparison and judgment between TD2-TC2 and the fifth set value T5, so as to avoid misjudgment caused by the abnormal operation of the compressor itself and the inaccurate detection of the coil temperature sensor of the indoor unit and the coil temperature sensor of the outdoor unit. In some cases, abnormalities may occur in the compressor itself, resulting in deviations in the operation frequency of the compressor at the previous time and the current time, and the detection of the coil temperature of the indoor unit and the coil temperature of the outdoor unit may also be detected abnormally due to their own reasons, but On this basis, the probability of satisfying the comparison conditions of TD2-TC2 and T5 is basically zero. The present invention can eliminate the misjudgment of refrigerant leakage in the cooling situation of the air conditioner to the greatest extent through the above-mentioned logic design, and ensure that the air conditioner The detection accuracy of refrigerant leakage.

In a specific situation, if it is determined that the difference between the discharge temperature TD2 of the compressor at the current time and the coil temperature TC2 of the outdoor unit at the current time TD2-TC2 is greater than or equal to the fifth set value T5, and it is determined that the indoor The difference ΔTM between the coil temperature TM1 before the fifth preset time t5 of the indoor unit and the coil temperature TM2 of the indoor unit at the current time is greater than or equal to the sixth set value T6, and the sixth preset time of the compressor is determined The difference ΔF between the operating frequency F1 before t6 and the operating frequency F2 of the compressor at the current time is less than or equal to the seventh set value F7, and it is determined that the outdoor ambient temperature TAI1 before the seventh preset time t7 is different from the outdoor temperature at the current time. If the absolute value of the difference ΔTAI of the ambient temperature TAI2 is smaller than the eighth set value T8, it is determined that the air conditioner has refrigerant leakage.

Further preferably, a time limit can also be added to the aforementioned conditions of TD2-TC2≥T5, ΔTM≥T6, ΔF≤F7 and ΔTAI<T8, that is, the air conditioner can only be judged if the above conditions are met within the time limit. Refrigerant leakage of the air conditioner, thereby further improving the accuracy of detection. After testing by the inventor, under this condition, the possibility of misjudgment of the air conditioner is basically zero. That is, if within the eighth preset time t8, if it is determined that the difference between the discharge temperature TD2 of the compressor at the current time and the coil temperature TC2 of the outdoor unit at the current time TD2-TC2 is greater than or equal to the fifth set value T5 , and it is determined that the difference ΔTM between the coil temperature TM1 of the indoor unit before the fifth preset time t5 and the coil temperature TM2 of the indoor unit at the current time is greater than or equal to the sixth set value T6, and it is determined that the compressor’s first The difference ΔF between the operating frequency F1 before the sixth preset time t6 and the operating frequency F2 of the compressor at the current time is less than or equal to the seventh set value F7, and it is determined that the outdoor ambient temperature TAI1 before the seventh preset time t7 and Only when the absolute value of the difference ΔTAI of the outdoor ambient temperature TAI2 at the current time is less than the eighth set value T8 is it determined that the air conditioner has refrigerant leakage.

Further, in the above, if TD2-TC2<T5, ΔTM<T6, ΔF>F7 or ΔTAI≥T8, it is determined that no refrigerant leakage occurs in the air conditioner.

Those skilled in the art can flexibly set the first preset time t1, the second preset time t2, the third preset time t3, the fourth preset time t4, the fifth preset time t5, the sixth preset time Preset time t6, seventh preset time t7, eighth preset time t8, first set value T1, second set value T2, third set value F3, fourth set value T4, fifth set value The specific values of fixed value T5, sixth set value T6, seventh set value F7 and eighth set value T8. For example: the first preset time t1 and the fourth preset time t4 are both 10 minutes, the second preset time t2 and the third preset time t3 are both 5 minutes, the fifth preset time t5 and the eighth preset time t8 is 10 minutes, the sixth preset time t6 and the seventh preset time t7 are both 5 minutes, the first set value T1 is 50 degrees Celsius, the second set value T2 is -5 degrees Celsius, and the third set value F3 is 5HZ, the fourth setting value T4 is 2 degrees Celsius, the fifth setting value T5 is 40 degrees Celsius, the sixth setting value T6 is 5 degrees Celsius, the seventh setting value F7 is 5HZ, and the eighth setting value T8 is 2 degrees Celsius.

Preferably, after the step of "selectively adjusting the operating frequency of the compressor according to the discharge temperature of the compressor", the refrigerant leakage detection and control method of the present invention further includes:

The operating frequency of the compressor is selectively adjusted according to the discharge temperature of the compressor every set time.

In the above, take the set time as 20 minutes as an example. When the air conditioner leaks refrigerant, first reduce the frequency of the compressor, and then selectively adjust the compression every 20 minutes according to the real-time detected discharge temperature of the compressor. machine operating frequency.

Further, the step of "selectively adjusting the operating frequency of the compressor according to the discharge temperature of the compressor" includes: in the case of heating operation of the air conditioner, comparing the discharge temperature of the compressor with the first set temperature value Comparison; if the discharge temperature of the compressor is greater than the first set temperature value, the operating frequency of the compressor is increased; if the discharge temperature of the compressor is equal to the first set temperature value, the operating frequency of the compressor is kept constant change; if the discharge temperature of the compressor is lower than the first set temperature value, the operating frequency of the compressor is reduced.

In the above, those skilled in the art can flexibly set the specific value of the first set temperature value in practical applications, for example, set the first set temperature value to 60 degrees Celsius. More preferably, by calculating the difference x degrees Celsius between the current discharge temperature of the compressor and the first set temperature value, and then increasing the operating frequency of the compressor by xHZ, for example, if the current discharge temperature of the compressor is 65 degrees Celsius , then x=5, increase the operating frequency of the compressor by 5HZ, if the current discharge temperature of the compressor is 55 degrees Celsius, then x=-5, increase the operating frequency of the compressor by -5HZ (that is, reduce it by 5HZ) , if the current discharge temperature of the compressor is 60 degrees Celsius, the operating frequency of the compressor remains unchanged.

Further, the step of "selectively adjusting the operating frequency of the compressor according to the discharge temperature of the compressor" includes: comparing the discharge temperature of the compressor with the second set temperature value when the air conditioner is in cooling operation ; If the discharge temperature of the compressor is greater than the second set temperature value, the operating frequency of the compressor is increased; if the discharge temperature of the compressor is equal to the second set temperature value, the operating frequency of the compressor remains unchanged ; If the discharge temperature of the compressor is lower than the second set temperature value, the operating frequency of the compressor is reduced.

In the above, those skilled in the art can flexibly set the specific value of the second set temperature value in practical applications, for example, set the second set temperature value to 70 degrees Celsius. More preferably, by calculating the difference x degrees Celsius between the current discharge temperature of the compressor and the second set temperature value, and then increasing the operating frequency of the compressor by xHZ, for example, if the current discharge temperature of the compressor is 75 degrees Celsius , then x=5, increase the operating frequency of the compressor by 5HZ, if the current discharge temperature of the compressor is 65 degrees Celsius, then x=-5, increase the operating frequency of the compressor by -5HZ (that is, reduce it by 5HZ) , if the current discharge temperature of the compressor is 70 degrees Celsius, the operating frequency of the compressor remains unchanged.

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

Claims

A refrigerant leakage detection and control method for an air conditioner, characterized in that the refrigerant leakage detection and control method includes:

During the operation of the air conditioner, the exhaust temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor and the outdoor ambient temperature are obtained in real time;

According to the exhaust temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor and the outdoor ambient temperature, determine whether the air conditioner has refrigerant leakage;

In the case of refrigerant leakage of the air conditioner, the frequency of the compressor is reduced and the operating frequency of the compressor is selectively adjusted according to the discharge temperature of the compressor after a set time.
The refrigerant leakage detection and control method according to claim 1, characterized in that, "according to the discharge temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor and the outdoor ambient temperature , the step of determining whether the air conditioner has refrigerant leakage" specifically includes:

When the air conditioner is in heating operation, determine whether the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than or equal to the first set value, and determine Whether the difference between the coil temperature of the indoor unit before the first preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second set value is determined to determine the second preset value of the compressor. Whether the difference between the operating frequency before the time and the operating frequency of the compressor at the current time is less than or equal to the third set value, and determine the difference between the outdoor ambient temperature before the third preset time and the outdoor ambient temperature at the current time Whether the absolute value of is less than the fourth set value;

According to the judgment result, it is judged whether the air conditioner has refrigerant leakage.
The refrigerant leakage detection and control method according to claim 2, characterized in that, "judging whether the air conditioner has refrigerant leakage according to the judgment result" specifically includes:

If it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than or equal to the first set value, and it is determined that the first set value of the indoor unit is The difference between the coil temperature before the preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second set value, and it is determined that the temperature of the compressor before the second preset time is The difference between the operating frequency and the operating frequency of the compressor at the current time is less than or equal to the third set value, and the difference between the outdoor ambient temperature before the third preset time and the outdoor ambient temperature at the current time is determined If the absolute value of the value is smaller than the fourth set value, it is determined that the air conditioner has refrigerant leakage.
The refrigerant leakage detection and control method according to claim 3, wherein, "if it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than or equal to the The first set value, and determine that the difference between the coil temperature of the indoor unit before the first preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second setting value, and it is determined that the difference between the operating frequency of the compressor before the second preset time and the operating frequency of the compressor at the current time is less than or equal to the third set value, and it is determined that the first If the absolute value of the difference between the outdoor ambient temperature before three preset times and the outdoor ambient temperature at the current time is less than the fourth set value, then the step of determining that the air conditioner has refrigerant leakage" specifically includes:

If within the fourth preset time, it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the indoor unit at the current time is greater than or equal to the first set value, and it is determined that the The difference between the coil temperature of the indoor unit before the first preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the second set value, and it is determined that the compressor The difference between the operating frequency before the second preset time and the operating frequency of the compressor at the current time is less than or equal to the third set value, and it is determined that the outdoor ambient temperature before the third preset time is different from the If the absolute value of the difference of the outdoor ambient temperature at the current time is smaller than the fourth set value, it is determined that the air conditioner has refrigerant leakage.
The refrigerant leakage detection and control method according to claim 1, characterized in that, "according to the discharge temperature of the compressor, the coil temperature of the indoor unit, the operating frequency of the compressor and the outdoor ambient temperature , the step of determining whether the air conditioner has refrigerant leakage" specifically includes:

In the case of the cooling operation of the air conditioner, further obtain the coil temperature of the outdoor unit;

judging whether the difference between the discharge temperature of the compressor at the current time and the coil temperature of the outdoor unit at the current time is greater than or equal to the fifth set value, and judging the temperature of the indoor unit before the fifth preset time Whether the difference between the coil temperature and the coil temperature of the indoor unit at the current time is greater than or equal to the sixth set value, and determine whether the operating frequency of the compressor before the sixth preset time is different from the current time of the compressor. Whether the difference between the operating frequency of the time is less than or equal to the seventh set value, and determine whether the absolute value of the difference between the outdoor ambient temperature before the seventh preset time and the outdoor ambient temperature at the current time is less than the eighth set value;

According to the judgment result, it is judged whether the air conditioner has refrigerant leakage.
The refrigerant leakage detection and control method according to claim 5, wherein the step of "judging whether the air conditioner has refrigerant leakage according to the judgment result" specifically includes:

If it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the outdoor unit at the current time is greater than or equal to the fifth set value, and it is determined that the fifth set value of the indoor unit is The difference between the coil temperature before the preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the sixth set value, and it is determined that the temperature of the compressor before the sixth preset time is The difference between the operating frequency and the operating frequency of the compressor at the current time is less than or equal to the seventh set value, and the difference between the outdoor ambient temperature before the seventh preset time and the outdoor ambient temperature at the current time is determined If the absolute value of the value is smaller than the eighth set value, it is determined that the air conditioner has refrigerant leakage.
The refrigerant leakage detection and control method according to claim 6, wherein, "if it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the outdoor unit at the current time is greater than or equal to the The fifth set value, and determine that the difference between the coil temperature of the indoor unit before the fifth preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the sixth setting value, and it is determined that the difference between the operating frequency of the compressor before the sixth preset time and the operating frequency of the compressor at the current time is less than or equal to the seventh set value, and it is determined that the first If the absolute value of the difference between the outdoor ambient temperature before the seven preset time and the outdoor ambient temperature at the current time is less than the eighth set value, then the step of determining that the air conditioner has refrigerant leakage" specifically includes:

If within the eighth preset time, it is determined that the difference between the discharge temperature of the compressor at the current time and the coil temperature of the outdoor unit at the current time is greater than or equal to the fifth set value, and it is determined that the The difference between the coil temperature of the indoor unit before the fifth preset time and the coil temperature of the indoor unit at the current time is greater than or equal to the sixth set value, and it is determined that the compressor The difference between the operating frequency before the sixth preset time and the operating frequency of the compressor at the current time is less than or equal to the seventh set value, and it is determined that the outdoor ambient temperature before the seventh preset time is If the absolute value of the difference of the outdoor ambient temperature at the current time is smaller than the eighth set value, it is determined that the air conditioner has refrigerant leakage.
The refrigerant leakage detection and control method according to any one of claims 1 to 7, characterized in that after the step of "selectively adjusting the operating frequency of the compressor according to the discharge temperature of the compressor", the The refrigerant leakage detection and control method also includes:

The operating frequency of the compressor is selectively adjusted according to the discharge temperature of the compressor every said set time.
The refrigerant leakage detection and control method according to claim 8, wherein the step of "selectively adjusting the operating frequency of the compressor according to the discharge temperature of the compressor" comprises:

In the case of the heating operation of the air conditioner, comparing the discharge temperature of the compressor with a first set temperature value;

If the discharge temperature of the compressor is greater than the first set temperature value, increasing the operating frequency of the compressor;

If the discharge temperature of the compressor is equal to the first set temperature value, keep the operating frequency of the compressor unchanged;

If the discharge temperature of the compressor is lower than the first set temperature value, the operating frequency of the compressor is reduced.
The refrigerant leakage detection and control method according to claim 8, wherein the step of "selectively adjusting the operating frequency of the compressor according to the discharge temperature of the compressor" comprises:

In the case of the cooling operation of the air conditioner, comparing the discharge temperature of the compressor with a second set temperature value;

If the discharge temperature of the compressor is greater than the second set temperature value, increasing the operating frequency of the compressor;

If the discharge temperature of the compressor is equal to the second set temperature value, keep the operating frequency of the compressor unchanged;

If the discharge temperature of the compressor is lower than the second set temperature value, the operating frequency of the compressor is reduced.