A refrigerant leakage detection control method of an air conditioner

Abstract

The application provides a refrigerant leakage detection control method of an air conditioner, which comprises the following steps: obtaining an air conditioner state of the air conditioner after the air conditioner is powered on; collecting refrigerant concentrations at multiple time points to obtain a refrigerant data set, wherein the refrigerant data set comprises multiple refrigerant concentrations; obtaining a refrigerant condition and a refrigerant detection concentration of the air conditioner according to the refrigerant data set; controlling the air conditioner to perform a processing action to reduce a refrigerant concentration of an environment in which the air conditioner is located according to the air conditioner state, the refrigerant data set, the refrigerant condition and the refrigerant detection concentration; wherein the air conditioner state comprises a running state and a standby state; and the refrigerant condition comprises that the air conditioner has refrigerant leakage or the air conditioner has no refrigerant leakage. The application solves the technical problem that the prior art does not propose a refrigerant leakage detection control method in different application scenarios, so that the refrigerant concentration cannot be quickly responded in different air conditioner states.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and more specifically, to a method for detecting and controlling refrigerant leakage in air conditioners. Background Technology

[0002] Air conditioners, as devices for regulating indoor temperature, have been widely used. During the use of air conditioners, refrigerant leakage may occur, affecting the cooling / heating effect of the air conditioner. In severe cases, it may even burn out the equipment and cause disasters such as explosions.

[0003] With the upgrading of environmental regulations regarding refrigerant requirements for refrigeration equipment, the integration of refrigerant leak detection functions into air conditioners has gradually become a priority. The aim is to promptly detect, identify, and alert users when a refrigerant leak occurs. The typical approach to handling refrigerant leaks in the market is as follows: the refrigerant sensor detects that the refrigerant concentration exceeds a threshold, returns an alarm signal to the main controller, and the main controller then controls the load to perform operations to disperse and dilute the refrigerant (such as shutting down the compressor and increasing the fan speed).

[0004] However, in actual use, there is a problem: the existing technology does not propose a method for detecting and controlling refrigerant leakage in different application scenarios, so it is impossible to respond quickly to the refrigerant concentration under different air conditioning conditions. Summary of the Invention

[0005] This invention addresses the technical problem that existing technologies do not offer methods for detecting and controlling refrigerant leakage in different application scenarios, thus failing to provide rapid responses to refrigerant concentrations under varying air conditioning conditions.

[0006] To address the aforementioned problems, this invention provides a refrigerant leakage detection and control method for an air conditioner. The method includes: acquiring the air conditioner's status after the air conditioner is powered on; collecting refrigerant concentrations at multiple times to obtain a refrigerant dataset, wherein the refrigerant dataset includes multiple refrigerant concentrations; obtaining the air conditioner's refrigerant status and refrigerant detection concentration based on the refrigerant dataset; and controlling the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located, based on the air conditioner status, the refrigerant dataset, the refrigerant status, and the refrigerant detection concentration. The air conditioner status includes an operating state and a standby state; the refrigerant status includes whether the air conditioner has experienced a refrigerant leak or not.

[0007] Compared with existing technologies, the technical effects achieved by this solution are as follows: This invention proposes a software algorithm control method for refrigerant leakage in two states of air conditioning (operating state and standby state), and differentiated control is more suitable for application scenarios. Specifically, based on the refrigerant concentration values ​​at multiple moments in the refrigerant dataset, it can determine whether the air conditioner has experienced a refrigerant leak and obtain the detected refrigerant concentration. Finally, based on the air conditioner status, refrigerant dataset, refrigerant condition, and detected refrigerant concentration, it determines which leakage stage the air conditioner is in and controls the air conditioner to perform corresponding processing actions, thereby dispersing the refrigerant and reducing the refrigerant concentration in the environment where the air conditioner is located, achieving rapid response and efficient removal of high-concentration refrigerant.

[0008] In one embodiment of the present invention, the air conditioner is controlled to perform a processing action to reduce the refrigerant concentration in the environment in which the air conditioner is located, based on the air conditioner status, refrigerant data set, refrigerant condition, and refrigerant detection concentration. This includes: when the air conditioner is in operation, determining whether the refrigerant condition indicates a refrigerant leak in the air conditioner; when it is determined that the refrigerant condition indicates a refrigerant leak in the air conditioner, obtaining the refrigerant concentration change rate based on the refrigerant data set; and controlling the air conditioner to perform a processing action based on the refrigerant concentration change rate and the refrigerant detection concentration.

[0009] Compared with existing technologies, the technical effects achieved by this solution are: by combining real-time collected refrigerant concentration and refrigerant concentration change rate, the air conditioner can be controlled to perform different processing actions, thereby improving the accuracy of refrigerant concentration detection.

[0010] In one embodiment of the present invention, the processing actions include: a first action, a second action, a third action, and a fourth action; controlling the air conditioner to perform processing actions based on the refrigerant concentration change rate and the refrigerant detection concentration includes: obtaining a detection concentration difference based on the refrigerant detection concentration and a detection concentration threshold, wherein the detection concentration difference = The refrigerant concentration change rate is compared with the first concentration change rate threshold and the second concentration change rate threshold. If the refrigerant concentration change rate is greater than the first concentration change rate threshold, the air conditioner is controlled to perform a processing action based on the detected refrigerant concentration. If the refrigerant concentration change rate is less than the second concentration change rate threshold, the air conditioner is controlled to perform a processing action based on the detected refrigerant concentration. Wherein, the first concentration change rate threshold is greater than the second concentration change rate threshold.

[0011] Compared to existing technologies, this technical solution achieves the following advantages: It uses the absolute value of the difference between the detection concentration threshold and the refrigerant detection concentration to represent the detection concentration difference, ensuring that the value of the detection concentration difference is always greater than or equal to 0. This facilitates subsequent judgment of the refrigerant leakage stage based on the detection concentration difference. It prioritizes judging the refrigerant concentration change rate; only when the refrigerant concentration change rate exceeds the first concentration change rate threshold is the leakage stage determined based on the detection concentration difference. This simplifies the judgment criteria and improves detection efficiency.

[0012] In one embodiment of the present invention, when the refrigerant concentration change rate is greater than a first concentration change rate threshold, the air conditioner is controlled to perform a processing action based on the magnitude of the detected refrigerant concentration, including: comparing the detected concentration difference with the magnitudes of a first difference threshold, a second difference threshold, a third difference threshold, and a fourth difference threshold; controlling the air conditioner to perform a first action when the third difference threshold ≤ the detected concentration difference ≤ the fourth difference threshold; and / or controlling the air conditioner to perform a second action when the second difference threshold ≤ the detected concentration difference < the third difference threshold; and / or controlling the air conditioner to perform a second action when the first difference threshold ≤ the detected concentration difference < the third difference threshold; and / or controlling the air conditioner to perform a second action when the first difference threshold ≤ the detected concentration difference < the third difference threshold. When the concentration difference is less than the second difference threshold, the air conditioner is controlled to perform a third action; wherein, the first concentration change rate threshold is greater than the second concentration change rate threshold; the first difference threshold is less than the second difference threshold, the third difference threshold is less than the fourth difference threshold; the first action includes: increasing the indoor fan speed and shutting off the compressor and the outdoor fan; the second action includes: adjusting the indoor fan speed to the maximum, shutting off the compressor and the outdoor fan, and controlling the alarm unit to issue an alarm signal; the third action includes: adjusting the indoor fan speed to the maximum, shutting off the compressor and the outdoor fan, swinging the air guide plate, and controlling the alarm unit to issue an alarm signal.

[0013] Compared with existing technologies, the technical effects achieved by this solution are as follows: When the refrigerant concentration change rate is greater than the first concentration change rate threshold: when the third difference threshold ≤ the detected concentration difference ≤ the fourth difference threshold, the sensor identifies the refrigerant leak as an initial stage, with a high leakage rate and a low refrigerant concentration, and the air conditioner performs the first action to disperse the refrigerant; when the second difference threshold ≤ the detected concentration difference < the third difference threshold, the sensor identifies the refrigerant leak as a mid-stage, with a high leakage rate and a high refrigerant concentration, and the air conditioner performs the second action to disperse the refrigerant and sounds an alarm to alert the user; when the first difference threshold ≤ the detected concentration difference < the second difference threshold, the sensor identifies the refrigerant leak as a late stage, with a high leakage rate and the refrigerant concentration approaching the alarm point, and the air conditioner performs the third action to disperse the refrigerant and sounds an alarm to alert the user, while simultaneously activating the air sweep function to swing the air guide vane to accelerate the refrigerant dispersion. This invention controls the air conditioner to perform processing actions based on the leakage stage of the refrigerant leak. The later the leakage stage, the more complex the processing actions, further improving the ability and rate of refrigerant dispersion.

[0014] In one embodiment of the present invention, when the refrigerant concentration change rate is less than a second concentration change rate threshold, the air conditioner is controlled to perform a processing action based on the magnitude of the detected refrigerant concentration, including: comparing the detected concentration difference with the magnitude of a fifth difference threshold; when the detected concentration difference is ≥ the fifth difference threshold, the air conditioner is controlled to perform a fourth action; wherein, the fourth action includes: controlling the indoor fan to run at low speed for a fourth set time and then turning off the indoor fan.

[0015] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: when the refrigerant concentration change rate is less than the second concentration change rate threshold, and the detected concentration difference is greater than or equal to the fifth difference threshold, the sensor identifies the refrigerant leak as being in its final stage, with a low leakage rate, low refrigerant detection concentration, and the refrigerant having been exhausted or emptied. The air conditioner then performs the fourth action.

[0016] In one embodiment of the present invention, when the refrigerant concentration change rate is greater than a first concentration change rate threshold, after controlling the air conditioner to perform a processing action based on the refrigerant detection concentration, the refrigerant leakage detection control method further includes: cyclically executing, based on the air conditioner status, refrigerant dataset, refrigerant condition and refrigerant detection concentration, controlling the air conditioner to perform a processing action to reduce the refrigerant concentration in the environment where the air conditioner is located.

[0017] Compared with existing technologies, the technical effect achieved by adopting this technical solution is: to continuously detect the refrigerant concentration.

[0018] In one embodiment of the present invention, when it is determined that the refrigerant situation is that the air conditioner is leaking refrigerant, the refrigerant concentration change rate is obtained based on the refrigerant dataset, including: obtaining multiple concentration change rates based on multiple refrigerant concentrations, wherein the concentration change rate = (refrigerant concentration at the next moment - refrigerant concentration at the previous moment) / first interval duration; obtaining the refrigerant concentration change rate based on multiple concentration change rates; wherein the refrigerant concentration change rate is the maximum value among the multiple concentration change rates.

[0019] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: the maximum value among multiple concentration change rates is defined as the refrigerant concentration change rate, thereby improving the rigor of the refrigerant leakage detection and control method.

[0020] In one embodiment of the present invention, the processing action further includes a fifth action; based on the air conditioner status, refrigerant data set, refrigerant condition, and refrigerant detection concentration, controlling the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located, and further including: when the air conditioner is in standby mode, determining whether the refrigerant condition indicates a refrigerant leak in the air conditioner; when it is determined that the refrigerant condition indicates a refrigerant leak in the air conditioner, controlling the air conditioner to perform the fifth action; wherein the fifth action includes: adjusting the indoor fan speed to the maximum and controlling the alarm unit to issue an alarm signal.

[0021] Compared to existing technologies, the technical effect achieved by this solution is as follows: In standby mode, if multiple refrigerant concentration values ​​gradually increase over time, it indicates that a refrigerant leak has occurred in the air conditioner. Therefore, the air conditioner executes the fifth action, specifically: the CPU controls the load: the indoor fan operates at its highest speed while simultaneously issuing an alarm signal.

[0022] In one embodiment of the present invention, obtaining the refrigerant status and refrigerant detection concentration of an air conditioner based on a refrigerant dataset includes: determining the refrigerant status based on multiple refrigerant concentrations at multiple times; when the air conditioner is in operation, acquiring multiple refrigerant concentrations within a first set time period; when the multiple refrigerant concentrations gradually increase within the first set time period, determining that the air conditioner is leaking refrigerant; determining the last refrigerant concentration among the multiple refrigerant concentrations within the first set time period as the refrigerant detection concentration; and / or when the air conditioner is in standby mode, acquiring multiple refrigerant concentrations within a second set time period; when the multiple refrigerant concentrations gradually increase within the second set time period, determining that the air conditioner is leaking refrigerant; wherein the first set time period < the second set time period.

[0023] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: The first set time is less than the second set time. This is because refrigerant leakage when the air conditioner is running poses a greater risk to users than refrigerant leakage when the air conditioner is in standby mode. Therefore, the frequency of judging the refrigerant condition needs to be higher, thereby improving the detection accuracy of refrigerant leakage when running.

[0024] In one embodiment of the present invention, after the air conditioner is powered on and its air conditioning status is obtained, the method further includes: periodically collecting refrigerant concentrations at multiple times to obtain a refrigerant dataset; cyclically executing the process of obtaining the refrigerant status and refrigerant detection concentration of the air conditioner based on the refrigerant dataset; and cyclically executing the process of controlling the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located based on the air conditioning status, refrigerant dataset, refrigerant status, and refrigerant detection concentration.

[0025] Compared with existing technologies, the technical effects achieved by adopting this technical solution are: it can continuously collect and update refrigerant concentration, and further continuously update refrigerant data values, refrigerant status, refrigerant detection concentration, and refrigerant concentration change rate, etc., and control the processing actions of the air conditioner in real time to ensure the real-time nature of judgment results and processing actions, thereby improving the control efficiency and accuracy of the air conditioner.

[0026] By adopting the technical solution of the present invention, the following technical effects can be achieved:

[0027] (1) This invention proposes a software algorithm control method for refrigerant leakage in two states of air conditioner (running state and standby state), and the differentiated control is more in line with the application scenario;

[0028] (2) Based on the air conditioner status, refrigerant data set, refrigerant condition and refrigerant detection concentration, determine which leakage stage the air conditioner is in, and control the air conditioner to perform corresponding processing actions, thereby dispersing the refrigerant and reducing the refrigerant concentration in the environment where the air conditioner is located, so as to achieve rapid response and efficient removal of high-concentration refrigerant.

[0029] (3) It can continuously collect and update the refrigerant concentration, and further continuously update the refrigerant data value, refrigerant status, refrigerant detection concentration and refrigerant concentration change rate, etc., and control the processing action of the air conditioner in real time to ensure the real-time nature of the judgment result and processing action, and improve the control efficiency and control accuracy of the air conditioner. Attached Figure Description

[0030] Figure 1 This is a flowchart of a refrigerant leakage detection and control method for an air conditioner provided in Embodiment 1 of the present invention;

[0031] Figure 2 for Figure 1 A detailed flowchart of the refrigerant leakage detection and control method for central air conditioning units. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] See Figure 1 This invention provides a refrigerant leakage detection and control method for air conditioners, combined with Figure 2 Refrigerant leakage detection and control methods include:

[0035] Step S100: After the air conditioner is powered on, obtain the air conditioning status of the air conditioner;

[0036] Step S200: Collect refrigerant concentrations at multiple times to obtain a refrigerant dataset, wherein the refrigerant dataset includes: multiple refrigerant concentrations;

[0037] Step S300: Obtain the refrigerant status and refrigerant detection concentration of the air conditioner based on the refrigerant dataset;

[0038] Step S400: Based on the air conditioner status, refrigerant data set, refrigerant condition, and refrigerant detection concentration, control the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located;

[0039] The air conditioner status includes: operating status and standby status; the refrigerant status includes: the air conditioner has a refrigerant leak and the air conditioner has no refrigerant leak.

[0040] In one specific embodiment, the air conditioner states include: operating state and standby state. This invention proposes a software algorithm control method for refrigerant leakage in the two states of the air conditioner (operating state and standby state), and the differentiated control is more in line with the application scenario.

[0041] Specifically, the process of collecting refrigerant concentrations at multiple moments to obtain a refrigerant dataset is as follows: A refrigerant concentration is collected at each first interval. A refrigerant dataset is obtained from the collection of multiple refrigerant concentrations, with each dataset containing multiple refrigerant concentrations. Based on the refrigerant concentration values ​​at multiple moments within the dataset, it can be determined whether the air conditioner is leaking refrigerant, and the refrigerant detection concentration can be obtained. Finally, based on the air conditioner status, the refrigerant dataset, the refrigerant condition, and the refrigerant detection concentration, the leakage stage of the air conditioner is determined, and the air conditioner is controlled to perform corresponding actions to disperse the refrigerant and reduce the refrigerant concentration in the environment, achieving rapid response and efficient removal of high-concentration refrigerant.

[0042] Furthermore, step S400 includes:

[0043] Step S410: If the air conditioner is in operation, determine whether the refrigerant is leaking.

[0044] Step S411: When it is determined that the air conditioner is leaking refrigerant, obtain the refrigerant concentration change rate based on the refrigerant dataset;

[0045] Step S412: Based on the refrigerant concentration change rate and the detected refrigerant concentration, control the air conditioner to perform processing actions.

[0046] Furthermore, step S411 includes:

[0047] Multiple concentration change rates are obtained based on multiple refrigerant concentrations, where the concentration change rate = (refrigerant concentration at the next moment - refrigerant concentration at the previous moment) / first interval duration;

[0048] The refrigerant concentration change rate is obtained based on multiple concentration change rates;

[0049] Among them, the refrigerant concentration change rate is the maximum value among multiple concentration change rates.

[0050] In one specific embodiment, if the air conditioner is in operation, the program algorithm controls the main chip to access dedicated storage space to store the refrigerant concentration collected by the indoor unit's refrigerant sensor, thereby constructing a refrigerant dataset. Based on multiple refrigerant concentrations, it can determine whether the air conditioner has experienced a refrigerant leak. The condition for determining that the air conditioner has experienced a refrigerant leak is that, within a refrigerant dataset, the refrigerant concentration gradually increases according to the time sequence. When it is determined that the air conditioner has experienced a refrigerant leak, the rate of change of refrigerant concentration can be calculated based on the multiple refrigerant concentrations in the refrigerant dataset.

[0051] Specifically, during operation, every Collect a refrigerant concentration value, that is, in continuous... Time can be obtained A refrigerant concentration value, at this time a refrigerant dataset includes The refrigerant concentration value is expressed in %LFL; for example... The value is 1 second. The value is 3s. The value of is 3, where This is the duration of the first interval. Set the duration as the first option. This refers to the number of refrigerant concentration values ​​collected in the refrigerant data set. Specifically, it involves collecting one refrigerant concentration value every 1 second, obtaining three refrigerant concentration values ​​(C1, C2, and C3) over three consecutive seconds, and then calculating... The concentration change rates of the refrigerant dataset within the time period were respectively and , , , The maximum value among multiple concentration change rates is defined as the refrigerant concentration change rate, thus increasing the stringency of refrigerant leak detection (or refrigerant stage assessment). Here, C1 represents the refrigerant concentration value at the first moment, indicating that at... C1 is the refrigerant concentration value at time 1 second; C2 is the refrigerant concentration value at time 2, which means that at time 3, C4 is the refrigerant concentration value at time 4, C5 is the refrigerant concentration value at time 5, C6 is the refrigerant concentration value at time 6, C7 is the refrigerant concentration value at time 7, C8 is the refrigerant concentration value at time 8, C9 is the refrigerant concentration value at time C2 is the refrigerant concentration value at the 2nd second within the time period; C3 is the refrigerant concentration value at the third second, which indicates that at... The refrigerant concentration value at the 3rd second within the time period; The refrigerant concentration change rate is used as one of the conditions for controlling the air conditioner to perform processing actions, enabling the air conditioner to perform processing actions more quickly and efficiently reduce the refrigerant concentration.

[0052] In a refrigerant dataset, if C1 < C2 < C3, it indicates that the air conditioner is leaking refrigerant during operation.

[0053] Furthermore, the processing actions include: the first action, the second action, the third action, and the fourth action;

[0054] Based on the refrigerant concentration change rate and the detected refrigerant concentration, the air conditioner is controlled to perform the following actions:

[0055] Based on the refrigerant detection concentration and the detection concentration threshold, the detection concentration difference is obtained, where the detection concentration difference = ;

[0056] The refrigerant concentration change rate is compared with the first concentration change rate threshold and the second concentration change rate threshold;

[0057] If the refrigerant concentration change rate is greater than the first concentration change rate threshold, the air conditioner will be controlled to perform processing actions based on the detected refrigerant concentration.

[0058] If the refrigerant concentration change rate is less than the second concentration change rate threshold, the air conditioner is controlled to perform processing actions based on the detected refrigerant concentration.

[0059] Among them, the first concentration change rate threshold is greater than the second concentration change rate threshold.

[0060] Specifically, if the air conditioner is running, the refrigerant leakage stage can be determined by the refrigerant concentration change rate and the detected concentration difference, thereby controlling the handling action. ,in, To detect the concentration difference, To detect the concentration threshold, This is for refrigerant concentration detection. (Through...) and The absolute value of the difference between them is used to represent ,ensure The value is always greater than or equal to 0, making it easier to determine the stage of refrigerant leakage by detecting the concentration difference. Prioritize judging the rate of change of refrigerant concentration. Based on this, and then according to To determine the leakage stage, simplify the judgment criteria and improve detection efficiency. Among these, The first concentration change rate threshold, This is the second concentration change rate threshold.

[0061] For example, The preferred value is 25% LFL. The preferred value is 8.3% LFL / s. The preferred value is . Based on the characterization, the time requirement from the onset of refrigerant leakage to triggering the alarm threshold (i.e., the detection concentration threshold) is generally less than 30 seconds, and the detection concentration threshold is generally selected as 25% LFL. .

[0062] Furthermore, when the refrigerant concentration change rate exceeds the first concentration change rate threshold, the air conditioner is controlled to perform processing actions based on the detected refrigerant concentration, including:

[0063] Compare the detection concentration difference with the magnitudes of the first difference threshold, the second difference threshold, the third difference threshold, and the fourth difference threshold;

[0064] When the third difference threshold ≤ the detected concentration difference ≤ the fourth difference threshold, control the air conditioner to perform the first action; and / or

[0065] When the second difference threshold is less than or equal to the detected concentration difference and less than the third difference threshold, the air conditioner is controlled to perform the second action; and / or

[0066] When the first difference threshold is less than or equal to the detected concentration difference and less than the second difference threshold, the air conditioner is controlled to perform the third action;

[0067] The first difference threshold is less than the second difference threshold, the third difference threshold is less than the fourth difference threshold; the first action includes: increasing the speed of the internal fan, and turning off the compressor and the external fan; the second action includes: adjusting the speed of the internal fan to the maximum, turning off the compressor and the external fan, and controlling the alarm unit to issue an alarm signal; the third action includes: adjusting the speed of the internal fan to the maximum, turning off the compressor and the external fan, swinging the air guide plate, and controlling the alarm unit to issue an alarm signal.

[0068] Specifically, the controller CPU executes the algorithm to determine: when and When the sensor detects refrigerant leakage in its initial stage, with a high leakage rate and low refrigerant concentration, the air conditioner performs its first action to disperse the refrigerant; when and When the sensor identifies the refrigerant leak as being in the intermediate stage, with a high leakage rate and a high refrigerant concentration, the air conditioner performs a second action to disperse the refrigerant and issue an alarm to alert the user; when and When the sensor detects a refrigerant leak in its later stages, with a high leakage rate and refrigerant concentration approaching the alarm point, the air conditioner performs a third action to disperse the refrigerant and trigger an alarm to alert the user. Simultaneously, it activates the air sweeping function, oscillating the air deflector to accelerate refrigerant dispersion. This invention controls the air conditioner's actions based on the stage of the refrigerant leak; the later the leakage stage, the more complex the actions, further improving the ability and rate of refrigerant dispersion. The first difference threshold, The second difference threshold, The third difference threshold, The fourth difference threshold, Generally speaking, The smaller, The larger the refrigerant leak, the later the stage of refrigerant leakage.

[0069] Preferred, The preferred value is 0% LFL. The preferred value is 5% LFL. The preferred value is 15% LFL. The preferred value is 25% LFL.

[0070] Furthermore, when the refrigerant concentration change rate is less than the second concentration change rate threshold, the air conditioner is controlled to perform processing actions based on the detected refrigerant concentration, including:

[0071] Compare the concentration difference with the fifth difference threshold;

[0072] When the concentration difference is greater than or equal to the fifth difference threshold, the air conditioner is controlled to perform the fourth action;

[0073] The fourth action includes: controlling the internal fan to run at low speed for a set time and then turning off the internal fan.

[0074] Specifically, the controller CPU's algorithm judgment also includes: In the case of, when When the sensor identifies the refrigerant leak as being in its final stage, with a low leakage rate and low refrigerant concentration, indicating that the refrigerant has been exhausted or emptied, the air conditioner executes the fourth action. This fourth action includes: the controller CPU shutting down all other loads, operating only the indoor fan at low speed for a set duration, and then shutting down the indoor fan. After shutting down the indoor fan (i.e., after completing the fourth action), the power supply to both the indoor and outdoor units of the air conditioner is cut off, ending the process.

[0075] Preferred, The preferred value is 15% LFL, and the fourth setting is 1 minute.

[0076] Furthermore, when the refrigerant concentration change rate exceeds the first concentration change rate threshold, after controlling the air conditioner to perform processing actions based on the detected refrigerant concentration, the refrigerant leak detection and control method also includes:

[0077] The system continuously executes actions based on the air conditioner status, refrigerant data set, refrigerant condition, and refrigerant detection concentration, controlling the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located.

[0078] Specifically, after executing the action of controlling the air conditioner to perform processing actions based on the detected refrigerant concentration when the refrigerant concentration change rate exceeds the first concentration change rate threshold, that is, after the air conditioner performs the first (or second, or third) action to disperse the refrigerant, the process is repeated cyclically, based on the air conditioner status, refrigerant data set, refrigerant condition, and detected refrigerant concentration, to control the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located, until... and satisfy: and When the fourth action is completed, the power supply to the indoor and outdoor units of the air conditioner is cut off, and the process ends.

[0079] Furthermore, the processing actions also include a fifth action;

[0080] Step S400 also includes:

[0081] Step S420: When the air conditioner is in standby mode, determine whether the refrigerant is leaking.

[0082] Step S421: When it is determined that the air conditioner is leaking refrigerant, control the air conditioner to perform the fifth action;

[0083] The fifth action includes: adjusting the internal fan speed to the maximum and controlling the alarm unit to issue an alarm signal.

[0084] Specifically, if the air conditioner is in standby mode, the condition for determining that the air conditioner has a refrigerant leak is: in a refrigerant data set, the refrigerant concentration gradually increases according to the time sequence.

[0085] Specifically, in standby mode, every [time] Collect a refrigerant concentration value, that is, in continuous... Time can be obtained A refrigerant concentration value, at this time a refrigerant dataset includes The refrigerant concentration value is expressed in %LFL; for example... The value is 1 second. The value is 5s. The value of is 5, where Set the duration for the second time. This refers to the number of refrigerant concentration values ​​collected in the refrigerant data set. Specifically, one refrigerant concentration value is collected every 1 second, resulting in five values ​​over 5 seconds. If these five values ​​gradually increase over time, it indicates a refrigerant leak in the air conditioner during standby. Therefore, the air conditioner executes the fifth action: the CPU controls the load to operate the indoor fan at its highest speed while simultaneously issuing an alarm signal. Preferably, when executing the fifth action, the last value is obtained... If the refrigerant concentration decreases over time, turn off the indoor fan. After turning off the indoor fan, disconnect the power supply to both the indoor and outdoor units of the air conditioner to end the process.

[0086] If the air conditioner is in standby mode and the refrigerant status is determined to be normal, no action is taken on the air conditioner.

[0087] Furthermore, step S300 includes:

[0088] Step S310: Determine the refrigerant status based on multiple refrigerant concentrations at multiple times;

[0089] Step S320: When the air conditioner is in operation, obtain multiple refrigerant concentrations within a first set time period;

[0090] If the concentration of multiple refrigerants gradually increases within the first set time period, it is determined that the air conditioner is leaking refrigerant.

[0091] Within a first set time period, the last refrigerant concentration among multiple refrigerant concentrations is determined as the refrigerant detection concentration; and / or

[0092] Step S330: When the air conditioner is in standby mode, obtain multiple refrigerant concentrations within a second set time period;

[0093] If the concentration of multiple refrigerants gradually increases within the second set time period, it is determined that the air conditioner is leaking refrigerant.

[0094] Wherein, the first set duration is less than the second set duration.

[0095] Specifically, the first set duration is less than the second set duration because refrigerant leakage when the air conditioner is running poses a greater risk to users than refrigerant leakage when the air conditioner is in standby mode. Therefore, the frequency of refrigerant condition checks needs to be higher to improve the detection accuracy of refrigerant leaks during operation.

[0096] Additionally, when the air conditioner is running and a refrigerant leak is detected, the refrigerant detection concentration is defined as the last refrigerant concentration in a refrigerant data set, used to calculate the obtained... Based on the preceding content, =C3.

[0097] Furthermore, after step S100, the refrigerant leakage detection and control method also includes:

[0098] Refrigerant concentrations are periodically collected at multiple times to obtain a refrigerant dataset;

[0099] The loop executes to obtain the refrigerant status and refrigerant concentration of the air conditioner based on the refrigerant dataset.

[0100] The system continuously executes actions based on the air conditioner status, refrigerant data set, refrigerant condition, and refrigerant detection concentration, controlling the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located.

[0101] Specifically, the system periodically collects refrigerant concentration data at multiple points in time for the first cycle duration to obtain a refrigerant dataset. It then iteratively executes the process to determine the refrigerant status and detected concentration of the air conditioner based on this dataset. Finally, it iteratively executes the process based on the air conditioner status, the refrigerant dataset, the refrigerant status, and the detected concentration to control the air conditioner and perform actions to reduce the refrigerant concentration in the environment. This system continuously collects and updates refrigerant concentration data, and further continuously updates refrigerant data values, refrigerant status, detected concentration, and refrigerant concentration change rate, allowing for real-time control of the air conditioner's actions. This ensures the real-time nature of the judgment results and actions, improving the control efficiency and accuracy of the air conditioner. For example, the first cycle duration can be set to 3 seconds.

[0102] For example, in 1 After obtaining the first refrigerant dataset (which includes C1, C2, and C3), in 2 The second refrigerant dataset (which includes C4, C5, and C6) is obtained continuously, following the pattern: C1←C4, C2←C5, C3←C6, and so on (that is, the refrigerant concentration values ​​in the first refrigerant dataset are updated), so that the storage unit always retains three refrigerant concentration data C1, C2, and C3.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting and controlling refrigerant leakage in an air conditioner, characterized in that, The refrigerant leakage detection and control method includes: After the air conditioner is powered on, the air conditioning status of the air conditioner is obtained; Refrigerant concentrations at multiple times are collected to obtain a refrigerant dataset, wherein the refrigerant dataset includes: multiple refrigerant concentrations; The refrigerant status and refrigerant concentration of the air conditioner are obtained based on the refrigerant dataset. Based on the air conditioner status, the refrigerant data set, the refrigerant condition, and the refrigerant detection concentration, the air conditioner is controlled to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located; The air conditioner status includes: operating status and standby status; the refrigerant status includes: the air conditioner is leaking refrigerant, and the air conditioner is not leaking refrigerant. The step of obtaining the refrigerant status and refrigerant detection concentration of the air conditioner based on the refrigerant dataset includes: The refrigerant status is determined based on the refrigerant concentration at multiple times. When the air conditioner is in the operating state, multiple refrigerant concentrations are obtained within a first set time period; When the concentrations of multiple refrigerants gradually increase within the first set time period, it is determined that the air conditioner is leaking refrigerant. Within the first set time period, the last of the multiple refrigerant concentrations is determined as the refrigerant detection concentration; and / or When the air conditioner is in standby mode, multiple refrigerant concentrations are obtained within a second set time period; When the concentrations of multiple refrigerants gradually increase within the second set time period, it is determined that the air conditioner is leaking refrigerant. Wherein, the first set duration is less than the second set duration.

2. The refrigerant leakage detection and control method according to claim 1, characterized in that, The step of controlling the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located, based on the air conditioner status, the refrigerant data set, the refrigerant condition, and the refrigerant detection concentration, includes: When the air conditioner is in the operating state, determine whether the refrigerant situation indicates that the air conditioner is leaking refrigerant. When it is determined that the air conditioner is leaking refrigerant, the refrigerant concentration change rate is obtained based on the refrigerant dataset. Based on the refrigerant concentration change rate and the refrigerant detection concentration, the air conditioner is controlled to perform the processing action.

3. The refrigerant leakage detection and control method according to claim 2, characterized in that, The processing actions include: a first action, a second action, a third action, and a fourth action; The step of controlling the air conditioner to perform the processing action based on the refrigerant concentration change rate and the detected refrigerant concentration includes: Based on the refrigerant detection concentration and the detection concentration threshold, the detection concentration difference is obtained, wherein the detection concentration difference = ; The refrigerant concentration change rate is compared with the first concentration change rate threshold and the second concentration change rate threshold; If the refrigerant concentration change rate is greater than the first concentration change rate threshold, the air conditioner is controlled to perform the processing action according to the magnitude of the detected refrigerant concentration. If the refrigerant concentration change rate is less than the second concentration change rate threshold, the air conditioner is controlled to perform the processing action according to the magnitude of the detected refrigerant concentration. Wherein, the first concentration change rate threshold is greater than the second concentration change rate threshold.

4. The refrigerant leakage detection and control method according to claim 3, characterized in that, When the refrigerant concentration change rate is greater than the first concentration change rate threshold, the process of controlling the air conditioner to perform the processing action based on the detected refrigerant concentration includes: Compare the detected concentration difference with the magnitudes of the first difference threshold, the second difference threshold, the third difference threshold, and the fourth difference threshold; When the third difference threshold ≤ the detected concentration difference ≤ the fourth difference threshold, the air conditioner is controlled to perform the first action; and / or When the second difference threshold is less than or equal to the detected concentration difference and less than the third difference threshold, the air conditioner is controlled to perform the second action; and / or When the first difference threshold is less than or equal to the detected concentration difference and less than the second difference threshold, the air conditioner is controlled to perform the third action; Wherein, the first concentration change rate threshold is greater than the second concentration change rate threshold; the first difference threshold is less than the second difference threshold, less than the third difference threshold, and less than the fourth difference threshold; the first action includes: increasing the speed of the internal fan, and turning off the compressor and the external fan; the second action includes: adjusting the speed of the internal fan to the maximum, turning off the compressor and the external fan, and controlling the alarm unit to issue an alarm signal; the third action includes: adjusting the speed of the internal fan to the maximum, turning off the compressor and the external fan, swinging the air guide plate, and controlling the alarm unit to issue an alarm signal.

5. The refrigerant leakage detection and control method according to claim 3, characterized in that, When the refrigerant concentration change rate is less than the second concentration change rate threshold, the process of controlling the air conditioner to perform the processing action based on the detected refrigerant concentration includes: Compare the detected concentration difference with the fifth difference threshold; When the detected concentration difference is greater than or equal to the fifth difference threshold, the air conditioner is controlled to perform the fourth action; The fourth action includes: controlling the internal fan to run at low speed for a fourth set time and then turning off the internal fan.

6. The refrigerant leakage detection and control method according to claim 3, characterized in that, After controlling the air conditioner to perform the processing action based on the detected refrigerant concentration when the refrigerant concentration change rate is greater than the first concentration change rate threshold, the refrigerant leak detection and control method further includes: The system continuously executes actions based on the air conditioner status, the refrigerant dataset, the refrigerant condition, and the detected refrigerant concentration, controlling the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located.

7. The refrigerant leakage detection and control method according to claim 2, characterized in that, When it is determined that the refrigerant situation indicates a refrigerant leak in the air conditioner, the refrigerant concentration change rate is obtained based on the refrigerant dataset, including: Multiple concentration change rates are obtained based on multiple refrigerant concentrations, wherein the concentration change rate = (refrigerant concentration at the next moment - refrigerant concentration at the previous moment) / first interval duration; The refrigerant concentration change rate is obtained based on multiple concentration change rates; The refrigerant concentration change rate is the maximum value among a plurality of concentration change rates.

8. The refrigerant leakage detection and control method according to claim 1, characterized in that, The processing action also includes a fifth action; The step of controlling the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located, based on the air conditioner status, the refrigerant data set, the refrigerant condition, and the refrigerant detection concentration, further includes: When the air conditioner is in standby mode, determine whether the refrigerant situation indicates a refrigerant leak in the air conditioner. When it is determined that the air conditioner is leaking refrigerant, the air conditioner is controlled to perform the fifth action. The fifth action includes: adjusting the internal fan speed to the maximum and controlling the alarm unit to issue an alarm signal.

9. The refrigerant leakage detection and control method according to claim 1, characterized in that, After the air conditioner is powered on and its air conditioning status is obtained, the process further includes: Refrigerant concentrations are periodically collected at multiple times to obtain a refrigerant dataset; The process is repeated to obtain the refrigerant status and refrigerant detection concentration of the air conditioner based on the refrigerant dataset. The system continuously executes actions based on the air conditioner status, the refrigerant dataset, the refrigerant condition, and the detected refrigerant concentration, controlling the air conditioner to perform processing actions to reduce the refrigerant concentration in the environment where the air conditioner is located.

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