Refrigerant leakage detection control method and air conditioner

Abstract

The invention provides a refrigerant leakage detection control method and an air conditioner, and relates to the technical field of air conditioner sterilization, and the method comprises the following steps: subtracting a second concentration change rate from a first concentration change rate to obtain a concentration change rate difference value; if yes, whether the first concentration difference value is larger than or equal to a hysteresis value or not is judged; if yes, whether any first concentration larger than an explosion alarm threshold value exists or not is judged; if yes, an alarm is given, refrigerant leakage control is executed, and a refrigerant leakage fault is determined; and if not, refrigerant leakage control is executed, and a refrigerant leakage fault is determined. According to the embodiment of the invention, the actual refrigerant leakage rate and concentration can be accurately recognized, the situation that misinformation is caused by other gases, user experience is affected is prevented, and the potential safety hazard problem of the environment is eliminated in time.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerant leakage detection for air conditioners, and in particular to a refrigerant leakage detection control method and an air conditioner. Background Art

[0002] With the upgrading of environmental regulations on refrigerant requirements for refrigeration equipment, air conditioning products equipped with refrigerant leakage detection functions have gradually been put on the agenda. Its purpose is to detect and identify refrigerant leaks in air conditioning equipment in a timely manner and alarm to inform users. The technology and research patents on refrigerant leakage detection are beginning to increase, but related products with refrigerant detection sensors have not yet been popularized, and the general processing method is: the sensor detects that the refrigerant concentration exceeds the threshold and returns an alarm signal to the main control. The main control controls the load to perform operations to disperse and dilute the refrigerant (turn off the compressor, increase the wind speed of the internal fan, etc.). It is simple and crude, and is not personalized according to the actual application scenario. In a closed space environment, the triggering of the alarm indicates that the refrigerant concentration in the air is already very high, especially flammable and explosive refrigerants such as R290, which are quite dangerous and require early intervention and control.

[0003] Because the environmental parameters are constantly changing during the use of the air conditioner, the concentration value collected by the refrigerant sensor may not match the actual concentration value, or there may be other organisms (alcohol, formaldehyde, etc.), which may lead to a high possibility of false alarms and affect the user experience. Summary of the invention

[0004] To solve the above problems, an embodiment of the present invention provides a refrigerant leakage detection and control method, which is applied to an air conditioner, wherein the air conditioner includes a refrigerant sensor arranged at a relatively close position of a refrigerant loop and an organic gas sensor arranged at a relatively far position of the refrigerant loop; the method includes: obtaining a first concentration periodically collected by the refrigerant sensor and a second concentration periodically collected by the organic gas sensor; calculating a first concentration change rate according to the first concentrations of two cycles, calculating a second concentration change rate according to the second concentrations of the same period, and subtracting the first concentration change rate from the second concentration change rate to obtain a concentration change rate difference; if the concentration change rate difference is greater than or equal to zero, determining whether the first concentration difference is greater than or equal to a hysteresis value; the first concentration difference is obtained by subtracting the first concentration of a previous cycle from the first concentration of a subsequent cycle; if the first concentration difference is greater than or equal to the hysteresis value, determining whether any of the first concentrations is greater than an explosion alarm threshold; if any of the first concentrations is greater than or equal to the explosion alarm threshold, an alarm is issued, refrigerant leakage control is executed, and a refrigerant leakage fault is determined; if all of the first concentrations are less than the explosion alarm threshold, refrigerant leakage control is executed and a refrigerant leakage fault is determined.

[0005] The embodiment of the present invention collects concentration information at different locations and compares the concentration change rate to determine whether a refrigerant leakage occurs, and then compares the difference in concentration collected at closer locations in the refrigerant loop to determine whether there is an explosion risk, and performs targeted alarms or refrigerant leakage control operations. It can accurately identify the actual refrigerant leakage rate and concentration, prevent false alarms due to other gases, affect the user experience, and promptly eliminate safety hazards in the environment.

[0006] Optionally, the method also includes: if the first concentration difference is less than the hysteresis value, then determining whether the first concentration difference is less than the negative hysteresis value; the negative hysteresis value is the opposite of the hysteresis value; if the first concentration difference is less than the negative hysteresis value, then determining whether any of the first concentrations is greater than the explosion alarm threshold; if any of the first concentrations is greater than or equal to the explosion alarm threshold, then alarming, executing refrigerant leakage control, and determining it as a refrigerant leakage fault; if all of the first concentrations are less than the explosion alarm threshold and it is not determined to be a refrigerant leakage fault, then performing a module self-check, and if the self-check is abnormal, it is determined to be a refrigerant sensor fault and the compressor is shut down.

[0007] In the embodiment of the present invention, when the refrigerant leaks, the refrigerant concentration collected by the sensor will change from low to high and then to low. When the first concentration decreases directly without going through an increasing process, it can be considered that the refrigerant sensor is faulty.

[0008] Optionally, the method also includes: if the first concentration difference is greater than or equal to the negative value of the hysteresis loop, determining whether it has been determined as a refrigerant leakage fault; if it has been determined as a refrigerant leakage fault, the compressor remains shut down; if it has not been determined as a refrigerant leakage fault, performing a module self-check, and if the self-check is abnormal, it is determined to be a refrigerant sensor fault and the compressor is shut down.

[0009] In the embodiment of the present invention, when the first concentration difference is greater than or equal to the negative value of the hysteresis loop, that is, there is no obvious concentration increase stage, it is necessary to check whether a refrigerant leakage fault has been determined before.

[0010] Optionally, the method further includes: if all of the first concentrations are less than the explosion alarm threshold and it is determined to be a refrigerant leakage fault, canceling the alarm, executing refrigerant leakage control, and determining it to be a refrigerant leakage fault.

[0011] In the embodiment of the present invention, when the refrigerant leaks but is lower than the explosion alarm threshold, there is no personal safety risk, and no alarm is performed to minimize interference with user use.

[0012] Optionally, if the concentration change rate difference is greater than or equal to zero, before judging whether the first concentration difference is greater than or equal to the hysteresis value, the method also includes: judging whether the air conditioner is turned on; if the air conditioner is turned on, continuing to execute the step of judging whether the first concentration difference is greater than or equal to the hysteresis value; if the air conditioner is not turned on, and any of the first concentrations is greater than the explosion alarm threshold, cutting off the strong power, using battery power to start up, as well as alarming, executing refrigerant leakage control, and determining it as a refrigerant leakage fault.

[0013] In the embodiment of the present invention, differentiated control logics are respectively set for the air conditioner in the running and shutdown states, which is more in line with the application scenario.

[0014] Optionally, the step of subtracting the second concentration change rate from the first concentration change rate to obtain a concentration change rate difference includes: subtracting the second concentration change rate from the first concentration change rate in a preset time period to obtain a change rate difference; and averaging a plurality of the change rate differences to obtain the concentration change rate difference in the preset time period.

[0015] In the embodiment of the present invention, the concentration change rate difference can be averaged by using multiple change rate difference values, which can improve the accuracy of data calculation and judgment.

[0016] Optionally, the collection period of the refrigerant sensor and the organic gas sensor is negatively correlated with the ambient temperature.

[0017] In the embodiment of the present invention, an adjustable collection period is provided, and the collection period is negatively correlated with the ambient temperature, thereby improving the adaptability to temperature changes and avoiding the adverse effects of temperature changes.

[0018] Optionally, the hysteresis value is 120% of the maximum absolute value of multiple working samples of the refrigerant sensor under various indoor environments; or, the alarm threshold is 90% of the target refrigerant explosion critical value.

[0019] In the embodiment of the present invention, the specific basis for determining the hysteresis value and the alarm threshold is defined, thereby improving the accuracy of determining whether the sampling concentration of the refrigerant sensor has changed and the accuracy of explosion warning determination.

[0020] An embodiment of the present invention provides an air conditioner, comprising a control module, a refrigerant sensor arranged at a relatively close position of a refrigerant loop, and an organic gas sensor arranged at a relatively far position of the refrigerant loop; the control module is used to execute the above-mentioned refrigerant leakage detection control method.

[0021] Optionally, the refrigerant sensor is arranged on the evaporator, and the organic gas sensor is arranged on the wire controller.

[0022] The air conditioner provided by the embodiment of the present invention can achieve the same technical effect as the above-mentioned refrigerant leakage detection and control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic flow chart of a refrigerant leakage detection and control method provided in an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of a control process of a refrigerant leakage detection control method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] In order to fill the above technical gaps and effectively solve the safety problems existing in air-conditioning refrigerant leakage, the embodiments of the present invention propose a new refrigerant leakage control method and air conditioner, which can not only solve the problem of accurate identification and effective control of refrigerant leakage, but also promptly eliminate the potential safety hazards in the environment.

[0027] Specifically, the embodiment of the present invention adds temperature and organic gas sensors, collects concentration information at multiple locations, and uses the main control to perform algorithm processing to accurately identify the actual refrigerant leakage rate and concentration, thereby preventing false alarms caused by other gases.

[0028] In this embodiment, the air conditioner is provided with a refrigerant sensor at a position close to the refrigerant loop, and an organic gas sensor at a position far from the refrigerant loop. Exemplarily, the refrigerant sensor is provided at the evaporator, and the organic gas sensor is provided at the wire controller. Both the refrigerant sensor and the organic gas sensor can collect the concentration of the refrigerant / organic gas in the air.

[0029] Figure 1 A schematic flow chart of a refrigerant leakage detection and control method in an embodiment of the present invention is shown. The method is applied to the above-mentioned air conditioner and comprises the following steps:

[0030] S102, obtaining a first concentration periodically collected by a refrigerant sensor and a second concentration periodically collected by an organic gas sensor.

[0031] The refrigerant sensor and the organic gas sensor collect data periodically, and both can collect data at the same time in the same cycle. Considering the influence of temperature, the collection cycle can be set in combination with the temperature. For example, the collection cycle of the refrigerant sensor and the organic gas sensor is negatively correlated with the ambient temperature. The higher the temperature, the smaller the collection cycle, and the lower the temperature, the larger the collection cycle.

[0032] S104, calculating a first concentration change rate according to the first concentrations of the two periods, calculating a second concentration change rate according to the second concentrations of the same period, and subtracting the second concentration change rate from the first concentration change rate to obtain a concentration change rate difference.

[0033] The first concentration change rate can be obtained by dividing the difference of the first concentrations collected in two cycles by the time difference between the two cycles, and the two cycles can be adjacent or non-adjacent. Similarly, the second concentration change rate can be obtained by dividing the difference of the two second concentrations collected at the same time by the time difference between the two cycles.

[0034] The concentration change rate difference is obtained by subtracting the first concentration change rate from the second concentration change rate. Considering that the refrigerant sensor is closer to the refrigerant loop, if a refrigerant leak occurs, its concentration change rate will be greater. The organic gas sensor is far away from the refrigerant loop, and the refrigerant will diffuse after leakage, and its concentration change rate will be relatively small.

[0035] If the concentration change rate difference is greater than zero, it means that the concentration value near the refrigerant loop rises quickly, while the concentration value far from the refrigerant loop rises slowly, indicating that the refrigerant loop may have a refrigerant leak. Or if the concentration change rate difference is equal to zero, further judgment is required. If the concentration change rate difference is less than zero, return to continue to execute S102.

[0036] Considering that there are multiple cycles of the first concentration and the second concentration, multiple first concentration change rates and second concentration change rates can be calculated to obtain multiple change rate differences, and the above concentration change rate difference can be determined based on the average value.

[0037] Based on this, the concentration change rate difference is obtained by subtracting the second concentration change rate from the first concentration change rate, including: subtracting a first concentration change rate in a preset time period from a second concentration change rate in the same period to obtain a change rate difference; averaging multiple change rate differences to obtain the concentration change rate difference in the preset time period. The same period means that the two first concentrations calculated to obtain the first concentration change rate and the two second concentrations calculated to obtain the second concentration change rate are at the same time.

[0038] S106: If the concentration change rate difference is greater than or equal to zero, determine whether the first concentration difference is greater than or equal to the hysteresis value.

[0039] The first concentration difference is obtained by subtracting the first concentration of the previous cycle from the first concentration of the subsequent cycle. Exemplarily, the hysteresis value is 120% of the maximum absolute value of the refrigerant sensor working multiple times under various indoor environments. The physical meaning of the hysteresis value is: the maximum absolute value of the refrigerant sensor working for a long time under various indoor environments * 120%.

[0040] The hysteresis value is mainly used to filter out the fluctuation of the sensor's normal working data. When it is greater than the hysteresis value, it is considered that the refrigerant concentration has actually changed. Otherwise, it is considered that the refrigerant concentration has not actually changed, thereby preventing false alarms.

[0041] S108: If the first concentration difference is greater than or equal to the hysteresis value, determine whether any of the first concentrations is greater than the explosion alarm threshold.

[0042] If the first concentration difference is greater than or equal to the hysteresis value, it means that the refrigerant concentration has actually changed and refrigerant leakage has occurred, but the degree of leakage still needs to be further judged, that is, whether the first concentration collected by the refrigerant sensor in the above-mentioned cycles is greater than the explosion alarm threshold.

[0043] S110: If any of the first concentrations is greater than or equal to the explosion alarm threshold, an alarm is triggered, refrigerant leakage control is performed, and a refrigerant leakage fault is determined.

[0044] When the first concentration is higher than the explosion alarm threshold, there is an explosion risk, and an alarm must be sounded immediately to alert the user to prevent harm to personal safety. When the refrigerant leaks but the first concentration is lower than the explosion alarm threshold, there is no personal safety risk. In order to minimize interference with user use, no alarm is performed, and only refrigerant leakage control and refrigerant leakage fault reporting are performed.

[0045] Exemplarily, the explosion alarm threshold is 90% of the target refrigerant explosion critical value.

[0046] S112: If all the first concentrations are less than the explosion alarm threshold, refrigerant leakage control is performed and a refrigerant leakage fault is determined.

[0047] If all the first concentrations are smaller than the explosion alarm threshold, no alarm is given and only refrigerant leakage control is performed and a refrigerant leakage fault is determined.

[0048] The refrigerant leakage detection and control method provided in the embodiment of the present invention collects concentration information at different positions and compares the concentration change rate to determine whether a refrigerant leakage occurs, and then compares the difference in concentration collected at closer positions in the refrigerant loop to determine whether there is an explosion risk, and performs targeted alarms or performs refrigerant leakage control operations. It can accurately identify the actual refrigerant leakage rate and concentration, prevent false alarms due to other gases, affect the user experience, and promptly eliminate safety hazards in the environment.

[0049] When the refrigerant leaks, the refrigerant concentration collected by the sensor will change from low to high and then to low. When the first concentration difference is greater than the hysteresis value, the refrigerant concentration is in the rising stage, and it can be determined that the refrigerant has just started to leak; when the first concentration difference is less than the negative hysteresis value, the refrigerant concentration is in the falling stage (continuous diffusion causes the concentration to decrease), and it can be determined that the refrigerant has completely leaked. When the first concentration decreases directly without going through the rising process, it can be considered that the refrigerant sensor is faulty. Based on this, the above method also includes:

[0050] If the first concentration difference is less than the hysteresis value, it is determined whether the first concentration difference is less than the negative hysteresis value; the negative hysteresis value is the opposite of the hysteresis value.

[0051] If the first concentration difference is less than the negative value of the hysteresis loop, it is determined whether any of the first concentrations is greater than the explosion alarm threshold. If the first concentrations collected by the refrigerant sensor in each of the above cycles are greater than the explosion alarm threshold, there is an explosion risk, and the user needs to be reminded immediately to prevent personal safety hazards; if all of the above first concentrations are less than the explosion alarm threshold, and it has not been determined to be a refrigerant leakage fault in the early stage, it is necessary to self-check to determine whether the refrigerant sensor is faulty.

[0052] If any of the first concentrations is greater than or equal to the explosion alarm threshold, an alarm is triggered, refrigerant leakage control is executed, and a refrigerant leakage fault is determined. If all first concentrations are less than the explosion alarm threshold and a refrigerant leakage fault is not determined, a module self-check is performed. If the self-check is abnormal, it is determined to be a refrigerant sensor fault and the compressor is shut down.

[0053] If all the first concentrations are less than the explosion alarm threshold and it is determined to be a refrigerant leakage fault, the alarm is canceled, the refrigerant leakage control is executed, and it is determined to be a refrigerant leakage fault. In the case where each first concentration is less than the explosion alarm threshold and it has been detected as a refrigerant leakage fault before, comprehensive consideration does not require an alarm, and only refrigerant leakage control and other operations are executed.

[0054] Furthermore, the above method also includes: if the first concentration difference is greater than or equal to the negative value of the hysteresis loop, determining whether it has been determined as a refrigerant leakage fault; if it has been determined as a refrigerant leakage fault, the compressor remains shut down; if it has not been determined as a refrigerant leakage fault, performing a module self-check, and if the self-check is abnormal, it is determined to be a refrigerant sensor fault and the compressor is shut down.

[0055] When the first concentration difference is greater than or equal to the negative value of the hysteresis loop, that is, there is no obvious concentration increase stage, it is necessary to check whether it has been determined as a refrigerant leakage fault before. If it has been determined as a refrigerant leakage fault before, the compressor will continue to shut down; if it has not been determined as a refrigerant leakage fault before, there may be a refrigerant sensor failure, which requires further self-checking to determine.

[0056] In this embodiment, a control method for refrigerant leakage in two states (operating and shutting down) of the air conditioner can also be used, and differentiated control is more suitable for application scenarios. Based on this, if the concentration change rate difference is greater than or equal to zero, before determining whether the first concentration difference is greater than or equal to the hysteresis value, the above method also determines whether the air conditioner is turned on, specifically including:

[0057] First, determine whether the air conditioner is turned on;

[0058] Secondly, if the air conditioner is turned on, continue to execute the above-mentioned step of determining whether the first concentration difference is greater than or equal to the hysteresis value; if the air conditioner is not turned on, and any of the first concentrations is greater than the explosion alarm threshold, cut off the strong power, use the battery to power on, and alarm, execute refrigerant leakage control, and determine it as a refrigerant leakage fault.

[0059] When the air conditioner is not turned on, once the first concentration is detected to be greater than the explosion alarm threshold, there is an explosion risk, and the user needs to be reminded immediately to prevent personal safety from being endangered. The specific operation is to switch from high-voltage power to battery power for alarm and refrigerant leakage control.

[0060] The refrigerant leakage detection and control method provided in the embodiment of the present invention mainly identifies the refrigerant sensor placed at a relatively close position (evaporator) of the refrigerant loop, and its concentration change rate V c =|△S c | / T(△S c is the concentration change per unit time, T is the unit time), and the organic gas sensor placed at a remote position in the refrigerant loop (wired controller), its concentration change rate V A =|△S A | / T(△S A is the concentration change per unit time, T is the unit time), the difference between the two is B = V c- V A , alarm threshold D, hysteresis value E.

[0061] Figure 2 The control process diagram of the refrigerant leakage detection control method provided by the embodiment of the present invention is shown, and the specific implementation method is as follows:

[0062] S1, the air conditioner is powered on and the concentration value is collected.

[0063] The program algorithm controls the main chip to call the exclusive storage space to store the concentration value collected by the internal machine refrigerant sensor. The program algorithm controls the concentration collection method as follows: collect once immediately after power-on, and then collect the concentration values ​​of two sensors at the same time every Ts to obtain V c 、V A The above concentration collection is also performed periodically when the air conditioner is not turned on.

[0064] When the temperature is ≥30℃, T=0.3s; when 5≤ the temperature is <30℃, T=0.5s; when the temperature is <5℃, T=0.8s. 5Ts in succession, 6 groups of S are obtained c and S A , respectively denote S c1 To S c6 and S A1 To S A6 , we get 5 groups of V c and V A and B, find the average and get △B.

[0065] S2, determine whether △B≥0 is satisfied. If yes, execute S3, otherwise execute S1;

[0066] S3, determine whether the machine is running. If yes, execute S4, otherwise execute S17;

[0067] S4, judge S c6 -S c1 ≥E is true. If yes, execute S5, otherwise execute S8;

[0068] S5, judge S c ≥D is true, if yes, execute S6, otherwise execute S7;

[0069] S6, immediately alarm, determine the refrigerant leakage, execute the refrigerant leakage control, and report the refrigerant leakage fault; return to execution 1;

[0070] S7, no alarm, determine refrigerant leakage, execute refrigerant leakage control, report refrigerant leakage fault, and execute S1;

[0071] S8, judge △S c6 -△S c1 <-E is true, if so, execute S9, otherwise execute S13;

[0072] S9, judge S c ≥D is true, if yes, execute S10, otherwise execute S11;

[0073] S10, immediately alarm, determine the refrigerant leakage, execute the refrigerant leakage control, report the refrigerant leakage fault, and execute S1;

[0074] S11, determine whether there is a refrigerant leakage fault, if yes, execute S12, otherwise execute S15;

[0075] S12, cancel the alarm, determine the refrigerant leakage, execute the refrigerant leakage control, report the refrigerant leakage fault, and execute S1;

[0076] S13, determine whether there is a refrigerant leakage fault, if yes, execute S14, otherwise execute S15;

[0077] S14: Report a refrigerant shortage fault, the compressor remains stopped, and the cooling and heating functions are not performed, and S1 is executed;

[0078] S15, perform module self-test to determine whether there is no abnormality in the self-test. If there is no abnormality in the self-test, execute S1; otherwise, execute S16;

[0079] S16, reporting refrigerant sensor failure, stopping the compressor, and not performing cooling and heating functions;

[0080] S17, judge any S c ≥D is true, if yes, execute S18, otherwise execute S1;

[0081] S18, immediately cut off the strong power (24V and above), switch to battery power, turn on the machine, and execute S6.

[0082] The embodiment of the present invention proposes a software algorithm control method for refrigerant leakage in two states (operating and shutting down) of the air conditioner, and the differentiated control is more in line with the application scenario; it proposes load processing and response methods under different conditions of refrigerant leakage detection, pre-emptively, quickly and efficiently eliminates high-concentration refrigerants, and differentiates alarms to remind users. By using a control algorithm to accurately identify and calculate the refrigerant concentration leakage rate, and combining the real-time collected refrigerant concentration value with the alarm threshold, the air conditioner load is controlled to perform different actions respectively, and the algorithm processing after the refrigerant leakage can be solved from the software control aspect.

[0083] An embodiment of the present invention further provides an air conditioner, comprising a control module, a refrigerant sensor arranged at a relatively close position of the refrigerant loop, and an organic gas sensor arranged at a relatively far position of the refrigerant loop; the control module is used to execute the above-mentioned refrigerant leakage detection control method.

[0084] As a feasible approach, the refrigerant sensor is disposed on the evaporator, and the organic gas sensor is disposed on the wire controller.

[0085] The air conditioner provided by the embodiment of the present invention can achieve the same technical effect as the above-mentioned refrigerant leakage detection and control method.

[0086] The embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the method provided in the above embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0087] Of course, those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the control device through a computer, and the program can be stored in a computer-readable storage medium. When the program is executed, it may include the processes of the above-mentioned method embodiments, wherein the storage medium may be a memory, a disk, an optical disk, etc.

[0088] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

[0089] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0090] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0091] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A refrigerant leakage detection and control method, characterized in that: Applied to an air conditioner, the air conditioner includes a refrigerant sensor arranged at a position close to the refrigerant loop and an organic gas sensor arranged at a position far from the refrigerant loop; the method includes: Acquire a first concentration periodically collected by the refrigerant sensor and a second concentration periodically collected by the organic gas sensor; Calculating a first concentration change rate according to the first concentrations of two periods, calculating a second concentration change rate according to the second concentrations of the same period, and subtracting the second concentration change rate from the first concentration change rate to obtain a concentration change rate difference; If the concentration change rate difference is greater than or equal to zero, then determining whether the first concentration difference is greater than or equal to the hysteresis value; the first concentration difference is obtained by subtracting the first concentration in the previous cycle from the first concentration in the subsequent cycle; If the first concentration difference is greater than or equal to the hysteresis value, determining whether any of the first concentrations is greater than an explosion alarm threshold; If any of the first concentrations is greater than or equal to the explosion alarm threshold, an alarm is triggered, refrigerant leakage control is performed, and a refrigerant leakage fault is determined; If all of the first concentrations are less than the explosion alarm threshold, refrigerant leakage control is performed and a refrigerant leakage fault is determined.

2. The method according to claim 1, characterized in that The method further comprises: If the first concentration difference is less than the hysteresis value, determining whether the first concentration difference is less than a negative hysteresis value; the negative hysteresis value is the opposite of the hysteresis value; If the first concentration difference is less than the hysteresis negative value, determining whether any of the first concentrations is greater than the explosion alarm threshold; If any of the first concentrations is greater than or equal to the explosion alarm threshold, an alarm is triggered, refrigerant leakage control is performed, and a refrigerant leakage fault is determined; If all of the first concentrations are less than the explosion alarm threshold and it is not determined to be a refrigerant leakage fault, a module self-check is performed. If the self-check is abnormal, it is determined to be a refrigerant sensor fault and the compressor is shut down.

3. The method according to claim 2, characterized in that The method further comprises: If the first concentration difference is greater than or equal to the negative value of the hysteresis loop, determining whether a refrigerant leakage fault has been determined; If the fault is confirmed to be a refrigerant leakage, the compressor remains stopped; If the fault is not determined to be a refrigerant leakage, the module will be self-checked. If the self-check is abnormal, it will be determined to be a refrigerant sensor fault and the compressor will be shut down.

4. The method according to claim 2, characterized in that The method further comprises: If all of the first concentrations are less than the explosion alarm threshold and it is determined to be a refrigerant leakage fault, the alarm is canceled, refrigerant leakage control is performed, and it is determined to be a refrigerant leakage fault.

5. The method according to claim 1, characterized in that If the concentration change rate difference is greater than or equal to zero, before determining whether the first concentration difference is greater than or equal to the hysteresis value, the method further includes: Determine whether the air conditioner is turned on; If the air conditioner is turned on, continue to execute the step of determining whether the first concentration difference is greater than or equal to the hysteresis value; If the air conditioner is not turned on and any of the first concentrations is greater than the explosion alarm threshold, the strong power is cut off, the battery is used to power on, an alarm is sounded, refrigerant leakage control is performed, and a refrigerant leakage fault is determined.

6. The method according to claim 1, characterized in that The step of subtracting the second concentration change rate from the first concentration change rate to obtain a concentration change rate difference comprises: Subtracting the second concentration change rate in the same period from the first concentration change rate in a preset time period to obtain a change rate difference; The concentration change rate difference in the preset time period is obtained by averaging a plurality of the change rate differences.

7. The method according to claim 1, characterized in that The collection period of the refrigerant sensor and the organic gas sensor is negatively correlated with the ambient temperature.

8. The method according to any one of claims 1 to 7, characterized in that: The hysteresis value is 120% of the maximum absolute value of the refrigerant sensor working multiple times under various indoor environments; or, the alarm threshold is 90% of the target refrigerant explosion critical value.

9. An air conditioner, characterized in that: It includes a control module, a refrigerant sensor arranged at a position close to the refrigerant loop, and an organic gas sensor arranged at a position far from the refrigerant loop; The control module is used to execute the refrigerant leakage detection control method according to any one of claims 1 to 8.

10. The air conditioner according to claim 9, characterized in that: The refrigerant sensor is arranged on the evaporator, and the organic gas sensor is arranged on the wire controller.

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