Air conditioner and control method of air conditioner

Abstract

The invention discloses an air conditioner and a control method of the air conditioner, the air conditioner comprises an outdoor unit and an indoor unit, and the outdoor unit communicates with the indoor unit through a 24V communication mode; a refrigerant circulation loop; the pressure sensor is used for collecting a pipeline pressure value at the four-way valve; the current transformer is used for collecting the actual operation current of the compressor; the controller is connected with the pressure sensor and the current transformer, and the controller is configured to obtain a pipeline pressure value and an actual operation current after it is determined that the operation duration of the compressor reaches a preset duration; and determining the fluorine lack state of the air conditioner according to whether the pipeline pressure value and the actual running current meet the preset fluorine lack condition or not. By the adoption of the air conditioner, fluorine deficiency detection of the air conditioner can be achieved jointly through the pipeline pressure value and the actual running current, so that fluorine deficiency of the air conditioner can be detected in time, the problem of misjudgment of fluorine deficiency is avoided, and the accuracy of fluorine deficiency detection is improved.

Description

Technical Field

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

[0002] In the related art, existing air conditioners detect whether the air conditioner is short of fluorine by using temperature values ​​such as exhaust temperature, coil temperature or intake temperature collected by temperature sensors. However, in the above-mentioned method of detecting fluorine deficiency, the temperature value changes very slowly during the operation of the air-conditioning system, and the temperature value is affected by environmental factors and has errors, which leads to untimely detection of fluorine deficiency and misjudgment of fluorine deficiency. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an air conditioner, which can detect the lack of fluorine in the air conditioner by using the pipeline pressure value and the actual operating current, so that the lack of fluorine in the air conditioner can be detected in time, avoiding the problem of misjudgment of the lack of fluorine and improving the accuracy of the lack of fluorine detection.

[0004] A second object of the present invention is to provide a control method for an air conditioner.

[0005] In order to solve the above problems, the first aspect of the present invention provides an air conditioner, comprising: an outdoor unit and an indoor unit, wherein the outdoor unit communicates with the indoor unit via a 24V communication mode; a refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, an outdoor heat exchanger, a throttling device, an indoor heat exchanger and a four-way valve; a pressure sensor, for collecting the pipeline pressure value at the four-way valve; a current transformer, for collecting the actual operating current of the compressor; a controller, wherein the controller is connected to the pressure sensor and the current transformer, and the controller is configured to: obtain the pipeline pressure value and the actual operating current after determining that the operating time of the compressor reaches a preset time; and determine the fluorine deficiency state of the air conditioner according to whether the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition.

[0006] According to the air conditioner of the embodiment of the present invention, the fluorine deficiency state of the air conditioner is detected by comparing the pipeline pressure value and the actual operating current collected in real time with the preset fluorine deficiency condition. If the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition, it is determined that the air conditioner is in a fluorine deficiency state. Therefore, compared with the method of detecting fluorine deficiency in the air conditioner by temperature value, in the present application, whether the air conditioner is in a fluorine deficiency state is judged by the pipeline pressure value and the actual operating current collected in real time, instead of judging whether the air conditioner is fluorine deficiency by temperature value, so that the fluorine deficiency of the air conditioner can be detected in time, the problem of misjudgment of fluorine deficiency is avoided, and the accuracy of fluorine deficiency detection is improved.

[0007] In some embodiments, for determining the fluorine-deficient state of the air conditioner based on whether the pipeline pressure value and the actual operating current meet the preset fluorine-deficient condition, the controller is specifically configured to: obtain a rated pressure value and a rated current value; obtain a fluorine-deficient pressure value based on the rated pressure value; obtain a fluorine-deficient current value based on the rated current value; if the pipeline pressure value is lower than the fluorine-deficient pressure value and the actual operating current is lower than the fluorine-deficient current value, determine that the air conditioner is in a fluorine-deficient state; if the pipeline pressure value is higher than the fluorine-deficient pressure value and / or the actual operating current is higher than the fluorine-deficient current value, determine that the air conditioner is not in a fluorine-deficient state.

[0008] In some embodiments, for the acquisition of the rated pressure value and the rated current value, the controller is specifically configured to: acquire the current operating frequency of the compressor; and acquire the rated pressure value and the rated current value according to the current operating frequency.

[0009] In some embodiments, for obtaining the fluorine-deficient pressure value based on the rated pressure value, the controller is specifically configured to: obtain the outdoor ambient temperature; obtain a pressure adjustment coefficient based on the outdoor ambient temperature; multiply the rated pressure value by the pressure adjustment coefficient to obtain a first product value, and use the first product value as the fluorine-deficient pressure value.

[0010] In some embodiments, for obtaining the fluorine-deficient current value based on the rated current value, the controller is specifically configured to: obtain the outdoor ambient temperature; obtain the current regulation coefficient based on the outdoor ambient temperature; multiply the rated current value by the current regulation coefficient to obtain a second product value, and use the second product value as the fluorine-deficient current value.

[0011] In some embodiments, the controller is further configured to: obtain the outdoor ambient temperature and the current temperature value of the outdoor heat exchanger; obtain an absolute temperature difference based on the outdoor ambient temperature and the current temperature value; obtain exhaust superheat; and determine the fluorine deficiency state of the air conditioner based on the absolute temperature difference or the exhaust superheat.

[0012] A second aspect of the present invention provides a method for controlling an air conditioner, which is characterized in that it is used for the air conditioner described in the above embodiment, comprising: after determining that the operating time of the compressor reaches a preset time, obtaining the pipeline pressure value at the four-way valve and the actual operating current of the compressor; determining the fluorine deficiency state of the air conditioner based on whether the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition.

[0013] According to the control method of the air conditioner in the embodiment of the present invention, the fluorine deficiency state of the air conditioner is detected by comparing the pipeline pressure value and the actual operating current collected in real time with the preset fluorine deficiency condition. If the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition, it is determined that the air conditioner is in a fluorine deficiency state. Therefore, compared with the method of detecting fluorine deficiency in the air conditioner by temperature value, in the present application, whether the air conditioner is in a fluorine deficiency state is judged by the pipeline pressure value and the actual operating current collected in real time, instead of judging whether the air conditioner is fluorine deficiency by temperature value, so that the fluorine deficiency of the air conditioner can be detected in time, the problem of misjudgment of fluorine deficiency is avoided, and the accuracy of fluorine deficiency detection is improved.

[0014] In some embodiments, the fluorine deficiency state of the air conditioner is determined based on whether the pipeline pressure value and the actual operating current meet preset fluorine deficiency conditions, including: obtaining a rated pressure value and a rated current value; obtaining a fluorine deficiency pressure value based on the rated pressure value; obtaining a fluorine deficiency current value based on the rated current value; if the pipeline pressure value is lower than the fluorine deficiency pressure value and the actual operating current is lower than the fluorine deficiency current value, determining that the air conditioner is in a fluorine deficiency state; if the pipeline pressure value is higher than the fluorine deficiency pressure value, or the actual operating current is higher than the fluorine deficiency current value, determining that the air conditioner is not in a fluorine deficiency state.

[0015] In some embodiments, obtaining a fluorine-deficient pressure value according to the rated pressure value includes: obtaining an outdoor ambient temperature; obtaining a pressure adjustment coefficient according to the outdoor ambient temperature; multiplying the rated pressure value by the pressure adjustment coefficient to obtain a first product value, and using the first product value as the fluorine-deficient pressure value.

[0016] In some embodiments, obtaining a fluorine-deficient current value according to the rated current value includes: obtaining an outdoor ambient temperature; obtaining a current regulation coefficient according to the outdoor ambient temperature; multiplying the rated current value by the current regulation coefficient to obtain a second product value, and using the second product value as the fluorine-deficient current value.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of the circuit connection of an air conditioner according to an embodiment of the present invention;

[0020] Figure 2is a flow chart of a controller control process according to one embodiment of the present invention;

[0021] Figure 3 is a flow chart of a controller control process according to another embodiment of the present invention;

[0022] Figure 4 is a coordinate diagram of operating frequency and pipeline pressure value according to an embodiment of the present invention;

[0023] Figure 5 is a coordinate diagram of an operating frequency and an actual operating current according to an embodiment of the present invention;

[0024] Figure 6 is a flow chart of a controller control process according to another embodiment of the present invention;

[0025] Figure 7 is a coordinate diagram of outdoor environment temperature and pressure adjustment coefficient according to an embodiment of the present invention;

[0026] Figure 8 is a coordinate diagram of outdoor environment temperature and current regulation coefficient according to an embodiment of the present invention;

[0027] Fig. 9 is a flow chart of a controller control process according to another embodiment of the present invention;

[0028] Fig.10 is a flow chart of a method for controlling an air conditioner according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] Air conditioner 10;

[0031] Compressor 1; outdoor heat exchanger 2; throttling device 3; indoor heat exchanger 4; four-way valve 5; pressure sensor 6; DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0033] The air conditioner needs to circulate refrigerant when running in cooling mode or heating mode. Due to the installation of the air conditioner and other reasons, there is a risk of refrigerant leakage in the air conditioner. When the refrigerant leaks, it needs to be replenished in time to avoid affecting the cooling or heating effect of the air conditioner and damaging the compressor.

[0034] In the related art, existing air conditioners detect whether the air conditioner is short of fluorine by using temperature values ​​such as exhaust temperature, coil temperature or intake temperature collected by temperature sensors. However, in the above-mentioned method of detecting fluorine deficiency, the temperature value changes very slowly during the operation of the air-conditioning system, and the temperature value is greatly affected by environmental factors, which leads to untimely detection of fluorine deficiency and misjudgment of fluorine deficiency faults.

[0035] In order to solve the above problems, the first aspect of the embodiment of the present invention provides an air conditioner, which can realize the detection of air conditioner fluorine deficiency through the pipeline pressure value and the actual operating current, so that the air conditioner fluorine deficiency can be detected in time, avoiding the problem of misjudgment of fluorine deficiency and improving the accuracy of fluorine deficiency detection.

[0036] Reference below Figure 1 An air conditioner 10 according to an embodiment of the present invention is described. The air conditioner 10 includes an outdoor unit, an indoor unit, a refrigerant circulation loop, a pressure sensor 6, a current transformer, and a controller.

[0037] Among them, the outdoor unit and the indoor unit communicate through the 24V communication mode; the refrigerant circulation loop, such as Figure 1 As shown, the refrigerant circulates in a loop composed of a compressor 1, an outdoor heat exchanger 2, a throttling device 3, an indoor heat exchanger 4 and a four-way valve 5; a pressure sensor 6 is used to collect the pipeline pressure value at the four-way valve; a current transformer is used to collect the actual operating current of the compressor; and a controller is connected to the pressure sensor and the current transformer.

[0038] In the embodiment, since the outdoor unit and the indoor unit communicate with each other through the 24V communication mode, that is, the outdoor unit and the indoor unit transmit switch signals through the 24V communication mode, for example, the indoor unit sends a cooling start signal or a heating start signal to the outdoor unit through the 24V communication mode, the air conditioner in the present application is a duct unit. In addition, the pressure sensor 6 is arranged at the E pipe of the four-way valve, and the pipeline pressure value detected when running the cooling mode is the low pressure value, and the pipeline pressure value detected when running the heating mode is the high pressure value.

[0039] The controller is configured to determine the fluorine deficiency state of the air conditioner through the following steps.

[0040] After determining that the running time of the compressor reaches the preset time, the pipeline pressure value and the actual running current are obtained.

[0041] Specifically, after the controller determines that the operating time of the compressor has reached a preset time, where the preset time can be 10 minutes and there is no limit to this, the pressure sensor is used to collect the pipeline pressure value at the four-way valve, and the current transformer is used to collect the actual operating current of the compressor, to ensure accurate acquisition of the pipeline pressure value and the actual operating current.

[0042] Then, the fluorine deficiency state of the air conditioner is determined based on whether the pipeline pressure value and the actual operating current meet the preset fluorine deficiency conditions.

[0043] Specifically, the existing air conditioner detects whether the air conditioner is short of fluorine through the exhaust temperature value, coil temperature value or intake temperature value and other temperature values ​​collected by the temperature sensor. However, in the above-mentioned method of detecting short of fluorine, the temperature value changes very slowly during the operation of the air-conditioning system, and the temperature value is greatly affected by factors such as the environment, which leads to the problem of untimely detection of short of fluorine and misjudgment of short of fluorine. In order to solve this problem, in the present application, whether the air conditioner is in a short of fluorine state is determined by the pipeline pressure value and the actual operating current collected in real time, instead of determining whether the air conditioner is short of fluorine by the temperature value. Since the pipeline pressure value and the actual operating current are collected in real time, it is possible to detect in time whether the air conditioner is in a short of fluorine state, and the pipeline pressure value and the actual operating current can be misjudged. The actual operating current changes rapidly during the operation of the air-conditioning system and is less affected by environmental factors, thereby avoiding the problem of misjudgment of fluorine deficiency and improving the accuracy of fluorine deficiency detection. That is to say, a preset fluorine deficiency condition for detecting whether the air conditioner is lacking fluorine is pre-stored in the controller, and the fluorine deficiency state of the air conditioner is determined by comparing the pipeline pressure value and the actual operating current with the preset fluorine deficiency condition. For example, the preset fluorine deficiency condition is the pipeline pressure value and operating current corresponding to the fluorine deficiency state of the air conditioner. If the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition, it is determined that the air conditioner is in a fluorine deficiency state. Conversely, if the pipeline pressure value and the actual operating current do not meet the preset fluorine deficiency condition, it is determined that the air conditioner is not in a fluorine deficiency state. Therefore, compared with the method of detecting whether the air conditioner is lacking fluorine by temperature value, the present application determines whether the air conditioner is in a state of lacking fluorine by the real-time collected pipeline pressure value and actual operating current, instead of judging whether the air conditioner is lacking fluorine by temperature value. Since the pipeline pressure value and the actual operating current are collected in real time, it is possible to detect in time that the air conditioner is in a state of lacking fluorine, and the pipeline pressure value and the actual operating current change rapidly during the operation of the air-conditioning system and are less affected by environmental factors, thereby avoiding the problem of misjudgment of fluorine deficiency, improving the accuracy of fluorine deficiency detection, effectively ensuring the cooling and heating effects, and when the system lacks refrigerant, being able to report the fault in time and control the compressor to stop running, thereby avoiding the problem of compressor damage due to lack of fluorine in the air conditioner.

[0044] According to the air conditioner of the embodiment of the present invention, the fluorine deficiency state of the air conditioner is detected by comparing the pipeline pressure value and the actual operating current collected in real time with the preset fluorine deficiency condition. If the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition, it is determined that the air conditioner is in a fluorine deficiency state. Therefore, compared with the method of detecting fluorine deficiency in the air conditioner by temperature value, in the present application, whether the air conditioner is in a fluorine deficiency state is judged by the pipeline pressure value and the actual operating current collected in real time, instead of judging whether the air conditioner is fluorine deficiency by temperature value, so that the fluorine deficiency of the air conditioner can be detected in time, the problem of misjudgment of fluorine deficiency is avoided, and the accuracy of fluorine deficiency detection is improved.

[0045] In some embodiments, the fluorine deficiency state of the air conditioner is determined based on whether the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition, such as Figure 2 As shown, the controller is specifically configured to perform the following steps.

[0046] Step S3, obtaining the rated pressure value and the rated current value.

[0047] Step S4, obtaining the fluorine-deficient pressure value according to the rated pressure value.

[0048] Step S5, obtaining the fluorine-deficient current value according to the rated current value.

[0049] Step S6: if the pipeline pressure value is lower than the fluorine deficiency pressure value and the actual operating current is lower than the fluorine deficiency current value, it is determined that the air conditioner is in a fluorine deficiency state.

[0050] Step S7: if the pipeline pressure value is higher than the fluorine deficiency pressure value and / or the actual operating current is higher than the fluorine deficiency current value, it is determined that the air conditioner is in a non-fluorine deficiency state.

[0051] Specifically, the existing air conditioner detects whether the air conditioner is short of fluorine through the exhaust temperature value, coil temperature value or intake temperature value and other temperature values ​​collected by the temperature sensor. However, in the above-mentioned method of detecting fluorine deficiency, the temperature value changes very slowly during the operation of the air-conditioning system, and the temperature value is greatly affected by factors such as the environment, which leads to the problem of untimely detection of fluorine deficiency and misjudgment of fluorine deficiency. In order to solve this problem, in the present application, it is determined whether the air conditioner is in a fluorine deficiency state by judging whether the pipeline pressure value is lower than the fluorine deficiency pressure value and whether the actual operating current is lower than the fluorine deficiency current value, so that the air conditioner can be detected in time if the air conditioner is short of fluorine, the problem of misjudgment of fluorine deficiency is avoided, and the accuracy of fluorine deficiency detection is improved. That is to say, when the air conditioner is short of fluorine, the pipeline pressure value is reduced, so that the load of the compressor is reduced, thereby causing the compressor to The operating current is reduced, so in this application, the air conditioner fluorine deficiency detection is realized by the pipeline pressure value and the actual operating current, that is, the controller obtains the rated pressure value of the four-way valve and the rated current value of the compressor, wherein the rated pressure value and the rated current value are the rated pressure value and the rated current value calibrated when the air conditioner fluorine quantity is normally operating, and then the fluorine deficiency pressure value is calculated according to the rated pressure value, and then the fluorine deficiency current value is calculated according to the rated current value. If the pipeline pressure value is lower than the fluorine deficiency pressure value and the actual operating current is lower than the fluorine deficiency current value, it means that the pipeline pressure value and the actual operating current of the air conditioner are reduced due to fluorine deficiency, and it is determined that the air conditioner is in a fluorine deficiency state. If the pipeline pressure value is higher than the fluorine deficiency pressure value and / or the actual operating current is higher than the fluorine deficiency current value, it means that the fluorine quantity of the air conditioner is normal, and it is determined that the air conditioner is in a non-fluorine deficiency state. Therefore, in this application, by simultaneously judging whether the air conditioner is fluorine deficient by the pipeline pressure value and the actual operating current, it can detect the air conditioner fluorine deficiency in time, avoid the problem of misjudgment of fluorine deficiency, and improve the accuracy of fluorine deficiency detection.

[0052] In some embodiments, for obtaining the rated pressure value and the rated current value, such as Figure 3 As shown, the controller is specifically configured to perform the following steps.

[0053] Step S8, obtaining the current operating frequency of the compressor.

[0054] Step S9, obtaining the rated pressure value and the rated current value according to the current operating frequency.

[0055] Specifically, when the outdoor unit receives a 24V cooling start signal, the operating frequency of the compressor is controlled by controlling the pipeline pressure value. Under fixed operating conditions of the air conditioner, such as rated cooling conditions, for example, the rated cooling conditions are 35 / 23.9 outdoors and 26.7 / 19.4 indoors, the operating frequency of the compressor is changed by controlling the pipeline pressure value, and the rated pressure value and rated current value corresponding to the compressor at different operating frequencies are calibrated, such as Figure 4 and Figure 5As shown, the operating frequency of the compressor corresponds to the rated pressure value or the rated current value, and the rated pressure value and the rated current value corresponding to different operating frequencies are stored in the controller. Thus, the controller obtains the current operating frequency of the compressor, and inquires the rated pressure value and the rated current value according to the current operating frequency, thereby realizing the fluorine deficiency detection of the air conditioner. For example, Figure 4 and Figure 5 As shown, when the current operating frequency of the compressor is 20HZ, the rated pressure value is 0.98MPA and the rated current value is 7A. In addition, the rated pressure value is inversely proportional to the operating frequency of the compressor, and the rated current value is directly proportional to the operating frequency of the compressor.

[0056] In some embodiments, for obtaining the fluorine-deficient pressure value according to the rated pressure value, such as Figure 6 As shown, the controller is specifically configured to perform the following steps.

[0057] Step S10, obtaining the outdoor ambient temperature.

[0058] Step S11, obtaining a pressure adjustment coefficient according to the outdoor ambient temperature.

[0059] Step S12, performing a product operation on the rated pressure value and the pressure adjustment coefficient to obtain a first product value, and using the first product value as the fluorine deficiency pressure value.

[0060] Specifically, since the outdoor ambient temperature during the operation of the air conditioner will affect the rated pressure value, the rated pressure value is adjusted by the pressure adjustment coefficient in the present application to obtain the fluorine deficiency pressure value, thereby realizing the fluorine deficiency detection of the air conditioner through the fluorine deficiency pressure value, which greatly improves the accuracy of fluorine deficiency detection and avoids misjudgment of fluorine deficiency. That is to say, the outdoor ambient temperature and the pressure adjustment coefficient are in a one-to-one correspondence in the controller, so the controller obtains the outdoor ambient temperature detected by the temperature sensor, and queries the corresponding pressure adjustment coefficient through the detected outdoor ambient temperature. For example, Figure 7 As shown, if the outdoor ambient temperature is 40°C, the pressure adjustment coefficient is 1.05, and the rated pressure value is multiplied by the pressure adjustment coefficient to obtain a first product value, and the first product value is used as the fluorine deficiency pressure value. In this application, the rated pressure value is adjusted by the pressure adjustment coefficient to obtain the fluorine deficiency pressure value, so that the fluorine deficiency detection of the air conditioner is realized by the fluorine deficiency pressure value, which greatly improves the accuracy of the fluorine deficiency detection and avoids misjudgment of fluorine deficiency.

[0061] In some embodiments, for obtaining the fluorine-deficient current value based on the rated current value, the controller is specifically configured to: obtain the outdoor ambient temperature; obtain the current adjustment coefficient based on the outdoor ambient temperature; multiply the rated current value by the current adjustment coefficient to obtain a second product value, and use the second product value as the fluorine-deficient current value.

[0062] Specifically, since the outdoor ambient temperature during the operation of the air conditioner will affect the rated current value, the rated current value is adjusted by the current adjustment coefficient in the present application to obtain the fluorine deficiency current value, thereby realizing the fluorine deficiency detection of the air conditioner through the fluorine deficiency current value, which greatly improves the accuracy of fluorine deficiency detection and avoids misjudgment of fluorine deficiency. That is to say, the outdoor ambient temperature and the current adjustment coefficient are in a one-to-one correspondence in the controller, so the controller obtains the outdoor ambient temperature detected by the temperature sensor, and queries the corresponding current adjustment coefficient through the detected outdoor ambient temperature. For example, Figure 8 As shown, if the outdoor ambient temperature is 40°C, the current adjustment coefficient is 1.1, and the rated current value is multiplied by the current adjustment coefficient to obtain a second product value, and the first product value is used as the fluorine deficiency current value. Therefore, in this application, the rated current value is adjusted by the current adjustment coefficient to obtain the fluorine deficiency current value, so that the air conditioner fluorine deficiency detection is realized by the fluorine deficiency current value, which greatly improves the accuracy of fluorine deficiency detection and avoids misjudgment of fluorine deficiency.

[0063] In some embodiments, the fluorine deficiency degree of the air conditioner is detected by measuring the ratio of the fluorine deficiency pressure value, the rated pressure value and the pipeline pressure value, or the ratio of the fluorine deficiency pressure value, the rated current value and the actual operating current. For example, if the ratio of the rated pressure value to the pipeline pressure value or the ratio of the rated current value to the actual operating current is 50%, then when the pipeline pressure value is lower than the fluorine deficiency pressure value*50%, and the actual operating current is lower than the fluorine deficiency current value*50%, it is determined that the fluorine deficiency degree of the air conditioner is medium. In addition, the fluorine deficiency degree can also be divided into different degrees according to the ratio, which is not limited.

[0064] In addition, when the amount of refrigerant is 20% of the normal amount and the air conditioner cannot be operated, it can effectively protect the refrigeration system and prompt a fluorine deficiency fault.

[0065] In some embodiments, the controller is further configured as follows: the controller obtains the outdoor ambient temperature collected by relevant sensors and the current temperature value of the outdoor heat exchanger, and then calculates the absolute temperature difference between the outdoor ambient temperature and the current temperature value, and determines the fluorine deficiency state of the air conditioner according to the absolute temperature difference, that is, determines whether the absolute temperature difference is lower than the preset temperature absolute difference calibrated according to the air conditioner being in the fluorine deficiency state, wherein the preset temperature absolute difference may be 2°C, and if so, at this time, since the difference between the outdoor ambient temperature and the current temperature value is small, it is determined that the air conditioner is in the fluorine deficiency state, otherwise, it is determined that the air conditioner is not in the fluorine deficiency state; or because when the air conditioner is lacking fluorine, the refrigerant flow rate inhaled and discharged by the compressor is very small, so that the exhaust superheat increases, thereby The exhaust superheat determines the fluorine deficiency state of the air conditioner. That is to say, the indoor and outdoor of the air conditioner with 24V communication only have switch signals but no code signals, so the indoor unit cannot send parameters and operating status to the outdoor unit. Therefore, the controller calculates the refrigerant saturation temperature through the pipeline pressure value at the four-way valve detected by the pressure sensor, obtains the exhaust superheat through the refrigerant saturation temperature calculation, and then determines the fluorine deficiency state of the air conditioner through the exhaust superheat, that is, by judging whether the exhaust superheat is greater than the preset exhaust superheat calibrated according to the air conditioner being in a fluorine deficiency state, where the preset exhaust superheat can be 45. If the exhaust superheat is greater than the preset exhaust superheat, it is determined that the air conditioner is in a fluorine deficiency state, otherwise, it is determined that the air conditioner is not in a fluorine deficiency state. Therefore, in this application, while detecting the fluorine deficiency of the air conditioner through the pipeline pressure value and the actual operating current, the exhaust superheat and the absolute temperature difference are used to detect the fluorine deficiency of the air conditioner, thereby improving the accuracy of fluorine deficiency detection and effectively protecting the refrigeration system.

[0066] In an embodiment, if the air conditioner is identified as lacking fluorine for a preset number of times through the pipeline pressure value, actual operating current, temperature absolute difference or exhaust superheat within a preset time such as 0.5h, and lasts for a certain time such as 3min, then the lack of fluorine in the air conditioner is reported and the air conditioner is shut down for protection. Otherwise, the lack of fluorine in the air conditioner is not reported, the air conditioner is not shut down for protection, the compressor runs at a normal frequency, and the number of times the air conditioner is identified as lacking fluorine is cleared. This avoids the situation of false reporting of the lack of fluorine fault.

[0067] In the embodiment, if the compressor is shut down for protection due to lack of fluorine, the compressor will not be restarted, and the air conditioner will be re-determined whether it is lack of fluorine after power is turned off, and the air conditioner will exit the fluorine deficiency determination when it receives a power on / off signal or is powered on again.

[0068] Reference below Fig. 9 The control process of the controller according to the embodiment of the present invention is illustrated by way of example, and the specific contents are as follows.

[0069] Step S13, start.

[0070] Step S14, after the compressor runs for a preset time, the pipeline pressure value and the actual operating current are detected.

[0071] Step S15, determining whether the pipeline pressure value is lower than the fluorine deficiency pressure value and whether the actual operating current is lower than the fluorine deficiency current value, if yes, execute step S17, otherwise execute step S16.

[0072] Step S16: the compressor operates at a normal frequency.

[0073] Step S17, at the same time, determine whether the absolute temperature difference reaches the preset absolute temperature difference, and determine whether the exhaust gas superheat reaches the preset exhaust gas superheat. If yes, execute step S18, otherwise execute step S16.

[0074] Step S18, determining whether the number of times the above parameters satisfying the above conditions appear within 0.5 hours reaches a preset number, if yes, execute step S19, otherwise execute step S16.

[0075] Step S19, reporting a fluorine deficiency fault and shutting down the compressor for protection.

[0076] Step S20, end.

[0077] A second aspect of the present invention provides a method for controlling an air conditioner, which is used in the air conditioner of the above embodiment. Fig.10 As shown, the method at least includes: step S1 to step S2.

[0078] Step S1, after determining that the operating time of the compressor reaches a preset time, the pipeline pressure value at the four-way valve and the actual operating current of the compressor are obtained.

[0079] Specifically, after the controller determines that the operating time of the compressor reaches a preset time, the pressure sensor is used to collect the pipeline pressure value at the four-way valve, and the current transformer is used to collect the actual operating current of the compressor to ensure accurate acquisition of the pipeline pressure value and the actual operating current.

[0080] Step S2, determining the fluorine deficiency state of the air conditioner according to whether the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition.

[0081] Specifically, the existing air conditioner detects whether the air conditioner is short of fluorine through the exhaust temperature value, coil temperature value or intake temperature value and other temperature values ​​collected by the temperature sensor. However, in the above-mentioned method of detecting short of fluorine, the temperature value changes very slowly during the operation of the air-conditioning system, and the temperature value is greatly affected by factors such as the environment, which leads to the problem of untimely detection of short of fluorine and misjudgment of short of fluorine. In order to solve this problem, in the present application, whether the air conditioner is in a short of fluorine state is determined by the pipeline pressure value and the actual operating current collected in real time, instead of determining whether the air conditioner is short of fluorine by the temperature value. Since the pipeline pressure value and the actual operating current are collected in real time, it is possible to detect in time whether the air conditioner is in a short of fluorine state, and the pipeline pressure value and the actual operating current can be misjudged. The actual operating current changes rapidly during the operation of the air-conditioning system and is less affected by environmental factors, thereby avoiding the problem of misjudgment of fluorine deficiency and improving the accuracy of fluorine deficiency detection. That is to say, a preset fluorine deficiency condition for detecting whether the air conditioner is lacking fluorine is pre-stored in the controller, and the fluorine deficiency state of the air conditioner is determined by comparing the pipeline pressure value and the actual operating current with the preset fluorine deficiency condition. For example, the preset fluorine deficiency condition is the pipeline pressure value and operating current corresponding to the fluorine deficiency state of the air conditioner. If the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition, it is determined that the air conditioner is in a fluorine deficiency state. Conversely, if the pipeline pressure value and the actual operating current do not meet the preset fluorine deficiency condition, it is determined that the air conditioner is not in a fluorine deficiency state. Therefore, compared with the method of detecting whether the air conditioner is lacking fluorine by temperature value, the present application determines whether the air conditioner is in a state of lacking fluorine by the real-time collected pipeline pressure value and actual operating current, instead of judging whether the air conditioner is lacking fluorine by temperature value. Since the pipeline pressure value and the actual operating current are collected in real time, it is possible to detect in time whether the air conditioner is in a state of lacking fluorine, and the pipeline pressure value and the actual operating current change rapidly during the operation of the air-conditioning system and are less affected by environmental factors, thereby avoiding the problem of misjudgment of fluorine deficiency, improving the accuracy of fluorine deficiency detection, effectively ensuring the cooling and heating effects, and avoiding damage to the compressor.

[0082] According to the control method of the air conditioner in the embodiment of the present invention, the fluorine deficiency state of the air conditioner is detected by comparing the pipeline pressure value and the actual operating current collected in real time with the preset fluorine deficiency condition. If the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition, it is determined that the air conditioner is in a fluorine deficiency state. Therefore, compared with the method of detecting fluorine deficiency in the air conditioner by temperature value, in the present application, whether the air conditioner is in a fluorine deficiency state is judged by the pipeline pressure value and the actual operating current collected in real time, instead of judging whether the air conditioner is fluorine deficiency by temperature value, so that the fluorine deficiency of the air conditioner can be detected in time, the problem of misjudgment of fluorine deficiency is avoided, and the accuracy of fluorine deficiency detection is improved.

[0083] In some embodiments, the fluorine deficiency state of the air conditioner is determined based on whether the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition, including: obtaining the rated pressure value and the rated current value; obtaining the fluorine deficiency pressure value based on the rated pressure value; obtaining the fluorine deficiency current value based on the rated current value; if the pipeline pressure value is lower than the fluorine deficiency pressure value and the actual operating current is lower than the fluorine deficiency current value, it is determined that the air conditioner is in a fluorine deficiency state; if the pipeline pressure value is higher than the fluorine deficiency pressure value, or the actual operating current is higher than the fluorine deficiency current value, it is determined that the air conditioner is not in a fluorine deficiency state.

[0084] Specifically, the existing air conditioner detects whether the air conditioner is short of fluorine through the exhaust temperature value, coil temperature value or intake temperature value and other temperature values ​​collected by the temperature sensor. However, in the above-mentioned method of detecting fluorine deficiency, the temperature value changes very slowly during the operation of the air-conditioning system, and the temperature value is greatly affected by factors such as the environment, which leads to the problem of untimely detection of fluorine deficiency and misjudgment of fluorine deficiency. In order to solve this problem, in the present application, it is determined whether the air conditioner is in a fluorine deficiency state by judging whether the pipeline pressure value is lower than the fluorine deficiency pressure value and whether the actual operating current is lower than the fluorine deficiency current value, so that the air conditioner can be detected in time if the air conditioner is short of fluorine, the problem of misjudgment of fluorine deficiency is avoided, and the accuracy of fluorine deficiency detection is improved. That is to say, when the air conditioner is short of fluorine, the pipeline pressure value is reduced, so that the load of the compressor is reduced, thereby causing the compressor to The operating current is reduced, so in this application, the air conditioner fluorine deficiency detection is realized by the pipeline pressure value and the actual operating current, that is, the controller obtains the rated pressure value of the four-way valve and the rated current value of the compressor, wherein the rated pressure value and the rated current value are the rated pressure value and the rated current value calibrated when the air conditioner fluorine quantity is normally operating, and then the fluorine deficiency pressure value is calculated according to the rated pressure value, and then the fluorine deficiency current value is calculated according to the rated current value. If the pipeline pressure value is lower than the fluorine deficiency pressure value and the actual operating current is lower than the fluorine deficiency current value, it means that the pipeline pressure value and the actual operating current of the air conditioner are reduced due to fluorine deficiency, and it is determined that the air conditioner is in a fluorine deficiency state. If the pipeline pressure value is higher than the fluorine deficiency pressure value and / or the actual operating current is higher than the fluorine deficiency current value, it means that the fluorine quantity of the air conditioner is normal, and it is determined that the air conditioner is in a non-fluorine deficiency state. Therefore, in this application, by simultaneously judging whether the air conditioner is fluorine deficient by the pipeline pressure value and the actual operating current, it can detect the air conditioner fluorine deficiency in time, avoid the problem of misjudgment of fluorine deficiency, and improve the accuracy of fluorine deficiency detection.

[0085] In some embodiments, obtaining a fluorine-deficient pressure value according to a rated pressure value includes: obtaining an outdoor ambient temperature; obtaining a pressure adjustment coefficient according to the outdoor ambient temperature; multiplying the rated pressure value by the pressure adjustment coefficient to obtain a first product value, and using the first product value as the fluorine-deficient pressure value.

[0086] Specifically, since the outdoor ambient temperature during the operation of the air conditioner will affect the rated pressure value, the rated pressure value is adjusted by the pressure adjustment coefficient in the present application to obtain the fluorine deficiency pressure value, thereby realizing the fluorine deficiency detection of the air conditioner through the fluorine deficiency pressure value, which greatly improves the accuracy of fluorine deficiency detection and avoids misjudgment of fluorine deficiency. That is to say, the outdoor ambient temperature and the pressure adjustment coefficient are in a one-to-one correspondence in the controller, so the controller obtains the outdoor ambient temperature detected in real time by the temperature sensor, and queries the corresponding pressure adjustment coefficient through the outdoor ambient temperature detected in real time. For example, Figure 7 As shown, if the outdoor ambient temperature is 40°C, the pressure adjustment coefficient is 1.05, and the rated pressure value is multiplied by the pressure adjustment coefficient to obtain a first product value, and the first product value is used as the fluorine deficiency pressure value. For example, when the rated pressure value is 0.98MPa at the current operating frequency of 20HZ, the first product value, i.e., the fluorine deficiency pressure value, is 1.029MPa. In this application, the rated pressure value is adjusted by the pressure adjustment coefficient to obtain the fluorine deficiency pressure value, so that the fluorine deficiency detection of the air conditioner is realized by the fluorine deficiency pressure value, which greatly improves the accuracy of the fluorine deficiency detection and avoids misjudgment of fluorine deficiency.

[0087] In some embodiments, obtaining a fluorine-deficient current value according to a rated current value includes: obtaining an outdoor ambient temperature; obtaining a current adjustment coefficient according to the outdoor ambient temperature; multiplying the rated current value by the current adjustment coefficient to obtain a second product value, and using the second product value as the fluorine-deficient current value.

[0088] Specifically, since the outdoor ambient temperature during the operation of the air conditioner will affect the rated current value, the rated current value is adjusted by the current adjustment coefficient in the present application to obtain the fluorine deficiency current value, thereby realizing the fluorine deficiency detection of the air conditioner through the fluorine deficiency current value, which greatly improves the accuracy of fluorine deficiency detection and avoids misjudgment of fluorine deficiency. That is to say, the outdoor ambient temperature and the current adjustment coefficient are in a one-to-one correspondence in the controller, so the controller obtains the outdoor ambient temperature detected in real time by the temperature sensor, and queries the corresponding current adjustment coefficient through the outdoor ambient temperature detected in real time. For example, Figure 8 As shown, if the outdoor ambient temperature is 40°C, the current adjustment coefficient is 1.1, and the rated current value is multiplied by the current adjustment coefficient to obtain a second product value, and the first product value is used as the fluorine deficiency current value. For example, when the rated current value is 7A at the current operating frequency of 20HZ, the second product value, i.e., the fluorine deficiency current value, is 7.7A. Therefore, in this application, the rated current value is adjusted by the current adjustment coefficient to obtain the fluorine deficiency current value, so as to realize the fluorine deficiency detection of the air conditioner by the fluorine deficiency current value, which greatly improves the accuracy of the fluorine deficiency detection and avoids misjudgment of fluorine deficiency.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0090] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: An outdoor unit and an indoor unit, wherein the outdoor unit communicates with the indoor unit via a 24V communication mode; The refrigerant circulation loop allows the refrigerant to circulate in a loop consisting of a compressor, an outdoor heat exchanger, a throttling device, an indoor heat exchanger and a four-way valve; A pressure sensor, used to collect the pipeline pressure value at the four-way valve; A current transformer, used for collecting the actual operating current of the compressor; A controller, wherein the controller is connected to the pressure sensor and the current transformer, and the controller is configured as follows: After determining that the operating time of the compressor reaches a preset time, obtaining the pipeline pressure value and the actual operating current; The fluorine deficiency state of the air conditioner is determined according to whether the pipeline pressure value and the actual operating current meet a preset fluorine deficiency condition.

2. The air conditioner according to claim 1, characterized in that: Regarding determining the fluorine deficiency state of the air conditioner according to whether the pipeline pressure value and the actual operating current meet a preset fluorine deficiency condition, the controller is specifically configured as follows: Obtain the rated pressure value and the rated current value; Acquire a fluorine-deficient pressure value according to the rated pressure value; Obtaining a fluorine-deficient current value according to the rated current value; If the pipeline pressure value is lower than the fluorine deficiency pressure value and the actual operating current is lower than the fluorine deficiency current value, it is determined that the air conditioner is in a fluorine deficiency state; If the pipeline pressure value is higher than the fluorine deficiency pressure value and / or the actual operating current is higher than the fluorine deficiency current value, it is determined that the air conditioner is in a non-fluorine deficiency state.

3. The air conditioner according to claim 2, characterized in that: For obtaining the rated pressure value and the rated current value, the controller is specifically configured as follows: Obtaining the current operating frequency of the compressor; The rated pressure value and the rated current value are acquired according to the current operating frequency.

4. The air conditioner according to claim 2, characterized in that: For obtaining the fluorine deficiency pressure value according to the rated pressure value, the controller is specifically configured as follows: Get the outdoor ambient temperature; Obtaining a pressure adjustment coefficient according to the outdoor ambient temperature; The rated pressure value is multiplied by the pressure adjustment coefficient to obtain a first product value, and the first product value is used as the fluorine deficiency pressure value.

5. The air conditioner according to claim 2, characterized in that: For obtaining the fluorine deficiency current value according to the rated current value, the controller is specifically configured as follows: Get the outdoor ambient temperature; Obtaining a current regulation coefficient according to the outdoor ambient temperature; The rated current value is multiplied by the current adjustment coefficient to obtain a second product value, and the second product value is used as the fluorine-deficient current value.

6. The air conditioner according to claim 1, characterized in that: The controller is also configured to: Acquire the outdoor ambient temperature and the current temperature value of the outdoor heat exchanger; Obtaining an absolute temperature difference according to the outdoor ambient temperature and the current temperature value; Obtain exhaust gas superheat; The fluorine deficiency state of the air conditioner is determined according to the absolute temperature difference or the exhaust gas superheat degree.

7. A method for controlling an air conditioner, characterized in that: The air conditioner according to any one of claims 1 to 6, comprising: After determining that the running time of the compressor reaches a preset time, obtaining the pipeline pressure value at the four-way valve and the actual running current of the compressor; The fluorine deficiency state of the air conditioner is determined according to whether the pipeline pressure value and the actual operating current meet a preset fluorine deficiency condition.

8. The control method of the air conditioner according to claim 7, determining the fluorine deficiency state of the air conditioner according to whether the pipeline pressure value and the actual operating current meet the preset fluorine deficiency condition, comprising: Obtain the rated pressure value and the rated current value; Acquire a fluorine-deficient pressure value according to the rated pressure value; Obtaining a fluorine-deficient current value according to the rated current value; If the pipeline pressure value is lower than the fluorine deficiency pressure value and the actual operating current is lower than the fluorine deficiency current value, it is determined that the air conditioner is in a fluorine deficiency state; If the pipeline pressure value is higher than the fluorine deficiency pressure value, or the actual operating current is higher than the fluorine deficiency current value, it is determined that the air conditioner is in a non-fluorine deficiency state.

9. The air conditioner control method according to claim 8, characterized in that: Obtaining a fluorine-deficient pressure value according to the rated pressure value includes: Get the outdoor ambient temperature; Obtaining a pressure adjustment coefficient according to the outdoor ambient temperature; The rated pressure value is multiplied by the pressure adjustment coefficient to obtain a first product value, and the first product value is used as the fluorine deficiency pressure value.

10. The air conditioner control method according to claim 8, characterized in that: Obtaining a fluorine-deficient current value according to the rated current value includes: Get the outdoor ambient temperature; Obtaining a current regulation coefficient according to the outdoor ambient temperature; The rated current value is multiplied by the current adjustment coefficient to obtain a second product value, and the second product value is used as the fluorine-deficient current value.

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