Method and device for controlling a multi-split air conditioner, and multi-split air conditioner

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a method for controlling a multi-connected air conditioner, which comprises the following steps: in the case that an indoor unit of the multi-connected air conditioner is operated at a first preset valve opening degree for heating for a first time length, acquiring a first liquid pipe temperature and a first gas pipe temperature of the indoor unit; calculating a first temperature difference value ΔT1=T 气1 -T 液1 ; according to the first temperature difference value, determining a plugging condition of a gas pipe temperature sensor and a liquid pipe temperature sensor of the indoor unit; and according to the plugging condition, controlling the operation of the indoor unit; wherein T 气1 is the first gas pipe temperature detected by the gas pipe temperature sensor, and T 液1 is the first liquid pipe temperature detected by the liquid pipe temperature sensor. The method can check the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit of the multi-connected air conditioner, automatically controls the operation of the indoor unit according to the checking condition, and reduces the checking and debugging cost. The application further discloses a device for controlling the multi-connected air conditioner and the multi-connected air conditioner.

Description

Technical Field

[0001] This application relates to the field of smart home appliance technology, such as a method and apparatus for controlling a multi-split air conditioner, and a multi-split air conditioner. Background Technology

[0002] With economic development, air conditioning products have seen a significant expansion in various fields. Multi-split air conditioning systems are a common type of air conditioning product, widely used in shopping malls, offices, and other similar settings. Multi-split air conditioning systems have a large number of indoor units, making the entire system complex. One of the most common problems is that the gas pipe temperature sensors and liquid pipe temperature sensors in many indoor units are difficult to distinguish due to their similar appearance, often resulting in the gas pipe temperature sensors and liquid pipe temperature sensors being inserted in reverse. When the gas pipe temperature sensors and liquid pipe temperature sensors are inserted in reverse, it can cause the electronic expansion valve control of the indoor unit to malfunction, resulting in poor cooling and heating performance. More seriously, it can lead to malfunctions such as liquid return and compression damage to the compressor, causing the entire air conditioning system to malfunction and fail to operate normally.

[0003] The related technology discloses a method for inspecting multi-split air conditioners, including: manually inspecting the gas pipe temperature sensor and liquid pipe temperature sensor of each indoor unit, and manually adjusting any incorrectly connected temperature sensors.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] While this technology can correct incorrect connections of the gas and liquid temperature sensors, manual inspection is time-consuming and labor-intensive due to the large number of indoor units in multi-split air conditioning systems. Therefore, the inspection and troubleshooting costs are high.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a method and apparatus for controlling a multi-split air conditioner, which can check the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit of the multi-split air conditioner, and control the operation of the indoor unit according to the check results, thereby reducing the inspection and debugging costs.

[0009] In some embodiments, a method for controlling a multi-split air conditioner includes: when the indoor unit of the multi-split air conditioner is operating in heating mode at a first preset valve opening for a first duration, acquiring a first liquid pipe temperature and a first gas pipe temperature of the indoor unit; and calculating a first temperature difference ΔT1 = T. 气1 -T 液1 Based on the first temperature difference, determine the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit; control the operation of the indoor unit according to the connection status; where T 气1 The first tracheal temperature detected by the tracheal temperature sensor, T 液1 The temperature of the first liquid tube detected by the liquid tube temperature sensor.

[0010] Optionally, determining the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit based on the first temperature difference includes: if the first temperature difference is greater than or equal to a first temperature difference threshold, determining that the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit is correct; if the first temperature difference is less than or equal to a second temperature difference threshold, determining that the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit is incorrect; wherein, the first temperature difference threshold is greater than the second temperature difference threshold.

[0011] Optionally, the connection status includes correct or incorrect connection; based on the connection status, the operation of the indoor unit is controlled, including: if the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit is correct, based on the first detected temperature difference ΔT 1检 =T 气检 -T 液检 Control the operation of the indoor unit; if the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit are incorrectly connected, the second detected temperature difference ΔT will be used. 2检 =T 液检 -T 气检 Control the operation of the indoor unit; among which, T 气检 The temperature value detected by the tracheal temperature sensor, T 液检 This is the temperature value detected by the liquid tube temperature sensor.

[0012] Optionally, based on the first temperature difference, the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit is determined, including: after determining the first temperature difference, controlling the indoor unit to operate in cooling mode at a second preset valve opening; after the indoor unit has been operating in cooling mode for a second duration, acquiring the second liquid pipe temperature and the second gas pipe temperature of the indoor unit; and calculating the second temperature difference ΔT2 = T. 气2 -T 液2 Based on the first temperature difference and the second temperature difference, determine the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit; where T 气2The second tracheal temperature, T, is detected by the tracheal temperature sensor. 液2 The temperature of the second liquid tube is detected by the liquid tube temperature sensor.

[0013] Optionally, the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit is determined based on the first temperature difference and the second temperature difference, including: if the first temperature difference is greater than or equal to a first temperature difference threshold and the second temperature difference is greater than or equal to a third temperature difference threshold, the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit is determined to be correct; if the first temperature difference is less than or equal to the second temperature difference threshold and the second temperature difference is less than or equal to a fourth temperature difference threshold, the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit is determined to be incorrect. Wherein, the third temperature difference threshold is greater than the fourth temperature difference threshold.

[0014] Optionally, the above method further includes: reducing the opening degree of the electronic expansion valve of the indoor unit when the first temperature difference is greater than or equal to the first temperature difference threshold and the second temperature difference is less than the third temperature difference threshold; and / or reducing the opening degree of the electronic expansion valve when the first temperature difference is less than or equal to the second temperature difference threshold and the second temperature difference is greater than the fourth temperature difference threshold.

[0015] Optionally, the above method further includes: before the indoor unit operates in heating mode at the first preset valve opening for a first duration, controlling the indoor unit to operate in air supply mode at the fifth preset valve opening; after the indoor unit operates in air supply mode for a third duration, detecting the temperature of the third liquid pipe and the temperature of the third gas pipe of the indoor unit; correcting the temperature value detected by the liquid pipe temperature sensor of the indoor unit based on the temperature of the third liquid pipe; and correcting the temperature value detected by the gas pipe temperature sensor of the indoor unit based on the temperature of the third gas pipe.

[0016] Optionally, based on the temperature of the third liquid pipe, the temperature value detected by the liquid pipe temperature sensor of the indoor unit is corrected, including: calculating the average liquid pipe temperature of all third liquid pipe temperatures; calculating the third temperature difference ΔT3 = T 液3 -T 液平 If the third temperature difference exceeds the first value range, correct the temperature value detected by the liquid pipe temperature sensor of the indoor unit; where T 液3 The temperature of the third liquid tube, T, is detected by the liquid tube temperature sensor. 液平 The average temperature of the liquid pipe; and / or, based on the third gas pipe temperature, correcting the temperature value detected by the gas pipe temperature sensor of the indoor unit, including: calculating the average gas pipe temperature of all third gas pipe temperatures; calculating the fourth temperature difference ΔT4 = T 气3 -T 气平 If the fourth temperature difference value exceeds the second value range, correct the temperature value detected by the gas pipe temperature sensor of the indoor unit; where T 气3The third tracheal temperature, T, is detected by the tracheal temperature sensor. 气平 This represents the average temperature of the trachea.

[0017] In some embodiments, the apparatus for controlling a multi-split air conditioner includes a processor and a memory storing program instructions, the processor being configured to execute the method for controlling the multi-split air conditioner described above when the program instructions are executed.

[0018] In some embodiments, the multi-split air conditioner includes a multi-split air conditioner body; and the aforementioned device for controlling the multi-split air conditioner is installed on the multi-split air conditioner body.

[0019] The method and apparatus for controlling multi-split air conditioners, and the multi-split air conditioner provided in this disclosure, can achieve the following technical effects:

[0020] During heating operation, if the gas pipe temperature sensor and liquid pipe temperature sensor are correctly connected, the temperature value detected by the gas pipe temperature sensor will be higher than that detected by the liquid pipe temperature sensor. If the gas pipe temperature sensor and liquid pipe temperature sensor are reversed, the temperature value detected by the liquid pipe temperature sensor will be higher than that detected by the gas pipe temperature sensor. Therefore, the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor in the corresponding indoor unit can be determined based on the first temperature difference. Based on the connection status, the operation of the multi-split air conditioner indoor unit can be controlled. Compared with related technologies, this method allows for the inspection of the gas pipe temperature sensor and liquid pipe temperature sensor in the multi-split air conditioner indoor unit, and automatic control of the indoor unit operation based on the inspection results, reducing inspection and debugging costs.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a schematic diagram of a multi-split air conditioner provided in an embodiment of this disclosure;

[0024] Figure 2 This is a schematic diagram of a method for controlling a multi-split air conditioner provided in an embodiment of this disclosure;

[0025] Figure 3 This is a schematic diagram of another method for controlling a multi-split air conditioner provided in an embodiment of this disclosure;

[0026] Figure 4This is a schematic diagram of another method for controlling a multi-split air conditioner provided in an embodiment of this disclosure;

[0027] Figure 5 This is a schematic diagram of another method for controlling a multi-split air conditioner provided in an embodiment of this disclosure;

[0028] Figure 6 This is a schematic diagram of a device for controlling a multi-split air conditioner provided in an embodiment of this disclosure.

[0029] Figure label:

[0030] 10: Outdoor unit; 11: Main electronic expansion valve; 12: Check valve; 13: Outdoor heat exchanger; 14: Four-way valve; 15: Compressor; 16: Distributor; 20: Indoor unit; 21: Electronic expansion valve; 22: Indoor heat exchanger; 23: Liquid pipe temperature sensor; 24: Gas pipe temperature sensor; 300: Device for controlling multi-split air conditioners; 100: Processor; 101: Memory; 102: Communication interface; 103: Bus. Detailed Implementation

[0031] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0032] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0033] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0034] Unless otherwise stated, the term "multiple" means two or more.

[0035] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0036] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0037] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0038] In addition, the term "settings" should be interpreted broadly.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0040] like Figure 1 As shown, this disclosure provides a multi-split air conditioner, including an outdoor unit 10, multiple indoor units 20, and a processor. Each indoor unit 20 includes an electronic expansion valve 21, an indoor heat exchanger 22, a liquid line temperature sensor 23, and a gas line temperature sensor 24. The outdoor unit 10 includes a main electronic expansion valve 11, a one-way valve 12, an outdoor heat exchanger 13, a four-way valve 14, a compressor 15, and a distributor 16. The processor can control the operation of the outdoor unit 10 and the multiple indoor units 20.

[0041] In conjunction with the above-described multi-split air conditioner, this disclosure provides a method for controlling a multi-split air conditioner. For example... Figure 2 As shown, the method includes:

[0042] S201, when the indoor unit of the multi-split air conditioner is running in heating mode at the first preset valve opening for a first duration, the processor obtains the first liquid pipe temperature and the first gas pipe temperature of the indoor unit.

[0043] Preferably, the range of the first preset valve opening degree is [300 steps, 350 steps]. Within this opening range, the air conditioner operates stably, and the first liquid pipe temperature and first gas pipe temperature exhibited by each indoor unit are stable. Preferably, the range of the first duration is [5 minutes, 8 minutes]. Running for the first duration can stabilize the operation of each indoor unit. The indoor units for heating operation mentioned above can be some or all of the indoor units of a multi-split air conditioner. Each indoor unit corresponds to a first liquid pipe temperature and a first gas pipe temperature. The first liquid pipe temperature is the temperature value detected by the liquid pipe temperature sensor, and the first gas pipe temperature is the temperature value detected by the gas pipe temperature sensor. In actual installation, the liquid pipe temperature sensor of the indoor unit may be mistakenly installed in the gas pipe, and the gas pipe temperature sensor may be mistakenly installed in the liquid pipe. In the case of installation errors, the temperature value detected by the liquid pipe temperature sensor is the gas pipe temperature, and the temperature value detected by the gas pipe temperature sensor is the liquid pipe temperature. During the heating operation of each indoor unit, the indoor fan can operate at a high speed. This allows the heat exchanger to maintain high heat exchange efficiency, with a large temperature difference between the liquid tube and the gas tube.

[0044] S202, The processor calculates the first temperature difference ΔT1 = T 气1 -T 液1 Among them, T 气1 The first tracheal temperature detected by the tracheal temperature sensor, T 液1 The temperature of the first liquid tube detected by the liquid tube temperature sensor.

[0045] It's important to note that the "first tracheal temperature" here is not the actual tracheal temperature, but rather the temperature value detected by the tracheal temperature sensor. Similarly, the "first liquid tube temperature" is not the actual liquid tube temperature, but rather the temperature value detected by the liquid tube temperature sensor. For example, if the first tracheal temperature is 60℃ and the first liquid tube temperature is 40℃, then the first temperature difference is 60℃ - 40℃ = 20℃. Conversely, if the first tracheal temperature is 40℃ and the first liquid tube temperature is 60℃, then the first temperature difference is 40℃ - 60℃ = -20℃.

[0046] S203, the processor determines the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit based on the first temperature difference value.

[0047] Assuming the gas pipe temperature sensor and liquid pipe temperature sensor are correctly connected, during the indoor unit's heating operation, the temperature value measured by the gas pipe temperature sensor will always be higher than the temperature value measured by the liquid pipe temperature sensor. Therefore, based on the first temperature difference of each indoor unit, the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor for that indoor unit can be determined.

[0048] S204, the processor controls the operation of the indoor unit according to the plug-in status.

[0049] In this embodiment, during the heating operation of the indoor unit of a multi-split air conditioner, if the gas pipe temperature sensor and the liquid pipe temperature sensor are correctly connected, the temperature value detected by the gas pipe temperature sensor is greater than the temperature value detected by the liquid pipe temperature sensor. If the gas pipe temperature sensor and the liquid pipe temperature sensor are reversed, the temperature value detected by the liquid pipe temperature sensor will be greater than the temperature value detected by the gas pipe temperature sensor. Therefore, the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the corresponding indoor unit can be determined based on the first temperature difference. Based on the connection status, the operation control of the multi-split air conditioner can be performed. Compared with related technologies, this method allows for the inspection of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit of the multi-split air conditioner, and automatic control of the indoor unit's operation based on the inspection results, reducing inspection and debugging costs. Furthermore, during the heating operation of the indoor unit, the temperature difference between the liquid pipe and the gas pipe is even greater. Thus, even if the detection accuracy of the liquid pipe temperature sensor and the gas pipe temperature sensor is poor, the detection result will be more accurate. This improves the accuracy of detection and control.

[0050] Optionally, the processor determines the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit based on the first temperature difference, including: if the first temperature difference is greater than or equal to a first temperature difference threshold, the processor determines that the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit is correct. If the first temperature difference is less than or equal to a second temperature difference threshold, the processor determines that the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit is incorrect. The first temperature difference threshold is greater than the second temperature difference threshold. The range of the first temperature difference threshold is [3, 10]. Optionally, the first temperature difference threshold is 4, 6, or 8. The range of the second temperature difference threshold is [-3, -10]. Optionally, the second temperature difference threshold is -3, -6, or -8. Under normal operation of a multi-split air conditioner, the difference between the gas pipe temperature and the liquid pipe temperature is relatively large. If the temperature difference between the gas pipe and liquid pipe is small, it may be due to a malfunction in the temperature sensor or poor heat exchange performance of the air conditioner due to dirt or blockage. In this case, an alarm can be triggered. By comparing the first temperature difference with a first temperature difference threshold and a second temperature difference threshold, false alarms can be reduced. This improves the accuracy of determining the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor.

[0051] Optionally, the connection status includes correct or incorrect connection. The processor controls the operation of the indoor unit based on the connection status, including: if the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit are correctly connected, the processor controls the operation based on the first detected temperature difference ΔT. 1检 =T 气检 -T 液检 Controls the operation of the indoor unit. If the gas pipe temperature sensor and liquid pipe temperature sensor on the indoor unit are incorrectly connected, the processor will determine the operation based on the second detected temperature difference value ΔT. 2检 =T 液检 -T 气检 Control the operation of the indoor unit. Among them, T... 气检 The temperature value detected by the tracheal temperature sensor, T 液检This refers to the temperature value detected by the liquid line temperature sensor. Under normal circumstances, the opening of the electronic expansion valve is controlled based on the superheat. By controlling the opening of the electronic expansion valve, the superheat is maximized to reach the target superheat, thereby making the entire air conditioning system more stable and energy-efficient. The superheat is obtained by subtracting the liquid line temperature from the gas line temperature. If the gas line temperature sensor and the liquid line temperature sensor on the indoor unit are incorrectly connected, the temperature value measured by the gas line temperature sensor will be the liquid line temperature, and the temperature value measured by the liquid line temperature sensor will be the gas line temperature. In this case, if the indoor unit is still controlled by subtracting the temperature value measured by the liquid line temperature sensor from the gas line temperature sensor, the electronic expansion valve will fail, and the system will not function properly. Therefore, controlling the indoor unit's operation based on the connection status improves the reliability of the air conditioning system.

[0052] Optionally, the processor determines the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit based on the first temperature difference, including: after determining the first temperature difference, the processor controls the indoor unit to operate in cooling mode at a second preset valve opening. After the indoor unit has been operating in cooling mode for a second duration, the processor acquires the second liquid pipe temperature and the second gas pipe temperature of the indoor unit. The processor calculates the second temperature difference ΔT2 = T 气2 -T 液2 The processor determines the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor in the indoor unit based on the first temperature difference and the second temperature difference. Wherein, T... 气2 The second tracheal temperature, T, is detected by the tracheal temperature sensor. 液2 The second liquid pipe temperature is detected by the liquid pipe temperature sensor. Preferably, the second preset valve opening range is [220 steps, 260 steps]. Within this opening range, the air conditioner operates stably, and the second liquid pipe temperature and second gas pipe temperature exhibited by each indoor unit are stable. Preferably, the second duration range is [5 minutes, 8 minutes]. Running for the second duration can stabilize the operation of each indoor unit. The second liquid pipe temperature is the temperature value detected by the liquid pipe temperature sensor, and the second gas pipe temperature is the temperature value detected by the gas pipe temperature sensor. In actual installation, the liquid pipe temperature sensor of the indoor unit may be mistakenly installed in the gas pipe, and the gas pipe temperature sensor may be mistakenly installed in the liquid pipe. In the case of installation errors, the temperature value detected by the liquid pipe temperature sensor is the gas pipe temperature, and the temperature value detected by the gas pipe temperature sensor is the liquid pipe temperature. During the cooling operation of each indoor unit, the indoor fan can run at a high speed. This allows the heat exchanger to maintain a high heat exchange efficiency, resulting in a larger temperature difference between the liquid pipe temperature and the gas pipe temperature. By using the first temperature difference under heating operation and the second temperature difference under cooling operation to determine the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor in the indoor unit, false alarms can be reduced. This improves the accuracy of detection and control.

[0053] Combination Figure 3 As shown in the embodiments of this disclosure, another method for controlling a multi-split air conditioner is provided, including:

[0054] S301, when the indoor unit of the multi-split air conditioner is running in heating mode at the first preset valve opening for a first duration, the processor obtains the first liquid pipe temperature and the first gas pipe temperature of the indoor unit.

[0055] S302, The processor calculates the first temperature difference ΔT1 = T 气1 -T 液1 Among them, T 气1 The first tracheal temperature detected by the tracheal temperature sensor, T 液1 The temperature of the first liquid tube detected by the liquid tube temperature sensor.

[0056] S303, after determining the first temperature difference, the processor controls the indoor unit to operate at the second preset valve opening for cooling.

[0057] S304, after the indoor unit has been running in cooling mode for the second time, the processor obtains the temperature of the second liquid pipe and the second gas pipe of the indoor unit.

[0058] S305, the processor calculates the second temperature difference ΔT2 = T 气2 -T 液2 Among them, T 气2 The second tracheal temperature, T, is detected by the tracheal temperature sensor. 液2 The temperature of the second liquid tube is detected by the liquid tube temperature sensor.

[0059] S306, the processor determines the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit based on the first temperature difference and the second temperature difference.

[0060] The S307 processor controls the operation of the indoor unit based on the connection status.

[0061] In this embodiment, the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit is determined by jointly using a first temperature difference under heating operation and a second temperature difference under cooling operation, which can reduce false judgments and improve the accuracy of detection and control.

[0062] Optionally, the processor determines the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit based on the first temperature difference and the second temperature difference, including: if the first temperature difference is greater than or equal to a first temperature difference threshold and the second temperature difference is greater than or equal to a third temperature difference threshold, the processor determines that the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit is correct. If the first temperature difference is less than or equal to the second temperature difference threshold and the second temperature difference is less than or equal to a fourth temperature difference threshold, the processor determines that the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit is incorrect. The third temperature difference threshold is greater than the fourth temperature difference threshold. The first temperature difference threshold ranges from [3, 10]. Optionally, the first temperature difference threshold is 4, 6, or 8. The second temperature difference threshold ranges from [-3, -10]. Optionally, the second temperature difference threshold is -3, -6, or -8. The third temperature difference threshold ranges from [2, 8]. Optionally, the third temperature difference threshold is 3, 5, or 7. The fourth temperature difference threshold ranges from -2 to -8. Optionally, the fourth temperature difference threshold is -3, -5, or -7. Under normal operating conditions of a multi-split air conditioner, the temperature difference between the gas pipe and the liquid pipe is relatively large. By setting reasonable thresholds, the accuracy of detection and judgment can be improved.

[0063] Optionally, the above method further includes: when the first temperature difference is greater than or equal to a first temperature difference threshold and the second temperature difference is less than a third temperature difference threshold, the processor reduces the opening of the electronic expansion valve of the indoor unit. And / or, when the first temperature difference is less than or equal to a second temperature difference threshold and the second temperature difference is greater than a fourth temperature difference threshold, the processor reduces the opening of the electronic expansion valve. When reducing the opening of the electronic expansion valve, a preset valve opening can be reduced each time and the operation can be run for a preset duration. Preferably, the preset valve opening value range is [3 steps, 5 steps]. This ensures that the change in the opening of the electronic expansion valve is not too large, which could lead to unstable operation of the air conditioner, and also increases the temperature difference between the liquid pipe temperature and the gas pipe temperature of the indoor unit. Preferably, the preset duration value range is [10 min, 15 min]. Running for the preset duration can ensure that each indoor unit operates stably at the new electronic expansion valve opening, at which time the temperature value measured by the temperature sensor is more accurate. If the first temperature difference is greater than or equal to the first temperature difference threshold, it can be preliminarily determined that the connection of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit is correct. If, at this time, the second temperature difference is less than the third temperature difference threshold, it may be due to a malfunction of the temperature sensor or other components, making it impossible to accurately determine the connection of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit. If the first temperature difference is less than or equal to the second temperature difference threshold, it can be preliminarily determined that the connection of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit is incorrect. If, at this time, the second temperature difference is greater than the fourth temperature difference threshold, it may be due to a malfunction of the temperature sensor or other components, making it impossible to accurately determine the connection of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit. During cooling operation, reducing the opening of the electronic expansion valve can increase the temperature difference between the liquid pipe temperature and the gas pipe temperature of the indoor unit. When the air conditioning system is functioning correctly, the second temperature difference will change accordingly. By determining whether the changed temperature difference meets the following conditions: a first temperature difference greater than or equal to a first temperature difference threshold, and a second temperature difference greater than or equal to a third temperature difference threshold; or a first temperature difference less than or equal to a second temperature difference threshold, and a second temperature difference less than or equal to a fourth temperature difference threshold, if the conditions are not met, the opening of the indoor unit's electronic expansion valve is further reduced to a preset valve opening and operated for the corresponding duration. If the conditions are still not met even after the electronic expansion valve has been reduced to its minimum opening, an alarm is triggered. This improves the accuracy of detection and control in multi-split air conditioning systems.

[0064] Combination Figure 4 As shown in the embodiments of this disclosure, another method for controlling a multi-split air conditioner is provided, including:

[0065] S401, when the indoor unit of the multi-split air conditioner is running in heating mode at the first preset valve opening for a first duration, the processor obtains the first liquid pipe temperature and the first gas pipe temperature of the indoor unit.

[0066] S402, the processor calculates the first temperature difference ΔT1 = T 气1 -T 液1 Among them, T 气1 The first tracheal temperature detected by the tracheal temperature sensor, T 液1 The temperature of the first liquid tube detected by the liquid tube temperature sensor.

[0067] S403, after determining the first temperature difference, the processor controls the indoor unit to operate at the second preset valve opening for cooling.

[0068] S404, after the indoor unit has been running in cooling mode for the second time, the processor obtains the temperature of the second liquid pipe and the second gas pipe of the indoor unit.

[0069] S405, the processor calculates the second temperature difference ΔT2 = T 气2 -T 液2 Among them, T 气2 The second tracheal temperature, T, is detected by the tracheal temperature sensor. 液2 The temperature of the second liquid tube is detected by the liquid tube temperature sensor.

[0070] S406, the processor determines whether the first temperature difference is greater than or equal to the first temperature difference threshold. If yes, proceed to step S407; otherwise, proceed to step S408.

[0071] S407, the processor determines whether the second temperature difference is greater than or equal to the third temperature difference threshold. If yes, proceed to step S417; otherwise, proceed to step S410.

[0072] S408, the processor determines whether the first temperature difference is less than or equal to the second temperature difference threshold. If yes, proceed to step S409; otherwise, proceed to step S416.

[0073] S409, the processor determines whether the second temperature difference is less than or equal to the fourth temperature difference threshold. If yes, proceed to step S418; otherwise, proceed to step S413.

[0074] S410, the processor reduces the opening of the electronic expansion valve of the indoor unit.

[0075] S411, the processor determines whether the second temperature difference is greater than or equal to the third temperature difference threshold. If yes, proceed to step S417; otherwise, proceed to step S412.

[0076] S412, the processor determines whether the opening degree of the electronic expansion valve is the minimum opening degree. If yes, proceed to step S416; otherwise, return to step S410.

[0077] S413, the processor reduces the opening of the electronic expansion valve.

[0078] S414, the processor determines whether the second temperature difference is less than or equal to the fourth temperature difference threshold. If yes, proceed to step S418; otherwise, proceed to step S415.

[0079] S415, the processor determines whether the opening degree of the electronic expansion valve is the minimum opening degree. If yes, proceed to step S416; otherwise, return to step S413.

[0080] S416, the processor issues an alarm notification.

[0081] S417, the processor determines that the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit are correctly connected.

[0082] S418, the processor determines that the connection of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit is incorrect.

[0083] The S419 processor controls the operation of the indoor unit based on the connection status.

[0084] Among them, the third temperature difference threshold is greater than the fourth temperature difference threshold.

[0085] In this embodiment, during cooling operation, reducing the opening of the electronic expansion valve increases the temperature difference between the liquid pipe and gas pipe of the indoor unit. When the air conditioning system is functioning correctly, the second temperature difference value changes accordingly. The system determines whether the change satisfies either a first temperature difference value greater than or equal to a first temperature difference threshold and a second temperature difference value greater than or equal to a third temperature difference threshold, or a first temperature difference value less than or equal to a second temperature difference threshold and a second temperature difference value less than or equal to a fourth temperature difference threshold. If these conditions are not met, the opening of the electronic expansion valve in the indoor unit is further reduced to a preset valve opening for a specified duration. If the conditions are still not met even when the electronic expansion valve is reduced to its minimum opening, an alarm is triggered. This improves the accuracy of the detection and control of the multi-split air conditioning system.

[0086] Optionally, the above method further includes: before the indoor unit operates in heating mode at a first preset valve opening for a first duration, the processor controls the indoor unit to operate in air supply mode at a fifth preset valve opening. After the indoor unit operates in air supply mode for a third duration, the processor detects the third liquid pipe temperature and the third gas pipe temperature of the indoor unit. The processor corrects the temperature value detected by the liquid pipe temperature sensor of the indoor unit based on the third liquid pipe temperature. The processor corrects the temperature value detected by the gas pipe temperature sensor of the indoor unit based on the third gas pipe temperature. Preferably, the value range of the fifth preset valve opening is [180 steps, 240 steps]. Preferably, the value range of the third duration is [3 minutes, 5 minutes]. The third duration can be determined based on the liquid pipe temperature and the gas pipe temperature. When the liquid pipe temperature and the gas pipe temperature are close to the ambient temperature, the air supply operation is stopped. The third duration can also be preset in advance. If the multi-split air conditioner has been operated in cooling or heating mode before operating in air supply mode, running in air supply mode for a third duration can allow the liquid pipe temperature and the gas pipe temperature to quickly recover to the ambient temperature. In this way, the temperatures detected by the liquid pipe temperature sensor and the gas pipe temperature sensor of all indoor units can be basically consistent. By adjusting the temperature values ​​detected by the liquid pipe temperature sensor and / or the gas pipe temperature sensor of the indoor unit based on the temperatures of the third liquid pipe and the third gas pipe, the detection values ​​of the temperature sensors can be made more accurate. This, in turn, makes the determination of the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit more accurate, further improving the accuracy of detection and control.

[0087] Combination Figure 5 As shown in the embodiments of this disclosure, another method for controlling a multi-split air conditioner is provided, including:

[0088] S501, the processor controls the indoor unit to operate with the fifth preset valve opening degree.

[0089] S502, after the indoor unit has been running for three hours, the processor detects the temperature of the third liquid pipe and the third gas pipe of the indoor unit.

[0090] S503, the processor corrects the temperature value detected by the liquid pipe temperature sensor of the indoor unit based on the temperature of the third liquid pipe.

[0091] S504, the processor corrects the temperature value detected by the gas pipe temperature sensor of the indoor unit based on the temperature of the third gas pipe.

[0092] S505, the processor controls the indoor unit to operate in heating mode at the first preset valve opening degree.

[0093] S506, after the indoor unit has been running in heat for the first time, the processor obtains the temperature of the first liquid pipe and the temperature of the first gas pipe of the indoor unit.

[0094] S507, the processor calculates the first temperature difference ΔT1 = T 气1 -T 液1 Among them, T气1 The first tracheal temperature detected by the tracheal temperature sensor, T 液1 The temperature of the first liquid tube detected by the liquid tube temperature sensor.

[0095] S508, the processor determines the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit based on the first temperature difference value.

[0096] The S509 processor controls the operation of the indoor unit based on the connection status.

[0097] In this embodiment, by correcting the temperature values ​​detected by the liquid pipe temperature sensor and the gas pipe temperature sensor of the indoor unit according to the third liquid pipe temperature and the third gas pipe temperature respectively, the detection values ​​of the temperature sensors can be made more accurate. This makes the determination of the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit more accurate, further improving the accuracy of detection and control.

[0098] Optionally, the processor corrects the temperature value detected by the liquid pipe temperature sensor of the indoor unit based on the temperature of the third liquid pipe, including: the processor calculating the average liquid pipe temperature of all third liquid pipe temperatures. The processor calculates the third temperature difference ΔT3 = T 液3 -T 液平 If the third temperature difference exceeds the first value range, the processor corrects the temperature value detected by the liquid pipe temperature sensor of the indoor unit. Wherein, T... 液3 The temperature of the third liquid tube, T, is detected by the liquid tube temperature sensor. 液平 This is the average temperature of the liquid pipe. And / or, the processor corrects the temperature value detected by the indoor unit's gas pipe temperature sensor based on the third gas pipe temperature, including: the processor calculating the average gas pipe temperature of all third gas pipe temperatures. The processor calculates the fourth temperature difference ΔT4 = T 气3 -T 气平 If the fourth temperature difference value exceeds the second value range, the processor corrects the temperature value detected by the indoor unit's gas pipe temperature sensor. Wherein, T... 气3 The third tracheal temperature, T, is detected by the tracheal temperature sensor. 气平The average temperature of the trachea is taken as the average temperature. For example, if the temperature of the third liquid tube is 18℃ and the average liquid tube temperature is 20℃, then the third temperature difference ΔT3 is 18-20=-2. Preferably, both the first and second value ranges are [-2, 2]. Of course, the first and second value ranges can be set as needed. Since there will be a certain accuracy error between the temperature value measured by the temperature sensor and the actual temperature value, in some cases, the measurement error of individual temperature sensors may be large. For example, the actual temperature value is 20℃, and the temperature sensor measurement value is 16℃. By calculating the average measurement value of all liquid tube temperature sensors or trachea sensors, a reference value for temperature measurement can be obtained. Even if the measurement error of a certain temperature sensor is large, the error will be distributed after calculating the average value, and the impact on the reference value will be small. By further comparing the difference between the temperature value measured by the temperature sensor and the reference value, it can be determined whether the temperature sensor measurement value is accurate. In the case of inaccuracy, the temperature sensor measurement value can be positively or negatively corrected according to the reference value. Thus, the temperature sensor measurement value can be made more accurate.

[0099] Combination Figure 6 As shown, this disclosure provides another device 300 for controlling a multi-split air conditioner, including a processor 100 and a memory 101 storing program instructions. Optionally, the device may further include a communication interface 102 and a bus 103. The processor 100, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call logical instructions in the memory 101 to execute the method for controlling a multi-split air conditioner described in the above embodiment.

[0100] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0101] The memory 101, as a storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, thereby implementing the method for controlling multi-split air conditioners in the above embodiments.

[0102] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and may also include non-volatile memory.

[0103] This disclosure provides a multi-split air conditioner, including a multi-split air conditioner body and the aforementioned device 300 for controlling the multi-split air conditioner. The device 300 for controlling the multi-split air conditioner is installed in the multi-split air conditioner body. The installation relationship described herein is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the device 300 for controlling the multi-split air conditioner can be adapted to feasible product bodies to achieve other feasible embodiments.

[0104] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for descriptive purposes only and is not intended to limit the claims. As used in the description of the embodiments and claims, the singular form "a" is used unless the context clearly indicates otherwise.

[0105] (a) The terms “an” and “the” are intended to include the plural forms as well. Similarly, the term “and / or” as used herein means including one or more of the associated listed items and all possible combinations thereof. Additionally, the term “comprising” is used herein.

[0106] The word "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Unless otherwise specified, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0107] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0108] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0109] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling a multi-split air conditioner, characterized in that, Multi-split air conditioners include an outdoor unit and multiple indoor units, each indoor unit including a liquid line temperature sensor and a gas line temperature sensor; the method includes: When the indoor unit of the multi-split air conditioner is running in heating mode at the first preset valve opening for a first duration, the first liquid pipe temperature and the first gas pipe temperature of the indoor unit are obtained. Calculate the first temperature difference ΔT1=T 气1 -T 液1 Among them, T 气1 The first tracheal temperature detected by the tracheal temperature sensor, T 液1 The temperature of the first liquid tube detected by the liquid tube temperature sensor; After determining the first temperature difference, the indoor unit is controlled to operate at the second preset valve opening for cooling, and during the cooling operation of each indoor unit, the indoor fan is controlled to operate at a high speed; wherein, the second preset valve opening is smaller than the first preset valve opening. After the indoor unit has been running in cooling mode for a second period of time, the temperature of the second liquid pipe and the temperature of the second gas pipe of the indoor unit are obtained. Calculate the second temperature difference ΔT2=T 气2 -T 液2 Among them, T 气2 The second tracheal temperature, T, is detected by the tracheal temperature sensor. 液2 The temperature of the second liquid tube detected by the liquid tube temperature sensor; Based on the first temperature difference and the second temperature difference, determine the connection status of the gas pipe temperature sensor and the liquid pipe temperature sensor of the indoor unit. Control the operation of the indoor unit according to the connection status; Specifically, determining the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit based on the first temperature difference and the second temperature difference includes: if the first temperature difference is greater than or equal to a first temperature difference threshold and the second temperature difference is greater than or equal to a third temperature difference threshold, the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit is determined to be correct; if the first temperature difference is less than or equal to a second temperature difference threshold and the second temperature difference is less than or equal to a fourth temperature difference threshold, the connection status of the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit is determined to be incorrect. When the first temperature difference is greater than or equal to the first temperature difference threshold and the second temperature difference is less than the third temperature difference threshold, the opening of the electronic expansion valve of the indoor unit is reduced; when the first temperature difference is less than or equal to the second temperature difference threshold and the second temperature difference is greater than the fourth temperature difference threshold, the opening of the electronic expansion valve is reduced; wherein, the first temperature difference threshold is greater than the second temperature difference threshold and the third temperature difference threshold is greater than the fourth temperature difference threshold.

2. The method according to claim 1, characterized in that, The connection status includes whether the connection is correct or incorrect; controlling the operation of the indoor unit based on the connection status includes: If the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit are correctly connected, the first detected temperature difference ΔT will be used as the basis for the calculation. 1检 =T 气检 -T 液检 Control the operation of the indoor unit; If the gas pipe temperature sensor and liquid pipe temperature sensor of the indoor unit are incorrectly connected, the second detected temperature difference value ΔT will be used. 2检 =T 液检 -T 气检 Control the operation of the indoor unit; Among them, T 气检 The temperature value detected by the tracheal temperature sensor, T 液检 This is the temperature value detected by the liquid tube temperature sensor.

3. The method according to claim 1 or 2, characterized in that, Also includes: Before the indoor unit operates in heating mode at the first preset valve opening for a first duration, the indoor unit is controlled to operate in air supply mode at the fifth preset valve opening. After the indoor unit has been running for three hours, the temperature of the third liquid pipe and the temperature of the third gas pipe of the indoor unit are detected. The temperature value detected by the liquid pipe temperature sensor of the indoor unit is corrected based on the temperature of the third liquid pipe. The temperature value detected by the gas pipe temperature sensor of the indoor unit is corrected based on the temperature of the third gas pipe.

4. The method according to claim 3, characterized in that, The step of correcting the temperature value detected by the liquid pipe temperature sensor of the indoor unit based on the temperature of the third liquid pipe includes: Calculate the average liquid tube temperature for all third liquid tube temperatures; Calculate the third temperature difference ΔT3=T 液3 -T 液平 ; If the third temperature difference exceeds the first value range, the temperature value detected by the liquid pipe temperature sensor of the indoor unit is corrected. Among them, T 液3 The temperature of the third liquid tube, T, is detected by the liquid tube temperature sensor. 液平 This represents the average temperature of the liquid tube. And / or, The step of correcting the temperature value detected by the gas pipe temperature sensor of the indoor unit based on the third gas pipe temperature includes: Calculate the average tracheal temperature for all third tracheal temperatures; Calculate the fourth temperature difference ΔT4=T 气3 -T 气平 ; If the fourth temperature difference value exceeds the second value range, the temperature value detected by the gas pipe temperature sensor of the indoor unit is corrected. Among them, T 气3 The third tracheal temperature, T, is detected by the tracheal temperature sensor. 气平 This represents the average temperature of the trachea.

5. A device for controlling a multi-split air conditioner, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute, when running program instructions, the method for controlling a multi-split air conditioner as described in any one of claims 1 to 4.

6. A multi-split air conditioner, characterized in that, include: Multi-split air conditioner unit; and, The device for controlling a multi-split air conditioner as described in claim 5 is installed on the main body of the multi-split air conditioner.

Images