Variable frequency air conditioner multi-mode fault stage processing method and system

Abstract

The invention relates to the technical field of air conditioner control, in particular to a multi-mode fault stage processing method and system for a variable frequency air conditioner, and the method comprises the following steps: S100, monitoring the operation data of an indoor unit and an outdoor unit in an air conditioning system; the operation data comprises a communication state signal and a driving abnormal signal; s200, according to the operation data, whether the air conditioning system has an operation fault or not is analyzed, if yes, the fault type is analyzed, and S300 is executed; s300, the operation mode of the air conditioning system is obtained; and S400, according to the fault type and the operation mode of the air conditioning system, a fault processing strategy is generated. By adopting the scheme, differentiated fault processing strategies can be generated according to different fault types and operation modes, so that the fault recovery efficiency is improved, and the hardware loss is reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioning control technology, and in particular to a method and system for multimodal fault classification and handling of variable frequency air conditioners. Background Technology

[0002] As a core component of modern building environmental control, the operational stability of variable frequency air conditioners directly impacts user experience and equipment lifespan. During operation, communication interruptions and drive anomalies (including compressor drive failure, PFC drive failure, and DC fan drive failure) are two common types of faults. Communication interruptions may prevent the air conditioning system from receiving control commands or providing timely feedback on operating status information, thus affecting the coordinated operation of the entire system. Drive anomalies, on the other hand, directly affect the normal operation of critical components such as the compressor; once they occur, they can easily trigger a series of chain reactions, seriously threatening the normal operation of the air conditioning system.

[0003] Currently, the industry generally uses a single automatic restart mechanism to deal with such faults. However, this traditional approach has several significant drawbacks. First, the mechanism only attempts to restore system operation based on a preset number of restarts, ignoring the differences between different fault types and the different operating modes of the air conditioner. For example, a communication interruption in cooling mode may have drastically different causes and impacts than a similar fault in heating mode, but a single restart strategy cannot differentiate and handle these situations precisely, resulting in low fault recovery efficiency. Second, frequent start-stop operations subject the motor windings to multiple current surges in a short period, leading to excessive temperature rise. Prolonged exposure to this condition gradually degrades the insulation performance of the motor windings, accelerating the aging process and significantly shortening the lifespan of the hardware, increasing maintenance costs and replacement frequency. Finally, existing technology fails to differentiate between initial and subsequent faults, causing minor anomalies to be over-processed. This not only fails to address the root cause of the problem but may also mask the underlying true cause of the fault, creating a breeding ground for more serious subsequent failures.

[0004] In summary, existing fault handling methods for variable frequency air conditioners are insufficient to meet the requirements of modern building environments for high reliability, high efficiency, and long lifespan of air conditioning systems. Therefore, there is an urgent need to provide a multi-modal fault classification and handling method and system for variable frequency air conditioners, which can improve the fault recovery efficiency of air conditioners and reduce hardware wear and tear. Summary of the Invention

[0005] This invention provides a method and system for multimodal fault classification and processing of variable frequency air conditioners, which can generate differentiated fault handling strategies according to different fault types and operating modes, thereby improving fault recovery efficiency and reducing hardware wear and tear.

[0006] The basic solution provided by this invention is as follows:

[0007] A method for classifying and handling multimodal faults in a variable frequency air conditioner includes the following steps:

[0008] S100, monitors the operating data of the indoor and outdoor units in the air conditioning system; the operating data includes communication status signals and drive abnormality signals;

[0009] S200: Based on the operating data, analyze whether there is an operating fault in the air conditioning system. If so, analyze the fault type and execute S300.

[0010] S300, obtain the operating mode of the air conditioning system;

[0011] S400 generates fault handling strategies based on the fault type and operating mode of the air conditioning system.

[0012] Furthermore, the operating modes include one or more of the following: trial operation mode, commercial inspection mode, cooling mode, dehumidification mode, heating mode, and self-cleaning mode.

[0013] Furthermore, the fault types include communication interruption and driver anomaly.

[0014] Furthermore, in S400, when the fault type is communication interruption and the operating mode is cooling mode or dehumidification mode, the indoor unit is kept running, and the room temperature, set temperature and indoor coil temperature are obtained. The room temperature and / or indoor coil temperature are analyzed to see if there is any abnormality. If so, the outdoor unit is controlled to cut off power for 1 minute and then power is restored. If communication is still interrupted after power is restored, the air conditioning system is controlled to stop.

[0015] Further, analyzing whether the room temperature and / or indoor coil temperature are abnormal includes: if any of the following temperature conditions are met, it is determined that the room temperature and / or indoor coil temperature are abnormal, the temperature conditions include:

[0016] Room temperature ≤ set temperature - 1℃;

[0017] Indoor coil temperature < 0℃;

[0018] Indoor coil temperature > room temperature + 5℃;

[0019] The indoor coil temperature is greater than room temperature - 2°C and remains so for 3 minutes.

[0020] Furthermore, in S400, when the fault type is communication interruption and the operating mode is heating mode or self-cleaning mode, the outdoor unit is powered off for 3 minutes and then the power supply is restored. If the communication is still interrupted after the power supply is restored, the air conditioning system is shut down.

[0021] Furthermore, in S400, when the fault type is drive abnormality, the outdoor unit automatically restarts a preset number of times; it analyzes whether the outdoor unit restarts successfully. If not, it obtains the number of drive abnormalities within a preset time period; it analyzes whether the number of drive abnormalities within the preset time period is greater than the preset number. If so, it controls the air conditioning system to stop running and generates a fault code. If not, the indoor unit controls the outdoor unit to cut off power for a preset power-off time and then restarts it.

[0022] Furthermore, in the S400, when the operating mode is trial operation mode or commercial inspection mode, the air conditioning system is controlled to stop operating.

[0023] The second basic solution provided by this invention is a multi-modal fault classification and processing system for variable frequency air conditioners, which uses the above-mentioned multi-modal fault classification and processing method for variable frequency air conditioners.

[0024] Furthermore, including:

[0025] The data monitoring module is used to monitor the operating data of the indoor and outdoor units in the air conditioning system;

[0026] The fault analysis module is used to analyze the fault types of the air conditioning system based on the operating data.

[0027] The mode acquisition module is used to acquire the operating mode of the air conditioning system;

[0028] The strategy generation module is used to generate fault handling strategies based on the fault type and operating mode of the air conditioning system.

[0029] The principles and advantages of this invention are as follows:

[0030] Existing technologies face a dilemma in fault recovery: frequent restarts ensure continuity but sacrifice hardware lifespan, while direct shutdown protects hardware but disrupts user experience. To address this, this solution employs a temperature-triggered intelligent fault-tolerance mechanism. Specifically, when communication is interrupted in cooling or dehumidifying modes, the relationship between room temperature, coil temperature, and set temperature is compared in real time. This allows the air conditioner to accurately intercept the risk of temperature runaway while ensuring basic operation, thereby reducing room temperature fluctuations and minimizing user discomfort. Furthermore, a limited number of autonomous restarts by the outdoor unit and coordinated restarts by the indoor unit maintain system continuity through an initial rapid response and avoids ineffective attempts through subsequent coordinated restarts. This effectively improves the system recovery success rate and reduces compressor start-up and shutdown losses, thus extending system lifespan. Attached Figure Description

[0031] Figure 1 This is a flowchart of an embodiment of a multi-modal fault classification and processing method for variable frequency air conditioners according to the present invention.

[0032] Figure 2This is a logic block diagram of Embodiment 2 of the variable frequency air conditioner multimodal fault classification and processing system of the present invention.

[0033] Figure 3 This is a logic block diagram of Embodiment 3 of the variable frequency air conditioner multimodal fault classification and processing system of the present invention. Detailed Implementation

[0034] The following detailed description illustrates the specific implementation method:

[0035] Example 1:

[0036] A method for classifying and handling multimodal faults in variable frequency air conditioners, such as Figure 1 As shown, it includes the following steps:

[0037] S100 monitors the operating data of the indoor and outdoor units in the air conditioning system; the operating data includes communication status signals and drive abnormality signals.

[0038] S200: Based on the operating data, analyze whether there is an operational fault in the air conditioning system. If so, analyze the fault type and execute S300. In this embodiment, the fault types include communication interruption and drive abnormality. Specifically, the indoor unit continuously sends a communication signal to the outdoor unit through a preset protocol. If no valid response signal is received from the outdoor unit after a preset feedback time, a communication fault is determined to have occurred, and the fault type is communication interruption. The outdoor unit monitors the current and voltage of the compressor, PFC, and fan in real time, and analyzes whether any of the compressor, PFC, and fan has an overcurrent or overvoltage abnormality. If so, it reports a drive abnormality signal including an overcurrent code or overvoltage code to the indoor unit. When the indoor unit receives the drive abnormality signal, it determines that there is an operational fault in the air conditioning system and determines the fault type to be drive abnormality. The drive abnormality includes one or more of the following: compressor drive fault, PFC drive fault, and DC fan drive fault.

[0039] S300, Obtain the operating mode of the air conditioning system; the operating mode includes one or more of the following: trial operation mode, commercial inspection mode, cooling mode, dehumidification mode, heating mode, and self-cleaning mode. In this embodiment, all of the above operating modes are included.

[0040] S400 generates fault handling strategies based on the fault type and operating mode of the air conditioning system.

[0041] S401, Analyze whether the operating mode of the air conditioning system is trial operation mode or commercial inspection mode. If so, control the air conditioning system to stop operating and save the operating status parameters instantly when a fault occurs to ensure the integrity of the test data. If not, execute S402.

[0042] S402, Analyze whether the fault type of the air conditioning system is a communication interruption. If yes, execute S403; otherwise, execute S404.

[0043] S403, when the fault type is communication interruption and the operating mode is cooling mode or dehumidification mode, maintain the indoor unit operation and acquire the room temperature, set temperature, and indoor coil temperature. Analyze whether the room temperature and / or indoor coil temperature are abnormal. If so, control the outdoor unit to cut off power for 1 minute and then restore power. If communication is still interrupted after power is restored, control the air conditioning system to shut down. Analyzing whether the room temperature and / or indoor coil temperature are abnormal includes: if any of the following temperature conditions are met, it is determined that the room temperature and / or indoor coil temperature are abnormal, the temperature conditions include:

[0044] Room temperature ≤ set temperature - 1℃;

[0045] Indoor coil temperature < 0℃;

[0046] Indoor coil temperature > room temperature + 5℃;

[0047] The indoor coil temperature is greater than room temperature - 2°C and remains so for 3 minutes.

[0048] When the fault type is communication interruption and the operating mode is heating mode or self-cleaning mode, the outdoor unit will be powered off for 3 minutes and then the power supply will be restored. If the communication interruption still occurs after the power supply is restored, the air conditioning system will be shut down.

[0049] Restart Verification: After the outdoor unit is powered on, the indoor unit monitors whether communication has been restored. If so, it continues to run and clears the fault record; otherwise, it stops and displays the fault code. This visualization of fault codes improves the accuracy of fault diagnosis for non-professionals.

[0050] S404, when the fault type is drive malfunction, the outdoor unit automatically restarts a preset number of times; in this embodiment, the preset number of restarts is 6 times. The system analyzes whether the outdoor unit restarts successfully. If yes, it continues to run; if not, it obtains the number of drive malfunctions within a preset time period. It then analyzes whether the number of drive malfunctions within the preset time period is greater than the preset number. If yes, it controls the air conditioning system to stop running and generates a fault code, which is displayed on the panel. If not, the indoor unit controls the outdoor unit to cut off power for a preset power-off time before restarting again. In this embodiment, the preset time period is within 2 hours, and the preset number of restarts is 1. That is, if a second drive malfunction occurs within 2 hours (at which point the outdoor unit has attempted to restart 12 times unsuccessfully), it will no longer attempt to restart to avoid invalid attempts.

[0051] To provide a clearer description, the handling process when a driver fault is detected will be explained again:

[0052] 1) The outdoor unit automatically performs the first restart, attempting to restart N times;

[0053] 2) If the first restart fails, report to the indoor unit, triggering the indoor unit to control the outdoor unit to power off and restart (completing the first round);

[0054] 3) After a power outage and restart, the outdoor unit will perform a second restart, attempting to restart N times (totaling 2N times);

[0055] 4) If the second restart fails, the air conditioning system will be stopped and a fault code will be generated and displayed.

[0056] The outdoor and indoor units exchange fault status and restart results in real time to ensure dynamic adjustment of recovery strategies. For example, when the outdoor unit attempts to restart due to a drive failure, the indoor unit triggers a shutdown after the 12th failure, avoiding wear and tear on the hardware caused by frequent start-stop cycles.

[0057] In summary, this solution can generate differentiated fault handling strategies based on different fault types and operating modes, thereby improving fault recovery efficiency and reducing hardware wear and tear.

[0058] Example 2:

[0059] A multi-modal fault classification and processing system for variable frequency air conditioners uses the aforementioned multi-modal fault classification and processing method for variable frequency air conditioners, such as... Figure 2 As shown, it includes:

[0060] The data monitoring module is used to monitor the operating data of the indoor and outdoor units in the air conditioning system.

[0061] The fault analysis module is used to analyze the fault types of the air conditioning system based on the operating data.

[0062] The mode acquisition module is used to acquire the operating mode of the air conditioning system.

[0063] The strategy generation module is used to generate fault handling strategies based on the fault type and operating mode of the air conditioning system.

[0064] Example 3:

[0065] A multi-modal fault classification and processing system for variable frequency air conditioners uses the aforementioned multi-modal fault classification and processing method for variable frequency air conditioners, such as... Figure 3 As shown, it includes an indoor unit module and an outdoor unit module.

[0066] The indoor unit module includes:

[0067] The indoor unit monitoring module is used to monitor the communication status between the indoor unit and the outdoor unit and drive fault data in real time.

[0068] The fault classification and processing module is used to generate control strategies based on fault type and operating mode;

[0069] A multi-mode control module is used to dynamically adjust fault handling strategies according to the operating mode;

[0070] The indoor unit power management module is used to control the power outage and restart of the outdoor unit;

[0071] The indoor unit communication module is used to establish a two-way data link with the outdoor unit;

[0072] The fault code visualization module is used to display fault information via a panel or remote control;

[0073] The outdoor unit module includes:

[0074] The outdoor unit communication module is used to receive commands from the indoor unit and provide feedback on the outdoor unit's operating status and drive fault data.

[0075] The outdoor unit power management module is used to supply power to all modules of the outdoor unit;

[0076] The drive fault detection module is used to monitor compressor, PFC, and DC fan drive abnormalities in real time.

[0077] The outdoor unit monitoring module is used to monitor communication status and drive fault data, record the number of restarts, and report faults to the indoor unit.

[0078] The above are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for classifying and handling multi-modal faults in a variable frequency air conditioner, characterized in that: Includes the following steps: S100, monitors the operating data of the indoor and outdoor units in the air conditioning system; the operating data includes communication status signals and drive abnormality signals; S200: Based on the operating data, analyze whether there is an operating fault in the air conditioning system. If so, analyze the fault type and execute S300. S300, obtain the operating mode of the air conditioning system; S400 generates fault handling strategies based on the fault type and operating mode of the air conditioning system.

2. The method for graded fault handling of variable frequency air conditioners according to claim 1, characterized in that: The operating modes include one or more of the following: trial operation mode, commercial inspection mode, cooling mode, dehumidification mode, heating mode, and self-cleaning mode.

3. The method for graded fault handling of variable frequency air conditioners according to claim 2, characterized in that: The fault types include communication interruption and drive anomaly; the drive anomaly includes one or more of compressor drive fault, PFC drive fault and DC fan drive fault.

4. The method for graded fault handling of variable frequency air conditioners according to claim 3, characterized in that: In S400, when the fault type is communication interruption and the operating mode is cooling mode or dehumidification mode, the indoor unit is kept running and the room temperature, set temperature and indoor coil temperature are obtained. The room temperature and / or indoor coil temperature are analyzed to see if there is any abnormality. If so, the outdoor unit is controlled to cut off power for 1 minute and then power is restored. If communication is still interrupted after power is restored, the air conditioning system is controlled to stop.

5. The method for graded fault handling of variable frequency air conditioners according to claim 4, characterized in that: Analyzing whether the room temperature and / or indoor coil temperature are abnormal includes: if any of the following temperature conditions are met, it is determined that the room temperature and / or indoor coil temperature are abnormal, the temperature conditions include: Room temperature ≤ set temperature - 1℃; Indoor coil temperature < 0℃; Indoor coil temperature > room temperature + 5℃; The indoor coil temperature is greater than room temperature - 2°C and remains so for 3 minutes.

6. The method for graded fault handling of variable frequency air conditioners according to claim 3, characterized in that: In S400, when the fault type is communication interruption and the operating mode is heating mode or self-cleaning mode, the outdoor unit is powered off for 3 minutes and then the power supply is restored. If the communication is still interrupted after the power supply is restored, the air conditioning system is shut down.

7. The method for graded fault handling of variable frequency air conditioners according to claim 3, characterized in that: In S400, when the fault type is drive abnormality, the outdoor unit will automatically restart a preset number of times; Analyze whether the outdoor unit restarted successfully. If not, obtain the number of drive anomalies within a preset time period. Analyze whether the number of drive anomalies within the preset time period is greater than the preset number. If so, control the air conditioning system to stop running and generate a fault code. If not, the indoor unit controls the outdoor unit to cut off power for a preset power-off time and then restarts it.

8. The method for graded fault handling of variable frequency air conditioners according to claim 3, characterized in that: In S400, when the operating mode is trial operation mode or commercial inspection mode, the air conditioning system is controlled to stop operating.

9. A multi-modal fault classification and processing system for variable frequency air conditioners, characterized in that: The variable frequency air conditioner multi-modal fault classification and processing method according to any one of claims 1 to 8 is used.

10. The variable frequency air conditioner multi-mode fault classification and processing system according to claim 9, characterized in that: include: The data monitoring module is used to monitor the operating data of the indoor and outdoor units in the air conditioning system; The fault analysis module is used to analyze the fault types of the air conditioning system based on the operating data. The mode acquisition module is used to acquire the operating mode of the air conditioning system; The strategy generation module is used to generate fault handling strategies based on the fault type and operating mode of the air conditioning system.

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