Compressor and variable capacity mechanism fault detection method, device and system, medium

Abstract

The present disclosure relates to a compressor and a variable capacity mechanism fault detection method, device and system thereof, and a medium. The compressor variable capacity mechanism fault detection method comprises: controlling the compressor to start and frequency up to a test frequency according to a first mode, obtaining a reference current after the compressor is stably running, the first mode being a double-cylinder mode or a single-cylinder mode; sending a first switching instruction to the compressor, and controlling the compressor to switch from the first mode to a second mode, wherein the second mode is a reverse mode of the first mode; obtaining a first current change value within a predetermined time period after the first switching instruction is sent; and determining whether the variable capacity mechanism is faulty according to whether the first current change value is greater than a predetermined threshold. The present disclosure can quickly and accurately determine whether the variable capacity electromagnetic valve and the sliding vane mechanism are normally actuated during the starting stage of the compressor, thereby improving the refrigeration / heating effect and improving the system energy efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of compressor fault detection technology, and in particular to a method, device, system, and medium for detecting faults in compressors and their variable displacement mechanisms. Background Technology

[0002] In variable capacity compressor technology, especially rotary variable capacity compressors used in residential and commercial air conditioners, "cylinder unloading" technology is typically used to adjust the discharge volume (such as dual-cylinder / single-cylinder switching). The core actuators of a variable capacity compressor usually include vanes, pins, and high-pressure and low-pressure solenoid valves that control the back pressure.

[0003] The sliding vane mechanism in related technologies often includes a mechanical return spring, which automatically resets the vane to a specific state when power is off. However, in order to simplify the structure, reduce noise and cost, the new generation of variable capacity compressors has eliminated the mechanical return spring and relies entirely on the high and low pressure difference introduced by the switching of solenoid valves to drive the vane movement. Summary of the Invention

[0004] The inventors discovered through research that if the solenoid valve of a variable-capacity compressor without a mechanical return spring is damaged, the control system issues a "cylinder change" command but does not actually execute it. The compressor will continue to operate at the wrong volume, resulting in poor cooling / heating performance and low energy efficiency.

[0005] In view of at least one of the above technical problems, this disclosure provides a method, device and system for detecting faults in a compressor and its variable capacity mechanism, and a medium that can quickly and accurately determine whether the variable capacity solenoid valve and the sliding vane mechanism are operating normally during the compressor start-up phase, thereby improving the cooling / heating effect and increasing the system energy efficiency.

[0006] According to one aspect of this disclosure, a method for detecting faults in a compressor variable displacement mechanism is provided, comprising:

[0007] The compressor is controlled to start in the first mode and increase the frequency to the test frequency to obtain the reference current after the compressor is running stably. The compressor's variable capacity mechanism has no return spring, and the first mode is a dual-cylinder mode or a single-cylinder mode.

[0008] A first switching command is sent to the compressor to control the compressor to switch from the first mode to the second mode, wherein the second mode is the reverse mode of the first mode, and the dual-cylinder mode and the single-cylinder mode are the reverse modes of each other;

[0009] Obtain the first current change value within a predetermined time period after sending the first switching instruction;

[0010] Whether the variable capacity mechanism is faulty is determined based on whether the first current change value is greater than a predetermined threshold.

[0011] In some embodiments of this disclosure, determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than a predetermined threshold includes:

[0012] Send a second switching command to the compressor to control the compressor to switch from the second mode to the first mode;

[0013] Obtain the second current change value within a predetermined time period after sending the second switching command;

[0014] The malfunction of the variable capacity mechanism is determined based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold.

[0015] In some embodiments of this disclosure, determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold includes:

[0016] If the first current change value is not greater than a predetermined threshold and the second current change value is not greater than a predetermined threshold, the variable capacitance mechanism is determined to be stuck.

[0017] Obtain the current value of the compressor;

[0018] Based on the current value, it is determined whether the variable displacement mechanism is stuck in a single-cylinder state or a double-cylinder state.

[0019] In some embodiments of this disclosure, determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold includes:

[0020] If the first current change value is greater than a predetermined threshold and the second current change value is not greater than a predetermined threshold, it is determined that the variable capacity mechanism is stuck in the second mode state, and the compressor is controlled to operate in the second mode.

[0021] In some embodiments of this disclosure, determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold includes:

[0022] If the first current change value is not greater than a predetermined threshold and the second current change value is greater than a predetermined threshold, it is determined that the variable capacity mechanism is abnormally started in the first mode, and the compressor is controlled to operate in the first mode.

[0023] In some embodiments of this disclosure, determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold includes:

[0024] If the first current change value is not greater than a predetermined threshold and the second current change value is greater than a predetermined threshold, it is determined that the variable capacity mechanism is abnormally started in the first mode, and a third switching command is sent to the compressor to control the compressor to switch from the first mode to the second mode.

[0025] Obtain the third current change value within a predetermined time period after sending the third switching command;

[0026] The fault type of the variable capacitance mechanism is determined based on whether the change value of the third current is greater than a predetermined threshold.

[0027] In some embodiments of this disclosure, determining the fault type of the variable capacitance mechanism based on whether the third current change value is greater than a predetermined threshold includes:

[0028] If the third current change value is greater than a predetermined threshold, it is determined that the variable capacitance mechanism is abnormally started according to the first mode, and the current state of the variable capacitance mechanism is determined to be normal.

[0029] In some embodiments of this disclosure, determining the fault type of the variable capacitance mechanism based on whether the third current change value is greater than a predetermined threshold includes:

[0030] If the change value of the third current is not greater than a predetermined threshold, it is determined that the variable capacity mechanism is abnormally started in the first mode, and it is determined that the variable capacity mechanism is currently stuck in the first mode state, and the compressor is controlled to operate in the first mode.

[0031] In some embodiments of this disclosure, the compressor is a dual-valve, dual-cylinder variable-capacity compressor, and the compressor includes a high-pressure solenoid valve and a low-pressure solenoid valve.

[0032] In some embodiments of this disclosure, when the first mode is a dual-cylinder mode, both the first switching command and the third switching command are single-cylinder mode commands, and both the second switching command are dual-cylinder mode commands.

[0033] In some embodiments of this disclosure, when the first mode is a single-cylinder mode, the first switching command and the third switching command are both dual-cylinder mode commands, and the second switching command is a single-cylinder mode command.

[0034] In some embodiments of this disclosure, the single-cylinder mode command includes controlling the high-pressure solenoid valve to close and the low-pressure solenoid valve to open.

[0035] In some embodiments of this disclosure, the dual-cylinder mode command includes controlling the high-pressure solenoid valve to open and the low-pressure solenoid valve to close.

[0036] In some embodiments of this disclosure, the compressor variable displacement mechanism fault detection method further includes:

[0037] Report the fault code and fault type of the compressor, wherein the fault type includes at least one of the following: the variable displacement mechanism is stuck in a single cylinder state, the variable displacement mechanism is stuck in a dual cylinder state, the variable displacement mechanism is abnormally started according to the first mode, the variable displacement mechanism is abnormally started according to the first mode and the current state is normal, and the variable displacement mechanism is abnormally started according to the first mode and is currently stuck in the first mode state.

[0038] In some embodiments of this disclosure, the compressor variable displacement mechanism fault detection method further includes at least one of the following steps:

[0039] When the variable displacement mechanism is stuck in a single-cylinder state, the maximum operating frequency of the compressor is limited;

[0040] When the variable displacement mechanism is stuck in the dual-cylinder state, the minimum operating frequency of the compressor is limited.

[0041] In some embodiments of this disclosure, determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold includes:

[0042] If the first current change value is greater than a predetermined threshold and the second current change value is greater than a predetermined threshold, the variable capacity mechanism is determined to be functional and the compressor is determined to be fault-free.

[0043] According to another aspect of this disclosure, a fault detection device for a compressor variable displacement mechanism is provided, comprising:

[0044] The control module is configured to control the compressor to start in a first mode and increase the frequency to the test frequency, and to obtain the reference current after the compressor is running stably. The compressor's variable capacity mechanism has no return spring, and the first mode is a dual-cylinder mode or a single-cylinder mode.

[0045] The instruction sending module is configured to send a first switching instruction to the compressor to control the compressor to switch from the first mode to the second mode, wherein the second mode is the reverse mode of the first mode, and the dual-cylinder mode and the single-cylinder mode are the reverse modes of each other;

[0046] The current change value acquisition module is configured to acquire the first current change value within a predetermined time period after the first switching instruction is sent.

[0047] The fault detection module is configured to determine whether the variable capacity mechanism is faulty based on whether the first current change value is greater than a predetermined threshold.

[0048] According to another aspect of this disclosure, a fault detection device for a compressor variable displacement mechanism is provided, comprising:

[0049] Memory; and

[0050] A processor coupled to the memory is configured to execute the compressor variable displacement mechanism fault detection method as described in any of the above embodiments, based on instructions stored in the memory.

[0051] According to another aspect of this disclosure, a compressor variable displacement mechanism fault detection system is provided, comprising:

[0052] The compressor variable capacity mechanism fault detection device as described in any of the above embodiments;

[0053] The current acquisition device is configured to acquire the compressor current based on the indication of the compressor variable capacity mechanism fault detection device.

[0054] According to another aspect of this disclosure, a compressor is provided, including a compressor variable displacement mechanism fault detection system as described in any of the above embodiments.

[0055] According to another aspect of this disclosure, an electrical device is provided, including a compressor as described in any of the above embodiments.

[0056] According to another aspect of this disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions that, when executed by a processor, implement the compressor variable displacement mechanism fault detection method as described in any of the above embodiments.

[0057] According to another aspect of this disclosure, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, it implements the compressor variable displacement mechanism fault detection method as described in any of the above embodiments.

[0058] This disclosure enables a rapid and accurate determination of whether the variable-capacity solenoid valve and the sliding vane mechanism are functioning correctly during the compressor startup phase, thereby improving the cooling / heating effect of the air conditioner, including the compressor, and enhancing system energy efficiency. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 These are schematic diagrams of some embodiments of the compressor variable displacement mechanism fault detection method disclosed herein.

[0061] Figure 2 This is a schematic diagram of some embodiments of the variable capacity compressor variable capacity mechanism for air conditioners disclosed herein.

[0062] Figure 3 This is a schematic diagram of some other embodiments of the compressor variable displacement mechanism fault detection method disclosed herein.

[0063] Figure 4 This is a schematic diagram of some embodiments of the compressor variable displacement mechanism fault detection method disclosed herein.

[0064] Figure 5 This is a schematic diagram of some embodiments of the compressor variable displacement mechanism fault detection method disclosed herein.

[0065] Figure 6 This is a schematic diagram of some other embodiments of the compressor variable displacement mechanism fault detection method disclosed herein.

[0066] Figure 7 These are schematic diagrams of some embodiments of the compressor variable displacement mechanism fault detection device disclosed herein.

[0067] Figure 8 This is a schematic diagram of the structure of some other embodiments of the compressor variable displacement mechanism fault detection device disclosed herein.

[0068] Figure 9 These are schematic diagrams of some embodiments of the compressor variable displacement mechanism fault detection system disclosed herein. Detailed Implementation

[0069] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0070] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0071] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0072] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0073] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0074] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0075] The inventors also discovered through research that the related technology of variable displacement compressors without mechanical return springs has the following technical problems.

[0076] (1) Uncertainty of state: Due to the lack of a return spring, the variable capacity compressor of the relevant technology may have the vane stuck in any position of "extended" or "retracted", or in an intermediate free state, when the air conditioner is shut down for a long time or the solenoid valve fails (such as open circuit of coil or stuck valve core). The control system cannot know the current physical cylinder state.

[0077] (2) The failure of variable-capacity compressors without mechanical return springs is often concealed: If the solenoid valve is damaged, the control system issues a "cylinder change" command but does not actually execute it, and the compressor will continue to operate at the wrong volume. This will result in poor cooling / heating effect and low energy efficiency. In severe cases, because the system controls the electronic expansion valve according to the dual-cylinder logic, it actually operates as a single cylinder, which often leads to liquid return and damage to the compressor.

[0078] (3) The fault detection methods of variable capacity compressors in related technologies are lagging behind: The detection methods of related technologies usually rely on the feedback of exhaust temperature or system pressure after long-term operation, which takes a long time and is easily misled by ambient temperature.

[0079] (4) In the startup phase, the variable displacement compressor without mechanical return spring in the related technology cannot quickly and accurately determine whether the variable displacement solenoid valve and the sliding vane mechanism are operating normally.

[0080] In view of at least one of the above-mentioned technical problems, this disclosure provides a method, apparatus, system, and medium for detecting faults in compressors and their variable displacement mechanisms. The present disclosure will be described below through specific embodiments.

[0081] Figure 1 These are schematic diagrams of some embodiments of the compressor variable displacement mechanism fault detection method disclosed herein. Figure 1 The embodiments can be implemented by the compressor variable capacity mechanism fault detection device or the compressor variable capacity mechanism fault detection system of this disclosure, or the compressor or electrical equipment of this disclosure. The electrical equipment of this disclosure can be an air conditioner. For example... Figure 1 As shown, Figure 1 The method of the embodiment may include at least one of steps 100 to 400.

[0082] In step 100, the compressor is controlled to start in the first mode and increase the frequency to the test frequency to obtain the reference current after the compressor is running stably. The compressor's variable capacity mechanism has no return spring, and the first mode can be a dual-cylinder mode or a single-cylinder mode.

[0083] In some embodiments of this disclosure, the slide mechanism of the variable displacement mechanism has no return spring.

[0084] In some embodiments of this disclosure, the test frequency may be 40 Hz.

[0085] In some embodiments of this disclosure, step 100 may include: when the air conditioner receives a start command, the compressor starts and increases the frequency to the test frequency F (e.g., 40Hz); during this process, according to the control pause required by the capacity, the opening of the electronic expansion valve is locked and the outdoor fan speed is fixed; wait for a first predetermined time T1 (e.g., 30 seconds) until the speed stabilizes and the lubricating oil film is established; drive the solenoid valve according to the first mode command.

[0086] The embodiments disclosed above implement a steady-speed closed-loop control. During the test, the compressor operating frequency and the opening of the electronic expansion valve are forcibly locked, thereby eliminating current fluctuation interference caused by speed changes.

[0087] Figure 2 This is a schematic diagram of some embodiments of the variable capacity compressor variable capacity mechanism for air conditioners disclosed herein. For example... Figure 2 As shown, the compressor is a dual-valve, dual-cylinder variable-capacity compressor, which includes a high-pressure solenoid valve and a low-pressure solenoid valve.

[0088] In single-cylinder mode, the high-pressure solenoid valve is closed and the low-pressure solenoid valve is opened.

[0089] In dual-cylinder mode, the high-pressure solenoid valve opens and the low-pressure solenoid valve closes.

[0090] In some embodiments of this disclosure, in step 100, when the first mode (initialization mode) is a dual-cylinder mode, the step of controlling the compressor to start in the first mode includes: initializing the compressor in the dual-cylinder mode, controlling the high-pressure solenoid valve to open, and controlling the low-pressure solenoid valve to close.

[0091] In some other embodiments of this disclosure, in step 100, when the first mode (initialization mode) is a single-cylinder mode, the step of controlling the compressor to start in the first mode includes: initializing the compressor in the single-cylinder mode, controlling the high-pressure solenoid valve to close, and controlling the low-pressure solenoid valve to open.

[0092] In step 200, a first switching command is sent to the compressor to control the compressor to switch from the first mode to the second mode.

[0093] In some embodiments of this disclosure, when the first mode (initialization mode) is a dual-cylinder mode, the first switching command is a single-cylinder mode command, which includes controlling the high-pressure solenoid valve to close and the low-pressure solenoid valve to open.

[0094] In some other embodiments of this disclosure, when the first mode (initialization mode) is a single-cylinder mode, the first switching command is a dual-cylinder mode command, which includes controlling the high-pressure solenoid valve to open and the low-pressure solenoid valve to close.

[0095] In step 300, the first current change value within a predetermined time period after sending the first switching command is obtained.

[0096] In some embodiments of this disclosure, the predetermined time period may be 5 seconds.

[0097] In some embodiments of this disclosure, the first current change value is the absolute value of the current change value.

[0098] In some embodiments of this disclosure, when the first mode (initialization mode) is a dual-cylinder mode, the first current change value is the current reduction value.

[0099] In some embodiments of this disclosure, when the first mode (initialization mode) is a single-cylinder mode, the first current change value is the current increase value.

[0100] In step 400, it is determined whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than a predetermined threshold.

[0101] In some embodiments of this disclosure, when the first mode (initialization mode) is a dual-cylinder mode, step 400 may include: if the first current change value is greater than a predetermined threshold, determining that "unloading action is successful" (successful switch from dual-cylinder mode to single-cylinder mode), and that the valve and slide are not stuck; if the first current change value is not greater than the predetermined threshold, determining that the valve is stuck in dual-cylinder mode, or that initialization to dual-cylinder mode failed, initialization was actually in single-cylinder mode, or the initialization state is "fake dual-cylinder mode".

[0102] In some other embodiments of this disclosure, when the first mode (initialization mode) is a single-cylinder mode, step 400 may include: if the first current change value is greater than a predetermined threshold, determining that "loading action is successful" (successful switch from single-cylinder mode to dual-cylinder mode), and that the valve and slide are not stuck; if the first current change value is not greater than the predetermined threshold, determining that the valve is stuck in single-cylinder mode, or determining that initialization to single-cylinder mode failed, initialization is actually dual-cylinder mode, or initialization state is "fake single-cylinder mode".

[0103] The embodiments described above can quickly and accurately determine whether the compressor variable displacement mechanism is faulty by judging whether the decrease in current is greater than a predetermined value during the test of switching from a dual-cylinder to a single-cylinder configuration.

[0104] In the compressor start-up phase, the above-described embodiments of this disclosure can quickly and accurately determine whether the variable capacity solenoid valve and the sliding vane mechanism are operating normally, thereby improving the cooling / heating effect of the air conditioner including the compressor and improving the system energy efficiency.

[0105] The embodiments disclosed above enable rapid diagnosis, which can be completed within the first few minutes of air conditioner startup, without waiting for system thermal equilibrium.

[0106] The above embodiments of this disclosure have high diagnostic reliability. Compared with temperature / pressure parameters, the current signal used in the above embodiments of this disclosure has a high signal-to-noise ratio and is not affected by ambient temperature and humidity.

[0107] The above-described embodiments of this disclosure greatly improve system safety. The above-described embodiments of this disclosure can identify whether the valve is stuck in a "false dual-cylinder" state or a "false single-cylinder" state, thereby correcting the control logic and avoiding compressor overheating or liquid return damage caused by flow mismatch.

[0108] The above embodiments of this disclosure have low hardware costs and are implemented using software logic control plus existing air conditioner hardware (current acquisition device for collecting compressor current), without the need to add additional pressure sensors or displacement sensors.

[0109] Figure 3 This is a schematic diagram of some other embodiments of the compressor variable displacement mechanism fault detection method disclosed herein. Figure 3The embodiments can be implemented by the compressor variable displacement mechanism fault detection device or the compressor variable displacement mechanism fault detection system of this disclosure, or the compressor or electrical equipment of this disclosure. For example... Figure 3 As shown, Figure 3 The method of the embodiment may include at least one of steps 100 to 300 and steps 500 to 700, wherein, Figure 1 Steps 100 to 300 of the embodiment are respectively with Figure 3 Steps 100 to 300 in the embodiment are the same or similar. Figure 1 Step 400 of the embodiment may include Figure 3 At least one of steps 500 to 700 in the embodiment.

[0110] In step 500, a second switching command is sent to the compressor to control the compressor to switch from the second mode to the first mode.

[0111] In some embodiments of this disclosure, when the first mode (initialization mode) is a dual-cylinder mode, the second switching instruction is a dual-cylinder mode instruction, which includes controlling the high-pressure solenoid valve to open and the low-pressure solenoid valve to close.

[0112] In some other embodiments of this disclosure, when the first mode (initialization mode) is a single-cylinder mode, the second switching command is a single-cylinder mode command, which includes controlling the high-pressure solenoid valve to close and the low-pressure solenoid valve to open.

[0113] In step 600, the second current change value within a predetermined time period after sending the second switching command is obtained.

[0114] In some embodiments of this disclosure, the second current change value is the absolute value of the current change value.

[0115] In some embodiments of this disclosure, when the first mode (initialization mode) is a dual-cylinder mode, the second current change value is the current increase value.

[0116] In some embodiments of this disclosure, when the first mode (initialization mode) is a single-cylinder mode, the second current change value is the current reduction value.

[0117] In step 700, it is determined whether the variable capacity mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold.

[0118] The testing logic used in the above embodiments of this disclosure during startup is as follows: after the compressor starts and maintains a constant speed, a switching action of "current setting mode (single-cylinder state or dual-cylinder state) -> reverse mode -> restore setting mode" is executed. The above embodiments of this disclosure use current step judgment logic during the two switching processes to not only detect the absolute value of the current, but also to detect the slope or difference (Delta) of the current change within a preset time window after the switching command is issued, in order to determine whether the variable capacity solenoid valve and the vane mechanism are functioning normally. Therefore, this disclosure can more quickly and accurately determine whether the variable capacity solenoid valve and the vane mechanism are operating normally during the compressor startup phase, thereby further improving the cooling / heating effect of the air conditioner including the compressor and improving system energy efficiency.

[0119] In some embodiments of this disclosure, step 700 may include at least one of steps 710 to 740.

[0120] In step 710, if the first current change value is greater than a predetermined threshold and the second current change value is greater than a predetermined threshold, it is determined that the variable capacity mechanism is functioning properly and the compressor is fault-free.

[0121] In step 720, if the first current change value is not greater than a predetermined threshold and the second current change value is not greater than a predetermined threshold, it is determined that the variable capacitance mechanism is stuck.

[0122] In some embodiments of this disclosure, step 720 may further include at least one of steps 721 to 722.

[0123] In step 721, the current value of the compressor is obtained when the first current change value is not greater than a predetermined threshold and the second current change value is not greater than a predetermined threshold.

[0124] In step 722, based on the current value, it is determined whether the variable capacity mechanism is stuck in a single-cylinder state or a double-cylinder state.

[0125] In the embodiments described above, if the current change values ​​during the two switching operations are not greater than a predetermined threshold, the variable capacity mechanism can be quickly, accurately, and reliably determined, based on the current current value, during the compressor startup phase, whether it is stuck or in a single-cylinder or dual-cylinder state.

[0126] In some embodiments of this disclosure, step 720 may include: determining that the variable displacement mechanism is stuck in a dual-cylinder state when the compressor current value is greater than a first predetermined current value; and determining that the variable displacement mechanism is stuck in a single-cylinder state when the compressor current value is less than a second predetermined current value, wherein the second predetermined current value is less than the first predetermined current value.

[0127] In step 730, if the first current change value is greater than a predetermined threshold and the second current change value is not greater than a predetermined threshold, it is determined that the variable capacity mechanism is stuck in the second mode state, and the compressor is controlled to operate in the second mode.

[0128] In some embodiments of this disclosure, step 720 may include: if the first current change value is greater than a predetermined threshold and the second current change value is not greater than a predetermined threshold when the first mode is a dual-cylinder mode, then it is determined that the load can be unloaded from the dual-cylinder to the single-cylinder but cannot be switched back from the single-cylinder to the dual-cylinder (electromagnetic loading valve failure); report a fault and force operation according to the single-cylinder logic.

[0129] In some embodiments of this disclosure, step 720 may include: if the first current change value is greater than a predetermined threshold and the second current change value is not greater than a predetermined threshold when the first mode is single-cylinder mode, then it is determined that the load can be switched from single-cylinder to dual-cylinder but cannot be switched back from dual-cylinder to single-cylinder (electromagnetic unloading valve failure); report a fault and force operation according to dual-cylinder logic.

[0130] The embodiments of this disclosure can quickly, accurately, and reliably determine whether the first switch is normal and the second switch is abnormal during the compressor startup phase by considering that the current change value of the first switch is greater than a predetermined threshold and the current change value of the second switch is not greater than the predetermined threshold. That is, the compressor can switch from the first mode to the second mode, but cannot switch back from the second mode to the first mode. Therefore, in this case, the compressor can be forced to operate according to the logic of the second mode.

[0131] In step 740, if the first current change value is not greater than a predetermined threshold and the second current change value is greater than a predetermined threshold, it is determined that the variable capacity mechanism is abnormally started in the first mode, and the compressor is controlled to operate in the first mode.

[0132] The embodiments of this disclosure can determine whether the first switching is abnormal and the second switching is normal by the fact that the current change value of the first switching is not greater than a predetermined threshold and the current change value of the second switching is greater than the predetermined threshold during the compressor startup phase.

[0133] The above-described embodiments of this disclosure can accurately identify anomalies in the initialization of the first mode, identify whether the valve is stuck in a "false dual-cylinder" state or a "false single-cylinder" state, thereby correcting the control logic and avoiding compressor overheating or liquid return damage caused by flow mismatch.

[0134] For example, in the above embodiments of this disclosure, when the initialization mode is dual-cylinder mode, the first switching is abnormal, indicating that although the solenoid valve is controlled according to the dual-cylinder command during startup, it is actually a single cylinder, and the valve state is abnormal. Therefore, the above embodiments of this disclosure can identify the abnormal dual-cylinder state during the initialization process, that is, the abnormal process from all valves closing during shutdown to the high-pressure valve being energized and the low-pressure valve being de-energized during initialization. The above embodiments of this disclosure can identify the abnormal "false dual-cylinder" state during initialization.

[0135] In the above embodiments of this disclosure, when the initialization mode is single-cylinder mode, the first switching anomaly indicates that although the solenoid valve is controlled according to the single-cylinder command during startup, it is actually a dual-cylinder system, and the valve state is abnormal. Therefore, the above embodiments of this disclosure can identify the single-cylinder state anomaly during the initialization process, that is, the abnormal process from all valves closing during shutdown to the high-pressure valve losing power and the low-pressure valve gaining power during initialization. The above embodiments of this disclosure can identify the "pseudo-single-cylinder" state anomaly during initialization.

[0136] In some embodiments of this disclosure, step 740 may further include at least one of steps 741 to 743.

[0137] In step 741, if the first current change value is not greater than a predetermined threshold and the second current change value is greater than a predetermined threshold, it is determined that the variable capacity mechanism is abnormally started in the first mode, and a third switching command is sent to the compressor to control the compressor to switch from the first mode to the second mode.

[0138] In step 742, the third current change value within a predetermined time period after the third switching command is sent is obtained.

[0139] In some embodiments of this disclosure, when the first mode (initialization mode) is a dual-cylinder mode, both the first switching command and the third switching command are single-cylinder mode commands. The single-cylinder mode command includes controlling the high-pressure solenoid valve to close and the low-pressure solenoid valve to open.

[0140] Based on the first abnormal switch (from dual-cylinder mode to single-cylinder mode) and the second normal switch (from single-cylinder mode to dual-cylinder mode) in the above embodiments of this disclosure, a third switch (from dual-cylinder mode to single-cylinder mode) is added. Therefore, the above embodiments of this disclosure can quickly, accurately, and reliably determine whether the variable displacement mechanism of the dual-cylinder mode is currently stuck due to an initialization abnormality. Specifically, the above embodiments of this disclosure can quickly, accurately, and reliably determine the initialization abnormality of the dual-cylinder mode by detecting the first abnormal switch, the second normal switch, and the third abnormal switch, indicating that the initialization state is actually single-cylinder mode; and that the variable displacement mechanism is currently stuck in the dual-cylinder mode state, and control the compressor to operate in the dual-cylinder mode. The above embodiments of this disclosure can quickly, accurately, and reliably determine the initialization abnormality of the dual-cylinder mode by detecting the first abnormal switch, the second normal switch, and the third normal switch, indicating that the initialization state is actually single-cylinder mode; and that the variable displacement mechanism is currently in a normal state.

[0141] In some other embodiments of this disclosure, when the first mode (initialization mode) is a single-cylinder mode, both the first switching command and the third switching command are dual-cylinder mode commands, wherein the dual-cylinder mode command includes controlling the high-pressure solenoid valve to open and the low-pressure solenoid valve to close.

[0142] Based on the first abnormal switch (single-cylinder mode to dual-cylinder mode) and the second normal switch (dual-cylinder mode to single-cylinder mode) in the above embodiments of this disclosure, a third switch (single-cylinder mode to dual-cylinder mode) is added. Therefore, the above embodiments of this disclosure can quickly, accurately, and reliably determine whether the variable displacement mechanism of the dual-cylinder mode is currently stuck due to an initialization anomaly. Specifically, the above embodiments of this disclosure can quickly, accurately, and reliably determine the initialization anomaly of the dual-cylinder mode by detecting the first abnormal switch, the second normal switch, and the third abnormal switch, indicating that the initialization state is actually single-cylinder mode; and that the variable displacement mechanism is currently stuck in the single-cylinder mode state, and control the compressor to operate in the single-cylinder mode. The above embodiments of this disclosure can quickly, accurately, and reliably determine the initialization anomaly of the dual-cylinder mode by detecting the first abnormal switch, the second normal switch, and the third normal switch, indicating that the initialization state is actually single-cylinder mode; and that the variable displacement mechanism is currently in a normal state.

[0143] In step 743, the fault type of the variable capacitance mechanism is determined based on whether the third current change value is greater than a predetermined threshold.

[0144] Based on the first switching failure and the second switching success, the above embodiments of this disclosure add a third switching (from the first mode to the second mode). Therefore, the above embodiments of this disclosure can quickly, accurately and reliably determine whether the variable capacity mechanism with initialization failure is currently stuck.

[0145] In some embodiments of this disclosure, step 743 may include: if the third current change value is greater than a predetermined threshold, determining that the variable capacitance mechanism is abnormally started in the first mode, and determining that the current state of the variable capacitance mechanism is normal.

[0146] In the above embodiments of this disclosure, under the circumstances of abnormal initialization of the first mode, normal initialization of the second mode, and normal third mode (from the first mode to the second mode), the initialization state is actually the second mode; and by the normal second and third modes, the current state of the variable capacity mechanism is determined to be normal.

[0147] In some other embodiments of this disclosure, step 743 may include: if the third current change value is not greater than a predetermined threshold, determining that the variable capacity mechanism is abnormally started in the first mode, determining that the variable capacity mechanism is currently stuck in the first mode state, and controlling the compressor to operate in the first mode.

[0148] In the above embodiments of this disclosure, under the circumstances of the first switching failure, the second switching normal, and the third switching (from the first mode to the second mode) failure, the initialization failure of the first mode can be quickly, accurately, and reliably determined, and the initialization state is actually the second mode; and by the second switching normal and the third switching failure, the variable capacity mechanism can be quickly, accurately, and reliably determined to be stuck in the first mode state, and the compressor can be controlled to operate according to the first mode.

[0149] Figure 4 This is a schematic diagram of some embodiments of the compressor variable displacement mechanism fault detection method disclosed herein. Figure 4 The embodiments can be performed by the compressor variable displacement mechanism fault detection device or the compressor variable displacement mechanism fault detection system of this disclosure, or the compressor or electrical equipment of this disclosure. The compressor variable displacement mechanism fault detection method of this disclosure may include, in addition to... Figure 1 Implementation examples or Figure 3 In addition to the method steps in the embodiments, it may also include Figure 4 At least one of steps 800, 900 and 910 in the embodiment.

[0150] In step 800, the fault code and fault type of the compressor are reported, wherein the fault type includes at least one of the following: the variable displacement mechanism is stuck in a single cylinder state, the variable displacement mechanism is stuck in a dual cylinder state, the variable displacement mechanism is abnormally started according to the first mode, the variable displacement mechanism is abnormally started according to the first mode and the current state is normal, and the variable displacement mechanism is abnormally started according to the first mode and is currently stuck in the first mode state.

[0151] The embodiments described above can prompt maintenance personnel to check the variable displacement mechanism (variable displacement valve) by reporting the specific fault code and corresponding fault type of the compressor. This allows maintenance personnel to handle the faults according to different fault types, thereby improving the efficiency of fault handling and enhancing the user experience for maintenance personnel.

[0152] In step 900, when the variable displacement mechanism is stuck in a single-cylinder state, the maximum operating frequency of the compressor is limited.

[0153] In some embodiments of this disclosure, step 900 may include: reporting a fault and stopping the machine directly when the variable displacement mechanism is stuck in a single cylinder state.

[0154] The embodiments disclosed above can prevent user complaints due to insufficient capacity by limiting the compressor's maximum operating frequency when the variable displacement mechanism is stuck in a single cylinder state, through degraded operation of the compressor.

[0155] In step 910, when the variable displacement mechanism is stuck in the dual-cylinder state, the minimum operating frequency of the compressor is limited.

[0156] In some embodiments of this disclosure, step 900 may include: limiting the minimum operating frequency of the compressor and adjusting the expansion valve control strategy when the variable displacement mechanism is stuck in the dual-cylinder state.

[0157] The embodiments disclosed above can prevent abnormal system pressure or low energy efficiency during low-load operation by limiting the minimum operating frequency of the compressor and adjusting the expansion valve control strategy when the variable displacement mechanism is stuck in the dual-cylinder state.

[0158] Figure 5 This is a schematic diagram of some embodiments of the compressor variable displacement mechanism fault detection method disclosed herein. Figure 5 The embodiments may be performed by the compressor variable capacity mechanism fault detection device or the compressor variable capacity mechanism fault detection system or the compressor or electrical equipment of the present disclosure. Figure 5 In this embodiment, the first mode (initialization mode) is a dual-cylinder mode. For example... Figure 5 As shown, Figure 5 The method of the embodiment may include at least one of steps 1 to 5.

[0159] In step 1, the air conditioner is started and a steady state is established.

[0160] In some embodiments of this disclosure, step 1 can be implemented as follows: Figure 1 or Figure 3 Step 100 in the embodiment.

[0161] In some embodiments of this disclosure, step 1 may include: the air conditioner receives a start-up command, the compressor starts and increases its frequency to the test frequency F (e.g., 40Hz); during this process, the control pause is performed according to the capacity requirements, the opening of the electronic expansion valve is locked, and the outdoor fan speed is fixed; wait for a first predetermined time T1 (e.g., 30 seconds) until the speed stabilizes and the lubricating oil film is established. (At this time, the system defaults to driving the solenoid valve according to the "dual-cylinder mode" command).

[0162] In some embodiments of this disclosure, both the high-pressure and low-pressure valves should be closed during the previous shutdown. During startup, the high-pressure valve is directly energized while the low-pressure valve is de-energized, and the system is initialized in dual-cylinder mode. Because the state of the solenoid valve is unreliable after the power-off process, an initialization action is required to reset the valve state to a definite state.

[0163] In step 2, the first switching test (two-cylinder -> single-cylinder) is conducted.

[0164] In some embodiments of this disclosure, step 2 may include Figure 1 or Figure 3 Steps 200 and 300 in the embodiments, and Figure 1 Step 400 of the embodiment.

[0165] In some embodiments of this disclosure, step 2 may include at least one of steps 21 to 24.

[0166] In step 21, the control system records the current average operating current.

[0167] In step 22, a "single cylinder mode" command is issued (operating the solenoid valve to close the high-pressure side solenoid valve and open the low-pressure side solenoid valve).

[0168] In step 23, the real-time current is continuously monitored during the subsequent predetermined time period.

[0169] In some embodiments of this disclosure, the predetermined time period can be a time window T2.

[0170] In some embodiments of this disclosure, the predetermined time period can be 5 seconds.

[0171] In step 24, the judgment logic A is executed: calculate the current drop value (i.e., the first current change value); if the current drop value exceeds the preset threshold (i.e., the current drops suddenly), such as 1.5A, then the "unloading action is successful" is determined, and the valve and slide are not stuck; otherwise, if the current drop value does not exceed the preset threshold (i.e., the current does not drop suddenly), then the first action is determined to be a failure.

[0172] In some embodiments of this disclosure, the initial failure may be due to a faulty valve.

[0173] In some embodiments of this disclosure, the initial failure may also be due to the compressor being stuck in a single-cylinder state from the beginning. In step 1, the initialization state is dual-cylinder, meaning the high-pressure valve is energized and the low-pressure valve is de-energized. If the initial state is single-cylinder, it indicates that the variable displacement compressor initialization process has failed, which is an abnormal state. That is, the initialization to dual-cylinder failed.

[0174] In step 3, the second switching test (single cylinder -> dual cylinder) is conducted.

[0175] In some embodiments of this disclosure, step 3 may include Figure 3 At least one of steps 500 to 700 in the embodiments.

[0176] In some embodiments of this disclosure, step 3 may include at least one of steps 31 to 34.

[0177] In step 31, the test frequency F is kept constant.

[0178] In step 32, a "dual-cylinder mode" command is issued (operating solenoid valve reset, closing the low-pressure side solenoid valve, and opening the high-pressure side solenoid valve).

[0179] In step 33, the real-time current is monitored during the subsequent predetermined time period (time window T2).

[0180] In step 34, the judgment logic B is executed: calculate the current ramp-up value (i.e., the second current change value); if the second current change value exceeds the preset threshold, the "loading action is successful" is determined; otherwise, if the second current change value does not exceed the preset threshold, the second action is determined to have failed and the solenoid valve is faulty.

[0181] In step 4, comprehensive fault arbitration is performed according to Table 1.

[0182] Table 1

[0183] In some embodiments of this disclosure, in Table 1, a sudden drop in current refers to a first current change value being greater than a predetermined threshold, and no sudden drop in current refers to a first current change value not being greater than a predetermined threshold; a sudden rise in current refers to a second current change value being greater than a predetermined threshold, and no sudden rise in current refers to a second current change value not being greater than a predetermined threshold.

[0184] In some embodiments of this disclosure, as shown in Table 1, if the result of the first test, i.e., the test result of switching from a dual-cylinder to a single-cylinder in step 2, is that the current does not suddenly drop; and the result of the second test, i.e., the test result of switching from a single-cylinder to a dual-cylinder in step 3, is that the current suddenly rises; then it is determined that the dual-cylinder state during the initialization process is abnormal, i.e., the process from all valves being closed during shutdown to the high-pressure valve being energized and the low-pressure valve being de-energized during initialization is abnormal. Shutdown should ideally result in all valves being closed, but because there is no power and the solenoid valve does not have a return spring, the actual state is uncertain.

[0185] In step 5, a comprehensive diagnosis and subsequent treatment are performed.

[0186] In some embodiments of this disclosure, step 5 may include Figure 3 Step 700 in the embodiment Figure 4 At least one of steps 800 to 910 in the embodiment.

[0187] In some embodiments of this disclosure, step 5 may include: performing a comprehensive diagnosis and subsequent processing based on Table 1.

[0188] In some embodiments of this disclosure, step 5 may include: making the final determination of steps 51 and 52 based on the current feedback from the two actions in steps 2 and 3.

[0189] In step 51, scenario A (normal): the expected current step change is detected in both switching. Then it is determined that the variable capacitance mechanism is functioning properly, exits the self-test mode, and runs according to the normal logic set by the user (unlocks the frequency and enters PID (proportional integral derivative) regulation).

[0190] In step 52, scenario B (fault): No current step is detected during any switching. It is determined that the variable capacity solenoid valve or the sliding vane is stuck, indicating a compressor fault, and the countermeasures in steps (1) and (2) are executed.

[0191] Step (1), report the fault code: prompt the maintenance personnel to check the variable capacity valve.

[0192] Step (2), downgrade operation.

[0193] In some embodiments of this disclosure, step (2) may include at least one of steps (2-1) and (2-2).

[0194] Step (2-1): If it is determined that the compressor is stuck in a single cylinder state: limit the maximum operating frequency of the compressor to prevent user complaints due to insufficient capacity (or directly report a fault and shut down).

[0195] Step (2-2): If it is determined that the system is stuck in the dual-cylinder state: By limiting the minimum operating frequency of the compressor and adjusting the expansion valve control strategy, abnormal system pressure or low energy efficiency can be prevented when operating at low load.

[0196] Figure 6 This is a schematic diagram of some other embodiments of the compressor variable displacement mechanism fault detection method disclosed herein. Figure 6 The embodiments may be performed by the compressor variable capacity mechanism fault detection device or the compressor variable capacity mechanism fault detection system or the compressor or electrical equipment of the present disclosure. Figure 6 In this embodiment, the first mode (initialization mode) is a single-cylinder mode. For example... Figure 6 As shown, Figure 6 The method of the embodiment may include at least one of steps 61 to 65. Figure 6 Steps 61 to 65 of the embodiment are respectively with Figure 5 Steps 1 to 5 of the embodiment are the same or similar.

[0197] In step 61, the air conditioner is started and a steady state is established.

[0198] In some embodiments of this disclosure, step 61 can be implemented as follows: Figure 1 or Figure 3 Step 100 in the embodiment.

[0199] In some embodiments of this disclosure, step 61 may include: the air conditioner receiving a start-up command, the compressor starting and increasing its frequency to the test frequency F (e.g., 40Hz); during this process, control is paused according to capacity requirements, the electronic expansion valve opening is locked, and the outdoor fan speed is fixed; waiting for a first predetermined time T1 (e.g., 30 seconds) until the speed stabilizes and a lubricating oil film is established. (At this time, the system defaults to driving the solenoid valve according to the "single cylinder mode" command).

[0200] In some embodiments of this disclosure, both the high-pressure and low-pressure valves should be closed during the previous shutdown. During startup, the high-pressure valve is directly de-energized and the low-pressure valve is energized, and the system is initialized in single-cylinder mode. Because the state of the solenoid valve is unreliable after the power-off process, an initialization action is required to reset the valve state to a definite state.

[0201] In step 62, the first switching test (single cylinder -> dual cylinder) is performed.

[0202] In some embodiments of this disclosure, step 62 may include Figure 1 or Figure 3 Steps 200 and 300 in the embodiments, and Figure 1 Step 400 of the embodiment.

[0203] In some embodiments of this disclosure, step 62 may include at least one of steps 621 to 624.

[0204] In step 621, the control system records the current average operating current.

[0205] In step 622, a "dual-cylinder mode" command is issued (operating the solenoid valve to close the low-pressure side solenoid valve and open the high-pressure side solenoid valve).

[0206] In step 623, the real-time current is continuously monitored during a subsequent predetermined time period.

[0207] In some embodiments of this disclosure, the predetermined time period can be a time window T2.

[0208] In some embodiments of this disclosure, the predetermined time period can be 5 seconds.

[0209] In step 624, the judgment logic A is executed: calculate the current creep value (i.e., the first current change value); if the current creep value exceeds the preset threshold (i.e., the current surge), such as 1.5A, then it is determined that "the loading action is successful" and the valve and slide plate are not stuck; otherwise, if the current creep value does not exceed the preset threshold (i.e., the current does not surge), then the first action is determined to be a failure.

[0210] In some embodiments of this disclosure, the initial failure may be due to a faulty valve.

[0211] In some embodiments of this disclosure, the initial failure may also be due to the compressor being stuck in a dual-cylinder configuration from the beginning. In step 61, the initial state is single-cylinder, meaning the high-pressure valve is de-energized and the low-pressure valve is energized. If the initial state is dual-cylinder, it indicates that the variable displacement compressor initialization process has failed, which is an abnormal state. That is, initialization to single-cylinder failed.

[0212] In step 63, the second switching test (dual cylinder -> single cylinder) is performed.

[0213] In some embodiments of this disclosure, step 63 may include Figure 3 At least one of steps 500 to 700 in the embodiments.

[0214] In some embodiments of this disclosure, step 63 may include at least one of steps 631 to 634.

[0215] In step 631, the test frequency F is kept constant.

[0216] In step 632, a "single cylinder mode" command is issued (operating solenoid valve reset, closing the high-pressure side solenoid valve, and opening the low-pressure side solenoid valve).

[0217] In step 33, the real-time current is monitored during the subsequent predetermined time period (time window T2).

[0218] In step 34, the judgment logic B is executed: calculate the current drop value (i.e., the second current change value); if the second current change value exceeds the preset threshold, the "unloading action is successful" is determined; otherwise, if the current drop value does not exceed the preset threshold, the second action is determined to have failed and the solenoid valve is faulty.

[0219] In step 4, comprehensive fault arbitration is performed according to Table 2.

[0220] Table 2

[0221] In some embodiments of this disclosure, in Table 2, a sudden drop in current refers to a second current change value being greater than a predetermined threshold, and no sudden drop in current refers to a second current change value not being greater than a predetermined threshold; a sudden rise in current refers to a first current change value being greater than a predetermined threshold, and no sudden rise in current refers to a first current change value not being greater than a predetermined threshold.

[0222] In some embodiments of this disclosure, as shown in Table 2, if the result of the first test, i.e., the test result of switching from a single cylinder to a dual cylinder in step 62, is: no sudden increase in current; and the result of the second test, i.e., the test result of switching from a single cylinder to a dual cylinder in step 63, is: a sudden drop in current, then it is determined that the single-cylinder state during the initialization process is abnormal, i.e., the process from all valves closing during shutdown to the high-pressure valve losing power and the low-pressure valve gaining power during initialization is abnormal. Shutdown should ideally result in all valves being closed, but because there is no power and the solenoid valve does not have a return spring, the actual state is uncertain.

[0223] In step 65, a comprehensive diagnosis and subsequent treatment are performed.

[0224] In some embodiments of this disclosure, step 65 may include Figure 3 Step 700 in the embodiment Figure 4 At least one of steps 800 to 910 in the embodiment.

[0225] In some embodiments of this disclosure, step 65 may include: performing a comprehensive diagnosis and subsequent processing based on Table 6.

[0226] In some embodiments of this disclosure, step 65 may include: making the final determination of steps 651 and 652 based on the current feedback from the two actions of steps 62 and 63.

[0227] In step 651, under scenario A (normal): the expected current step change is detected in both switching operations. Therefore, the variable capacitance mechanism is deemed to be functioning correctly, exits self-test mode, and operates according to the user-defined normal logic (unlocking frequency and entering PID regulation).

[0228] In step 652, scenario B (fault): No current step is detected during any switching. It is determined that the variable capacity solenoid valve or the sliding vane is stuck, indicating a compressor fault, and the countermeasures in steps (1) and (2) are executed.

[0229] Step (1), report the fault code: prompt the maintenance personnel to check the variable capacity valve.

[0230] Step (2), downgrade operation.

[0231] In some embodiments of this disclosure, step (2) may include at least one of steps (2-1) and (2-2).

[0232] Step (2-1): If it is determined that the compressor is stuck in a single cylinder state: limit the maximum operating frequency of the compressor to prevent user complaints due to insufficient capacity (or directly report a fault and shut down).

[0233] Step (2-2): If it is determined that the system is stuck in the dual-cylinder state: limit the minimum operating frequency of the compressor and adjust the expansion valve control strategy to prevent abnormal system pressure or low energy efficiency during low-load operation.

[0234] Figure 7 These are schematic diagrams of some embodiments of the compressor variable displacement mechanism fault detection device disclosed herein. Figure 7 As shown, the compressor variable capacity mechanism fault detection device disclosed herein may include a control module 71, a command sending module 72, a current change value acquisition module 73, and a fault detection module 74.

[0235] The control module 71 is configured to control the compressor to start in the first mode and increase the frequency to the test frequency, and to obtain the reference current after the compressor is running stably. The compressor's variable capacity mechanism has no return spring, and the first mode is a dual-cylinder mode or a single-cylinder mode.

[0236] The instruction sending module 72 is configured to send a first switching instruction to the compressor to control the compressor to switch from the first mode to the second mode, wherein the second mode is the reverse mode of the first mode, and the dual-cylinder mode and the single-cylinder mode are the reverse modes of each other.

[0237] The current change value acquisition module 73 is configured to acquire the first current change value within a predetermined time period after the first switching command is sent.

[0238] The fault detection module 74 is configured to determine whether the variable capacity mechanism is faulty based on whether the first current change value is greater than a predetermined threshold.

[0239] In some embodiments of this disclosure, the instruction sending module 72 may also be configured to send a second switching instruction to the compressor to control the compressor to switch from the second mode to the first mode.

[0240] In some embodiments of this disclosure, the current change value acquisition module 73 may also be configured to acquire a second current change value within a predetermined time period after the second switching instruction is sent.

[0241] In some embodiments of this disclosure, the fault detection module 74 may also be configured to determine whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold.

[0242] In some embodiments of this disclosure, when the fault detection module 74 determines whether the variable capacity mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold, it can be configured to determine that the variable capacity mechanism is stuck when both the first current change value and the second current change value are not greater than a predetermined threshold; obtain the current value of the compressor; and determine whether the variable capacity mechanism is stuck in a single-cylinder state or a dual-cylinder state based on the current value.

[0243] In some embodiments of this disclosure, when the fault detection module 74 determines whether the variable capacity mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold, it can be configured to determine that the variable capacity mechanism is stuck in the second mode state when the first current change value is greater than the predetermined threshold and the second current change value is not greater than the predetermined threshold, and control the compressor to operate in the second mode.

[0244] In some embodiments of this disclosure, when the fault detection module 74 determines whether the variable capacity mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold, it can be configured to determine that the variable capacity mechanism is abnormally started in the first mode and control the compressor to operate in the first mode when the first current change value is not greater than the predetermined threshold and the second current change value is greater than the predetermined threshold.

[0245] In other embodiments of this disclosure, when the fault detection module 74 determines whether the variable capacity mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold, it can be configured to determine that the variable capacity mechanism is abnormally started in the first mode when the first current change value is not greater than the predetermined threshold and the second current change value is greater than the predetermined threshold, send a third switching command to the compressor, and control the compressor to switch from the first mode to the second mode; obtain a third current change value within a predetermined time period after sending the third switching command; and determine the fault type of the variable capacity mechanism based on whether the third current change value is greater than the predetermined threshold.

[0246] In some embodiments of this disclosure, when the fault detection module 74 determines the fault type of the variable capacitance mechanism based on whether the third current change value is greater than a predetermined threshold, it can be configured to determine that the variable capacitance mechanism is abnormally started in the first mode and determine that the current state of the variable capacitance mechanism is normal when the third current change value is greater than the predetermined threshold.

[0247] In some other embodiments of this disclosure, when the fault detection module 74 determines the fault type of the variable capacity mechanism based on whether the third current change value is greater than a predetermined threshold, it can be configured to determine that the variable capacity mechanism is abnormally started in the first mode when the third current change value is not greater than the predetermined threshold, determine that the variable capacity mechanism is currently stuck in the first mode state, and control the compressor to operate in the first mode.

[0248] In some embodiments of this disclosure, the compressor is a dual-valve, dual-cylinder variable-capacity compressor, and the compressor includes a high-pressure solenoid valve and a low-pressure solenoid valve.

[0249] In some embodiments of this disclosure, when the first mode is a dual-cylinder mode, both the first switching command and the third switching command are single-cylinder mode commands, and both the second switching command are dual-cylinder mode commands.

[0250] In some embodiments of this disclosure, when the first mode is a single-cylinder mode, the first switching command and the third switching command are both dual-cylinder mode commands, and the second switching command is a single-cylinder mode command.

[0251] In some embodiments of this disclosure, the single-cylinder mode command includes controlling the high-pressure solenoid valve to close and the low-pressure solenoid valve to open.

[0252] In some embodiments of this disclosure, the dual-cylinder mode command includes controlling the high-pressure solenoid valve to open and the low-pressure solenoid valve to close.

[0253] In some embodiments of this disclosure, the compressor variable displacement mechanism fault detection device may also be configured to report the compressor's fault code and fault type, wherein the fault type includes at least one of the following: the variable displacement mechanism is stuck in a single-cylinder state, the variable displacement mechanism is stuck in a dual-cylinder state, the variable displacement mechanism starts abnormally according to a first mode, the variable displacement mechanism starts abnormally according to a first mode and is currently in a normal state, and the variable displacement mechanism starts abnormally according to a first mode and is currently stuck in the first mode state.

[0254] In some embodiments of this disclosure, the compressor variable displacement mechanism fault detection device may also be configured to perform at least one of the following operations: limiting the maximum operating frequency of the compressor when the variable displacement mechanism is stuck in a single-cylinder state; and limiting the minimum operating frequency of the compressor when the variable displacement mechanism is stuck in a dual-cylinder state.

[0255] In some embodiments of this disclosure, when the fault detection module 74 determines whether the variable capacity mechanism is faulty based on whether the first current change value is greater than a predetermined threshold and whether the second current change value is greater than a predetermined threshold, it can be configured to determine that the variable capacity mechanism is functionally intact and the compressor is fault-free when both the first current change value and the second current change value are greater than a predetermined threshold.

[0256] In some embodiments of this disclosure, the compressor variable displacement mechanism fault detection device of this disclosure can also be configured to implement the compressor variable displacement mechanism fault detection method as described in any of the above embodiments.

[0257] Figure 8 These are schematic diagrams illustrating the structure of some other embodiments of the compressor variable displacement mechanism fault detection device disclosed herein. For example... Figure 8 As shown, the compressor variable displacement mechanism fault detection device disclosed herein may include a memory 81 and a processor 82.

[0258] The memory 81 is used to store instructions, and the processor 82 is coupled to the memory 81. The processor 82 is configured to execute instructions stored in the memory to implement the compressor variable displacement mechanism fault detection method involved in the above embodiments.

[0259] like Figure 8 As shown, the compressor variable displacement mechanism fault detection device also includes a communication interface 83 for information exchange with other devices. Simultaneously, the compressor variable displacement mechanism fault detection device also includes a bus 84, through which the processor 82, communication interface 83, and memory 81 communicate with each other.

[0260] The memory 81 may include high-speed RAM, and may also include non-volatile memory, such as at least one disk drive. The memory 81 may also be a memory array. The memory 81 may also be divided into blocks, and these blocks may be combined into virtual volumes according to certain rules.

[0261] Furthermore, processor 82 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present disclosure.

[0262] Figure 9 These are schematic diagrams of some embodiments of the compressor variable displacement mechanism fault detection system disclosed herein. Figure 9 As shown, the compressor variable capacity mechanism fault detection system disclosed herein may include a compressor variable capacity mechanism fault detection device 91 and a current acquisition device 92.

[0263] The compressor variable capacity mechanism fault detection device 91 is configured to control the compressor to start in a first mode and increase the frequency to the test frequency, obtain the reference current after the compressor is running stably, wherein the variable capacity mechanism of the compressor has no return spring; send a first switching command to the compressor to control the compressor to switch from the first mode to a second mode; obtain a first current change value within a predetermined time period after sending the first switching command; and determine whether the variable capacity mechanism is faulty based on whether the first current change value is greater than a predetermined threshold.

[0264] In some embodiments of this disclosure, the compressor variable displacement mechanism fault detection device 91 can be the compressor variable displacement mechanism fault detection device as described in any of the above embodiments.

[0265] The current acquisition device 92 is configured to acquire the compressor current according to the indication of the compressor variable capacity mechanism fault detection device 91.

[0266] According to another aspect of this disclosure, a compressor is provided, including a compressor variable displacement mechanism fault detection system as described in any of the above embodiments.

[0267] According to another aspect of this disclosure, an electrical device is provided, including a compressor as described in any of the above embodiments.

[0268] In some embodiments of this disclosure, the electrical equipment may be household appliances such as air conditioners and refrigerators.

[0269] The above embodiments of this disclosure provide a valve fault detection method, device, and air conditioner for a variable displacement compressor without a return spring, which can perform rapid diagnosis and complete the detection within the first few minutes of air conditioner startup without waiting for system thermal equilibrium.

[0270] The valve fault detection method of the above embodiments of this disclosure has high reliability. Compared with temperature / pressure parameters, the signal-to-noise ratio of the current signal is high and it is not affected by ambient temperature and humidity.

[0271] The valve fault detection method of the above embodiments of this disclosure greatly improves system safety. It can identify valves stuck in a "false dual-cylinder" or "false single-cylinder" state, thereby correcting the control logic and avoiding compressor overheating or liquid return damage caused by flow mismatch.

[0272] The hardware cost of the above embodiments disclosed is low. They are implemented using software logic control plus the existing hardware (current acquisition device) of the air conditioner, without the need to add additional pressure sensors or displacement sensors.

[0273] According to another aspect of this disclosure, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, it implements the compressor variable displacement mechanism fault detection method as described in any of the above embodiments.

[0274] According to another aspect of this disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions that, when executed by a processor, implement the compressor variable displacement mechanism fault detection method as described in any of the above embodiments.

[0275] The computer-readable storage medium disclosed herein can be implemented as a non-transitory computer-readable storage medium.

[0276] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, apparatus, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0277] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0278] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0279] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0280] The compressor variable capacity mechanism fault detection device, control module, instruction sending module, current change value acquisition module and fault detection module described above can be implemented as a general-purpose processor, programmable logic controller, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any suitable combination thereof for performing the functions described in this disclosure.

[0281] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments of this disclosure can be implemented in hardware. The hardware can be implemented as a general-purpose processor, programmable logic controller, digital signal processor, application-specific integrated circuit, field-programmable gate array or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any suitable combination thereof for executing the methods of this disclosure.

[0282] This concludes the detailed description of the present disclosure. To avoid obscuring the concept of the disclosure, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0283] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware, or by a program instructing the relevant hardware to implement them. The program can be stored in a non-transitory computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0284] The description in this disclosure is provided for illustrative and descriptive purposes only and is not intended to be exhaustive or to limit the disclosure to its forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of this disclosure and to enable those skilled in the art to understand this disclosure and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A method for detecting faults in a compressor variable displacement mechanism, comprising: The compressor is controlled to start in the first mode and increase the frequency to the test frequency to obtain the reference current after the compressor is running stably. The compressor's variable capacity mechanism has no return spring, and the first mode is a dual-cylinder mode or a single-cylinder mode. A first switching command is sent to the compressor to control the compressor to switch from the first mode to the second mode, wherein the second mode is the reverse mode of the first mode, and the dual-cylinder mode and the single-cylinder mode are the reverse modes of each other; Obtain the first current change value within a predetermined time period after sending the first switching instruction; Whether the variable capacitance mechanism is faulty is determined based on whether the first current change value is greater than a predetermined threshold. The step of determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than a predetermined threshold includes: Send a second switching command to the compressor to control the compressor to switch from the second mode to the first mode; Obtain the second current change value within the predetermined time period after sending the second switching command; The malfunction of the variable capacity mechanism is determined based on whether the first current change value is greater than the predetermined threshold and whether the second current change value is greater than the predetermined threshold.

2. The compressor variable displacement mechanism fault detection method according to claim 1, wherein, The step of determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than the predetermined threshold and whether the second current change value is greater than the predetermined threshold includes: If the first current change value is not greater than the predetermined threshold and the second current change value is not greater than the predetermined threshold, the variable capacitance mechanism is determined to be stuck. Obtain the current value of the compressor; Based on the current value, it is determined whether the variable displacement mechanism is stuck in the single-cylinder state or the dual-cylinder state.

3. The compressor variable displacement mechanism fault detection method according to claim 1, wherein, The step of determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than the predetermined threshold and whether the second current change value is greater than the predetermined threshold includes: If the first current change value is greater than the predetermined threshold and the second current change value is not greater than the predetermined threshold, it is determined that the variable capacity mechanism is stuck in the second mode state, and the compressor is controlled to operate in the second mode.

4. The compressor variable displacement mechanism fault detection method according to any one of claims 1 to 3, wherein, The step of determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than the predetermined threshold and whether the second current change value is greater than the predetermined threshold includes: If the first current change value is not greater than the predetermined threshold and the second current change value is greater than the predetermined threshold, it is determined that the variable capacity mechanism is abnormally started in the first mode, and the compressor is controlled to operate in the first mode.

5. The method for detecting faults in the compressor variable displacement mechanism according to any one of claims 1 to 3, wherein, The step of determining whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than the predetermined threshold and whether the second current change value is greater than the predetermined threshold includes: If the first current change value is not greater than the predetermined threshold and the second current change value is greater than the predetermined threshold, it is determined that the variable capacity mechanism is abnormally started in the first mode, and a third switching command is sent to the compressor to control the compressor to switch from the first mode to the second mode. Obtain the third current change value within a predetermined time period after sending the third switching command; The fault type of the variable capacitance mechanism is determined based on whether the third current change value is greater than the predetermined threshold.

6. The compressor variable displacement mechanism fault detection method according to claim 5, wherein, Determining the fault type of the variable capacitance mechanism based on whether the third current change value is greater than the predetermined threshold includes at least one of the following steps: If the third current change value is greater than the predetermined threshold, it is determined that the variable capacitance mechanism is abnormally started in the first mode, and the current state of the variable capacitance mechanism is determined to be normal. If the change value of the third current is not greater than the predetermined threshold, it is determined that the variable capacity mechanism is abnormally started in the first mode, and it is determined that the variable capacity mechanism is currently stuck in the first mode state, and the compressor is controlled to operate in the first mode.

7. The compressor variable displacement mechanism fault detection method according to claim 5, wherein: The compressor is a dual-valve, dual-cylinder variable-capacity compressor, which includes a high-pressure solenoid valve and a low-pressure solenoid valve. When the first mode is the dual-cylinder mode, the first switching command and the third switching command are both single-cylinder mode commands, and the second switching command is both dual-cylinder mode commands; the single-cylinder mode command includes controlling the high-pressure solenoid valve to close and the low-pressure solenoid valve to open; the dual-cylinder mode command includes controlling the high-pressure solenoid valve to open and the low-pressure solenoid valve to close.

8. The compressor variable displacement mechanism fault detection method according to claim 5, wherein: The compressor is a dual-valve, dual-cylinder variable-capacity compressor, which includes a high-pressure solenoid valve and a low-pressure solenoid valve. When the first mode is the single-cylinder mode, the first switching command and the third switching command are both dual-cylinder mode commands, and the second switching command is a single-cylinder mode command; the single-cylinder mode command includes controlling the high-pressure solenoid valve to close and the low-pressure solenoid valve to open; the dual-cylinder mode command includes controlling the high-pressure solenoid valve to open and the low-pressure solenoid valve to close.

9. The compressor variable displacement mechanism fault detection method according to any one of claims 1 to 3 further includes: Report the fault code and fault type of the compressor, wherein the fault type includes at least one of the following: the variable displacement mechanism is stuck in the single cylinder state, the variable displacement mechanism is stuck in the dual cylinder state, the variable displacement mechanism is abnormally started in the first mode, the variable displacement mechanism is abnormally started in the first mode and is currently in normal state, and the variable displacement mechanism is abnormally started in the first mode and is currently stuck in the first mode state.

10. The compressor variable displacement mechanism fault detection method according to any one of claims 1 to 3, further comprising at least one of the following steps: When the variable displacement mechanism is stuck in the single cylinder state, the maximum operating frequency of the compressor is limited; When the variable displacement mechanism is stuck in the dual-cylinder state, the minimum operating frequency of the compressor is limited.

11. A fault detection device for a compressor variable displacement mechanism, comprising: The control module is configured to control the compressor to start in a first mode and increase the frequency to the test frequency, and to obtain the reference current after the compressor is running stably. The compressor's variable capacity mechanism has no return spring, and the first mode is a dual-cylinder mode or a single-cylinder mode. The instruction sending module is configured to send a first switching instruction to the compressor to control the compressor to switch from the first mode to the second mode, wherein the second mode is the reverse mode of the first mode, and the dual-cylinder mode and the single-cylinder mode are the reverse modes of each other; The current change value acquisition module is configured to acquire the first current change value within a predetermined time period after the first switching instruction is sent. The fault detection module is configured to determine whether the variable capacitance mechanism is faulty based on whether the first current change value is greater than a predetermined threshold. The instruction sending module is also configured to send a second switching instruction to the compressor to control the compressor to switch from the second mode to the first mode; The current change value acquisition module is also configured to acquire the second current change value within the predetermined time period after the second switching command is sent; The fault detection module is also configured to determine whether the variable capacity mechanism is faulty based on whether the first current change value is greater than the predetermined threshold and whether the second current change value is greater than the predetermined threshold.

12. A fault detection device for a compressor variable displacement mechanism, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the compressor variable displacement mechanism fault detection method as described in any one of claims 1 to 10, based on instructions stored in the memory.

13. A fault detection system for a compressor variable displacement mechanism, comprising: The compressor variable displacement mechanism fault detection device as described in claim 11 or 12; The current acquisition device is configured to acquire the compressor current based on the indication of the compressor variable capacity mechanism fault detection device.

14. A compressor, comprising the compressor variable displacement mechanism fault detection system as described in claim 13.

15. An electrical appliance comprising the compressor as claimed in claim 14.

16. A computer-readable storage medium, wherein, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the compressor variable displacement mechanism fault detection method as described in any one of claims 1 to 10.

17. A computer program product comprising a computer program, wherein, When the computer program is executed by the processor, it implements the compressor variable displacement mechanism fault detection method as described in any one of claims 1 to 10.

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