Compressor and diagnostic method, device, readable storage medium and vehicle thereof

Abstract

The application provides a compressor and a diagnosis method, device, readable storage medium and vehicle thereof. The diagnosis method comprises: periodically acquiring a first temperature value of a power device and a second temperature value of a non-power device; determining a first temperature difference value according to the first temperature value and the second temperature value; determining a temperature rise rate according to the first temperature difference value and a calculation period; in the case that the temperature rise rate is less than a preset value, determining a diagnosis result of the compressor according to a comparison result of the first temperature difference value and a preset temperature difference value; wherein the preset temperature difference value is a temperature difference value of the power device and the non-power device when the compressor is fault-free.

Description

Technical Field

[0001] This invention relates to the field of control technology, and more specifically, to a compressor and its diagnostic method, apparatus, readable storage medium, and vehicle. Background Technology

[0002] A compressor is a product that combines mechanical components, a motor, and an electronic control system. During operation, it may experience malfunctions such as pump body wear, broken teeth, lack of oil, bearing wear, motor insulation failure, damage to electronic control components, and deterioration of thermal conductivity.

[0003] In related technical solutions, additional sensors are installed in the compressor to detect faults by using the sensor data. For example, Fourier transform is performed on the data to analyze the changes in the corresponding frequency characteristics and thus determine the damage to the corresponding compressor components. However, the above fault diagnosis scheme requires a large amount of computation and has high hardware requirements. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, a first aspect of the present invention is to provide a method for diagnosing a compressor.

[0006] A second aspect of the present invention is that a diagnostic device for a compressor is provided.

[0007] A third aspect of the invention is that it provides another diagnostic device for compressors.

[0008] A fourth aspect of the present invention is that a readable storage medium is provided.

[0009] A fifth aspect of the present invention is that a compressor is provided.

[0010] A sixth aspect of the invention is that a vehicle is provided.

[0011] In view of the above, according to a first aspect of the present invention, the present invention provides a method for diagnosing a compressor, the compressor including an electronic control board, the electronic control board having power devices and non-power devices arranged thereon, the diagnostic method including: periodically acquiring a first temperature value of the power devices and a second temperature value of the non-power devices; determining a first temperature difference based on the first temperature value and the second temperature value; determining a temperature rise rate based on the first temperature difference and a calculation period; and determining a diagnostic result of the compressor based on a comparison result between the first temperature difference and a preset temperature difference when the temperature rise rate is less than a preset value; wherein, the preset temperature difference is the temperature difference between the power devices and the non-power devices when the compressor is fault-free.

[0012] This technical solution proposes a compressor diagnostic method. By running this diagnostic method, compressor fault detection can be achieved. In the above diagnostic method, temperature values ​​are used for compressor fault diagnosis. Therefore, the amount of calculation required for diagnosis is relatively small, thereby reducing the hardware requirements for compressor fault diagnosis.

[0013] In addition, the compressor diagnostic method proposed in this application has the following additional technical features.

[0014] In the above technical solution, the diagnostic result of the compressor is determined based on the comparison between the first temperature difference and the preset temperature difference. Specifically, if the first temperature difference is greater than the preset temperature difference, the compressor is faulty.

[0015] In the above technical solution, the process of diagnosing whether the compressor is faulty is relatively simple. Therefore, the amount of calculation required for the determination process is relatively small, which reduces the hardware requirements for fault diagnosis.

[0016] In any of the above technical solutions, the diagnostic result of the compressor is determined based on the comparison result between the first temperature difference and the preset temperature difference, specifically including: if the first temperature difference is continuously greater than the preset temperature difference within a first time period, the compressor has a fault.

[0017] In this technical solution, it is considered that there may be errors in the process of collecting or acquiring the first temperature value and the second temperature value, which may cause the first temperature value to be too large and / or the second temperature value to be too small. The existence of the above errors may cause misjudgment of the compressor diagnosis, resulting in low reliability of the diagnosis results.

[0018] The technical solution of this application stipulates that the compressor is only determined to be faulty if the first temperature difference is always greater than the preset temperature difference within a first time period. In this process, the determination of compressor fault is based on the judgment results over a period of time, thus improving the reliability of compressor diagnosis.

[0019] In any of the above technical solutions, the diagnostic result of the compressor is determined based on the comparison result between the first temperature difference and the preset temperature difference, specifically including: when the compressor runs at different speeds, if the first temperature difference is continuously greater than the preset temperature difference, the compressor has a fault.

[0020] In this technical solution, the present application provides another alternative solution for improving the reliability of compressor diagnostics.

[0021] In this technical solution, the compressor is controlled to operate at different speeds, such as sequentially switching between N pre-selected speeds. The temperature difference between the power devices and non-power devices at each speed is compared with a preset temperature difference. If the first temperature difference consistently exceeds the preset temperature difference, the compressor is deemed faulty. This process, performing fault diagnosis under different operating conditions, improves the reliability of the diagnosis.

[0022] In any of the above technical solutions, the method further includes: obtaining the operating parameters of the compressor, wherein the temperature difference between the power device and the non-power device is correlated with the operating parameters; and determining the preset temperature difference corresponding to the operating parameters based on the correlation.

[0023] In the above technical solution, since the preset temperature difference is determined based on the operating parameters and is not static, the accuracy of fault diagnosis is improved.

[0024] In any of the above technical solutions, the operating parameters include one or more of the following: the amplitude of the compressor phase current, the compressor speed, the compressor bus voltage, the compressor suction pressure, the compressor discharge pressure, the compressor suction temperature, and the compressor discharge temperature.

[0025] The technical solution specifies the parameters that may be included in the operating parameters.

[0026] Specifically, the amplitude of the compressor's phase current is positively correlated with the preset temperature difference; the compressor's speed is negatively correlated with the preset temperature difference; and the bus voltage is negatively correlated with the preset temperature difference. Compared to the negative correlation between the compressor's speed and the preset temperature difference, the negative correlation between the bus voltage and the preset temperature difference is weak.

[0027] In one of the technical solutions, the correspondence between the intake pressure, exhaust pressure, intake temperature, exhaust temperature and the preset temperature difference can be obtained through experiments, and will not be elaborated here.

[0028] In any of the above technical solutions, an alarm message is also output in the event of a compressor malfunction.

[0029] In this technical solution, reminder messages are output so that users are aware of the issue and can perform timely maintenance on the compressor, thereby reducing the impact of compressor failure.

[0030] According to a second aspect of the present invention, a diagnostic device for a compressor is provided. The compressor includes an electronic control board on which power devices and non-power devices are arranged. The diagnostic device includes: an acquisition unit for periodically acquiring a first temperature value of the power devices and a second temperature value of the non-power devices; a determination unit for determining a first temperature difference based on the first temperature value and the second temperature value; and determining a temperature rise rate based on the first temperature difference and a calculation period; and a diagnostic unit for determining a diagnostic result of the compressor based on a comparison between the first temperature difference and a preset temperature difference when the temperature rise rate is less than a preset value; wherein the preset temperature difference is the temperature difference between the power devices and the non-power devices when the compressor is fault-free.

[0031] This technical solution proposes a compressor diagnostic device that can detect compressor faults. The diagnostic method uses temperature values ​​for compressor fault diagnosis, which reduces the computational load required and lowers the hardware requirements for compressor fault diagnosis.

[0032] In addition, the diagnostic device for the compressor proposed in this application has the following additional technical features.

[0033] In the above technical solution, the diagnostic unit is specifically used to: indicate that the compressor has a fault when the first temperature difference is greater than the preset temperature difference.

[0034] In the above technical solution, the process of diagnosing whether the compressor is faulty is relatively simple. Therefore, the amount of calculation required for the determination process is relatively small, which reduces the hardware requirements for fault diagnosis.

[0035] In any of the above technical solutions, the diagnostic unit is specifically used to: indicate that the compressor has a fault when the first temperature difference is continuously greater than the preset temperature difference within a first time period.

[0036] In this technical solution, it is considered that there may be errors in the process of collecting or acquiring the first temperature value and the second temperature value, which may cause the first temperature value to be too large and / or the second temperature value to be too small. The existence of the above errors may cause misjudgment of the compressor diagnosis, resulting in low reliability of the diagnosis results.

[0037] The technical solution of this application stipulates that the compressor is only determined to be faulty if the first temperature difference is always greater than the preset temperature difference within a first time period. In this process, the determination of compressor fault is based on the judgment results over a period of time, thus improving the reliability of compressor diagnosis.

[0038] In any of the above technical solutions, the diagnostic unit is specifically used to: when the compressor is running at different speeds, if the first temperature difference is continuously greater than the preset temperature difference, the compressor has a fault.

[0039] In this technical solution, the present application provides another alternative solution for improving the reliability of compressor diagnostics.

[0040] In this technical solution, the compressor is controlled to operate at different speeds, such as sequentially switching between N pre-selected speeds. The temperature difference between the power devices and non-power devices at each speed is compared with a preset temperature difference. If the first temperature difference consistently exceeds the preset temperature difference, the compressor is deemed faulty. This process, performing fault diagnosis under different operating conditions, improves the reliability of the diagnosis.

[0041] In any of the above technical solutions, the diagnostic unit is further configured to: acquire the operating parameters of the compressor, and determine the preset temperature difference value corresponding to the operating parameters based on the correlation between the temperature difference value of the power device and the non-power device.

[0042] In the above technical solution, since the preset temperature difference is determined based on the operating parameters and is not static, the accuracy of fault diagnosis is improved.

[0043] In any of the above technical solutions, the operating parameters include one or more of the following: the amplitude of the compressor phase current, the compressor speed, the compressor bus voltage, the compressor suction pressure, the compressor discharge pressure, the compressor suction temperature, and the compressor discharge temperature.

[0044] The technical solution specifies the parameters that may be included in the operating parameters.

[0045] Specifically, the amplitude of the compressor's phase current is positively correlated with the preset temperature difference; the compressor's speed is negatively correlated with the preset temperature difference; and the bus voltage is negatively correlated with the preset temperature difference. Compared to the negative correlation between the compressor's speed and the preset temperature difference, the negative correlation between the bus voltage and the preset temperature difference is weak.

[0046] In one of the technical solutions, the correspondence between the intake pressure, exhaust pressure, intake temperature, exhaust temperature and the preset temperature difference can be obtained through experiments, and will not be elaborated here.

[0047] In any of the above technical solutions, the diagnostic unit is also used to: output alarm information when the compressor malfunctions.

[0048] In this technical solution, reminder messages are output so that users are aware of the issue and can perform timely maintenance on the compressor, thereby reducing the impact of compressor failure.

[0049] The alarm information can be output in the form of text, audio, or light, etc. The specific output format will not be elaborated here.

[0050] According to a third aspect of the present invention, the present invention provides a diagnostic device for a compressor, comprising: a controller and a memory, wherein the memory stores a program or instructions, and the controller, when executing the program or instructions in the memory, implements the steps of any of the diagnostic methods described above.

[0051] According to a fourth aspect of the present invention, a readable storage medium is provided on which a program or instructions are stored, which, when executed by a processor, implement the steps of any of the diagnostic methods described above.

[0052] According to a fifth aspect of the present invention, a compressor is provided, comprising: an electronic control board having power devices and non-power devices arranged on the electronic control board; a diagnostic device for the compressor as described above; and / or a readable storage medium as described above.

[0053] The above technical solution also includes: a first temperature detection element, disposed on the packaging shell of the power device, at the bonding point between the power device and the control board, or on the heat sink of the power device, for obtaining a first temperature value; and a second temperature detection element, disposed on the control board at a position away from the first temperature detection element, in the cavity of the compressor inverter, or on the compressor housing near the compressor intake port, for obtaining a second temperature value.

[0054] In this technical solution, the power device is typically encapsulated in a housing to ensure stable operation. By placing a first temperature sensing element within the housing, allowing it to directly contact the power device and obtain its temperature value, the reliability and accuracy of the detected temperature value are improved due to the direct contact between the sensing element and the power device, thereby enhancing the reliability of compressor fault detection.

[0055] In the above technical solution, the power device is soldered onto the control board. Therefore, the heat generated by the power device is also transferred to the control board. By placing a first temperature sensing element at the bonding point, the temperature at the bonding point can be used as the temperature of the power device. This technical solution overcomes the problem that the first temperature sensing element cannot be directly bonded to the power device due to limited installation space.

[0056] Typically, power devices are equipped with heat sinks, which are attached to the power device. By placing a first temperature sensing element on the heat sink, the temperature of the power device can be indirectly measured.

[0057] In the above technical solution, by placing the second temperature device at a position relatively far from the first temperature detection device in the electronic control board, the influence of the power device on the temperature detected by the second temperature detection device is reduced, thereby improving the accuracy of diagnosis.

[0058] In the above technical solution, the compressor is an electric compressor.

[0059] According to a sixth aspect of the present invention, the present invention provides a vehicle comprising: a compressor as described in any of the above.

[0060] In the above technical solution, the vehicle also includes: an output device connected to the compressor, which outputs alarm information in the event of a compressor malfunction.

[0061] In this technical solution, the output device can be a sound output device, such as a speaker; it can also be a text display device, such as a display screen; or it can be a light output device, such as an indicator light.

[0062] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0063] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0064] Figure 1 A flowchart illustrating the compressor diagnostic method in an embodiment of the present invention is shown;

[0065] Figure 2 One of the schematic block diagrams of a compressor diagnostic device is shown in an embodiment of the present invention;

[0066] Figure 3 A second schematic block diagram of the diagnostic device for the compressor in an embodiment of the present invention is shown;

[0067] Figure 4 A schematic diagram showing the positions of the first temperature sensing element, the second temperature sensing element, the power device, and the non-power device in an embodiment of the present invention is shown.

[0068] Figure 5 The diagram illustrates the correlation between the preset temperature difference value and the amplitude of the compressor's phase current and the compressor's rotational speed in an embodiment of the present invention.

[0069] in, Figure 4 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0070] 402 First temperature sensing element, 404 Second temperature sensing element, 406 Power device, 408 Non-power device. Detailed Implementation

[0071] To better understand the above aspects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0072] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0073] In one embodiment of this application, such as Figure 1 As shown, a diagnostic method for a compressor is provided. The compressor includes an electronic control board, on which power devices and non-power devices are arranged. The diagnostic method includes:

[0074] Step 102: Periodically acquire the first temperature value of the power device and the second temperature value of the non-power device;

[0075] Step 104: Determine the first temperature difference based on the first temperature value and the second temperature value;

[0076] Step 106: Determine the temperature rise rate based on the first temperature difference and the calculation period;

[0077] Step 108: If the temperature rise rate is less than the preset value, determine the compressor's diagnostic result based on the comparison between the first temperature difference and the preset temperature difference.

[0078] The preset temperature difference is the temperature difference between the power devices and the non-power devices when the compressor is fault-free.

[0079] In this embodiment, a compressor diagnostic method is proposed. By running this diagnostic method, compressor fault detection can be achieved. In the above diagnostic method, the temperature value is used to diagnose compressor faults. Therefore, the amount of calculation required for diagnosis is relatively small, thereby reducing the hardware requirements for compressor fault diagnosis.

[0080] The embodiments of this application are based on the following principle: Specifically, when the compressor is powered on, the power devices and non-power devices on the control board operate. When the power devices are operating, their temperature increases with the increase of the load. However, for the non-power devices, their operating temperature hardly increases with the increase of the load, but is related to the environment. In the case of a compressor malfunction, the malfunction will be reflected in the power devices, causing the power devices to generate more heat. Based on this, the compressor malfunction can be diagnosed by determining the first temperature difference between the first temperature value of the power devices and the second temperature value of the non-power devices.

[0081] Considering that the temperature of power devices rises rapidly in the early stages of operation, fault detection at this time is prone to misjudgment. By limiting the execution of the above steps to the condition that the ratio of the first temperature difference to the calculation cycle is less than a preset value, the diagnosis can be performed after the compressor operation has stabilized, i.e., the first temperature difference has stabilized, in order to improve the accuracy of fault detection.

[0082] In one embodiment, the calculation period can be understood as the control period, wherein the control period can be understood as the period of the pulse width modulation signal used to control the operation of the compressor, and the temperature rise rate is the ratio of the first temperature difference to the calculation period.

[0083] Specifically, the determined first temperature difference is compared with the temperature difference when the compressor is not faulty (i.e., the preset temperature difference), and the compressor is then judged as faulty based on the comparison result.

[0084] In one embodiment, the power device may be the switching transistor of the inverter in the compressor, and the non-power device may be a capacitor and / or resistor on the control board.

[0085] In one embodiment, by periodically acquiring a first temperature value and a second temperature value, it is possible to detect whether the compressor is faulty in real time based on the updated first and second temperature values, and then maintain the faulty compressor in a timely manner if a compressor malfunctions.

[0086] In the above embodiments, the diagnostic result of the compressor is determined based on the comparison result between the first temperature difference and the preset temperature difference, specifically including: if the first temperature difference is greater than the preset temperature difference, the compressor has a fault.

[0087] In this embodiment, as can be seen from the above, when the compressor malfunctions, the heat generated by the power device will increase. When the heat generated by the power device increases, the first temperature difference determined by the first temperature value and the second temperature value will increase. When the first temperature difference exceeds the preset temperature difference, the compressor is considered to be malfunctioning.

[0088] In the above embodiments, the diagnostic process for whether the compressor is faulty is relatively simple. Therefore, the amount of computation required for the determination process is relatively small, thereby reducing the hardware requirements for fault diagnosis.

[0089] In one embodiment, it can be understood that the preset temperature difference is the temperature difference between the power device and the non-power device when the compressor is at its maximum load and the compressor is not malfunctioning.

[0090] In any of the above embodiments, the diagnostic result of the compressor is determined based on the comparison result between the first temperature difference and the preset temperature difference, specifically including: if the first temperature difference is continuously greater than the preset temperature difference within a first time period, the compressor has a fault.

[0091] In this embodiment, considering that there may be errors in the process of collecting or acquiring the first temperature value and the second temperature value, resulting in the first temperature value being too large and / or the second temperature value being too small, the existence of the above errors will cause the compressor diagnosis to be misjudged, resulting in low reliability of the diagnosis results.

[0092] The embodiments of this application define that a compressor malfunction is determined only if the first temperature difference is consistently greater than a preset temperature difference within a first time period. In this process, the determination of compressor malfunction is based on the judgment results over a period of time, thus improving the reliability of compressor diagnosis.

[0093] In one embodiment, the first duration can be set according to the required fault diagnosis accuracy of the compressor. Specifically, as the fault diagnosis accuracy of the compressor increases, the value of the first duration increases, and conversely, as the fault diagnosis accuracy of the compressor decreases, the value of the first duration decreases.

[0094] In one embodiment, since the first temperature value and the second temperature value are acquired periodically, that is, once every interval, the first temperature difference value continuously being greater than the preset temperature difference value in the first time period can be equivalent to the number of times the continuous judgment that the first temperature difference value is greater than the preset temperature difference value being true is greater than the preset number of times, where the preset number of times is the ratio of the first time period to the interval period, so as to meet the usage requirements in different scenarios.

[0095] In any of the above embodiments, the diagnostic result of the compressor is determined based on the comparison result between the first temperature difference and the preset temperature difference, specifically including: when the compressor is running at different speeds, if the first temperature difference is continuously greater than the preset temperature difference, the compressor has a fault.

[0096] In this embodiment, the present application provides another alternative solution for improving the reliability of compressor diagnostics.

[0097] In this embodiment, the compressor is controlled to operate at different speeds, such as sequentially switching between N pre-selected speeds. The temperature difference between the power devices and non-power devices at each speed is compared with a preset temperature difference. If the first temperature difference consistently exceeds the preset temperature difference, the compressor is deemed faulty. This process, performing fault diagnosis under different operating conditions, improves the reliability of the diagnosis.

[0098] In one embodiment, the speeds included in the N speeds can be selected according to the actual usage scenario of the compressor, such as unloaded speed and loaded speed.

[0099] In one embodiment, the N rotational speeds can be selected from at least two of the following: rated speed, half the rated speed, and maximum speed.

[0100] In any of the above embodiments, the method further includes: acquiring the operating parameters of the compressor, wherein the temperature difference between the power device and the non-power device is correlated with the operating parameters; and determining the preset temperature difference corresponding to the operating parameters based on the correlation.

[0101] In this embodiment, a scheme for determining the preset temperature difference is defined. Specifically, the preset temperature difference is related to the operating parameters of the compressor. The preset temperature difference can be dynamically changed according to the operating parameters so that when diagnosing compressor faults, the preset temperature difference can reflect the compressor under the current operating conditions to the greatest extent and is suitable for determining whether there is a fault.

[0102] In the above embodiments, since the preset temperature difference is determined based on the operating parameters and is not static, the accuracy of fault diagnosis is improved.

[0103] In the above embodiments, the relationship can be represented by a mapping table, such as constructing a table between operating parameters and temperature difference, so that after obtaining the operating parameters, the table can be directly used to determine the preset temperature difference.

[0104] In the above embodiments, the correlation can be obtained by calibration during compressor operation.

[0105] In any of the above embodiments, the operating parameters include one or more of the following: the amplitude of the compressor phase current, the compressor speed, the compressor bus voltage, the compressor suction pressure, the compressor discharge pressure, the compressor suction temperature, and the compressor discharge temperature.

[0106] In this embodiment, the parameters that may be included in the operating parameters are specifically given.

[0107] Specifically, the amplitude of the compressor's phase current is positively correlated with the preset temperature difference; the compressor's speed is negatively correlated with the preset temperature difference; and the bus voltage is negatively correlated with the preset temperature difference. Compared to the negative correlation between the compressor's speed and the preset temperature difference, the negative correlation between the bus voltage and the preset temperature difference is weak.

[0108] The relationship between the preset temperature difference value and the amplitude of the compressor's phase current and the compressor's speed is as follows: Figure 5 As shown, Speed ​​represents the compressor's rotational speed, I represents the amplitude of the compressor's phase current, and Temp rising is the temperature rise value, which is the preset temperature difference value mentioned above.

[0109] In one embodiment, the correspondence between the inhalation pressure, exhaust pressure, inhalation temperature, exhaust temperature and the preset temperature difference can be obtained through experiments, and will not be elaborated here.

[0110] In one embodiment, the amplitude of the compressor's phase current can be determined by using a phase current sensor to measure the phase currents ia, ib, and ic, and by performing corresponding signal processing to obtain the amplitude of the phase current. The phase current sensor includes, for example, a sampling resistor, a Hall sensor, etc.

[0111] In one embodiment, the compressor speed can be determined by the compressor speed signal; the bus voltage can be measured by a DC bus voltage sensor; and when the compressor is an air conditioning compressor in a vehicle, the compressor suction pressure, compressor discharge pressure, compressor suction temperature, and compressor discharge temperature can be obtained by the air conditioning controller.

[0112] In any of the above embodiments, the method further includes: outputting alarm information in the event of a compressor malfunction.

[0113] In this embodiment, by outputting reminder information so that users are aware and can perform timely maintenance on the compressor, the impact of compressor failure can be reduced.

[0114] The alarm information can be output in the form of text, audio, or light, etc. The specific output format will not be elaborated here.

[0115] In one embodiment, such as Figure 2As shown, the present invention provides a compressor diagnostic device 200. The compressor includes an electronic control board, on which power devices and non-power devices are arranged. The diagnostic device includes: an acquisition unit 202, used to periodically acquire a first temperature value of the power devices and a second temperature value of the non-power devices; a determination unit 204, used to determine a first temperature difference based on the first temperature value and the second temperature value; and to determine the temperature rise rate based on the first temperature difference and the calculation period; and a diagnostic unit 206, used to determine the diagnostic result of the compressor based on the comparison result of the first temperature difference and the preset temperature difference when the temperature rise rate is less than a preset value; wherein, the preset temperature difference is the temperature difference between the power devices and the non-power devices when the compressor is fault-free.

[0116] In this embodiment, a compressor diagnostic device 200 is proposed, which can realize compressor fault detection. In the above diagnostic method, the temperature value is used to diagnose the compressor fault. Therefore, the amount of calculation required for diagnosis is relatively small, thereby reducing the hardware requirements for compressor fault diagnosis.

[0117] The embodiments of this application are based on the following principle: Specifically, when the compressor is powered on, the power devices and non-power devices on the control board operate. When the power devices are operating, their temperature increases with the increase of the load. However, for the non-power devices, their operating temperature hardly increases with the increase of the load, but is related to the environment. In the case of a compressor malfunction, the malfunction will be reflected in the power devices, causing the power devices to generate more heat. Based on this, the compressor malfunction can be diagnosed by determining the first temperature difference between the first temperature value of the power devices and the second temperature value of the non-power devices.

[0118] Specifically, the determined first temperature difference is compared with the temperature difference when the compressor is not faulty (i.e., the preset temperature difference), and the compressor is then judged as faulty based on the comparison result.

[0119] In one embodiment, the power device may be the switching transistor of the inverter in the compressor.

[0120] In one embodiment, by periodically acquiring a first temperature value and a second temperature value, it is possible to detect whether the compressor is faulty in real time based on the updated first and second temperature values, and then maintain the faulty compressor in a timely manner if a compressor malfunctions.

[0121] In the above embodiment, the diagnostic unit 206 is specifically used to: when the first temperature difference is greater than the preset temperature difference, the compressor has a fault.

[0122] In this embodiment, as can be seen from the above, when the compressor malfunctions, the heat generated by the power device will increase. When the heat generated by the power device increases, the first temperature difference determined by the first temperature value and the second temperature value will increase. When the first temperature difference exceeds the preset temperature difference, the compressor is considered to be malfunctioning.

[0123] In the above embodiments, the diagnostic process for whether the compressor is faulty is relatively simple. Therefore, the amount of computation required for the determination process is relatively small, thereby reducing the hardware requirements for fault diagnosis.

[0124] In one embodiment, it can be understood that the preset temperature difference is the temperature difference between the power device and the non-power device when the compressor is at its maximum load and the compressor is not malfunctioning.

[0125] In any of the above embodiments, the diagnostic unit 206 is specifically used to: indicate that the compressor has a fault when the first temperature difference is continuously greater than the preset temperature difference within a first time period.

[0126] In this embodiment, considering that there may be errors in the process of collecting or acquiring the first temperature value and the second temperature value, resulting in the first temperature value being too large and / or the second temperature value being too small, the existence of the above errors will cause the compressor diagnosis to be misjudged, resulting in low reliability of the diagnosis results.

[0127] The embodiments of this application define that a compressor malfunction is determined only if the first temperature difference is consistently greater than a preset temperature difference within a first time period. In this process, the determination of compressor malfunction is based on the judgment results over a period of time, thus improving the reliability of compressor diagnosis.

[0128] In one embodiment, the first duration can be set according to the required fault diagnosis accuracy of the compressor. Specifically, as the fault diagnosis accuracy of the compressor increases, the value of the first duration increases, and conversely, as the fault diagnosis accuracy of the compressor decreases, the value of the first duration decreases.

[0129] In one embodiment, since the first temperature value and the second temperature value are acquired periodically, that is, once every interval, the first temperature difference value continuously being greater than the preset temperature difference value in the first time period can be equivalent to the number of times the continuous judgment that the first temperature difference value is greater than the preset temperature difference value being true is greater than the preset number of times, where the preset number of times is the ratio of the first time period to the interval period, so as to meet the usage requirements in different scenarios.

[0130] In any of the above embodiments, the diagnostic unit 206 is specifically used to: when the compressor is running at different speeds, if the first temperature difference is continuously greater than the preset temperature difference, the compressor has a fault.

[0131] In this embodiment, the present application provides another alternative solution for improving the reliability of compressor diagnostics.

[0132] In this embodiment, the compressor is controlled to operate at different speeds, such as sequentially switching between N pre-selected speeds. The temperature difference between the power devices and non-power devices at each speed is compared with a preset temperature difference. If the first temperature difference consistently exceeds the preset temperature difference, the compressor is deemed faulty. This process, performing fault diagnosis under different operating conditions, improves the reliability of the diagnosis.

[0133] In one embodiment, the speeds included in the N speeds can be selected according to the actual usage scenario of the compressor, such as unloaded speed and loaded speed.

[0134] In one embodiment, the N rotational speeds can be selected from at least two of the following: rated speed, half the rated speed, and maximum speed.

[0135] In any of the above embodiments, the diagnostic unit 206 is further configured to: acquire the operating parameters of the compressor, and the temperature difference between the power device and the non-power device has a correlation with the operating parameters; and determine the preset temperature difference corresponding to the operating parameters based on the correlation.

[0136] In this embodiment, a scheme for determining the preset temperature difference is defined. Specifically, the preset temperature difference is related to the operating parameters of the compressor. The preset temperature difference can be dynamically changed according to the operating parameters so that when diagnosing compressor faults, the preset temperature difference can reflect the compressor under the current operating conditions to the greatest extent and is suitable for determining whether there is a fault.

[0137] In the above embodiments, since the preset temperature difference is determined based on the operating parameters and is not static, the accuracy of fault diagnosis is improved.

[0138] In the above embodiments, the relationship can be represented by a mapping table, such as constructing a table between operating parameters and temperature difference, so that after obtaining the operating parameters, the table can be directly used to determine the preset temperature difference.

[0139] In the above embodiments, the correlation can be obtained by calibration during compressor operation.

[0140] In any of the above embodiments, the operating parameters include one or more of the following: the amplitude of the compressor phase current, the compressor speed, the compressor bus voltage, the compressor suction pressure, the compressor discharge pressure, the compressor suction temperature, and the compressor discharge temperature.

[0141] In this embodiment, the parameters that may be included in the operating parameters are specifically given.

[0142] Specifically, the amplitude of the compressor's phase current is positively correlated with the preset temperature difference; the compressor's speed is negatively correlated with the preset temperature difference; and the bus voltage is negatively correlated with the preset temperature difference. Compared to the negative correlation between the compressor's speed and the preset temperature difference, the negative correlation between the bus voltage and the preset temperature difference is weak.

[0143] In one embodiment, the correspondence between the inhalation pressure, exhaust pressure, inhalation temperature, exhaust temperature and the preset temperature difference can be obtained through experiments, and will not be elaborated here.

[0144] In any of the above embodiments, the diagnostic unit 206 is further configured to: output alarm information in the event of a compressor malfunction.

[0145] In this embodiment, by outputting reminder information so that users are aware and can perform timely maintenance on the compressor, the impact of compressor failure can be reduced.

[0146] The alarm information can be output in the form of text, audio, or light, etc. The specific output format will not be elaborated here.

[0147] In one embodiment, such as Figure 3 As shown, the present invention provides a diagnostic device 300 for a compressor, comprising: a controller 302 and a memory 304, wherein the memory 304 stores a program or instructions, and the controller 302 implements the steps of any of the diagnostic methods described above when executing the program or instructions in the memory 304.

[0148] The memory 304 can be used to store software programs and various data. The memory may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory may include volatile memory or non-volatile memory, or both. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory in the embodiments of this application includes, but is not limited to, these and any other suitable types of memory.

[0149] In one embodiment, the present invention provides a readable storage medium on which a program or instructions are stored, which, when executed by a processor, implement the steps of any of the diagnostic methods described above.

[0150] When the program or instructions stored in the readable storage medium proposed in this application are executed, they can implement the above-mentioned diagnostic method. Therefore, when the program or instructions stored in the readable storage medium are executed, they have all the technical effects of the above-mentioned embodiments, which will not be repeated here.

[0151] In this embodiment, temperature values ​​are used for compressor fault diagnosis. Therefore, the amount of computation required for diagnosis is relatively small, thereby reducing the hardware requirements for compressor fault diagnosis.

[0152] The embodiments of this application are based on the following principle: Specifically, when the compressor is powered on, the power devices and non-power devices on the control board operate. When the power devices are operating, their temperature increases with the increase of the load. However, for the non-power devices, their operating temperature hardly increases with the increase of the load, but is related to the environment. In the case of a compressor malfunction, the malfunction will be reflected in the power devices, causing the power devices to generate more heat. Based on this, the compressor malfunction can be diagnosed by determining the first temperature difference between the first temperature value of the power devices and the second temperature value of the non-power devices.

[0153] In one embodiment, the present invention provides a compressor comprising: an electronic control board having power devices and non-power devices arranged on the electronic control board; a diagnostic device for the compressor as described above; and / or a readable storage medium as described above.

[0154] In this embodiment, temperature values ​​are used for compressor fault diagnosis. Therefore, the amount of computation required for diagnosis is relatively small, thereby reducing the hardware requirements for compressor fault diagnosis.

[0155] The embodiments of this application are based on the following principle: Specifically, when the compressor is powered on, the power devices and non-power devices on the control board operate. When the power devices are operating, their temperature increases with the increase of the load. However, for the non-power devices, their operating temperature hardly increases with the increase of the load, but is related to the environment. In the case of a compressor malfunction, the malfunction will be reflected in the power devices, causing the power devices to generate more heat. Based on this, the compressor malfunction can be diagnosed by determining the first temperature difference between the first temperature value of the power devices and the second temperature value of the non-power devices.

[0156] In the above embodiments, such as Figure 4 As shown, power device 406 and non-power device 408 are disposed inside the frequency converter and located within the outline of the frequency converter. The compressor also includes: a first temperature detection element 402, disposed on the encapsulation shell of the power device, the contact point between the power device and the control board, or on the heat sink of the power device, for obtaining a first temperature value; and a second temperature detection element 404, disposed on the control board at a position away from the first temperature detection element, in the cavity of the compressor inverter, or on the compressor housing near the compressor intake port, for obtaining a second temperature value.

[0157] In this embodiment, the power device is typically encapsulated in a housing to ensure stable operation. By placing a first temperature sensor 402 within the housing, allowing it to directly contact the power device and obtain its temperature value, the reliability and accuracy of the detected temperature value are improved, thus enhancing the reliability of compressor fault detection.

[0158] In the above embodiment, the power device is soldered onto the control board. Therefore, the heat generated by the power device is also transferred to the control board. By placing the first temperature sensor 402 at the bonding area, the temperature at the bonding area can be detected as the temperature of the power device. In this embodiment, the problem that the first temperature sensor 402 cannot be directly bonded to the power device due to limited installation space can be overcome.

[0159] Typically, power devices are equipped with heat sinks, which are attached to the power device. By placing the first temperature sensing element 402 on the heat sink, the temperature of the power device can be indirectly measured.

[0160] In the above embodiment, by placing the second temperature detection element 404 at a position relatively far from the first temperature detection element 402 in the electronic control board, the influence of the power device on the temperature detected by the second temperature detection element 404 is reduced, thereby improving the accuracy of diagnosis.

[0161] In one embodiment, multiple first temperature sensors 402 and second temperature sensors 404 can be selected according to actual usage needs.

[0162] In the above embodiments, the compressor is an electric compressor.

[0163] In one embodiment, the present invention provides a vehicle including a compressor as described above.

[0164] In this embodiment, the proposed vehicle has the aforementioned compressor, and therefore the vehicle possesses all the beneficial technical effects of the aforementioned compressor.

[0165] Specifically, it can realize compressor fault detection. In the above diagnostic method, temperature value is used to diagnose compressor faults. Therefore, the amount of calculation required for diagnosis is relatively small, thereby reducing the hardware requirements for compressor fault diagnosis.

[0166] The embodiments of this application are based on the following principle: Specifically, when the compressor is powered on, the power devices and non-power devices on the control board operate. When the power devices are operating, their temperature increases with the increase of the load. However, for the non-power devices, their operating temperature hardly increases with the increase of the load, but is related to the environment. In the case of a compressor malfunction, the malfunction will be reflected in the power devices, causing the power devices to generate more heat. Based on this, the compressor malfunction can be diagnosed by determining the first temperature difference between the first temperature value of the power devices and the second temperature value of the non-power devices.

[0167] In the above embodiments, the vehicle further includes an output device connected to the compressor, which outputs alarm information in the event of a compressor malfunction.

[0168] In this embodiment, the output device can be a sound output device, such as a speaker; it can also be a text display device, such as a display screen; or it can be a light output device, such as an indicator light.

[0169] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the textual description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0170] In the textual description of this invention, it is understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing and simplifying the embodiments of this invention, and do not indicate or imply that the structures, devices, or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limiting the invention.

[0171] In the textual description of this invention, it is understood that, unless explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0172] In the claims, description, and accompanying drawings of this invention, the term "plural" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description process, not to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limiting the invention. The terms "connect," "install," "fix," etc., should be interpreted broadly. For example, "connect" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects or an indirect connection between multiple objects through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this invention can be understood based on the specific circumstances described above.

[0173] In the claims, description, and accompanying drawings of this invention, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In the claims, description, and accompanying drawings of this invention, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0174] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for diagnosing a compressor, characterized in that, The compressor includes an electronic control board, on which power devices and non-power devices are arranged. The diagnostic method includes: The first temperature value of the power device and the second temperature value of the non-power device are periodically acquired; The first temperature difference is determined based on the first temperature value and the second temperature value; The temperature rise rate is determined based on the first temperature difference and the calculation period; If the temperature rise rate is less than a preset value, the diagnostic result of the compressor is determined based on the comparison result between the first temperature difference and the preset temperature difference. Wherein, the preset temperature difference is the temperature difference between the power device and the non-power device when the compressor is fault-free; The step of determining the diagnostic result of the compressor based on the comparison result between the first temperature difference and the preset temperature difference specifically includes: If the first temperature difference is greater than the preset temperature difference, the compressor is faulty; The diagnostic method for the compressor also includes: The operating parameters of the compressor are obtained, and the temperature difference between the power device and the non-power device is correlated with the operating parameters; Based on the correlation, the preset temperature difference value corresponding to the operating parameter is determined; The operating parameters include one or more of the following: The amplitude of the phase current of the compressor, the speed of the compressor, the bus voltage of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, the suction temperature of the compressor, and the discharge temperature of the compressor.

2. The compressor diagnostic method according to claim 1, characterized in that, The step of determining the diagnostic result of the compressor based on the comparison result between the first temperature difference and the preset temperature difference specifically includes: If the first temperature difference value is continuously greater than the preset temperature difference value within a first time period, the compressor is faulty.

3. The compressor diagnostic method according to claim 1, characterized in that, The step of determining the diagnostic result of the compressor based on the comparison result of the first temperature difference and the preset temperature difference specifically includes: when the compressor is running at different speeds, if the first temperature difference is continuously greater than the preset temperature difference, the compressor has a fault.

4. The diagnostic method for a compressor according to any one of claims 1 to 3, characterized in that, Also includes: If the compressor malfunctions, an alarm message will be output.

5. A diagnostic device for a compressor, characterized in that, The compressor includes an electronic control board, on which power devices and non-power devices are arranged. The diagnostic device includes: The acquisition unit is used to periodically acquire the first temperature value of the power device and the second temperature value of the non-power device; The determining unit is configured to determine a first temperature difference based on the first temperature value and the second temperature value; and to determine the temperature rise rate based on the first temperature difference and the calculation period. A diagnostic unit is used to determine the diagnostic result of the compressor based on a comparison between the first temperature difference and the preset temperature difference when the temperature rise rate is less than a preset value. Wherein, the preset temperature difference is the temperature difference between the power device and the non-power device when the compressor is fault-free; The diagnostic unit is specifically used to determine that the compressor has a fault when the first temperature difference is greater than the preset temperature difference. The diagnostic unit is further configured to acquire the operating parameters of the compressor, wherein the temperature difference between the power device and the non-power device is correlated with the operating parameters; and to determine the preset temperature difference value corresponding to the operating parameters based on the correlation. The operating parameters include one or more of the following: The amplitude of the phase current of the compressor, the speed of the compressor, the bus voltage of the compressor, the suction pressure of the compressor, the discharge pressure of the compressor, the suction temperature of the compressor, and the discharge temperature of the compressor.

6. A diagnostic device for a compressor, characterized in that, include: A controller and a memory, wherein the memory stores a program or instructions, and the controller, when executing the program or instructions in the memory, implements the steps of the method as described in any one of claims 1 to 4.

7. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the method as described in any one of claims 1 to 4.

8. A compressor, characterized in that, include: An electronic control board is provided with power devices and non-power devices. Diagnostic device for compressor as described in claim 5 or 6; and / or The readable storage medium as described in claim 7.

9. The compressor according to claim 8, characterized in that, Also includes: A first temperature sensing element is disposed on the packaging shell of the power device, at the contact point between the power device and the electronic control board, or on the heat sink of the power device, for obtaining a first temperature value. The second temperature sensor is located on the electronic control board away from the first temperature sensor, in the cavity of the compressor inverter, or on the compressor housing near the compressor intake port, and is used to acquire a second temperature value.

10. A vehicle, characterized in that, include: The compressor as described in claim 8 or 9.

11. The vehicle according to claim 10, characterized in that, The vehicle also includes: An output device, connected to the compressor, outputs alarm information in the event of a compressor malfunction.

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