CN117780610A

CN117780610A - Compressor, diagnostic method and device thereof, readable storage medium and vehicle

Info

Publication number: CN117780610A
Application number: CN202211148024.2A
Authority: CN
Inventors: 叶斌英; 杨开成; 宋万杰
Original assignee: Anqing Weiling Auto Parts Co ltd; Guangdong Welling Auto Parts Co Ltd; Anhui Welling Auto Parts Co Ltd
Current assignee: Anqing Weiling Auto Parts Co ltd; Guangdong Welling Auto Parts Co Ltd; Anhui Welling Auto Parts Co Ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2024-03-29

Abstract

The invention provides a compressor, a diagnosis method and a diagnosis device thereof, a readable storage medium and a vehicle, wherein the diagnosis method comprises the following steps: 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 the calculation period; under the condition that the temperature rise rate is smaller than a preset value, determining a diagnosis result of the compressor according to a comparison result of the first temperature difference value and the preset temperature difference value; the preset temperature difference value is the temperature difference value of the power device and the non-power device when the compressor has no fault.

Description

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

Technical Field

The present invention relates to the field of control technology, and in particular, to a compressor, a diagnostic method and apparatus thereof, a readable storage medium, and a vehicle.

Background

The compressor is a product of combination of a mechanical part, a motor and an electric control. During operation, faults such as pump body abrasion, tooth breakage, oil shortage, bearing abrasion, motor insulation failure, electric control device damage, heat conduction performance deterioration and the like can occur.

In the related technical scheme, a sensor is additionally arranged in the compressor so as to realize fault detection by using the acquisition result of the sensor, for example, the acquisition result is subjected to Fourier transform, and the change of the corresponding frequency characteristic is analyzed so as to obtain the damage of the corresponding part of the compressor, however, the diagnosis scheme of the fault requires larger operation amount and has higher requirement on hardware.

Disclosure of Invention

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

To this end, a first aspect of the present invention is to provide a diagnostic method of a compressor.

A second aspect of the present invention is to provide a diagnostic device of a compressor.

A third aspect of the present invention is to provide a diagnostic device of another compressor.

A fourth aspect of the present invention is to provide a readable storage medium.

A fifth aspect of the present invention is to provide a compressor.

A sixth aspect of the invention is to provide a vehicle.

In view of this, according to a first aspect of the present invention, there is provided a diagnostic method of a compressor including an electric control board on which power devices and non-power devices are arranged, the diagnostic method including: 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 the calculation period; under the condition that the temperature rise rate is smaller than a preset value, determining a diagnosis result of the compressor according to a comparison result of the first temperature difference value and the preset temperature difference value; the preset temperature difference value is the temperature difference value of the power device and the non-power device when the compressor has no fault.

In the technical scheme, a diagnosis method of the compressor is provided, and fault detection of the compressor can be realized by operating the diagnosis method, and in the diagnosis method, the fault diagnosis of the compressor is carried out by utilizing a temperature value, so that the calculation amount required by the diagnosis is smaller, and the requirement of the fault diagnosis of the compressor on hardware is further reduced.

In addition, the diagnostic method of the compressor provided by the application has the following additional technical characteristics.

In the above technical solution, determining the diagnosis result of the compressor according to the comparison result of the first temperature difference value and the preset temperature difference value specifically includes: and under the condition that the first temperature difference value is larger than the preset temperature difference value, the compressor has faults.

In the technical scheme, the diagnosis process of whether the compressor has faults is simpler, so that the calculation amount required by the judgment process is smaller, and the requirement of fault diagnosis on hardware is further reduced.

In any of the above technical solutions, determining a diagnosis result of the compressor according to a comparison result of the first temperature difference and a preset temperature difference specifically includes: and under the condition that the first temperature difference value is continuously larger than the preset temperature difference value in the first time period, the compressor has faults.

In the technical scheme, errors are possibly caused in the process of collecting or acquiring the first temperature value and the second temperature value, so that the first temperature value is too large and/or the second temperature value is too small, and the error can cause misjudgment of the diagnosis of the compressor, so that the reliability of the diagnosis result is lower.

According to the technical scheme, the condition that the first temperature difference value is larger than the preset temperature difference value in the first time period is limited, and the fault of the compressor is judged, in the process, the judgment of the fault of the compressor is obtained based on the judgment result in a period of time, so that the reliability of the diagnosis of the compressor is improved.

In any of the above technical solutions, determining a diagnosis result of the compressor according to a comparison result of the first temperature difference and a preset temperature difference specifically includes: when the compressors are operated at different rotational speeds, the first temperature difference is continuously larger than the preset temperature difference, and the compressors have faults.

In this solution, the solution of the present application presents another alternative for improving the reliability of the diagnosis of the compressor.

In the technical scheme, the compressor is controlled to run at different rotation speeds, for example, the operation is switched according to N rotation speeds selected in advance, the relation between the temperature difference value between the temperature value of the power device and the temperature value of the non-power device and the preset temperature difference value at each rotation speed is compared, and if the first temperature difference value continuously exceeds the preset temperature difference value, the fault of the compressor is judged. In the process, the fault diagnosis is carried out under different working conditions, so that the reliability of the diagnosis is improved.

In any of the above technical solutions, the method further includes: acquiring operation parameters of the compressor, wherein a correlation exists between the temperature difference value of the power device and the non-power device and the operation parameters; and determining a preset temperature difference value corresponding to the operation parameter according to the association relation.

In the above technical solution, since the preset temperature difference is determined based on the operation parameter, not invariably, the accuracy of the fault determination is improved.

In any of the above aspects, the operating parameters include one or more of: the amplitude of the phase current of the compressor, the rotational speed value of the compressor, the busbar voltage value 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.

In this technical solution, parameters that may be included in the operating parameters are specifically given.

Specifically, the amplitude of the phase current of the compressor is positively correlated with the preset temperature difference; the rotation speed value of the compressor is inversely related to the preset temperature difference value; the negative correlation between the bus voltage value and the preset temperature difference value is a weak correlation, and the negative correlation between the bus voltage value and the preset temperature difference value is a weak correlation with respect to the negative correlation between the rotating speed value of the compressor and the preset temperature difference value.

In one of the technical solutions, the correspondence between the suction pressure, the discharge pressure, the suction temperature, and the discharge temperature and the preset temperature difference may be obtained through experiments, and will not be described herein.

In any of the above technical solutions, the method further includes: and outputting alarm information under the condition that the compressor has faults.

In the technical scheme, the reminding information is output so that a user can know the reminding information and timely maintain the compressor, and therefore the influence caused by the fault of the compressor is reduced.

According to a second aspect of the present invention, there is provided a diagnostic apparatus of a compressor including an electric control board on which power devices and non-power devices are arranged, the diagnostic apparatus comprising: the acquisition unit is used for periodically acquiring a first temperature value of the power device and a second temperature value of the non-power device; a determining unit for 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 the calculation period; the diagnosis unit is used for determining a diagnosis result of the compressor according to a comparison result of the first temperature difference value and the preset temperature difference value under the condition that the temperature rise rate is smaller than the preset value; the preset temperature difference value is the temperature difference value of the power device and the non-power device when the compressor has no fault.

In this technical solution, a diagnostic device for a compressor is provided, which can realize fault detection of the compressor, and in the above diagnostic method, fault diagnosis of the compressor is performed by using a temperature value, so that the calculation amount required for diagnosis is relatively small, and further, the requirement of fault diagnosis of the compressor on hardware is reduced.

In addition, the diagnostic device of the compressor provided by the application has the following additional technical characteristics.

In the above technical solution, the diagnosis unit is specifically configured to: and under the condition that the first temperature difference value is larger than the preset temperature difference value, the compressor has faults.

In any of the above aspects, the diagnostic unit is specifically configured to: and under the condition that the first temperature difference value is continuously larger than the preset temperature difference value in the first time period, the compressor has faults.

In any of the above aspects, the diagnostic unit is specifically configured to: when the compressors are operated at different rotational speeds, the first temperature difference is continuously larger than the preset temperature difference, and the compressors have faults.

In any of the above aspects, the diagnostic unit is further configured to: acquiring operation parameters of the compressor, wherein a correlation exists between the temperature difference value of the power device and the non-power device and the operation parameters; and determining a preset temperature difference value corresponding to the operation parameter according to the association relation.

In any of the above aspects, the diagnostic unit is further configured to: and outputting alarm information under the condition that the compressor has faults.

The alarm information can be output in a text form, can be output in an audio form, and can also be output in a light form or the like, and the specific output form is not repeated here.

According to a third aspect of the present invention, there is provided a diagnostic device of a compressor, comprising: a controller and a memory, wherein the memory stores programs or instructions, and the controller implements the steps of the diagnostic method as described above when executing the programs or instructions in the memory.

According to a fourth aspect of the present invention there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor performs the steps of a diagnostic method as described in any of the above.

According to a fifth aspect of the present invention, there is provided a compressor comprising: the electric control board is provided with a power device and a non-power device; a diagnostic device of a compressor as described above; and/or a readable storage medium as described above.

In the above technical solution, further includes: the first temperature detection piece is arranged on the packaging shell of the power device, the joint of the power device and the electric control board or the heat dissipation piece of the power device and is used for obtaining a first temperature value; the second temperature detection piece is arranged at a position far away from the first temperature detection piece on the electric control board, a cavity of an inverter of the compressor and an air suction port close to the compressor on a shell of the compressor and is used for acquiring a second temperature value.

In this solution, the power device is usually encapsulated by an encapsulation casing, so as to ensure stable operation of the power device. Through setting up first temperature detection spare at encapsulation shell to first temperature detection spare can be between and power device contact, thereby acquire power device's temperature value, in this process, because first temperature detection spare can be between and power device contact, consequently, improved reliability and the accuracy of the first temperature value that detects, thereby improved compressor fault detection's reliability.

In the above technical scheme, the power device is welded on the electric control board, so that heat generated by the power device can be transferred to the electric control board, and the first temperature detecting piece is arranged at the joint so as to detect the temperature of the joint as the temperature of the power device. In this technical scheme, can overcome because of the installation space is limited, the unable direct laminating of first temperature detection spare sets up at power device scheduling problem.

In general, the power device is provided with a heat dissipation member, wherein the heat dissipation member is attached to the power device, and the first temperature detection member is arranged on the heat dissipation member, so that the indirect measurement of the temperature of the power device is realized.

In the technical scheme, the second temperature device is arranged at a position which is far away from the first temperature detection part in the electric control board, so that the influence of the power device on the temperature detected by the second temperature detection part is reduced, and the diagnosis accuracy is improved.

In the above technical solution, the compressor is an electric compressor.

According to a sixth aspect of the present invention, there is provided a vehicle comprising: a compressor as claimed in any one of the above.

In the above technical solution, the vehicle further includes: and the output device is connected with the compressor and outputs alarm information when the compressor fails.

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

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.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 shows a flow diagram of a method for diagnosing a compressor in an embodiment of the invention;

FIG. 2 shows one of the schematic block diagrams of a diagnostic device of a compressor in an embodiment of the invention;

FIG. 3 shows a second schematic block diagram of a diagnostic device for a compressor in an embodiment of the invention;

FIG. 4 is a schematic diagram showing the positions of the first temperature detecting member, the second temperature detecting member, the power device and the non-power device according to the embodiment of the present invention;

fig. 5 shows a correlation between a preset temperature difference and a magnitude of a phase current of a compressor and a rotational speed value of the compressor in the embodiment of the present invention.

The correspondence between the reference numerals and the component names in fig. 4 is:

402 first temperature sensing element, 404 second temperature sensing element, 406 power device, 408 non-power device.

Detailed Description

So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized below, may be had by reference to the appended drawings. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

In one embodiment of the present application, as shown in fig. 1, a method for diagnosing a compressor is provided, the compressor includes an electric control board, and a power device and a non-power device are disposed on the electric control board, and the method for diagnosing includes:

step 102, periodically acquiring a first temperature value of a power device and a second temperature value of a non-power device;

step 104, determining a first temperature difference value according to the first temperature value and the second temperature value;

step 106, determining a temperature rise rate according to the first temperature difference value and the calculation period;

And step 108, determining a diagnosis result of the compressor according to a comparison result of the first temperature difference value and the preset temperature difference value under the condition that the temperature rise rate is smaller than the preset value.

The preset temperature difference value is the temperature difference value of the power device and the non-power device when the compressor has no fault.

In this embodiment, a diagnostic method of a compressor is provided, by which fault detection of the compressor can be achieved, in which the fault diagnosis of the compressor is performed using a temperature value, so that the amount of calculation required for the diagnosis is relatively small, thereby reducing the requirement of the fault diagnosis of the compressor on hardware.

The embodiment of the application is realized based on the following principle, specifically, when the compressor is electrified and operates, the power device and the non-power device on the electric control board work, when the power device works, the temperature of the power device can rise along with the increase of the load, and when the non-power device works, the temperature of the power device hardly increases along with the increase of the load, but is related to the environment, and under the condition that the compressor has faults, the faults of the compressor can be reflected on the power device, so that the heating of the power device is increased, and based on the fact, whether the faults of the compressor are diagnosed by determining the first temperature difference value between the first temperature value on the power device and the second temperature value of the non-power device.

Considering that the temperature rising speed of the power device is higher in the initial operation period, if fault detection is performed at the moment, misjudgment is very easy to occur, and the steps are performed by limiting the ratio of the first temperature difference value to the calculation period to be smaller than a preset value so as to wait for the operation of the compressor to be stable, namely the first temperature difference value is stable and then diagnosis is performed so as to improve the accuracy of fault detection.

In one embodiment, the calculation period may be understood as a control period, wherein the control period may be understood as a period of a pulse width modulated signal for controlling the operation of the compressor, and the rate of temperature rise is a ratio of the first temperature difference to the calculation period.

Specifically, the determined first temperature difference is compared with a temperature difference (i.e., a preset temperature difference) when the compressor fails, and whether the compressor fails is determined according to the comparison result.

In one embodiment, the power device may be a switching tube of an inverter in the compressor and the non-power device may be a capacitor and/or a resistor on the electronic control board.

In one embodiment, the first temperature value and the second temperature value are obtained periodically, so that whether the compressor fails or not can be detected in real time according to the updated first temperature value and second temperature value, and further, the failed compressor is maintained in time under the condition that the compressor fails.

In the above embodiment, determining the diagnosis result of the compressor according to the comparison result of the first temperature difference value and the preset temperature difference value specifically includes: and under the condition that the first temperature difference value is larger than the preset temperature difference value, the compressor has faults.

In this embodiment, as is known from the above, in the case where the compressor fails, the heat generation amount of the power device increases, in the case where the heat generation amount of the power device increases, the first temperature difference value determined by the first temperature value and the second temperature value increases, and in the case where the first temperature difference value exceeds the preset temperature difference value, the compressor is considered to have a failure.

In the above embodiment, the diagnosis process of whether the compressor has a fault is relatively simple, so the calculation amount required by the determination process is relatively small, and the requirement of fault diagnosis on hardware is further reduced.

In one embodiment, it is understood that the preset temperature difference is a temperature difference between the temperature value of the power device and the temperature value of the non-power device when the compressor is driving the maximum load in the case that the compressor is not in fault.

In any of the above embodiments, determining the diagnosis result of the compressor according to the comparison result of the first temperature difference value and the preset temperature difference value specifically includes: and under the condition that the first temperature difference value is continuously larger than the preset temperature difference value in the first time period, the compressor has faults.

In this embodiment, it is considered that errors may exist in the process of collecting or acquiring the first temperature value and the second temperature value, so that the first temperature value is too large and/or the second temperature value is too small, and the existence of the errors may cause misjudgment of the diagnosis of the compressor, so that the reliability of the result of the diagnosis is low.

The embodiment of the application limits that the first temperature difference value is always larger than the preset temperature difference value in the first time period, and the fault of the compressor is judged.

In one embodiment, the first duration may be taken according to the fault determination accuracy of the compressor, specifically, as the fault determination accuracy of the compressor increases, the value of the first duration increases, whereas as the fault determination accuracy of the compressor decreases, the value of the first duration decreases.

In one embodiment, since the first temperature value and the second temperature value are acquired periodically, that is, acquired or acquired once every interval of time, based on the fact that the first temperature difference value is continuously greater than the preset temperature difference value in the first time, the number of times that the continuous judgment that the first temperature difference value is greater than the preset temperature difference value is established in the first time is equivalent to be greater than the preset number of times, wherein the preset number of times is the ratio of the first time to the interval time so as to meet the use requirements in different scenes.

In any of the above embodiments, determining the diagnosis result of the compressor according to the comparison result of the first temperature difference value and the preset temperature difference value specifically includes: when the compressors are operated at different rotational speeds, the first temperature difference is continuously larger than the preset temperature difference, and the compressors have faults.

In this embodiment, embodiments of the present application present an alternative approach for improving the reliability of the compressor's diagnostics.

In this embodiment, the compressor is controlled to operate at different rotational speeds, for example, the operation is switched according to N rotational speeds selected in advance, and the relationship between the difference between the temperature value of the power device and the temperature value of the non-power device and the preset temperature difference at each rotational speed is compared, and if the first temperature difference continuously exceeds the preset temperature difference, the failure of the compressor is determined. In the process, the fault diagnosis is carried out under different working conditions, so that the reliability of the diagnosis is improved.

In one embodiment, the speeds included in the N speeds may be selected according to the actual usage situation of the compressor, such as an unloaded speed and an loaded speed.

In one embodiment, the rotational speeds included in the N rotational speeds may be at least two selected from a rated rotational speed, a half rotational speed of the rated rotational speed, and a maximum rotational speed.

In any of the foregoing embodiments, further comprising: acquiring operation parameters of the compressor, wherein a correlation exists between the temperature difference value of the power device and the non-power device and the operation parameters; and determining a preset temperature difference value corresponding to the operation parameter according to the association relation.

In this embodiment, a determination scheme of a preset temperature difference is defined, specifically, the preset temperature difference is related to an operation parameter of the compressor, and the preset temperature difference may be dynamically transformed according to the operation parameter, so that when a fault diagnosis of the compressor is performed, the preset temperature difference can reflect the preset temperature difference of the compressor to the greatest extent under the current working condition, and is suitable for judging whether the compressor has a fault or not.

In the above embodiment, since the preset temperature difference is determined based on the operation parameter, not invariably, the accuracy of the failure determination is improved.

In the above embodiment, the association relationship may be represented by using a mapping table, for example, a table between the operation parameter and the temperature difference is constructed, so that after the operation parameter is obtained, the preset temperature difference may be determined directly by using the table.

In the above embodiment, the association relationship may be obtained by calibration when the compressor is running.

In any of the above embodiments, the operating parameters include one or more of the following: the amplitude of the phase current of the compressor, the rotational speed value of the compressor, the busbar voltage value 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.

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

The correlation between the preset temperature difference and the amplitude of the phase current of the compressor and the rotation Speed value of the compressor is shown in fig. 5, wherein Speed represents the rotation Speed value of the compressor, I represents the amplitude of the phase current of the compressor, and Temp rising is the temperature rise value, that is, the preset temperature difference.

In one embodiment, the correspondence between the suction pressure, the discharge pressure, the suction temperature, and the discharge temperature and the preset temperature difference may be obtained through experiments, and will not be described herein.

In one embodiment, the amplitude of the phase current of the compressor may be determined by a phase current sensor, including, for example, a sampling resistor, a hall sensor, etc., and processed accordingly to derive the amplitude of the phase current.

In one embodiment, the rotational speed value of the compressor may be determined from a rotational speed signal of the compressor; the bus voltage value can be obtained by measuring a direct current bus voltage sensor; in the case where the compressor is an air conditioning compressor on a vehicle, 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 may be obtained by an air conditioning controller.

In any of the foregoing embodiments, further comprising: and outputting alarm information under the condition that the compressor has faults.

In the embodiment, the reminding information is output so that a user can know the reminding information and timely maintain the compressor, so that the influence caused by the fault of the compressor is reduced.

In one embodiment, as shown in fig. 2, the present invention provides a diagnostic apparatus 200 of a compressor, the compressor including an electric control board on which power devices and non-power devices are disposed, the diagnostic apparatus comprising: an obtaining unit 202, configured to periodically obtain a first temperature value of the power device and a second temperature value of the non-power device; a determining unit 204 for 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 the calculation period; a diagnosis unit 206, configured to determine a diagnosis result of the compressor according to a comparison result of the first temperature difference value and the preset temperature difference value when the temperature rise rate is less than the preset value; the preset temperature difference value is the temperature difference value of the power device and the non-power device when the compressor has no fault.

In this embodiment, a diagnostic device 200 for a compressor is provided, which can implement fault detection of the compressor, and in the above diagnostic method, fault diagnosis of the compressor is performed by using a temperature value, so that the calculation amount required for diagnosis is relatively small, and the requirement of fault diagnosis of the compressor on hardware is further reduced.

In one of the embodiments, the power device may be a switching tube of an inverter in the compressor.

In the above embodiment, the diagnosis unit 206 is specifically configured to: and under the condition that the first temperature difference value is larger than the preset temperature difference value, the compressor has faults.

In any of the above embodiments, the diagnosis unit 206 is specifically configured to: and under the condition that the first temperature difference value is continuously larger than the preset temperature difference value in the first time period, the compressor has faults.

In any of the above embodiments, the diagnosis unit 206 is specifically configured to: when the compressors are operated at different rotational speeds, the first temperature difference is continuously larger than the preset temperature difference, and the compressors have faults.

In any of the above embodiments, the diagnostic unit 206 is further configured to: acquiring operation parameters of the compressor, wherein a correlation exists between the temperature difference value of the power device and the non-power device and the operation parameters; and determining a preset temperature difference value corresponding to the operation parameter according to the association relation.

In any of the above embodiments, the diagnostic unit 206 is further configured to: and outputting alarm information under the condition that the compressor has faults.

In one embodiment, as shown in fig. 3, the present invention provides a diagnostic device 300 of a compressor, comprising: a controller 302 and a memory 304, wherein the memory 304 has stored therein a program or instructions which, when executed in the memory 304, the controller 302 implements the steps of the diagnostic method as described above.

The memory 304 may be used to store software programs and various data, among other things. The memory may mainly include a first memory area storing programs or instructions and a second memory area storing data, wherein the first memory area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory may include volatile memory or nonvolatile memory, or the memory may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

In one embodiment, the present invention provides a readable storage medium having stored thereon a program or instructions which when executed by a processor perform the steps of a diagnostic method as described in any one of the above.

The program or the instruction stored in the readable storage medium according to the embodiment of the present application can implement the above-mentioned diagnostic method when executed, so that the program or the instruction stored in the readable storage medium has all the technical effects of the above-mentioned embodiment when executed, and will not be described herein.

In this embodiment, the fault diagnosis of the compressor is performed using the temperature value, and therefore, the calculation amount required for the diagnosis is relatively small, thereby reducing the hardware requirements for the fault diagnosis of the compressor.

In one embodiment, the present invention provides a compressor comprising: the electric control board is provided with a power device and a non-power device; a diagnostic device of a compressor as described above; and/or a readable storage medium as described above.

In the above embodiment, as shown in fig. 4, the power device 406 and the non-power device 408 are disposed in the inverter, within the outline of the inverter, and the compressor further includes: the first temperature detecting piece 402 is arranged on the packaging shell of the power device, the joint of the power device and the electric control board or the heat radiating piece of the power device and is used for acquiring a first temperature value; the second temperature detecting element 404 is disposed at a position far away from the first temperature detecting element on the electric control board, a cavity of the inverter of the compressor, and a suction port near the compressor on the housing of the compressor, and is used for obtaining a second temperature value.

In this embodiment, the power device is typically encapsulated by an encapsulation housing in order to ensure stable operation of the power device. By arranging the first temperature detecting member 402 on the package casing so that the first temperature detecting member 402 can be in contact with the power device, the temperature value of the power device is obtained, and in the process, the reliability and the accuracy of the detected first temperature value are improved due to the fact that the first temperature detecting member 402 can be in contact with the power device, and accordingly reliability of fault detection of the compressor is improved.

In the above embodiment, the power device is soldered to the electronic control board, so that the heat generated by the power device is also transferred to the electronic control board, and the first temperature detecting member 402 is disposed at the bonding site to detect the temperature of the bonding site as the temperature of the power device. In this embodiment, the problem that the first temperature detecting member 402 cannot be directly attached to the power device due to the limited installation space can be overcome.

Typically, the power device is provided with a heat sink, where the heat sink is attached to the power device, and the first temperature detecting element 402 is disposed on the heat sink, so as to implement indirect measurement of the temperature of the power device.

In the above embodiment, the second temperature detecting member 404 is disposed at a position relatively far from the first temperature detecting member 402 in the electronic control board, so that the influence of the power device on the temperature detected by the second temperature detecting member 404 is reduced, thereby improving the accuracy of diagnosis.

In one embodiment, the first temperature detecting member 402 and the second temperature detecting member 404 may be selected from a plurality of temperature detecting members according to actual usage requirements.

In the above embodiment, the compressor is an electric compressor.

In one embodiment, the present invention provides a vehicle comprising: a compressor as claimed in any one of the above.

In this embodiment, the proposed vehicle has the above-described compressor, so the vehicle has all the advantageous technical effects of the above-described compressor.

Specifically, the fault detection of the compressor can be realized, and in the diagnosis method, the fault diagnosis of the compressor is performed by utilizing the temperature value, so that the calculation amount required by the diagnosis is relatively small, and the requirement of the fault diagnosis of the compressor on hardware is further reduced.

In the above embodiment, the vehicle further includes: and the output device is connected with the compressor and outputs alarm information when the compressor fails.

The features of the terms "first", "second", and the like in the description and in the claims of this application may be used for descriptive or implicit inclusion of one or more such features. In the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more. In addition, in the specification and claims, "and/or" means at least one of the connected objects, and the character "/", generally means a relationship in which the associated objects are one or.

In the description of the present invention, it will be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing and simplifying the description of the embodiments of the present invention, and do not indicate or imply that the structures, devices, elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore these descriptions should not be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "mounted," "connected," and "connected" are to be construed broadly, as well as expressly specified and defined, and as such, may be fixedly connected, detachably connected, or integrally connected, for example; the mechanical structure connection and the electrical connection can be adopted; the two components can be directly connected or indirectly connected through an intermediate medium, or the two components are internally communicated. The specific meaning of the above terms in the present invention will be understood in specific cases by those skilled in the art.

In the claims, specification and drawings of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and making the description process easier, and not for the purpose of indicating or implying that the device or element in question must have the particular orientation described, be constructed and operated in the particular orientation, and therefore such description should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly, and may be, for example, a fixed connection between a plurality of objects, a removable connection between a plurality of objects, or an integral connection; the objects may be directly connected to each other or indirectly connected to each other through an intermediate medium. The specific meaning of the terms in the present invention can be understood in detail from the above data by those skilled in the art.

In the claims, specification, and drawings of the present invention, the descriptions of terms "one embodiment," "some embodiments," "particular embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the claims, specification and drawings of the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method of diagnosing a compressor, the compressor including an electric control board on which power devices and non-power devices are disposed, the method comprising:

periodically acquiring a first temperature value of the power device and a second temperature value of the non-power device;

determining a first temperature difference from the first temperature value and the second temperature value;

determining a temperature rise rate according to the first temperature difference value and the calculation period;

determining a diagnosis result of the compressor according to a comparison result of the first temperature difference value and a preset temperature difference value under the condition that the temperature rise rate is smaller than a preset value;

and the preset temperature difference value is the temperature difference value of the power device and the non-power device when the compressor has no fault.

2. The method of diagnosing a compressor according to claim 1, wherein the determining the diagnosis result of the compressor according to the comparison result of the first temperature difference value and a preset temperature difference value specifically includes:

And under the condition that the first temperature difference value is larger than the preset temperature difference value, the compressor has a fault.

3. The method of diagnosing a compressor according to claim 1, wherein the determining the diagnosis result of the compressor according to the comparison result of the first temperature difference value and a preset temperature difference value specifically includes:

and under the condition that the first temperature difference value is continuously larger than the preset temperature difference value in a first time period, the compressor has faults.

4. The method of diagnosing a compressor according to claim 1, wherein the determining the diagnosis result of the compressor according to the comparison result of the first temperature difference value and a preset temperature difference value specifically includes: when the compressors are operated at different rotational speeds, the first temperature difference is continuously greater than the preset temperature difference, and the compressors have faults.

5. The method for diagnosing a compressor according to any one of claims 1 to 4, further comprising:

acquiring the operation parameters of the compressor, wherein the temperature difference value of the power device and the non-power device has an association relation with the operation parameters;

and determining the preset temperature difference value corresponding to the operation parameter according to the association relation.

6. The method of diagnosing a compressor as recited in claim 5, wherein the operating parameters include one or more of:

the phase current of the compressor is selected from the group consisting of amplitude of phase current of the compressor, rotational speed value of the compressor, bus voltage value of the compressor, suction pressure of the compressor, discharge pressure of the compressor, suction temperature of the compressor, and discharge temperature of the compressor.

7. The method for diagnosing a compressor according to any one of claims 1 to 4, further comprising:

and outputting alarm information under the condition that the compressor has faults.

8. A diagnostic device for a compressor, the compressor including an electrical panel having power devices and non-power devices disposed thereon, the diagnostic device comprising:

an acquisition unit, configured to periodically acquire a first temperature value of the power device and a second temperature value of the non-power device;

a determining unit configured to determine 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 the calculation period;

the diagnosis unit is used for determining a diagnosis result of the compressor according to a comparison result of the first temperature difference value and a preset temperature difference value under the condition that the temperature rise rate is smaller than a preset value;

9. A diagnostic device for a compressor, comprising:

a controller and a memory, wherein the memory has stored therein a program or instructions which when executed by the controller performs the steps of the method according to any of claims 1 to 7.

10. A readable storage medium, characterized in that it stores thereon a program or instructions which, when executed by a processor, implement the steps of the method according to any of claims 1 to 7.

11. A compressor, comprising:

the power device and the non-power device are distributed on the electric control board;

the diagnostic device of a compressor as claimed in claim 8 or 9; and/or

The readable storage medium of claim 10.

12. The compressor of claim 11, further comprising:

the first temperature detection piece is arranged on the packaging shell of the power device, the joint of the power device and the electric control board or the heat dissipation piece of the power device and is used for obtaining a first temperature value;

The second temperature detection piece is arranged at a position, far away from the first temperature detection piece, on the electric control board, of the cavity of the inverter of the compressor and at an air suction port, close to the compressor, on the shell of the compressor and is used for acquiring a second temperature value.

13. A vehicle, characterized by comprising:

a compressor as claimed in claim 11 or 12.

14. The vehicle of claim 13, characterized in that the vehicle further comprises:

and the output device is connected with the compressor and outputs alarm information under the condition that the compressor has faults.