KR20190001445A - Method for diagnosing condition of inverter - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of diagnosing an inverter condition, and more particularly, to a method of diagnosing an inverter condition by analyzing log data of software that drives the inverter to diagnose the inverter condition. The method for diagnosing an inverter condition according to an embodiment of the present invention includes the steps of loading drive software installed in the inverter, Recognizing an identification number of the inverter on which the driving software is installed based on the identification information, identifying unusual log data generated in the driving software based on the design information corresponding to the recognized identification number, Determining whether the input value inputted to the driving software is normal by referring to the input data and the design information, and if the input value is determined to be normal, re-inputting the input value to the loaded driving software to generate virtual log data And generating the generated virtual log data and the non- And diagnosing the state of the inverter to be faulty according to whether the normal log data is coincident or not.

Description

[0001] The present invention relates to a method of diagnosing an inverter,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of diagnosing an inverter condition, and more particularly, to a method of diagnosing an inverter condition by analyzing abnormal log data of software that drives the inverter to diagnose the inverter condition.

An inverter is a device that controls a drive system (e.g., a motor system) driven by an inverter to operate at an optimum efficiency, and controls the output according to the state of the drive system.

The inverter monitors the state of the drive system driven by the PWM signal generation module that applies the PWM pulse to the switching device constituting the power conversion module and the inverter, and the power conversion module that converts the DC power to the AC power. Based on the monitoring result And a microcomputer for applying a voltage command value to the PWM signal generating module.

In particular, the microcomputer generates log data including the state of the drive system and the output of the inverter, and the drive software installed in the microcomputer determines whether the inverter is malfunctioning based on the log data.

However, the microcomputer can only detect whether the inverter is malfunctioning, and can not grasp the cause of the malfunction. Accordingly, in order to grasp the cause of the malfunction of the inverter in the past, the engineer copied the log data of the inverter to a separate PC and grasped the cause of the malfunction in the PC.

However, according to the conventional inverter condition diagnosis method, since the state of the inverter can not be diagnosed in the field as described above, the speed of diagnosis is very low.

In addition, the conventional inverter condition diagnosis method has a problem that the diagnosis result is different depending on the capability of each engineer. In addition, when an engineer who does not participate in the design of the inverter analyzes the log data of the inverter, it is difficult to accurately grasp the cause of the malfunction of the inverter.

In other words, it is difficult to accurately identify the cause of the inverter malfunction, and the diagnostic object and diagnosis ability depend on the ability of the engineer. Therefore, it is difficult to expand the diagnostic object, There is a problem that it can not be secured.

An object of the present invention is to provide a method of diagnosing an inverter condition which can improve the speed of diagnosis by diagnosing the state of the inverter on the spot by using a device dedicated to state diagnosis connected to the inverter.

The present invention also provides an inverter that can diagnose the status of the inverter by comparing the log data generated in the drive software executed in the inverter with the log data generated in the drive software executed in the equipment dedicated to status diagnosis, And a method for diagnosing a state.

It is another object of the present invention to provide a method of diagnosing an inverter condition which can easily extend a diagnosis target by additionally storing the source code of the new software installed in the inverter and the identification number of the inverter in the database.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description and more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to another aspect of the present invention, there is provided a method for diagnosing an inverter condition using an apparatus dedicated to state diagnosis, the method comprising: loading driving software installed in the inverter; Recognizing the identification number of the inverter on which the driving software is mounted based on the identification information of the driving software, identifying the abnormal log data generated in the driving software based on the design information corresponding to the recognized identification number Determining whether the input value inputted to the driving software is normal with reference to the identified abnormal log data and the design information, if the input value is determined to be normal, re-inputting the input value to the loaded driving software Generating virtual log data, and generating According to the match of the virtual log data and the log data is abnormal, it characterized in that it comprises a step of diagnosis of the failure state of the inverter.

According to the present invention as described above, it is possible to improve the speed of diagnosis by diagnosing the state of the inverter on the site by using a device dedicated to state diagnosis connected to the inverter.

According to the present invention, by comparing the log data generated in the drive software executed in the inverter with the log data generated in the drive software executed in the apparatus dedicated for status diagnosis, the status of the inverter can be diagnosed, It is effective.

Further, according to the present invention, the source code of the new software installed in the inverter and the identification number of the inverter are additionally stored in the database, so that the diagnosis object can be easily expanded.

1 is a flowchart illustrating a method of diagnosing an inverter condition according to an embodiment of the present invention.
2 is a flowchart showing a process of acquiring an identification number of an inverter corresponding to identification information of driving software;
3 is a flowchart showing a process of diagnosing the status of an inverter based on abnormal log data.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar elements.

The present invention relates to a method of diagnosing the state of an inverter using a device dedicated to state diagnosis, and more particularly to a method of diagnosing an inverter state by analyzing log data of software that drives the inverter and diagnosing the state of the inverter.

The apparatus dedicated for state diagnosis is an apparatus for performing the present invention to be described later, and can be connected to an inverter through an I / O port provided in the inverter. In addition, the equipment for state diagnosis can also be connected wirelessly to the inverter through the communication module included in the inverter.

The condition diagnostic dedicated equipment may include one or more processors for performing the inverter state diagnostic method described below.

1 is a flowchart illustrating a method of diagnosing an inverter condition according to an embodiment of the present invention. Referring to FIG. 1, a method for diagnosing an inverter condition according to an embodiment of the present invention includes a step S110 of loading drive software of an inverter and a step S120 of recognizing an identification number of the inverter based on the identification information of the drive software. . ≪ / RTI >

In addition, the method for diagnosing the inverter status includes the steps of identifying abnormal log data based on the design information corresponding to the recognized identification number (S130), determining whether the input value of the driving software is normal with reference to the abnormal log data and design information (S140).

Finally, in the inverter state diagnosis method, if it is determined that the input value is normal, a step of generating virtual log data by re-inputting the input value into the loaded drive software (S150) and checking whether the virtual log data and the abnormal log data match And diagnosing the state of the inverter (S160).

The method of diagnosing the inverter condition shown in FIG. 1 is according to one embodiment, and the order and the order of the components are not limited to the embodiment shown in FIG. 1, Changed or deleted.

FIG. 2 is a flowchart showing a process of acquiring an identification number of an inverter corresponding to identification information of driving software, and FIG. 3 is a flowchart showing a process of diagnosing the status of an inverter based on abnormal log data. Hereinafter, steps S110 to S160 described above with reference to Figs. 1 to 3 will be described in detail.

In the present invention, the inverter includes a power conversion module for converting a DC power source to an AC power source, a PWM signal generation module for applying a PWM pulse to a switching device constituting the power conversion module, and a driving system driven by the inverter, And a microcomputer for applying a voltage command value to the PWM signal generating module based on the output signal of the PWM signal generating module.

The driving software is software for controlling the operation of the inverter and may be software installed in the above-mentioned microcomputer. The driving software can process the state data of the driving system through a predetermined algorithm to generate an output value for controlling the inverter.

For example, when the inverter drives the motor, the drive software processes data on the motor temperature, rotation speed, and vibration acceleration (state data) through an algorithm to generate a voltage command value (output value) for controlling the output of the inverter, Lt; / RTI >

The apparatus dedicated to the state diagnosis (hereinafter referred to as diagnostic equipment) can be connected to the inverter and load the driving software installed in the inverter (S110). In other words, the diagnostic equipment can transfer the above described drive software to the internal memory of the diagnostic equipment.

When the driving software is loaded, the diagnostic equipment can recognize the identification number of the inverter on which the driving software is mounted based on the identification information of the loaded driving software (S120).

The driving software may have unique identification information. The identification information is software information, and may include information necessary for specifying the running software such as a software name, a type, and a version.

The identification information of the drive software may correspond to the identification number of the inverter. In other words, the inverter having the same identification number can be loaded with driving software having the same identification information.

In the internal database of the diagnostic equipment, the identification information of the drive software and the identification number of the inverter corresponding thereto can be stored in advance. Accordingly, the diagnostic equipment can recognize the identification information of the drive software and recognize the identification number of the inverter corresponding to the identification information of the drive software with reference to the database.

The above-described database may be provided in a cloud server instead of inside the diagnostic equipment. At this time, the diagnostic equipment may recognize the identification number of the inverter corresponding to the identification information of the driving software by referring to the database through wireless communication with the cloud server.

Hereinafter, the process of recognizing the identification number of the inverter according to whether the identification information of the driving software is grasped will be described in detail with reference to FIG.

Referring to FIG. 2, the diagnostic equipment loads the driving software SW (S110) and obtains the identification information of the driving software (S210). When the identification information of the software is obtained, the diagnostic equipment can acquire the identification number of the inverter corresponding to the identification information (S220) as described above.

Alternatively, if the driving software does not have separate software information, the diagnostic equipment may not be able to grasp the identifying information of the driving software. In this case, the diagnostic equipment can recognize the source code of the driving software and recognize the identification number of the inverter corresponding to the source code by referring to the database.

In the internal database of the diagnostic equipment, the source code of the driving software and the identification information corresponding to the source code may be stored in advance. When the identification information of the driving software is not obtained, the diagnostic equipment identifies the source code itself of the driving software (S230), and recognizes the identification information corresponding to the identified source code by referring to the database.

The above-described database can be provided in the cloud server, not in the interior of the diagnostic equipment, as described above.

In order to recognize the identification information corresponding to the source code, the diagnostic equipment can compare the source code of the loaded running software with the source code stored in the database. More specifically, the diagnostic equipment can compare the similarity of the text that constitutes the source code of the loaded running software with the text that constitutes the source code stored in the database.

Accordingly, the diagnostic equipment can search for the same or similar source code as the source code of the loaded driving software among the source codes stored in the database, and recognize the identification information corresponding to the retrieved source code (S240).

When the identification information of the loaded driving software is obtained according to the above-described method, the identification number of the inverter corresponding to the identification information can be obtained (S220).

Alternatively, if the identification number corresponding to the source code of the loaded driving software is not recognized, the diagnostic equipment can receive the identification number of the inverter from the user (S250).

In other words, if there is no source code in the database that is the same as or similar to the source code of the loaded drive software, the diagnostic equipment can receive the identification number of the drive on which the loaded drive software is mounted.

If the identification number of the inverter is inputted from the user, the diagnostic equipment may store the inputted identification number in the database (DB) so as to correspond to the source code of the driving software (S260). Accordingly, the database may additionally store the new source code loaded from the inverter and the identification number of the corresponding inverter.

As described above, the present invention can easily extend the diagnosis target by additionally storing the source code of the new software installed in the inverter and the identification number of the inverter in the database.

For example, if the source code of the new software and the identification number of the corresponding inverter are additionally stored in the database of the cloud server, the same diagnostic equipment used at other sites can also diagnose the new software, It is easy to expand.

Referring again to FIG. 1, if the identification number of the inverter is recognized, the diagnostic equipment can identify the abnormal log data generated by the driving software based on the design information corresponding to the identification number (S130).

Design information of the inverter corresponding to the identification number of the inverter may be stored in advance in the database of the cloud server connected via wireless communication with the internal database of the diagnostic equipment or the diagnostic equipment. Accordingly, the diagnostic equipment can recognize the identification number of the inverter and recognize the design information corresponding to the identification number of the inverter by referring to the database.

The design information may include information about the algorithm of the driving software and the input / output permission range of the process according to each algorithm. In other words, the design information may include an input allowable range for an input value input to the drive software and an output allowable range for an output value output from the drive software.

For example, when the drive software generates the voltage command value based on the state data of the motor as described above, the design information includes each state data (e.g., the temperature of the motor, the rotational speed, the vibration acceleration, May be included.

On the other hand, the driving software can generate log data at predetermined time intervals. The log data may include an input value input to the driving software at a specific time and an output value output from the driving software at a specific time.

The diagnostic equipment can identify the abnormal log data by comparing the log data generated by the loaded drive software with the design information described above.

More specifically, the diagnostic equipment can identify, as abnormal log data, log data in which the output value of the driving software out of the output allowable range included in the design information among the log data generated in the driving software.

In other words, the diagnostic apparatus compares the output value included in the log data with the output allowable range included in the design information, and if the output value of the comparison result is out of the allowable range, the log data can be identified as abnormal log data. On the other hand, if the output value included in the log data is within the allowable output range, the diagnostic equipment can identify the log data as normal log data.

On the other hand, unlike the above, the driving software installed in the inverter can identify the abnormal log data by itself. In other words, the abnormal log data may be identified through the diagnostic equipment as described above, or may be identified by the drive software installed in the inverter.

More specifically, when information on the output allowable range is preset in the drive software, the drive software can identify the log data as abnormal log data when the output value of the log data is out of the allowable output range. In this case, if the diagnostic equipment loads the running software, the identified abnormal log data may also be loaded together.

The diagnostic equipment can determine whether the input value inputted to the driving software is normal by referring to the abnormal log data and the design information of the inverter (S140).

Hereinafter, the process of diagnosing the inverter status according to the input value and the virtual log data will be described in detail with reference to FIG.

Referring to FIG. 3, after the abnormal log data is identified (S130), the diagnostic equipment can determine whether the abnormal log data is normal or not (S310). More specifically, the diagnostic equipment can determine whether the input value is normal by comparing the input value included in the abnormal log data with the input allowable range included in the design information.

In other words, if the input value is within the allowable range, the diagnostic device can determine that the input value is normal, and if the input value is out of the allowable range, the input value can be judged to be abnormal.

If it is determined that the input value is abnormal, the diagnostic equipment can diagnose the state of the inverter to an unsuitable state (S320).

The non-conforming state here may mean that the abnormal log data is not suitable for determining the state of the inverter. That is, the input value is a parameter determined by the state of the drive system driven by the inverter, and may be independent of the state of the inverter.

In other words, the abnormal log data including the abnormal input value is generated due to the abnormality of the drive system rather than the state of the inverter. Therefore, if the input value is determined to be abnormal, the diagnostic apparatus can diagnose the state of the inverter to be in an unsuitable state have.

On the other hand, if it is determined that the input value is normal, the diagnostic equipment can generate virtual log data by re-inputting the input value to the loaded drive software (S150). More specifically, the diagnostic equipment may generate virtual log data including an input value determined to be normal (hereinafter referred to as a normal input value) and a virtual output value for a normal input value (S330).

More specifically, the diagnostic equipment can execute the running software loaded from the inverter via the internal memory and enter the running drive software normal input values. The driving software can generate a virtual output value by performing a process on a normal input value through an internal algorithm and generate virtual log data including a normal input value and a virtual output value.

The diagnostic equipment can diagnose the fault condition of the inverter according to whether the generated virtual log data and abnormal log data match (S160).

More specifically, the diagnostic equipment can confirm whether or not the virtual log data generated through the driving software executed in the diagnostic equipment matches the abnormal log data generated through the driving software installed in the inverter.

Here, whether or not the log data is consistent may be a match of the output values included in the log data. In other words, whether or not the log data is matched may be a match between the output value included in the virtual log data and the output value included in the abnormal log data.

That is, the diagnostic equipment can check whether the output value of the normal input value generated by the inverter and the virtual output value of the normal input value generated by the diagnostic equipment are the same.

If the virtual log data matches the abnormal log data, the diagnostic equipment can diagnose that the drive software loaded in the inverter is faulty (S360).

In other words, if the virtual output value contained in the virtual log data is the same as the output value included in the abnormal log data, the diagnostic equipment can diagnose the inverter status as a drive software fault status.

That is, when the same input value is input to the same drive software executed in different hardware (inverter and diagnostic equipment), if the same output value is determined to be abnormal, the diagnostic equipment can diagnose that the drive software itself is faulty .

On the other hand, if the virtual log data does not match the abnormal log data, the diagnostic equipment can diagnose that the hardware constituting the inverter is faulty (S350).

In other words, if the virtual output value contained in the virtual log data is different from the output value included in the abnormal log data, the diagnostic equipment can diagnose the inverter status as a hardware failure status.

That is, if the same input value is input to the same drive software executed in different hardware (inverter and diagnostic equipment), if the generated output values are different, the hardware constituting the inverter may be diagnosed as faulty.

For example, when the normal input value is input to the driving software executed in the inverter, an output value that is determined to be abnormal is generated. On the other hand, when the normal input value is input to the driving software executed in the diagnostic equipment, , The diagnostic equipment can diagnose that the hardware constituting the inverter is faulty.

Here, the hardware constituting the inverter may be at least one of the power conversion module, the PWM signal generation module, and the microcomputer.

As described above, according to the present invention, the log data generated in the drive software executed in the inverter is compared with the log data generated in the drive software executed in the apparatus dedicated for state diagnosis, thereby diagnosing the state of the inverter, .

More specifically, it can be determined whether the cause of the failure of the inverter is caused by a failure of the software installed in the inverter or a failure of the hardware constituting the inverter. In addition, it can be seen that the state of the inverter is inadequate to diagnose due to the state of the drive system.

The above-described present invention can be performed through a device dedicated to state diagnosis connected to an inverter. Thus, according to the present invention, it is possible to improve the speed of diagnosis by diagnosing the state of the inverter directly in the field without analyzing it in a separate PC.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But the present invention is not limited thereto.

Claims (10)

A method for diagnosing the condition of an inverter using a dedicated equipment for diagnosis of status,
Loading driving software installed in the inverter;
Recognizing the identification number of the inverter on which the driving software is installed based on the identification information of the loaded driving software;
Identifying abnormal log data generated in the driving software based on design information corresponding to the recognized identification number;
Determining whether the input value input to the driving software is normal with reference to the identified abnormal log data and the design information;
Generating virtual log data by re-inputting the input value to the loaded drive software if the input value is determined to be normal; And
Diagnosing the status of the inverter to be faulty according to whether or not the generated virtual log data matches the abnormal log data
How to diagnose inverter condition.
The method according to claim 1,
The step of recognizing the identification number of the inverter on which the driving software is mounted based on the identification information of the loaded driving software
Recognizing the identification information of the loaded drive software and recognizing the identification number of the inverter corresponding to the identification information with reference to the database.
3. The method of claim 2,
If the identification information of the loaded driving software is not obtained, determining the source code of the driving software and recognizing the identification number of the inverter corresponding to the source code with reference to the database.
The method of claim 3,
Receiving an identification number of the inverter from a user if the identification number of the inverter corresponding to the source code is not recognized and storing the input identification number in the database so as to correspond to the source code; Way.
The method according to claim 1,
Identifying the abnormal log data generated in the driving software based on the design information corresponding to the recognized identification number
And identifying log data in which the output value of the drive software is out of the allowable output range included in the design information, from the log data generated in the drive software, as the abnormal log data.
The method according to claim 1,
Wherein the step of determining whether the input value inputted to the driving software is normal with reference to the identified abnormal log data and the design information
And comparing the input value included in the abnormal log data with an input allowable range included in the design information to determine whether the input value is normal.
The method according to claim 6,
Further comprising the step of diagnosing the inverter to a non-conforming state when it is determined that the input value is abnormal.
The method according to claim 1,
And generating virtual log data by re-inputting the input value to the loaded drive software if the input value is determined to be normal
Further comprising generating the virtual log data including the input value and a virtual output value for the input value.
The method according to claim 1,
The step of diagnosing the status of the inverter as failure according to whether or not the virtual log data and the abnormal log data match
And diagnosing that the drive software is faulty if the virtual log data matches the abnormal log data.
The method according to claim 1,
The step of diagnosing the status of the inverter as failure according to whether or not the virtual log data and the abnormal log data match
And diagnosing that the hardware constituting the inverter is faulty if the virtual log data does not match the abnormal log data.

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