JP2014092504A - Abnormality determination device and abnormality determination method of automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect an unexpected abnormal sound and the abnormal sound by a complex factor.SOLUTION: The abnormality determination method for determining the abnormality by the generation of an abnormal sound in an automatic transmission 2 under a completion inspection from the vibration of the automatic transmission in the midst of the completion inspection is configured to obtain vibration data showing aging of the vibration of the automatic transmission under the complete inspection for each reference band dividing a frequency range (audible range) serving as an object of the inspection by a predetermined frequency width, compare the obtained vibration data and reference vibration data for abnormality determination generated based on a vibration data group stored in storage means for each reference band, determine that the automatic transmission under the complete inspection has an abnormality if the abnormality is recognized in either one of the reference bands, determine that the automatic transmission under the complete inspection has no abnormality when the abnormality is not recognized in all the reference bands, and add the vibration data obtained from the automatic transmission determined to have no abnormality to the vibration data group stored in the storage means.

Description

  The present invention relates to an abnormality determination device and an abnormality determination method for an automatic transmission.

  Patent Document 1 discloses an inspection device for determining which part of a gear unit (for example, an automatic transmission unit) having a plurality of gears is abnormal.

JP-A-8-43258

In this inspection apparatus, if the sound pressure corresponding to the frequency of vibration generated at a predetermined part (vibration generation part: a part provided with a gear or a bearing) exceeds a predetermined value, an abnormality (NG ) Is determined.
In the case of this inspection apparatus, an abnormality in a predetermined part can be determined, but an unexpected abnormality such as an abnormality in other parts cannot be determined.
Further, when the gear unit is an automatic transmission unit, even if no abnormality is recognized in each of a plurality of gear pairs (predetermined parts) included in the automatic transmission unit, the vibration of the automatic transmission as a whole is generated. It may be determined that there is an abnormality. The abnormality in such a case is caused by a combination of factors, and examples of such factors include the environment (temperature and humidity) in which the inspection is performed and the time period during which the inspection is performed.

  Therefore, it is required to be able to detect unexpected abnormalities and abnormalities caused by multiple factors.

The present invention is an abnormality determination device for determining an abnormality in an automatic transmission that is undergoing a completion inspection from vibrations of the automatic transmission that is undergoing the completion inspection,
Vibration detecting means for detecting vibration of the automatic transmission during the completion inspection;
Vibration data acquisition means for acquiring vibration data indicating temporal changes in vibration detected by the vibration detection means for each band obtained by dividing a frequency range to be subjected to abnormality determination by a predetermined frequency width;
Reference vibration data generating means for generating reference vibration data for abnormality determination based on the vibration data group stored in the storage means;
The vibration data and the reference vibration data are compared to determine the presence / absence of an abnormality for each band. When an abnormality is found in any one band, it is determined that the automatic transmission under completion inspection is abnormal. And, when no abnormality is recognized in all bands, an abnormality determining means for determining that there is no abnormality in the automatic transmission under completion inspection,
An abnormality determination device for an automatic transmission, comprising: data addition means for adding vibration data obtained from an automatic transmission determined not to be abnormal to a vibration data group stored in the storage means .

According to the present invention, since the presence or absence of abnormality is determined based on the change over time of the vibration of the automatic transmission during the completion inspection, rather than determining the presence or absence of abnormality based only on the peak value of vibration, The presence or absence of abnormality can be determined more accurately.
In addition, focusing on only vibrations of a specific frequency and not determining abnormalities in specific parts of the automatic transmission, focusing on all of these frequency ranges with the target of abnormality determination as a predetermined frequency range. Thus, since the presence or absence of abnormality in the entire automatic transmission is determined, it becomes possible to detect unexpected abnormality or abnormality due to multiple factors.
Furthermore, since vibration data obtained from an automatic transmission that is determined to be normal is added to the vibration data group, as the number of automatic transmissions that have undergone completion inspection increases, a reference vibration for abnormality determination Vibration data used for data generation will increase. Thereby, since the accuracy of the reference vibration data is increased by increasing the vibration data used for generating the reference vibration data, it is possible to more accurately determine whether there is an abnormality.

It is a schematic block diagram of the completion inspection apparatus of an automatic transmission. It is a block diagram of an abnormality determination apparatus. It is a figure explaining the frequency range used as the detection target of abnormality determination, and the division | segmentation per 1/3 octave band unit of this frequency range. It is a figure explaining vibration data and standard vibration-data. It is a flowchart explaining a completion inspection process. It is a flowchart explaining the abnormal noise determination test performed in parallel with each test of a completion inspection process.

Embodiments of the present invention will be described below.
FIG. 1 is a schematic configuration diagram of an automatic transmission completion inspection device.

  The completion inspection device 1 is a device that performs a completion inspection (performance test or the like) of the automatic transmission 2 that has been assembled in the final process of the manufacturing process of the automatic transmission, and the abnormality determination device 10 is an automatic transmission that is being tested. This is a device that monitors the vibration (vibration sound) of the machine 2 and determines whether there is an abnormality.

  Inside the transmission case of the automatic transmission 2 are provided a plurality of gear pairs, bearings for supporting the rotation shafts of the respective gears, and the like. After being positioned at a predetermined position of the base plate 3, the input shaft and the output shaft are connected to the input shaft coupling device 4 and the output shaft coupling device 5 for completion inspection, respectively.

When the completion inspection is started, the motor 7 and the automatic transmission control unit ATCU are controlled based on the control signal from the inspection control device 6, and the performance test and gear noise test of the automatic transmission 2 are executed. .
Various signals indicating the state of the automatic transmission 2 at the time of completion inspection are input to the inspection control device 6. For example, a pulse signal indicating the rotation speed of the output shaft or a laser vibrometer 8 is used. An acceleration signal indicating the detected vibration of the automatic transmission 2 is input to the inspection control device 6.

  The acceleration signal from the laser vibrometer 8 is also input to the abnormality determination device 10 via the inspection control device 6, and the abnormality determination device 10 is specified based on the input acceleration signal. The presence or absence of abnormality in the automatic transmission 2 is determined from the vibration (vibration sound) of the automatic transmission 2 during the completion inspection.

Hereinafter, the configuration of the abnormality determination device 10 will be described.
FIG. 2 is a block diagram of the abnormality determination device 10.
FIG. 3 is a diagram for explaining the frequency range to be detected for abnormality determination and the division of the frequency range in units of 1/3 octave band.
FIG. 4 is a diagram for explaining vibration data and reference vibration data.

  The abnormality determination device 10 includes a CPU 20, and a storage unit 30, a display unit 40, a speaker 50, and an operation input unit 60 are connected to the CPU 20 via a bus or an input / output interface (not shown). Has been.

  The storage unit 30 is composed of an information recording medium such as an HDD (hard disk drive) or a memory, for example, and stores vibration data described later, data input via the operation input unit 60, and the like.

  The display unit 40 is, for example, a liquid crystal monitor, and displays character information indicating an abnormal part (cause of abnormality) of the automatic transmission 2 when an abnormality is recognized in the automatic transmission 2.

  The speaker 50 outputs sound for notifying the abnormality when the abnormality is recognized in the automatic transmission 2 or when the cause of the abnormality of the automatic transmission 2 associated with the abnormality is unknown.

  The operation input unit 60 is, for example, a touch panel or a keyboard arranged around the display unit 40. When the cause of an abnormality that has not been identified is identified, the cause of the abnormality and the corresponding abnormal event This is an interface for inputting an instruction for registration to the storage unit 30 (abnormality cause table 32).

  The CPU 20 includes a vibration data acquisition unit 21, a reference vibration data generation unit 22, an abnormality determination unit 23, a data addition unit 24, a cause identification unit 25, a notification control unit 26, and a registration unit 27.

  The vibration data acquisition unit 21 acquires vibration data indicating a change with time of vibration of the automatic transmission 2 based on the acceleration signal input from the inspection control device 6. This vibration data is acquired for each band obtained by dividing the frequency range to be detected for abnormality determination by a predetermined frequency width.

In the embodiment, the frequency range to be subjected to abnormality determination is set to a frequency band (audible range) in which human hearing can be sensed as sound, and the vibration data has a frequency range within this audible range. Acquired for each band divided by 1/3 octave band.
In order to be able to capture the vibration of the automatic transmission 2 as sound, a 1/3 octave band is used to match the human hearing.
In the following description, a band obtained by dividing a frequency range serving as an audible range by 1/3 octave band is referred to as a “reference band”.

The reference vibration data generation unit 22 generates reference vibration data for abnormality determination for each reference band based on the vibration data group stored in the storage unit 30.
Specifically, since the vibration data group is composed of a plurality of vibration data, a change with time in the average value of vibration acceleration calculated from the plurality of vibration data is obtained for each reference band. Then, reference vibration data that defines a change with time of vibration acceleration (vibration acceleration upper limit value) as an upper limit is generated from the obtained average value with time.
In the embodiment, the vibration acceleration upper limit value (μ + 3σ) is obtained from the average value μ of vibration acceleration and the standard deviation σ of vibration acceleration, and the reference vibration data defining the change over time of the vibration acceleration upper limit value is used as the reference band. It is generated every time.

  As shown in FIG. 4, when the past vibration data is distributed within the hatched range in the figure, the time-dependent change of the average value of vibration acceleration (average value in FIG. 4) is obtained from all the past vibration data. After that, reference vibration data (see a two-dot chain line indicated by the upper limit value in FIG. 4) that defines the change with time of the vibration acceleration upper limit value is generated for each reference band.

  In the embodiment, the reference vibration data is obtained for each center frequency of a band (reference band) obtained by dividing a frequency range serving as an audible range by 1/3 octave bands. For this reason, reference vibration data is generated in the same manner in other reference bands (for example, 4000 Hz, 5000 Hz, etc.) other than the reference band having a center frequency of 3150 Hz.

  The abnormality determination unit 23 compares the vibration data and the reference vibration data for each reference band, and determines whether there is an abnormality for each reference band. If an abnormality is found in any one of the reference bands, it is determined that there is an abnormality in the automatic transmission under completion inspection. If no abnormality is found in all reference bands, the automatic transmission under completion inspection is determined. It is determined that there is no abnormality in the transmission.

For example, when a gear pair having an automatic transmission has a built-in abnormality, vibration (vibration sound) larger than expected vibration (vibration sound) is generated in the portion of the gear pair. Therefore, when vibration (vibration sound: vibration acceleration) larger than the upper limit vibration (vibration sound: vibration acceleration upper limit value) is recognized, it is determined that there is an abnormality in the reference band where such an abnormality is recognized. It is like that.
Therefore, in the case of FIG. 4, the vibration acceleration in the vibration data exceeds the upper limit value defined by the reference vibration data between the times t1 and t2, so that the center frequency is abnormal in the reference band of 3150 Hz. It will be determined that there is.

When it is determined that there is no abnormality in the automatic transmission 2, the abnormality determination unit 23 outputs the vibration data input from the vibration data acquisition unit 21 to the data addition unit 24, and determines that there is an abnormality. If it is detected, the vibration data is output to the cause identification unit 25.
To do.

The data adding unit 24 adds vibration data obtained from the automatic transmission that has been determined to be normal to the storage unit 30. As a result, the vibration data included in the vibration data group is increased by one.
Here, the vibration data is vibration data at the time of completion inspection of the automatic transmission 2 that has been determined to be normal, and there is vibration data in the storage unit 30 corresponding to the automatic transmission that has passed the completion inspection. Will do.
Therefore, as the number of automatic transmissions that have passed the completion inspection in the past increases, the vibration data included in the vibration data group increases, so the reference vibration data generated from this vibration data group is generated based on the past results. As a result, the reliability of the reference vibration data is improved.

The vibration data is stored separately for each type of automatic transmission subjected to the completion inspection and test items (such as a performance test and a gear noise test described later) in the completion inspection.
For example, when there are 100 types of automatic transmissions and two test items, a total of 200 vibration data groups exist in the storage unit 30.

Note that the vibration data may be stored separately for each environmental factor (temperature, humidity, time zone) when the completion inspection is performed, and for each factory or line where the completion inspection is performed.
This is because the influence of data variation caused by environmental factors or differences in factories where completion inspections were performed can be reflected in the reference vibration data, so that the presence or absence of abnormality can be determined more accurately.

  When it is determined that there is an abnormality in the automatic transmission during the completion inspection, the cause identification unit 25 refers to the reference band where the abnormality is recognized, the time when the abnormality is recognized, the number of times (hereinafter, referred to as an abnormal event collectively) On the basis of the error cause table 32, the presence / absence of the cause of the abnormality associated with the abnormal event is confirmed.

The abnormality cause table 32 will be described.
In the abnormality cause table 32, abnormal events and abnormal causes are registered in association with each other.
For example, if the upper limit is exceeded in the reference band of 3150 Hz in a certain time zone during the shifting from the first gear to the second gear (for example, 30 seconds after the start of the gear shifting), the cause of this abnormality is a faulty incorporation of a gear pair. As described above, an event (abnormal event) when an abnormality is determined in the automatic transmission and the cause of the abnormality are stored in association with each other in the abnormality cause table 32.
Therefore, the cause of the abnormality (or a candidate for the cause of the abnormality) can be known by referring to the abnormality cause table 32 based on the event of the abnormality that has occurred.

  The correspondence between the abnormal event and the cause of the abnormality in the abnormality cause table 32 is created based on the result of investigating the cause for each of the cases where vibration (vibration sound) abnormality has occurred in the past completion inspection. is there.

  Therefore, when it is determined that there is an abnormality in the automatic transmission 2, the cause identifying unit 25 stores the abnormality cause table 32 based on an abnormality event (vibration data) that has occurred in the automatic transmission in which the abnormality has been determined. If there is a cause of the corresponding abnormality, the data indicating the cause of the abnormality is output to the notification control unit 26. If there is no corresponding cause of the abnormality, the fact is output to the notification control unit 26.

The notification control unit 26 generates a command for displaying character information on the display unit 40 and a command for outputting an audio signal from the speaker 50.
For example, when data indicating the cause of the specified abnormality is input from the cause specifying unit 25, a command for notifying the cause of the abnormality specified by this data with text information or a voice signal is generated.
In addition, when the cause of the abnormality corresponding to the abnormal event does not exist in the abnormality cause table 32, a command for notifying the fact by text information or a voice signal is generated.
This is to notify the operator that there is an abnormality and to identify the cause of the abnormality when the cause of the abnormality is unknown.

  When the correspondence between the abnormal event whose cause of the corresponding abnormality is not registered in the abnormality cause table 32 and the cause of the new abnormality is input via the operation input unit 60, the registration unit 27 An abnormal event that has not been registered in the abnormality cause table 32 and a new cause of the abnormality are associated with each other and registered in the abnormality cause table 32.

  In addition, each functional block of the vibration data acquisition unit 21, the reference vibration data generation unit 22, the abnormality determination unit 23, the data addition unit 24, the cause identification unit 25, the notification control unit 26, and the registration unit 27 described above. Is realized by the CPU 20 included in the abnormality determination apparatus 10 executing a program stored in a ROM (not shown) or the storage unit 30.

Hereinafter, the abnormality determination process in the abnormality determination device 10 will be described while explaining the completion inspection process in the production line of the automatic transmission.
FIG. 5 is a flowchart for explaining the completion inspection process.
FIG. 6 is a flowchart illustrating an abnormal sound determination test executed in parallel with each test of the completion inspection process.

  In the completion inspection process according to the embodiment, an abnormality determination test based on vibration (vibration sound) of the automatic transmission is executed in parallel with each test of the completion inspection of the automatic transmission.

First, in the completion inspection process, the input shaft and the output shaft of the automatic transmission 2 that have completed the assembly of components such as a gear pair in the unit assembly process are respectively connected to the input shaft coupling device 4 and the output shaft coupling device 5. After that, the automatic transmission performance test is started (step 101).
From the information indicating the operation state of the automatic transmission during the performance test, it is confirmed whether or not the automatic transmission to be inspected normally operates while exhibiting the preset performance (step 102).
If no problem is found in this performance determination (step 102: OK), a gear noise test is executed (step 103).

  In this completion inspection process, an abnormal noise determination test is performed in parallel with the performance test and the gear noise test. In each of the performance test and the gear noise test, an abnormality of the automatic transmission based on vibration (vibration sound) is detected. Presence / absence is determined.

  Therefore, if no abnormality is recognized in the gear noise test (step 104: OK), whether or not it is determined in step 105 that there is an abnormality in the abnormal noise determination test performed in parallel with the performance test and the gear noise test. Is confirmed.

In the abnormality determination test, when it is determined that there is no abnormality (step 105: No), the completion inspection process is terminated.
On the other hand, when it is determined that there is an abnormality in the abnormality determination test, the line action (step 106) and the cause investigation process (step 107) are executed to investigate the cause of the abnormality based on the abnormality event. Identification will be done.

  Also, when an abnormality is recognized in the performance test (step 101) or the gear noise test (step 103) (step 102: NG or step 104: NG), the line action (step 106) and the cause of the abnormality are investigated. The process (step 107) is executed to investigate and identify the cause of the abnormality in the performance test and the gear noise test.

When the cause of the abnormality is identified, the performance test and the gear noise test are performed again on the automatic transmission that has been dealt with the cause of the abnormality of the automatic transmission, and in parallel with these tests. Then, an abnormal sound determination test is executed.
If no abnormality is found in any of the tests, the completion inspection process is terminated.

Next, the abnormal noise determination test will be described based on the flowchart of FIG.
When the abnormal noise determination test is started, the vibration data acquisition unit 21 acquires vibration data indicating a change in vibration acceleration with time from the waveform of the output signal of the laser vibrometer 8 for each reference band. (Step 201). Therefore, for example, as shown in FIG. 4, vibration data having a waveform as indicated by a solid line in the drawing is acquired for each center frequency of each reference band.

When the vibration data is acquired, the reference vibration data generation unit 22 calculates vibration acceleration calculated from a plurality of past vibration data based on the past vibration data (vibration data group) stored in the storage unit 30. The change with time of the average value is obtained for each reference band. Then, reference vibration data for defining a change with time of vibration acceleration (vibration acceleration upper limit value) as an upper limit is generated for each reference band from the obtained average value with time.
As a result, reference vibration data (see the two-dot difference line shown by the upper limit value in FIG. 4) that defines the change with time of the vibration acceleration upper limit value is generated for each reference band.

When the reference vibration data is generated, the abnormality determination unit 23 compares the vibration data and the reference vibration data for each reference band to determine whether there is an abnormality for each reference band (step 203).
In the embodiment, if there is a portion exceeding the vibration acceleration upper limit value in the vibration acceleration specified by the vibration data, it is determined that there is an abnormality in the reference band.

  If it is determined that there is no abnormality in any reference band (step 204: No), the data adding unit 24 adds the vibration data obtained from the automatic transmission that is determined to be normal to the storage unit 30. . As a result, the vibration data included in the vibration data group is increased by one. Therefore, in the abnormality determination test after the next time, the number of vibration data when generating the reference vibration data increases.

  If it is determined that there is an abnormality in any of the reference bands (step 204: Yes), the cause identifying unit 25 stores the abnormality cause table 32 in the storage unit 30 based on the vibration data of the reference band where the abnormality is recognized. With reference to this, it is confirmed whether or not the cause of the abnormality corresponding to the abnormal event specified by the vibration data exists in the abnormality cause table 32.

  When the cause of the abnormality exists (step 207: Yes), the notification control unit 26 generates a command for outputting character information and voice information for notifying the occurrence of the abnormality and the cause, and the display unit. 40 and the speaker 50. Thereby, the occurrence of the abnormality and the cause thereof are notified to the worker (step 208).

  On the other hand, when the cause of the abnormality does not exist (step 207: No), the notification control unit 26 outputs character information and voice information for notifying that the occurrence of the abnormality and the cause of the abnormality are unknown. Is output to the display unit 40 and the speaker 50. Thus, the operator is notified that the occurrence of the abnormality and the cause thereof are unknown (step 209).

As a result, the cause of the abnormality is investigated based on the abnormality event specified by the vibration data by the line action (step 106) and the investigation process (step 107) in the above-described completion inspection process (see FIG. 5). become.
Here, in the embodiment, the frequency range to be subjected to abnormality determination is set to a frequency band (audible range) in which human hearing can be sensed as sound, and human hearing is different in vibration. Vibration data is acquired in units of frequency width (1/3 octave band) that can be recognized by sound.
Therefore, if an abnormality is found in the automatic transmission under completion inspection, the test in which the abnormality is recognized is performed again, and the abnormal noise generated in the automatic transmission at that time is heard by the operator. Can be used to identify abnormal points.

When the cause of the abnormality corresponding to the abnormal event is specified, the correspondence between the abnormal event and the cause of the abnormality can be registered in the abnormality cause table 32 via the operation input unit 60. ing.
Therefore, after the fact that the cause of the abnormality is unknown and the correspondence between the abnormality event and the cause of the abnormality is input from the operation input unit 60, the abnormality cause table 32 of the storage unit 30 has an abnormality. Data defining the correspondence between the event and the cause of the abnormality is added (step 111).

Here, the laser vibrometer 8 in the embodiment corresponds to the vibration detection means in the invention, the vibration data acquisition unit 21 and step 201 correspond to the vibration data acquisition means in the invention, and the reference vibration data generation unit 22. Step 202 corresponds to the reference vibration data generation means in the invention, the abnormality determination unit 23 and step 203 correspond to the abnormality determination means in the invention, and the data addition unit 24 and step 206 correspond to the data addition means in the invention. The storage unit 30 corresponds to storage means in the invention.
Further, the cause identifying unit 25 and step 205 correspond to the abnormality cause identifying unit in the invention, and the notification control unit 26, step 208, and step 209 correspond to the reporting unit in the invention.

As described above, in the embodiment, the abnormality determination device 10 that determines an abnormality in the automatic transmission 2 that is being inspected from the vibration (vibration sound) of the automatic transmission 2 that is being inspected. A laser vibrometer 8 that detects the vibration of the automatic transmission 2 under inspection, and vibration data that indicates a change over time of the vibration detected by the laser vibrometer 8 are set to a frequency range (audible range) that is an object of abnormality determination. A reference for generating reference vibration data for abnormality determination for each reference band based on a vibration data group stored in the storage unit 30 and a vibration data acquisition unit 21 acquired for each reference band divided in units of / 3 octave bands A vibration data generation unit 22;
The vibration data and the reference vibration data are compared for each reference band to determine whether there is an abnormality for each reference band. If any abnormality is found in any one of the reference bands, the automatic transmission 2 under completion inspection is abnormal. If there is no abnormality in all reference bands, an abnormality determination unit 23 that determines that there is no abnormality in the automatic transmission under completion inspection;
A data adding unit 24 that adds vibration data obtained from the automatic transmission 2 determined to be normal to a vibration data group stored in the storage unit 30 is provided.

With this configuration, the presence / absence of abnormality is determined based on the time-dependent change in vibration (vibration sound) of the automatic transmission 2 during the completion inspection. Therefore, the abnormality is based only on the peak value of vibration (vibration sound). The presence / absence of abnormality can be determined more accurately than the case where the presence / absence is determined.
In addition, since vibration data obtained from the automatic transmission 2 determined not to be abnormal is added to the vibration data group, as the number of automatic transmissions that have undergone completion inspection increases, a criterion for abnormality determination Vibration data used for generation of vibration data will increase. Thereby, since the accuracy of the reference vibration data is increased by increasing the vibration data used for generating the reference vibration data, it is possible to more accurately determine whether there is an abnormality.

Here, in an automatic transmission having a plurality of gear pairs, the frequency band of vibration (vibration noise) generated from the gear meshing portion is determined from the gear meshing order. Only in the frequency band, the presence or absence of abnormal vibration (vibration sound) was inspected.
Therefore, it is possible to inspect only an abnormality occurring in a specific part (gear pair) determined in advance, and vibrations (vibration sounds) generated from a plurality of gear pairs in the automatic transmission act in combination, When the vibration (vibration sound) is determined to be abnormal for the entire automatic transmission, it has not been possible to cope with it.

Since the frequency range to be subjected to the abnormality determination is not limited to a specific frequency band but the entire audible range, it is possible to determine the presence or absence of vibration (vibration noise) abnormality in the entire automatic transmission.
In the case of a device that is manufactured by assembling multiple precision parts such as multiple gear pairs and bearings, such as an automatic transmission, it is predicted in advance from which part of the device an abnormality due to vibration (vibration noise) will occur Anomalies due to the combined action of vibrations (vibration sounds) of components in the apparatus are particularly difficult to predict. Therefore, when the frequency range to be subjected to abnormality determination is limited to a specific frequency band, these abnormalities that are difficult to predict cannot be detected.
As described above, by setting all the audible ranges without limiting the frequency range to be subjected to the abnormality determination, it is possible to detect the abnormality (unspecified abnormal sound) even if it is difficult to predict.

Furthermore, since the operator has conventionally determined whether or not there is an abnormality due to vibration (vibration sound) of the automatic transmission, the operator's judgment variation (threshold value variation) affects the determination of abnormality. Was exerting.
By configuring as described above, by comparing the vibration data indicating the change over time of vibration (vibration sound) and the reference vibration data generated from the vibration data group of the automatic transmission that has been determined to be free of past abnormalities. By determining the presence / absence of an abnormality, the determination of the presence / absence of an abnormality can be made more quantitatively, so the reliability of the determination of the presence / absence of an abnormality is improved.

  In addition, since it is possible to replace the determination of the presence or absence of abnormality, which has conventionally been performed by hearing, with a method of determining based on data, it is possible to perform quantitative evaluation management of unspecified abnormal sounds. In addition, since information related to unspecified abnormal noise is accumulated, it is possible to take measures against the source of the automatic transmission manufacturing process.

The storage unit 30 stores an abnormality cause table 32 that stores a correspondence relationship between an abnormal event identified from the vibration data of the reference band where the abnormality is recognized and the cause of the abnormality,
When it is determined that there is an abnormality in the automatic transmission 2 during the completion inspection, a cause identification unit that identifies the cause of the abnormality by referring to the abnormality cause table 32 based on the vibration data of the reference band in which the abnormality is recognized 25,
The notification control unit 26 that notifies the worker of the cause of the specified abnormality by causing the display unit 40 to present the information as character information or outputting the information from the speaker 50 as voice information is used.

  If comprised in this way, the cause of abnormality will be specified based on the abnormality cause table 32 memorize | stored in the memory | storage part 30, and the cause of the specified abnormality will be alert | reported via the display part 40 etc. FIG. Therefore, when adjusting the automatic transmission that is determined to be abnormal in the completion inspection, the operator can quickly know the location that needs to be adjusted.

When the cause of the abnormality corresponding to the abnormal event specified from the vibration data in the reference band where the abnormality is recognized does not exist in the abnormality cause table 32, the notification control unit 26 informs the display unit 40 of the character information. It is set as the structure which alert | reports to an operator by making it output as audio | voice information from the speaker 50, etc.,
Correspondence between an abnormal event and a new cause of an abnormality when a correspondence relationship between an abnormal event that did not have a corresponding cause of abnormality and a new abnormality cause is input via the operation input unit 60 The registration unit 27 for registering in the abnormality cause table 32 is further provided.

  If comprised in this way, it can alert | report to an operator etc. promptly that abnormality which the cause of a corresponding abnormality does not exist has arisen. Further, when the cause of the abnormality is identified, the correspondence between the identified cause of the abnormality and the event (abnormal event) when the abnormality occurs can be newly registered in the abnormality cause table 32. In the subsequent completion inspection of the automatic transmission, when a similar abnormality is detected, the cause of the abnormality can be quickly identified.

  The reference vibration data generation unit 22 obtains the change over time of the average value of vibration acceleration calculated from the plurality of vibration data constituting the vibration data group for each reference band, and becomes the upper limit from the change over time of the obtained average value. The reference vibration data for defining the change with time of the vibration acceleration (vibration acceleration upper limit value) is generated.

In the abnormality determination device 10, the vibration data of the automatic transmission determined to have no abnormality is added to the vibration data constituting the vibration data group every time the completion inspection of the automatic transmission is performed, and the reference vibration data is obtained. The population at the time of generation increases.
Therefore, if comprised as mentioned above, since reference vibration data based on past inspection results is generated, it can be determined whether there is an abnormality based on past inspection results.

The frequency range is set to a frequency band (audible range) that human hearing can detect as sound,
The reference band was configured to be a band obtained by dividing the frequency range (audible range) to be subjected to abnormality determination by a 1/3 octave band.

  The 1/3 octave band is the smallest unit that allows humans (workers) to hear vibrations as sounds, so that the worker must make a separate audibility check for an automatic transmission that is determined to be abnormal. Thus, it is possible to search for abnormal points.

An abnormality determination method for determining an abnormality in the automatic transmission 2 undergoing completion inspection from vibration (vibration sound) of the automatic transmission during completion inspection,
Obtain vibration data indicating the time-dependent change of the vibration of the automatic transmission during the completion inspection for each reference band obtained by dividing the frequency range (audible range) to be inspected by a predetermined frequency width,
The acquired vibration data and the reference vibration data for abnormality determination generated based on the vibration data group stored in the storage means are compared for each reference band,
If an abnormality is found in any one of the reference bands, it is determined that there is an abnormality in the automatic transmission under completion inspection. If no abnormality is found in all reference bands, the automatic transmission under completion inspection is determined. It is determined that there is no abnormality in
The abnormality determination method has a configuration in which vibration data obtained from an automatic transmission that is determined not to be abnormal is added to a vibration data group stored in a storage unit.

With this configuration, the presence / absence of abnormality is determined based on the time-dependent change in vibration (vibration sound) of the automatic transmission 2 during the completion inspection. Therefore, the abnormality is based only on the peak value of vibration (vibration sound). The presence / absence of abnormality can be determined more accurately than the case where the presence / absence is determined.
In addition, since vibration data obtained from the automatic transmission 2 determined not to be abnormal is added to the vibration data group, as the number of automatic transmissions that have undergone completion inspection increases, a criterion for abnormality determination Vibration data used for generation of vibration data will increase. Thereby, since the accuracy of the reference vibration data is increased by increasing the vibration data used for generating the reference vibration data, it is possible to more accurately determine whether there is an abnormality.

  Here, the completion inspection in the automatic transmission has a performance test and a gear noise test of the automatic transmission, and the abnormal sound determination test using the abnormality determination method according to the embodiment is a performance test and a gear noise test. Performed in parallel, and the final inspection passed either the performance test and the gear noise test, and the abnormal noise determination test performed in parallel with the performance test, and the abnormal noise determination test performed in parallel with the gear noise test. When no abnormality was found in the automatic transmission, the automatic transmission under completion inspection was accepted.

  With this configuration, it is only necessary to perform an abnormal noise determination test in parallel with the existing completion inspection of the automatic transmission, so vibration (vibration sound) can be achieved without greatly changing the existing completion inspection process and equipment. It is possible to determine the presence or absence of an abnormality based on.

  In the embodiment, the case where the vibration of the automatic transmission 2 is detected using the laser vibrometer 8 is exemplified, but other vibration detection means may be adopted as long as it can output a vibration waveform.

DESCRIPTION OF SYMBOLS 1 Completion inspection apparatus 2 Automatic transmission 3 Base plate 4 Input shaft coupling apparatus 5 Output shaft coupling apparatus 6 Inspection control apparatus 7 Motor 8 Laser vibrometer (vibration detection means)
10 Abnormality determination device 20 CPU
21 Vibration data acquisition unit (vibration data acquisition means)
22 Reference vibration data generation unit (reference vibration data generation means)
23 Abnormality determination unit (abnormality determination means)
24 Data addition part (data addition means)
25 Cause identification part (Abnormality cause identification means)
26 Notification Control Unit (Abnormality Notification Unit)
27 Registration Department (registration means)
30 storage unit (storage means)
32 Abnormality cause table 40 Display unit 50 Speaker 60 Operation input unit

Claims (6)

An abnormality determination device that determines an abnormality in an automatic transmission that is undergoing completion inspection from vibrations of the automatic transmission that is in completion inspection,
Vibration detecting means for detecting vibration of the automatic transmission during the completion inspection;
Vibration data acquisition means for acquiring vibration data indicating temporal changes in vibration detected by the vibration detection means for each band obtained by dividing a frequency range to be subjected to abnormality determination by a predetermined frequency width;
Reference vibration data generating means for generating reference vibration data for abnormality determination based on the vibration data group stored in the storage means;
The vibration data and the reference vibration data are compared to determine the presence / absence of an abnormality for each band. When an abnormality is found in any one band, it is determined that the automatic transmission under completion inspection is abnormal. And, when no abnormality is recognized in all bands, an abnormality determining means for determining that there is no abnormality in the automatic transmission under completion inspection,
An abnormality determination device for an automatic transmission, comprising: data addition means for adding vibration data obtained from an automatic transmission determined not to be abnormal to a vibration data group stored in the storage means . The storage means stores an abnormality cause table that stores a correspondence relationship between a band in which an abnormality is recognized and the cause of the abnormality,
When it is determined that there is an abnormality in the automatic transmission during the completion inspection, an abnormality cause identifying unit that identifies the cause of the abnormality with reference to the abnormality cause table based on the band where the abnormality is recognized;
An informing means for informing the cause of the identified abnormality;
The abnormality determination device according to claim 1, further comprising: The informing means informs that when the cause of the abnormality corresponding to the band in which the abnormality is recognized does not exist in the abnormality cause table,
When a correspondence relationship between a band that does not have a corresponding cause of abnormality and a new cause of abnormality is input via the input unit, the band that does not have the cause of abnormality is associated with the cause of the new abnormality. The abnormality determination device according to claim 1, further comprising registration means for registering in the abnormality cause table.   4. The reference vibration data generation unit generates the reference vibration data based on an average value of a plurality of vibration data constituting the vibration data group. 5. The abnormality determination device according to one item. The frequency range is set to an audible frequency range,
5. The abnormality determination device according to claim 1, wherein the band is a band obtained by dividing the frequency range to be subjected to the abnormality determination by 1/3 octave band. 6. . An abnormality determination method for determining an abnormality in an automatic transmission that is undergoing completion inspection from vibration of the automatic transmission during completion inspection,
Vibration data indicating a change with time of vibration of the automatic transmission during the completion inspection is acquired for each band obtained by dividing a frequency range to be inspected by a predetermined frequency width,
The acquired vibration data and the reference vibration data for abnormality determination generated based on the vibration data group stored in the storage means are compared for each band,
If an abnormality is found in any one band, it is determined that there is an abnormality in the automatic transmission under completion inspection. If no abnormality is found in all bands, the automatic transmission under completion inspection is determined. It is determined that there is no abnormality in
An abnormality determination method comprising: adding vibration data obtained from an automatic transmission determined not to be abnormal to a vibration data group stored in the storage means.

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