KR100440144B1 - Apparatus for in line inspection of transmission and method thereof - Google Patents

Abstract

In order to ensure the quality of the product in the mass production line by analyzing and evaluating the noise of the gear noise and the operation state of the assembled single-state gearbox in the quality inspection of the automotive transmission.

The present invention is arranged in conjunction with the last production line of the transmission production, the anechoic chamber to shield the inflow of external noise during quality inspection, and connected through the input shaft and the clutch of the transmission installed in the anechoic chamber, the drive unit driven by the speed condition for each gear stage A weight flywheel connected to the output shaft of the transmission to provide a load condition close to field travel of the vehicle, a microphone installed at a predetermined position in the anechoic chamber for inputting an acoustic signal generated by driving the transmission; The signal analyzer analyzes the quality of the transmission by separating the sound signal collected through the phone into frequency components and sound pressure levels, and the overall operation control for checking the quality of the transmission and the analysis results detected by the signal analyzer. In the central processing unit and the central control unit The control panel controls the operation of the drive unit according to the set test schedule and the quality control results evaluated by the central control unit are stored and provided as data for rearranging the manufacturing process, adjusting the occurrence of defects, later research and development and analyzing the results. The display device includes a storage device, a monitor and a printer, and a display device for outputting a quality inspection result to the operator.

Therefore, after connecting the transmission of the completed single-piece state to the quality inspection device stably, and set the speed conditions for each gear stage, collect the sound generated by driving the transmission at the corresponding speed conditions through the drive unit, and the collected sound signal Is divided into a frequency signal and a sound pressure signal by FFT conversion, and the quality evaluation and the results are stored.It is determined whether the inspection is completed for the maximum speed condition of the final gear stage. Finally evaluate and output and save the result.

Description

Inline inspection device and method of transmission {APPARATUS FOR IN LINE INSPECTION OF TRANSMISSION AND METHOD THEREOF}

The present invention relates to a quality inspection apparatus for a vehicle transmission, and more particularly, to ensure the quality of the product in the mass production line by analyzing and evaluating the presence or absence of gear noise and operating conditions of the assembled single-state transmission by noise measurement. The present invention relates to an inline inspection apparatus and a method of a transmission.

In general, the quality inspection of the transmission for a vehicle is performed in a single assembly state, the conventional quality inspection apparatus, as can be seen in the attached Fig. 9, the inspection target transmission (1) of the assembled single unit state, and Control panel 4 and inspection apparatus for adjusting the operation of each shift stage and the speed for each shift stage in driving the automatic transmission 1 of the inspection target through the control of the driving unit 2 and the driving unit 2 for driving. It consists of a worker (5) operating and evaluating the transmission (1) of the inspection target according to the progress of the inspection.

The operation of inspecting the quality of the conventional automobile transmission having the configuration as described above is as follows.

First, when the transmission 1 in a single unit state is assembled to a quality inspection device arranged at the final production line of the transmission, the worker 5 is introduced through a conveyor system or a hanger system not shown. Manually connects the output shaft of the drive unit 2 to the input shaft of the transmission 1, and connects the mass fly wheel (3) corresponding to the field load conditions of the vehicle to the output shaft of the transmission (1).

When the connection for the quality inspection test is completed as described above, the operator (5) by operating the operation panel (4) in accordance with the set quality inspection test specifications step by step for the maximum rotational speed from the minimum rotational speed for each set time step by step In the state in which the transmission 1 is driven, the worker 5 evaluates the quality of the transmission by using his / her sense of hearing to determine whether there is an abnormality in the operating state, whether there is a manufacturing coupling, or whether the shift operability is abnormal.

As described above, the quality inspection of the transmission performed in the related art is not systematic because it depends on the hearing of the worker, and there is a problem that the objectivity of the product cannot be secured due to the subjectiveness of the worker. There is a problem that the reliability is different, there is a disadvantage that the operation does not proceed if the worker is to leave the surroundings.

In addition, the noise generated from the drive unit and the noise generated from the transmission are combined, so that the operator extracts only the noise of the transmission with his / her own hearing, and includes a number of disadvantages.

The present invention has been invented to solve the above problems, the purpose of which is the quality of the production line by frequency analysis and sound pressure level analysis through noise measurement to determine the presence of gear noise and operating abnormality of the assembled single-state transmission To ensure the quality of the product, and to obtain the results of systematic and objective inspection as a result of the quality inspection for the inline system, and to the reliability of the mass production quality by quality inspection under various conditions beyond the standard of simple evaluation based on the operator's experience. To provide.

1 is a configuration block diagram of an inline inspection apparatus of a transmission according to the present invention.

Figure 2 is a state diagram showing the connection relationship between the drive unit and the clutch in the in-line inspection apparatus of the transmission according to the present invention.

Figure 3 is a detailed configuration of the noise analyzer in the in-line inspection device of the transmission according to the present invention.

4 is a flowchart of an embodiment of performing a quality inspection in the inline inspection apparatus of a transmission according to the present invention.

FIG. 5 is a flowchart illustrating an operation of frequency spectrum analysis when a quality check is performed in the flowchart of FIG. 4; FIG.

FIG. 6 is a diagram illustrating frequency spectrum analysis in performing the quality inspection of FIG. 5. FIG.

7 is a flowchart illustrating a sound pressure level analysis process in the quality inspection of FIG. 4.

8 illustrates sound pressure level analysis in performing the quality inspection of FIG. 7.

9 is a block diagram of an inline inspection apparatus of a transmission applied in the prior art.

The present invention for realizing the above object is an anechoic chamber that is arranged in conjunction with the transmission production last process line to shield the inflow of external noise during quality inspection; A driving unit connected to the input shaft of the transmission installed in the anechoic chamber and the clutch and driven under a speed condition for each shift stage; A weight fly wheel connected to the output shaft of the transmission, the load flywheel providing a load condition close to field travel of the vehicle; A microphone installed at a predetermined position in the anechoic chamber for inputting an acoustic signal generated by driving of a transmission; A signal analyzer for analyzing the quality state of the transmission by separating the sound signal collected through the microphone into frequency components and sound pressure levels; A central processing unit for evaluating the quality by analyzing the overall operation control for the quality inspection of the transmission and the analysis result detected by the signal analyzer under the speed condition for each shift stage; An operation panel for controlling the operation of the driving unit according to a set test schedule applied from the central controller; A storage device for storing the quality inspection results evaluated by the central control unit and providing the data for data rearrangement, defect generation adjustment, future research and development, and result analysis; Comprising a monitor and a printer, it characterized in that it comprises a display device for outputting the quality inspection results to the operator, the final evaluation in the central control unit.

The signal analyzer may include a signal amplifier for amplifying an analog signal collected by a microphone to a predetermined level; An A / D converter for converting the amplified signal into an analog signal; A filter for filtering the digitally converted sound signal to a predetermined band and extracting only the signal components of a desired band; Characterized in that the FFT converter to FFT transform the filtered sound signal to the signal of the frequency component and the sound pressure component.

In addition, the present invention comprises the steps of stably connecting the transmission in the state of the finished single product to the quality inspection device and then setting the speed condition for each gear stage; Collecting sound generated by driving the transmission under a speed condition through the driver; Separating the collected sound signal into a frequency signal and a sound pressure signal by FFT conversion and storing the quality evaluation and the result; Determining whether the inspection is completed for the maximum speed condition of the final speed change stage by repeating the above process; If it is determined that the inspection is completed, a process of finally evaluating the quality inspection for the speed condition for each shift stage, and outputting and storing the result of the quality inspection.

In the analysis of the frequency signal, the process of calculating the total area by extracting the spectrum of each frequency band; Comparing the entire spectrum of the operation spectrum with a reference value for each frequency band in a set steady state to determine whether the calculation spectrum is included in the reference value; If it is not included in the above reference value is determined as the abnormality of the transmission in the speed condition of the frequency band and extracts the result, if included in the reference value is determined that the assembly of the transmission is normal and includes the process of storing the result, The analysis of the signal comprises the steps of extracting the sound pressure level by separating the separated sound pressure signal for each speed condition; Comparing the extracted sound pressure level for each speed condition with a reference value set based on the sound pressure for each speed condition in a steady state to determine whether the sound pressure level falls within a range of the reference value; If it is included in the range of the reference value above, it is determined that the normal state in the speed condition, and if it is not included in the range of the reference value, it is determined that the abnormal state in the speed condition and storing the result.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As can be seen in Figure 1, the in-line inspection apparatus of the automatic transmission according to the present invention, the inspection target transmission 10, the drive unit 20, the weight flywheel 30, the microphone 40 of the assembled single unit state , Signal analyzer 50, central control unit 60, control panel 70, storage unit 80, display unit 90, and anechoic chamber 100, the anechoic chamber 100 produces the transmission 10. It is disposed in conjunction with the last process line, and is separated from the drive unit 20 to enhance the reliability during the quality inspection of the transferred transmission 10 to shield the sound source so that external noise does not flow.

The driving unit 20 connects the output shaft and the input shaft of the transmission 10 installed in the anechoic chamber 100 through the clutch 10A as shown in FIG. 3, and is driven according to the progress of the test to speed up each speed stage. Perform the operation to keep the.

The weight flywheel 30 is connected to the output shaft of the transmission 10 to provide a load condition that approximates field travel of the vehicle when the transmission 10 is driven.

The microphone 40 is installed at a predetermined position in the anechoic chamber 40 to input sound signals generated while the transmission 10 is driven under each condition.

The signal analyzer 50 analyzes the state of the transmission 10 by separating the sound signal collected through the microphone 40 into frequency components and sound pressure levels, and outputs an analysis result.

The central controller 60 analyzes the overall operation control for the quality check of the transmission 10 and the analysis result detected by the signal analyzer 50 under the speed condition for each shift stage, evaluates the quality, and then processes the result therefor. do.

The operation panel 70 controls the operation of the driving unit 20 according to the set test schedule applied from the central controller 60.

The storage device 80 stores the quality test results evaluated by the central control unit 60 in a designated area and provides the backup data for rearrangement and defect occurrence adjustment of the manufacturing process and for future research and development and result analysis.

The display device 90 is composed of a monitor and a printer, and outputs a quality inspection result which is finally evaluated by the central control device 60 to an operator.

As shown in FIG. 3, the signal analyzer 50 includes a signal amplifier 51 for amplifying an analog signal collected by the microphone 40 to a predetermined level and an analog signal for the amplified signal. An A / D converter 52 for converting a signal into a digital signal, a filter 53 for filtering the digitally converted sound signal to a predetermined band and extracting only the signal components of a desired band, and a FFT (Fast Fourier) It consists of a FFT converter that extracts the frequency components by transforming and then performs spectral analysis.

The filter 53 is composed of a 1/3 octave filter and a step adaptive filter.

Operation of performing a quality check of the transmission through the present invention including the function as described above is as follows.

The single-component transmission 10 assembled to the quality inspection device arranged in the last process line is interlocked with the line through a conveying means such as a conveyor system or a hanger system (not shown). When the operator enters the anechoic chamber 100, the operator connects the input shaft of the transmission 10 to the output shaft of the driving unit 20 installed outside the anechoic chamber 100 through the clutch 10A, as shown in FIG. 2, To the output shaft of the transmission 10 is connected to the weight fly wheel 30 providing a field load condition of the vehicle (S110).

When the connection for the quality check of the transmission 10 inline as described above is completed, the operator rechecks each part of the current connection state to detect whether the connection state is normally made (S120).

If the connection state is not made in the normal state, the rearrangement of each position and then the connection for quality inspection (S130), if it is determined that the connection state is made normally, the operator applies the set quality inspection specifications and various variable conditions The speed condition for each shift stage is set in the central controller 60 (S140).

Thereafter, when the operator 70 starts the quality inspection test by operating the driving unit 20 through the operation panel 70 in order to proceed with the quality inspection test (S150), the driving unit 20 controls the center through the operation panel 70. The transmission 10 is driven according to a quality inspection specification applied from the device 60 and is connected to the output shaft.

As described above, the gear noise generated in the state in which the transmission 10 is operated by the driving unit 20 and the noise generated in the operating state are signaled through the microphone 40 installed at a predetermined position in the anechoic chamber 100. Collected and stored in the analyzer 50 (S160).

In this case, as shown in FIG. 3, the signal analyzer 50 amplifies the sound signal in the anechoic chamber 100 collected through the microphone 40 to a predetermined level set through the signal amplifier 51 and then amplifies the signal. After converting the analog sound signal to a digital signal through the A / D converter 52, and extracts only the components of the required frequency band by filtering through the filter 53 (S160), the filtered sound signal FFT analyzer 54 After separating the signal of the frequency spectrum and the sound pressure signal through the central control unit 60 is applied to (S170) (S180).

The central control unit 60 extracts a quality evaluation result for the transmission 10 by analyzing a signal separated into a frequency spectrum and a sound pressure signal by FFT conversion through a set algorithm, and assigns the extracted result to the storage device 80. The data is stored in the address area (S190).

Repeating the above test is repeatedly performed according to the speed condition for each shift stage of the set inspection specification, and it is determined whether the inspection for the maximum speed condition of the final shift stage is completed (S200).

In the above judgment, if the quality check for the maximum speed condition of the final speed change stage is not completed, the test process is repeatedly performed to adjust the speed and speed conditions sequentially so that the maximum speed condition check of the final speed change stage is completed. (S210), when it is determined that the quality inspection for the maximum speed condition of the final shift stage is completed, the central control unit 220 performs final evaluation for each speed stage and each speed condition through the set algorithm, extracts the overall quality inspection result, and then displays it. The device 90 outputs text, graphics, or documents through the device 90 and stores them in the storage device 80 (S220) (S230).

Therefore, the operator selects and manages defective and normal products according to the evaluation result of the quality inspection, and adjusts the assembly process by tracking the cause of the defect according to the data of the quality inspection evaluation result so that only normal products can be produced.

As can be seen in FIG. 5, the quality evaluation in S190 is performed by applying a 1/3 octave filter and a step adaptive filter to the frequency signal separated by the signal analyzer 50. After extraction (S191), it is extracted into the frequency spectrum as shown in Figure 6 through the FFT transform (S192).

Subsequently, the area of the frequency spectrum for each level is calculated and compared with the set reference value as shown in FIG. 6, and then it is determined whether each frequency spectrum is included in the state below the reference value (S193) (S194) (S195).

If it is included below the reference value, it is determined to be in a normal state in the corresponding frequency band and stores the result (S196). If a frequency spectrum exceeding the reference value is detected, it is determined to be bad in the corresponding frequency band and the result is stored (S197). ).

The frequency spectrum appears in proportion to the speed of the transmission 10.

In addition, the operation of evaluating the quality test result by analyzing the sound pressure signal separated in the S190 is as shown in Figure 7 the sound pressure level detected by extracting the sound pressure level by the number of revolutions in the speed condition for each gear stage as shown in FIG. When the measured value is included in the reference value by comparing the reference value set on the basis of the level and the steady state, it is judged that the manufacturing was successful under the relevant speed condition, and the result value is stored. It is determined that the production is abnormal under the conditions and stores the result values (S190a-S190d).

As described above, the present invention is performed through the detection and analysis of noise generated during driving in the quality inspection of the completed single-state transmission, thereby ensuring systematicity and objectivity in quality control, and simple operation depending on the experience of existing workers. Improved production quality by obtaining reliable test results compared to evaluation.

Claims (8)

An anechoic chamber arranged to be linked to the final production line of the transmission and shielding the inflow of external noise during quality inspection; A driving unit connected to the input shaft of the transmission installed in the anechoic chamber and the clutch and driven under a speed condition for each shift stage; A weight fly wheel connected to the output shaft of the transmission, the load flywheel providing a load condition close to field travel of the vehicle; A microphone installed at a predetermined position in the anechoic chamber for inputting an acoustic signal generated by driving of a transmission; A signal analyzer for analyzing the quality state of the transmission by separating the sound signal collected through the microphone into frequency components and sound pressure levels; A central processing unit for evaluating the quality by analyzing the overall operation control for the quality inspection of the transmission and the analysis result detected by the signal analyzer under the speed condition for each shift stage; An operation panel for controlling the operation of the driving unit according to a set test schedule applied from the central controller; A storage device for storing the quality inspection results evaluated by the central control unit and providing the data for data rearrangement, defect generation adjustment, future research and development, and result analysis; An in-line inspection device for a transmission comprising a monitor and a printer, the display device outputting a quality inspection result that is finally evaluated by a central controller to a worker. The method of claim 1, The signal analyzer includes a signal amplifier for amplifying an analog signal collected by a microphone to a predetermined level; An A / D converter for converting the amplified signal into an analog signal; A filter for filtering the digitally converted sound signal to a predetermined band and extracting only the signal components of a desired band; An inline inspection apparatus for a transmission, comprising: an FFT converter for FFT converting a filtered sound signal into signals of frequency and sound pressure components. The method of claim 2, And said filter comprises a 1/3 octave filter and a step adaptive filter. Stably connecting a transmission of a completed single-state state to a quality inspection device and setting speed conditions for each shift stage; Collecting sound generated by driving the transmission under a speed condition through the driver; Separating the collected sound signal into a frequency signal and a sound pressure signal by FFT conversion and storing the quality evaluation and the result; Determining whether the inspection is completed for the maximum speed condition of the final speed change stage by repeating the above process; And if it is determined that the inspection is completed, a process of finally evaluating the quality inspection with respect to the speed condition for each shift stage, and outputting and storing the result. The method of claim 4, wherein The speed condition for each shift stage set for the quality inspection is inline inspection method of the transmission, characterized in that the application of a variety of load conditions. The method of claim 4, wherein The in-line inspection method of the transmission, characterized in that the quality inspection test for the speed condition for each gear stage is automatically performed according to a set algorithm. The method of claim 4, wherein The analysis of the frequency signal may include calculating a total area by extracting a spectrum of each frequency band; Comparing the entire spectrum of the operation spectrum with a reference value for each frequency band in a set steady state to determine whether the calculation spectrum is included in the reference value; If it is not included in the above reference value is determined as an abnormality of the transmission in the speed condition of the frequency band and extracts the result, and if included in the reference value it is determined that the assembly of the transmission is normal, and storing the result Inline inspection method of transmission. The method of claim 4, wherein The sound pressure signal analysis may include: extracting a sound pressure level by separating the separated sound pressure signal for each speed condition; Comparing the extracted sound pressure level for each speed condition with a reference value set based on the sound pressure for each speed condition in a steady state to determine whether the sound pressure level falls within a range of the reference value; The transmission is characterized in that it is determined to be in a normal state in the speed condition when included in the range of the reference value, and if the range is not included in the reference value range is determined to be an abnormal state in the speed condition and storing the result. Inline test method.