JP2010096547A - Device and method for determining abnormal noise - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abnormal noise determination device capable of accurately determining abnormal noise from a vehicle by a simple setting work by a user. <P>SOLUTION: This abnormal noise determination device 100 includes a storage means 120, an acceptance means 121, a correction means 120, a sound collection means 110, an analysis means 120 and a determination means 120. The storage means stores a determination value for determining an abnormal noise included in a sound generated from an inspection object vehicle. The acceptance means accepts setting by the user on at least either characteristic of a vehicle characteristic and a characteristic of a load surface along which the vehicle travels. The correction means corrects the determination value stored in the storage means based on the accepted characteristic. The sound collection means obtains sound data by collecting sounds generated from the vehicle. The analysis means calculates a sound pressure level in a prescribed frequency domain by performing frequency analysis of the obtained sound data. The determination means determines an abnormal noise by comparing the calculated sound pressure level with the corrected determination value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an abnormal sound determination device and an abnormal sound determination method. In particular, the present invention relates to an abnormal sound determination device and an abnormal sound determination method for determining an abnormal sound included in a sound generated from a vehicle.

  The lower sound generated from the traveling vehicle may give the user an unpleasant feeling. Abnormal noise inspection is performed on vehicles before factory shipment.

As a technique for inspecting abnormal noise, an abnormal noise determination device as shown in Patent Document 1 below is known. The abnormal sound determination device disclosed in Patent Literature 1 is determined as a sound pressure level by an inspector setting a plurality of frequency bands to be subjected to abnormal sound determination and determination parameters corresponding to each frequency band. The parameter is compared in frequency band units. According to such a configuration, the sound pressure level is determined based on the determination parameter that is different for each frequency band, so that it is possible to accurately determine the presence or absence of abnormal noise in the product.
JP 2006-126140 A

  However, in the above-described abnormal sound determination device, it is necessary to set a plurality of determination parameters for each product. In particular, when an abnormal noise generated from a traveling vehicle is inspected, it is necessary to set a determination parameter in consideration of not only the type of vehicle but also external factors such as a road surface on which the vehicle travels.

  The present invention has been made to solve the above-described problems. Accordingly, an object of the present invention is to provide an abnormal sound determination device and an abnormal sound determination method capable of accurately determining an abnormal noise of a vehicle by a simple setting operation by a user.

  The above object of the present invention is achieved by the following means.

  The abnormal sound determination apparatus of the present invention includes a storage unit, a reception unit, a correction unit, a sound collection unit, an analysis unit, and a determination unit. The said memory | storage means has memorize | stored the determination value for determining the abnormal sound contained in the sound generate | occur | produced by the test object vehicle. The accepting unit accepts a setting by a user for at least one of the characteristics of the vehicle and the characteristics of the road surface on which the vehicle travels. The correction unit corrects the determination value stored in the storage unit based on the received characteristic. The sound collecting means collects sound generated from the vehicle and acquires sound data. The analysis means performs frequency analysis on the acquired sound data to calculate a sound pressure level in a predetermined frequency region. The determination means determines the abnormal sound by comparing the calculated sound pressure level with the corrected determination value.

  The abnormal sound determination method of the present invention includes a reception stage, a correction stage, a sound collection stage, an analysis stage, and a determination stage. The reception step receives a setting by the user for at least one of the characteristics of the vehicle to be inspected and the characteristics of the road surface on which the vehicle travels. The correction step corrects a determination value for determining an abnormal sound included in the sound generated by the vehicle based on the received characteristic. The sound collecting step collects sound generated from the vehicle and obtains sound data. The analysis step performs frequency analysis on the acquired sound data to calculate a sound pressure level in a predetermined frequency region. In the determination step, the abnormal sound is determined by comparing the calculated sound pressure level with the corrected determination value.

  According to the abnormal sound determination device and the abnormal sound determination method of the present invention, the determination value is corrected based on at least one of the vehicle characteristics and the road surface characteristics. Sound can be determined accurately.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol was used for the same member in the figure.

(First embodiment)
FIG. 1 is a diagram illustrating an appearance of an abnormal sound determination device according to a first embodiment of the present invention. The abnormal noise determination apparatus according to the present embodiment corrects an evaluation line based on characteristics of a vehicle to be inspected and characteristics of a road surface on which the vehicle travels, and determines whether the abnormal noise of the vehicle is good or not based on the corrected evaluation line. To do.

  As shown in FIG. 1, the abnormal sound determination device 100 according to the present embodiment includes a microphone 110 and a device main body 120.

  The microphone 110 collects sound generated by the vehicle. The microphone 110 collects sound generated from the vehicle as sound collection means and acquires sound data. The microphone 110 is electrically connected to the apparatus main body 120 via the signal line 111, and a signal from the microphone 110 is transmitted to the apparatus main body 120. Since the microphone itself is a general microphone, detailed description is omitted.

  The apparatus main body 120 receives a signal from the microphone 110 and determines whether or not the vehicle has abnormal noise. The apparatus main body 120 is provided with an input unit 121 composed of various input buttons and an output unit 122 composed of various indicator lights and displays. Further, the apparatus main body 120 is provided with an alarm buzzer for notifying the user of the end of the determination process and a USB terminal for data communication with an external PC.

  Next, with reference to FIG. 2, the apparatus main body 120 in the abnormal sound determination apparatus 100 shown in FIG. 1 will be described in detail. FIG. 2 is a block diagram showing a schematic configuration of the abnormal sound determination device shown in FIG.

  As shown in FIG. 2, the apparatus main body 120 in the present embodiment includes an input unit 121, an output unit 122, a storage unit 123, and a calculation unit 124. The input unit 121, the output unit 122, and the storage unit 123 are electrically connected to the calculation unit 124, respectively.

  The input unit 121 includes various input buttons and is used for inputting vehicle characteristics and the like by the user. The input unit 121 accepts user settings regarding the characteristics of the vehicle and the characteristics of the road surface on which the vehicle travels as an accepting unit.

  The output unit 122 includes various indicator lamps and a display, and outputs a result of determining whether the vehicle is abnormal.

  The storage unit 123 stores sound data acquired by the microphone 110. In addition, the storage unit 123 stores, as storage means, a basic evaluation line (determination value) for determining an abnormal sound included in the sound generated in the inspection target vehicle, and a correction value for correcting the basic evaluation line. I remember it.

  The arithmetic unit 124 includes an arithmetic circuit and a filter circuit, and includes a correction unit (correction unit), an analysis unit (analysis unit), a determination unit (determination unit), a division unit (division unit), a calculation unit (calculation unit), and an extraction unit. (Extraction means) and a sound quality determination unit (sound quality determination means).

  Here, the correction unit corrects the basic evaluation line based on the vehicle characteristics and the road surface characteristics received by the input unit 121. The analysis unit performs frequency analysis on sound data acquired by the microphone 110 to calculate a sound pressure level in a predetermined frequency region, and the determination unit calculates the calculated sound pressure level and the corrected evaluation line. An abnormal noise is determined by comparison. The dividing unit divides the sound data at a predetermined time interval to generate a plurality of divided data. The calculation unit calculates a basic evaluation line based on sound data of a plurality of vehicles determined to have good abnormal sound determination results. The extraction unit extracts predetermined sound information from the sound data, and the sound quality determination unit determines whether the sound quality of the vehicle is good or not based on the sound information extracted by the extraction unit. The specific processing contents of each unit will be described later.

  According to the abnormal sound determination device 100 of the present embodiment configured as described above, the basic evaluation line is corrected based on the vehicle characteristics and the road surface characteristics set by the user, and the corrected evaluation line is used as a reference. Then, the quality of the abnormal noise of the vehicle is determined. Hereinafter, with reference to FIG. 3 to FIG. 8, an abnormal sound determination method in the abnormal sound determination apparatus 100 of the present embodiment will be described.

  First, with reference to FIG. 3, the basic processing flow in the abnormal sound determination method of the present embodiment will be described. FIG. 3 is a flowchart for explaining an abnormal sound determination method in the abnormal sound determination apparatus of the present embodiment.

  As shown in FIG. 3, in the abnormal sound determination method of the present embodiment, first, a basic evaluation line is set (step S101). More specifically, a basic evaluation line that is a set of determination values for determining an abnormal sound included in a sound generated from the vehicle is set. In the present embodiment, the sound data of a plurality of vehicles with good abnormal sound determination results are stored in the storage unit 123, and the sound data of a plurality of vehicles with good abnormal sound determination results are averaged. A basic evaluation line is calculated. The calculated basic evaluation line is stored in the storage unit 123. Note that the basic evaluation line setting process shown in step S101 need not be executed every time, and can be executed periodically. Alternatively, the basic evaluation line may be calculated by an external PC, and the basic evaluation line may be stored in the storage unit 123 via the USB terminal when the abnormal sound determination device 100 is shipped. Alternatively, the basic evaluation line may be arbitrarily set by the user.

  Next, the evaluation line is corrected (step S102). In the present embodiment, the basic evaluation line set in the process shown in step S101 is corrected based on the vehicle characteristics, road surface characteristics, temperature range, and atmospheric pressure range set by the user. Detailed description of the evaluation line correction process shown in step S102 will be described later.

  Next, the sound generated from the vehicle is measured (step S103). In the present embodiment, the noise determination device 100 is installed in the rear seat of the inspection target vehicle, and the sound generated by the vehicle is measured while the inspection target vehicle travels on the evaluation road. The measured sound is stored in the storage unit 123 as sound data.

  Next, the quality of the vehicle noise is determined (step S104). In the present embodiment, the sound data acquired in the process shown in step S103 is subjected to frequency analysis, and the sound pressure level of the sound data is compared with the evaluation line corrected in the process shown in step S102. The quality of the abnormal sound is determined. Detailed description of the abnormal sound determination processing shown in step S104 will be described later.

  Next, the sound quality of the vehicle sound is determined (step S105). In the present embodiment, various filtering processes are performed on the sound data acquired in the process shown in step S103, and the quality of the sound generated from the vehicle is determined. Detailed description of the sound quality determination process shown in step S105 will be described later.

  Then, the analysis result is output (step S106), and the process is terminated. In the present embodiment, the indicator lamp as the output unit 122 is turned on based on the determination result of the abnormal sound determination process shown in step S104 and the sound quality determination process shown in step S105.

  As described above, according to the processing of the flowchart illustrated in FIG. 3, first, the reference evaluation line is calculated and stored in the storage unit 123. Then, the basic evaluation line is corrected based on various settings by the user, and the quality of the abnormal noise of the vehicle is determined based on the corrected evaluation line. In addition, the quality of the sound generated by the vehicle is determined. Hereinafter, each process shown in the flowchart of FIG. 3 will be described in detail with reference to FIGS. 4 to 8.

  First, the evaluation line correction process shown in step S102 of FIG. 3 will be described with reference to FIG. FIG. 4 is a flowchart for explaining the evaluation line correction process shown in step S102 of FIG.

  As shown in FIG. 4, in the evaluation line correction process according to the present embodiment, first, user settings regarding the characteristics of the vehicle to be inspected are accepted (step S201). In the present embodiment, one vehicle size is selected by a user's button operation from among four vehicle sizes (S, M, L, and LL) that are classified in advance. The setting is accepted.

  Next, a first correction value K corresponding to the characteristics of the vehicle is determined (step S202). In the present embodiment, as shown in Table 1 below, the first correction value K is preset for each vehicle size, and the first correction corresponding to the characteristics of the vehicle set in the process shown in step S201. The value K is determined.

  In general, as the size of the vehicle to be inspected is smaller, the sound in the passenger compartment tends to increase overall. For this reason, when the vehicle to be inspected is a small car (S), if the evaluation line is not set more gently than the large car (LL), it may be determined that a general sound is abnormal. Therefore, the first correction value K is set so that the sound pressure level of the evaluation line after correction increases as the vehicle size decreases.

  Next, the setting by the user regarding the characteristics of the road surface on which the vehicle travels is accepted (step S203). In the present embodiment, setting of the road surface characteristics is performed by selecting one road surface by a user's button operation from three road surfaces (paved road, cobblestone road, gravel road, etc.) classified in advance. Accepted.

  Next, a second correction value R corresponding to the characteristics of the road surface on which the vehicle travels is determined (step S204). In the present embodiment, as shown in Table 2 below, the second correction value R is preset for each road surface, and the second correction value corresponding to the road surface characteristics set in the process shown in step S203. R is determined.

  In general, the larger the road surface unevenness, the greater the overall noise in the passenger compartment of the traveling vehicle. For this reason, if the running road is a gravel road with large unevenness (unpaved road), if the evaluation line is not set sweeter than a paved road with small unevenness, it will be judged as abnormal noise up to a general sound. There is a risk that. Therefore, the second correction value R is set so that the sound pressure level of the evaluation line after correction increases as the road surface unevenness increases.

  Next, the setting by the user about the temperature around the vehicle is accepted (step S205). In the present embodiment, a temperature setting is accepted by selecting one temperature range from among three preset temperature ranges by a user's button operation.

  Next, a third correction value T corresponding to the temperature range is determined (step S206). In the present embodiment, as shown in Table 3 below, a third correction value T is preset for each temperature range, and the third correction value corresponding to the temperature range selected in the process shown in step S205. T is determined.

  In general, the lower the ambient temperature, the greater the overall noise in the passenger compartment of the traveling vehicle. For this reason, when the ambient temperature is low, if the evaluation line is not set sweeter than when the temperature is high, there is a possibility that even a general sound is determined to be abnormal. Therefore, the third correction value T is set so that the sound pressure level of the evaluation line after correction increases as the temperature decreases.

  Next, the setting by the user about the atmospheric pressure around the vehicle is accepted (step S207). In the present embodiment, setting of the atmospheric pressure is accepted by selecting one atmospheric pressure range from among the three atmospheric pressure ranges set in advance by a user's button operation.

  Next, a fourth correction value A corresponding to the atmospheric pressure range is determined (step S208). In the present embodiment, as shown in Table 4 below, a fourth correction value P is preset for each atmospheric pressure range, and the fourth correction value corresponding to the atmospheric pressure range selected in the process shown in step S207. A is determined.

  In general, the higher the ambient atmospheric pressure, the greater the overall noise in the passenger compartment of the traveling vehicle. For this reason, when the surrounding atmospheric pressure is high, if the evaluation line is not set more gently than when the atmospheric pressure is low, there is a possibility that even a general sound is determined to be an abnormal sound. Therefore, the fourth correction value A is set so that the higher the atmospheric pressure, the higher the sound pressure level of the corrected evaluation line.

  Then, the basic evaluation line is corrected (step S209), and the process ends. In the present embodiment, the basic evaluation line is corrected based on the first to fourth correction values K, R, T, and A determined by the processing shown in steps S201 to S208. Specifically, as shown in the following equation (1), the first to fourth correction values K, R, T, and A are included in the basic evaluation line P (f) expressed by the frequency function P (f). By adding, the corrected evaluation line P ′ (f) is calculated.

Evaluation line P ′ (f) = Basic evaluation line P (f) + K + R + T + A (1)
FIG. 5 is a diagram for explaining processing for correcting the basic evaluation line.

  The broken line in FIG. 5 indicates the basic evaluation line P (f) stored in advance, and the solid line indicates the corrected evaluation line P ′ (f). In FIG. 5, the horizontal axis represents frequency, and the vertical axis represents sound pressure level.

  As shown in FIG. 5, in the evaluation line correction process of the present embodiment, correction is performed so that the basic evaluation line P (f) is translated upward or downward by adding a correction value corresponding to the setting by the user. Is done. In other words, the evaluation line is corrected in a direction in which the abnormal sound determination becomes sweeter or more severe, based on user settings for vehicle characteristics, road surface characteristics, temperature range, and atmospheric pressure range.

  As described above, according to the processing of the flowchart shown in FIG. 4, first, the vehicle size, road surface, temperature range, and atmospheric pressure range are set by the user's button operation, and the correction value is determined according to these settings. Then, the basic evaluation line is corrected based on the determined correction value. According to such a configuration, an evaluation line for determining abnormal noise can be set by a simple button operation by the user.

  In addition, since the influence degree with respect to the evaluation line of temperature and temperature is small compared with the vehicle size and the unevenness | corrugation of a road surface, the process shown to FIG.4 S205-S208 may be abbreviate | omitted. Or the process shown to step S205-S208 of FIG. 4 may be performed every several months according to the change of a season.

  Next, with reference to FIG. 6, the abnormal sound determination process shown in step S104 of FIG. 3 will be described in detail. FIG. 6 is a flowchart for explaining the abnormal sound determination process shown in step S104 of FIG.

  As shown in FIG. 6, in the abnormal sound determination process according to the present embodiment, first, sound data is divided at predetermined time intervals (step S301). In the present embodiment, the sound data acquired in the process shown in step S103 of FIG. 3 is divided to generate a plurality of time-division sound data. Here, the predetermined time interval is a time that is short enough to detect a sound suddenly generated due to vibration of the vehicle traveling on the evaluation road, for example, 0.1 to 1 second. It is set in the range.

  Next, one time division sound data is selected from the plurality of time division sound data (step S302). In the present embodiment, one time-division sound data is selected from the plurality of time-division sound data generated in the process shown in step S301 so that the time-division sound data from the measurement start time is sequentially analyzed. Selected.

  Next, the selected time division sound data is subjected to filtering processing (step S303). In the present embodiment, prior to the subsequent frequency analysis process, the time-division sound data divided by the process shown in step S301 is subjected to a filtering process, so that the noise included in the time-division sound data and the frequency band not to be analyzed Data is removed.

  Next, fast Fourier transform (hereinafter referred to as FFT) analysis is performed (step S304). In the present embodiment, FFT is performed on the time-division sound data filtered in the process shown in step S303, and a sound pressure level (sound pressure spectrum) in a predetermined frequency region is calculated.

  Next, the calculated sound pressure level is compared with the corrected evaluation line P ′ (f) (step S305). In the present embodiment, the sound pressure level of the sound data calculated in the process shown in step S304 is compared with the evaluation line P ′ (f) corrected by the above-described evaluation line correction process.

  Then, abnormal noise is counted (step S306). In the present embodiment, as shown in FIG. 7, a sound having a sound pressure level that exceeds the corrected evaluation line P ′ (f) is determined as an abnormal sound, and the number of abnormal sounds (for example, 3) is counted. The

  Then, it is determined whether or not the counted number of abnormal sounds is less than an allowable value (step S307). When the counted number of abnormal sounds is less than the allowable value (step S307: YES), it is determined that the abnormal noise of the vehicle is good (step S308), and the process proceeds to step S310 and subsequent steps. On the other hand, if the counted number of abnormal sounds is equal to or greater than the allowable value (step S307: NO), the abnormal noise of the vehicle is determined to be defective (step S309), and the process proceeds to step S310 and subsequent steps.

  Next, it is determined whether or not all of the time-division sound data has been determined to be abnormal (step S310). When all the time-division sound data are not determined to be abnormal sounds (step S310: NO), the processes in and after step S302 are repeated until all the time-division sound data are determined to be abnormal sounds. On the other hand, when all the time-division sound data are determined to be abnormal sounds (step S310: YES), the process is terminated.

  As described above, according to the processing of the flowchart shown in FIG. 6, the sound data of the sound generated in the vehicle is frequency-analyzed and compared with the corrected evaluation line, thereby determining whether or not the abnormal sound of the vehicle is good. The At this time, by dividing the sound data into a plurality at predetermined time intervals, it is possible to reliably detect a sound suddenly generated due to the vibration of the vehicle or the like without averaging the sound data. Moreover, erroneous determination is prevented by counting the number of abnormal sounds to determine whether the vehicle abnormal noise is good or bad.

  Then, according to the abnormal sound determination device and the abnormal sound determination method of the present embodiment, the evaluation line is corrected by the user setting the vehicle characteristics and the road surface characteristics, and the vehicle is determined based on the corrected evaluation lines. The quality of the abnormal sound is determined. Therefore, it is possible to accurately determine whether the vehicle noise is good or not by a simple setting operation by the user.

  Finally, with reference to FIG. 8, the sound quality determination process shown in step S105 of FIG. 3 will be described in detail. FIG. 8 is a flowchart for explaining the sound quality determination process shown in step S105 of FIG.

  As shown in FIG. 8, in the sound quality determination process of the present embodiment, first, an acoustic filtering process is performed on sound data (step S401). In the present embodiment, various acoustic filtering processes are performed on the sound data acquired in the process shown in step S103 of FIG. 3, and predetermined sound information is acquired. Here, the predetermined sound information is obtained by quantifying sensory measures such as loudness, sharpness, and roughness. In addition, since the acoustic filter itself for extracting these sound information is a general acoustic filter, detailed description is abbreviate | omitted.

  Then, it is determined whether or not the value of the sound data subjected to the acoustic filtering process is less than an allowable value (step S402). In the present embodiment, it is determined whether or not the value of the sound data subjected to the acoustic filtering process in the process shown in step S401 is less than the allowable value.

  If the value of the sound data subjected to the acoustic filtering process is less than the allowable value (step S402: YES), it is determined that the sound quality of the sound generated by the vehicle is good (step S403), and the process is terminated. On the other hand, if the value of the sound data subjected to the acoustic filtering process is equal to or greater than the allowable value (step S402: NO), it is determined that the sound quality of the sound generated in the vehicle is poor (step S404), and the process is terminated.

  As described above, according to the process of the flowchart shown in FIG. 8, the sound filtering process for extracting predetermined sound information from the sound data is performed, and the quality of the sound generated in the vehicle is determined. . According to such a configuration, it is possible to determine whether the sound quality of the sound generated in the vehicle is good or bad in addition to the determination of the abnormal sound included in the sound generated in the vehicle.

  As described above, the described embodiment has the following effects.

  (A) The abnormal sound determination device of the present embodiment includes a storage unit, an input unit, a correction unit, a microphone, an analysis unit, and a determination unit. The storage unit stores a basic evaluation line for determining an abnormal sound included in the sound generated in the inspection target vehicle. The input unit receives input from the user regarding the characteristics of the vehicle and the characteristics of the road surface on which the vehicle travels. A correction | amendment part correct | amends the basic evaluation line memorize | stored in the memory | storage part based on the received characteristic. The microphone collects sound generated from the vehicle and acquires sound data. The analysis unit performs frequency analysis on the acquired sound data and calculates a sound pressure level in a predetermined frequency region. The determination unit determines abnormal noise by comparing the calculated sound pressure level with the corrected evaluation line. Therefore, since the basic evaluation line is corrected based on the characteristics of the vehicle to be inspected and the characteristics of the road surface, it is possible to accurately determine the abnormal noise of the vehicle by a simple setting operation by the user.

  (B) The characteristic of the vehicle is the vehicle size, and the correction unit corrects the basic evaluation line so that the sound pressure level of the evaluation line after correction increases as the vehicle size decreases. Therefore, even when the vehicle type of the vehicle to be inspected is changed, the basic evaluation line is corrected by setting the vehicle size by the user, and abnormal noise can be accurately determined.

  (C) The road surface characteristic is road surface unevenness, and the correction unit corrects the basic evaluation line so that the sound pressure level of the evaluation line after correction increases as the road surface unevenness increases. Therefore, even when the road surface on which the vehicle to be inspected travels is changed, the basic evaluation line is corrected by the setting of the road surface by the user, and abnormal noise can be accurately determined.

  (D) The abnormal sound determination apparatus according to the present embodiment further includes a calculation unit that calculates a basic evaluation line based on sound data of a plurality of vehicles determined to have good abnormal sound determination results. Therefore, since the basic evaluation line is set with high accuracy, it is possible to determine abnormal noise more accurately.

  (E) The input unit accepts a user setting about the ambient temperature of the vehicle, and the correction unit has a basic evaluation line so that the lower the ambient temperature of the vehicle, the higher the sound pressure level of the corrected evaluation line. Correct. Therefore, the erroneous determination factor due to the ambient temperature of the vehicle is removed, so that abnormal noise can be determined more accurately.

  (F) The input unit accepts a user setting for the atmospheric pressure around the vehicle, and the correction unit corrects the basic evaluation line so that the higher the atmospheric pressure, the higher the sound pressure level of the corrected evaluation line. . Therefore, since the erroneous determination factor caused by the atmospheric pressure around the vehicle is removed, it is possible to determine abnormal noise more accurately.

  (G) The abnormal sound determination device of the present embodiment further includes a dividing unit that divides sound data at predetermined time intervals to generate a plurality of time-division sound data. Therefore, since the abnormal noise generated suddenly is reliably detected, the abnormal noise can be determined more accurately.

  (H) The abnormal sound determination device of the present embodiment includes an extraction unit that extracts predetermined sound information from sound data, a sound quality determination unit that determines whether the sound quality of the vehicle is good based on the extracted sound information, It has further. Therefore, in addition to the determination of the abnormal sound included in the sound generated by the vehicle, the sound quality of the sound generated by the vehicle can be determined.

  (I) The abnormal sound determination method of the present embodiment includes a reception stage, a correction stage, a sound collection stage, an analysis stage, and a determination stage. In the reception stage, settings by the user regarding the characteristics of the vehicle to be inspected and the characteristics of the road surface on which the vehicle runs are received. The correction stage corrects the basic evaluation line for determining the abnormal noise included in the sound generated by the vehicle based on the received characteristics. In the sound collection stage, sound data is collected by collecting sound generated from the vehicle. In the analysis stage, the acquired sound data is subjected to frequency analysis, and a sound pressure level in a predetermined frequency region is calculated. In the determination step, the abnormal sound is determined by comparing the calculated sound pressure level with the corrected evaluation line. Therefore, since the basic evaluation line is corrected based on the characteristics of the vehicle to be inspected and the characteristics of the road surface, it is possible to accurately determine the abnormal noise of the vehicle by a simple setting operation by the user.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment is an embodiment using two microphones.

  FIG. 9 is a block diagram for illustrating a schematic configuration of the abnormal sound determination device according to the second embodiment of the present invention.

  As shown in FIG. 9, the abnormal sound determination device 100 according to the present embodiment includes a first microphone 110 a, a second microphone 110 b, and a device main body 120. The configuration of the abnormal sound determination device of the present embodiment is the same as that of the first embodiment, except that the abnormal sound determination device 100 of the present embodiment includes the second microphone 110b. Since it is the same, detailed description is abbreviate | omitted.

  The second microphone 110b is installed outside the inspection target vehicle 200 and collects sound outside the vehicle 200. The second microphone 110b collects sounds outside the vehicle 200 as outside vehicle sound collecting means, and acquires outside vehicle sound data. In addition, the calculation unit 124 functions as a removal unit that removes characteristic sounds included in the sound data outside the vehicle from the sound data. According to such a configuration, since the abnormal sound of the vehicle is determined from the sound data from which the characteristic sound that is the noise component is removed, the abnormal sound can be determined more accurately.

  As described above, the present embodiment described has the following effects in addition to the effects of the first embodiment.

  (J) The abnormal sound determination device according to the present embodiment collects sounds outside the vehicle and acquires outside sound data, and the characteristic sounds included in the outside sound data are converted into sound data. And a removing section for removing from. Therefore, since the noise component contained in the sound data is removed, it is possible to determine the abnormal sound more accurately.

  As described above, the abnormal sound determination device and the abnormal sound determination method of the present invention have been described in the first and second embodiments described above. However, it goes without saying that the present invention can be appropriately added, modified, and omitted by those skilled in the art within the scope of the technical idea.

  For example, in the first and second embodiments, the vehicle size is adopted as the vehicle characteristic, and the first correction value is set according to the vehicle size. However, the characteristics of the vehicle are not limited to the vehicle size. For example, the first correction value may be set according to the high-class feeling of the vehicle.

  In the first and second embodiments, the basic evaluation line is corrected based on both the vehicle characteristics and the road surface characteristics. However, the basic evaluation line may be corrected based on one of the characteristics of the vehicle and the characteristics of the road surface. For example, when the basic evaluation line is corrected based only on the characteristics of the vehicle, a plurality of basic evaluation lines corresponding to the characteristics of the road surface are stored in advance in the storage unit. Select one basic evaluation line according to the road surface characteristics. Then, the first correction value is determined according to the setting of the vehicle characteristics by the user, and the selected basic evaluation line is corrected by the determined first correction value.

  In the first and second embodiments, the number of abnormal sounds is counted in the entire predetermined frequency region obtained by FFT analysis. However, the predetermined frequency region may be divided into a plurality of frequency bands, and the quality of abnormal noise may be determined for each frequency band.

It is a figure which shows the external appearance of the abnormal sound determination apparatus in the 1st Embodiment of this invention. It is a block diagram which shows schematic structure of the abnormal sound determination apparatus shown in FIG. It is a flowchart for demonstrating the noise determination method in the noise determination apparatus shown in FIG. It is a flowchart for demonstrating the evaluation line correction | amendment process shown to step S102 of FIG. It is a figure for demonstrating the process which correct | amends a basic evaluation line. It is a flowchart for demonstrating the abnormal sound determination process shown to FIG.3 S104. It is a figure for demonstrating the process which compares the sound pressure level of the sound pressure data by which the frequency analysis was performed, and a basic evaluation line. It is a flowchart for demonstrating the sound quality determination process shown to step S105 of FIG. It is a block diagram for demonstrating schematic structure of the abnormal sound determination apparatus in the 2nd Embodiment of this invention.

Explanation of symbols

100 abnormal noise determination device,
110, 110a, 110b microphones (sound collecting means, vehicle sound collecting means),
111 signal lines,
120 device body,
121 input unit (accepting means, temperature setting accepting means, atmospheric pressure setting accepting means),
122 output section,
123 storage unit (storage means),
124 arithmetic unit (correction means, analysis means, determination means, calculation means, division means, extraction means, sound quality determination means, removal means),
200 vehicles.

Claims (10)

Storage means for storing a determination value for determining an abnormal sound included in the sound generated in the vehicle to be inspected;
An accepting means for accepting a setting by a user for at least one of the characteristics of the vehicle and the characteristics of the road surface on which the vehicle travels;
Correction means for correcting the determination value stored in the storage means based on the accepted characteristics;
Sound collecting means for collecting sound generated from the vehicle and obtaining sound data;
Analyzing means for performing frequency analysis on the acquired sound data and calculating a sound pressure level in a predetermined frequency region;
An abnormal sound determination apparatus comprising: a determination unit configured to determine the abnormal sound by comparing the calculated sound pressure level with the corrected determination value. The characteristic of the vehicle is the size of the vehicle,
The abnormal sound determination device according to claim 1, wherein the correction unit corrects the determination value so that a sound pressure level of the determination value after the correction increases as the size of the vehicle decreases. . The characteristic of the road surface is unevenness of the road surface,
3. The abnormal sound determination according to claim 1, wherein the correction unit corrects the determination value such that a sound pressure level of the determination value after the correction increases as the unevenness of the road surface increases. apparatus. Further comprising a calculation means for calculating the determination value based on the sound data of the plurality of vehicles determined to have good determination results of the abnormal noise;
The abnormal sound determination apparatus according to claim 1, wherein the storage unit stores the determination value calculated by the calculation unit. A temperature setting receiving means for receiving a setting by a user about the temperature around the vehicle;
The abnormal sound determination apparatus according to claim 1, wherein the correction unit corrects the determination value so that a sound pressure level of the determination value after the correction increases as the temperature decreases. Further comprising atmospheric pressure setting accepting means for accepting a setting by the user about the atmospheric pressure around the vehicle;
The abnormal sound determination apparatus according to claim 1, wherein the correction unit corrects the determination value so that a sound pressure level of the determination value after the correction increases as the atmospheric pressure increases. Further comprising a dividing means for dividing the sound data at a predetermined time interval to generate a plurality of divided data;
The analysis means calculates the sound pressure level by performing frequency analysis on the divided data,
The abnormal sound determination device according to claim 1, wherein the determination unit determines the abnormal sound at every predetermined time interval. Extraction means for extracting predetermined sound information from the sound data;
The abnormal sound determination device according to claim 1, further comprising sound quality determination means for determining quality of the sound based on the extracted sound information. Vehicle outside sound collection means for collecting outside sound of the vehicle and obtaining vehicle outside sound data;
Removing means for removing characteristic sounds included in the sound data outside the vehicle from the sound data;
The abnormal sound determination apparatus according to claim 1, wherein the determination unit determines the abnormal sound from the sound data from which the characteristic sound has been removed. Receiving a setting by the user for at least one of the characteristics of the vehicle to be inspected and the characteristics of the road surface on which the vehicle travels;
Correcting a determination value for determining an abnormal sound included in the sound generated in the vehicle based on the received characteristic;
Collecting sound generated from the vehicle to obtain sound data;
Analyzing the frequency of the acquired sound data to calculate a sound pressure level in a predetermined frequency region;
Comparing the calculated sound pressure level with the corrected determination value, and determining the abnormal noise.

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