Audio analysis device

Abstract

To provide an acoustic analysis device that can accurately identify an occurrence cause of noise.SOLUTION: An acoustic analysis device for analyzing noise occurring from a vehicle-mounted component mounted in a vehicle comprises an identification unit 130 that identifies a vehicle-mounted component to be an occurrence cause of noise on the basis of a gear ratio on right / left sides of the electric vehicle under a condition that, when a vehicle type of the vehicle is an electric vehicle having a plurality of motors provided in each wheel and individually transmitting driving force to each wheel via gears, a magnitude of the noise occurring from the vehicle-mounted component varies accompanied by a change in steering angle when the electric vehicle travels, and a frequency of the noise matches a difference between revolutions per minute of motors on the right / left sides of the electric vehicle.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an acoustic analysis device. [Background technology]

[0002] Conventionally, there is a widely known technology for identifying the cause of abnormal noise by analyzing the abnormal noise generated from an on-board component mounted on a vehicle. For example, in a device described in Patent Document 1, when an abnormal noise is generated from a rotating body, data on the abnormal noise is taken in, an order, which is a variable independent of the rotation speed of the rotating body, is calculated, and the calculated order is analyzed to identify the rotating body that is the source of the abnormal noise. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-98984 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional techniques still have room for improvement in terms of accurately identifying the cause of abnormal noise.

[0005] The present invention has been made in view of the above circumstances, and has as its object to provide an acoustic analysis device that can accurately identify the cause of abnormal noise. [Means for solving the problem]

[0006] The acoustic analysis device that solves the above problem is an acoustic analysis device that analyzes abnormal noises generated by on-board components mounted on a vehicle, and when the vehicle model is an electric vehicle having multiple motors that are provided on each wheel and transmit driving force to each wheel individually via gears, the acoustic analysis device includes an identification unit that identifies the on-board component that is causing the abnormal noise based on the gear ratio of the gears on both the left and right sides of the electric vehicle, on the condition that the order of the abnormal noise generated from the on-board components changes as the steering angle changes while the electric vehicle is running, and the frequency of the abnormal noise matches the difference in rotation speed between the motors on both the left and right sides of the electric vehicle. [Effects of the Invention]

[0007] According to the present invention, the cause of the abnormal noise can be accurately identified. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram showing an example of a schematic configuration of a vehicle on which an acoustic analysis device according to an embodiment of the present invention is mounted [Figure 2] 1 is a block diagram showing an example of a functional configuration of an acoustic analysis device according to an embodiment of the present invention; [Figure 3] 10 is a flowchart illustrating an example of processing content of an acoustic analysis process. DETAILED DESCRIPTION OF THE INVENTION

[0009] As shown in FIG. 1, a vehicle 10 equipped with the acoustic analysis device of this embodiment is an electric vehicle having a motor 12 corresponding to each wheel. The motor 12 may be provided outside each wheel and connected to the output shaft of the wheel via a gear, or may be an in-wheel motor using a gear reduction system. The motor 12 is provided for each wheel 11 and transmits driving force to each wheel 11 individually via gears 13. The control device 20 of the vehicle 10 includes, for example, a motor control ECU 21 that controls the operation of the motor 12, a transmission control ECU 22 that controls the operation of the transmission that transmits driving force from the motor 12 to the wheels 11, including control of the gear ratio of the gear 13, and a steering control ECU 23 that controls the steering operation.

[0010] 2, the acoustic analysis device 100 is realized by, for example, a hardware processor such as a CPU (Central Processing Unit) executing a program (software). Furthermore, some or all of these components may be realized by hardware (including circuitry) such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a GPU (Graphics Processing Unit), or may be realized by a combination of software and hardware. The program may be stored in advance in a storage device such as a HDD or flash memory of the acoustic analysis device 100, or may be stored in a removable storage medium such as a DVD or CD-ROM, and installed in the HDD or flash memory of the acoustic analysis device 100 by inserting the storage medium into a drive.

[0011] The acoustic analysis device 100 includes, for example, an acoustic acquisition unit 110, an acoustic analysis unit 120, and an identification unit .

[0012] The sound acquisition unit 110 acquires information about the sound generated from the transmission through a sound collection microphone 24 provided in the vehicle 10 .

[0013] The acoustic analysis unit 120 analyzes information about the sound acquired by the sound acquisition unit 110. For example, the acoustic analysis unit 120 analyzes the information about the sound to determine whether the sound contains an abnormal sound. If the acoustic analysis unit 120 determines that the sound contains an abnormal sound, it calculates the order of the abnormal sound by analyzing the recorded data of the abnormal sound. The order of the abnormal sound is a value unique to each gear 13 of the transmission, determined by the number of teeth of each gear 13. Furthermore, the acoustic analysis unit 120 calculates one or more peak frequencies contained in the abnormal sound as the frequency of the abnormal sound, for example, by performing frequency analysis on the recorded data of the abnormal sound.

[0014] The identification unit 130 acquires, for example, information regarding the rotation speeds of the motors 12 on both the left and right sides of the vehicle 10 from the motor control ECU 21. The identification unit 130 also acquires, for example, information regarding the steering angle of the steering of the vehicle 10 from the steering control ECU 23. The identification unit 130 also acquires, for example, information regarding the vehicle speed of the vehicle 10 and information regarding the gear ratios of the gears 13 on both the left and right sides of the vehicle 10 from the transmission control ECU 22. If the steering angle of the vehicle 10 is not "zero," the order of the abnormal sound calculated by the acoustic analysis unit 120 changes as the steering angle of the vehicle 10 changes, and the frequency of the abnormal sound calculated by the acoustic analysis unit 120 matches the difference in rotation speeds of the motors 12 on both the left and right sides of the vehicle 10, by comparing the gear ratios of the gears 13 on both the left and right sides of the vehicle 10 with the frequency of the abnormal sound, the identification unit 130 identifies the transmission part causing the abnormal sound. The identifying unit 130 then outputs information about the transmission part identified as the cause of the abnormal noise to the output device 30. Furthermore, prior to identifying the transmission part causing the abnormal noise, the identifying unit 130 acquires information about the abnormal noise occurrence situation, the vehicle driving situation, onomatopoeia describing the abnormal noise, the condition of the road surface on which the vehicle is traveling when the abnormal noise occurs, etc. as responses to questions from the driver of the vehicle 10, and narrows down the abnormal noises based on the acquired information. Furthermore, after identifying the transmission part causing the abnormal noise, the identifying unit 130 inputs information about the sound generated from the transmission acquired via the sound collecting microphone 24 provided on the vehicle 10 into a determination model trained using learning data that associates a combination of abnormal noise data and vehicle data (such as vehicle speed) with the transmission part causing the abnormal noise, and identifies the transmission part causing the abnormal noise. The identifying unit 130 then outputs to the output device 30 information about the abnormal noise narrowed down as described above, and information about the transmission parts that are determined to be the cause of the abnormal noise using the determination model described above.

[0015] Next, the acoustic analysis process executed by the acoustic analysis device 100 of this embodiment will be described with reference to the flowchart shown in Fig. 3. The flowchart shown in Fig. 3 is executed, for example, when it is determined that information related to the sound acquired through the sound collection microphone 24 includes an abnormal sound.

[0016] The acoustic analysis device 100 first identifies the vehicle type based on the vehicle identification number (VIN) of the vehicle 10 (step S10). In this embodiment, the acoustic analysis device 100 identifies that the vehicle type of the vehicle 10 is an electric vehicle having multiple motors 12 provided on each wheel 11 and transmitting driving force to each wheel 11 individually via gears 13.

[0017] Next, the acoustic analysis device 100 acquires information about the number of times of the left and right motors 12 and information about the steering angle of the steering of the vehicle 10 (step S11).

[0018] Next, the acoustic analysis device 100 determines whether the steering angle of the vehicle 10 is "zero" when the abnormal noise occurs (step S12).

[0019] If the acoustic analysis device 100 determines in the previous step S12 that the steering angle of the vehicle 10 is not "zero" when the abnormal noise occurs (step S12=NO), it determines whether the order of the abnormal noise has changed with a change in the steering angle of the vehicle 10 (step S13).

[0020] If the acoustic analysis device 100 determines in the previous step S13 that the order of the abnormal noise has changed with a change in the steering angle of the vehicle 10 (step S13=YES), it calculates the speed difference between the left and right wheels 11 of the vehicle 10 based on information about the vehicle speed of the vehicle 10 and information about the steering angle of the vehicle 10 (step S14).

[0021] Next, the acoustic analysis device 100 calculates the frequency of the abnormal noise by performing frequency analysis on the recorded data of the abnormal noise (step S15).

[0022] Next, the acoustic analysis device 100 determines whether the frequency of the abnormal noise calculated in the previous step S15 matches the difference in rotation speed between the motors 12 on the left and right sides of the vehicle 10 (step S16).

[0023] If the acoustic analysis device 100 determines that the frequency of the abnormal noise matches the difference in rotation speed between the motors 12 on both the left and right sides of the vehicle 10 (step S16=YES), it compares the gear ratio of each gear 13 with the frequency of the abnormal noise (step S17), thereby identifying the transmission part that is causing the abnormal noise (step S18), and then ends the flowchart shown in FIG. 3.

[0024] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. The present invention may be modified or improved without departing from its spirit, and equivalents are also included within the scope of the present invention. In other words, designs modified by those skilled in the art as appropriate are also encompassed within the scope of the present invention as long as they incorporate the characteristics of the present invention. For example, the elements of the present embodiments, as well as their arrangement, materials, conditions, shapes, sizes, etc., are not limited to those illustrated and can be modified as appropriate. Furthermore, the embodiments are merely examples, and partial substitution or combination of the configurations shown in different embodiments is possible. These are also encompassed within the scope of the present invention as long as they incorporate the characteristics of the present invention. [Explanation of symbols]

[0025] 10...vehicle, 11...wheel, 12...motor, 13...gear, 20...control device, 21...motor control ECU, 22...transmission control ECU, 23...steering control ECU, 30...output device, 100...acoustic analysis device, 110...acoustic acquisition unit, 120...acoustic analysis unit, 130...identification unit

Claims

[Claim 1] An acoustic analysis device that analyzes abnormal noise generated from an on-board component mounted on a vehicle, and when the vehicle type is an electric vehicle having a plurality of motors provided on each wheel and transmitting driving force to each wheel individually via gears, the vehicle includes an identifying unit that identifies the on-board component that is causing the abnormal noise based on the gear ratio of the gears on both the left and right sides of the electric vehicle, on the condition that the order of the abnormal noise generated from the on-board component changes with a change in the steering angle while the electric vehicle is running, and the frequency of the abnormal noise matches the difference in rotation speed between the motors on both the left and right sides of the electric vehicle. Acoustic analysis equipment.

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