JP2010243338A - Abnormal noise determining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abnormal noise determining device capable of improving determination accuracy by determining the presence or absence of abnormal noise generation, while checking driving conditions, such as, the speed of a vehicle. <P>SOLUTION: The abnormal noise determining device 10 includes an in-vehicle sound meter 20 for collecting sounds in the vehicle 1; a driving state determining unit 44 for determining whether the vehicle is driven according to predetermined driving conditions; and an abnormal noise generation determining unit 53 for determining whether the abnormal noise is generated, based on the in-vehicle sound data measured by the in-vehicle sound meter, while the driving conditions are maintained by the driving state determination unit. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an abnormal sound determination device. Specifically, the present invention relates to an apparatus that determines whether or not a sound generated by traveling of a vehicle is abnormal.

  Conventionally, an abnormal sound determination device has been used in an inspection process for a completed vehicle in an automobile factory. For example, a vehicle that generates abnormal noise when traveling on an inspection course such as a stone pavement is regarded as a defective product, thereby preventing the vehicle from entering the market.

  Such an abnormal sound determination device has conventionally existed (see, for example, Patent Document 1). Patent Document 1 discloses a device that divides sound collection data collected when a vehicle is driven into a plurality of frequency bands and determines that the sound is abnormal when the sound pressure in an arbitrary frequency band exceeds a predetermined threshold. Is disclosed.

JP-A-4-221740

  However, the sound generated by the traveling of the vehicle varies greatly depending on traveling conditions such as speed. Therefore, even if the running speed is set for the inspection, if the vehicle is run at a speed slower than the set speed, the predetermined sound pressure is set even if abnormal noise actually occurs. The threshold may not be exceeded. In that case, since it is determined that no abnormal noise is generated, there is a problem that reliability of the determination is lacking.

  Further, if the vehicle is driven at a speed higher than the set speed, a sound exceeding a predetermined threshold of sound pressure may be generated even if no abnormal noise is actually generated. In that case, since it is determined that abnormal noise has occurred, there is a problem that the determination is not reliable.

  The present invention has been made in view of the above-described problem, and an abnormal noise determination that can improve the accuracy of determination by determining whether or not an abnormal noise has occurred while checking a traveling condition such as a vehicle speed. An object is to provide an apparatus.

  An abnormal sound determination device (for example, an after-mentioned abnormal sound determination device 10) of the present invention is an in-vehicle sound measuring unit (for example, an in-vehicle sound measuring device 20 described later) that collects sound in a vehicle (for example, a vehicle 1 described later). The traveling condition is maintained by a traveling condition determining unit (for example, a traveling condition determining unit 44 described later) that determines whether or not the vehicle is traveling under a predetermined traveling condition, and the traveling condition determining unit. An abnormal sound generation determination unit (for example, an abnormal sound generation determination unit 53 described later) for determining whether or not an abnormal sound has occurred based on the vehicle interior sound data measured by the vehicle interior sound measurement unit, It is characterized by providing.

  According to this invention, the presence or absence of abnormal noise is determined by the traveling state determination unit while confirming that the traveling condition of the vehicle is maintained. Therefore, the accuracy of determination can be improved.

  In this case, it is preferable that the traveling condition has a plurality of different ranges determined in advance, and the determination condition by the abnormal sound generation determination unit varies according to each range.

  According to the present invention, the abnormal sound determination threshold by the abnormal sound generation determination unit also varies in accordance with changes in the vehicle running conditions. Therefore, the accuracy of determination can be improved.

  In this case, the abnormal sound occurrence determination unit uses a data obtained by averaging vehicle interior sound data measured by the vehicle interior sound measurement unit at predetermined time intervals, and an average value exceeding a predetermined threshold value is predetermined. It is preferable to determine that an abnormal sound has occurred when the number of times has been reached.

  According to this invention, when the number of times that the average value of the sound pressure data during a short time interval exceeds the threshold value reaches a predetermined number, it is determined that an abnormal sound has occurred. Therefore, when a short intermittent sound is generated many times, it can be reliably determined as an abnormal sound. Therefore, the accuracy of determination can be improved.

  In this case, an environmental sound measuring unit (for example, an environmental sound measuring device 30 described later) that collects sound outside the vehicle of the vehicle is further provided, and an environment that exceeds a predetermined threshold and is shorter than a predetermined time by the environmental sound measuring unit. When sound data is measured, the abnormal sound generation determination unit deletes the vehicle interior sound data measured by the vehicle interior sound measurement unit at the generation timing of the environment sound data, or the environment sound from the vehicle interior sound data. It is preferable to determine whether abnormal noise has occurred using data obtained by subtracting the data.

  According to this invention, the abnormal sound occurrence determination unit deletes the in-vehicle sound data measured at the occurrence timing of the sudden environmental sound data, or uses data obtained by subtracting the sudden environmental sound data from the in-vehicle sound data. Then, it is determined whether or not an abnormal noise has occurred. Therefore, the accuracy of determination can be improved.

  According to the present invention, the presence or absence of abnormal noise is determined by confirming that the traveling condition of the vehicle is maintained by the traveling state determination unit. Therefore, the accuracy of determination can be improved.

1 is a schematic plan view of a vehicle to which an abnormal sound determination device according to an embodiment of the present invention is applied. It is a block diagram which shows the noise determination apparatus shown in FIG. It is a flowchart which shows 1st Embodiment of operation | movement by the control apparatus shown in FIG. It is a graph which shows the relationship between the frequency and sound pressure in the case of embodiment shown in FIG. It is a flowchart which shows 2nd Embodiment of operation | movement by the control apparatus shown in FIG. It is a graph which shows the relationship between the frequency and sound pressure in the case of embodiment shown in FIG. It is a graph which shows the relationship between the speed and threshold value in the case of embodiment shown in FIG. It is a flowchart which shows 3rd Embodiment of operation | movement by the control apparatus shown in FIG. It is a flowchart which shows 4th Embodiment of operation | movement by the control apparatus shown in FIG. It is a flowchart which shows 5th Embodiment of operation | movement by the control apparatus shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic plan view of a vehicle 1 to which an abnormal sound determination device 10 according to the present embodiment is applied, and FIG. 2 is a block diagram showing the abnormal sound determination device 10. The abnormal noise determination device 10 determines whether or not an abnormal noise is generated when the vehicle 1 travels on an inspection course such as a stone pave shown in FIG.

  As shown in FIGS. 1 and 2, the abnormal sound determination device 10 includes an in-vehicle sound measuring device 20 as an in-vehicle sound measuring unit arranged in the vehicle 1 and an environmental sound measuring unit arranged outside the vehicle 1. As an environmental sound measuring device 30, a control device 40, and an output device 60.

  The vehicle interior sound measuring device 20 includes a front sound collector 21a, a rear sound collector 21b, a vehicle interior sound data processing unit 22, and an output unit 23. The front sound collector 21a is disposed in the front portion of the vehicle 1 and collects the front interior sound. The rear sound collector 21b is disposed at the rear portion of the vehicle 1 and collects rear vehicle interior sound. The vehicle interior sound data processing unit 22 performs data processing on the front vehicle interior sound collected by the front sound collector 21a and the rear vehicle interior sound collected by the rear sound collector 21b by a predetermined method. . The output unit 23 outputs the vehicle interior sound data processed by the vehicle interior sound data processing unit 22 to the control device 40.

  The environmental sound measuring device 30 includes a first sound collector 31a to an nth sound collector 31n, an environmental sound data processing unit 32, and an output unit 33. The first sound collector 31a to the nth sound collector 31n are arranged at predetermined intervals on both sides of the travel path of the vehicle 1 and collect environmental sounds on the travel path. The environmental sound data processing unit 32 processes the environmental sound collected by the first sound collector 31a to the nth sound collector 31n by a predetermined method. The output unit 33 outputs the environmental sound data processed by the environmental sound data processing unit 32 to the control device 40.

  The control device 40 includes a speed setting unit 41, a speed control unit 42, a speed data storage unit 43, a traveling state determination unit 44, a threshold database 50, an in-vehicle sound data storage unit 51, and an in-vehicle sound data processing unit 52. And an abnormal sound occurrence determination unit 53 and an environmental sound data storage unit 54.

  The speed setting unit 41 sets a traveling speed as an example of a traveling condition of the vehicle 1. The speed control unit 42 controls the drive system 2 of the vehicle 1 so that the vehicle 1 travels at the speed set by the speed setting unit 41. The speed data storage unit 43 stores, that is, stores the speed data of the vehicle 1 transmitted from the drive system 2. The traveling state determination unit 44 determines whether or not the vehicle 1 is traveling under a predetermined traveling condition, that is, a traveling speed, based on the speed data of the vehicle 1 stored in the speed data storage unit 43.

  In the threshold value database 50, various threshold values are stored, that is, stored according to the traveling conditions of the vehicle 1. For example, when the traveling speed of the vehicle 1 is relatively low, the abnormal sound determination threshold used by the abnormal sound generation determination unit 53 to determine whether or not abnormal noise has occurred is relatively small. On the other hand, when the traveling speed of the vehicle 1 is relatively high, the abnormal sound determination threshold used by the abnormal sound generation determination unit 53 is relatively large. Thus, there is a correlation between the abnormal sound determination threshold used by the abnormal sound occurrence determination unit 53 and the traveling speed of the vehicle 1. Therefore, what kind of abnormal noise is generated by actually running the vehicle 1 on an inspection course such as a stone pavement or a rough road is tested. Based on the result, the threshold database 50 is a database of the relationship between the traveling speed of the vehicle 1 and the abnormal sound determination threshold used by the abnormal sound generation determination unit 53.

  The vehicle interior sound data storage unit 51 stores, that is, stores vehicle interior sound data of the vehicle 1 transmitted from the output unit 23 of the vehicle interior sound measuring instrument 20. The vehicle interior sound data processing unit 52 processes vehicle interior sound data of the vehicle 1 stored in the vehicle interior sound data storage unit 51.

  That is, the vehicle interior sound data processing unit 52 divides the vehicle interior sound data of the vehicle 1 into a plurality of frequency blocks (bands), for example. Further, for example, the in-vehicle sound data of the vehicle 1 is averaged at predetermined time intervals. Further, as described later, for example, when a sudden environmental sound is generated, the vehicle interior sound data at the timing when the sudden environmental sound is generated is deleted, or the sudden environmental sound is subtracted from the vehicle sound data. A sudden environmental sound is an environmental sound that exceeds a predetermined threshold and is shorter than a predetermined time.

  The abnormal noise generation determination unit 53 generates an abnormal noise based on the vehicle interior sound data measured by the vehicle interior sound measuring instrument 20 in a state where the traveling condition determination unit 44 confirms that the traveling condition is maintained. It is determined whether or not. That is, the abnormal sound occurrence determination unit 53 acquires a corresponding threshold value from the threshold value database 50 according to the traveling condition confirmed by the traveling state determination unit 44. This threshold value is compared with the in-vehicle sound data of the vehicle 1 to determine whether or not abnormal noise has occurred.

  The environmental sound data storage unit 54 stores, that is, stores the environmental sound data of the vehicle 1 transmitted from the output unit 33 of the environmental sound measuring instrument 30. For this reason, the sudden environmental sound data described above is also stored in the environmental sound data storage unit 54. When a sudden environmental sound is generated, the abnormal sound generation determination unit 53 deletes the vehicle interior sound data measured by the vehicle interior sound measuring device 20 at the generation timing of the sudden environmental sound data by the vehicle interior sound data processing unit 52, Alternatively, it is determined whether abnormal noise has occurred using data obtained by subtracting sudden environmental sound data from the in-vehicle sound data.

  The output device 60 outputs the result determined by the abnormal sound occurrence determination unit 53. For example, the determination result of abnormal noise occurrence by the abnormal noise occurrence determination unit 53 or the determination result of no abnormal noise generation is displayed on an appropriate display screen.

Next, a first embodiment of the operation by the control device 40 will be described with reference to the flowchart shown in FIG.
First, in step S1, the control device 40 causes the vehicle 1 to travel under predetermined traveling conditions. That is, the speed control unit 42 controls the drive system 2 of the vehicle 1 so that the vehicle 1 travels at the speed set by the speed setting unit 41. Specifically, the vehicle 1 is made to travel at a speed of 10 km / hour, for example.

  In step S2, the sound collectors 21a and 21b are operated. Vehicle interior sound data obtained by processing the front vehicle interior sound collected by operating the front sound collector 21a of the vehicle interior sound measuring instrument 20 and the rear vehicle interior sound collected by operating the rear sound collector 21b. Is output to the control device 40.

In step S3, the control device 40 determines whether or not the traveling speed of the vehicle 1 is between a predetermined lower limit value and an upper limit value. Specifically, when the vehicle 1 is traveling at a speed of 10 km / h, the lower limit value is, for example, 8 km / h, and the upper limit value is, for example, 12 km / h.
If this determination is YES, the process proceeds to step S4, and if NO, the process proceeds to step S12.

  In step S4, the control device 40 divides the sound pressure data into a plurality of frequency blocks. That is, the in-vehicle sound data obtained from the in-vehicle sound measuring instrument 20 is represented by a graph in which the horizontal axis represents frequency and the vertical axis represents sound pressure (amplitude) as shown in FIG. In this graph, the frequency is divided into a plurality of blocks (bands). Specifically, it is divided into four blocks A to D.

In step S5, the control device 40 compares the sound pressure data with a threshold value for each frequency block. That is, as shown in FIG. 4, the sound pressure data of the A block is compared with a threshold value T _A of the A block. The sound pressure data of the B block is compared with a threshold value T _B of the B block. The sound pressure data of the C block is compared with a threshold value T _C of the C block. The sound pressure data of the D blocks is compared with a threshold value T _D of the D blocks. These threshold values T _A , T _B , T _C , and T _D are stored in the threshold value database 50.

In step S6, the control device 40 determines whether or not the sound pressure data exceeds a threshold value even in one block. Specifically, in the case of the graph G1 shown in FIG. 4, the sound pressure data is lower than the threshold values T _A , T _B , T _C , and T _D in all the blocks _A , _B , _C , and _D , respectively. On the other hand, if the graph G2, the sound pressure data of the A blocks is above a threshold value T _A of the A block. The sound pressure data of the remaining three blocks _B , _C , and _D are below the threshold values T _B , T _C , and T _D , respectively.
If this determination is YES, the process proceeds to step S7, and if NO, the process proceeds to step S8.

  In step S <b> 7, the control device 40 determines that abnormal noise has occurred. Specifically, in the case of the graph G2 shown in FIG.

On the other hand, when the determination in step S6 is NO and the process proceeds to step S8, in step S8, the control device 40 determines whether or not the inspection time has ended. That is, the inspection time is determined in advance, and it is determined whether this inspection time is halfway or completed.
If this determination is YES, the process proceeds to step S9, and if NO, the process proceeds to step S10.

  In step S9, the control device 40 determines that no abnormal noise has occurred. Specifically, in the case of the graph G1 shown in FIG.

On the other hand, when the determination in step S8 is NO and the process proceeds to step S10, in step S10, the control device 40 determines whether or not the traveling speed of the vehicle 1 is between a predetermined lower limit value and an upper limit value. Specifically, it is determined whether or not the vehicle 1 is traveling at a speed between 8 km / h as the lower limit and 12 km / h as the upper limit.
If this determination is YES, the process returns to step S4, and if NO, the process proceeds to step S11.

  In step S <b> 11, the control device 40 determines that the inspection is to be restarted. In this case, the determination in step S3 is YES, and the determination in step S10 is NO. Specifically, in step S3, the vehicle 1 was traveling at a speed between the lower limit value of 8 km / h and the upper limit value of 12 km / h. However, in step S10, whether the traveling speed of the vehicle 1 is less than 8 km / h. Or more than 12km / h. That is, since the traveling speed of the vehicle 1 is out of the set range, it is determined that the inspection is to be repeated.

On the other hand, when the determination in step S3 is NO and the process proceeds to step S12, in step S12, the control device 40 determines whether or not the inspection time has ended. That is, it is determined whether the predetermined inspection time is in the middle or has ended.
If this determination is YES, the process moves to step S11, and if NO, the process returns to step S3.

  In step S <b> 11, the control device 40 determines that the inspection is to be restarted. In this case, since the traveling speed of the vehicle 1 has never entered the set range from the start to the end of the inspection time, it is determined that the inspection is to be repeated.

  In the case of the present embodiment, as will be described later in the embodiment shown in FIG. 8, it is possible to cancel the influence of the sudden environmental sound from the in-vehicle sound data as the sudden environmental sound is generated.

According to this embodiment, there are the following effects.
(1) The presence / absence of abnormal noise is determined while confirming that the traveling condition such as the speed of the vehicle 1 is maintained by the traveling state determination unit 44. Therefore, the accuracy of determination can be improved.

Next, a second embodiment of the operation by the control device 40 will be described with reference to the flowchart shown in FIG.
First, in step S21, the control device 40 causes the vehicle 1 to travel under predetermined traveling conditions. Specifically, the vehicle 1 is made to travel at an arbitrary speed of 5 km to 40 km per hour, for example.

  Step S22 is the same as step S2 in the flowchart shown in FIG.

In step S23, the control device 40 determines whether the traveling speed of the vehicle 1 is within a predetermined range, that is, whether the traveling speed is higher than the speed A and lower than the speed B. Specifically, it is determined whether or not the traveling speed of the vehicle 1 is in a range faster than 5 km / h and slower than 10 km / h, for example.
If this determination is YES, the process moves to step S24, and if NO, the process moves to step S30.

  In step S24, the control device 40 divides the sound pressure data into a plurality of frequency blocks. That is, in the graph Ga as shown in FIG. 6A representing the in-vehicle sound data obtained from the in-vehicle sound measuring instrument 20, the frequency is divided into a plurality of blocks (bands). Specifically, it is divided into four blocks A to D.

  In step S25, the control device 40 compares the sound pressure data with a threshold value for each frequency block. This will be described later.

In step S <b> 26, the control device 40 determines whether or not the sound pressure data exceeds a threshold value even for one block. This will be described later.
If this determination is YES, the process proceeds to step S27, and if NO, the process proceeds to step S28.

  Steps S27, S28, and S29 are the same as steps S7, S8, and S9 of the flowchart shown in FIG.

On the other hand, if the determination in step S23 is NO and the process proceeds to step S30, in step S30, the controller 40 determines whether or not the traveling speed of the vehicle 1 is within a predetermined range, that is, the speed C is higher than the speed B. Determine if it is in a slower range. Specifically, it is determined whether or not the traveling speed of the vehicle 1 is in a range higher than 10 km / h and lower than 20 km / h, for example.
If this determination is YES, the process moves to step S31, and if NO, the process moves to step S34.

  In step S31, the control device 40 divides the sound pressure data into a plurality of frequency blocks. That is, the frequency is divided into a plurality of blocks (bands) in a graph Gb as shown in FIG. 6B representing the in-vehicle sound data obtained from the in-vehicle sound measuring instrument 20. Specifically, it is divided into four blocks A to D.

  Steps S32 and S33 are the same as steps S25 and S26, respectively, and will be described later.

On the other hand, if the determination in step S30 is NO and the process proceeds to step S34, in step S34, the control device 40 determines whether or not the traveling speed of the vehicle 1 is within a predetermined range, that is, the speed D is higher than the speed C. Determine if it is in a slower range. Specifically, it is determined whether or not the traveling speed of the vehicle 1 is in a range higher than 20 km / h and lower than 40 km / h, for example.
If this determination is YES, the process proceeds to step S35, and if NO, the process proceeds to step S38.

  In step S35, the control device 40 divides the sound pressure data into a plurality of frequency blocks. That is, in the graph Gc as shown in FIG. 6C representing the in-vehicle sound data obtained from the in-vehicle sound measuring instrument 20, the frequency is divided into a plurality of blocks (bands). Specifically, it is divided into four blocks A to D.

  Steps S36 and S37 are the same as steps S25 and S26, respectively, and will be described later.

  Steps S38 and S39 are the same as steps S12 and S11 in the flowchart shown in FIG.

  As shown in FIG. 7, there is a correlation between the traveling speed of the vehicle 1 and the abnormal sound determination threshold used by the abnormal sound generation determination unit 53 to determine whether or not abnormal noise has occurred. Details of this correlation are obtained by experiment and the results are stored in the threshold value database 50.

  As described above, in step S25, the sound pressure data is compared with the threshold value for each of the frequency blocks A to D in the graph Ga as shown in FIG. Although not shown, the threshold value is different for each of the frequency blocks A to D. In this case, since the speed of the vehicle 1 is in the range of 5 km to 10 km / h, the abnormal sound determination threshold corresponding to this speed range is obtained from the threshold database 50, and this abnormal sound determination threshold is obtained for each frequency block A to D. Compare with sound pressure data. Then, it is determined whether or not the sound pressure data exceeds the abnormal sound determination threshold even in one block (see steps S25 and S26).

  In step S32, the sound pressure data is compared with a threshold value for each of the frequency blocks A to D in the graph Gb as shown in FIG. In this case, since the speed of the vehicle 1 is in the range of 10 km to 20 km per hour, the level of the sound pressure data is higher in all frequency blocks A to D than the graph Ga shown in FIG. An abnormal sound determination threshold value corresponding to this speed range is acquired from the threshold value database 50, and the abnormal sound determination threshold value is compared with sound pressure data for each of the frequency blocks A to D. Then, it is determined whether or not the sound pressure data exceeds the abnormal sound determination threshold even in one block (see steps S32 and S33).

  In step S36, the sound pressure data is compared with the threshold value for each of the frequency blocks A to D in the graph Gc as shown in FIG. In this case, since the speed of the vehicle 1 is in the range of 20 km to 40 km per hour, the level of the sound pressure data is higher in all frequency blocks A to D than the graph Gb shown in FIG. An abnormal sound determination threshold value corresponding to this speed range is acquired from the threshold value database 50, and the abnormal sound determination threshold value is compared with sound pressure data for each of the frequency blocks A to D. Then, it is determined whether or not the sound pressure data exceeds the abnormal sound determination threshold even in one block (see steps S36 and S37).

  In the case of the present embodiment, as will be described later in the embodiment shown in FIG. 9, it is possible to cancel the influence of the sudden environmental sound from the in-vehicle sound data as the sudden environmental sound is generated.

According to this embodiment, there are the following effects.
(2) As the traveling speed of the vehicle 1 fluctuates, the noise determination threshold by the noise generation determination unit 53 also varies. Therefore, the accuracy of determination can be improved.

Next, a third embodiment of the operation by the control device 40 will be described with reference to the flowchart shown in FIG.
Step S41 is the same as step S1 in the flowchart shown in FIG.

  In step S42, the sound collectors 21a and 21b and the sound collectors 31a to 31n are operated. In-vehicle sound obtained by processing the front in-vehicle sound collected by operating the front sound collector 21a of the in-vehicle sound measuring instrument 20 and the rear in-vehicle sound collected by operating the rear sound collector 21b The data and the environmental sound data obtained by processing the environmental sound collected by operating the first sound collector 31 a to the n-th sound collector 31 n of the environmental sound measuring device 30 are output to the control device 40.

  Step S43 is the same as step S3 in the flowchart shown in FIG.

In step S44, it is determined whether or not the sudden environmental sound is detected by the control device 40.
If this determination is YES, the process proceeds to step S45, and if NO, the process proceeds to step S46.

  In step S45, the control device 40 deletes the in-vehicle sound data at the detection timing of the sudden environmental sound, or subtracts the sudden environmental sound from the in-vehicle sound data. That is, when sudden environmental sound is measured by the environmental sound measuring device 30, the vehicle interior sound data processing unit 52 deletes the vehicle interior sound data measured by the vehicle interior sound measuring device 20 at the generation timing of the environmental sound data. Alternatively, the environmental sound data is subtracted from the in-vehicle sound data.

In step S46, the control device 40 determines whether or not the sound pressure data exceeds a threshold value. That is, the abnormal sound occurrence determination unit 53 deletes the in-vehicle sound data measured by the in-vehicle sound measuring device 20 at the generation timing of the sudden environmental sound data, or subtracts the sudden environmental sound data from the in-vehicle sound data. Is used to determine whether or not an abnormal noise has occurred.
If this determination is YES, the process proceeds to step S47, and if NO, the process proceeds to step S48.

  Steps S47, S48, S49, S50, S51, and S52 are the same as steps S7, S8, S9, S10, S11, and S12 of the flowchart shown in FIG.

According to this embodiment, there are the following effects.
(3) The abnormal sound occurrence determination unit 53 deletes the in-vehicle sound data measured by the in-vehicle sound measuring instrument 20 at the generation timing of the sudden environmental sound data, or subtracts the sudden environmental sound data from the in-vehicle sound data. It is determined whether abnormal noise has occurred using the data. Therefore, the accuracy of determination can be improved.

Next, a fourth embodiment of the operation by the control device 40 will be described with reference to the flowchart shown in FIG.
Steps S61, S62, and S63 are the same as steps S21, S22, and S23 of the flowchart shown in FIG.

  Steps S64 and S65 are the same as steps S44 and S45 in the flowchart shown in FIG.

In step S66, the control device 40 determines whether or not the sound pressure data exceeds a threshold value. That is, the abnormal sound occurrence determination unit 53 deletes the in-vehicle sound data measured by the in-vehicle sound measuring instrument 20 at the generation timing of the sudden environmental sound data, or subtracts the sudden environmental sound data from the in-vehicle sound data. Is used to determine whether or not an abnormal noise has occurred. In this case, since the speed of the vehicle 1 is in the range of 5 km to 10 km / h, the abnormal sound determination threshold corresponding to this speed range is acquired from the threshold database 50, and this abnormal sound determination threshold is compared with the sound pressure data.
If this determination is YES, the process proceeds to step S67, and if this determination is NO, the process proceeds to step S68.

  Steps S67, S68, S69, and S70 are the same as steps S27, S28, S29, and S30 of the flowchart shown in FIG.

  Steps S71 and S72 are the same as steps S64 and S65, respectively, and thus description thereof is omitted.

In step S73, the control device 40 determines whether or not the sound pressure data exceeds a threshold value. That is, the abnormal sound occurrence determination unit 53 deletes the in-vehicle sound data measured by the in-vehicle sound measuring device 20 at the generation timing of the sudden environmental sound data, or subtracts the sudden environmental sound data from the in-vehicle sound data. Is used to determine whether or not an abnormal noise has occurred. In this case, since the speed of the vehicle 1 is in the range of 10 km to 20 km / h, the abnormal sound determination threshold corresponding to this speed range is acquired from the threshold database 50, and this abnormal sound determination threshold is compared with the sound pressure data.
If this determination is YES, the process proceeds to step S67, and if this determination is NO, the process proceeds to step S68.

  Step S74 is the same as step S34 in the flowchart shown in FIG.

  Steps S75 and S76 are the same as steps S64 and S65, respectively, and a description thereof will be omitted.

In step S77, the control device 40 determines whether or not the sound pressure data exceeds a threshold value. That is, the abnormal sound occurrence determination unit 53 deletes the in-vehicle sound data measured by the in-vehicle sound measuring instrument 20 at the generation timing of the sudden environmental sound data, or subtracts the sudden environmental sound data from the in-vehicle sound data. Is used to determine whether or not an abnormal noise has occurred. In this case, since the speed of the vehicle 1 is in the range of 20 km / h to 40 km / h, an abnormal sound determination threshold value corresponding to this speed range is acquired from the threshold value database 50 and the abnormal sound determination threshold value is compared with the sound pressure data.
If this determination is YES, the process proceeds to step S67, and if this determination is NO, the process proceeds to step S68.

  Steps S78 and S79 are the same as steps S38 and S39 in the flowchart shown in FIG.

  According to the present embodiment, there are effects similar to the effects (2) and (3).

Next, a fifth embodiment of the operation by the control device 40 will be described with reference to the flowchart shown in FIG.
Steps S81, S82, and S83 are the same as steps S1, S2, and S3 of the flowchart shown in FIG.

In step S84, the control device 40 determines whether a long time interval has elapsed. A predetermined long time interval is set in advance. Specifically, for example, it is determined whether a time interval of 5 minutes has elapsed.
If this determination is YES, the process proceeds to step S85, and if NO, the process proceeds to step S90.

  In step S85, the control device 40 obtains an average value of the sound pressure data. Specifically, an average value of sound pressure data during a time interval of 5 minutes is obtained.

In step S86, the control device 40 determines whether or not the average value exceeds a threshold value.
If this determination is YES, the process proceeds to step S87, and if NO, the process proceeds to step S88.

  Steps S87, S88, and S89 are the same as steps S27, S28, and S29 in the flowchart shown in FIG.

On the other hand, when the determination in step S84 is NO and the process proceeds to step S90, in step S90, the control device 40 determines whether a short time interval has elapsed. A predetermined short time interval is set in advance. Specifically, for example, it is determined whether or not a time interval of 3 seconds has elapsed.
If this determination is YES, the process moves to step S91, and if NO, the process returns to step S83.

  Steps S91 and S92 are the same as steps S85 and S86, respectively, and a description thereof will be omitted.

In step S93, the control device 40 determines whether or not the number of times that the average value exceeds the threshold has reached the set number. Specifically, it is determined whether or not the number of times that the average value exceeds the threshold value has reached, for example, 10 times.
If this determination is YES, the process proceeds to step S94, and if NO, the process returns to step S90.

  Steps S94, S95, and S96 are the same as steps S87, S88, and S89, respectively, and thus description thereof is omitted.

  Steps S97 and S98 are the same as steps S38 and S39 in the flowchart shown in FIG.

According to this embodiment, there are the following effects.
(4) For example, when the number of times that the average value of sound pressure data during a short time interval of 3 seconds exceeds a threshold value reaches, for example, 10 times, it is determined that an abnormal sound has occurred. Therefore, when a short intermittent sound is generated many times, it can be reliably determined as an abnormal sound. Therefore, the accuracy of determination can be improved.

DESCRIPTION OF SYMBOLS 1 ... Vehicle 10 ... Abnormal sound determination apparatus 20 ... Car interior sound measuring device (car interior sound measuring part)
30 ... Ambient sound measuring instrument (environmental sound measuring unit)
DESCRIPTION OF SYMBOLS 40 ... Control apparatus 44 ... Running condition determination part 53 ... Abnormal sound generation determination part

Claims (4)

A vehicle interior sound measurement unit that collects sound within the vehicle,
A traveling state determination unit that determines whether or not the vehicle is traveling under predetermined traveling conditions;
An abnormal sound occurrence determination unit that determines whether or not an abnormal sound has occurred based on in-vehicle sound data measured by the in-vehicle sound measurement unit in a state where the traveling condition is maintained by the traveling state determination unit;
An abnormal sound determination device comprising: The abnormal sound determination device according to claim 1,
The driving condition has a plurality of different ranges determined in advance,
The abnormal sound determination device, wherein the determination condition by the abnormal sound generation determination unit varies according to each of the ranges. In the unusual sound determination apparatus of Claim 1 or 2,
The abnormal sound occurrence determination unit uses the data obtained by averaging the vehicle interior sound data measured by the vehicle interior sound measurement unit at predetermined time intervals, and an average value exceeding a predetermined threshold reaches a predetermined number of times. An abnormal sound determination device that determines that an abnormal sound has occurred in the event of a failure. In the unusual sound determination apparatus of any one of Claims 1-3,
An environmental sound measuring unit for collecting sound outside the vehicle;
When environmental sound data that exceeds a predetermined threshold and is shorter than a predetermined time is measured by the environmental sound measurement unit, the abnormal sound generation determination unit is configured to generate the in-vehicle sound measurement unit at the generation timing of the environmental sound data. The abnormal sound determination apparatus characterized by determining whether or not an abnormal sound has occurred using data obtained by deleting the vehicle interior sound data measured by the above or subtracting the environmental sound data from the vehicle interior sound data.

Images