JP2021099080A - Abnormality detection device and abnormality detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an "abnormality detection device and anomaly detection method" capable of detecting an abnormality occurring in a power generator of a shared vehicle, not limited to a part related to the start of a power generator. SOLUTION: A noise characteristic information generation unit 14 for generating noise characteristic information of a power generator, an operation state acquisition unit 11 for acquiring information indicating an operation state of the power generator, and a place different from the power generator are generated. The other state acquisition unit 13 that acquires information indicating the state related to the factors of other sounds that can occur, the noise characteristic information storage unit 10 that stores noise characteristic information in association with the power-related state information and the other sound-related state information, and the noise characteristics. An abnormality determination unit 17 for determining an abnormality of the power generator by comparing the past cancellation sound-related information stored in the information storage unit 10 with the current cancellation sound-related information is provided, and the power generator is started. Based on the information obtained regardless of whether the time or the vehicle is running, the abnormality of the power generator is determined by comparing the current value with the past value. [Selection diagram] Fig. 1

Description

The present invention relates to an abnormality detection device and an abnormality detection method, and is particularly suitable for use in a device and a method for detecting an abnormality in a vehicle power generator.

In recent years, car sharing in which a specific car is shared and used by a plurality of member users has become widespread. In car sharing, the user can rent a shared car at a desired timing and can return the shared car at a desired timing. In the future, it is expected that the trend from owning cars to sharing will accelerate.

In the case of an owned vehicle, since the user repeatedly uses the same vehicle on a daily basis, the sound emitted from the power generator (engine in the case of a gasoline vehicle or a hybrid vehicle, or in the case of an electric vehicle or a hybrid vehicle or a motor) ( It was possible to detect that the power noise was different from usual and take measures to prevent major failures, such as sending it out for inspection as soon as possible. On the other hand, in the case of a shared vehicle, the user who is only temporarily using this cannot compare the current power sound with the previous power sound, so it is difficult for the user to notice the abnormal noise of the power generator. There was a problem.

It should be noted that a technique is known that enables accurate diagnosis without overlooking an engine malfunction (see, for example, Patent Document 1). In Patent Document 1, the memorized past start engine sound and the current start engine sound are compared, and when they do not match within a predetermined error, an engine-related part (battery or starter, alternator) It is disclosed that it is judged that there is an abnormality in the engine.

Further, Patent Document 2 discloses a device that controls noise by outputting a canceling sound having a phase opposite to that of engine noise from a speaker. The noise control device described in Patent Document 2 is an adaptive filter that forms a cancel signal using an engine pulse as a reference signal, and noise of the adaptive filter based on a predetermined reference value corresponding to an engine rotation speed prepared in advance. It is equipped with an effect reduction judgment unit that judges and warns the reduction of the control effect.

Japanese Unexamined Patent Publication No. 4-363641 Japanese Patent No. 352018

If the technique described in Patent Document 1 is applied to a shared vehicle, it is possible to detect an abnormality in the engine and notify the user. However, in the technique described in Patent Document 1, since the abnormality is detected for the engine start sound and the running engine sound is not used, a limited part (battery or starter) related to the engine start is used. , Alternator) There was a problem that only abnormalities could be detected.

The present invention has been made to solve such a problem, and even in a vehicle that is not used repeatedly by the same user on a daily basis, the present invention is not limited to the part related to the start of the power generator. The purpose is to be able to detect abnormalities that occur in the power generator.

In order to solve the above-mentioned problems, in the present invention, noise characteristic information indicating the characteristics of noise generated according to the operating state of the power generator provided in the vehicle is generated, and the power-related state indicating the operating state of the power generator is generated. Acquires information and other sound-related state information indicating a state related to other sound factors that may occur in a place different from the power generator, and stores noise characteristic information in association with power-related state information and other sound-related state information. Store in a medium. Then, the past noise characteristic information stored in the storage medium in association with the current power-related state information and the current other sound-related state information is acquired, and the current noise characteristic information is compared with the past noise characteristic information. By doing so, it is determined that there is an abnormality in the power generator, and if it is determined that there is an abnormality, a notification is given.

According to the present invention configured as described above, noise characteristic information of the power generator, power-related state information indicating the operating state of the power generator, and factors of other sounds that may occur in a place different from the power generator. All other sound-related state information indicating the state related to is information obtained regardless of whether the power generator is started or the vehicle is running, and based on this information, under the same state. Abnormality of the power generator is determined by comparing the noise characteristic information generated now and in the past. Therefore, even in a vehicle that is not repeatedly used by the same user on a daily basis, it is possible to detect an abnormality that occurs in the power generator, not limited to the portion related to the start of the power generator.

It is a block diagram which shows the functional structure example of the abnormality detection apparatus by 1st Embodiment. It is a figure which shows the structural example of the cancellation sound generation part by 1st Embodiment. It is a figure which shows typically the storage contents of the noise characteristic information storage part by 1st Embodiment. It is a flowchart which shows the operation example of the abnormality detection apparatus by 1st Embodiment. It is a figure which shows the example of the functional structure of a part of the abnormality detection apparatus by 2nd Embodiment. It is a figure which shows the functional structure example of the abnormality detection apparatus according to 3rd Embodiment. It is a figure which shows the structural example of the cancellation sound generation part by 3rd Embodiment.

(First Embodiment)
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a functional configuration example of the abnormality detection device 1 according to the first embodiment. The abnormality detection device 1 according to the first embodiment is mounted on the vehicle. In particular, it is suitable for mounting on a shared vehicle that is shared and used by a plurality of member users.

As shown in FIG. 1, the abnormality detection device 1 according to the first embodiment has the operation state acquisition unit 11, the cancellation sound generation unit 12, the other state acquisition unit 13, the noise characteristic information generation unit 14, and the noise characteristics as functional configurations. It includes an information recording unit 15, a noise characteristic information acquisition unit 16, an abnormality determination unit 17, and an abnormality notification unit 18. Further, the abnormality detection device 1 of the present embodiment includes a noise characteristic information storage unit 10 as a storage medium.

Each of the above functional blocks 11 to 18 can be configured by any of hardware, DSP (Digital Signal Processor), and software. For example, when configured by software, each of the above functional blocks 11 to 18 is actually configured to include a computer CPU, RAM, ROM, etc., and is a program stored in a recording medium such as RAM, ROM, hard disk, or semiconductor memory. Is realized by the operation of.

The operating state acquisition unit 11 acquires power-related state information indicating the operating state of the power generator included in the vehicle. In the case of a gasoline vehicle equipped with an engine (internal combustion engine), the power generator is the engine. In this case, the operating state acquisition unit 11 acquires engine speed information as power-related state information. Specifically, the operating state acquisition unit 11 obtains the engine speed measured by the engine speed measuring instrument (tachometer) mounted on the vehicle from the ECU (Electronic Control Unit) via the CAN (Controller Area Network). get.

Further, in the case of an electric vehicle capable of obtaining power by driving a motor by electricity, the power generator is a motor. In this case, the operating state acquisition unit 11 acquires the motor vibration information as the power-related state information. Specifically, the operating state acquisition unit 11 acquires the waveform information of the motor vibration measured by the motor vibration detection sensor mounted on the vehicle from the ECU via the CAN. Instead of the waveform information of the motor vibration, the rotation speed of the motor may be acquired.

Further, in the case of a hybrid vehicle having two power sources of an engine and a motor, the power generator is an engine and a motor. In this case, the operating state acquisition unit 11 acquires engine rotation speed information and motor vibration waveform information or motor rotation speed information as power-related state information.

The canceling sound generation unit 12 generates a canceling sound to be given to the noise corresponding to the operating state generated in the power generator based on the power-related state information acquired by the operating state acquisition unit 11. The power-related state information acquired by the operating state acquisition unit 11 is used as reference information when generating the canceling sound. The noise according to the operating state generated in the power generator means engine noise according to the engine speed, motor vibration, or motor noise according to the motor speed. The canceling sound is a sound having the same amplitude as the noise and a waveform having an opposite phase.

FIG. 2 is a diagram showing a configuration example of the cancellation sound generation unit 12. As shown in FIG. 2, the cancellation sound generation unit 12 includes a controller 21, a speaker 22, and a microphone 23. The speaker 22 outputs a canceling sound having the same amplitude and antiphase as the noise emitted from the power generator 100, which is a noise source, to the atmosphere. The microphone 23 detects the residual sound, which is the result of interference between the noise and the canceling sound, as an error signal.

The controller 21 is configured to include an adaptive filter (ADF), and refers to power-related state information (engine rotation speed, motor vibration, or motor rotation speed) acquired by the operating state acquisition unit 11 with respect to the adaptive filter. In addition to inputting as information, the residual sound detected by the microphone 23 is input as a feedback signal. Then, by adjusting the filter coefficient so that the residual sound is as close to zero as possible, a canceling sound having the same amplitude and antiphase as the noise in the frequency band specified based on the reference information is generated.

The noise generated from the power generator 100 changes depending on its operating state. Specifically, in the frequency band corresponding to the operating state of the power generator 100, noise having a larger amplitude than other frequency bands is generated. The controller 21 generates a canceling sound having the same amplitude and opposite phase as the noise strongly generated in the frequency band corresponding to this operating state and outputs the noise to the speaker 22, thereby producing the noise emitted from the power generator 100 to the atmosphere. Reduce.

The frequency band according to the operating state of the power generator 100 can be specified based on a function for converting the engine speed or the motor speed into a frequency. Alternatively, the frequency band according to the operating state of the power generator 100 may be specified by referring to the table information stored in association with the engine speed or the motor speed and the frequency. When the power-related state information is the waveform information of the motor vibration, it is converted into frequency information by DFT (discrete Fourier transform) or the like, and the frequency band having the largest amplitude is the frequency band corresponding to the operating state of the power generator 100. It is possible to specify as. As an example of DFT, FFT (fast Fourier transform) processing may be performed.

In addition to the noise generated in the power generator 100 according to its operating state, the other state acquisition unit 13 provides other sound-related state information indicating a state related to a factor of the other sound that may be generated in a place different from the power generator 100. get. Another sound that can be generated separately from the noise at a place different from the power generator 100 is, for example, road noise. Road noise is noise generated in the vehicle interior due to stimulation of the road surface while the vehicle is traveling. That is, the tire elastically vibrates due to the unevenness of the road surface, and the vibration is transmitted to the vehicle body to generate noise.

Which frequency band the road noise has a large amplitude depends on the vehicle speed. Therefore, the other state acquisition unit 13 acquires the vehicle speed-related information related to the vehicle speed as the other sound-related state information indicating the state related to the factor of the road noise. The vehicle speed-related information is, for example, vehicle speed information measured by a speedometer mounted on a vehicle. Alternatively, the wheel rotation speed information detected by the acceleration sensor installed on the wheel may be acquired as vehicle speed-related information. The other state acquisition unit 13 acquires the vehicle speed-related information from the ECU via the CAN.

Further, another sound that can be generated separately from the noise at a place different from the power generator 100 is, for example, a wind noise. Wind noise is noise generated by the flow of air outside the vehicle while the vehicle is running. In a moving vehicle, the wind hits the front of the vehicle and flows to the left and right, and the wind that flows to the left and right collides with the wind generated in the direction of travel to create a vortex, which hits the window on the side of the vehicle. Wind noise is generated. If you open the window while driving, the wind noise will be louder and unpleasant.

The amplitude of the wind noise depends on the opening of the window. Therefore, the other state acquisition unit 13 provides window opening information indicating the opening degree of the window (whether or not the window is open and how much it is open) as the other sound-related state information indicating the state related to the factor of the wind noise. get. The window opening information is acquired from the ECU that controls the operation of the power window via the CAN.

Further, another sound that can be generated separately from the noise at a place different from the power generator 100 is, for example, a conversation sound of an occupant. The other state acquisition unit 13 acquires the number of occupants information indicating the number of occupants as the other sound-related state information indicating the state related to the factor that generates the conversation sound. The number of occupants can be detected by various methods. For example, it is possible to detect the number of occupants by photographing the inside of the vehicle with a camera installed in the vehicle and analyzing the photographed image. Alternatively, it is also possible to detect the number of occupants based on the seating detection result by the seating sensor installed for each seat.

The other state acquisition unit 13 acquires at least one of vehicle speed-related information regarding the road noise factor, window opening information regarding the wind noise factor, and occupant number information regarding the conversation sound factor. However, it is preferable to acquire all of this information. The reason is as follows. Not only the noise emitted from the power generator 100 to the atmosphere but also other sounds generated in the vehicle are input to the microphone 23 shown in FIG. Therefore, the canceling sound generated by the controller 21 based on the residual sound input to the microphone 23 is affected by other sounds and fluctuates. Then, as will be described later, in the present embodiment, the abnormality of the power generator 100 is determined by using this canceling sound. Therefore, it is important to more accurately grasp what kind of canceling sound is generated in the environment where other sounds are generated in order to make a more accurate determination.

The noise characteristic information generation unit 14 generates noise characteristic information indicating the characteristics of noise generated in the power generator 100 according to its operating state. In the present embodiment, the noise characteristic information generation unit 14 generates the cancellation sound characteristic information indicating the characteristics of the cancellation sound generated by the cancellation sound generation unit 12 as the noise characteristic information.

Specifically, the noise characteristic information generation unit 14 has strength information (amplitude) at a frequency specified by the power-related state information acquired by the operating state acquisition unit 11 for the cancellation sound generated by the cancellation sound generation unit 12. Is generated as noise characteristic information. As described above, the canceling sound is generated so that its amplitude is the same as the amplitude of the noise. Therefore, the amplitude on the frequency spectrum obtained by frequency-converting the canceling sound can be regarded as noise intensity information, that is, noise characteristic information indicating noise characteristics.

For example, the noise characteristic information generation unit 14 generates a frequency spectrum showing the relationship between the frequency and the amplitude by performing the DFT process on the cancellation sound generated by the cancellation sound generation unit 12. Then, in the generated frequency spectrum, the amplitude (intensity information of the canceling sound) at the frequency specified by the power-related state information (engine rotation speed, motor vibration or motor rotation speed) is generated as noise characteristic information. As an example of DFT, FFT processing may be performed.

The noise characteristic information recording unit 15 acquires the noise characteristic information (canceling sound characteristic information) generated by the noise characteristic information generation unit 14 by the power-related state information acquired by the operating state acquisition unit 11 and the other state acquisition unit 13. It is stored in the noise characteristic information storage unit 10 in association with the other sound-related state information.

FIG. 3 is a diagram schematically showing noise characteristic information stored in association with power-related state information and other sound-related state information in the noise characteristic information storage unit 10. Note that FIG. 3 is shown for explaining how the noise characteristic information is stored, and it is not always necessary to store the noise characteristic information as table information having such a structure.

As shown in FIG. 3, the noise characteristic information recording unit 15 classifies the noise frequency of the power generator 100 specified by the power-related state information into a plurality of sections, and divides the noise characteristic information into each section to obtain the noise characteristics. It is stored in the information storage unit 10. That is, assuming that the noise of the power generator 100 is generated in the frequency band of 20 to 500 Hz, this frequency band is divided into predetermined frequencies (for example, every 10 Hz), and the frequency of 20 to 30 Hz is based on the power-related state information. The amplitude of the canceling sound specified as, the amplitude of the canceling sound specified as the frequency of 30 to 40 Hz based on the power-related state information, and so on, and so on, the amplitude of the canceling sound is stored separately for each of a plurality of frequency sections. Let me. This means that the noise characteristic information is stored in association with the power-related state information.

Further, as shown in FIG. 3, the noise characteristic information recording unit 15 classifies the vehicle speed indicated by the vehicle speed-related information into a plurality of levels, classifies the window opening degree indicated by the window opening degree information into a plurality of levels, and classifies the occupants. After classifying the number of occupants indicated by the numerical information into a plurality of levels, the noise characteristic information is stored in the noise characteristic information storage unit 10 by dividing it into different combinations of each classification of other sound-related state information. In the example of FIG. 3, the vehicle speed is classified into three levels of 0 to 30 km / h, 30 to 60 km / h, and more than 60 km / h. Further, the opening degree of the window is classified into three levels of 0% (closed state), 0 to 10%, and more than 10%. In addition, the number of occupants is classified into two levels of one, two or more. In FIG. 3, circles indicate the corresponding classifications regarding vehicle speed, window opening, and number of occupants. That is, the amplitude of the canceling sound is stored as noise characteristic information by dividing it into each combination of a plurality of patterns of other sound-related state information marked with a circle. This means that the noise characteristic information is stored in association with the other sound-related state information.

The content of the classification shown in FIG. 3 is an example, and the present invention is not limited thereto. For example, with respect to road noise, the road surface condition of the running road (for example, paved road or unpaved road) may be added to the classification factor. Information on the road surface condition can be obtained from, for example, map data of the navigation device. For wind noise, the location of the open window may be added to the classification factor. For conversation sounds, the location of the occupant may be added to the classification factor.

The noise characteristic information recording unit 15 repeatedly stores the noise characteristic information in the noise characteristic information storage unit 10 at regular intervals, for example. However, the noise characteristic information stored in the repetitive noise characteristic information storage unit 10 is only the noise characteristic information used as the determination target when the abnormality determination unit 17 determines that the power generator 100 has no abnormality. As a result, in the noise characteristic information storage unit 10, the noise characteristic information when it is determined that there is no abnormality in the power generator 100 is associated with the power-related state information and the other sound-related state information as shown in FIG. It gradually accumulates in the state. It is not essential that all the noise characteristic information generated at a fixed cycle is continuously stored in the noise characteristic information storage unit 10. For example, the noise characteristic information for which a predetermined time has elapsed from the time recorded by the noise characteristic information recording unit 15 may be deleted from the noise characteristic information storage unit 10.

Instead of repeatedly storing the noise characteristic information in the noise characteristic information storage unit 10 at a fixed cycle, the noise characteristic information recording unit 15 uses the occurrence of a predetermined event as a trigger to generate the noise characteristic information at the timing when the event occurs. May be stored in the noise characteristic information storage unit 10. For example, the trigger is that the section to which the noise frequency specified from the power-related state information belongs has changed, or that the pattern of the combination of classifications corresponding to the vehicle speed, the opening of the window, and the number of occupants has changed. The noise characteristic information storage unit 10 may store the noise characteristic information specified based on the cancellation sound generated by the cancellation sound generation unit 12 after the change occurs.

The noise characteristic information acquisition unit 16 is based on the current power-related state information acquired by the operating state acquisition unit 11 and the current other sound-related state information acquired by the other state acquisition unit 13, and the current power-related state. The past noise characteristic information stored in the noise characteristic information storage unit 10 is acquired in association with the information and the other sound-related state information. For example, the noise frequency of the power generator 100 specified by the current power-related state information acquired by the operating state acquisition unit 11 is in the range of 20 to 30 Hz, and the current noise frequency acquired by the other state acquisition unit 13 is present. When the vehicle speed is 0 to 30 km / h, the window opening is 0% (closed state), and the number of occupants is one according to the other sound-related state information, the noise characteristic information acquisition unit 16 determines the noise. The noise characteristic information for a plurality of times in the past, which is stored in association with the combination of the vehicle speed, the opening degree of the window, and the number of occupants in the frequency range of, is acquired from the noise characteristic information storage unit 10.

The abnormality determination unit 17 uses the current noise characteristic information generated by the noise characteristic information generation unit 14 and the noise characteristic information acquisition unit 16 as information indicating the characteristics of the current noise generated in the power generator 100 according to the operating state. The noise characteristic information is compared with the past noise characteristic information acquired from the noise characteristic information storage unit 10, and the abnormality of the power generator 100 is determined based on the comparison result. In the case of a gasoline vehicle, the abnormality determination unit 17 determines the abnormality of the engine. In the case of an electric vehicle, the abnormality determination unit 17 determines the abnormality of the motor. In the case of a hybrid vehicle, the abnormality determination unit 17 determines an abnormality of the engine and the motor.

In the present embodiment, the abnormality determination unit 17 uses the noise characteristic information generation unit 14 to generate the current cancellation sound characteristic information (intensity information indicating the amplitude of the cancellation sound) and the noise characteristic information acquisition unit 16. The past canceling sound characteristic information (similarly, the intensity information indicating the amplitude of the canceling sound) acquired from the characteristic information storage unit 10 is compared, and the abnormality of the power generator 100 is determined based on the comparison result.

For example, the abnormality determination unit 17 calculates an average value for the amplitude of the canceling sound indicated by the past multiple times of canceling sound characteristic information acquired from the noise characteristic information storage unit 10. Then, the amplitude of the canceling sound, which is the current noise characteristic information, is compared with the average value of the amplitude of the canceling sound calculated from the noise characteristic information for a plurality of times in the past as described above, and both amplitudes are within a predetermined error. If they do not match, it is determined that there is an abnormality in the power generator 100. Here, the abnormality determination unit 17 calculates the average value of the amplitude of the past canceling sound, but the noise characteristic information recording unit 15 calculates the average value, and the noise characteristic information storage unit 10 calculates the average value. You may make it memorize.

The abnormality notification unit 18 notifies when the abnormality determination unit 17 determines that there is an abnormality in the power generator 100. For example, the abnormality notification unit 18 displays a warning on the instrument panel of the vehicle or a display installed in the vehicle. Along with the warning display, a warning sound may be emitted from the speaker 22 installed in the vehicle. Further, the abnormality notification unit 18 may make a report to the terminal of the management center that manages the operation of the shared vehicle via the Internet or a communication network such as a mobile phone network. This notification can be made by means of, for example, e-mail, short mail, Web mail, or the like. Alternatively, the abnormality notification unit 18 may make a report to the server of the management center, and the server may display a warning on the management screen so that the management screen can be viewed from the administrator's terminal.

FIG. 4 is a flowchart showing an operation example of the abnormality detection device 1 according to the first embodiment configured as described above. The flowchart shown in FIG. 4 starts when the power of the abnormality detection device 1 is turned on.

First, the abnormality detection device 1 determines, for example, whether or not it is time to record the noise characteristic information in the noise characteristic information storage unit 10 at regular intervals (step S1). When it is time to record the noise characteristic information, the operation state acquisition unit 11 indicates the power-related state information (engine rotation speed in the case of a gasoline vehicle, motor vibration or motor vibration in the case of an electric vehicle) indicating the operation state of the power generator 100. The motor rotation speed, the engine rotation speed in the case of a hybrid vehicle, and the motor vibration or the motor rotation speed) are acquired (step S2).

Further, the other state acquisition unit 13 indicates other sound-related state information (vehicle speed-related information regarding the road noise factor, window regarding the wind noise factor) indicating a state related to the other sound factor that may occur at a place different from the power generator 100. Acquire opening information (at least one of occupant number information related to factors of conversation sound) (step S3).

Next, the cancellation sound generation unit 12 should give a cancellation sound to the noise corresponding to the operation state generated in the power generator 100 based on the power-related state information acquired by the operation state acquisition unit 11 in step S2. Is generated (step S4). Then, the noise characteristic information generation unit 14 uses the power generator to generate the cancellation sound characteristic information (amplitude of the cancellation sound at the frequency specified by the power-related state information) indicating the characteristics of the cancellation sound generated by the cancellation sound generation unit 12. It is generated as noise characteristic information indicating the characteristics of the noise generated according to the operating state of 100 (step S5).

Further, the noise characteristic information acquisition unit 16 includes the current power-related state information acquired by the operating state acquisition unit 11 in step S2 and the current other sound-related state information acquired by the other state acquisition unit 13 in step S3. Based on the above, the past noise characteristic information stored in the noise characteristic information storage unit 10 in association with the current power-related state information and the other sound-related state information is acquired (step S6).

Then, the abnormality determination unit 17 includes the current noise characteristic information generated by the noise characteristic information generation unit 14 in step S5 and the past acquired from the noise characteristic information storage unit 10 by the noise characteristic information acquisition unit 16 in step S6. The noise characteristic information is compared, and the abnormality of the power generator 100 is determined based on the comparison result (step S7).

Here, when the abnormality determination unit 17 determines that there is no abnormality in the power generator 100, the noise characteristic information recording unit 15 uses the noise characteristic information generated by the noise characteristic information generation unit 14 in step S5 to obtain the noise characteristic information in step S2. The noise characteristic information storage unit 10 stores the power-related state information acquired by the operating state acquisition unit 11 in step S3 and the other sound-related state information acquired by the other state acquisition unit 13 in step S3 (step S8).

On the other hand, when the abnormality determination unit 17 determines that the power generator 100 has an abnormality, the abnormality notification unit 18 gives a predetermined notification to the management sensor connected in the vehicle or through the communication network (step S9). After the process of step S8 or step S9, the abnormality detection device 1 determines whether or not the power is turned off (step S10). If the power is not turned off, the process returns to step S1. On the other hand, when the power is turned off, the processing of the flowchart shown in FIG. 4 is terminated.

The cancellation sound generation process in steps S2 and S4 may be performed asynchronously with the flowchart shown in FIG. 4 regardless of whether or not the recording timing has been reached.

As described in detail above, in the first embodiment, the noise characteristic information of the power generator 100 is generated by the noise characteristic information generation unit 14, and the power-related state information indicating the operating state of the power generator 100 is generated. The operation state acquisition unit 11 and the other state acquisition unit 13 acquire the other sound-related state information indicating the state related to the factors of the other sound that may occur in a place different from the power generator 100, and the noise characteristic information is the power-related state information. The noise characteristic information storage unit 10 stores the information in association with the other sound-related state information. Then, the current noise characteristic information generated by the noise characteristic information generation unit 14, the current power-related state information, and the past noise stored in the noise characteristic information storage unit 10 in association with the current other sound-related state information. An abnormality of the power generator 100 is determined by comparing with the characteristic information, and when it is determined that there is an abnormality, a notification is given.

Here, noise characteristic information of the power generator 100, power-related state information indicating the operating state of the power generator 100, and other sounds indicating states related to factors of other sounds that may occur in a place different from the power generator 100. All of the related state information is information obtained regardless of whether the power generator 100 is started or the vehicle is running, and based on this information, it is generated now and in the past under the same state. The abnormality of the power generator 100 is determined by comparing the noise characteristic information. Therefore, according to the first embodiment, even in a shared vehicle that is not repeatedly used by the same user on a daily basis, it occurs not only in the portion related to the start of the power generator 100 but also in the power generator 100. Abnormality can be detected.

In the first embodiment, an example in which the cancellation sound characteristic information generated by the noise characteristic information generation unit 14 is used as the noise characteristic information for the cancellation sound generated by the cancellation sound generation unit 12 has been described. Is not limited to this. For example, the noise characteristic information generation unit 14 may generate the control information set when the cancellation sound generation unit 12 generates the cancellation sound as the noise characteristic information. The filter coefficient of the adaptive filter may be used as the control information set when the canceling sound generation unit 12 generates the canceling sound. This also applies to the second embodiment described below.

As described above, since the canceling sound is generated so that its amplitude is the same as the amplitude of the noise, the amplitude of the canceling sound can be regarded as noise characteristic information indicating the noise characteristics. Further, the control information set when generating the canceling sound having the same amplitude as the noise can be said to be the information associated with the canceling sound. Therefore, the control information set when the canceling sound generation unit 12 generates the canceling sound can also be regarded as the noise characteristic information indicating the noise characteristic.

In this way, when the control information of the canceling sound generation unit 12 is used as the noise characteristic information, the abnormality determination unit 17 uses the current control information generated by the noise characteristic information generation unit 14 and the noise characteristic information acquisition unit 16. The past control information acquired from the characteristic information storage unit 10 is compared, and the abnormality of the power generator 100 is determined based on the comparison result.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a diagram showing a partial functional configuration example of the abnormality detection device 1A according to the second embodiment. As shown in FIG. 5, the abnormality detection device 1A according to the second embodiment has the noise characteristic information generation unit 14A and the noise characteristic information generation unit 14A instead of the noise characteristic information generation unit 14 and the abnormality determination unit 17 shown in FIG. The abnormality determination unit 17A is provided. Other functional configurations are the same as those of each functional configuration shown in FIG.

The noise characteristic information generation unit 14A generates intensity information and phase information at a frequency specified by the power-related state information acquired by the operating state acquisition unit 11 as noise characteristic information for the canceling sound generated by the controller 21. Further, the noise characteristic information generation unit 14A generates phase information at a frequency specified by the power-related state information acquired by the operating state acquisition unit 11 as noise characteristic information for the residual sound detected by the microphone 23.

For example, the noise characteristic information generation unit 14A generates a frequency spectrum showing the relationship between frequency and amplitude based on the canceling sound generated by the controller 21, and also generates a frequency spectrum showing the relationship between frequency and phase. Generate. Further, the controller 21 generates the amplitude and phase at the frequency specified by the power-related state information as noise characteristic information in the two generated frequency spectra. Further, the noise characteristic information generation unit 14A generates a frequency spectrum showing the relationship between the frequency and the phase of the residual sound, and generates the phase at the frequency specified by the power-related state information as the noise characteristic information.

The abnormality determination unit 17A makes the first determination and the second determination described below. The first determination is the same as the determination described in the first embodiment. That is, the abnormality determination unit 17A receives the intensity information (amplitude) of the canceling sound generated by the noise characteristic information generation unit 14A as the current noise characteristic information from the canceling sound generated by the controller 21, and the noise characteristic information acquisition unit 16. The first determination is made as to whether or not the amplitudes match within a predetermined error by comparing with the intensity information (amplitude) of the canceling sound acquired from the noise characteristic information storage unit 10 as the past noise characteristic information.

Further, the abnormality determination unit 17A compares the phase information of the canceling sound generated by the noise characteristic information generation unit 14A as the current noise characteristic information with the phase information generated for the residual sound by the noise characteristic information generation unit 14A. , A second determination is made as to whether or not the phases match within a predetermined error.

Then, the abnormality determination unit 17A generates power when it is determined in the first determination that the amplitudes do not match within a predetermined error and in the second determination that the phases match within a predetermined error. It is determined that there is an error in the vessel 100. Even if the amplitudes do not match within a predetermined error in the first determination, if the phases do not match within a predetermined error in the second determination, it occurs at a place different from the power generator 100. In this case, the abnormality determination unit 17A does not determine that the power generator 100 has an abnormality because the amplitude may be deviated due to the influence of noise.

According to the second embodiment configured as described above, it is possible to more accurately determine whether or not the power generator 100 has an abnormality.

(Third Embodiment)
Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a diagram showing a functional configuration example of the abnormality detection device 1B according to the third embodiment. In FIG. 6, those having the same reference numerals as those shown in FIG. 1 have the same functions, and therefore, duplicate description will be omitted here.

As shown in FIG. 6, the abnormality detection device 1B according to the third embodiment has, as a functional configuration, a cancellation sound generation unit 12B and a noise characteristic information generation unit 14 instead of the cancellation sound generation unit 12 and the noise characteristic information generation unit 14 shown in FIG. The noise characteristic information generation unit 14B is provided.

The noise characteristic information generation unit 14B generates noise intensity information at a frequency specified by the power-related state information acquired by the operating state acquisition unit 11 as noise characteristic information. The noise characteristic information generation unit 14 according to the first embodiment and the noise characteristic information generation unit 14A according to the second embodiment described above generate the intensity information of the canceling sound as noise characteristic information. On the other hand, the noise characteristic information generation unit 14B according to the third embodiment generates the intensity information of the noise itself of the power generator 100 as the noise characteristic information.

The canceling sound generation unit 12B generates a canceling sound that cancels the road noise, the wind noise, and the conversation sound in the configuration using the adaptive filter as in FIG. FIG. 7 is a diagram showing a configuration example of the cancellation sound generation unit 12B. As shown in FIG. 7, the cancellation sound generation unit 12B includes a controller 31, a speaker 32, and a microphone 33. In the third embodiment, as the microphone 33, for example, a directional microphone configured to be able to detect the direction in which sound arrives is used.

The controller 31 is based on the sound input from the microphone 33 based on the frequency of the sound specified based on the other sound-related state information acquired by the other state acquisition unit 13 and the arrival direction of the sound detected by the microphone 33. Road noise, wind noise, and conversation sound are separated, and a canceling sound that cancels each of them is generated and output from the speaker 32.

With respect to the road noise, a canceling sound that cancels the road noise at a frequency specified by the vehicle speed is generated based on the vehicle speed-related information acquired by the other state acquisition unit 13. Regarding the wind noise, for example, the location of the open window is specified based on the information from the ECU, the sound input to the microphone 33 is separated from that direction, and the canceling sound that cancels the separated wind noise. To generate. Regarding the conversation sound, for example, by analyzing the image taken by the camera installed in the car, the direction in which the occupant having a conversation is located is identified, and the sound input to the microphone 33 is separated from that direction. , Generates a canceling sound that cancels the separated conversation sound.

By outputting the canceling sound that cancels the road noise, the wind noise, and the conversation sound from the speaker 32, the residual sound detected by the microphone 33 becomes a sound corresponding to the noise generated by the power generator 100. The noise characteristic information generation unit 14B provides intensity information (amplitude) at a frequency specified by the power-related state information acquired by the operating state acquisition unit 11 for the noise of the power generator 100 detected as residual sound by the microphone 33. , Generated as noise characteristic information.

The noise extraction method shown here is only an example, and is not limited to this.

In the third embodiment, the noise characteristic information recording unit 15 stores the noise intensity information (amplitude) generated by the noise characteristic information generation unit 14B in the noise characteristic information storage unit 10. The abnormality determination unit 17 includes the noise amplitude, which is the current noise characteristic information generated by the noise characteristic information generation unit 14B, and the past noise characteristic information acquired from the noise characteristic information storage unit 10 by the noise characteristic information acquisition unit 16. It is determined whether or not the noise amplitudes match within a predetermined error by comparing with the noise amplitudes, and if they do not match, it is determined that the power generator 100 has an abnormality.

In the third embodiment configured as described above, only the noise of the power generator 100 is detected by the microphone 33 by outputting the road noise, the wind noise, and the canceling sound of the conversation sound, and the noise itself is used. Since the noise characteristic information is generated, the noise characteristic information can be generated in a state where the influence of other sounds is eliminated as much as possible, and it becomes possible to more accurately determine the presence or absence of an abnormality in the power generator 100.

In the above embodiment, as illustrated in FIG. 3, vehicle speed-related information related to road noise factors, window opening information related to wind noise factors, and occupant number information related to conversation noise factors are classified into a plurality of levels. An example of recording noise characteristic information for each pattern according to a combination of each classification has been described, but the present invention is not limited to this. For example, only vehicle speed-related information is classified into multiple levels, and it is detected based on the window opening information that all windows are closed, and that the occupants are not talking, for example, by analyzing images taken by a camera. Only when it is detected, the noise characteristic information may be recorded in the noise characteristic information storage unit 10 in association with the power-related state information and the vehicle speed-related information.

In this case, the abnormality determination unit 17 (17A) is generated by the noise characteristic information generation unit 14 only when it is detected that all the windows are closed and the occupant is not talking. The abnormality of the power generator 100 is determined by comparing the noise characteristic information with the past noise characteristic information acquired from the noise characteristic information storage unit 10 by the noise characteristic information acquisition unit 16 based on the current vehicle speed related information. By doing so, it is possible to generate noise characteristic information in a state where the influence of the wind noise and the conversation sound of the occupant is eliminated as much as possible, and it is possible to more accurately determine the presence or absence of abnormality in the power generator 100.

Only when it is detected based on the window opening information that all windows are closed, the noise characteristic information is associated with the power-related state information and other sound-related state information (vehicle speed-related information and occupant number information). The noise characteristic information storage unit 10 may record the information, and the abnormality of the power generator 100 may be determined only when it is detected that all the windows are closed.

In addition, only when it is detected that the occupant is not talking, the noise characteristic information is stored in the noise characteristic information storage unit in association with the power-related state information and the other sound-related state information (vehicle speed-related information and window opening information). It may be recorded in 10, and the abnormality of the power generator 100 may be determined only when it is detected that the occupant is not talking.

In addition, the first to third embodiments are merely examples of embodiment of the present invention, and the technical scope of the present invention should not be interpreted in a limited manner by these. It is something that does not become. That is, the present invention can be implemented in various forms without departing from its gist or its main features.

1,1A, 1B Anomaly detection device 10 Noise characteristic information storage unit 11 Operating state acquisition unit 12, 12B Cancellation sound generation unit 13 Other state acquisition unit 14, 14A, 14B Noise characteristic information generation unit 15 Noise characteristic information recording unit 16 Noise characteristics Information acquisition unit 17, 17A Abnormality judgment unit 18 Abnormality notification unit

Claims (16)

An operating state acquisition unit that acquires power-related state information indicating the operating state of the power generator provided in the vehicle,
In addition to the noise generated in response to the operating state of the power generator, the other state acquisition unit that acquires other sound-related state information indicating the state related to the factors of other sounds that may occur in a place different from the power generator. ,
A noise characteristic information generator that generates noise characteristic information indicating the characteristics of noise generated in the power generator according to the operating state, and a noise characteristic information generator.
A noise characteristic information recording unit that stores the noise characteristic information generated by the noise characteristic information generation unit in a storage medium in association with the power-related state information and the other sound-related state information.
Acquires the noise characteristic information stored in the storage medium in association with the current power-related state information acquired by the operating state acquisition unit and the current other sound-related state information acquired by the other state acquisition unit. Noise characteristic information acquisition department and
The current noise characteristic information generated by the noise characteristic information generation unit is compared with the past noise characteristic information acquired from the storage medium by the noise characteristic information acquisition unit, and the power generation is performed based on the comparison result. An abnormality judgment unit that determines the abnormality of the vessel, and
An abnormality detection device including an abnormality notification unit that notifies when the power generator is determined to have an abnormality by the abnormality determination unit. Based on the power-related state information acquired by the operating state acquisition unit, a canceling sound generating unit that generates a canceling sound to be given to the noise generated in the power generator according to the operating state is further provided. ,
The noise characteristic information generation unit generates cancellation sound characteristic information indicating the characteristics of the cancellation sound generated by the cancellation sound generation unit as the noise characteristic information.
The abnormality determination unit compares the current cancellation sound characteristic information generated by the noise characteristic information generation unit with the past cancellation sound characteristic information acquired from the storage medium by the noise characteristic information acquisition unit, and the result thereof. The abnormality detection device according to claim 1, wherein the abnormality of the power generator is determined based on the comparison result. Based on the power-related state information acquired by the operating state acquisition unit, a canceling sound generating unit that generates a canceling sound to be given to the noise generated in the power generator according to the operating state is further provided. ,
The noise characteristic information generation unit generates control information set when the cancellation sound generation unit generates the cancellation sound as the noise characteristic information.
The abnormality determination unit compares the current control information generated by the noise characteristic information generation unit with the past control information acquired from the storage medium by the noise characteristic information acquisition unit, and is based on the comparison result. The abnormality detection device according to claim 1, wherein the abnormality of the power generator is determined. The noise characteristic information recording unit uses the noise characteristic information generated by the noise characteristic information generation unit to obtain the power-related state information only when the abnormality determination unit determines that there is no abnormality in the power generator. The abnormality detection device according to claim 1, wherein the information is stored in a storage medium in association with the other sound-related state information. The above power generator is an engine
The abnormality detection device according to claim 1, wherein the operating state acquisition unit acquires engine speed information as the power-related state information. The above power generator is a motor
The abnormality detection device according to claim 1, wherein the operating state acquisition unit acquires motor vibration information or motor rotation speed information as the power-related state information. The first aspect of the present invention is that the noise characteristic information generation unit generates the noise intensity information at the frequency specified by the power-related state information acquired by the operating state acquisition unit as the noise characteristic information. The described anomaly detection device. The noise characteristic information generation unit uses the intensity information at the frequency specified by the power-related state information acquired by the operation state acquisition unit as the noise characteristic information for the cancellation sound generated by the cancellation sound generation unit. The abnormality detection device according to claim 2, wherein the abnormality detection device is generated. The above-mentioned cancellation sound generator
With the controller that generates the above cancellation sound,
A speaker that outputs the canceling sound generated by the above controller,
It is equipped with a microphone that detects residual sound that is the result of interference between the noise and the canceling sound.
The noise characteristic information generation unit uses the intensity information and the phase information at the frequency specified by the power-related state information acquired by the operation state acquisition unit as the noise characteristic information for the cancellation sound generated by the controller. At the same time, with respect to the residual sound detected by the microphone, phase information at a frequency specified by the power-related state information acquired by the operating state acquisition unit is generated as the noise characteristic information.
The above abnormality judgment unit
From the canceling sound generated by the controller, as the current noise characteristic information, the intensity information of the canceling sound generated by the noise characteristic information generation unit and the past noise characteristics from the storage medium by the noise characteristic information acquisition unit. By comparing with the intensity information of the above-mentioned canceling sound acquired as information, the first determination as to whether or not the intensities match within a predetermined error is performed, and at the same time,
The current noise characteristic information includes the phase information of the canceling sound generated by the noise characteristic information generation unit, and the current noise characteristic information includes the phase information generated by the noise characteristic information generation unit for the residual sound. A second determination is made as to whether or not the phases match within a predetermined error by comparing.
If it is determined in the first determination that the intensities do not match within a predetermined error, and if it is determined in the second determination that the phases match within a predetermined error, there is an abnormality in the power generator. The abnormality detection device according to claim 2, wherein the abnormality is determined. The abnormality detection device according to claim 3, wherein the noise characteristic information generation unit uses the filter coefficient of the adaptive filter as the control information set when the cancellation sound generation unit generates the cancellation sound. .. Another sound that can be generated separately from the above noise in a place different from the above power generator is road noise.
The abnormality detection device according to claim 1, wherein the other state acquisition unit acquires vehicle speed-related information related to vehicle speed as other sound-related state information indicating a state related to the above factors. Another sound that can be generated separately from the above noise in a place different from the above power generator is wind noise.
The abnormality detection device according to claim 1, wherein the other state acquisition unit acquires window opening information indicating a window opening degree as other sound-related state information indicating a state related to the above factors. Other sounds that can be generated separately from the above noise in a place different from the above power generator are the conversation sounds of the occupants.
The abnormality detection device according to claim 1, wherein the other state acquisition unit acquires occupant number information indicating the number of occupants as other sound-related state information indicating a state related to the factor. The noise characteristic information recording unit converts the noise characteristic information generated by the noise characteristic information generation unit into the power-related state information and the vehicle speed only when it is detected that all the windows of the vehicle are closed. Store it in a storage medium in association with related information
The abnormality detection device according to claim 11, wherein the abnormality determination unit determines an abnormality of the power generator only when it is detected that all windows of the vehicle are closed. The noise characteristic information recording unit converts the noise characteristic information generated by the noise characteristic information generation unit into the power-related state information and the vehicle speed only when it is detected that the occupants of the vehicle are not talking. Store it in a storage medium in association with related information
The abnormality detection device according to claim 11, wherein the abnormality determination unit determines an abnormality of the power generator only when it is detected that the occupants of the vehicle are not talking. A step in which the operation state acquisition unit of the abnormality detection device acquires power-related state information indicating the operation state of the power generator provided in the vehicle, and
The other state acquisition unit of the abnormality detection device indicates a state related to a factor of the other sound that may be generated in a place different from the power generator, in addition to the noise generated in the power generator according to the operation state. Steps to get related state information and
A step in which the noise characteristic information generation unit of the abnormality detection device generates noise characteristic information indicating the characteristics of the noise generated in the power generator according to the operating state.
A step in which the noise characteristic information recording unit of the abnormality detection device stores the noise characteristic information generated by the noise characteristic information generation unit in a storage medium in association with the power-related state information and the other sound-related state information. ,
The noise characteristic information acquisition unit of the abnormality detection device associates the current power-related state information acquired by the operation state acquisition unit and the current other sound-related state information acquired by the other state acquisition unit with the storage medium. Steps to acquire the above noise characteristic information stored in
The abnormality determination unit of the abnormality detection device compares the current noise characteristic information generated by the noise characteristic information generation unit with the past noise characteristic information acquired from the storage medium by the noise characteristic information acquisition unit. , The step of determining the abnormality of the power generator based on the comparison result, and
An abnormality detection method, wherein the abnormality notification unit of the abnormality detection device includes a step of notifying when the abnormality determination unit determines that there is an abnormality in the power generator.

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