WO2018127942A1

WO2018127942A1 - Speaker fault diagnosis device and fault diagnosis method

Info

Publication number: WO2018127942A1
Application number: PCT/JP2017/000029
Authority: WO
Inventors: 匡太渡邊
Original assignee: 三菱電機株式会社
Priority date: 2017-01-04
Filing date: 2017-01-04
Publication date: 2018-07-12

Abstract

A fault diagnosis device (1) for a speaker (4) is provided with: a signal determination unit (1-4) for determining an output level of a diagnostic signal in an audible band; a timing determination unit (1-3) for determining a timing at which a noise level in a vehicle is greater than the output level of the diagnostic signal determined by the signal determination unit (1-4); a signal generation unit (2) for outputting the diagnostic signal from the speaker (4) in the vehicle at the timing determined by the timing determination unit (1-3); an impedance calculation unit (1-5) for calculating the impedance when the speaker (4) outputs the diagnostic signal; a resonance frequency calculation unit (1-6) for calculating the resonance frequency when the speaker (4) outputs the diagnostic signal; and a fault diagnosis unit (1-7) for diagnosing a fault in the speaker (4) using the calculation results from the impedance calculation unit (1-5) and the resonance frequency calculation unit (1-6).

Description

Speaker abnormality diagnosis device and abnormality diagnosis method

The present invention relates to an abnormality diagnosis device and an abnormality diagnosis method for diagnosing an abnormality of a speaker mounted on a vehicle.

A speaker is connected to the vehicle instrument panel, and a warning sound is output from the speaker. When this speaker breaks down, it is important to detect an abnormality immediately.
Conventionally, whenever a speaker system is started, a DC voltage is applied only once immediately after the start and a speaker connection diagnosis is performed. This is called a DC diagnosis. Alternatively, in an assembly process at a factory or the like, an AC voltage is applied to measure the impedance of the speaker, and an abnormality diagnosis of the speaker is performed. This is called AC diagnosis.

DC diagnosis is to detect the current flowing through the speaker when a DC voltage is applied and to measure the DC impedance. Since a DC voltage is applied, there is an advantage that no sound is output from the speaker. On the other hand, since only DC impedance can be measured, there is a drawback that only the presence or absence of speaker connection can be diagnosed. In general, in a speaker system, a plurality of speakers such as a woofer and a tweeter having different frequencies are connected, and a coupling capacitor is often inserted to separate the frequencies. When a coupling capacitor is inserted, direct current does not flow, so that the DC diagnostic cannot measure impedance and cannot diagnose the presence or absence of speaker connection.

AC diagnosis is to detect the current flowing through the speaker when an AC voltage is applied and measure the impedance at each frequency. Even when a coupling capacitor is inserted, there is an advantage that impedance can be measured and a speaker abnormality can be diagnosed. On the other hand, since an AC voltage is applied, a sound is output from the speaker, and a diagnostic sound is heard by the user. Therefore, the timing of performing the AC diagnosis is limited to an assembly process at a factory or an inspection at a dealer. There is a drawback of being.

For example, there is a speaker detection device described in Patent Document 1 as a diagnostic device that outputs sound from a speaker as in AC diagnosis. This speaker detection device outputs a test signal from the speaker and compares the signal level of the test sound collected by the microphone with a threshold level to determine whether or not the speaker is connected.

For example, if an abnormality occurs in a speaker while the vehicle is running, it is necessary to immediately notify the user of the abnormality. However, since the DC diagnosis is performed only immediately after the start as described above, Cannot be detected.
Assuming that a failure has occurred, it is necessary to detect not only a poor speaker connection, but also a failure or failure in which the speaker diaphragm is pressed and almost no sound can be output. For this reason, DC diagnosis just after starting the speaker system is not sufficient, and it is necessary to diagnose whether sound can be output during speaker operation. However, if AC diagnosis is performed during speaker operation, a sound is output, and the user can hear a diagnostic sound.

JP 2002-330498 A

Since the conventional speaker abnormality diagnosis method is configured as described above, in the DC diagnosis implementation immediately after starting the speaker system and the AC diagnosis implementation at the factory or dealer, speaker connection failure and sound during operation of the speaker system There was a problem that it was impossible to detect an abnormality such as a malfunction that was not output.

The present invention has been made to solve the above-described problems, and it is an object of the present invention to diagnose an abnormality during operation of a speaker system in a state where a user cannot hear a diagnostic sound.

The speaker abnormality diagnosis device according to the present invention has a signal determination unit for determining an output level of a diagnostic signal in an audible band, and a noise level in the vehicle is higher than an output level of the diagnosis signal determined by the signal determination unit. Timing determination unit for determining timing, signal generation unit for outputting a diagnostic signal from a speaker in the vehicle at the timing determined by the timing determination unit, and impedance calculation for calculating impedance when the speaker outputs the diagnostic signal A resonance frequency calculation unit that calculates a resonance frequency when the speaker outputs a diagnostic signal, and an abnormality diagnosis unit that diagnoses an abnormality of the speaker using calculation results of the impedance calculation unit and the resonance frequency calculation unit Is.

According to the present invention, the diagnosis sound is output from the speaker at the timing when the noise in the vehicle becomes larger than the diagnosis sound, and the abnormality of the speaker is diagnosed using the impedance and the resonance frequency at that time. Abnormalities can be diagnosed during operation of the speaker system in a state in which no diagnostic sound is heard.

It is a block diagram which shows the structural example of the abnormality diagnosis apparatus of the speaker which concerns on Embodiment 1 of this invention. It is a figure which shows the hardware structural example of the abnormality diagnosis apparatus of the speaker which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the structural example of the speaker in Embodiment 1 of this invention. It is a graph which shows the relationship between the frequency and impedance of a speaker in Embodiment 1 of this invention. It is a flowchart which shows the operation example of the abnormality diagnosis apparatus of the speaker which concerns on Embodiment 1 of this invention. It is a flowchart which shows another example of an operation | movement of the abnormality diagnosis apparatus of the speaker which concerns on Embodiment 1 of this invention. It is a flowchart which shows another example of an operation | movement of the abnormality diagnosis apparatus of the speaker which concerns on Embodiment 1 of this invention.

Hereinafter, in order to explain the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration example of an abnormality diagnosis apparatus 1 according to Embodiment 1 of the present invention.
The abnormality diagnosis apparatus 1 includes a battery voltage acquisition unit 1-1, a vehicle information acquisition unit 1-2, a timing determination unit 1-3, a signal determination unit 1-4, an impedance calculation unit 1-5, and a resonance frequency calculation unit 1-6. , An abnormality diagnosis unit 1-7, a memory unit 1-8, and a signal generation unit 2. The signal generation unit 2 includes a frequency adjustment unit 2-1 and an output level adjustment unit 2-2. Further, the abnormality diagnosis apparatus 1 is connected to the amplifier unit 3 and the notification unit 5. A speaker 4 is connected to the amplifier unit 3. The amplifier unit 3 and the speaker 4 constitute a speaker system.

FIG. 2 is a block diagram showing a hardware configuration example of the abnormality diagnosis apparatus 1 according to Embodiment 1 of the present invention.
Battery voltage acquisition unit 1-1, vehicle information acquisition unit 1-2, timing determination unit 1-3, signal determination unit 1-4, impedance calculation unit 1-5, resonance frequency calculation unit 1-6 in abnormality diagnosis apparatus 1, Each function of the abnormality diagnosis unit 1-7 and the signal generation unit 2 is realized by a processing circuit. That is, the abnormality diagnosis apparatus 1 includes a processing circuit for realizing the above functions. In the configuration example of FIG. 2, the processing circuit is a processor 10 that executes a program stored in the memory 11 and a DSP (Digital Signal Processor) 12. The processor 10 includes a battery voltage acquisition unit 1-1, a vehicle information acquisition unit 1-2, a timing determination unit 1-3, a signal determination unit 1-4, an impedance calculation unit 1-5, a resonance frequency calculation unit 1-6, and an abnormality. Each function of the diagnosis unit 1-7 is realized. The DSP 12 implements the function of the signal generator 2.

When the processing circuits are the processor 10 and the DSP 12, the battery voltage acquisition unit 1-1, the vehicle information acquisition unit 1-2, the timing determination unit 1-3, the signal determination unit 1-4, the impedance calculation unit 1-5, the resonance frequency The functions of the calculation unit 1-6, the abnormality diagnosis unit 1-7, and the signal generation unit 2 are realized by software, firmware, or a combination of software and firmware. Software or firmware is described as a program and stored in the memory 11. The processor 10 and the DSP 12 implement the functions of each unit by reading and executing the program stored in the memory 11. That is, the abnormality diagnosis apparatus 1 has a memory 11 for storing a program that, when executed by the processor 10 and the DSP 12, results in the steps shown in the flowcharts of FIGS. Is provided. The program includes a battery voltage acquisition unit 1-1, a vehicle information acquisition unit 1-2, a timing determination unit 1-3, a signal determination unit 1-4, an impedance calculation unit 1-5, and a resonance frequency calculation unit 1-6. It can also be said that the computer executes the procedures or methods of the abnormality diagnosis unit 1-7 and the signal generation unit 2.

Here, the processor 10 refers to a CPU (Central Processing Unit), a processing device, an arithmetic device, a microprocessor, a microcomputer, or the like.
The memory 11 may be a RAM (Random Access Memory), a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), or a nonvolatile or volatile semiconductor memory such as a flash memory, a hard disk, a flexible disk, or the like. The magnetic disk may be an optical disk such as a CD (Compact Disc) or a DVD (Digital Versatile Disc).

The memory unit 1-8 in the abnormality diagnosis apparatus 1 is the memory 11. The amplifier unit 3 in the abnormality diagnosis apparatus 1 is an amplifier 13. The speaker 4 in the abnormality diagnosis apparatus 1 is a speaker 14. The notification unit 5 in the abnormality diagnosis apparatus 1 is a display 15.

FIG. 3 is a cross-sectional view showing a structural example of the speaker 4 according to Embodiment 1 of the present invention.
The speaker 4 includes a frame 4-1, a magnet 4-2, a diaphragm 4-3, a voice coil 4-4, and a damper 4-5. The magnet 4-2 is fixed to the frame 4-1. The diaphragm 4-3 and the voice coil 4-4 are fixed to the frame 4-1 via the damper 4-5, and are in a state capable of vibrating. The audio signal or the diagnostic signal amplified by the amplifier circuit 3-2 of the amplifier unit 3 flows from the normal phase output terminal 3-3 and the reverse phase output terminal 3-4 to the voice coil 4-4, and the diaphragm 4-3 Is output as a voice or diagnostic sound.
In addition, the structure of the speaker 4 is not limited to the example of FIG.

FIG. 4 is a graph showing the relationship between the frequency and impedance of the speaker 4 according to Embodiment 1 of the present invention.
The arrow indicates the resonance frequency when the speaker 4 is normal. When an abnormality occurs in the speaker 4, a difference appears in the impedance characteristics near the resonance frequency. By performing the impedance measurement near the resonance frequency, the abnormality of the speaker 4 can be diagnosed. For example, when an abnormality occurs in the vibration of the vibration plate 4-3 due to the wetness of the vibration plate 4-3 or physical interference, the impedance becomes lower than that in the normal state as in the case of abnormality A. Further, when the diaphragm 4-3 is broken, the resonance frequency becomes lower than that in the normal state as in the case of abnormality B. Further, when the magnet 4-2 is dropped, like the abnormality C, the impedance becomes lower than that in the normal state, and the frequency characteristic of the impedance at the resonance frequency becomes flat.

The battery voltage acquisition unit 1-1 acquires the value of the battery voltage mounted on the vehicle and outputs it to the timing determination unit 1-3.
The vehicle information acquisition unit 1-2 acquires the value of the engine speed for a gasoline vehicle and the value of the motor rotation for an electric vehicle, and outputs the value to the timing determination unit 1-3 as vehicle information. Further, the vehicle information acquisition unit 1-2 acquires the value of the vehicle speed and outputs it as vehicle information to the timing determination unit 1-3. The vehicle information acquisition unit 1-2 may acquire at least one of the engine speed, the motor speed, and the vehicle speed as the vehicle information and output it as the vehicle information.
The abnormality diagnosis device 1 may include both the battery voltage acquisition unit 1-1 and the vehicle information acquisition unit 1-2, or may include only one of them.

The timing determination unit 1-3 receives the value of the battery voltage or vehicle information from the battery voltage acquisition unit 1-1 or the vehicle information acquisition unit 1-2, estimates the noise level in the vehicle, and obtains information on the estimated noise level. The signal is output to the signal determination unit 1-4. The timing determination unit 1-3 receives information on the output level of the diagnostic signal determined by the signal determination unit 1-4.
The timing determination unit 1-3 compares the estimated noise level in the vehicle with the level of the diagnostic sound when the diagnostic signal is output from the speaker 4 at the output level determined by the signal determination unit 1-4. To do. Then, the timing determination unit 1-3 determines a timing at which the estimated noise level in the vehicle is large and the diagnostic sound output from the speaker 4 will be masked, and notifies the signal generation unit 2 of the determined timing.

The signal determination unit 1-4 reads the past diagnosis result stored in the memory unit 1-8. The past diagnosis results include the diagnosis result of abnormality or normality by the abnormality diagnosis unit 1-7, the resonance frequency calculated by the resonance frequency calculation unit 1-6, and the resonance frequency calculated by the impedance calculation unit 1-5. Each impedance at a nearby frequency is included.

The signal determination unit 1-4 determines the frequency and output level of the diagnostic signal using information on the resonance frequency and impedance included in the past diagnosis result. The signal determination unit 1-4 outputs the determined frequency and output level information of the diagnostic signal to the timing determination unit 1-3, the impedance calculation unit 1-5, the resonance frequency calculation unit 1-6, and the signal generation unit 2. .

When the impedance is high, current does not flow easily. Therefore, even if diagnostic signals having the same output level are output from the speaker 4, the current flowing to the speaker 4 is smaller when the impedance is higher than when the impedance is low. If the current becomes too small, the detection accuracy of the current detection circuit 3-1 deteriorates. Therefore, it is better to diagnose with the loudest possible volume. However, if the diagnosis is performed at a large volume, the user will notice the diagnosis sound. For this reason, the signal determination unit 1-4 determines the output level of the diagnostic signal in comparison with the noise level in order to make a diagnosis at a volume at which the diagnostic sound is masked by the noise around the user. Further, the signal determination unit 1-4 may determine the magnitude of the output level of the diagnostic signal based on the level of the impedance included in the past diagnosis result.
In addition, when an abnormality occurs such that the movement of the diaphragm 4-3 is suppressed, the diaphragm 4-3 is damaged, or the diaphragm 4-3 is detached from the frame 4-1, the resonance frequency and its resonance frequency are detected. This affects the impedance. Therefore, the signal determination unit 1-4 determines the frequency of the diagnostic signal based on the resonance frequency included in the diagnosis result. In order to confirm whether there is a change from the previously calculated resonance frequency, the signal determination unit 1-4, for example, has three frequencies: a resonance frequency included in the diagnosis result, this resonance frequency +100 Hz, and this resonance frequency −100 Hz. Is determined as the frequency of the diagnostic signal. The frequency of the diagnostic signal is an audible band.

The impedance calculation unit 1-5 receives the information of the output level of the diagnostic signal from the signal determination unit 1-4, and the potential difference between the normal phase output terminal 3-3 and the negative phase output terminal 3-4, that is, to the speaker 4 Calculate the output level. The impedance calculation unit 1-5 receives the current value detected by the current detection circuit 3-1. Then, the impedance calculation unit 1-5 calculates the impedance at each frequency of the diagnostic signal using the potential difference and the current value between the positive phase output terminal 3-3 and the negative phase output terminal 3-4, The calculated impedance information is output to the resonance frequency calculator 1-6.

The resonance frequency calculation unit 1-6 receives the frequency information of the diagnostic signal from the signal determination unit 1-4 and receives the impedance information from the impedance calculation unit 1-5. Then, the resonance frequency calculation unit 1-6 calculates the resonance frequency of the speaker 4 using the frequency and impedance of the diagnostic signal, and abnormally diagnoses the impedance information at each frequency of the calculated resonance frequency and diagnostic signal. Output to unit 1-7.

The abnormality diagnosis unit 1-7 receives the impedance information at the resonance frequency and each frequency of the diagnostic signal from the resonance frequency calculation unit 1-6. The abnormality diagnosis unit 1-7 reads past diagnosis results stored in the memory unit 1-8. Then, the abnormality diagnosis unit 1-7 compares the resonance frequency and impedance included in the past diagnosis result with the current resonance frequency and impedance received from the resonance frequency calculation unit 1-6, and a difference value is determined in advance. If it is equal to or greater than the threshold value, it is diagnosed as abnormal, and if it is less than the threshold value, normal is diagnosed. Further, when the abnormality diagnosis unit 1-7 diagnoses an abnormality, the abnormality diagnosis unit 1-7 determines which of the abnormalities A to C shown in FIG. 4 corresponds to the abnormality based on the resonance frequency and impedance, and causes the abnormality. May be estimated.
The abnormality diagnosing unit 1-7 outputs the diagnosis result of whether the speaker 4 is abnormal or normal, the resonance frequency, and the impedance information to the memory unit 1-8 for storage. Note that the abnormality diagnosis unit 1-7 may also output and store information on the cause of the estimated abnormality to the memory unit 1-8.
Further, when the abnormality diagnosis unit 1-7 diagnoses that an abnormality has occurred in the speaker 4, the abnormality diagnosis unit 1-7 notifies the notification unit 5 to that effect. The abnormality diagnosis unit 1-7 may output information indicating the estimated cause of the abnormality to the notification unit 5.

The memory unit 1-8 receives and stores the diagnosis result from the abnormality diagnosis unit 1-7. The memory unit 1-8 may store an impedance and a resonance frequency for each time, or may store a moving average value of impedance and resonance frequency for the past 10 times. The impedance and the resonance frequency stored in the memory unit 1-8 are used for determination of the frequency and output level of the next diagnostic signal and a reference for abnormality diagnosis.

The signal generating unit 2 includes a frequency adjusting unit 2-1 for adjusting the frequency of the diagnostic signal and an output level adjusting unit 2-2 for adjusting the output level of the diagnostic signal. The signal generation unit 2 receives the frequency and output level information of the diagnostic signal from the signal determination unit 1-4. When the signal generation unit 2 receives a notification for instructing the diagnosis signal output from the timing determination unit 1-3, the signal generation unit 2 outputs the diagnosis signal to the amplifier circuit 3-2. When the diagnostic signal is output, the frequency adjustment unit 2-1 adjusts the frequency of the diagnostic signal so as to be the frequency received from the signal determination unit 1-4, and the output level adjustment unit 2-2 includes the signal determination unit 1 -4 adjust the output level of the diagnostic signal so as to be the output level received from -4.

The amplifier unit 3 includes an amplifier circuit 3-2 for driving the speaker 4 and a current detection circuit 3-1 for detecting a current value flowing through the speaker 4. The amplifier circuit 3-2 of the amplifier unit 3 and the voice coil 4-4 of the speaker 4 are connected via a normal phase output terminal 3-3 and a negative phase output terminal 3-4.

When the notification unit 5 receives a notification from the abnormality diagnosis unit 1-7 that an abnormality has occurred in the speaker 4, the notification unit 5 notifies the user. For example, the notification unit 5 displays a notification on the display 15 illustrated in FIG. When a speaker other than the speaker 4 is mounted in the vehicle, the notification unit 5 may output a notification from the speaker.

FIG. 5 is a flowchart showing an operation example of the abnormality diagnosis apparatus 1 according to Embodiment 1 of the present invention.
In step ST1, the signal determination unit 1-4 determines the frequency of the diagnostic signal using the resonance frequency included in the past diagnosis result stored in the memory unit 1-8.

In step ST2, the signal determination unit 1-4 determines the output level V1 of the diagnostic signal by using the impedance included in the past diagnosis result stored in the memory unit 1-8. This output level V1 is an output level necessary for abnormality diagnosis of the speaker 4, and is determined according to the past impedance.

In step ST3, the timing determination unit 1-3 uses at least one of the value of the battery voltage or the vehicle information received from the battery voltage acquisition unit 1-1 or the vehicle information acquisition unit 1-2. Estimate the noise level.
For example, when the amount of decrease in battery voltage per unit time is equal to or greater than a predetermined value, the timing determination unit 1-3 determines that engine starting is being cranked, and the inside of the vehicle being cranked Estimate the noise level. It is assumed that the noise level in the vehicle during cranking is set in advance in the timing determination unit 1-3.
For example, the timing determination unit 1-3 estimates the noise level in the vehicle based on the engine speed, the motor speed, or the vehicle speed. It is assumed that the relationship between the engine speed, the motor speed, or the vehicle speed and the noise level in the vehicle is set in advance in the timing determination unit 1-3. The timing determination unit 1-3 may estimate the engine speed based on the ripple noise frequency of the battery voltage.

In step ST4, the signal determination unit 1-4 determines an output level V2 that produces a volume corresponding to the noise in the vehicle when output from the speaker 4 based on the noise level received from the timing determination unit 1-3. To do.

In step ST5, the timing determination unit 1-3 compares the output levels V1 and V2 determined by the signal determination unit 1-4. When the output level V1 <the output level V2, that is, when the diagnosis sound is masked by the noise in the vehicle (step ST6 “YES”), the timing determination unit 1-3 proceeds to step ST6. On the other hand, when the output level V1 ≧ the output level V2, that is, when the noise in the vehicle is the same as the diagnosis sound, or the diagnosis sound is larger than the noise (step ST6 “NO”), the process returns to step ST3.

In step ST6, the timing determination unit 1-3 instructs the signal generation unit 2 to output a diagnostic sound signal at the frequency determined in step ST1 and the output level V1 determined in step ST2. As a result, a diagnostic signal is output from the signal generating unit 2 to the speaker 4 via the amplifier unit 3, and a diagnostic sound is output from the speaker 4.

In step ST7, the impedance calculation unit 1-5 uses the output level of the diagnostic signal received from the signal determination unit 1-4 and the current value detected by the current detection circuit 3-1 during the output of the diagnostic sound to perform diagnosis. Calculate the impedance of the signal for each frequency.

In step ST8, the resonance frequency calculation unit 1-6 calculates the resonance frequency using the frequency of the diagnostic signal received from the signal determination unit 1-4 and the impedance calculated by the impedance calculation unit 1-5.

In step ST9, the abnormality diagnosis unit 1-7 performs abnormality diagnosis of the speaker 4 using the impedance calculated by the impedance calculation unit 1-5 and the resonance frequency calculated by the resonance frequency calculation unit 1-6. .

In the flowchart of FIG. 5, the signal determination unit 1-4 determines the output level V1 of the diagnostic signal based on the past impedance. However, the present invention is not limited to this, and based on the estimated noise level. The output level V1 may be an output level that produces a loud volume that does not exceed the noise level.

Next, two examples of an abnormality diagnosis method that is simpler than the abnormality diagnosis method shown in the flowchart of FIG. 5 will be described with reference to FIGS.

FIG. 6 is a flowchart showing another operation example of the abnormality diagnosis apparatus 1 according to Embodiment 1 of the present invention. The processes in steps ST1 and ST2 in FIG. 6 are the same as the processes in steps ST1 and ST2 in FIG.
In step ST11, the timing determination unit 1-3 uses the value of the battery voltage received from the battery voltage acquisition unit 1-1, and determines whether or not the amount of decrease in the battery voltage per unit time is equal to or greater than a predetermined value. Determine whether. If the amount of decrease in battery voltage per unit time is greater than or equal to a predetermined value (step ST11 “YES”), the timing determination unit 1-3 proceeds to step ST12. On the other hand, when the decrease amount per unit time of the battery voltage is less than a predetermined value (step ST11 “NO”), the timing determination unit 1-3 proceeds to step ST13.

In step ST12, the timing determination unit 1-3 determines that the battery voltage temporarily dropped significantly due to engine start cranking. Then, the timing determination unit 1-3 estimates that the noise level in the vehicle is higher than the output level V1 due to the cranking sound, and proceeds to step ST6 in FIG.

In step ST13, the timing determination unit 1-3 determines whether the ripple noise frequency of the battery voltage received from the battery voltage acquisition unit 1-1 is equal to or higher than a predetermined value. When the ripple noise frequency is equal to or higher than a predetermined value (step ST13 “YES”), the timing determination unit 1-3 proceeds to step ST14. On the other hand, when the frequency of the ripple noise is less than a predetermined value (step ST13 “NO”), the timing determination unit 1-3 ends the process without performing the abnormality diagnosis of the speaker 4.

In step ST14, the timing determination unit 1-3 determines that the engine speed is high. Then, the timing determination unit 1-3 estimates that the noise level in the vehicle is higher than the output level V1 due to the engine sound, and proceeds to step ST6 in FIG.

FIG. 7 is a flowchart showing another operation example of the abnormality diagnosis apparatus 1 according to Embodiment 1 of the present invention. The processing in steps ST1 and ST2 in FIG. 7 is the same as the processing in steps ST1 and ST2 in FIG.
In step ST21, the timing determination unit 1-3 uses the information on the engine speed or the motor speed received from the vehicle information acquisition unit 1-2, and the engine speed or the motor speed is equal to or greater than a predetermined value. Determine whether or not. When the engine speed or the motor speed is equal to or higher than a predetermined value (step ST21 “YES”), the timing determination unit 1-3 causes the noise level in the vehicle to be greater than the output level V1 due to the engine sound or the motor sound. The process proceeds to step ST6 in FIG. On the other hand, when the engine speed or the motor speed is less than a predetermined value (step ST21 “NO”), the timing determination unit 1-3 proceeds to step ST22.

In step ST22, the timing determination unit 1-3 uses the vehicle speed information received from the vehicle information acquisition unit 1-2 to determine whether the vehicle speed is equal to or higher than a predetermined value. When the vehicle speed is equal to or higher than a predetermined value (step ST22 “YES”), the timing determination unit 1-3 estimates that the noise level in the vehicle is higher than the output level V1 due to the running sound, and FIG. The process proceeds to step ST6. On the other hand, when the vehicle speed is less than a predetermined value (step ST22 “NO”), the timing determination unit 1-3 ends the process without performing the abnormality diagnosis of the speaker 4.

The abnormality diagnosis apparatus 1 repeatedly performs the flowchart shown in FIG. 5, FIG. 6 or FIG. 7 during the operation of the speaker 4. Thereby, when an abnormality occurs during the operation of the speaker 4, the abnormality can be immediately diagnosed and notified to the user.

As described above, the abnormality diagnosis apparatus 1 according to Embodiment 1 includes the signal determination unit 1-4 that determines the output level of the diagnostic signal in the audible band, and the noise level in the vehicle is determined by the signal determination unit 1-4. Timing determination unit 1-3 for determining timing that is greater than the determined output level of the diagnostic signal, and signal generation for outputting the diagnostic signal from speaker 4 in the vehicle at the timing determined by timing determination unit 1-3 Unit 2, impedance calculation unit 1-5 for calculating impedance when speaker 4 outputs a diagnostic signal, and resonance frequency calculation unit 1-6 for calculating resonance frequency when speaker 4 outputs a diagnostic signal And an abnormality diagnosing unit 1-7 for diagnosing an abnormality of the speaker 4 using the calculation results of the impedance calculating unit 1-5 and the resonance frequency calculating unit 1-6. . Since the diagnosis sound is output from the speaker 4 at a timing when the noise in the vehicle becomes larger than the diagnosis sound, and the abnormality of the speaker 4 is diagnosed using the impedance and the resonance frequency at that time, the user cannot hear the diagnosis sound. An abnormality can be diagnosed during operation of the speaker system. Thereby, for example, when an abnormality occurs in the speaker 4 during traveling of the vehicle, the abnormality can be diagnosed immediately.

Further, according to the first embodiment, the timing determination unit 1-3 is based on at least one of the voltage of the battery mounted on the vehicle, the engine speed, the motor speed, or the vehicle speed. This is a configuration for estimating the noise level. Thereby, the noise level in the vehicle can be estimated without requiring an additional device such as a microphone.

Further, according to the first embodiment, the abnormality diagnosis unit 1-7 is configured to estimate the cause of the abnormality of the speaker 4 using the calculation results of the impedance calculation unit 1-5 and the resonance frequency calculation unit 1-6. There may be. As a result, the vibration of the vibration plate 4-3 due to water wetting or physical interference (abnormality A), the vibration abnormality of the vibration plate 4-3 (abnormality B), and the magnet 4-2 dropping off abnormality. (Abnormality C) can be identified.

In addition, in the example of FIG. 1, the configuration is such that one speaker 4 is connected to the amplifier unit 3, but a configuration in which a plurality of speakers 4 are connected in parallel may be used. Further, even if the plurality of speakers 4 are a normal speaker, a woofer, a tweeter, and the like, and a coupling capacitor is inserted in order to separate frequencies from each speaker 4, Embodiment 1 Since the diagnostic signal used in is an alternating current and is not cut by the coupling capacitor, an abnormality diagnosis can be performed.

In the present invention, any component of the embodiment can be modified or any component of the embodiment can be omitted within the scope of the invention.

The loudspeaker abnormality diagnosis apparatus according to the present invention uses the fact that the user does not notice even if the sound in the audible band for diagnosis is output when the noise in the vehicle is large. Since the abnormality diagnosis is performed by detecting a deaf case and outputting a sound in the audible band for diagnosis at that timing, it is suitable for use in a speaker abnormality diagnosis device for sounding a warning sound on the instrument panel. ing.

1 abnormal diagnosis device, 1-1 battery voltage acquisition unit, 1-2 vehicle information acquisition unit, 1-3 timing determination unit, 1-4 signal determination unit, 1-5 impedance calculation unit, 1-6 resonance frequency calculation unit, 1-7 abnormality diagnosis unit, 1-8 memory unit, 2 signal generation unit, 2-1, frequency adjustment unit, 2-2 output level adjustment unit, 3 amplifier unit, 3-1, current detection circuit, 3-2 amplification circuit, 3-3 Normal phase output terminal, 3-4 Reverse phase output terminal, 4 Speaker, 4-1, Frame, 4-2 Magnet, 4-3 Diaphragm, 4-4 Voice coil, 4-5 Damper, 5 Notification unit, 10 processors, 11 memories, 12 DSP, 13 amplifiers, 14 speakers, 15 displays.

Claims

A signal determining unit for determining the output level of the diagnostic signal in the audible band;
A timing determining unit for determining a timing at which a noise level in the vehicle becomes larger than an output level of the diagnostic signal determined by the signal determining unit;
A signal generator for outputting the diagnostic signal from a speaker in the vehicle at the timing determined by the timing determination unit;
An impedance calculator for calculating an impedance when the speaker outputs the diagnostic signal;
A resonance frequency calculator for calculating a resonance frequency when the speaker outputs the diagnostic signal;
A speaker abnormality diagnosis device comprising: an abnormality diagnosis unit that diagnoses abnormality of the speaker using calculation results of the impedance calculation unit and the resonance frequency calculation unit.
The timing determination unit estimates a noise level in the vehicle based on at least one of a voltage of a battery mounted on the vehicle, an engine speed, a motor speed, or a vehicle speed. The abnormality diagnosis device for a speaker according to claim 1.
The speaker abnormality diagnosis device according to claim 1, wherein the abnormality diagnosis unit estimates a cause of the abnormality of the speaker using calculation results of the impedance calculation unit and the resonance frequency calculation unit.
A signal determining unit determining an output level of an audible band diagnostic signal;
A timing determining unit determining a timing at which a noise level in the vehicle becomes larger than an output level of the diagnostic signal determined by the signal determining unit;
A step of causing the signal generation unit to output the diagnostic signal from a speaker in the vehicle at the timing determined by the timing determination unit;
An impedance calculator that calculates an impedance when the speaker outputs the diagnostic signal; and
A step of calculating a resonance frequency when the speaker outputs the diagnostic signal;
A method for diagnosing a speaker abnormality, comprising: a step of diagnosing abnormality of the speaker using a calculation result of the impedance calculation unit and the resonance frequency calculation unit.