JPH0876769A - Abnormality detection device and abnormality detection method for active silencer - Google Patents

Abstract

(57) [Summary] [Object] To provide an abnormality detection device and an abnormality detection method for an active silencer capable of realizing highly reliable abnormality detection by simple control. An addition circuit 11 for adding a predetermined number of times the output signal 10 of the active silencer 9 is compared with the added value and a reference value on the addition value memory 12 to make an addition value abnormal under a predetermined condition. The addition value abnormality detection device 22 having the addition value comparison / determination circuit 13 that outputs the signal 14 is compared with the output signal 10 of the active silencer 9 and the reference value on the reference value memory 15,
Continuous abnormality having a reference value comparison / determination circuit 16 that outputs an abnormal signal 17 under a predetermined condition, and a counter 18 that outputs a continuous abnormal signal 19 when the abnormal signal 17 is continuously output a predetermined number of times. Abnormality detection of an active silencer, comprising a detection device 23 and a determination circuit 20 that outputs a signal indicating device abnormality when the addition value abnormality signal 14 and the continuous abnormality signal 19 are simultaneously output. apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anomaly detection apparatus and an anomaly detection method suitable for being applied to an active noise canceling apparatus for eliminating noise generated from a fan used in, for example, an air-cooling apparatus, and particularly to a single external TECHNICAL FIELD The present invention relates to an abnormality detection device and an abnormality detection method for an active silencer capable of preventing malfunction due to static noise by adding a simple configuration.

[0002]

2. Description of the Related Art Conventionally, active control has been considered as one of control methods for a noise canceling device for canceling noise generated from a cooling fan mounted inside an information processing device or the like.
This is a technique in which a sound having a phase opposite to that of a sound generated from a target sound source and having the same amplitude is produced, and the sound is canceled by superimposing the sound on the sound generated from the sound source.

The canceling sound is input to a digital filter after changing an output signal of a sensor for detecting a sound generated from a sound source in a blower path, for example, and returning the filter output to an analog signal to drive a speaker. Is generated by

According to this method, the sound does not proceed beyond the point where the sound generated from the sound source and the canceling sound are superposed (the sound deadening point), and the sound deadening point becomes a sound wall in the air duct. The sound is trapped in.

FIG. 2 is a diagram showing the basic construction of an active noise canceling device attached to an information processing device or the like, in which a fan 1 is used as a sound source, and noise leaking from the sound source to the outside through an air passage 2 and an opening 3 is silenced. It is a device. A sound source detection sensor 4 for detecting a sound generated from a sound source is provided in the air passage 2, and a speaker 8 for generating a canceling sound is provided near the sound deadening point (usually the opening 3). There is. The output signal from the sound source detection sensor 4 is A / D (analog / digital)
The digital filter 6 is converted into an output signal through the converter 5.
Is input to

The digital filter 6 generates a generated sound drive signal from a sound source at a sound deadening point where the speaker 8 is placed,
It is supplied to the speaker 8 through the D / A (digital / analog) converter 7.

In this way, the canceling sound generated from the speaker 8 is superimposed on the noise at the sound deadening point, thereby canceling the noise. That is, since the sound pressure is zero due to the cancellation sound being superposed at the sound deadening point, the noise is trapped in the air passage 2 and is not transmitted to the outside from the sound deadening point.

Further, the abnormality detection of the active silencer using the noise signal detected by the sound source detection sensor 4 means that the noise detected by the sound source detection sensor 4 is periodically generated when the active silencer operates normally. Change to a signal corresponding to the magnitude of, and store the value added or averaged as a reference value according to the preset number of samplings, and then successively compare the value obtained by the same method and the reference value. Is to detect an abnormality of the active silencer.

The above-described addition value abnormality detecting device will be described with reference to FIG. When the fan 3 is operating normally, the noise detected by the sound source detection sensor 4 at regular intervals for the purpose of performing active noise reduction control passes through the A / D converter 5 and outputs the output signal 1
It is converted to 0, output from the active muffling device 9 and input to the added value abnormality detecting device 22.

The addition value abnormality detection device 22 includes an addition circuit 11
And an added value memory 12 and an added value comparison / determination circuit 13. The output signal 10 output from the active silencer 9 is
It is input to the addition circuit 11 of the addition value abnormality detection device 22, and the addition circuit 11 adds the output signal 10 the preset number of times, and then sends the result to the addition value memory 12. Then, the added value memory 12 stores it and uses it as a reference value.

After that, the adder circuit 11 repeatedly adds the output signal 10 the number of times set in advance, and sends the addition result at the time when the set number of times has ended to the added value comparison / determination circuit 13. The added value comparison / determination circuit 13 compares the value with the reference value previously stored in the added value memory 12,
It is determined whether the result is within a preset allowable range.

If it is out of the range, the added value comparison / determination circuit 13 sends the added value abnormality signal 14 to the information processing device controller 21. That is, the additional value abnormality detection device 22
Determines whether there is an abnormality in the total value of the output signals 10 for a predetermined period, and if there is an abnormality, sends an abnormality signal of the active silencer 9 to the information processing device controller 21.

[0013]

As described above, the abnormality detection of the conventional active silencer is performed by using the added value or the average value of the noises generated within the predetermined time. Therefore, for a relatively loud sound such as an impact sound or noise from the outside, it may be mistakenly considered to be an abnormality in the active silencer itself, though it is a single occurrence, and may malfunction. There was a problem that there was a property.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an abnormality detection device and an abnormality detection method for an active silencer capable of realizing highly reliable abnormality detection with simple control.

[0015]

DISCLOSURE OF THE INVENTION The present invention provides an abnormality detection device for an active silencer, which eliminates noise generated by driving a fan by generating a predetermined canceling noise and superimposing the noise to detect the abnormality. An addition circuit that adds the quantized fan noise value a preset number of times;
The value output by the adder circuit is compared with a preset reference value to determine whether the output value is within the allowable range, and the output value is not within the allowable range. When the determination is made, a first abnormality detection device having an addition value comparison / determination circuit that outputs a first abnormality signal, and a fan noise value detected and quantized by the active noise suppressor and a preset reference value By comparing with the value, to determine whether the noise value is within the allowable range, a reference value comparison determination circuit that outputs a signal when it is determined that the noise value is not within the allowable range,
A second abnormality detection device having a counter that outputs a second abnormality signal when the reference value comparison / determination circuit continuously outputs a signal over a preset number of times. Is characterized by.

Further, the present invention is characterized by comprising a determination circuit for outputting a signal indicating an abnormality of the device when the first and second abnormality signals are simultaneously output. Further, the present invention is characterized in that the value output by the adding circuit is an average value of the noise values calculated from the added values.

Further, the present invention provides a method for detecting an abnormality of an active silencer, which eliminates noise generated by driving a fan by generating a predetermined canceling noise and superimposing the noise.
The noise value of the fan detected and quantized by the active noise suppressor is added for a preset number of times, the added value is compared with a preset reference value, and the added value falls within an allowable range. When it is determined that the added value is not within the allowable range, the first abnormality is recognized, and the noise value of the fan detected and quantized by the active silencer and the noise value of the fan are detected in advance. By comparing with the set reference value, it was determined whether the noise signal was within the allowable range, and it was determined that the noise signal was not within the allowable range continuously over the preset number of times. Sometimes, the second abnormality is recognized, and when the first and second abnormalities are simultaneously recognized, it is recognized as an apparatus abnormality.

Further, the present invention provides a method for detecting an abnormality of an active silencer, which eliminates noise generated by driving a fan by generating a predetermined canceling noise and superimposing the noise.
The active silencer detects and quantizes the noise value of the quantized fan for a preset number of times, and compares the average value of the noise value calculated from the added value with a preset reference value, When it is determined whether this average value is within the allowable range, and when it is determined that this average value is not within the allowable range,
The first abnormality is recognized, and the noise value of the fan detected and quantized by the active noise suppressor is compared with a preset reference value to determine whether the noise value is within an allowable range. When it is determined that the noise value is not within the allowable range continuously over a preset number of times, the second abnormality is recognized, and the first and second abnormality are simultaneously recognized. When
The feature is that it is recognized as a device abnormality.

[0019]

According to the abnormality detecting apparatus of the present invention, in the first abnormality detecting apparatus, the adding circuit first adds the noise value of the fan detected and quantized by the active noise suppressor for a preset number of times. Then, the addition value comparison determination circuit compares the addition value added by this addition circuit or the average value of the noise value calculated from this addition value with a preset reference value, and this addition value or average value Is within the allowable range. Here, when it is determined that the added value or the average value is not within the allowable range, the added value comparison / determination circuit determines
The abnormal signal of is output.

In the second abnormality detecting device, the reference value comparison / determination circuit compares the noise value of the fan detected and quantized by the active silencer with a preset reference value, and the noise value is compared. Is within the allowable range.
When it is determined that the noise value is not within the allowable range, the reference value comparison / determination circuit outputs a signal to the counter.
Then, the counter outputs the second abnormal signal when the signal is continuously received over the preset number of times.

The determination circuit inputs the first and second abnormal signals and outputs a signal indicating an abnormality of the active silencer when the first and second abnormal signals are simultaneously input. As a result, it is possible to prevent a malfunction due to a single noise from the outside, and it is possible to perform highly reliable abnormality detection.

According to the abnormality detecting method of the present invention, first, the noise value of the fan detected and quantized by the active noise suppressor is added a preset number of times, and the added value or the added value is added. From the average value of the noise value calculated from
It is determined whether or not this added value or average value is within the allowable range by comparing with a preset reference value, and when it is determined that this added value or average value is not within the allowable range, the first Recognize abnormalities.

At the same time, the noise value of the fan detected and quantized by the active silencer is compared with a preset reference value to determine whether or not this noise value is within an allowable range. The second abnormality is recognized when it is determined that the noise value is not within the allowable range continuously over the set number of times.

When the above-mentioned first and second abnormalities are recognized at the same time, it is recognized that an abnormal state has occurred in the active silencer, whereby malfunctions due to a sporadic noise from the outside can be prevented, It is possible to perform highly reliable abnormality detection.

[0025]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an abnormality detecting device for an active silencer according to the embodiment. As shown in FIG. 1, the abnormality detection device for the active silencer according to the embodiment includes a sound source detection sensor 4, an A / D converter 5, a digital filter 6, a D / A converter 7, and a cancellation sound speaker 8. And the active muffling device 9 that eliminates the noise generated by the fan 1 by the above-described operation.
3 and the determination circuit 20, the information processing controller 21 is notified when an abnormality of the active silencer 9 is detected.

The addition value abnormality detection device 22 includes an addition circuit 1
1. The addition value memory 12 and the addition value comparison / determination circuit 13 are added. The addition circuit 11 adds the output signal 10 from the active silencer 9 a predetermined number of times for each predetermined period, and the result is added value memory 12 (rise). (Only during normal operation), and the added value comparison / determination circuit 13. The addition value memory 12 stores the value transmitted from the addition circuit 11, and the addition value comparison / determination circuit 13 compares the value output from the addition circuit 11 with the value stored in the addition value memory 12. If the value output from the adder circuit 11 is out of the allowable range by this comparison, the adder value abnormality signal 14 is output to the determination circuit 20.

The continuous abnormality detecting device 23 includes a reference value memory 15, a reference value comparison / determination circuit 16, and a counter 18.
The reference value memory 15 stores the output signal 10 from the active silencer 9 only once when the normal operation is performed at the rising edge. Further, the reference value comparison / determination circuit 16 compares the output signal 10 from the active silencer 9 with the value stored in the reference value memory 15, and when the output signal 10 is outside the allowable range by this comparison. The abnormal signal 17 is output to the counter 18. The counter 18 is a counter that synchronizes with a predetermined cycle, and outputs a continuous abnormal signal 19 to the determination circuit 20 when the abnormal signal 17 is continuously counted a preset number of times.

Then, when the addition value abnormality signal 14 from the addition value abnormality detection device 22 and the continuous abnormality detection device 23 are simultaneously input, the judgment circuit 20 informs the information processing device controller 21 of the abnormality of the active silencer. Send the signal shown.

Upon receipt of this signal, the information processing device controller 21 displays an emergency stop, a warning message, etc.
Start the process when an error occurs. Next, with reference to FIG. 1, the operation of the abnormality detecting device for the active noise suppressor according to the embodiment will be described.

The active silencer 9 of FIG. 1 is exactly the same as the prior art, so it will not be described here. Further, as in the conventional case, the output signal 10 from the active muffling device 9 is input to the addition value abnormality detecting device 22.

And, the processing after this is different from the conventional one,
When the addition value abnormality detection device 22 detects an abnormality in the output signal 10, it does not immediately determine that an abnormality has occurred in the active silencer 9 at this point, and the addition value abnormality signal 14 is output to the determination circuit 2.
Send to 0.

The operation of the continuous abnormality detecting device 23 will be described below. The reference value memory 15 stores the output signal 10 output by the active silencer 9 at regular intervals only once when the active silencer 9 is normally operating (mainly at the time of rising). The content of the memory 15 is compared with the output signal 10 by the reference value comparison / determination circuit 16 at regular intervals.

The reference value comparison / determination circuit 16 outputs the output signal 10
And the value stored in the reference value memory 15 are compared, and when the value is outside the allowable range, the abnormal signal 17 is transmitted to the counter 18. The counter 18 is synchronized with a fixed cycle, and when the abnormal signal 17 is continuously counted a preset number of times, transmits a continuous abnormal signal 19 to the determination circuit 20.

That is, the continuous abnormality detecting device 23 receives the output signal 10 as an input, determines whether or not the output signal 10 is continuously abnormal according to a predetermined number of times set, and detects the abnormality continuously for the set number of times. Then, the continuous abnormality signal 19 is transmitted to the determination circuit 20.

When the addition value abnormality signal 14 and the continuous abnormality signal 19 are simultaneously input to the determination circuit 20, the determination circuit 20 sends a signal indicating the abnormality of the active silencer 9 to the information processing device controller 21. .

That is, the addition value abnormality signal 14 from the addition value abnormality detecting device 22 is output when an abnormality is detected with respect to the addition value or the average value of the output signal 10, and the continuous abnormality detecting device 23 is also provided. The continuous abnormal signal 19 from
It will be output when a continuous abnormality of the output signal 10 is detected, and by combining the settings of both,
It is possible to distinguish between a sporadic external noise and a continuous abnormal sound, and more reliable abnormality detection can be performed.

In this embodiment, the operation is based on the signal from the sound source detection sensor 4, but the present invention is not limited to this, and there is no problem even if it operates based on the output signal from the digital filter 6, for example. .

[0038]

As described in detail, according to the present invention, it is possible to prevent a malfunction due to a single noise from the outside simply by adding a simple structure to the conventional abnormality detecting device.
It is possible to realize highly reliable abnormality detection with simple control.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an abnormality detection device for an active silencer according to an embodiment of the present invention.

FIG. 2 is a diagram showing a basic configuration of an active silencer attached to an information processing device or the like.

FIG. 3 is a diagram for explaining an addition value abnormality detection device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fan, 2 ... Air flow path, 3 ... Opening part, 4 ... Sound source detection sensor, 5 ... A / D converter, 6 ... Digital filter, 7 ...
D / A converter, 8 ... Cancellation sound generation speaker, 9 ... Active silencer, 10 ... Output signal, 11 ... Addition circuit, 12 ...
Addition value memory, 13 ... Addition value comparison determination circuit, 14 ... Addition value abnormal signal, 15 ... Reference value memory, 16 ... Reference value comparison determination circuit, 17 ... Abnormal signal, 18 ... Counter, 19 ... Continuous abnormal signal, 20 ... Judgment circuit, 21 ... Information processing device controller, 22 ... Addition value abnormality detection device, 23 ... Continuous abnormality detection device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yutaka Aoki, 1381 Shinmachi, Ome-shi, Tokyo Within Toshiba Computer Engineering Co., Ltd. (72) Hiroshi Kuwahara 1381, Shinmachi, Ome-shi, Tokyo 1 Toshiba Computer Ta Engineering Co., Ltd. (72) Inventor Hiroshi Ikata 2-9, Suehiro-cho, Ome-shi, Tokyo Incorporated Toshiba Ome Factory

Claims (5)

[Claims] 1. An abnormality detection device for an active noise suppressor, which eliminates noise generated by driving a fan by generating a predetermined canceling noise and superimposing the noise, thereby detecting a noise value of the fan detected and quantized by the active noise suppressor. Is added for a preset number of times, and the value output by this adder circuit is compared with a preset reference value to determine whether the output value is within an allowable range. However, when it is determined that the output value is not within the allowable range, the first abnormality detection device having the addition value comparison / determination circuit that outputs the first abnormality signal and the active silencer detect the abnormality. When the noise value of the quantized fan is compared with a preset reference value to determine whether the noise value is within the allowable range, and when it is determined that the noise value is not within the allowable range. Reference value comparison format that outputs a signal A second abnormality detection device having a circuit and a counter that outputs a second abnormality signal when the reference value comparison / determination circuit continuously outputs a signal over a preset number of times. An abnormality detection device for an active silencer characterized by the following. 2. The active muffler according to claim 1, further comprising a determination circuit that outputs a signal indicating device abnormality when the first and second abnormality signals are simultaneously output. Abnormality detection device. 3. The abnormality detecting device for an active noise suppressor according to claim 1, wherein the value output by the adding circuit is an average value of the noise values calculated from the added values. 4. A noise level of a fan detected and quantized by the active noise suppressor in a method of detecting an abnormality of an active noise suppressor, which eliminates noise generated by driving a fan by generating a predetermined canceling noise and superimposing the noise. Is added a preset number of times, the added value is compared with a preset reference value, it is determined whether the added value is within an allowable range, and the added value is allowed. When it is determined that the noise is not within the range, the first abnormality is recognized, and the noise value of the fan detected and quantized by the active noise suppressor is compared with a preset reference value to obtain the noise value. Is within the allowable range, and when it is determined that the noise value is not within the allowable range continuously over a preset number of times, the second abnormality is recognized and the first abnormality is detected. And when the second abnormality is recognized at the same time, the device Abnormality detecting method for active noise reduction device and recognizes a normally. 5. A method for detecting an abnormality of an active noise suppressor, which eliminates noise generated by driving a fan by generating a predetermined canceling noise and superimposing the noise, thereby detecting a noise value of the fan detected and quantized by the active noise suppressor. Is added a preset number of times, and the average value of the noise values calculated from the added value is compared with a preset reference value to determine whether or not the average value is within an allowable range. However, when it is judged that this average value is not within the allowable range,
The first abnormality is recognized, and the noise value of the fan detected and quantized by the active noise suppressor is compared with a preset reference value to determine whether the noise value is within an allowable range. When it is determined that the noise value is not within the allowable range continuously over a preset number of times, the second abnormality is recognized, and the first and second abnormality are simultaneously recognized. When
A method for detecting an abnormality in an active silencer, which is characterized by recognizing an abnormality in the apparatus.