JPH058444U - Combustion noise measuring device - Google Patents
Combustion noise measuring deviceInfo
- Publication number
- JPH058444U JPH058444U JP5654291U JP5654291U JPH058444U JP H058444 U JPH058444 U JP H058444U JP 5654291 U JP5654291 U JP 5654291U JP 5654291 U JP5654291 U JP 5654291U JP H058444 U JPH058444 U JP H058444U
- Authority
- JP
- Japan
- Prior art keywords
- cylinder pressure
- measuring device
- combustion noise
- noise measuring
- pressure sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Measuring Fluid Pressure (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Testing Of Engines (AREA)
Abstract
(57)【要約】
【目的】 可聴域である１〜２ＫHzの筒内圧力レベルの
分析を行うことができる燃焼騒音測定装置を提供するこ
と。
【構成】 内燃機関の燃焼室の筒内圧を検出する筒内圧
センサ１１で検知された筒内圧信号をハイパスフィルタ
１３１を介して周波数分析器１３３に出力するようにし
ている。
(57) [Abstract] [Purpose] To provide a combustion noise measuring device capable of analyzing the in-cylinder pressure level in the audible range of 1 to 2 KHz. A cylinder pressure signal detected by a cylinder pressure sensor 11 that detects a cylinder pressure in a combustion chamber of an internal combustion engine is output to a frequency analyzer 133 via a high pass filter 131.
Description
【０００１】[0001]
本考案は内燃機関の燃焼騒音を測定する燃焼騒音測定装置に関する。 The present invention relates to a combustion noise measuring device for measuring combustion noise of an internal combustion engine.
【０００２】[0002]
従来の燃焼騒音測定装置は図３に示すように構成されていた。図３において、 １は例えばディ−ゼルエンジンのシリンダ内の筒内圧を検知する筒内圧センサで ある。この筒内圧センサ１の出力信号はチャ−ジアンプ２に送られて増幅された 後、ＦＦＴアナライザ（周波数分析器）３に入力される。 このようにして、ＦＦＴアナライザ３において図２の従来で示したような周波 数ｆに対する筒内圧力レベル（ＣＰＬ）（dB）が得られていた。 The conventional combustion noise measuring device is configured as shown in FIG. In FIG. 3, reference numeral 1 denotes an in-cylinder pressure sensor for detecting an in-cylinder pressure in a cylinder of a diesel engine, for example. The output signal of the in-cylinder pressure sensor 1 is sent to the charge amplifier 2, amplified, and then input to the FFT analyzer (frequency analyzer) 3. In this way, the in-cylinder pressure level (CPL) (dB) with respect to the frequency f as shown in the prior art of FIG. 2 was obtained in the FFT analyzer 3.
【０００３】[0003]
しかし、従来のＦＦＴアナライザ３はそのダイナミックレンジが７２dBしかな った。このため、図２に示すように従来の筒内圧力レベルの低周波成分は２１０ dBある為、１３８dB（＝２１０−７２）までしか分析できなかった。 このため、可聴域である１〜２ＫHzの筒内圧力レベルが分析できないという問 題点があった。 However, the conventional FFT analyzer 3 has a dynamic range of only 72 dB. Therefore, as shown in FIG. 2, the low frequency component of the conventional in-cylinder pressure level is 210 dB, so that only 138 dB (= 210−72) can be analyzed. For this reason, there was a problem that the cylinder pressure level in the audible range of 1 to 2 KHz could not be analyzed.
【０００４】 本考案は上記の点に鑑みてなされたもので、その目的は可聴域である１〜２Ｋ Hzの筒内圧力レベルの分析を行うことができる燃焼騒音測定装置を提供すること にある。The present invention has been made in view of the above points, and an object thereof is to provide a combustion noise measuring device capable of analyzing the in-cylinder pressure level in the audible range of 1 to 2 KHz. ..
【０００５】[0005]
本考案の燃焼騒音測定装置は内燃機関の燃焼室の筒内圧を検出する筒内圧セン サと、この筒内圧センサで検知された筒内圧信号の周波数分析を行う周波数分析 器を有する燃焼騒音測定装置において、前記筒内圧センサから得られる筒内圧信 号をハイパスフィルタを介して前記周波数分析器に出力するようにしたことを特 徴とする燃焼騒音測定装置である。 The combustion noise measuring device of the present invention comprises a cylinder pressure sensor for detecting a cylinder pressure in a combustion chamber of an internal combustion engine, and a combustion noise measuring device having a frequency analyzer for performing a frequency analysis of a cylinder pressure signal detected by the cylinder pressure sensor. In the above, the combustion noise measuring device is characterized in that the in-cylinder pressure signal obtained from the in-cylinder pressure sensor is output to the frequency analyzer through a high-pass filter.
【０００６】[0006]
筒内圧センサ１１の出力をハイパスフィルタを介してＦＦＴアナライザに入力 させるようにしている。 The output of the in-cylinder pressure sensor 11 is input to the FFT analyzer via a high pass filter.
【０００７】[0007]
以下図面を参照して本考案の一実施例の動作について説明する。図１において 、１１は例えば、ディ−ゼルエンジンのシリンダ内の筒内圧を検知する筒内圧セ ンサである。この筒内圧センサ１１の出力信号はチャ−ジアンプ１２に送られて 増幅された後、燃焼騒音測定部１３に入力される。この燃焼騒音測定部１３は１ ００Hz程度のハイパスフィルタ１３１により入力信号の低周波域を遮断した後、 直流アンプ１３２を介して約５０倍に信号を増幅し、ＦＦＴアナライザ１３３に 入力している。 The operation of one embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 11 denotes an in-cylinder pressure sensor for detecting an in-cylinder pressure in a cylinder of a diesel engine, for example. The output signal of the in-cylinder pressure sensor 11 is sent to the charge amplifier 12, amplified, and then input to the combustion noise measuring unit 13. The combustion noise measuring unit 13 cuts off the low frequency region of the input signal by a high-pass filter 131 of about 100 Hz, amplifies the signal about 50 times via the DC amplifier 132, and inputs the amplified signal to the FFT analyzer 133.
【０００８】 このように、ハイパスフィルタ１３１を設けることにより、１００Hz付近の筒 内圧力レベルを１７０dBとすると、９８dB（＝１７０−７２）までＦＦＴアナラ イザ１３３で筒内圧力レベルを分析することができる。In this way, by providing the high-pass filter 131, when the in-cylinder pressure level near 100 Hz is 170 dB, the FFT analyzer 133 can analyze the in-cylinder pressure level up to 98 dB (= 170−72). ..
【０００９】 従って、図２の本願で示した領域には、１ＫHz〜２ＫHzの可聴域が入るため、 ＦＦＴアナライザ１３３において、可聴域の筒内圧力レベルの分析、つまり燃焼 騒音の分析を行うことができる。Therefore, since the audible range of 1 KHz to 2 KHz is included in the region shown in FIG. 2 of the present application, the FFT analyzer 133 can analyze the in-cylinder pressure level, that is, the combustion noise. it can.
【００１０】[0010]
以上詳述したように本考案によれば、可聴域である１〜２ＫHzの筒内圧力レベ ルの分析を行うことができる燃焼騒音測定装置を提供することができる。 As described in detail above, according to the present invention, it is possible to provide a combustion noise measuring device capable of analyzing the in-cylinder pressure level in the audible range of 1 to 2 KHz.
【図面の簡単な説明】[Brief description of drawings]
【図１】本考案の一実施例に係わる燃焼騒音測定装置を
示すブロック図。FIG. 1 is a block diagram showing a combustion noise measuring device according to an embodiment of the present invention.
【図２】筒内圧力レベルの周波数特性を示す図。FIG. 2 is a diagram showing a frequency characteristic of a cylinder pressure level.
【図３】従来の燃焼騒音測定装置を示すブロック図。FIG. 3 is a block diagram showing a conventional combustion noise measuring device.
１１…筒内圧力センサ、１２…チャ−ジアンプ、１３…
燃焼騒音測定部、１３１…ハイパスフィルタ、１３２…
直流アンプ、１３３…ＦＦＴアナライザ。11 ... In-cylinder pressure sensor, 12 ... Charge amplifier, 13 ...
Combustion noise measurement unit, 131 ... High-pass filter, 132 ...
DC amplifier 133, FFT analyzer.
Claims (1)
内圧センサと、この筒内圧センサで検知された筒内圧信
号の周波数分析を行う周波数分析器を有する燃焼騒音測
定装置において、前記筒内圧センサから得られる筒内圧
信号をハイパスフィルタを介して前記周波数分析器に出
力するようにしたことを特徴とする燃焼騒音測定装置。[Claims for utility model registration] 1. A cylinder pressure sensor for detecting a cylinder pressure of a combustion chamber of an internal combustion engine, and a frequency analyzer for performing a frequency analysis of a cylinder pressure signal detected by the cylinder pressure sensor. In the combustion noise measuring device, the in-cylinder pressure signal obtained from the in-cylinder pressure sensor is output to the frequency analyzer via a high-pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5654291U JPH058444U (en) | 1991-07-19 | 1991-07-19 | Combustion noise measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5654291U JPH058444U (en) | 1991-07-19 | 1991-07-19 | Combustion noise measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH058444U true JPH058444U (en) | 1993-02-05 |
Family
ID=13029976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5654291U Withdrawn JPH058444U (en) | 1991-07-19 | 1991-07-19 | Combustion noise measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH058444U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4964139U (en) * | 1972-09-14 | 1974-06-05 |
-
1991
- 1991-07-19 JP JP5654291U patent/JPH058444U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4964139U (en) * | 1972-09-14 | 1974-06-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19951102 |