JPH089981B2 - Engine noise reduction device - Google Patents
Engine noise reduction deviceInfo
- Publication number
- JPH089981B2 JPH089981B2 JP61012617A JP1261786A JPH089981B2 JP H089981 B2 JPH089981 B2 JP H089981B2 JP 61012617 A JP61012617 A JP 61012617A JP 1261786 A JP1261786 A JP 1261786A JP H089981 B2 JPH089981 B2 JP H089981B2
- Authority
- JP
- Japan
- Prior art keywords
- engine
- ignition timing
- cylinder
- low
- extreme value
- 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.)
- Expired - Lifetime
Links
Landscapes
- Electrical Control Of Ignition Timing (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、エンジンの騒音を低減する装置に関す
る。TECHNICAL FIELD The present invention relates to a device for reducing engine noise.
（従来の技術） ガソリンエンジンにおいて燃焼騒音はそれほど問題に
ならないが、ノッキング等の異常燃焼を起こしたりする
と、不快音のもととなる。(Prior Art) Combustion noise is not a serious problem in a gasoline engine, but if abnormal combustion such as knocking occurs, it causes an unpleasant noise.
エンジンの高性能化に伴ってノック限界で運転される
場合が多くなっており、このため第４図に示すようにエ
ンジン１のシリンダブロック２にノックセンサ（例えば
振動センサ）３を取り付け、その検出信号に応じて各気
筒の点火時期を制御することにより、ノッキングの発生
を抑えるものがある。As the engine becomes more sophisticated, it is often operated at the knock limit. Therefore, as shown in FIG. 4, a knock sensor (for example, a vibration sensor) 3 is attached to the cylinder block 2 of the engine 1 and its detection is detected. Some control the ignition timing of each cylinder according to a signal to suppress the occurrence of knocking.
この場合、ノックセンサ３の検出信号は増幅器４、バ
ンドパスフィルタ５により処理されてノッキングに関連
の強い振動成分が制御回路６に入力され、その振動成分
が所定値以上のときに制御回路６がディストリビュータ
７を介して全気筒の点火時期を遅角制御するようになっ
ている。In this case, the detection signal of the knock sensor 3 is processed by the amplifier 4 and the bandpass filter 5 and a strong vibration component related to knocking is input to the control circuit 6, and when the vibration component is equal to or more than a predetermined value, the control circuit 6 The ignition timings of all the cylinders are retarded through the distributor 7.
また、第５図に示すように各気筒の点火栓８にそれぞ
れ圧力センサ９を取り付け、対応する検出信号に応じて
ノッキングを生じている気筒の点火時期を個別に遅角制
御するものもある（特開昭57−26267号、105557号公報
等参照）。Further, as shown in FIG. 5, a pressure sensor 9 is attached to each of the spark plugs 8 of each cylinder, and the ignition timing of each cylinder in which knocking is occurring is individually retarded according to a corresponding detection signal ( (See JP-A-57-26267, 105557, etc.).
（発明が解決しようとする問題点） しかしながら、このような装置にあっては、単にノッ
キングを回避することが可能であるだけで、各気筒にお
ける筒内圧力は必ずしも均一には揃わない。例えば、４
気筒エンジンの場合、各気筒の燃焼圧力がクランクに作
用して生ずるエンジン振動のスペクトラムは第６図のよ
うになっており、クランク回転の偶数次成分のみでな
く、奇数次成分や整数次＋1/2次成分も大きなレベルで
存在している。(Problems to be Solved by the Invention) However, in such a device, knocking can be simply avoided, and the in-cylinder pressure in each cylinder is not necessarily uniform. For example, 4
In the case of a cylinder engine, the spectrum of engine vibration caused by the combustion pressure of each cylinder acting on the crank is as shown in Fig. 6. Not only the even-order components of the crank rotation but also the odd-order components and the integer-order + 1 / Secondary components also exist at a large level.
このような整数次＋1/2次の振動成分はエンジンから
マウント系、マウント系から車体へと伝達する間に増幅
され、これが車内騒音をもたらすことになる。特に加速
時のように、第６図のイ，ロ，ハで示される近接したハ
ーモニクス成分が大きく存在すると、これらは第７図の
波形で示されるようにビート状のエンベロープ（包絡
線）Ａを持ついわゆるゴロ音となり、耳障りな騒音とな
るのである。Such integer +1/2 order vibration components are amplified during transmission from the engine to the mount system and from the mount system to the vehicle body, which causes noise in the vehicle. Especially when there is a large number of adjacent harmonics components indicated by a, b, and c in FIG. 6, such as during acceleration, these produce a beat-shaped envelope (envelope) A as shown in the waveform in FIG. It becomes a so-called rumbling sound that it has and becomes an offensive noise.
この発明は、このような耳障りな騒音を低減すること
を目的としている。The present invention aims to reduce such annoying noise.
（問題点を解決するための手段） この発明は、エンジンの振動を検出する振動センサ
と、この検出信号の200〜500Hzの範囲内の低周波成分を
抽出するローパスフィルタと、この低周波成分の信号波
形の包絡線の各極値を検出する振幅検出器と、この各極
値を比較する比較器とを設け、この比較値に応じて最大
極値直前にて点火されるエンジンフライホイールに最も
近い気筒の点火時期を遅角する点火時期制御回路を備え
る。(Means for Solving Problems) The present invention relates to a vibration sensor for detecting engine vibration, a low-pass filter for extracting a low-frequency component within a range of 200 to 500 Hz of the detection signal, and a low-pass filter for the low-frequency component. An amplitude detector that detects each extreme value of the envelope of the signal waveform and a comparator that compares each extreme value are provided, and the engine flywheel that is ignited immediately before the maximum extreme value according to this comparison value is the most An ignition timing control circuit that retards the ignition timing of a close cylinder is provided.
（作用） 従って、振動検出センサの検出信号を処理してゴロ音
の原因となる200〜500Hzの範囲内の低周波成分の信号波
形の包絡線の各極値を検出することで、ゴロ音の発生状
態が検知されると共に、その各極値に応じて最大極値直
前で点火されるエンジンフライホイールに最も近い気筒
の点火時期を遅角することにより、各気筒での燃焼圧力
が平均化される。特に、燃焼加振力に対する振動感度が
最も高いフライホイール最近気筒の点火時期遅角により
各気筒における加振力の不揃いの影響が効果的に減殺さ
れ、ゴロ音の発生が確実に抑制される。(Operation) Therefore, by processing the detection signal of the vibration detection sensor and detecting each extreme value of the envelope of the signal waveform of the low frequency component within the range of 200 to 500 Hz, which causes the noise, When the occurrence state is detected, the combustion pressure in each cylinder is averaged by retarding the ignition timing of the cylinder closest to the engine flywheel that is ignited immediately before the maximum extreme value according to each extreme value. It In particular, the ignition timing retardation of the most recent cylinder of the flywheel, which has the highest vibration sensitivity to the combustion exciting force, effectively cancels the influence of the uneven exciting force in each cylinder, and reliably suppresses the occurrence of noise.
（実施例） 第１図は本発明の実施例を示すもので、エンジン10の
振動を検出する振動センサ11がエンジン10のマウンティ
ングブラケット12（もしくはシリンダブロック13）に取
り付けられ、その検出信号は増幅器14を介してローパス
フィルタ15に送られる。(Embodiment) FIG. 1 shows an embodiment of the present invention, in which a vibration sensor 11 for detecting vibration of the engine 10 is attached to a mounting bracket 12 (or a cylinder block 13) of the engine 10, and a detection signal thereof is an amplifier. It is sent to the low-pass filter 15 via 14.
ローパスフィルタ15は増幅された検出信号の低周波成
分を抽出し、200〜500Hzの間の周波数成分の信号を整流
器16に送る。この周波数成分の信号は、エンジン10の各
気筒の燃焼圧力が不揃いのときは第２図（ａ）のＢで示
される。The low-pass filter 15 extracts the low frequency component of the amplified detection signal and sends the signal of the frequency component between 200 and 500 Hz to the rectifier 16. The signal of this frequency component is shown by B in FIG. 2A when the combustion pressures of the cylinders of the engine 10 are not uniform.
整流器16は信号Ｂを整流して、その信号の第２図
（ａ）のＣで示されるエンベロープ波形（包絡線）を抽
出し、振幅検出器17に送る。The rectifier 16 rectifies the signal B, extracts the envelope waveform (envelope) of the signal indicated by C in FIG. 2A, and sends it to the amplitude detector 17.
振幅検出器17はエンベロープ波形Ｃの振幅の各極値
を、この場合第２図（ａ）のように各極大値L,Mを検出
し、比較器18に送る。The amplitude detector 17 detects each extreme value of the amplitude of the envelope waveform C, in this case, each maximum value L, M as shown in FIG. 2A, and sends it to the comparator 18.
比較器18は各極大値L,Mを比較し、その比L/Mが比較器
18に記憶または設定された基準値よりも大きいときは、
所定の気筒の点火時期を微少角だけ遅角するように点火
時期制御回路19に遅角信号を送る。比較器18にはディス
トリビュータ20から各気筒の点火時期を知らせるゲート
信号（第２図（ｂ）が入力されており、比較器18はその
ゲート信号と最大極大値Ｌとが送られるタイミングか
ら、例えば最大極大値Ｌを生ずる直前に点火時期制御回
路19に遅角信号を送るようになっている。The comparator 18 compares the maximum values L and M, and the ratio L / M is the comparator.
If it is larger than the reference value stored or set in 18,
A retard signal is sent to the ignition timing control circuit 19 so as to retard the ignition timing of a predetermined cylinder by a slight angle. A gate signal (FIG. 2 (b)) for notifying the ignition timing of each cylinder is input from the distributor 20 to the comparator 18, and the comparator 18 determines, for example, from the timing when the gate signal and the maximum maximum value L are sent. A retard signal is sent to the ignition timing control circuit 19 immediately before the maximum maximum value L is generated.
そして、点火時期制御回路19は、その遅角信号に応じ
て最大極大値Ｌを生じる直前に点火されるフライホイー
ル21に最も近い気筒の点火時期を微少角、遅角するよう
に制御する。なお、22〜25は点火栓を示す。Then, the ignition timing control circuit 19 controls the ignition timing of the cylinder closest to the flywheel 21 which is ignited immediately before the maximum maximum value L is generated in accordance with the retard signal so as to slightly retard or retard. 22 to 25 are spark plugs.
このような構成において、エンジンの加速時等には各
気筒での燃焼圧力が揃いにくいため、このようなときに
は振動センサ11から第６図のような振動が検出される
が、その検出信号は増幅器14、ローパスフィルタ15、整
流器16によってゴロ音の原因となるビート状のエンベロ
ープ波形（第２図（ａ）のＣ）に処理される。In such a configuration, when the engine is accelerated, the combustion pressures in the respective cylinders are less likely to be uniform, so the vibration sensor 11 detects vibrations as shown in FIG. 6 in such a case. 14, the low-pass filter 15 and the rectifier 16 process the beat-like envelope waveform (C in FIG. 2 (a)) that causes the noise.
ここで、各気筒での燃焼圧力の差が大きいと、第２図
（ａ）のようにエンベロープ波形Ｃのビートが大きくな
り、ゴロ音が大きくなるが、そのエンベロープ波形Ｃの
各極大値L,Mが振幅検出器17によって検出され、その比L
/Mが基準値より大きいと、比較器18、点火時期制御回路
19により最大極大値Ｌを生ずる直前に点火される気筒と
フライホイール21に最も近い気筒の点火時期が微小各遅
角される。Here, if the difference in the combustion pressure between the cylinders is large, the beat of the envelope waveform C becomes large and the gurgling sound becomes large as shown in FIG. 2 (a), but the maximum value L of each of the envelope waveform C, M is detected by the amplitude detector 17 and its ratio L
If / M is larger than the reference value, comparator 18, ignition timing control circuit
The ignition timings of the cylinder that is ignited immediately before the maximum maximum value L is generated by 19 and the cylinder that is closest to the flywheel 21 are slightly retarded.
これにより、各気筒での燃焼圧力、加振力が均一化さ
れ、例えばこのときのエンベロープ波形は第３図のよう
に滑らかな波形となる。従って、燃焼圧力の不揃いに起
因する耳障りなゴロ音の発生を低減することができ、加
速時等における車内音音質を改善することが可能とな
る。As a result, the combustion pressure and the exciting force in each cylinder are made uniform, and the envelope waveform at this time becomes a smooth waveform as shown in FIG. Therefore, it is possible to reduce the generation of an offensive noise due to the uneven combustion pressure, and it is possible to improve the sound quality of the in-vehicle sound during acceleration or the like.
（発明の効果） 以上のように本発明によれば、振動センサの検出信号
を処理してゴロ音の原因となる200〜500Hzの低周波成分
を抽出し、その信号波形の包絡線の各極値を検出し、各
極値の比に応じて最大極値直前にて点火されるエンジン
フライホイールに最も近くて加振力に敏感に影響する気
筒の点火時期を遅らせるようにしたので、各気筒での燃
焼圧力ないし加振力を均一化でき、燃焼の不揃いに起因
するゴロ音の発生を抑制して加速時等における車内音の
改善が図れるという効果が得られる。As described above, according to the present invention, the detection signal of the vibration sensor is processed to extract the low frequency component of 200 to 500 Hz that causes the noise, and each pole of the envelope of the signal waveform is extracted. It detects the value and delays the ignition timing of the cylinder that is closest to the engine flywheel that is ignited immediately before the maximum extreme value according to the ratio of each extreme value and that sensitively affects the excitation force. It is possible to obtain the effect that the combustion pressure or the excitation force in the vehicle can be made uniform, the generation of the noise caused by the uneven combustion can be suppressed, and the vehicle interior noise at the time of acceleration can be improved.
第１図は本発明の実施例を示す構成図、第２図（ａ），
（ｂ），第３図はそれぞれ各信号の波形を示すグラフ、
第４図，第５図は従来例の構成図、第６図は振動スペク
トラムを示すグラフ、第７図はゴロ音の信号波形を示す
グラフである。 11……振動センサ、15……ローパスフィルタ、 16……整流器、17……振幅検出器、18……比較器、 19……点火時期制御回路、20……ディストリビュータ。FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 (a),
(B), FIG. 3 is a graph showing the waveform of each signal,
4 and 5 are configuration diagrams of a conventional example, FIG. 6 is a graph showing a vibration spectrum, and FIG. 7 is a graph showing a signal waveform of a purring sound. 11 ... Vibration sensor, 15 ... Low-pass filter, 16 ... Rectifier, 17 ... Amplitude detector, 18 ... Comparator, 19 ... Ignition timing control circuit, 20 ... Distributor.
Claims (1)
この検出信号の200〜500Hzの範囲内の低周波成分を抽出
するローパスフィルタと、この低周波成分の信号波形の
包絡線の各極値を検出する振幅検出器と、この各極値を
比較する比較器とを設け、この比較値に応じて最大極値
直前にて点火されるエンジンフライホイールに最も近い
気筒の点火時期を遅角する点火時期制御回路を備えたこ
とを特徴とするエンジンの騒音低減装置。1. A vibration sensor for detecting engine vibration,
A low-pass filter that extracts low-frequency components within the range of 200 to 500 Hz of this detection signal, an amplitude detector that detects each extreme value of the envelope of the signal waveform of this low-frequency component, and each extreme value are compared. An engine noise, characterized by including a comparator, and an ignition timing control circuit for delaying the ignition timing of the cylinder closest to the engine flywheel that is ignited immediately before the maximum extreme value according to the comparison value. Reduction device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61012617A JPH089981B2 (en) | 1986-01-23 | 1986-01-23 | Engine noise reduction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61012617A JPH089981B2 (en) | 1986-01-23 | 1986-01-23 | Engine noise reduction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62170774A JPS62170774A (en) | 1987-07-27 |
| JPH089981B2 true JPH089981B2 (en) | 1996-01-31 |
Family
ID=11810338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61012617A Expired - Lifetime JPH089981B2 (en) | 1986-01-23 | 1986-01-23 | Engine noise reduction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH089981B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR960015822B1 (en) * | 1991-10-03 | 1996-11-21 | 가부시끼가이샤 히다찌세이사꾸쇼 | Closed type motor-driven compressor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57105557A (en) * | 1980-12-24 | 1982-07-01 | Nissan Motor Co Ltd | Ignition controller |
| JPS58192969A (en) * | 1982-05-04 | 1983-11-10 | Nippon Denso Co Ltd | Ignition timing control device for internal-combustion engine |
| DE3243235A1 (en) * | 1982-11-23 | 1984-05-24 | Robert Bosch Gmbh, 7000 Stuttgart | DEVICE FOR DAMPING VIBRATION VIBRATIONS IN AN INTERNAL COMBUSTION ENGINE IN A MOTOR VEHICLE |
| JPS601535A (en) * | 1983-06-17 | 1985-01-07 | Toyota Motor Corp | Knocking detecting device for internal combustion engine |
| JPS60243368A (en) * | 1984-05-18 | 1985-12-03 | Hitachi Ltd | Ignition timing control device for internal-combustion engine |
-
1986
- 1986-01-23 JP JP61012617A patent/JPH089981B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62170774A (en) | 1987-07-27 |
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