JPS6229010B2 - - Google Patents
Info
- Publication number
- JPS6229010B2 JPS6229010B2 JP4389580A JP4389580A JPS6229010B2 JP S6229010 B2 JPS6229010 B2 JP S6229010B2 JP 4389580 A JP4389580 A JP 4389580A JP 4389580 A JP4389580 A JP 4389580A JP S6229010 B2 JPS6229010 B2 JP S6229010B2
- Authority
- JP
- Japan
- Prior art keywords
- reference voltage
- signal
- engine
- vibration signal
- knocking
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009131 signaling function Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
- G01L23/225—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines circuit arrangements therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Testing Of Engines (AREA)
- Electrical Control Of Ignition Timing (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
本発明は、内燃機関用ノツキング検出装置に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a knocking detection device for an internal combustion engine.
内燃機関における混合気の燃焼を適切に制御す
るために、内燃機関の軽微なノツキングをも検出
するノツキング検出装置が用いられている。ノツ
キング検出装置はシリンダ内の異常燃焼による燃
焼ガス内の圧力振動に起因する内燃機関の機関的
振動を検出することによりノツキングを検出する
ものである。 In order to appropriately control the combustion of an air-fuel mixture in an internal combustion engine, a knocking detection device that detects even slight knocking in the internal combustion engine is used. The knocking detection device detects knocking by detecting engine vibrations of an internal combustion engine caused by pressure vibrations in combustion gas due to abnormal combustion within a cylinder.
かかる内燃機関用ノツキング検出装置の従来例
を第１図を参照して説明する。 A conventional example of such a knocking detection device for an internal combustion engine will be explained with reference to FIG.
第１図において、振動センサ１は、車両に搭載
された機関本体に取付けられ、機関の振動を電気
信号に変換する。フイルタ２は振動センサ１の電
気信号の雑音成分を取る除いた所定周波数帯域の
機関振動信号のみ通過させ、第１増幅器３は、機
関振動信号を増幅する。また、基準電圧発生回路
４は、機関振動信号の平均レベルに対応した通常
の機関振動信号より高レベルの基準電圧を発生
し、第２増幅器５は基準電圧を増幅する。比較器
６は、増幅された機関振動信号が増幅された基準
電圧を越えた時ノツキング信号を発生し、サンプ
ルホールド回路７は、ノツキング信号に応じてサ
ンプルホールド信号を発生し、基準電圧を所定値
に保持して基準電圧の上昇を防止する。このよう
な構成によつてノツキング信号が検出され、この
ノツキング信号は、内燃機関の点火進角制御装置
の制御信号源として使用される。 In FIG. 1, a vibration sensor 1 is attached to an engine body mounted on a vehicle, and converts engine vibrations into electrical signals. The filter 2 removes the noise component of the electrical signal from the vibration sensor 1 and passes only the engine vibration signal in a predetermined frequency band, and the first amplifier 3 amplifies the engine vibration signal. Further, the reference voltage generation circuit 4 generates a reference voltage having a higher level than a normal engine vibration signal corresponding to the average level of the engine vibration signal, and the second amplifier 5 amplifies the reference voltage. The comparator 6 generates a knocking signal when the amplified engine vibration signal exceeds the amplified reference voltage, and the sample and hold circuit 7 generates a sample and hold signal in response to the knocking signal, and sets the reference voltage to a predetermined value. to prevent the reference voltage from rising. With such a configuration, a knocking signal is detected, and this knocking signal is used as a control signal source for an ignition advance control device for an internal combustion engine.
しかし、上記のような構成の内燃機関用ノツキ
ング検出装置によれば、基準電圧発生回路４が積
分時定数を有するため機関始動時における基準電
圧発生回路４の基準電圧は低レベルにある故、機
関が始動してから機関振動信号の平均レベルに対
応した電圧に至るまで所定時間を要する。このた
め機関始動直後には増幅された機関振動信号のレ
ベルが増幅された基準電圧を越えた状態になり、
比較器６はノツキング信号を発生してしまう。さ
らに、このノツキング信号によつてサンプルホー
ルド回路が上記基準電圧の上昇を停止するため正
確にノツキングを検出できないという問題点があ
つた。この問題点を解決した従来例としては振動
センサの出力がない場合においても上記基準電圧
が所定値であるようにオフセツトする方式のもの
があるが、この方式は動作のダイナミツクレンジ
が縮少してしまうという別の問題点があつた。 However, according to the knocking detection device for an internal combustion engine configured as described above, since the reference voltage generating circuit 4 has an integral time constant, the reference voltage of the reference voltage generating circuit 4 is at a low level when the engine is started. It takes a predetermined time after the engine starts to reach a voltage corresponding to the average level of the engine vibration signal. Therefore, immediately after the engine starts, the level of the amplified engine vibration signal exceeds the amplified reference voltage.
Comparator 6 generates a knocking signal. Furthermore, the knocking signal causes the sample and hold circuit to stop increasing the reference voltage, so there is a problem that knocking cannot be detected accurately. A conventional example of solving this problem is a method in which the reference voltage is offset so that it remains at a predetermined value even when there is no output from the vibration sensor, but this method reduces the dynamic range of operation. There was another problem: storage.
そこで、本発明の目的は、従例技術における上
記問題点を解決した内燃機関用ノツキング検出装
置を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a knocking detection device for an internal combustion engine that solves the above-mentioned problems in the prior art.
本発明による内燃機関用ノツキング検出装置
は、振動センサからの出力信号を処理して機関振
動信号とする処理手段と、機関振動信号レベルが
所定レベルを越えるまで補正信号を発生する補正
手段と、機関振動信号と補正信号とに応じて基準
電圧を発生する基準電圧発生手段と、機関振動信
号レベルが前記基準電圧を越えたときノツキング
信号を発生する比較手段とを有することを特徴と
しており、機関始動してから機関振動信号が所定
レベルに達するまでは補正信号を発生し、該補正
信号から基準電圧を得てノツキング発生を判別す
るのである。 The knocking detection device for an internal combustion engine according to the present invention includes a processing means for processing an output signal from a vibration sensor to generate an engine vibration signal, a correction means for generating a correction signal until the engine vibration signal level exceeds a predetermined level, and an engine vibration signal. It is characterized by having a reference voltage generating means for generating a reference voltage according to the vibration signal and the correction signal, and a comparison means for generating a knocking signal when the engine vibration signal level exceeds the reference voltage, After that, a correction signal is generated until the engine vibration signal reaches a predetermined level, and a reference voltage is obtained from the correction signal to determine whether knocking has occurred.
以下、本発明の実施例を第２図及び第３図を参
照して詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3.
第２図は本発明による内燃機関用ノツキング検
出装置を示し、振動センサ１と、フイルタ２と、
第１増幅器３と、基準電圧発生回路４と、第２増
幅器５と、比較器６と、サンプルホールド回路７
とを有し、更に補正回路８を有する。補正回路８
は、機関始動前の機関振動信号が低レベルの時に
は基準電圧を機関振動信号に無関係な所定値にす
る補正信号を発生する。本発明における基準電圧
発生回路４及び補正回路８は、第３図に示す回路
によつて構成される。基準電圧発生回路４は、フ
イルタ２が発生した機関振動信号を半波整流する
半波整流器９と、半波整流器９の出力信号を所定
電圧Vr1において分圧して分圧電圧を発生する抵
抗R1，R2と、分圧電圧を電圧フオロアする演算
増幅器OP1と、演算増幅器OP1の出力電圧を積分
する抵抗R3及びコンデンサC1からなる。補正回
路８は、増幅回路を形成する演算増幅器OP2、抵
抗R4〜R6と、時定数回路を形成するダイオード
D1、抵抗R7，R8、コンデンサC2と、比較回路を
形成する演算増幅器OP3、抵抗R9〜R12、ダイオ
ードD2から構成される。 FIG. 2 shows a knocking detection device for an internal combustion engine according to the present invention, which includes a vibration sensor 1, a filter 2,
The first amplifier 3, the reference voltage generation circuit 4, the second amplifier 5, the comparator 6, and the sample hold circuit 7
and further includes a correction circuit 8. Correction circuit 8
generates a correction signal that sets the reference voltage to a predetermined value unrelated to the engine vibration signal when the engine vibration signal is at a low level before the engine is started. The reference voltage generation circuit 4 and correction circuit 8 in the present invention are constructed by the circuit shown in FIG. The reference voltage generation circuit 4 includes a half-wave rectifier 9 that half-wave rectifies the engine vibration signal generated by the filter 2, and a resistor R that divides the output signal of the half-wave rectifier 9 at a predetermined voltage Vr 1 to generate a divided voltage. 1 , R2 , an operational amplifier OP1 that follows the divided voltage, a resistor R3 and a capacitor C1 that integrate the output voltage of the operational amplifier OP1 . The correction circuit 8 includes an operational amplifier OP 2 forming an amplifier circuit, resistors R 4 to R 6 , and a diode forming a time constant circuit.
D1 , resistors R7 , R8 , capacitor C2 , operational amplifier OP3 forming a comparison circuit, resistors R9 to R12 , and diode D2 .
上記した構成の基準電圧発生回路４及び補正回
路８は次の様に動作する。まず、機関始動前の回
路に電源が供給された状態においては、機関振動
信号が存在しないため、基準電圧発生回路４の基
準電圧を発生するコンデンサC1の電位は低レベ
ルにあり、また補正回路８のコンデンサC2の電
位も低レベルになつている。演算増幅器OP3の負
入力端子にコンデンサC2の電圧が、また正入力
端子に所定電圧Vr2を抵抗R9，R10によつて分圧
した分圧電圧が印加され、コンデンサC2の電圧
が分圧電圧以下のため出力端子には高レベルの補
正信号を発生する。このため補正信号は、ダイオ
ードD2を介して基準電圧発生回路４に流れ、コ
ンデンサC1の電位を所定値にする。次に、機関
が始動して機関振動信号が発生すると、基準電圧
発生回路４では機関振動信号を半波整流、分圧及
び電圧フオロアした電圧が抵抗R3を介してコン
デンサC1に印加される。コンデンサC1の電位は
すでに所定値を有している故、機関振動信号の平
均レベルに対応した電圧に直ちに追随する。同時
に、補正回路８では、演算増幅器OP2が機関振動
信号を所定電圧Vr3に対して増幅してコンデンサ
C2の電位を高レベルにする。演算増幅器OP3の負
入力端子に印加するコンデンサC2の電位が正入
力端子の電圧より大となるため演算増幅器OP3の
出力は低レベルに反転して補正信号の発生を停止
する。この場合、低レベル出力はダイオードD2
の向きが逆方向になるためコンデンサC1に影響
を与えない。 The reference voltage generation circuit 4 and correction circuit 8 having the above configuration operate as follows. First, when power is supplied to the circuit before starting the engine, there is no engine vibration signal, so the potential of the capacitor C1 that generates the reference voltage of the reference voltage generation circuit 4 is at a low level, and the correction circuit The potential of capacitor C2 at No. 8 is also at a low level. The voltage of capacitor C 2 is applied to the negative input terminal of operational amplifier OP 3 , and the divided voltage obtained by dividing the predetermined voltage Vr 2 by resistors R 9 and R 10 is applied to the positive input terminal. Since it is less than the divided voltage, a high level correction signal is generated at the output terminal. Therefore, the correction signal flows to the reference voltage generation circuit 4 via the diode D2 , and sets the potential of the capacitor C1 to a predetermined value. Next, when the engine starts and an engine vibration signal is generated, the reference voltage generation circuit 4 applies half-wave rectification, voltage division, and voltage follower of the engine vibration signal to the capacitor C1 via the resistor R3. . Since the potential of the capacitor C1 already has a predetermined value, it immediately follows the voltage corresponding to the average level of the engine vibration signal. At the same time, in the correction circuit 8, the operational amplifier OP 2 amplifies the engine vibration signal to a predetermined voltage Vr 3 and outputs the signal to the capacitor.
Increase the potential of C 2 to a high level. Since the potential of the capacitor C2 applied to the negative input terminal of the operational amplifier OP3 becomes higher than the voltage at the positive input terminal, the output of the operational amplifier OP3 is inverted to a low level and stops generating the correction signal. In this case, the low level output is connected to diode D2
Since the direction of the capacitor C1 is opposite, it does not affect the capacitor C1 .
このように本発明による内燃機関用ノツキング
検出装置を用いれば、機関始動時から基準電圧は
機関振動信号に無関係に高レベルにあり誤動作が
避けられるものである。 As described above, by using the knocking detection device for an internal combustion engine according to the present invention, the reference voltage is at a high level from the time the engine is started, regardless of the engine vibration signal, and malfunctions can be avoided.
第１図は内燃機関用ノツキング検出装置の従来
例を示すブロツク図、第２図は本発明による内燃
機関用ノツキング検出装置の実施例を示すブロツ
ク図、第３図は本発明による内燃機関用ノツキン
グ検出装置の基準電圧発生回路及び補正回路の実
施例を示す回路図である。
主要部分の符号の説明、１……振動センサ、２
……フイルタ、３……第１増幅器、４……基準電
圧発生回路、５……第２増幅器、６……比較器、
７……サンプルホールド回路、８……補正回路。
FIG. 1 is a block diagram showing a conventional example of a knocking detection device for an internal combustion engine, FIG. 2 is a block diagram showing an embodiment of a knocking detection device for an internal combustion engine according to the present invention, and FIG. 3 is a block diagram showing a knocking detection device for an internal combustion engine according to the present invention. FIG. 2 is a circuit diagram showing an example of a reference voltage generation circuit and a correction circuit of the detection device. Explanation of symbols of main parts, 1... Vibration sensor, 2
... Filter, 3 ... First amplifier, 4 ... Reference voltage generation circuit, 5 ... Second amplifier, 6 ... Comparator,
7...Sample hold circuit, 8...Correction circuit.
Claims (1)
処理して機関振動信号とする処理手段と、前記機
関振動信号レベルが所定レベルを越えるまで所定
の補正信号を発生する補正手段と、前記機関振動
信号と前記補正信号とに応じて基準電圧を発生す
る基準電圧発生手段と、前記機関振動信号レベル
が前記基準電圧を越えたときノツキング信号を発
生する比較手段とからなることを特徴とする内燃
機関用ノツキング検出装置。 ２ 前記基準電圧発生手段は、機関始動前に前記
補正信号に応じて前記基準電圧を発生し、機関始
動後の前記機関振動信号の増大に従つて前記機関
振動信号に応じて前記基準電圧を発生することを
特徴とする特許請求の範囲第１項記載の内燃機関
用ノツキング検出装置。[Scope of Claims] 1. A vibration sensor, processing means for processing a signal from the vibration sensor to generate an engine vibration signal, and correction means for generating a predetermined correction signal until the engine vibration signal level exceeds a predetermined level. and a reference voltage generating means for generating a reference voltage according to the engine vibration signal and the correction signal, and a comparison means for generating a knocking signal when the engine vibration signal level exceeds the reference voltage. Knocking detection device for internal combustion engines. 2. The reference voltage generating means generates the reference voltage according to the correction signal before starting the engine, and generates the reference voltage according to the engine vibration signal as the engine vibration signal increases after the engine starts. A knocking detection device for an internal combustion engine according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4389580A JPS56140233A (en) | 1980-04-03 | 1980-04-03 | Knocking detection device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4389580A JPS56140233A (en) | 1980-04-03 | 1980-04-03 | Knocking detection device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56140233A JPS56140233A (en) | 1981-11-02 |
| JPS6229010B2 true JPS6229010B2 (en) | 1987-06-24 |
Family
ID=12676437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4389580A Granted JPS56140233A (en) | 1980-04-03 | 1980-04-03 | Knocking detection device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56140233A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2912185B1 (en) * | 2007-02-05 | 2009-03-13 | Siemens Vdo Automotive Sas | DEVICE AND METHOD FOR PROCESSING CLICK SIGNALS OF AN INTERNAL COMBUSTION ENGINE WITH INFLUENCE REDUCTION OF PARASITE NOISE |
-
1980
- 1980-04-03 JP JP4389580A patent/JPS56140233A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56140233A (en) | 1981-11-02 |
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