JPH04259669A - Combusting condition monitoring device for multi-cylinder internal combustion engine - Google Patents
Combusting condition monitoring device for multi-cylinder internal combustion engineInfo
- Publication number
- JPH04259669A JPH04259669A JP3949191A JP3949191A JPH04259669A JP H04259669 A JPH04259669 A JP H04259669A JP 3949191 A JP3949191 A JP 3949191A JP 3949191 A JP3949191 A JP 3949191A JP H04259669 A JPH04259669 A JP H04259669A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- internal combustion
- combustion engine
- crank angle
- amplifier
- 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.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 43
- 238000012806 monitoring device Methods 0.000 title claims abstract description 9
- 230000005856 abnormality Effects 0.000 claims description 17
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明はシリンダ内圧を検出し内
燃機関の失火等の燃焼異常を検出する内燃機関の燃焼状
態監視装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion state monitoring device for an internal combustion engine that detects cylinder internal pressure and detects combustion abnormalities such as misfire in the internal combustion engine.
【０００２】0002
【従来の技術】従来より、内燃機関のスパークプラグの
座金の位置に圧力センサを挿入してスパークプラグを締
め付け、シリンダ内圧を検出して失火等の燃焼異常を検
出するものがある。従来のこの種の装置は、各気筒に配
設した圧力センサの出力を気筒毎に増幅器（電荷−電圧
増幅器）に接続し、その出力を気筒毎の積分回路、演算
判定回路等に接続して失火等の燃焼異常を検出するもの
であった。2. Description of the Related Art Conventionally, there are internal combustion engines in which a pressure sensor is inserted into the washer of a spark plug to tighten the spark plug, and the internal pressure of the cylinder is detected to detect combustion abnormalities such as misfires. Conventional devices of this kind connect the output of a pressure sensor installed in each cylinder to an amplifier (charge-voltage amplifier) for each cylinder, and connect the output to an integrating circuit, arithmetic judgment circuit, etc. for each cylinder. It was designed to detect combustion abnormalities such as misfires.
【０００３】0003
【発明が解決しようとする課題】しかしながら、上記従
来の装置は気筒の数だけの増幅器、積分回路、演算判定
回路等が必要であり、部品点数が多くなる。このため、
燃焼状態監視装置のコストが高くなり、故障率の増加、
装置の大型化を招くという問題点があった。また、気筒
により異常判定にばらつきが生ずることがあるという問
題点があった。本発明は上記の問題点を解決するためな
されたものであり、その目的とするところは、増幅器、
積分回路、演算判定回路等を一つで済ますことができる
多気筒内燃機関の燃焼状態監視装置を提供することにあ
る。However, the conventional device described above requires as many amplifiers, integration circuits, arithmetic and determination circuits, etc. as there are cylinders, resulting in a large number of parts. For this reason,
The cost of combustion condition monitoring equipment increases, the failure rate increases,
There was a problem in that it led to an increase in the size of the device. Additionally, there is a problem in that abnormality determination may vary depending on the cylinder. The present invention has been made to solve the above problems, and its purpose is to provide an amplifier,
It is an object of the present invention to provide a combustion state monitoring device for a multi-cylinder internal combustion engine that can use only one integrating circuit, a calculation/judgment circuit, etc.
【０００４】0004
【課題を解決するための手段】上記の目的を達成するた
め、本発明では、気筒毎に設けられ各気筒のシリンダ内
圧をその圧力値に応じた電気信号に変換し検出する圧力
センサと、内燃機関のクランク角を検出するクランク角
センサと、前記各気筒毎の圧力センサの出力が並列に接
続されて入力される増幅器と、前記クランク角センサか
らの信号に基づき各気筒の上死点前後の所定期間だけ前
記増幅器からの出力信号を通す選択手段と、前記クラン
ク角センサからの信号と前記選択手段からの増幅器出力
信号に基づき、上死点前後の増幅器出力信号の処理値か
ら当該気筒の失火等の燃焼異常を判定する異常判定手段
と、を備えることを特徴とする多気筒内燃機関の燃焼状
態監視装置が提供される。[Means for Solving the Problems] In order to achieve the above object, the present invention includes a pressure sensor that is provided for each cylinder and detects the cylinder internal pressure of each cylinder by converting it into an electric signal corresponding to the pressure value, and an internal combustion sensor. A crank angle sensor that detects the crank angle of the engine; an amplifier that is connected in parallel with the output of the pressure sensor for each cylinder; and a A selection means for passing the output signal from the amplifier for a predetermined period, and a misfire in the cylinder based on the processed value of the amplifier output signal before and after top dead center based on the signal from the crank angle sensor and the amplifier output signal from the selection means. There is provided a combustion state monitoring device for a multi-cylinder internal combustion engine, comprising: an abnormality determining means for determining combustion abnormalities such as the above.
【０００５】[0005]
【作用】内燃機関ではシリンダ圧は圧縮上死点の近傍で
のみ大きく変化する。従って、各圧力センサを並列に接
続し一つの増幅器に入力してもクランク角センサからの
信号によりどの気筒の圧縮上死点の近傍かを判断すれば
気筒毎の失火等の燃焼異常を判定できる。それ故、上記
のように構成された多気筒内燃機関の燃焼状態監視装置
では、一つの増幅器や異常判定手段を共用して使用でき
るので部品点数を少なくできる。[Operation] In an internal combustion engine, the cylinder pressure changes significantly only near compression top dead center. Therefore, even if each pressure sensor is connected in parallel and input to one amplifier, combustion abnormalities such as misfires can be determined for each cylinder by determining which cylinder is near compression top dead center based on the signal from the crank angle sensor. . Therefore, in the combustion state monitoring device for a multi-cylinder internal combustion engine configured as described above, the number of parts can be reduced because one amplifier and one abnormality determining means can be used in common.
【０００６】[0006]
【実施例】本発明の実施例について図面を参照し説明す
る。図１は燃焼状態監視装置を示すブロック図である。
内燃機関１の各スパークプラグ２には圧力センサ３が取
り付けられている。この圧力センサ３はスパークプラグ
２とシリンダブロックとの間に座金の代わりに取り付け
られる圧電式のセンサであり、各シリンダの内部圧力に
比例した電荷Ｑを発生する。各気筒毎の４つの圧力セン
サ３の出力は並列に接続されチャージアンプ（電荷−電
圧増幅器）４に入力される。チャージアンプ４はオペア
ンプ４１、零点ドリフトを防ぐ帰還抵抗４２、及び帰還
容量４３で構成され、各圧力センサ３から出力された電
荷Ｑを、Ｖ＝Ｑ／Ｃの関係で電圧Ｖに変換して増幅する
。クランク角センサ５はクランク軸の回転角を光学的に
検出し、その回転角に応じたクランク角信号Ｋを送出す
る。チャージアンプ４の出力が入力するアナログスイッ
チ回路６では、クランク角信号Ｋに基づき、各気筒の燃
焼状態における上死点前６０°から上死点後６０°まで
の圧力信号を燃焼異常判定回路７に入力させる。Embodiments Examples of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a combustion state monitoring device. A pressure sensor 3 is attached to each spark plug 2 of the internal combustion engine 1. This pressure sensor 3 is a piezoelectric sensor installed instead of a washer between the spark plug 2 and the cylinder block, and generates an electric charge Q proportional to the internal pressure of each cylinder. The outputs of the four pressure sensors 3 for each cylinder are connected in parallel and input to a charge amplifier (charge-voltage amplifier) 4. The charge amplifier 4 is composed of an operational amplifier 41, a feedback resistor 42 to prevent zero point drift, and a feedback capacitor 43, and converts the charge Q output from each pressure sensor 3 into a voltage V according to the relationship V=Q/C and amplifies it. do. The crank angle sensor 5 optically detects the rotation angle of the crankshaft and sends out a crank angle signal K corresponding to the rotation angle. In the analog switch circuit 6 to which the output of the charge amplifier 4 is input, based on the crank angle signal K, a combustion abnormality determination circuit 7 detects a pressure signal from 60 degrees before top dead center to 60 degrees after top dead center in the combustion state of each cylinder. input.
【０００７】燃焼異常判定回路７の判定原理について図
２を参照し説明する。図２は内燃機関の正常燃焼時と失
火時とにおけるシリンダ内圧出力波形のモデル図である
。正常燃焼時にはシリンダ内圧は上死点後に急上昇する
波形を示す。これに対して失火時には上死点（ＴＤＣ）
を最大圧とし上死点を中心とした略対称な波形を示す。
上死点前の所定クランク角度αから上死点までのシリン
ダ内圧の積分値Ｓ１と、上死点から上死点後の所定クラ
ンク角度αまでの積分値Ｓ２、Ｓ３を比較することによ
り失火か否かを容易に判定することができる。失火時に
おいてはＳ３／Ｓ１≒１であり、正常燃焼時にはＳ２／
Ｓ１＞１である。The determination principle of the combustion abnormality determination circuit 7 will be explained with reference to FIG. FIG. 2 is a model diagram of the cylinder internal pressure output waveform during normal combustion and misfire of the internal combustion engine. During normal combustion, the cylinder internal pressure shows a waveform that rises rapidly after top dead center. On the other hand, when there is a misfire, the top dead center (TDC)
is the maximum pressure and shows a substantially symmetrical waveform centered on top dead center. A misfire can be determined by comparing the integral value S1 of the cylinder internal pressure from a predetermined crank angle α before top dead center to top dead center with the integral values S2 and S3 from top dead center to a predetermined crank angle α after top dead center. It can be easily determined whether or not. At the time of misfire, S3/S1≒1, and at normal combustion, S2/S1
S1>1.
【０００８】上記の判定原理に基づき、燃焼異常判定回
路７は積分回路７１、判定回路７２、表示回路７３から
なる。積分回路７１は上死点前６０°から上死点後６０
°までのチャージアンプ６の出力を積分し、クランク角
信号Ｋに従って、図２に示す面積比Ｓ２／Ｓ１（Ｓ３／
Ｓ１）を演算する。判定回路７２では面積比が所定値た
とえば１．２以下の場合に失火と判定し、表示回路７３
に失火信号を送出する。逆に１．２以上の場合は正常燃
焼と判定し正常信号を表示回路７３に送出する。表示回
路７３は例えば４個のＬＥＤを有し、上記失火信号及び
クランク角信号Ｋに基づいて失火した気筒に該当するＬ
ＥＤを点灯させる。Based on the above-mentioned determination principle, the combustion abnormality determination circuit 7 includes an integrating circuit 71, a determination circuit 72, and a display circuit 73. The integration circuit 71 moves from 60 degrees before top dead center to 60 degrees after top dead center.
By integrating the output of the charge amplifier 6 up to
S1) is calculated. The determination circuit 72 determines that a misfire has occurred when the area ratio is less than a predetermined value, for example 1.2, and displays the display circuit 73.
Sends a misfire signal to Conversely, if it is 1.2 or more, it is determined that combustion is normal, and a normal signal is sent to the display circuit 73. The display circuit 73 has, for example, four LEDs, and based on the misfire signal and crank angle signal K, the display circuit 73 displays the L corresponding to the misfired cylinder.
Turn on the ED.
【０００９】上記のように本実施例では４つの圧力セン
サ３を並列に１つのチャージアンプ４に接続し、チャー
ジアンプ４、アナログスイッチ回路６、燃焼異常判定回
路７を１つで各気筒に共用することができ、気筒による
異常判定にばらつきをなくすことができた。As described above, in this embodiment, four pressure sensors 3 are connected in parallel to one charge amplifier 4, and one charge amplifier 4, analog switch circuit 6, and combustion abnormality determination circuit 7 are shared by each cylinder. This made it possible to eliminate variations in abnormality determination depending on the cylinder.
【００１０】前記実施例ではアナログスイッチ回路６に
より上死点の前後を６０°毎の等間隔でシリンダ圧を検
出するようにしたが、これらのクランク角は内燃機関の
気筒数に応じて適当に選択すればよく、また、上死点の
前後で検出角度を変えてもよい。また、任意のクランク
角領域における圧力状態を検出するようにすることもで
きる。In the above embodiment, the analog switch circuit 6 detects the cylinder pressure at equal intervals of 60° before and after the top dead center, but these crank angles can be adjusted appropriately depending on the number of cylinders of the internal combustion engine. The detection angle may be changed before and after the top dead center. Further, it is also possible to detect the pressure state in an arbitrary crank angle range.
【００１１】[0011]
【発明の効果】本発明は、上記の構成を有し増幅器に各
気筒毎の圧力センサの出力を並列に接続して入力するよ
うにしたものであるから、増幅器、積分回路、演算判定
回路等を一つで済ますことができ部品点数を減少するこ
とができるという優れた効果がある。このため、コスト
の低減、故障率の減少、装置の小型化が実現できる。[Effects of the Invention] The present invention has the above-mentioned configuration, and the output of the pressure sensor for each cylinder is connected in parallel to the amplifier for input. This has the excellent effect of reducing the number of parts by requiring only one. Therefore, it is possible to reduce costs, reduce the failure rate, and downsize the device.
【図１】 燃焼状態監視装置を示すブロック図、[Figure 1] Block diagram showing the combustion condition monitoring device,
【図
２】 正常燃焼時と失火時とにおけるシリンダ内圧出
力の波形図[Figure 2] Waveform diagram of cylinder internal pressure output during normal combustion and misfire
１．．内燃機関、 ２．．スパークプラグ、 ３．
．圧力センサ、 ４．．チャージアンプ（増幅器）、
５．．クランク角センサ、 ６．．アナログスイ
ッチ回路（選択手段）、 ７．．燃焼異常判定回路（
異常判定手段）。1. ．． Internal combustion engine, 2. ．． Spark plug, 3.
．． pressure sensor, 4. ．． charge amplifier (amplifier),
5. ．． Crank angle sensor, 6. ．． Analog switch circuit (selection means), 7. ．． Combustion abnormality determination circuit (
abnormality determination means).
Claims (1)
圧をその圧力値に応じた電気信号に変換し検出する圧力
センサと、内燃機関のクランク角を検出するクランク角
センサと、前記各気筒毎の圧力センサの出力が並列に接
続されて入力される増幅器と、前記クランク角センサか
らの信号に基づき各気筒の上死点前後の所定期間だけ前
記増幅器からの出力信号を通す選択手段と、前記クラン
ク角センサからの信号と前記選択手段からの増幅器出力
信号に基づき、上死点前後の増幅器出力信号の処理値か
ら当該気筒の失火等の燃焼異常を判定する異常判定手段
と、を備えることを特徴とする多気筒内燃機関の燃焼状
態監視装置。1. A pressure sensor provided for each cylinder that converts and detects the cylinder internal pressure of each cylinder into an electrical signal corresponding to the pressure value; a crank angle sensor that detects the crank angle of an internal combustion engine; an amplifier connected in parallel to receive the outputs of the pressure sensors; a selection means for passing the output signal from the amplifier for a predetermined period before and after the top dead center of each cylinder based on the signal from the crank angle sensor; Abnormality determination means for determining combustion abnormality such as misfire in the cylinder from processed values of the amplifier output signal before and after top dead center based on the signal from the crank angle sensor and the amplifier output signal from the selection means. Features: Combustion status monitoring device for multi-cylinder internal combustion engines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3949191A JPH04259669A (en) | 1991-02-09 | 1991-02-09 | Combusting condition monitoring device for multi-cylinder internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3949191A JPH04259669A (en) | 1991-02-09 | 1991-02-09 | Combusting condition monitoring device for multi-cylinder internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04259669A true JPH04259669A (en) | 1992-09-16 |
Family
ID=12554524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3949191A Pending JPH04259669A (en) | 1991-02-09 | 1991-02-09 | Combusting condition monitoring device for multi-cylinder internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04259669A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2514656A (en) * | 2013-03-18 | 2014-12-03 | Ulc Robotics Inc | System for extracting liquid from a pipeline and method for producing such a system |
| US11047326B2 (en) | 2019-03-29 | 2021-06-29 | Toyota Jidosha Kabushiki Kaisha | Misfire detection device for internal combustion engine, misfire detection system for internal combustion engine, data analyzer, controller for internal combustion engine, method for detecting misfire in internal combustion engine, and reception execution device |
| US11268469B2 (en) | 2019-03-29 | 2022-03-08 | Toyota Jidosha Kabushiki Kaisha | Misfire detection device for internal combustion engine, misfire detection system for internal combustion engine, data analysis device, controller for internal combustion engine, method for detecting misfire of internal combustion engine, and reception execution device |
| US11319891B2 (en) | 2019-03-29 | 2022-05-03 | Toyota Jidosha Kabushiki Kaisha | Misfire detection device for internal combustion engine, misfire detection system for internal combustion engine, data analyzer, controller for internal combustion engine, method for detecting misfire of internal combustion engine, and reception execution device |
-
1991
- 1991-02-09 JP JP3949191A patent/JPH04259669A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2514656A (en) * | 2013-03-18 | 2014-12-03 | Ulc Robotics Inc | System for extracting liquid from a pipeline and method for producing such a system |
| US11047326B2 (en) | 2019-03-29 | 2021-06-29 | Toyota Jidosha Kabushiki Kaisha | Misfire detection device for internal combustion engine, misfire detection system for internal combustion engine, data analyzer, controller for internal combustion engine, method for detecting misfire in internal combustion engine, and reception execution device |
| US11268469B2 (en) | 2019-03-29 | 2022-03-08 | Toyota Jidosha Kabushiki Kaisha | Misfire detection device for internal combustion engine, misfire detection system for internal combustion engine, data analysis device, controller for internal combustion engine, method for detecting misfire of internal combustion engine, and reception execution device |
| US11319891B2 (en) | 2019-03-29 | 2022-05-03 | Toyota Jidosha Kabushiki Kaisha | Misfire detection device for internal combustion engine, misfire detection system for internal combustion engine, data analyzer, controller for internal combustion engine, method for detecting misfire of internal combustion engine, and reception execution device |
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