JPH04101048A - Infrared temperature detection type combustion abnormality judging method - Google Patents
Infrared temperature detection type combustion abnormality judging methodInfo
- Publication number
- JPH04101048A JPH04101048A JP21732890A JP21732890A JPH04101048A JP H04101048 A JPH04101048 A JP H04101048A JP 21732890 A JP21732890 A JP 21732890A JP 21732890 A JP21732890 A JP 21732890A JP H04101048 A JPH04101048 A JP H04101048A
- Authority
- JP
- Japan
- Prior art keywords
- engine
- cylinder
- temperature
- combustion abnormality
- average 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.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 27
- 230000005856 abnormality Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 12
- 238000001514 detection method Methods 0.000 title claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000013011 mating Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、自動車エンジンの試運転などにおいて燃焼異
常を判定する方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for determining combustion abnormality during a test run of an automobile engine.
従来の技術
自動車のエンジン、例えばガソリンエンジンを試運転す
る際に、燃焼異常を見つける方法としては、音や振動を
測定したり、エンジン出力のムラを測定したり、さらに
は排気ガスの色を見たり、排気ガス中のガス酸分を測定
したりする方法が考えられる。Conventional technology When test running a car engine, such as a gasoline engine, methods for detecting combustion abnormalities include measuring sound and vibration, measuring unevenness in engine output, and even looking at the color of exhaust gas. Possible methods include measuring the gas acid content in exhaust gas.
発明が解決しようとする課題
しかしながら、これらの方法は測定装置をエンジンに接
触させる必要があったり、測定に時間がかかったり、測
定に十分な精度が得られなかったり、また、複数の気筒
のうち、どの気筒に燃焼異常があるかを判定できなかっ
たりするものであった。Problems to be Solved by the Invention However, these methods require the measurement device to be brought into contact with the engine, take time to measure, do not provide sufficient accuracy in measurement, and have problems with only one cylinder being connected to the engine. , it may not be possible to determine which cylinder has a combustion abnormality.
本発明は、以上の問題点を解決するために威されたもの
で、直接エンジンに接触することなく、瞬時に、十分な
精度をもって、どの気筒に燃焼異常があるかを判定する
ことのできる燃焼異常判定方法を提供することを目的と
する。The present invention was developed to solve the above problems, and is a combustion engine that can instantly and with sufficient accuracy determine which cylinder has a combustion abnormality without directly contacting the engine. The purpose is to provide an abnormality determination method.
課題を解決するための手段
本発明は、以上の目的を達成するために成されたもので
、自動車エンジンの各気筒の排気ポートに赤外線温度計
のセンサを近づけ、検知されたエンジン点火前後の温度
差が、設定された下限値以下の場合に、燃焼異常と判断
するものである。Means for Solving the Problems The present invention has been made to achieve the above-mentioned objects.The present invention has been made to achieve the above-mentioned object.The present invention is made by bringing an infrared thermometer sensor close to the exhaust port of each cylinder of an automobile engine, and measuring the detected temperature before and after ignition of the engine. If the difference is less than or equal to a set lower limit value, it is determined that combustion is abnormal.
作用
エンジン試運転の際、赤外線温度計のセンサは排気ポー
トに近づけて位置させれば良く、エンジンに接触させる
必要がない。また、温度の検知は瞬時に、正確に行われ
る。各気筒に赤外線温度計をセットすることで、どの気
筒に燃焼異常があるかを容易に判定できる。Operation During engine commissioning, the infrared thermometer sensor only needs to be located close to the exhaust port and does not need to be in contact with the engine. Additionally, temperature detection is instantaneous and accurate. By setting an infrared thermometer in each cylinder, it is easy to determine which cylinder has a combustion abnormality.
実施例
以下、本発明の一実施例を第1図及び第2図において説
明する。第1図は温度が検知される部位を示すエンジン
の縦断面図、第2図は温度の検知により燃焼異常を判定
する判定手順を示すフローチャートである。EXAMPLE Hereinafter, an example of the present invention will be explained with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of the engine showing the portions where temperature is detected, and FIG. 2 is a flowchart showing a determination procedure for determining combustion abnormality based on temperature detection.
第1図は、複数の気筒を備えた自動車のガソリンエンジ
ンの1つの気筒の部分のみを示す部分断面図である。各
気筒におけるシリンダブロックIの上部に設けられたシ
リンダヘッド2に形成されている排気ポート3には、エ
キゾーストマニホールド5が接続されている。本発明に
よると、赤外線温度計6のセンサ7は、このエキゾース
トマニホールド5とシリンダヘッド排気ボート3との合
せ面9から例えば約3M1Rの位置に近づけてセットす
る。このセットは、センサ7をクランプして正確に近づ
け得る治具によって行われる。なお、11はシリンダヘ
ッド2に形成された吸気ボート、13は吸気ポート11
に接続されるインテークマニホールド、15はインテー
クマニホールド13に設けられ燃料の一部を噴射するイ
ンジェクタ、21は吸気7\ルブ17と排気バルブ19
とに狭まれた位置に設けられたスパークプラグである。FIG. 1 is a partial cross-sectional view showing only one cylinder of a gasoline engine for an automobile having a plurality of cylinders. An exhaust manifold 5 is connected to an exhaust port 3 formed in a cylinder head 2 provided at the top of a cylinder block I in each cylinder. According to the present invention, the sensor 7 of the infrared thermometer 6 is set close to, for example, a position of about 3M1R from the mating surface 9 of the exhaust manifold 5 and the cylinder head exhaust boat 3. This setting is performed using a jig that can clamp the sensor 7 and bring it closer accurately. Note that 11 is an intake boat formed in the cylinder head 2, and 13 is an intake port 11.
15 is an injector installed in the intake manifold 13 and injects a portion of the fuel; 21 is an intake valve 17 and an exhaust valve 19;
This is a spark plug installed in a narrow position between the two.
生産されたエンジンは試運転され、燃焼異常、すなわち
完全失火あるいは断続失火があるか否かが判定される。The produced engines are tested and it is determined whether there are combustion abnormalities, ie, complete misfires or intermittent misfires.
この燃焼異常は、前記スパークプラグ21のギャップが
小さ過ぎたり、インジェクタ15の作動不良等を原因と
して生じる。This combustion abnormality occurs due to the gap of the spark plug 21 being too small, malfunction of the injector 15, or the like.
この燃焼異常は、エンジンを点火して一定時間経過後に
十分に温度上昇が成されるか否かによって判定し得る。This combustion abnormality can be determined by whether or not the temperature has risen sufficiently after a certain period of time has elapsed since the engine was ignited.
すなわち、正常に働いている気筒と、燃焼異常を起こし
ている気筒では温度上昇に差が生じる。従って、エンジ
ンを点火して始動した後の一定時間経過時に、排気ポー
ト付近の温度を測定し、温度上昇が、設定された下限値
以下の場合には燃焼異常と判定することができる。That is, there is a difference in temperature rise between a cylinder that is working normally and a cylinder that is experiencing combustion abnormality. Therefore, after a certain period of time has elapsed after the engine has been ignited and started, the temperature near the exhaust port can be measured, and if the temperature rise is below a set lower limit value, it can be determined that combustion is abnormal.
次に、本発明における燃焼異常判定手順を第2図のフロ
ーチャートを基に詳しく説明する。Next, the combustion abnormality determination procedure according to the present invention will be explained in detail based on the flowchart of FIG.
生産されたエンジンは試運転装置へ搬入され、位置決め
が行われる。赤外線温度計6を気筒の数だけ用意し、各
温度計6のセンサ7を、図示しない治具によりエキゾー
ストマニホールド5のシリンダヘッド排気ボート3との
合せ面9より約3imの位置に近づけてセットする。セ
ットが終った後、温度の検知を開始する。そして、各気
筒毎に、同じ時点から1秒間の温度を連続して検知し、
その平均値を記憶する。その後、エンジンを点火し始動
する。このエンジン始動から10秒たった時点からさら
に1秒間の温度を連続して検知し、その平均値を記憶す
る。そして、判定器23において、エンジン点火前の温
度平均値と、エンジン始動後の温度平均値の温度差を各
気筒毎に計算する。そして、これら各気筒毎に計算され
た温度差が、設定された温度差の下限値よりも小さいか
大きいかを比較する。実際の温度差が下限値よりも小さ
ければ、排気ポート付近の温度が十分に上昇しなかった
ことになり、その気筒に燃焼異常かあると判定される。The produced engine is transported to a test run facility and positioned. Prepare as many infrared thermometers 6 as there are cylinders, and set the sensor 7 of each thermometer 6 using a jig (not shown) at a position approximately 3 mm closer to the mating surface 9 of the exhaust manifold 5 with the cylinder head exhaust boat 3. . After the set is complete, temperature detection begins. Then, for each cylinder, the temperature is continuously detected for 1 second from the same point in time,
The average value is memorized. Then, ignite and start the engine. After 10 seconds have elapsed since the engine was started, the temperature is continuously detected for another 1 second, and the average value is stored. Then, the determiner 23 calculates the temperature difference between the average temperature before engine ignition and the average temperature after engine startup for each cylinder. Then, a comparison is made to see whether the temperature difference calculated for each cylinder is smaller or larger than a set lower limit value of the temperature difference. If the actual temperature difference is smaller than the lower limit value, this means that the temperature near the exhaust port has not risen sufficiently, and it is determined that there is a combustion abnormality in that cylinder.
この判定があったときは、警報器25によりその旨の警
報か出される。また、各気筒とも、実際の温度差が下限
値よりも大きければ、燃焼か正常であると判定される。When this determination is made, the alarm 25 issues an alarm to that effect. Further, if the actual temperature difference in each cylinder is larger than the lower limit value, it is determined that combustion is normal.
以上説明したように、本発明によれば、赤外線温度計6
は各気筒毎にセットされるので、複数の気筒のうち、ど
の気筒に異常があるかが容易に判定される。また、赤外
線温度計6はそのセンサ7を試運転エンジンに接触させ
ずにセットすることができ、判定作業が容易である。さ
らに、赤外線温度計6は瞬時に十分な精度をもって温度
の検知を行え、十分正確に各気筒の燃焼異常を判定でき
る。As explained above, according to the present invention, the infrared thermometer 6
is set for each cylinder, so it is easy to determine which cylinder among the plurality of cylinders has an abnormality. Furthermore, the infrared thermometer 6 can be set without having its sensor 7 come into contact with the test run engine, making the determination work easy. Furthermore, the infrared thermometer 6 can detect temperature instantaneously and with sufficient accuracy, and can determine combustion abnormality in each cylinder with sufficient accuracy.
発明の詳細
な説明したように、本発明の赤外線温度検知式燃焼異常
判定方法によれば、各気筒の排気ポート付近の温度を赤
外線温度計により検知し、エンジン点火によって十分に
温度が上がらなかった気簡に燃焼異常があると判断する
ので、どの気筒に燃焼異常があるかを瞬時に十分な精度
をもって、しかもエンジンに接触しないで判定すること
ができる。As described in detail, according to the infrared temperature detection type combustion abnormality determination method of the present invention, the temperature near the exhaust port of each cylinder is detected by an infrared thermometer, and the temperature does not rise sufficiently by engine ignition. Since it is easily determined that there is a combustion abnormality, it is possible to instantly determine which cylinder has a combustion abnormality with sufficient accuracy, and without contacting the engine.
第1図は本発明の一実施例に係る赤外線温度検知式燃焼
異常判定方法に用いる装置を示す概略図、第2図は第1
図の装置を用いて行う判定手順を示すフローチャートで
ある。
3・・排気ボート、5・・エキゾーストマニホールド、
6・・赤外線温度計、7・・センサ、9・・合せ面、2
3・・判定器、25・・警報器。FIG. 1 is a schematic diagram showing an apparatus used in an infrared temperature detection type combustion abnormality determination method according to an embodiment of the present invention, and FIG.
3 is a flowchart showing a determination procedure performed using the device shown in the figure. 3. Exhaust boat, 5. Exhaust manifold,
6. Infrared thermometer, 7. Sensor, 9. Matching surface, 2
3... Judgment device, 25... Alarm device.
Claims (1)
センサを近づけ、検知されたエンジン点火前後の温度差
が、設定された下限値以下の場合に、燃焼異常と判断す
ることを特徴とする赤外線温度検知式燃焼異常判定方法
。An infrared temperature sensor is brought close to the exhaust port of each cylinder of an automobile engine, and if the detected temperature difference before and after engine ignition is less than a set lower limit value, it is determined that combustion is abnormal. Detection type combustion abnormality determination method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21732890A JPH04101048A (en) | 1990-08-17 | 1990-08-17 | Infrared temperature detection type combustion abnormality judging method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21732890A JPH04101048A (en) | 1990-08-17 | 1990-08-17 | Infrared temperature detection type combustion abnormality judging method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04101048A true JPH04101048A (en) | 1992-04-02 |
Family
ID=16702459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21732890A Pending JPH04101048A (en) | 1990-08-17 | 1990-08-17 | Infrared temperature detection type combustion abnormality judging method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04101048A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013194649A (en) * | 2012-03-21 | 2013-09-30 | Denso Corp | Fuel injection valve inspection device |
-
1990
- 1990-08-17 JP JP21732890A patent/JPH04101048A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013194649A (en) * | 2012-03-21 | 2013-09-30 | Denso Corp | Fuel injection valve inspection device |
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