JPS6254138A - Misfire discriminating device for engine - Google Patents
Misfire discriminating device for engineInfo
- Publication number
- JPS6254138A JPS6254138A JP60194596A JP19459685A JPS6254138A JP S6254138 A JPS6254138 A JP S6254138A JP 60194596 A JP60194596 A JP 60194596A JP 19459685 A JP19459685 A JP 19459685A JP S6254138 A JPS6254138 A JP S6254138A
- Authority
- JP
- Japan
- Prior art keywords
- misfire
- value
- intake pressure
- engine
- air pressure
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 1
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Testing Of Engines (AREA)
Abstract
Description
【発明の詳細な説明】
く技術分野〉
本発明は、主としてガス機関やディーゼル機関等の多気
筒内燃機関において気筒での失火発生を判定する失火判
定装置に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention mainly relates to a misfire determination device that determines the occurrence of a misfire in a cylinder in a multi-cylinder internal combustion engine such as a gas engine or a diesel engine.
〈従来技術〉
従来、機関の失火状態は、排気温度により判定されてい
た。<Prior Art> Conventionally, the misfire state of an engine has been determined based on the exhaust temperature.
具体的には、予め一定の失火排気温度の基準値 。Specifically, a predetermined reference value for the misfire exhaust temperature.
を設定しておき、排気温度がこの基準値を下回ったとき
に、失火が発生したと判定する方式と、各気筒の排気温
度と全気筒の排気温度の平均値とを比較して失火を判定
する方式とがあった。This method determines that a misfire has occurred when the exhaust temperature falls below this reference value, and the system determines whether a misfire has occurred by comparing the exhaust temperature of each cylinder with the average value of the exhaust temperature of all cylinders. There was a method to do this.
しかしながら、曲者の方式では、負荷量に応じて排気温
度が上下に大きく変動するために、負荷量に対応して互
いに異なるレベルの複数の基準値を設定しておく必要が
あった。このように機関毎に負荷量に対応する失火基準
値を設定するのは、面倒な作業で、多大な時間と労力を
要した。However, in the curved method, since the exhaust gas temperature fluctuates significantly up and down depending on the amount of load, it is necessary to set a plurality of reference values at different levels depending on the amount of load. Setting the misfire reference value corresponding to the load amount for each engine in this way is a tedious task and requires a great deal of time and effort.
また、後者の方式では、各気筒の排気管に温度センサを
取り付けなければならず、気筒数と同数の温度センサが
必要であり、そのためコストがかさむという欠点があっ
た。Furthermore, in the latter method, a temperature sensor must be attached to the exhaust pipe of each cylinder, and the same number of temperature sensors as the number of cylinders is required, which has the disadvantage of increasing costs.
〈発明の目的〉
本発明は、上記従来の問題点に鑑みてなされたものであ
って、数少ないセンサを用いて、失火判定レベルを変更
することなく簡単な判定動作により失火状態の判定を行
なえるようにすることを目的とする。<Purpose of the Invention> The present invention has been made in view of the above-mentioned conventional problems, and is capable of determining a misfire state by a simple determination operation using a small number of sensors and without changing the misfire determination level. The purpose is to do so.
〈発明の構成〉
さて、本件発明者が検討したところでは、機関のいずれ
かの気筒で失火が発生すると、機関の吸気圧が正常運転
時より増大するという事実がある。<Structure of the Invention> The inventor of the present invention has investigated the fact that when a misfire occurs in any cylinder of the engine, the intake pressure of the engine increases compared to during normal operation.
すなわち、いずれかの気筒での失火発生により、機関全
体の出力が瞬間的に低下するが、機関にはガバナが装備
されていて、該ガバナが機関の回転数を所定の設定回転
数に戻すように働くので、失火が発生していない気筒は
、その時の負荷に対応するために、失火発生前よりも多
くの仕事をすることになり、ガバナの調速動作によりス
ロットルか開き、これによって気筒への吸気圧が増大す
るのである。In other words, if a misfire occurs in any cylinder, the output of the entire engine will drop momentarily, but the engine is equipped with a governor, and the governor will return the engine speed to a predetermined set speed. Therefore, cylinders that have not experienced a misfire will have to do more work than before the misfire in order to cope with the load at that time, and the governor will open the throttle due to the speed control operation, which will cause the cylinder to The intake pressure of the engine increases.
本発明は、上記の知見に基づいて前記の目的を達成しよ
うとする乙のであって、第１図の機能ブロック図に示す
ように、機関Ａの吸気圧を検出する手段Ｂと、負荷を検
出する手段Ｃと、正常運転時における負荷と吸気圧との
対応関係を記憶する記憶手段りと、該記憶手段りから前
記負荷検出手段Ｃによる負荷検出値に対応する吸気圧値
を検索する検索手段Ｅと、該検索手段Ｅからの吸気圧の
検索値と吸気圧検出手段Ｂによる検出値とを比較して失
火状態を判別する判別手段Ｆと、該判別手段Ｆの失火判
別出力に応答して失火状態の継続時間を計測する計測手
段Ｇと、失火状態が一定時間継続したことを示す前記計
測手段Ｇのタイムアツプ出力に応答して失火発生を示す
失火信号を出力する出力手段Ｈとを備えて機関の失火判
定装置を構成した。The present invention is an attempt to achieve the above object based on the above knowledge, and as shown in the functional block diagram of FIG. a storage means for storing the correspondence between the load and the intake pressure during normal operation; and a search means for searching the storage means for an intake pressure value corresponding to the load detection value by the load detection means C. E, a determining means F for determining a misfire state by comparing the searched value of the intake pressure from the searching means E and the value detected by the intake pressure detecting means B; A measuring means G for measuring the duration of the misfire state, and an output means H for outputting a misfire signal indicating the occurrence of a misfire in response to a time-up output of the measuring means G indicating that the misfire state has continued for a certain period of time. A misfire detection device for the engine was constructed.
〈実施例〉
以下、本発明を図面に示す実施例に基づいて詳細に説明
する。第２図は、本発明の一実施例であるガス機関の失
火判定装置のブロック図であって、該失火判定装置は、
多気筒のガス機関１と、制御部２と、吸気圧の検出手段
である吸気圧センサ３と、負荷検出手段モある電カドラ
ンスデューサ４とを備える。<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings. FIG. 2 is a block diagram of a misfire determination device for a gas engine which is an embodiment of the present invention, and the misfire determination device includes:
The engine includes a multi-cylinder gas engine 1, a control section 2, an intake pressure sensor 3 serving as an intake pressure detection means, and an electric quadrature transducer 4 serving as a load detection means.
前記吸気圧センサ３は、機関ｌの吸気マニホールド５に
取り付けられている。機関１の主軸には、 発電機６が
直結され、該発電機６に前記電カドランスデューサ４が
装着されている。第２図において、符号７はスロットル
、８はガバナ、９はミキサである。The intake pressure sensor 3 is attached to an intake manifold 5 of the engine l. A generator 6 is directly connected to the main shaft of the engine 1, and the electric quadrature transducer 4 is attached to the generator 6. In FIG. 2, numeral 7 is a throttle, 8 is a governor, and 9 is a mixer.
また、前記制御部２は、吸気圧センサ３と電カドランス
デューサ４とによる雨検出信号に基づいて失火を判定す
るものであって、第１図に示した記憶手段りと検索手段
Ｅと失火状態判別手段Ｆと計測手段Ｇと失火信号出力手
段Ｈとを機能的に有する。該制御部２はｃｐｕｔｏと、
ＲＯＭＩＩと、ＲＡＭ１２と、入出力ボート１３と、Ａ
／Ｄコンバータ１４とを備えている。前記Ａ／Ｄコンバ
ータ１４には、前記吸気圧センサ３の検出信号と電カド
ランスデューサ４の検出信号とが予札ぞれ増幅器１５．
１６を通じて入力し、また入出力ボート１３からは、Ｃ
ＰＵ １０で生成された失火信号が出力されるようにな
っている。Further, the control unit 2 determines whether a misfire has occurred based on a rain detection signal from the intake pressure sensor 3 and the electric quadrangle transducer 4. It functionally includes a state determining means F, a measuring means G, and a misfire signal output means H. The control unit 2 includes cputo,
ROMII, RAM 12, input/output board 13, and A
/D converter 14. The A/D converter 14 receives the detection signal of the intake pressure sensor 3 and the detection signal of the electric quadrature transducer 4 through an amplifier 15.
16 and from the input/output port 13.
A misfire signal generated by the PU 10 is output.
次に上記構成の動作を第３図のフローヂャートに基づい
て説明する。まず、ステップＳｌにおいて、吸気圧セン
サ３による吸気圧検出値と、電カドランスデューサ４に
よる負荷検出値とをＡ／Ｄコンバータ！４を通じて読み
取り、一旦ＲＡ Ｍ １２に記憶する。ステップＳ２で
は、ＲＯＭＩＩに記憶されている数表から前記負荷検出
値に対応する吸気圧の値を検索する。該ｒＺＯＭ１１に
は、正常運転時における負荷量とこれに対応する吸気圧
とが数表の形で予め記憶されている。Next, the operation of the above configuration will be explained based on the flowchart of FIG. First, in step Sl, the intake pressure detected by the intake pressure sensor 3 and the load detected by the electric quadrature transducer 4 are converted into an A/D converter! 4 and temporarily stores it in RAM 12. In step S2, the value of the intake pressure corresponding to the detected load value is searched from the numerical table stored in the ROMII. The rZOM 11 stores in advance the load amount and the corresponding intake pressure during normal operation in the form of a numerical table.
次のステップＳ３では、吸気圧の検出値と検索値との偏
差ｅを算出し、ステップＳ４で、この偏差ｅを一定の基
準値ｅ。と比較する。これら両ステップは、実際の吸気
圧（検出値）が正常運転時の吸気圧（検索値）から大き
く外れているか否かを判断するものであって、偏差ｅが
基準値ｅ０を越えていれば、それは、実際の吸気圧が正
常運転時の吸気圧から大きく外れていることであり、そ
の場合は、いずれかの気筒で失火が発生している可能性
がある。In the next step S3, a deviation e between the detected value and the search value of the intake pressure is calculated, and in step S4, this deviation e is set to a constant reference value e. Compare with. These two steps are for determining whether the actual intake pressure (detected value) deviates significantly from the intake pressure during normal operation (search value), and if the deviation e exceeds the reference value e0, This means that the actual intake pressure deviates significantly from the intake pressure during normal operation, and in that case, there is a possibility that a misfire has occurred in one of the cylinders.
ここで直ちに失火が発生したとの判定を行なってもよい
のであるが、電気的ノイズ等の原因により基準値ｅ。を
越える偏差ｅが現われていることが考えられる。そこで
、ステップＳ４で偏差ｅが基準値ｅ。を越えているとの
判断がなされると、ステップＳ５に移って、失火状態の
継続時間を示す失火状態変数ｊをアップカウントする。At this point, it may be determined that a misfire has occurred immediately, but the reference value e may be determined due to electrical noise or other causes. It is conceivable that a deviation e exceeding . Therefore, in step S4, the deviation e is set to the reference value e. If it is determined that the misfire condition has exceeded the period of time, the process moves to step S5, and a misfire condition variable j indicating the duration of the misfire condition is counted up.
ステップＳ４で偏差ｅが基準値ｅ。に達していないと判
断されれば、ステップＳ６に進んで、それまでにカウン
トされた失火状態変数ｊを「０」に戻す。In step S4, the deviation e is set to the reference value e. If it is determined that the misfire status variable j has not been reached, the process advances to step S6, and the misfire status variable j counted up to that point is returned to "0".
ステップＳ５の次のステップＳ７では、失火状態変敗ｊ
が一定値、たとえば「１０」に達したか否かを判断し、
失火状態変数ｊが一定値に達すれば、実際の吸気圧が正
常運転時での吸気圧から大きく外れた状態が一定時間継
続することなるから、確実に失火が発生したとして、ス
テップＳ８に進んで、失火信号を出力する。この失火信
号により表示器に失火発生の表示がなされたり、警報器
が鳴動じたりする。In step S7 following step S5, the misfire state change j
determines whether it has reached a certain value, for example "10",
If the misfire status variable j reaches a certain value, the actual intake pressure will continue to deviate significantly from the intake pressure during normal operation for a certain period of time, so it is assumed that a misfire has definitely occurred, and the process proceeds to step S8. , outputs a misfire signal. This misfire signal causes a display to indicate that a misfire has occurred or an alarm to sound.
上記の実施例では、負荷検出手段として電力トランスデ
ユーサ４を用いたが、ヒートポンプの駆動に使用される
機関では、コンプレッサの吐出圧センサを負荷検出手段
とすることができ、負荷検出手段は図示の例に限定され
ない。In the above embodiment, the power transducer 4 was used as the load detection means, but in an engine used to drive a heat pump, the discharge pressure sensor of the compressor can be used as the load detection means, and the load detection means is not shown. The example is not limited to.
〈発明の効果〉
以上のように、本発明によれば、負荷検出手段と吸気圧
検出手段とを用いて失火の判定を行なうことができ、検
出手段の数が２つで済むから、装置を低コストで製造す
ることができる。<Effects of the Invention> As described above, according to the present invention, a misfire can be determined using the load detection means and the intake pressure detection means, and the number of detection means is only two. Can be manufactured at low cost.
しかも、負荷の状態により失火判定のレベル（基準値）
を変更する必要がないから、簡単な判定動作により確実
に失火の判定を行なうことができるばかりでなく、負荷
量に応じた複数の失火判定レベルを予め設定しておく面
倒な作業が不要で、その設定作業のための多大な労力や
時間を必要としない。Moreover, the misfire judgment level (standard value) depends on the load condition.
Since there is no need to change the misfire detection level, it is not only possible to reliably judge a misfire with a simple judgment operation, but also eliminates the troublesome work of setting multiple misfire judgment levels in advance according to the amount of load. No great effort or time is required for the setting work.
第１図は本発明の構成を明示する機能ブロック図、第２
図は本発明の一実施例のブロック図、第３図はその失火
判定動作を示すフローチャートである。
１・・・機関、２・・・制御部、３・・・吸気圧センサ
（吸気圧検出手段）、４・・電カドランスデューサ（負
荷検出手段）。
出願人 ヤンマーディーゼル株式会社代゛理人 弁
理士 岡 １）和 秀
第１図
第２図
第３図Figure 1 is a functional block diagram that clearly shows the configuration of the present invention, Figure 2 is a functional block diagram clearly showing the configuration of the present invention.
The figure is a block diagram of an embodiment of the present invention, and FIG. 3 is a flowchart showing the misfire determination operation. DESCRIPTION OF SYMBOLS 1... Engine, 2... Control part, 3... Intake pressure sensor (intake pressure detection means), 4... Electric quadrature transducer (load detection means). Applicant Yanmar Diesel Co., Ltd. Attorney Patent Attorney Oka 1) Hide Kazu Figure 1 Figure 2 Figure 3
Claims (1)
手段と、正常運転時における負荷と吸気圧との対応関係
を記憶する記憶手段と、該記憶手段から前記負荷検出手
段による負荷検出値に対応する吸気圧値を検索する検索
手段と、該検索手段からの吸気圧の検索値と吸気圧検出
手段による検出値とを比較して失火状態を判別する判別
手段と、該判別手段の失火判別出力に応答して失火状態
の継続時間を計測する計測手段と、失火状態が一定時間
継続したことを示す前記計測手段のタイムアップ出力に
応答して失火発生を示す失火信号を出力する出力手段と
を備えたことを特徴とする機関の失火判定装置。(1) Means for detecting the intake pressure of the engine, means for detecting the load, storage means for storing the correspondence between the load and the intake pressure during normal operation, and load detection by the load detection means from the storage means. a search means for searching for an intake pressure value corresponding to the intake pressure value; a determining means for determining a misfire state by comparing the retrieved value of the intake pressure from the searching means with a value detected by the intake pressure detecting means; A measuring means for measuring the duration of a misfire state in response to a misfire determination output, and an output for outputting a misfire signal indicating the occurrence of a misfire in response to a time-up output of the measuring means indicating that the misfire state has continued for a certain period of time. A misfire determination device for an engine, comprising: means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60194596A JPS6254138A (en) | 1985-09-02 | 1985-09-02 | Misfire discriminating device for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60194596A JPS6254138A (en) | 1985-09-02 | 1985-09-02 | Misfire discriminating device for engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6254138A true JPS6254138A (en) | 1987-03-09 |
| JPH0355776B2 JPH0355776B2 (en) | 1991-08-26 |
Family
ID=16327172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60194596A Granted JPS6254138A (en) | 1985-09-02 | 1985-09-02 | Misfire discriminating device for engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6254138A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02221659A (en) * | 1989-02-23 | 1990-09-04 | Honda Motor Co Ltd | Fuel injection control device for two-cycle engine |
| US5076098A (en) * | 1990-02-21 | 1991-12-31 | Nissan Motor Company, Limited | System for detecting combustion state in internal combustion engine |
| FR2700363A1 (en) * | 1993-01-08 | 1994-07-13 | Solex | Method and apparatus for detecting misfires of an internal combustion engine and controlled ignition |
| JP2009185611A (en) * | 2008-02-01 | 2009-08-20 | Toyota Motor Corp | Device for determining number of misfiring cylinders in internal combustion engine |
| JP2009191664A (en) * | 2008-02-12 | 2009-08-27 | Mitsubishi Heavy Ind Ltd | Abnormality diagnostic method and device of gas engine |
| JP2019120187A (en) * | 2018-01-04 | 2019-07-22 | トヨタ自動車株式会社 | Accidental fire detector of internal combustion engine |
-
1985
- 1985-09-02 JP JP60194596A patent/JPS6254138A/en active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02221659A (en) * | 1989-02-23 | 1990-09-04 | Honda Motor Co Ltd | Fuel injection control device for two-cycle engine |
| US5076098A (en) * | 1990-02-21 | 1991-12-31 | Nissan Motor Company, Limited | System for detecting combustion state in internal combustion engine |
| FR2700363A1 (en) * | 1993-01-08 | 1994-07-13 | Solex | Method and apparatus for detecting misfires of an internal combustion engine and controlled ignition |
| WO1994016209A1 (en) * | 1993-01-08 | 1994-07-21 | Solex | Process and apparatus for the detection of misfiring in a spark-ignition internal combustion engine |
| JP2009185611A (en) * | 2008-02-01 | 2009-08-20 | Toyota Motor Corp | Device for determining number of misfiring cylinders in internal combustion engine |
| JP2009191664A (en) * | 2008-02-12 | 2009-08-27 | Mitsubishi Heavy Ind Ltd | Abnormality diagnostic method and device of gas engine |
| JP2019120187A (en) * | 2018-01-04 | 2019-07-22 | トヨタ自動車株式会社 | Accidental fire detector of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0355776B2 (en) | 1991-08-26 |
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