JPH07158501A - Misfire detection device of internal combustion engine - Google Patents
Misfire detection device of internal combustion engineInfo
- Publication number
- JPH07158501A JPH07158501A JP5308197A JP30819793A JPH07158501A JP H07158501 A JPH07158501 A JP H07158501A JP 5308197 A JP5308197 A JP 5308197A JP 30819793 A JP30819793 A JP 30819793A JP H07158501 A JPH07158501 A JP H07158501A
- Authority
- JP
- Japan
- Prior art keywords
- misfire
- cylinder pressure
- crank angle
- inter
- detected
- 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
Landscapes
- Testing Of 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、内燃機関の失火検出装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a misfire detecting device for an internal combustion engine.
【０００２】[0002]
【従来の技術】従来の内燃機関の失火検出装置として、
筒内圧センサにより検出される筒内圧の最大値Ｐmax
や、筒内圧が最大値となるときのクランク角度（筒内圧
最大クランク角度）θpmaxを検出し、図６(a) に示すよ
うに、正常燃焼時と失火時とで、筒内圧最大値Ｐmax や
筒内圧最大クランク角度θpmaxにそれぞれ差ΔＰ，Δθ
を生じることから、これらに基づいて失火判定を行うよ
うにしたものがある。2. Description of the Related Art As a conventional misfire detection device for an internal combustion engine,
Maximum value Pmax of the in-cylinder pressure detected by the in-cylinder pressure sensor
Also, the crank angle (crank angle maximum crank angle) θpmax at which the in-cylinder pressure reaches its maximum value is detected, and as shown in Fig. 6 (a), the in-cylinder pressure maximum value Pmax and Differences in cylinder pressure maximum crank angle θpmax are ΔP and Δθ, respectively.
Therefore, there is a system in which misfire determination is performed based on these.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の内燃機関の失火検出装置においては、低負荷
域においては、図６(b) に示すように、正常燃焼時と失
火時とでの、筒内圧最大値Ｐmax の差（ΔＰ）や、筒内
圧最大クランク角度θpmaxの差（Δθ）が、共に、ΔＰ
≒０、Δθ≒０となることから、失火検出が困難になる
ことがあるという問題点があった。However, in such a conventional misfire detecting device for an internal combustion engine, in the low load region, as shown in FIG. 6 (b), there is a difference between normal combustion and misfire. , The difference between the maximum in-cylinder pressure values Pmax (ΔP) and the difference between the maximum in-cylinder pressure crank angle θpmax (Δθ) are both ΔP.
Since ≈0 and Δθ≈0, there is a problem that misfire detection may be difficult.
【０００４】本発明は、このような従来の問題点に鑑
み、低負荷域においても正確に失火検出を行い得るよう
にすることを目的とする。In view of the above conventional problems, it is an object of the present invention to enable accurate misfire detection even in a low load range.
【０００５】[0005]
【課題を解決するための手段】このため、本発明は、図
１に示すように、下記Ａ〜Ｄの手段を設けて、内燃機関
の失火検出装置を構成する。 Ａ）点火前の所定クランク角度θ1 にて筒内圧（Ｐ1 ）
を検出する点火前筒内圧検出手段 Ｂ）検出された点火前の筒内圧Ｐ1 に基づいて圧縮上死
点後の所定の失火判定クランク角度θINT における失火
判定基準圧ＰINT を設定する失火判定基準圧設定手段 Ｃ）圧縮上死点後の所定の失火判定クランク角度θINT
にて筒内圧（Ｐ2 ）を検出する失火判定時筒内圧検出手
段 Ｄ）検出された失火判定時の筒内圧Ｐ2 と前記失火判定
基準圧ＰINT とを比較して失火判定を行う失火判定手段Therefore, according to the present invention, as shown in FIG. 1, the following means A to D are provided to constitute a misfire detection device for an internal combustion engine. A) Cylinder pressure (P 1 ) at a predetermined crank angle θ 1 before ignition
B) Pre-ignition in-cylinder pressure detection means B) Misfire determination for setting a misfire determination reference pressure P INT at a predetermined crank angle θ INT after compression top dead center based on the detected in-cylinder pressure P 1 before ignition. Reference pressure setting means C) Predetermined misfire determination crank angle θ INT after compression top dead center
Cylinder pressure (P 2) misfire determination for performing misfire determination as compared to the engine misfire identification cylinder pressure detection means D) when determining the detected misfire cylinder pressure P 2 that detects and said misfire determination reference pressure P INT and at means
【０００６】[0006]
【作用】上記の構成においては、圧縮上死点後の所定の
失火判定クランク角度θINT にて筒内圧（Ｐ2 ）を検出
し、これを失火判定基準圧ＰINT と比較して、Ｐ2 ＜Ｐ
INT の場合に失火と判定する。但し、失火判定基準圧Ｐ
INT が固定であると、筒内圧センサの劣化や機関の経時
変化等の影響を受けて、誤判定することがあるので、点
火前の所定クランク角度θ1 にて筒内圧（Ｐ1 ）を検出
し、これに基づいて失火判定基準圧ＰINT を設定する。In the above structure, the predetermined amount after the compression top dead center is reached.
Misfire determination crank angle θINTAt cylinder pressure (P2) Is detected
Then, refer to this as the misfire determination reference pressure PINTCompared to P2<P
INTIn case of, it is judged as misfire. However, the misfire determination reference pressure P
INTIs fixed, deterioration of the cylinder pressure sensor and engine
As it may be erroneously determined due to the influence of changes, etc.
Predetermined crank angle θ before fire1At cylinder pressure (P1) Is detected
Then, based on this, the misfire determination reference pressure PINTTo set.
【０００７】[0007]
【実施例】以下に本発明の一実施例を説明する。図２は
システム構成を示している。機関制御用のコントロール
ユニット１は、マイクロコンピュータを内蔵し、各種セ
ンサからの信号に基づいて演算処理を行って、機関にお
ける燃料噴射量や点火時期などを制御する一方、クラン
ク角度検出用のクランク角センサ２や、機関の各気筒毎
に点火栓の取付座金として設けられた圧電式の筒内圧セ
ンサ３からの信号に基づいて、失火検出を行う。EXAMPLE An example of the present invention will be described below. FIG. 2 shows the system configuration. The control unit 1 for engine control has a built-in microcomputer and performs arithmetic processing based on signals from various sensors to control the fuel injection amount and ignition timing in the engine, while the crank angle for crank angle detection. Misfire detection is performed based on a signal from the sensor 2 or a piezoelectric in-cylinder pressure sensor 3 provided as a washer for mounting a spark plug for each cylinder of the engine.
【０００８】具体的には、図３に示す失火検出ルーチン
に従って、失火を検出し、所定の場合に警報ランプ４等
により警報を発する。図３の失火検出ルーチンについて
説明する。ステップ１（図にはＳ１と記してある。以下
同様）では、点火時期（点火進角）ＡＤＶを読込む。Specifically, a misfire is detected in accordance with the misfire detection routine shown in FIG. 3, and an alarm is issued by a warning lamp 4 or the like in a predetermined case. The misfire detection routine of FIG. 3 will be described. In step 1 (denoted as S1 in the figure, the same applies hereinafter), the ignition timing (ignition advance angle) ADV is read.
【０００９】ステップ２では、点火時期ＡＤＶに基づい
て点火前の所定クランク角度θ1 （ＢＴＤＣ）を次式に
より求める。ｘは一定角度である。 θ1 ＝ＡＤＶ＋ｘ ステップ３では、クランク角センサからの信号に基づい
て現在のクランク角度θを読込んで、点火前の所定クラ
ンク角度θ1 （ＢＴＤＣ）か否かを判定し、θ＝θ1 と
なったときに次のステップ４へ進む。In step 2, the predetermined crank angle θ 1 (BTDC) before ignition is calculated based on the ignition timing ADV by the following equation. x is a constant angle. θ 1 = ADV + x In step 3, the current crank angle θ is read based on the signal from the crank angle sensor, and it is determined whether or not it is the predetermined crank angle θ 1 (BTDC) before ignition, and θ = θ 1 If so, go to the next step 4.
【００１０】ステップ４では、θ＝θ1 の時点（点火前
の所定クランク角度θ1 ）にて筒内圧センサからの信号
に基づいて筒内圧Ｐを検出して、これをＰ1 とする。ス
テップ５では、検出された点火前の筒内圧Ｐ1 に基づい
て圧縮上死点後の所定の失火判定クランク角度θ
INT （ＡＴＤＣ）における失火判定基準圧ＰINT を次式
により設定する。Ａは一定圧力である。In step 4, the in-cylinder pressure P is detected based on a signal from the in-cylinder pressure sensor at the time point of θ = θ 1 (predetermined crank angle θ 1 before ignition), and this is designated as P 1 . In step 5, a predetermined misfire determination crank angle θ after compression top dead center is determined based on the detected cylinder pressure P 1 before ignition.
The misfire determination reference pressure P INT at INT (ATDC) is set by the following equation. A is a constant pressure.
【００１１】ＰINT ＝Ｐ1 −Ａ ステップ６では、クランク角センサからの信号に基づい
て現在のクランク角度θを読込んで、圧縮上死点後の所
定の失火判定クランク角度θINT （ＡＴＤＣ）か否かを
判定し、θ＝θINT となったときに次のステップ７へ進
む。ステップ７では、θ＝θINT の時点（圧縮上死点後
の所定の失火判定クランク角度θINT ）にて筒内圧セン
サからの信号に基づいて筒内圧Ｐを検出して、これをＰ
2 とする。P INT = P 1 -A In step 6, the current crank angle θ is read based on the signal from the crank angle sensor to determine whether the predetermined misfire determination crank angle θ INT (ATDC) has been reached after the compression top dead center. It is determined whether or not, and when θ = θ INT , the process proceeds to the next step 7. In step 7, at the time of θ = θ INT (predetermined misfire determination crank angle θ INT after compression top dead center), the in-cylinder pressure P is detected based on the signal from the in-cylinder pressure sensor, and this is P
Set to 2 .
【００１２】ステップ８では、検出された失火判定時の
筒内圧Ｐ2 と失火判定基準圧ＰINTとを比較して失火判
定を行う。すなわち、Ｐ2 ≧ＰINT のときは、正常（失
火無し）と判定し、Ｐ2 ＜ＰINT のときは、失火と判定
する。Ｐ2 ≧ＰINT で、正常（失火無し）と判定したと
きは、ステップ９へ進んで気筒別の失火カウント値Ｃn
をクリアした後、本ルーチンを終了する。In step 8, a misfire determination is performed by comparing the detected in-cylinder pressure P 2 at the time of misfire determination with the misfire determination reference pressure P INT . That is, when P 2 ≧ P INT , it is determined to be normal (no misfire), and when P 2 <P INT , it is determined to be misfire. If P 2 ≧ P INT and normal (no misfire) is determined, the process proceeds to step 9 and the misfire count value C n for each cylinder is calculated.
After clearing, this routine ends.
【００１３】Ｐ2 ＜ＰINT で、失火と判定したときは、
ステップ10へ進んで気筒別の失火カウント値Ｃn を１ア
ップした後、ステップ11へ進んで気筒別の失火カウント
値Ｃ n を所定値（例えば２）と比較し、Ｃn ＜所定値の
場合は本ルーチンを終了するが、Ｃn ≧所定値の場合は
特定気筒の失火が連続しているためステップ12へ進んで
警報を発する。P2<PINTThen, when it is judged as misfire,
Go to step 10 and select misfire count value C for each cylinder.n1 a
And then go to step 11 to count misfires by cylinder.
Value C nIs compared with a predetermined value (for example, 2), and Cn<Predetermined value
If this routine ends, Cn≧ predetermined value
Since misfires in specific cylinders continue, proceed to step 12
Give an alarm.
【００１４】ここで、ステップ１〜４が点火前筒内圧検
出手段に相当し、ステップ５が失火判定基準圧設定手段
に相当し、ステップ６，７が失火判定時筒内圧検出手段
に相当し、ステップ８〜12が失火判定手段に相当する。
図４を参照して説明すれば、圧縮上死点（ＴＤＣ）後の
所定の失火判定クランク角度θINT にて筒内圧（Ｐ2 ）
を検出し、これを失火判定基準圧ＰINT と比較して、Ｐ
2 ＜ＰINT の場合に失火と判定するのである。但し、失
火判定基準圧Ｐ INT が固定であると、筒内圧センサの劣
化や機関の経時変化等の影響を受けて、誤判定すること
があるので、点火前の所定クランク角度θ1 にて筒内圧
（Ｐ1 ）を検出し、これに基づいて失火判定基準圧Ｐ
INT を設定するのである。Here, steps 1 to 4 are the cylinder pressure detection before ignition.
Corresponding to output means, step 5 is misfire determination reference pressure setting means
Steps 6 and 7 are means for detecting in-cylinder pressure at the time of misfire determination.
And steps 8 to 12 correspond to misfire determination means.
Referring to FIG. 4, after the compression top dead center (TDC),
Predetermined misfire determination crank angle θINTAt cylinder pressure (P2)
Is detected, and this is determined as the reference pressure P for misfire determination.INTCompared to P
2<PINTIn the case of, it is judged as misfire. However, lost
Fire judgment reference pressure P INTIs fixed, the cylinder pressure sensor
Misjudgment under the influence of changes in the organization and changes over time in the organization
Since there is a predetermined crank angle θ before ignition1At cylinder pressure
(P1) Is detected, and based on this, the misfire determination reference pressure P
INTIs set.
【００１５】尚、失火時に、失火判定クランク角度θ
INT における筒内圧が失火判定基準圧ＰINT より小さく
なるということは、圧縮上死点後の筒内圧がより早く失
火判定基準圧ＰINT まで低下するということであるか
ら、図５に示すように、圧縮上死点（ＴＤＣ）後に筒内
圧が失火判定基準圧ＰINT まで低下したときのクランク
角度（θ2 ）を検出し、これを失火判定クランク角度θ
INT と比較して、θ2 ≧θ INT のときは、正常（失火無
し）と判定し、θ2 ＜θINT のときは、失火と判定する
ようにしてもよい。At the time of misfire, misfire determination crank angle θ
INTCylinder pressure at is the misfire determination reference pressure PINTSmaller
This means that the cylinder pressure after compression top dead center is lost faster.
Fire judgment reference pressure PINTDoes that mean
As shown in FIG. 5, inside the cylinder after compression top dead center (TDC)
Pressure is misfire judgment reference pressure PINTCrank when lowered to
Angle (θ2) Is detected and the misfire determination crank angle θ
INTCompared to θ2≧ θ INTWhen normal, there is no misfire
)), Θ2<ΘINTWhen, it is judged as misfire
You may do it.
【００１６】[0016]
【発明の効果】以上説明したように本発明によれば、低
負荷域においても正確に失火検出を行うことができ、し
かも筒内圧センサの劣化や機関の経時変化等の影響を受
けることなく、精度の良い検出が可能になるという効果
が得られる。As described above, according to the present invention, it is possible to accurately detect a misfire even in a low load range, and further, without being affected by deterioration of the cylinder pressure sensor, deterioration of the engine over time, and the like. It is possible to obtain the effect of enabling accurate detection.
【図１】 本発明の構成を示す機能ブロック図FIG. 1 is a functional block diagram showing the configuration of the present invention.
【図２】 本発明の一実施例を示すシステム図FIG. 2 is a system diagram showing an embodiment of the present invention.
【図３】 失火検出ルーチンのフローチャートFIG. 3 is a flowchart of a misfire detection routine.
【図４】 失火検出の説明図FIG. 4 is an explanatory diagram of misfire detection.
【図５】 失火検出の他の説明図FIG. 5 is another explanatory diagram of misfire detection.
【図６】 従来の問題点を示す図FIG. 6 is a diagram showing conventional problems.
１ コントロールユニット ２ クランク角センサ ３ 筒内圧センサ ４ 警報ランプ 1 Control unit 2 Crank angle sensor 3 Cylinder pressure sensor 4 Alarm lamp
Claims (1)
出する点火前筒内圧検出手段と、 検出された点火前の筒内圧に基づいて圧縮上死点後の所
定の失火判定クランク角度における失火判定基準圧を設
定する失火判定基準圧設定手段と、 圧縮上死点後の所定の失火判定クランク角度にて筒内圧
を検出する失火判定時筒内圧検出手段と、 検出された失火判定時の筒内圧と前記失火判定基準圧と
を比較して失火判定を行う失火判定手段と、 を含んで構成される内燃機関の失火検出装置。1. A pre-ignition cylinder pressure detecting means for detecting a cylinder pressure at a predetermined crank angle before ignition, and a predetermined misfire determination crank angle after compression top dead center based on the detected cylinder pressure before ignition. Misfire determination reference pressure setting means for setting a misfire determination reference pressure, in-cylinder pressure detection means for detecting in-cylinder pressure at a predetermined misfire determination crank angle after compression top dead center, and a detected misfire determination A misfire detection device for an internal combustion engine, comprising: a misfire determination means for making a misfire determination by comparing an in-cylinder pressure and the misfire determination reference pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5308197A JPH07158501A (en) | 1993-12-08 | 1993-12-08 | Misfire detection device of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5308197A JPH07158501A (en) | 1993-12-08 | 1993-12-08 | Misfire detection device of internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07158501A true JPH07158501A (en) | 1995-06-20 |
Family
ID=17978089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5308197A Pending JPH07158501A (en) | 1993-12-08 | 1993-12-08 | Misfire detection device of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07158501A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014088864A (en) * | 2012-10-31 | 2014-05-15 | Mitsubishi Electric Corp | Control unit of compression self-ignition internal combustion engine |
| CN106609708A (en) * | 2015-10-27 | 2017-05-03 | 卡特彼勒公司 | Pre-chamber fuel admission valve diagnostics |
-
1993
- 1993-12-08 JP JP5308197A patent/JPH07158501A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014088864A (en) * | 2012-10-31 | 2014-05-15 | Mitsubishi Electric Corp | Control unit of compression self-ignition internal combustion engine |
| CN106609708A (en) * | 2015-10-27 | 2017-05-03 | 卡特彼勒公司 | Pre-chamber fuel admission valve diagnostics |
| EP3165743A1 (en) * | 2015-10-27 | 2017-05-10 | Caterpillar Inc. | Pre-chamber fuel admission valve diagnostics |
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