JPH08200196A - Device and method for detecting misfire for internal combustion engine - Google Patents
Device and method for detecting misfire for internal combustion engineInfo
- Publication number
- JPH08200196A JPH08200196A JP1348895A JP1348895A JPH08200196A JP H08200196 A JPH08200196 A JP H08200196A JP 1348895 A JP1348895 A JP 1348895A JP 1348895 A JP1348895 A JP 1348895A JP H08200196 A JPH08200196 A JP H08200196A
- Authority
- JP
- Japan
- Prior art keywords
- ion current
- output
- ignition
- internal combustion
- combustion engine
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
- F02P2017/125—Measuring ionisation of combustion gas, e.g. by using ignition circuits
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は内燃機関に係り、特に、
シリンダ内の燃焼で生じるイオン電流の有無による内燃
機関の失火検出装置、および失火検出方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine, and more particularly to
The present invention relates to a misfire detection device for an internal combustion engine and a misfire detection method depending on the presence or absence of an ionic current generated by combustion in a cylinder.
【０００２】[0002]
【従来の技術】点火コイルの二次巻線の低圧側でイオン
電流を検出する代表的な方法はＵＳＰ4648367号公報に
記載されている。2. Description of the Related Art A typical method for detecting an ion current on the low voltage side of a secondary winding of an ignition coil is described in US Pat. No. 4,648,367.
【０００３】[0003]
【発明が解決しようとする課題】点火時期が異なる複数
の点火プラグに接続した複数のイオン電流検出手段の出
力にはそれぞれ、点火プラグで放電終了時毎に発生する
イオン電流以外の電流、および他のイオン電流検出手段
からのノイズが混入する。The outputs of a plurality of ion current detecting means connected to a plurality of ignition plugs having different ignition timings are the currents other than the ion currents generated at the end of each discharge in the ignition plug, and others. The noise from the ionic current detection means is mixed.
【０００４】本発明の目的は、このイオン電流以外の電
流による失火検出の誤動作を防ぐことにある。An object of the present invention is to prevent misoperation of misfire detection due to a current other than the ion current.
【０００５】[0005]
【課題を解決するための手段】本発明の失火検出装置お
よび失火検出方法は、前記点火信号が立上がる毎に所定
期間は前記イオン電流検出手段の出力を無効にする手段
および方法を有している。The misfire detection device and the misfire detection method of the present invention have means and method for invalidating the output of the ion current detection means for a predetermined period each time the ignition signal rises. There is.
【０００６】[0006]
【作用】本発明では、点火プラグで放電終了時毎に発生
するイオン電流以外の電流、および他のイオン電流検出
手段からのノイズをマスクするため、失火検出の誤動作
を防ぐ作用がある。The present invention masks currents other than the ionic current generated at the end of each discharge in the spark plug and noise from other ionic current detecting means, and thus has the effect of preventing malfunction of misfire detection.
【０００７】[0007]
【実施例】以下、図面を用いて本発明の実施例を説明す
る。図５は、本発明の実施例のエンジンの制御装置の全
体構成を示し、８０１は例えば８気筒のエンジン、８０
２は一端がエアクリーナ８０３を介して大気に開口し他
端がエンジン８０１に開口してエンジン８０１に吸気
（空気）を供給する吸気通路、８０４は一端がエンジン
８０１に開口し他端が大気に開口してエンジン８０１か
らの排気を排出する排気通路である。８０５はエンジン
出力要求に応じて踏込み操作されるアクセルペダル、８
０６は吸気通路８０２に配設され吸入空気量を制御する
スロットル弁であって、スロットル弁８０６は、アクセ
ルペダル８０５とは機械的な連係関係がなく、後述のよ
うにアクセルペダル８０５の踏込み量つまりアクセル操
作量により電気的に制御される。８０７はスロットル弁
８０６を開閉作動させるステップモータ等よりなるスロ
ットルアクチュエータである。８０８は排気通路８０４
に介設され排気ガスを浄化するための触媒装置である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 shows an overall configuration of an engine control device according to an embodiment of the present invention. Reference numeral 801 denotes an 8-cylinder engine, 80
Reference numeral 2 denotes an intake passage having one end open to the atmosphere via the air cleaner 803 and the other end open to the engine 801 to supply intake air (air) to the engine 801, and 804 has one end open to the engine 801 and the other end open to the atmosphere. And an exhaust passage for discharging the exhaust gas from the engine 801. Reference numeral 805 denotes an accelerator pedal which is operated in response to an engine output request, and 8
Reference numeral 06 denotes a throttle valve that is disposed in the intake passage 802 and controls the intake air amount. The throttle valve 806 has no mechanical linkage with the accelerator pedal 805, and as described below, the depression amount of the accelerator pedal 805, that is, It is electrically controlled by the accelerator operation amount. Reference numeral 807 denotes a throttle actuator including a step motor or the like for opening and closing the throttle valve 806. 808 is an exhaust passage 804
Is a catalyst device for purifying exhaust gas.
【０００８】また、８０９は一端が排気通路８０４の触
媒装置８０８上流に開口し他端が吸気通路８０２のスロ
ットル弁８０６下流に開口して、排気通路８０４の排気
ガスの一部を吸気通路８０２に還流する排気還流通路、
８１０は排気還流通路８０９の途中に介設され、排気還
流量を制御する吸気負圧を作動源とするダイヤフラム装
置よりなる還流制御弁、８１１は還流制御弁８１０を開
閉制御するソレノイド弁である。Further, one end 809 of the exhaust passage 804 is opened upstream of the catalyst device 808 and the other end thereof is opened downstream of the throttle valve 806 of the intake passage 802, so that part of the exhaust gas in the exhaust passage 804 is introduced into the intake passage 802. Exhaust gas recirculation passage for recirculation,
Reference numeral 810 is a recirculation control valve that is provided in the middle of the exhaust gas recirculation passage 809 and includes a diaphragm device that uses an intake negative pressure for controlling the amount of recirculation of exhaust gas as an operation source, and 811 is a solenoid valve that controls opening / closing of the recirculation control valve 810.
【０００９】一方、８１２は吸気通路８０２のスロット
ル弁８０６下流に配設され燃料を噴射供給する燃料噴射
弁である。燃料噴射弁８１２は燃料ポンプ８１３および
燃料フィルタ８１４を介設した燃料供給通路８１５を介
して燃料タンク８１６に連通されており、燃料タンク８
１６からの燃料が送給されるとともに、その余剰燃料は
燃圧レギュレータ８１７を介設したリターン通路８１８
を介して燃料タンク８１６に還流され、よって所定圧の
燃料が燃料噴射弁８１２に供給されるようにしている。On the other hand, reference numeral 812 denotes a fuel injection valve which is arranged downstream of the throttle valve 806 in the intake passage 802 and injects and supplies fuel. The fuel injection valve 812 is connected to a fuel tank 816 via a fuel supply passage 815 having a fuel pump 813 and a fuel filter 814.
16 is supplied, and the surplus fuel is supplied to the return passage 818 having the fuel pressure regulator 817.
The fuel is recirculated to the fuel tank 816 via the fuel tank 816, and thus fuel having a predetermined pressure is supplied to the fuel injection valve 812.
【００１０】加えて、８１９はアクセルペダル８０５の
踏込み量つまりアクセル操作量αを検出するアクセル操
作量検出手段としてのアクセルペダルポジションセン
サ、８２０は吸気通路８０２のスロットル弁８０６上流
に配設され吸入空気量（ＱａＲ）を検出する吸気量検出
手段としてのエアフローメータ、８２１は同じく吸気通
路８０２のスロットル弁８０６の開度を検出するスロッ
トルポジションセンサ、８２３はエンジン冷却水の温度
ＴＷを検出する水温センサ、８２４は排気通路８０４の
触媒装置８０８上流に配設され排気ガス中の酸素濃度成
分よりエンジン８０１の空燃比λを検出するＯ2 セン
サ、８２５は還流制御弁８１０に付設され排気還流時を
検出する排気還流時検出手段としての還流センサであっ
て、これら８１９〜８２５の検出信号はアナログコンピ
ュータ等よりなるコントロールユニット８２６に入力さ
れていて、コントロールユニット８２６によりスロット
ルアクチュエータ８０７，ソレノイド弁８１１および燃
料噴射弁８１２が制御される。さらに、コントロールユ
ニット８２６にはイグナイタ８２７が入力接続されてい
て、点火回数つまりエンジン回転数Ｎｅの信号を入力し
ている。コントロールユニット８２６は点火プラグ８２
８と接続しており、点火時期信号を出力している。ま
た、コントロールユニット８２６にはバッテリ８２９が
入力接続されていて、バッテリ電圧ＶＢの信号を入力し
ている。In addition, 819 is an accelerator pedal position sensor as an accelerator operation amount detecting means for detecting the depression amount of the accelerator pedal 805, that is, the accelerator operation amount α, and 820 is arranged in the intake passage 802 upstream of the throttle valve 806. An air flow meter as an intake air amount detecting means for detecting the amount (QaR), 821 a throttle position sensor for detecting the opening of the throttle valve 806 of the intake passage 802, 823 a water temperature sensor for detecting the temperature TW of the engine cooling water, Reference numeral 824 is an O 2 sensor arranged upstream of the catalyst device 808 in the exhaust passage 804 to detect the air-fuel ratio λ of the engine 801 from the oxygen concentration component in the exhaust gas, and 825 is attached to the recirculation control valve 810 to detect when exhaust gas is recirculating. A recirculation sensor as exhaust gas recirculation time detection means, The detection signal is input to the control unit 826 consisting of analog computer, the throttle actuator 807 by the control unit 826, the solenoid valve 811 and the fuel injection valve 812 is controlled. Further, an igniter 827 is input-connected to the control unit 826 to input a signal indicating the number of ignitions, that is, the engine speed Ne. The control unit 826 is a spark plug 82.
8 and outputs an ignition timing signal. Further, a battery 829 is input-connected to the control unit 826 and inputs a signal of the battery voltage VB.
【００１１】図１は、２気筒エンジンのイオン電流検出
システム図である。バッテリ１０と点火コイル２０ａ，
２０ｂの一次巻線２１ａ，２１ｂと点火トランジスタ３
０ａ，３０ｂをそれぞれ接続し、制御装置４０で点火時
期の制御を行う。点火コイル２０ａ，２０ｂの二次巻線
２２ａ，２２ｂの高圧側は、それぞれシリンダ５０ａ，
５０ｂ内の点火プラグ６０ａ，６０ｂに、低圧側はイオ
ン電流検出手段７０ａ，７０ｂにそれぞれ接続する。イ
オン電流検出手段７０ａ，７０ｂは、それぞれ反転増幅
器８０ａ，８０ｂ，積分器９０ａ，９０ｂ，反転増幅器
１００ａ，100bを経て失火判定出力１０１ａ，１０１ｂ
を得る。マスク回路２００ａ，２００ｂは、それぞれト
ランジスタ３００ａ，３００ｂをオンし、この期間は他
方の反転増幅器８０ｂ，８０ａの出力を０にマスクす
る。更に、このマスク回路２００ａ，２００ｂは、それ
ぞれトランジスタ２１０ａ，２１０ｂをオンし、この期
間は積分値を０にマスクする。FIG. 1 is a diagram of an ion current detection system for a two-cylinder engine. Battery 10 and ignition coil 20a,
20b primary windings 21a, 21b and ignition transistor 3
0a and 30b are connected to each other, and the control device 40 controls the ignition timing. The high-voltage side of the secondary windings 22a and 22b of the ignition coils 20a and 20b are connected to the cylinders 50a and
The spark plugs 60a and 60b in 50b are connected to the ion current detecting means 70a and 70b on the low voltage side. The ion current detecting means 70a, 70b pass through inverting amplifiers 80a, 80b, integrators 90a, 90b, inverting amplifiers 100a, 100b, respectively, and misfire determination outputs 101a, 101b.
Get. The mask circuits 200a and 200b turn on the transistors 300a and 300b, respectively, and mask the outputs of the other inverting amplifiers 80b and 80a to 0 during this period. Further, the mask circuits 200a and 200b turn on the transistors 210a and 210b, respectively, and mask the integrated value to 0 during this period.
【００１２】図２は、図１のタイミングチャートであ
る。制御装置４０で出力された点火信号４１ａ，４１ｂ
に対し、点火コイル２０ａ，２０ｂの二次巻線２２ａ，
２２ｂに２３ａ，２３ｂの電流がそれぞれ流れ、点火プ
ラグ６０ａ，６０ｂが交互に放電する。時刻ｔ０では点
火プラグ６０ａとシリンダ５０ａ間の静電容量や漏洩容
量２４ａへの充電電流が流れ、時刻ｔ１では点火プラグ
６０ａの火花放電電流が流れ、時刻ｔ２ではイオン電流
検出手段７０ａのコンデンサ７１ａに充電された電圧に
より、点火プラグ６０ａとシリンダ５０ａ間の静電容量
や漏洩容量２４ａへの充電電流が流れ、その後、時刻ｔ
３からシリンダ５０ａ内に生じるイオンによりイオン電
流が流れる。コンデンサ７１ａの充電電圧で流れる電流
によって生じるイオン電流検出手段７０ａの出力７２ａ
はアース側が正の負電圧であり、反転増幅器８０ａで正
電圧の出力８１ａとなる。マスク回路２００ａは、出力
81ａをクロック，点火信号４１ａをリセットとするフリ
ップフロップ２０１ａの出力２０２ａの立上りで動作す
るワンショット２０３ａで時間Ｔ１の出力２０４ａを得
る。フリップフロップ２０１ａの反転出力とワンショッ
ト２０３ａの出力204aをオア２０５ａの入力として出力
２０６ａを得る。同様に、制御装置４０で出力された点
火信号４１ｂに対し、マスク回路の出力２０６ｂを得
る。つまり時間Ｔ２は、一方の点火プラグ６０ａに接続
しているイオン電流検出回路７０ａにとってみれば、も
う一方の点火プラグ６０ｂの点火信号４１ｂの立上りか
ら始まり、点火プラグ６０ｂの放電終了後、時刻ｔ７〜
ｔ８に発生するイオン電流以外の電流を検出し終わるま
での期間となる。マスク回路２００ｂの出力２０６ｂに
より、時間Ｔ２だけトランジスタ３００ｂがオンするの
で、イオン電流検出手段７０ａの出力７２ａにおいて時
間Ｔ２に現れるノイズをマスクし、この間の出力が無効
となって、ノイズが出力されない反転増幅器８０ａの出
力８１ａを得る。ノイズは、イオン電流検出手段７０ａ
と７０ｂとのグランドレベルの変動や、電磁誘導等に起
因しており、二次巻線２２ｂの電流２３ｂに誘導された
ものである。マスク回路２００ａの出力２０６ａによ
り、時刻ｔ０から時刻ｔ４まではトランジスタ２１０ａ
がオンするので、この間、積分器９０ａがリセットさ
れ、この間のイオン電流以外の電流は積分されない。す
なわち、積分器９０ａは時刻ｔ４から次の点火信号４１
ａが出力する時刻ｔ１０までのイオン電流検出手段７０
ａの出力７２ａが積分され、その積分値を反転増幅器１
００ａにより正電圧101ａとして得る。次の点火信号４
１ａで時刻ｔ１１から時刻ｔ１２で火花放電電流が流れ
ても点火しない場合は、時刻ｔ１３以降のイオン電流が
流れないので時刻ｔ１４以降の積分値は０となる。これ
より、反転増幅器１００ａの出力１０１ａの有無により
失火判定をすることができる。他方の失火検出手段につ
いても全く同様の説明である。なお、時間Ｔ１は失火時
波形から判るように、時刻ｔ１２から時刻ｔ１３′の時
間幅に設定する。FIG. 2 is a timing chart of FIG. Ignition signals 41a and 41b output by the control device 40
On the other hand, the secondary windings 22a of the ignition coils 20a, 20b,
The electric currents of 23a and 23b flow into 22b, respectively, and the spark plugs 60a and 60b are alternately discharged. At time t0, a charging current for the electrostatic capacity between the spark plug 60a and the cylinder 50a or the leakage capacitance 24a flows, a spark discharge current for the spark plug 60a flows at time t1, and a capacitor 71a of the ion current detecting means 70a at time t2. Due to the charged voltage, a charging current to the electrostatic capacity between the spark plug 60a and the cylinder 50a or the leakage capacity 24a flows, and then, at time t
An ion current flows due to the ions generated in the cylinder 50a from No. 3. Output 72a of ion current detecting means 70a generated by current flowing at the charging voltage of the capacitor 71a
Has a positive negative voltage on the ground side, and becomes a positive voltage output 81a in the inverting amplifier 80a. The mask circuit 200a outputs
The output 204a at time T1 is obtained by the one-shot 203a which operates at the rising edge of the output 202a of the flip-flop 201a whose clock is 81a and whose ignition signal 41a is reset. The output 206a is obtained by using the inverted output of the flip-flop 201a and the output 204a of the one-shot 203a as the input of the OR 205a. Similarly, the output 206b of the mask circuit is obtained with respect to the ignition signal 41b output by the control device 40. In other words, the time T2 starts from the rise of the ignition signal 41b of the other ignition plug 60b, when the ion current detection circuit 70a connected to the one ignition plug 60a starts, and after the discharge of the ignition plug 60b ends, the time t7-.
This is a period until the detection of a current other than the ion current generated at t8 is completed. Since the output 206b of the mask circuit 200b turns on the transistor 300b for the time T2, the noise appearing at the time T2 at the output 72a of the ion current detecting means 70a is masked, and the output during this period is invalidated, and the noise is not output. The output 81a of the amplifier 80a is obtained. Noise is caused by the ion current detecting means 70a.
And 70b due to fluctuations in the ground level, electromagnetic induction, etc., and are induced by the current 23b in the secondary winding 22b. The output 206a of the mask circuit 200a causes the transistor 210a from time t0 to time t4.
Is turned on, the integrator 90a is reset during this period, and currents other than the ion current during this period are not integrated. That is, the integrator 90a starts the next ignition signal 41 from time t4.
Ion current detection means 70 until time t10 output by
The output 72a of a is integrated, and the integrated value is calculated by the inverting amplifier 1
00a to obtain a positive voltage 101a. Next ignition signal 4
If ignition does not occur even if a spark discharge current flows from time t11 to time t12 at 1a, the ion current after time t13 does not flow, so the integrated value after time t14 becomes zero. From this, misfire determination can be made based on the presence or absence of the output 101a of the inverting amplifier 100a. The same description applies to the other misfire detecting means. The time T1 is set to a time width from time t12 to time t13 ', as can be seen from the misfire waveform.
【００１３】本実施例によれば、時間Ｔ１のマスク時間
により火花放電終了直後に生じる不要な波形、およびＴ
２のマスク時間により他方のイオン電流検出手段からの
ノイズを除いた実際のイオン電流の積分値が得られるの
で、失火検出を確実にできる効果がある。According to this embodiment, an unnecessary waveform generated immediately after the end of the spark discharge due to the mask time of time T1 and T
With the mask time of 2, the actual integrated value of the ion current excluding the noise from the other ion current detecting means is obtained, so that there is an effect that the misfire detection can be surely performed.
【００１４】図３は本発明の他の実施例で、８気筒エン
ジンのイオン電流による失火検出システムの回路図であ
る。各点火プラグに接続した点火コイルの二次巻線の低
圧側４００に、イオン電流検出モジュール５００を接続
し、モジュールの出力510ａ,５１０ｂ，５１０ｃ，５１
０ｄを基に制御装置６００でイオン電流部のみを積分
し、CPU670がその積分値で失火を判定する。互いに点火
時期の位相が１８０゜ずれている点火コイルの二次巻線
の低圧側４０１と４０２,４０３と４０４,４０５と４０
６，４０７と４０８をそれぞれイオン電流検出手段５０
０ａ，５００ｂ，５００ｃ，５００ｄに接続する。FIG. 3 is another embodiment of the present invention, which is a circuit diagram of an ion current misfire detection system for an 8-cylinder engine. The ion current detection module 500 is connected to the low-voltage side 400 of the secondary winding of the ignition coil connected to each spark plug, and the output 510a, 510b, 510c, 51 of the module is connected.
Based on 0d, the controller 600 integrates only the ion current portion, and the CPU 670 determines the misfire based on the integrated value. The phases of the ignition timing are 180 ° out of phase with each other. The low-voltage side 401, 402, 403, 404, 405, 40 of the secondary winding of the ignition coil.
6, 407 and 408 are ion current detecting means 50, respectively.
0a, 500b, 500c, 500d.
【００１５】図４は、図３のタイミングチャートであ
る。エンジンの制御装置７００で出力された点火信号７
１０に同期したイオン電流検出モジュール５００の出力
510ａ,５１０ｂ，５１０ｃ，５１０ｄは、それぞれ反転
増幅器６１０ａ，６１０ｂ，６１０ｃ，６１０ｄで正電
圧となり、マルチプレクサ６２０の入力となる。CPU670
からの信号６７１，６７２に従って、イオン電流検出手
段５００の出力５１０ａ，５１０ｂ，５１０ｃ，５１０
ｄのうち、点火時期の位相が互いに１８０゜ずれている
５１０ａと５１０ｂ，５１０ｃと５１０ｄをそれぞれ合
成した信号を前記実施例と同様、マスク回路６３０ａ，
６３０ｂで処理し、ノイズをマスクしたマルチプレクサ
６２０の出力６３１ａ，６３１ｂを得る。CPU670からの
信号６７３ａ，６７３ｂは、積分器６６０ａ，６６０ｂ
の積分期間を決定し、それに従って積分器６６０ａ，６
６０ｂはマルチプレクサ６２０の出力６３１ａ，６３１
ｂを積分し、イオン電流積分波形６６１ａ，６６１ｂを
得る。これより、CPU670がイオン電流積分波形６６１
ａ，６６１ｂの有無を判定し、失火判定する。FIG. 4 is a timing chart of FIG. Ignition signal 7 output from engine control unit 700
Output of ion current detection module 500 synchronized with 10
510a, 510b, 510c, and 510d become positive voltages in the inverting amplifiers 610a, 610b, 610c, and 610d, respectively, and are input to the multiplexer 620. CPU670
Outputs 510a, 510b, 510c, 510 of the ion current detecting means 500 according to the signals 671, 672 from
In the same manner as in the above embodiment, the signals obtained by combining 510a and 510b and 510c and 510d, whose phases of the ignition timing are 180 ° out of phase with each other, are masked by the mask circuit 630a,
The outputs 631a and 631b of the multiplexer 620, which have been processed by 630b and have noise masked, are obtained. Signals 673a and 673b from the CPU 670 are supplied to integrators 660a and 660b.
Of the integrators 660a, 6
60b is the output 631a, 631 of the multiplexer 620.
b is integrated to obtain ion current integral waveforms 661a and 661b. From this, the CPU 670 shows that the ion current integral waveform 661
The presence or absence of a and 661b is determined, and misfire is determined.
【００１６】本実施例によれば、８気筒エンジンの場合
にも火花放電終了直後に生じる不要な波形、および点火
時期の異なる気筒のイオン電流検出手段からのノイズを
除いた実際のイオン電流の積分値が得られるので、失火
検出が確実にできる。According to this embodiment, even in the case of an 8-cylinder engine, an unnecessary waveform generated immediately after the end of the spark discharge and the integration of the actual ion current excluding the noise from the ion current detecting means of the cylinders having different ignition timings. Since the value is obtained, misfire detection can be reliably performed.
【００１７】また、８気筒エンジンに限らず複数気筒の
失火検出する場合についても作用，効果は同等である。Further, not only in the case of the 8-cylinder engine but also in the case of detecting the misfires of a plurality of cylinders, the action and the effect are the same.
【００１８】[0018]
【発明の効果】点火プラグで放電終了直後に生じる不要
な波形、および他のイオン電流検出手段からのノイズを
マスクできるので、失火検出が確実にできる。EFFECTS OF THE INVENTION Since it is possible to mask unnecessary waveforms generated immediately after the end of discharge with the spark plug and noise from other ion current detecting means, misfire detection can be reliably performed.
【図１】本発明による失火検出装置の一実施例を示す回
路図。FIG. 1 is a circuit diagram showing an embodiment of a misfire detection device according to the present invention.
【図２】一実施例の動作の説明図。FIG. 2 is an explanatory diagram of the operation of the embodiment.
【図３】本発明による失火検出装置の他の実施例を示す
回路図。FIG. 3 is a circuit diagram showing another embodiment of the misfire detection device according to the present invention.
【図４】他の実施例の動作の説明図。FIG. 4 is an explanatory diagram of an operation of another embodiment.
【図５】全体システムのタイミングチャート。FIG. 5 is a timing chart of the entire system.
２０ａ，２０ｂ…点火コイル、４０…制御装置、７０
ａ，７０ｂ…イオン電流検出手段、８０ａ，８０ｂ，１
００ａ，１００ｂ…反転増幅器、９０ａ，９０ｂ…積分
器、２００ａ，２００ｂ…マスク回路。20a, 20b ... Ignition coil, 40 ... Control device, 70
a, 70b ... Ion current detection means, 80a, 80b, 1
00a, 100b ... Inverting amplifier, 90a, 90b ... Integrator, 200a, 200b ... Mask circuit.
Claims (7)
つの一次巻線と少なくとも一つの二次巻線で構成される
複数の点火コイル，複数の点火プラグ，前記点火コイル
の一次巻線を通電し、前記複数の点火プラグを異なるタ
イミングで点火させる点火信号，前記複数の点火プラグ
に接続された複数のイオン電流検出手段，前記イオン電
流検出手段の出力の有無により失火検出する手段を有
し、前記点火プラグの放電により前記シリンダ内で燃焼
を生じさせる内燃機関において、前記点火信号が一つの
点火プラグを点火させる毎に所定期間は、他の点火プラ
グに接続された前記イオン電流検出手段の出力を無効に
する手段を有していることを特徴とする内燃機関の失火
検出装置。1. A plurality of ignition coils each comprising at least one cylinder, at least one primary winding and at least one secondary winding, a plurality of ignition plugs, and a primary winding of the ignition coil, wherein: An ignition signal for igniting a plurality of ignition plugs at different timings; a plurality of ion current detecting means connected to the plurality of ignition plugs; and means for detecting a misfire based on the presence or absence of an output of the ion current detecting means. In an internal combustion engine that causes combustion in the cylinder by the discharge of, each time the ignition signal ignites one spark plug, the output of the ion current detection means connected to another spark plug is invalidated for a predetermined period. A misfire detection device for an internal combustion engine, comprising:
つの一次巻線と少なくとも一つの二次巻線で構成される
複数の点火コイル，複数の点火プラグ，前記点火コイル
の一次巻線を通電し、前記複数の点火プラグを異なるタ
イミングで点火させる点火信号，前記複数の点火プラグ
に接続された複数のイオン電流検出手段，前記イオン電
流検出手段の出力の有無により失火検出する手段を有
し、前記点火プラグの放電により前記シリンダ内で燃焼
を生じさせる内燃機関において、前記点火信号が一つの
点火プラグを点火させる毎に所定期間は、他の点火プラ
グに接続された前記イオン電流検出手段の出力を無効に
することを特徴とする内燃機関の失火検出方法。2. A plurality of ignition coils each comprising at least one cylinder, at least one primary winding and at least one secondary winding, a plurality of ignition plugs, and a primary winding of the ignition coil, wherein An ignition signal for igniting a plurality of ignition plugs at different timings; a plurality of ion current detecting means connected to the plurality of ignition plugs; and means for detecting a misfire based on the presence or absence of an output of the ion current detecting means. In an internal combustion engine that causes combustion in the cylinder by the discharge of, each time the ignition signal ignites one spark plug, the output of the ion current detection means connected to another spark plug is invalidated for a predetermined period. A method for detecting a misfire of an internal combustion engine, comprising:
オン電流検出手段は、前記二次巻線の低圧側に接続され
ている内燃機関の失火検出装置。3. The misfire detection device for an internal combustion engine according to claim 1 or 2, wherein the ion current detection means is connected to a low voltage side of the secondary winding.
火プラグは、前記二次巻線の高圧側に接続されている内
燃機関の失火検出装置。4. The misfire detection device for an internal combustion engine according to claim 1, wherein the spark plug is connected to a high voltage side of the secondary winding.
オン電流検出手段の出力を無効にする手段にスイッチ手
段を用いる内燃機関の失火検出装置。5. The misfire detection device for an internal combustion engine according to claim 1, wherein a switch means is used as a means for invalidating the output of the ion current detection means.
オン電流検出手段の出力を無効にする期間が、前記一次
巻線に通電開始から前記点火プラグの放電が終了した
後、所定時間経過後までである内燃機関の失火検出装
置。6. The period for invalidating the output of the ion current detecting means according to claim 1 or 2, after a lapse of a predetermined time from the start of energization of the primary winding to the end of discharge of the spark plug. Misfire detection device for internal combustion engine.
終了検出は、前記イオン電流検出手段の出力の立上りを
入力とする手段で構成される内燃機関の失火検出装置。7. The misfire detection device for an internal combustion engine according to claim 6, wherein the discharge end detection of the spark plug is constituted by means for inputting a rise of an output of the ion current detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1348895A JPH08200196A (en) | 1995-01-31 | 1995-01-31 | Device and method for detecting misfire for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1348895A JPH08200196A (en) | 1995-01-31 | 1995-01-31 | Device and method for detecting misfire for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08200196A true JPH08200196A (en) | 1996-08-06 |
Family
ID=11834514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1348895A Pending JPH08200196A (en) | 1995-01-31 | 1995-01-31 | Device and method for detecting misfire for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08200196A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0278712A2 (en) * | 1987-02-06 | 1988-08-17 | Kao Corporation | Method of separating oleaginous matter into components having various melting points |
| EP1217207A3 (en) * | 2000-12-20 | 2004-04-07 | Honda Giken Kogyo Kabushiki Kaisha | Misfire detection system for internal combustion engines |
-
1995
- 1995-01-31 JP JP1348895A patent/JPH08200196A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0278712A2 (en) * | 1987-02-06 | 1988-08-17 | Kao Corporation | Method of separating oleaginous matter into components having various melting points |
| EP0278712B1 (en) * | 1987-02-06 | 1993-10-27 | Kao Corporation | Method of separating oleaginous matter into components having various melting points |
| EP1217207A3 (en) * | 2000-12-20 | 2004-04-07 | Honda Giken Kogyo Kabushiki Kaisha | Misfire detection system for internal combustion engines |
| US6803765B2 (en) | 2000-12-20 | 2004-10-12 | Honda Giken Kogyo Kabushiki Kaisha | Misfire detection system for internal combustion engines |
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