[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

JP2007332895A - Misfire detecting device of internal combustion engine - Google Patents

Misfire detecting device of internal combustion engine Download PDF

Info

Publication number
JP2007332895A
JP2007332895A JP2006166935A JP2006166935A JP2007332895A JP 2007332895 A JP2007332895 A JP 2007332895A JP 2006166935 A JP2006166935 A JP 2006166935A JP 2006166935 A JP2006166935 A JP 2006166935A JP 2007332895 A JP2007332895 A JP 2007332895A
Authority
JP
Japan
Prior art keywords
misfire
determination value
cylinder
misfire determination
detection
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
Application number
JP2006166935A
Other languages
Japanese (ja)
Other versions
JP4573048B2 (en
Inventor
Eiji Takakuwa
栄司 高桑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Denso Corp filed Critical Denso Corp
Priority to JP2006166935A priority Critical patent/JP4573048B2/en
Publication of JP2007332895A publication Critical patent/JP2007332895A/en
Application granted granted Critical
Publication of JP4573048B2 publication Critical patent/JP4573048B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Ignition Installations For Internal Combustion Engines (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To improve misfire detecting accuracy, by preventing noise by electrifying electric charge of a spark plug from being erroneously detected as a combustion ion, in a system for determining the existence of a misfire by comparing its ion current peak value (or such as an integral value) with a misfire determining value, by detecting an ion (the combustion ion) generated in response to combustion of an air-fuel mixture in a combustion chamber of an internal combustion engine via the spark plug. <P>SOLUTION: Every time when detecting the misfire in any cylinder, the misfire determining value of a misfire cylinder is respectively increasingly corrected by a predetermined quantity. When detecting ignition on the cylinder of increasingly correcting the misfire determining value by misfire detection, the misfire determining value is returned to a base misfire determining value VthO (a minimum misfire determining value) before detecting the misfire. In this case, the misfire determining value of the cylinder of continuously detecting the misfire, is processed for a guard by a predetermined upper limit guard value Vthmax, and an excessive correction of the misfire determining value is prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、内燃機関の燃焼室内で混合気の燃焼に伴って発生するイオン電流を点火プラグを介して検出して、そのイオン電流検出値に基づいて失火の有無を判定する内燃機関の失火検出装置に関する発明である。   The present invention detects an ionic current generated by combustion of an air-fuel mixture in a combustion chamber of an internal combustion engine through a spark plug, and determines the presence or absence of misfiring based on the detected ionic current value. It is an invention related to a device.

近年、内燃機関の筒内で混合気が燃焼する際にイオン(燃焼イオン)が発生する特性に着目して、点火毎に筒内で発生するイオン電流を点火プラグの電極を介して検出し、そのイオン電流検出値に基づいて着火/失火を検出する技術が開発されている。従来の着火/失火の判定方法は、着火時にイオン電流が増加し、失火発生時にイオン電流が減少する性質を利用し、イオン電流検出信号の積分値又はピーク値を所定の失火判定値と比較して、イオン電流検出信号の積分値又はピーク値が失火判定値以上であれば、着火と判定し、そうでなければ、失火と判定するものである(特許文献1:特許第2505620号公報参照)。   In recent years, focusing on the characteristics that ions (combustion ions) are generated when the air-fuel mixture burns in the cylinder of the internal combustion engine, the ion current generated in the cylinder for each ignition is detected via the electrode of the ignition plug, A technique for detecting ignition / misfire based on the detected value of ion current has been developed. The conventional ignition / misfire determination method uses the property that the ion current increases at the time of ignition and decreases when the misfire occurs, and the integrated value or peak value of the ion current detection signal is compared with a predetermined misfire determination value. If the integral value or peak value of the ion current detection signal is greater than or equal to the misfire determination value, it is determined to be ignited; otherwise, it is determined to be misfire (see Patent Document 1: Japanese Patent No. 2505620). .

更に、特許文献2(特許第2552754号公報)に記載された失火検出装置は、内燃機関の運転状態に応じてイオン電流検出信号のノイズレベルが変化することを考慮して、内燃機関の運転状態に応じて失火判定値を変化させることで、内燃機関の運転状態の変化によるノイズレベルの変化に応じて失火判定値を変化させて失火検出精度を向上させるようにしている。
特許第2505620号公報(第4頁等) 特許第2552754号公報(第3頁等)
Furthermore, the misfire detection device described in Patent Document 2 (Japanese Patent No. 2552754) takes into account that the noise level of the ion current detection signal changes according to the operation state of the internal combustion engine, and thus the operation state of the internal combustion engine. By changing the misfire determination value according to the above, the misfire determination value is changed according to the change in the noise level due to the change in the operating state of the internal combustion engine, thereby improving the misfire detection accuracy.
Japanese Patent No. 2505620 (page 4 etc.) Japanese Patent No. 2552754 (3rd page, etc.)

一般に、燃焼イオンが発生する区間でイオン電流検出信号に重畳するノイズは、点火プラグのガイシ部に帯電した電荷により発生し、その帯電電荷量が多くなるほど、ノイズレベルが大きくなるという関係がある。また、本発明者の研究結果によれば、点火プラグの帯電電荷によるノイズの特徴は、燃焼時には燃焼イオン(電離ガス)により帯電電荷が中和される作用により帯電電荷量が減少してノイズの影響がほとんど無くなるが、失火時には、燃焼イオンが発生しないため、上述した燃焼イオンによる帯電電荷の中和作用が発生せず、帯電電荷量が減少しないため、ノイズレベルが大きくなるということが判明した。特に、失火が連続して発生する場合は、その連続失火回数が多くなるほど、帯電電荷量が増加してかなり大きなノイズが発生することが判明した。   In general, noise superimposed on an ion current detection signal in a section where combustion ions are generated is generated by charges charged on the insulator portion of the spark plug, and there is a relationship that the noise level increases as the amount of charged charges increases. In addition, according to the research results of the present inventors, the characteristic of noise due to the charged charge of the spark plug is that the amount of charged charge decreases due to the action of neutralizing the charged charge by combustion ions (ionized gas) during combustion. Although it has almost no effect, it has been found that since no combustion ions are generated in the event of a misfire, the above-mentioned neutralization effect of charged charges by the combustion ions does not occur, and the amount of charged charges does not decrease, resulting in an increase in noise level. . In particular, when misfires occur continuously, it has been found that as the number of consecutive misfires increases, the amount of charged charges increases and a considerably large noise is generated.

従って、上記特許文献2のように、内燃機関の運転状態に応じて失火判定値を変化させても、連続失火時には、着火時よりもノイズレベルがかなり大きくなるため、ノイズレベルが失火判定値を越えてしまうことがあり、連続失火を誤って着火と判定してしまう可能性があった。   Accordingly, even if the misfire determination value is changed in accordance with the operating state of the internal combustion engine as in Patent Document 2, the noise level becomes considerably larger at the time of continuous misfire than at the time of ignition. In some cases, it was possible to overshoot, and there was a possibility that a continuous misfire was mistakenly determined to be ignition.

本発明はこのような事情を考慮してなされたものであり、従ってその目的は、内燃機関の全ての気筒で点火プラグの帯電電荷によるノイズを燃焼イオンとして誤検出することを防止できて、失火検出精度を向上させることができる内燃機関の失火検出装置を提供することにある。   The present invention has been made in view of such circumstances. Therefore, the object of the present invention is to prevent misdetection of noise caused by the charged charge of the spark plug as combustion ions in all cylinders of the internal combustion engine. An object of the present invention is to provide a misfire detection device for an internal combustion engine that can improve detection accuracy.

ところで、内燃機関の各気筒毎に燃焼状態が異なるため、燃焼イオンによる帯電電荷の中和作用の発生度合ひいては点火プラグの帯電電荷によるノイズレベルも各気筒毎に異なる。従って、従来のように内燃機関の全ての気筒に共通する1つの失火判定値を用いて失火を検出したのでは、一部の気筒で点火プラグの帯電電荷によるノイズを燃焼イオンとして誤検出することは避けられない。   By the way, since the combustion state is different for each cylinder of the internal combustion engine, the degree of occurrence of the neutralization effect of the charged charge by the combustion ions and the noise level due to the charged charge of the spark plug are also different for each cylinder. Therefore, when a misfire is detected using a single misfire determination value common to all cylinders of an internal combustion engine as in the prior art, noise due to the charged charge of the spark plug is erroneously detected as combustion ions in some cylinders. Is inevitable.

このような事情を考慮して、請求項1に係る発明は、内燃機関の各気筒毎に燃焼状態が異なることを考慮して、内燃機関の各気筒毎に失火判定値を燃焼状態(例えば失火、着火、不完全燃焼等)に応じて可変設定する気筒別失火判定値設定手段を設けるようにしたものである。このようにすれば、各気筒毎に燃焼状態が異なって、燃焼イオンによる帯電電荷の中和作用の発生度合ひいては帯電電荷によるノイズレベルが各気筒毎に異なるのに対応して、各気筒毎に失火判定値を帯電電荷によるノイズレベルに合わせて可変設定することができ、内燃機関の全ての気筒で帯電電荷によるノイズを燃焼イオンとして誤検出することを防止できて、失火の検出精度を向上させることができる。   In view of such circumstances, the invention according to claim 1 considers that the combustion state differs for each cylinder of the internal combustion engine, and sets the misfire determination value for each cylinder of the internal combustion engine (for example, misfire). , Ignition, incomplete combustion, etc.) are provided for each cylinder misfire determination value setting means. In this way, the combustion state is different for each cylinder, and the degree of occurrence of the neutralization effect of the charged charges by the combustion ions and the noise level due to the charged charges are different for each cylinder. The misfire determination value can be variably set according to the noise level caused by the charged charge, and it is possible to prevent erroneous detection of noise caused by the charged charge as combustion ions in all cylinders of the internal combustion engine, thereby improving the misfire detection accuracy. be able to.

この場合、請求項2のように、内燃機関の各気筒毎に失火検出時と着火検出時とで前記失火判定値を可変設定するようにすると良い。このようにすれば、各気筒毎に失火判定結果に基づいて失火判定値を簡単に可変設定することができる。尚、各気筒の燃焼状態として、失火/着火の他に、不完全燃焼、プレイグニッション等を検出する機能を備えているシステムでは、不完全燃焼、プレイグニッション等の判定結果も考慮して失火判定値を可変設定するようにしても良い。   In this case, as in claim 2, the misfire determination value may be variably set for each cylinder of the internal combustion engine when misfire is detected and when ignition is detected. In this way, the misfire determination value can be easily variably set based on the misfire determination result for each cylinder. In addition to misfire / ignition as a combustion state of each cylinder, in a system equipped with a function for detecting incomplete combustion, pre-ignition, etc., misfire determination is also performed in consideration of determination results such as incomplete combustion, pre-ignition, etc. The value may be variably set.

また、失火が発生すると、点火プラグの帯電電荷量が増加してノイズレベルが大きくなるという特性を考慮して、請求項3のように、いずれかの気筒で失火を検出したときに当該失火気筒の失火判定値を増加補正し、失火検出により前記失火判定値が増加補正された気筒について着火を検出したときに当該失火判定値を減少補正し又は失火検出前の失火判定値に復帰させるようにしても良い。このようにすれば、各気筒毎に失火判定値を帯電電荷によるノイズレベルの増減に合わせて精度良く可変設定することができる。   Further, in consideration of the characteristic that when the misfire occurs, the charged charge amount of the spark plug increases and the noise level increases, and when the misfire is detected in any one of the cylinders as in claim 3, the misfire cylinder The misfire determination value is corrected to increase, and when ignition is detected for the cylinder whose increase in misfire determination value is corrected by misfire detection, the misfire determination value is corrected to decrease or returned to the misfire determination value before the misfire detection. May be. In this way, it is possible to variably set the misfire determination value for each cylinder in accordance with the increase or decrease of the noise level due to the charged charge.

また、失火が連続して発生する場合は、その連続失火回数が多くなるほど、点火プラグの帯電電荷量が増加してノイズレベルが大きくなる傾向があるが、帯電電荷量やノイズレベルは無制限に増加するものではなく、その増加にも一定の限界がある。   In addition, when misfires occur continuously, as the number of consecutive misfires increases, the charge amount of the spark plug tends to increase and the noise level tends to increase, but the charge amount and noise level increase without limit. There is a certain limit to the increase.

この点を考慮して、請求項4のように、失火が連続して検出される気筒の失火判定値を連続失火検出回数又は連続失火検出時間に応じて所定の上限ガード値以下の範囲で増加補正するようにすると良い。このようにすれば、失火が連続して検出される気筒の失火判定値を、連続失火によるノイズレベルの増加量に合わせて精度良く増加補正できると共に、失火判定値の過補正を防止することができる。   In consideration of this point, as in claim 4, the misfire determination value of the cylinder in which misfire is continuously detected is increased within a predetermined upper guard value or less in accordance with the number of consecutive misfire detections or the continuous misfire detection time. It is better to correct it. In this way, the misfire determination value of the cylinder in which misfires are continuously detected can be accurately increased and corrected in accordance with the amount of increase in noise level due to continuous misfire, and overcorrection of the misfire determination value can be prevented. it can.

以下、本発明を実施するための最良の形態を具体化した一実施例を説明する。
まず、図1に基づいて点火制御系の回路構成を説明する。
Hereinafter, an embodiment embodying the best mode for carrying out the present invention will be described.
First, the circuit configuration of the ignition control system will be described with reference to FIG.

点火コイル21の一次コイル22の一端はバッテリ23に接続され、該一次コイル22の他端は、イグナイタ24に内蔵されたパワートランジスタ25のコレクタに接続されている。二次コイル26の一端は点火プラグ27に接続され、該二次コイル26の他端は、2つのツェナーダイオード28,29を介してグランドに接続されている。   One end of the primary coil 22 of the ignition coil 21 is connected to the battery 23, and the other end of the primary coil 22 is connected to the collector of the power transistor 25 built in the igniter 24. One end of the secondary coil 26 is connected to a spark plug 27, and the other end of the secondary coil 26 is connected to the ground via two Zener diodes 28 and 29.

2つのツェナーダイオード28,29は互いに逆向きに直列接続され、一方のツェナーダイオード28にコンデンサ30が並列に接続され、他方のツェナーダイオード29にイオン電流検出抵抗31が並列に接続されている。コンデンサ30とイオン電流検出抵抗31との間の電位Vinが抵抗32を介して反転増幅回路33の反転入力端子(−)に入力されて反転増幅され、この反転増幅回路33の出力電圧Vがイオン電流検出信号としてエンジン制御回路34に入力される。イオン電流検出回路35は、ツェナーダイオード28,29、コンデンサ30、イオン電流検出抵抗31、反転増幅回路33等から構成され、このイオン電流検出回路35とエンジン制御回路34とによってイオン電流検出装置(イオン電流検出手段)が構成されている。   The two Zener diodes 28 and 29 are connected in series in opposite directions, a capacitor 30 is connected in parallel to one Zener diode 28, and an ion current detection resistor 31 is connected in parallel to the other Zener diode 29. A potential Vin between the capacitor 30 and the ionic current detection resistor 31 is input to the inverting input terminal (−) of the inverting amplifier circuit 33 via the resistor 32 and is inverted and amplified. The output voltage V of the inverting amplifier circuit 33 is ionized. The current detection signal is input to the engine control circuit 34. The ion current detection circuit 35 includes Zener diodes 28 and 29, a capacitor 30, an ion current detection resistor 31, an inverting amplification circuit 33, and the like. The ion current detection circuit 35 and the engine control circuit 34 are used to detect an ion current detection device (ion ion). Current detection means).

エンジン運転中は、エンジン制御回路34からイグナイタ24に送信される点火信号の立ち上がり/立ち下がりでパワートランジスタ25がオン/オフする。パワートランジスタ25がオンすると、バッテリ23から一次コイル22に一次電流が流れ、その後、パワートランジスタ25がオフすると、一次コイル22の一次電流が遮断されて、二次コイル26に高電圧が電磁誘導され、この高電圧によって点火プラグ27の電極36,37間に火花放電が発生する。この火花放電電流は、点火プラグ27の接地電極37から中心電極36へ流れ、二次コイル26を経てコンデンサ30に充電されると共に、ツェナーダイオード28,29を経てグランド側に流れる。コンデンサ30の充電後は、ツェナーダイオード28のツェナー電圧によって規制されるコンデンサ30の充電電圧を電源としてイオン電流検出回路35が駆動され、後述するようにしてイオン電流が検出される。   During engine operation, the power transistor 25 is turned on / off at the rise / fall of the ignition signal transmitted from the engine control circuit 34 to the igniter 24. When the power transistor 25 is turned on, a primary current flows from the battery 23 to the primary coil 22. After that, when the power transistor 25 is turned off, the primary current of the primary coil 22 is cut off and a high voltage is electromagnetically induced in the secondary coil 26. This high voltage causes spark discharge between the electrodes 36 and 37 of the spark plug 27. This spark discharge current flows from the ground electrode 37 of the spark plug 27 to the center electrode 36, is charged to the capacitor 30 via the secondary coil 26, and flows to the ground side via the Zener diodes 28 and 29. After the capacitor 30 is charged, the ion current detection circuit 35 is driven using the charging voltage of the capacitor 30 regulated by the Zener voltage of the Zener diode 28 as a power source, and the ion current is detected as described later.

これに対して、イオン電流は、火花放電電流とは反対方向に流れる。つまり、点火終了後は、コンデンサ30の充電電圧によって点火プラグ27の電極36,37間に電圧が印加されるため、気筒内で混合気が燃焼する際に発生するイオンによって電極36,37間にイオン電流が流れるが、このイオン電流は、中心電極36から接地電極37へ流れ、更に、グランド側からイオン電流検出抵抗31を通ってコンデンサ30に流れる。この際、イオン電流検出抵抗31に流れるイオン電流の変化に応じて反転増幅回路33の入力電位Vinが変化し、反転増幅回路33の出力端子からイオン電流に応じた電圧Vがエンジン制御回路34に出力される。この反転増幅回路33の出力電圧Vからイオン電流が検出される。   On the other hand, the ion current flows in the opposite direction to the spark discharge current. In other words, after ignition is finished, a voltage is applied between the electrodes 36 and 37 of the spark plug 27 by the charging voltage of the capacitor 30, so that ions generated when the air-fuel mixture burns in the cylinder are connected between the electrodes 36 and 37. Although an ionic current flows, the ionic current flows from the center electrode 36 to the ground electrode 37, and further flows from the ground side through the ion current detection resistor 31 to the capacitor 30. At this time, the input potential Vin of the inverting amplifier circuit 33 changes according to the change of the ionic current flowing through the ionic current detection resistor 31, and the voltage V corresponding to the ionic current is output to the engine control circuit 34 from the output terminal of the inverting amplifier circuit 33. Is output. An ion current is detected from the output voltage V of the inverting amplifier circuit 33.

エンジン制御回路34は、マイクロコンピュータを主体として構成され、回転角検出センサ38(クランク角センサ)、負荷検出センサ39(吸入空気量検出センサ、吸気圧検出センサ)等により検出した運転状態に応じて燃料噴射制御や点火時期制御を行うと共に、イオン電流検出回路35の出力を利用して、各気筒毎に所定の燃焼イオン検出区間におけるイオン電流のピーク値Ii 、積分値Qi 、イオン出力時間Ti の少なくとも1つを検出して、その検出値を失火判定値と比較して失火の有無を判定する。   The engine control circuit 34 is mainly composed of a microcomputer, and corresponds to an operating state detected by a rotation angle detection sensor 38 (crank angle sensor), a load detection sensor 39 (intake air amount detection sensor, intake pressure detection sensor) and the like. In addition to performing fuel injection control and ignition timing control, the output of the ion current detection circuit 35 is used to determine the peak value Ii, integral value Qi, and ion output time Ti of the ion current in a predetermined combustion ion detection section for each cylinder. At least one is detected, and the detected value is compared with a misfire determination value to determine the presence or absence of misfire.

次に、イオン電流検出回路35で検出するイオン電流波形が、正常燃焼時とノイズ発生時にどの様に変化するかを図2を用いて説明する。   Next, how the ion current waveform detected by the ion current detection circuit 35 changes during normal combustion and noise generation will be described with reference to FIG.

図2(d)に示すように、点火コイル21の一次側巻線22への通電開始直後(点火信号OFF→ON切換直後)に、短い時間幅のパルス状のノイズ電流が誘起され、点火直後(点火信号ON→OFF切換直後)に、点火コイル21の二次側の残留磁気エネルギによってLC共振が発生し、その後、正常燃焼時には燃焼により発生したイオン(以下「燃焼イオン」という)の電流波形が現れる。本実施例では、各気筒毎にLC共振後に現れる燃焼イオンのピーク値Ii 、積分値Qi 、イオン電流出力時間Ti の少なくとも1つを検出して、その検出値を失火判定値と比較して失火の有無を判定する。   As shown in FIG. 2 (d), immediately after the start of energization of the primary winding 22 of the ignition coil 21 (immediately after the ignition signal is switched from OFF to ON), a pulse-like noise current having a short time width is induced. LC resonance is generated by the residual magnetic energy on the secondary side of the ignition coil 21 (immediately after the ignition signal is switched from ON to OFF), and thereafter, a current waveform of ions (hereinafter referred to as “combustion ions”) generated by combustion during normal combustion. Appears. In this embodiment, at least one of the peak value Ii, the integral value Qi, and the ion current output time Ti of the combustion ions appearing after LC resonance is detected for each cylinder, and the detected value is compared with the misfire determination value. The presence or absence of is determined.

一方、点火プラグ27のガイシ部に帯電した電荷により発生するノイズには、図2(e)に示すように、筒内圧力が低下してから間欠的に発生するスパイクノイズがあるが、その他、点火直後の筒内圧力が高い時期に連続的に発生する連続コロナ放電ノイズもある。このような帯電電荷によるノイズは、帯電電荷量が多くなるほど、ノイズレベルが大きくなるという関係がある。   On the other hand, as shown in FIG. 2 (e), the noise generated by the electric charge charged in the insulator portion of the spark plug 27 includes spike noise that occurs intermittently after the in-cylinder pressure decreases, There is also a continuous corona discharge noise that occurs continuously when the cylinder pressure immediately after ignition is high. Such noise due to charged charges has a relationship that the noise level increases as the amount of charged charges increases.

また、帯電電荷によるノイズの特徴は、燃焼時には燃焼イオン(電離ガス)により帯電電荷が中和される作用により帯電電荷量が減少してノイズの影響がほとんど無くなるが、失火時には、燃焼イオンが発生しないため、上述した燃焼イオンによる帯電電荷の中和作用が発生せず、帯電電荷量が減少しないため、ノイズレベルが大きくなる傾向がある。また、図3に示すように、失火が連続して発生する場合は、その連続失火回数が多くなるほど、点火プラグ27の帯電電荷量が増加してノイズレベルが大きくなる傾向があるが、帯電電荷量やノイズレベルは無制限に増加するものではなく、その増加にも一定の限界がある。   In addition, noise due to charged charge is characterized by the fact that the charged charge is reduced by the action of neutralizing the charged charge by combustion ions (ionized gas) during combustion and the effect of noise is almost eliminated. However, in the event of a misfire, combustion ions are generated. Therefore, the above-described neutralization effect of the charged charges by the combustion ions does not occur, and the amount of charged charges does not decrease, so that the noise level tends to increase. In addition, as shown in FIG. 3, when misfires occur continuously, as the number of consecutive misfires increases, the amount of charged charge of the spark plug 27 tends to increase and the noise level tends to increase. The amount and noise level do not increase indefinitely, and the increase has certain limits.

これらの事情を考慮して、本実施例では、図3に示すように、いずれかの気筒で失火を検出する毎に当該失火気筒の失火判定値を所定量ずつ増加補正し、失火検出により失火判定値が増加補正された気筒について着火を検出したときに当該失火判定値を失火検出前のベース失火判定値Vth0 (最小の失火判定値)に復帰させるようにしている。この際、失火が連続して検出される気筒の失火判定値は、上限ガード値Vthmax を越えないようにガード処理され、失火判定値の過補正が防止される。このようにすれば、各気筒毎に失火判定値を帯電電荷によるノイズレベルの増減に合わせて精度良く可変設定することができる。   In view of these circumstances, in this embodiment, as shown in FIG. 3, every time a misfire is detected in any cylinder, the misfire determination value of the misfire cylinder is increased by a predetermined amount, and misfire is detected by misfire detection. When ignition is detected for the cylinder whose determination value is increased and corrected, the misfire determination value is returned to the base misfire determination value Vth0 (minimum misfire determination value) before the misfire is detected. At this time, the misfire determination value of the cylinder in which misfire is continuously detected is guarded so as not to exceed the upper limit guard value Vthmax, and overcorrection of the misfire determination value is prevented. In this way, it is possible to variably set the misfire determination value for each cylinder in accordance with the increase or decrease of the noise level due to the charged charge.

以上説明した本実施例の失火判定値の可変設定と失火判定は、エンジン制御回路34によって図4及び図5の各ルーチンに従って実行される。以下、これら各ルーチンの処理内容を説明する。   The variable setting of the misfire determination value and the misfire determination of the present embodiment described above are executed by the engine control circuit 34 according to the routines of FIGS. The processing contents of these routines will be described below.

[失火検出ルーチン]
図4の失火検出ルーチンは、エンジン運転中に各気筒毎に所定周期で実行される。本ルーチンが起動されると、まずステップ101で、回転角検出センサ38、負荷検出センサ39等の出力信号に基づいてエンジン回転速度Ne、負荷率等のエンジン運転状態を検出する。この後、ステップ102に進み、現在のエンジン運転状態に応じて燃焼イオン検出区間を設定する。図2の例では、燃焼イオン検出区間を点火後からATDC180℃Aまでの区間に設定している。尚、この燃焼イオン検出区間は、予め決められた一定の区間に設定するようにしても良い。
[Misfire detection routine]
The misfire detection routine of FIG. 4 is executed at a predetermined cycle for each cylinder during engine operation. When this routine is started, first, in step 101, the engine operating state such as the engine rotation speed Ne and the load factor is detected based on output signals from the rotation angle detection sensor 38, the load detection sensor 39, and the like. Thereafter, the process proceeds to step 102 where a combustion ion detection section is set according to the current engine operating state. In the example of FIG. 2, the combustion ion detection section is set to the section from after ignition to ATDC 180 ° C. In addition, you may make it set this combustion ion detection area to the predetermined fixed area.

この後、ステップ103に進み、現在のクランク角が燃焼イオン検出区間内であるか否かを判定し、燃焼イオン検出区間内であれば、ステップ104に進み、イオン電流検出回路35で検出したイオン電流検出値iを所定のサンプリング周期(例えば20μs周期)で読み込み、次のステップ105で、燃焼イオン検出区間のイオン電流ピーク値Ii を検出する。尚、イオン電流ピーク値Ii に代えて、イオン電流積分値Qi (検出電荷量)又はイオン電流出力時間Ti を検出するようにしても良い。   Thereafter, the process proceeds to step 103, where it is determined whether or not the current crank angle is within the combustion ion detection section, and if it is within the combustion ion detection section, the process proceeds to step 104 and the ions detected by the ion current detection circuit 35 are detected. The current detection value i is read at a predetermined sampling period (for example, 20 μs period), and at the next step 105, the ion current peak value Ii in the combustion ion detection section is detected. Instead of the ion current peak value Ii, the ion current integrated value Qi (detected charge amount) or the ion current output time Ti may be detected.

その後、燃焼イオン検出区間終了タイミングになった時点で、上記ステップ103で、「No」と判定されて、ステップ106で「Yes」と判定され、ステップ107に進み、後述する図5の失火判定値設定ルーチンを実行して、各気筒毎に失火の有無に応じて失火判定値Vth(j) を可変設定する。ここで、(j) は気筒番号を示す。   Thereafter, when the combustion ion detection section end timing is reached, “No” is determined in Step 103, “Yes” is determined in Step 106, the process proceeds to Step 107, and the misfire determination value of FIG. A setting routine is executed to variably set the misfire determination value Vth (j) for each cylinder according to the presence or absence of misfire. Here, (j) indicates a cylinder number.

この後、ステップ108に進み、イオン電流ピーク値Ii を失火判定値Vth(j) と比較し、イオン電流ピーク値Ii が失火判定値Vth(j) よりも大きければ、ステップ109に進み、着火と判定し、当該着火気筒(j) の失火検出フラグFmf(j) を「0」にセットする。これに対して、イオン電流ピーク値Ii が失火判定値Vth(j) 以下であれば、ステップ110に進み、失火と判定し、当該失火気筒(j) の失火検出フラグFmf(j) を「1」にセットする。尚、イオン電流ピーク値Ii に代えて、イオン電流積分値Qi 又はイオン電流出力時間Ti を失火判定値Vth(j) と比較して失火/着火を判定するようにしても良い。   Thereafter, the process proceeds to step 108, where the ion current peak value Ii is compared with the misfire determination value Vth (j). If the ion current peak value Ii is larger than the misfire determination value Vth (j), the process proceeds to step 109, where ignition and Determination is made and the misfire detection flag Fmf (j) of the ignition cylinder (j) is set to “0”. On the other hand, if the ion current peak value Ii is equal to or less than the misfire determination value Vth (j), the process proceeds to step 110, where it is determined that misfire has occurred, and the misfire detection flag Fmf (j) of the misfire cylinder (j) is set to “1”. Set to "". Instead of the ionic current peak value Ii, the ionic current integrated value Qi or the ionic current output time Ti may be compared with the misfire determination value Vth (j) to determine misfire / ignition.

[失火判定値設定ルーチン]
図5の失火判定値設定ルーチンは、上記図4の失火検出ルーチンのステップ107で実行されるサブルーチンであり、特許請求の範囲でいう気筒別失火判定値設定手段としての役割を果たす。本ルーチンが起動されると、まずステップ201で、回転角検出センサ38、負荷検出センサ39等の出力信号に基づいてエンジン回転速度Ne、負荷率等のエンジン運転状態を検出する。この後、ステップ202に進み、現在のエンジン運転状態に応じてベース失火判定値Vth0 (最小の失火判定値)と連続失火時の失火判定値の上限ガード値Vthmax (最大の失火判定値)をマップ等により算出する。
[Misfire determination value setting routine]
The misfire determination value setting routine of FIG. 5 is a subroutine executed in step 107 of the misfire detection routine of FIG. 4 and serves as cylinder misfire determination value setting means in the claims. When this routine is started, first, in step 201, the engine operating state such as the engine rotation speed Ne and the load factor is detected based on output signals from the rotation angle detection sensor 38, the load detection sensor 39, and the like. Thereafter, the process proceeds to step 202, where the base misfire determination value Vth0 (minimum misfire determination value) and the upper guard value Vthmax (maximum misfire determination value) of the misfire determination value at the time of continuous misfire are mapped according to the current engine operating state. Etc. are calculated.

尚、ベース失火判定値Vth0 と上限ガード値Vthmax は、それぞれ、予め決められた一定の値に設定するようにしても良い。また、上限ガード値Vthmax については、エンジン運転状態から推定される点火プラグ27の帯電電荷量に応じてマップ等により算出するようにしても良い。   The base misfire determination value Vth0 and the upper guard value Vthmax may be set to predetermined constant values, respectively. Further, the upper guard value Vthmax may be calculated by a map or the like according to the charge amount of the spark plug 27 estimated from the engine operating state.

この後、ステップ203に進み、失火判定値算出条件が成立しているか否かを判定する。例えば、イニシャル処理時や、失火検出が不要な運転条件であれば、失火判定値算出条件が不成立となり、ステップ204に進み、失火判定値Vth(j) をベース失火判定値Vth0 に設定する。   Thereafter, the process proceeds to step 203, and it is determined whether or not a misfire determination value calculation condition is satisfied. For example, the misfire determination value calculation condition is not satisfied during the initial process or if the misfire detection is not necessary, and the process proceeds to step 204 where the misfire determination value Vth (j) is set to the base misfire determination value Vth0.

これに対して、現在のエンジン運転条件が失火検出が必要な運転条件であれば、失火判定値算出条件が成立して、ステップ205に進み、前記図4の失火検出ルーチンで検出した気筒毎の連続失火回数Nmf(j) をカウントする。この連続失火回数Nmf(j) は、着火検出時{失火検出フラグFmf(j) =0の時}に0にリセットされる。   On the other hand, if the current engine operating condition is an operating condition that requires misfire detection, the misfire determination value calculation condition is satisfied, and the routine proceeds to step 205 for each cylinder detected in the misfire detection routine of FIG. Count the number of consecutive misfires Nmf (j). This number of consecutive misfires Nmf (j) is reset to 0 when ignition is detected {when misfire detection flag Fmf (j) = 0}.

この後、ステップ206に進み、気筒毎の連続失火回数Nmf(j) が例えば2回以上であるか否かを判定し、連続失火回数Nmf(j) が2回以上でない場合(つまり着火時又は失火回数が1回のみの場合)には、ステップ204に進み、失火判定値Vth(j) をベース失火判定値Vth0 に設定する。   Thereafter, the routine proceeds to step 206, where it is determined whether or not the number of consecutive misfires Nmf (j) for each cylinder is 2 or more, for example, and if the number of consecutive misfires Nmf (j) is not 2 or more (that is, at the time of ignition or If the number of misfires is only one), the routine proceeds to step 204, where the misfire determination value Vth (j) is set to the base misfire determination value Vth0.

一方、上記ステップ206で、気筒毎の連続失火回数Nmf(j) が2回以上であると判定されれば、ステップ207に進み、ベース失火判定値Vth0 に加算する増加補正量Δを、連続失火回数Nmf(j) 又は連続失火検出時間に応じてマップ等により算出する。尚、この増加補正量Δは、エンジン運転条件から推定される点火プラグ27の帯電電荷量に応じてエンジン運転条件毎にマップ等により設定しても良い。   On the other hand, if it is determined in step 206 that the number of consecutive misfires Nmf (j) for each cylinder is 2 or more, the process proceeds to step 207, and the incremental correction amount Δ to be added to the base misfire determination value Vth0 is set to the continuous misfire. It is calculated by a map or the like according to the number of times Nmf (j) or the continuous misfire detection time. The increase correction amount Δ may be set by a map or the like for each engine operating condition according to the charged charge amount of the spark plug 27 estimated from the engine operating condition.

この後、ステップ208に進み、ベース失火判定値Vth0 に増加補正量Δを加算することで、連続失火回数Nmf(j) 又は連続失火検出時間に応じて増加補正した失火判定値Vth(j) を求める。   Thereafter, the process proceeds to step 208, and the misfire determination value Vth (j) corrected to increase in accordance with the number of consecutive misfires Nmf (j) or the continuous misfire detection time is obtained by adding the increase correction amount Δ to the base misfire determination value Vth0. Ask.

そして、次のステップ209で、増加補正後の失火判定値Vth(j) を上限ガード値Vthmax と比較し、増加補正後の失火判定値Vth(j) が上限ガード値Vthmax を越えていれば、ステップ210に進み、今回の失火判定値Vth(j) を上限ガード値Vthmax とする(つまり上限ガード値Vthmax で失火判定値Vth(j) をガード処理する)。一方、上記ステップ209で、増加補正後の失火判定値Vth(j) が上限ガード値Vthmax 以下と判定されれば、増加補正後の失火判定値Vth(j) をそのまま今回の失火判定値Vth(j) とする。   In the next step 209, the misfire determination value Vth (j) after the increase correction is compared with the upper limit guard value Vthmax, and if the misfire determination value Vth (j) after the increase correction exceeds the upper limit guard value Vthmax, In step 210, the current misfire determination value Vth (j) is set as the upper guard value Vthmax (that is, the misfire determination value Vth (j) is guarded with the upper guard value Vthmax). On the other hand, if it is determined in step 209 that the misfire determination value Vth (j) after the increase correction is equal to or less than the upper limit guard value Vthmax, the misfire determination value Vth (j) after the increase correction is directly used as the current misfire determination value Vth ( j).

以上説明した失火判定値Vth(j) の可変設定の一例を図3を用いて説明する。図3は、ある気筒について連続失火が発生した場合の失火判定値Vth(j) の設定例を示している。この例では、ある時刻t1 で1回目の失火が発生し、連続して2回目の失火が発生した時点t2 で、失火判定値Vth(j) がベース失火判定値Vth0 から所定量増加される。この後、連続失火検出回数が増加する毎にベース失火判定値Vth0 から所定量ずつ増加される。これにより、失火判定値Vth(j) が上限ガード値Vthmax に達した時点t3 で、失火判定値Vth(j) が上限ガード値Vthmax でガード処理される。この後は、連続失火検出回数が増加しても、失火判定値Vth(j) が上限ガード値Vthmax に維持される。その後、イオン電流ピーク値Ii が失火判定値Vth(j) を越えて着火が検出された時点t4 で、次のサイクルの点火時t5 から失火判定値Vth(j) をベース失火判定値Vth0 に復帰させる。   An example of the variable setting of the misfire determination value Vth (j) described above will be described with reference to FIG. FIG. 3 shows a setting example of the misfire determination value Vth (j) when continuous misfire occurs for a certain cylinder. In this example, the first misfire occurs at a certain time t1, and the misfire determination value Vth (j) is increased from the base misfire determination value Vth0 by a predetermined amount at the time t2 when the second misfire occurs continuously. Thereafter, every time the number of consecutive misfire detections increases, the base misfire determination value Vth0 is increased by a predetermined amount. As a result, at time t3 when the misfire determination value Vth (j) reaches the upper guard value Vthmax, the misfire determination value Vth (j) is guarded with the upper guard value Vthmax. Thereafter, even if the number of consecutive misfire detections increases, the misfire determination value Vth (j) is maintained at the upper guard value Vthmax. Thereafter, at time t4 when the ionic current peak value Ii exceeds the misfire determination value Vth (j) and ignition is detected, the misfire determination value Vth (j) is restored to the base misfire determination value Vth0 from the ignition timing t5 of the next cycle. Let

尚、図5の失火判定値設定ルーチンでは、ベース失火判定値Vth0 に加算する増加補正量Δを連続失火回数Nmf(j) 又は連続失火検出時間に応じて算出したが、失火検出毎に前回の失火判定値Vth(j) に加算する失火1回当たりの増加補正量δを算出して、失火検出毎に失火判定値Vth(j) を増加補正量δずつ増加補正するようにしても良い。この場合、増加補正量δは、エンジン運転条件から推定される点火プラグ27の帯電電荷量に応じてエンジン運転条件毎にマップ等により算出しても良いし、予め決められた一定値に設定しても良い。   In the misfire determination value setting routine of FIG. 5, the increase correction amount Δ to be added to the base misfire determination value Vth0 is calculated according to the number of consecutive misfires Nmf (j) or the continuous misfire detection time. An increase correction amount δ per misfire to be added to the misfire determination value Vth (j) may be calculated, and the misfire determination value Vth (j) may be increased and corrected by the increase correction amount δ every time a misfire is detected. In this case, the increase correction amount δ may be calculated by a map or the like for each engine operating condition according to the charged charge amount of the spark plug 27 estimated from the engine operating condition, or set to a predetermined constant value. May be.

また、図5の失火判定値設定ルーチンでは、増加補正量Δをベース失火判定値Vth0 に加算する加算量としたが、ベース失火判定値Vth0 又は前回の失火判定値Vth(j) に乗算する増加倍率を増加補正量としても良い。   In the misfire determination value setting routine of FIG. 5, the increase correction amount Δ is an addition amount that is added to the base misfire determination value Vth0. However, the increase is multiplied by the base misfire determination value Vth0 or the previous misfire determination value Vth (j). The magnification may be used as an increase correction amount.

また、図5の失火判定値設定ルーチンでは、連続失火回数が2回以上の場合に失火判定値Vth(j) をベース失火判定値Vth0 から増加させるようにしたが、失火判定値Vth(j) を増加補正する連続失火回数は2回以上に限定されず、それ以上の回数であっても良い。また、単発的に失火が発生する場合でも、失火を1回検出する毎に、その都度、失火判定値Vth(j) を増加補正するようにしても良い。   In the misfire determination value setting routine of FIG. 5, the misfire determination value Vth (j) is increased from the base misfire determination value Vth0 when the number of consecutive misfires is 2 or more. However, the misfire determination value Vth (j) The number of consecutive misfires for increasing the correction is not limited to two or more, and may be more than that. Further, even when misfire occurs only once, the misfire determination value Vth (j) may be increased and corrected each time a misfire is detected.

また、図5の失火判定値設定ルーチンでは、連続失火から着火に復帰した時に、直ちに失火判定値Vth(j) をベース失火判定値Vth0 に復帰させるようにしたが、連続失火から着火に復帰した時に、その後の着火検出回数に応じて失火判定値Vth(j) を徐々に減少補正して、緩やかにベース失火判定値Vth0 に復帰させるようにしても良い。   Further, in the misfire determination value setting routine of FIG. 5, when the misfire determination value Vth (j) is immediately returned to the base misfire determination value Vth0 when returning from continuous misfire to ignition, the misfire determination value Vth0 is restored from continuous misfire. Sometimes, the misfire determination value Vth (j) may be gradually decreased and corrected according to the number of subsequent ignition detections, and may be gradually returned to the base misfire determination value Vth0.

以上説明した失火判定値Vth(j) の可変設定は、各気筒毎に行われるため、各気筒毎に燃焼状態が異なって、燃焼イオンによる点火プラグ27の帯電電荷の中和作用の発生度合ひいては帯電電荷によるノイズレベルが各気筒毎に異なるのに対応して、各気筒毎に失火判定値Vth(j) を帯電電荷によるノイズレベルに合わせて可変設定することができ、エンジンの全ての気筒で帯電電荷によるノイズを燃焼イオンとして誤検出することを防止できて、失火検出精度を向上させることができる。   Since the misfire determination value Vth (j) described above is variably set for each cylinder, the combustion state is different for each cylinder, and the degree of occurrence of the neutralization effect of the charged charge of the spark plug 27 by the combustion ions, as a result. Corresponding to the fact that the noise level due to the charged electric charge is different for each cylinder, the misfire determination value Vth (j) can be variably set according to the noise level due to the charged electric charge for each cylinder. It is possible to prevent erroneous detection of noise due to charged charges as combustion ions, and to improve misfire detection accuracy.

しかも、本実施例では、失火が連続して検出される気筒の失火判定値Vth(j) を連続失火検出回数又は連続失火検出時間に応じて所定の上限ガード値Vthmax 以下の範囲で増加補正するようにしたので、各気筒毎に失火判定値Vth(j) を帯電電荷によるノイズレベルの増加に合わせて精度良く増加補正できると共に、失火判定値Vth(j) の過補正を防止することができる。   In addition, in this embodiment, the misfire determination value Vth (j) of the cylinder in which misfire is continuously detected is increased and corrected within a predetermined upper guard value Vthmax or less in accordance with the number of consecutive misfire detections or the continuous misfire detection time. Thus, for each cylinder, the misfire determination value Vth (j) can be increased and corrected accurately in accordance with the increase in the noise level due to the charged charge, and overcorrection of the misfire determination value Vth (j) can be prevented. .

本発明の一実施例における点火制御系とイオン電流検出回路の構成を示す回路図である。It is a circuit diagram which shows the structure of the ignition control system and ion current detection circuit in one Example of this invention. 点火信号、筒内圧力、燃焼イオン検出区間、正常燃焼時の検出電流波形、ノイズ発生時の検出電流波形との関係を説明するタイムチャートである。It is a time chart explaining the relationship with an ignition signal, a cylinder pressure, a combustion ion detection area, a detection current waveform at the time of normal combustion, and a detection current waveform at the time of noise occurrence. ある気筒について連続失火が発生した場合の失火判定値Vth(j) の設定例を示すタイムチャートである。It is a time chart which shows the example of a setting of misfire determination value Vth (j) when continuous misfire occurs about a certain cylinder. 失火検出ルーチンの処理の流れを示すフローチャートである。It is a flowchart which shows the flow of a process of a misfire detection routine. 失火判定値設定ルーチンの処理の流れを示すフローチャートである。It is a flowchart which shows the flow of a process of a misfire determination value setting routine.

符号の説明Explanation of symbols

21…点火コイル、22…一次コイル、23…バッテリ、24…イグナイタ、25…パワートランジスタ、26…二次コイル、27…点火プラグ、31…イオン電流検出抵抗、33…反転増幅回路、34…エンジン制御回路(気筒別失火判定値設定手段)、35…イオン電流検出回路(イオン電流検出手段)、36…中心電極、37…接地電極   DESCRIPTION OF SYMBOLS 21 ... Ignition coil, 22 ... Primary coil, 23 ... Battery, 24 ... Igniter, 25 ... Power transistor, 26 ... Secondary coil, 27 ... Spark plug, 31 ... Ion current detection resistor, 33 ... Inversion amplification circuit, 34 ... Engine Control circuit (cylinder misfire determination value setting means), 35 ... ion current detection circuit (ion current detection means), 36 ... center electrode, 37 ... ground electrode

Claims (4)

内燃機関の燃焼室内で混合気の燃焼に伴って発生するイオン電流を点火プラグの電極を介して検出するイオン電流検出手段を備え、前記イオン電流検出手段のイオン電流検出値を失火判定値と比較して失火の有無を判定する内燃機関の失火検出装置において、
内燃機関の各気筒毎に前記失火判定値を燃焼状態に応じて可変設定する気筒別失火判定値設定手段を備えていることを特徴とする内燃機関の失火検出装置。
Ion current detection means for detecting ion current generated by combustion of the air-fuel mixture in the combustion chamber of the internal combustion engine through the electrode of the spark plug, and comparing the ion current detection value of the ion current detection means with the misfire determination value In the misfire detection device for an internal combustion engine that determines the presence or absence of misfire,
A misfire detection apparatus for an internal combustion engine, comprising: a misfire determination value setting unit for each cylinder that variably sets the misfire determination value for each cylinder of the internal combustion engine according to a combustion state.
前記気筒別失火判定値設定手段は、内燃機関の各気筒毎に失火検出時と着火検出時とで前記失火判定値を可変設定することを特徴とする請求項1に記載の内燃機関の失火検出装置。   2. The misfire detection of the internal combustion engine according to claim 1, wherein the cylinder misfire determination value setting means variably sets the misfire determination value for each cylinder of the internal combustion engine depending on whether misfire is detected or when ignition is detected. apparatus. 前記気筒別失火判定値設定手段は、いずれかの気筒で失火を検出したときに当該失火気筒の前記失火判定値を増加補正する手段と、失火検出により前記失火判定値が増加補正された気筒について着火を検出したときに当該失火判定値を減少補正し又は失火検出前の失火判定値に復帰させる手段とを有することを特徴とする請求項2に記載の内燃機関の失火検出装置。   The cylinder-specific misfire determination value setting means includes means for increasing and correcting the misfire determination value of the misfire cylinder when a misfire is detected in any cylinder, and a cylinder in which the misfire determination value is increased and corrected by misfire detection. 3. The misfire detection apparatus for an internal combustion engine according to claim 2, further comprising means for reducing and correcting the misfire determination value or returning to the misfire determination value before the misfire detection when the ignition is detected. 前記気筒別失火判定値設定手段は、失火が連続して検出される気筒の失火判定値を連続失火検出回数又は連続失火検出時間に応じて所定の上限ガード値以下の範囲で増加補正することを特徴とする請求項3に記載の内燃機関の失火検出装置。   The cylinder misfire determination value setting means corrects an increase in the misfire determination value of a cylinder in which misfire is continuously detected within a range equal to or less than a predetermined upper limit guard value according to the number of consecutive misfire detections or the continuous misfire detection time. The misfire detection apparatus for an internal combustion engine according to claim 3,
JP2006166935A 2006-06-16 2006-06-16 Misfire detection device for internal combustion engine Expired - Fee Related JP4573048B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006166935A JP4573048B2 (en) 2006-06-16 2006-06-16 Misfire detection device for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006166935A JP4573048B2 (en) 2006-06-16 2006-06-16 Misfire detection device for internal combustion engine

Publications (2)

Publication Number Publication Date
JP2007332895A true JP2007332895A (en) 2007-12-27
JP4573048B2 JP4573048B2 (en) 2010-11-04

Family

ID=38932596

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006166935A Expired - Fee Related JP4573048B2 (en) 2006-06-16 2006-06-16 Misfire detection device for internal combustion engine

Country Status (1)

Country Link
JP (1) JP4573048B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012167655A (en) * 2011-02-17 2012-09-06 Diamond Electric Mfg Co Ltd Combustion control device of internal combustion engine
KR20130021252A (en) * 2011-08-22 2013-03-05 콘티넨탈 오토모티브 시스템 주식회사 Apparatus and method for detecting misfire using varable valve lift apparatus of vehicle
JP2015214896A (en) * 2014-05-08 2015-12-03 三菱電機株式会社 Internal combustion engine control device
IT201900002517A1 (en) * 2019-02-21 2020-08-21 Eldor Corp Spa Electronic device for controlling an ignition coil of an internal combustion engine and related electronic ignition system to detect a pre-ignition in the internal combustion engine
IT201900002513A1 (en) * 2019-02-21 2020-08-21 Eldor Corp Spa Electronic device for controlling an ignition coil of an internal combustion engine and related electronic ignition system to detect a missing combustion in the internal combustion engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0534244A (en) * 1991-08-01 1993-02-09 Hitachi Ltd Combustion state detector of internal combustion engine
JPH0968095A (en) * 1995-08-31 1997-03-11 Nissan Motor Co Ltd Misfire diagnosing device of engine
JP2003097343A (en) * 2001-07-16 2003-04-03 Denso Corp Misfire detecting device for internal combustion engine
JP2003314354A (en) * 2002-04-26 2003-11-06 Mitsubishi Electric Corp Misfire detecting device for internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0534244A (en) * 1991-08-01 1993-02-09 Hitachi Ltd Combustion state detector of internal combustion engine
JPH0968095A (en) * 1995-08-31 1997-03-11 Nissan Motor Co Ltd Misfire diagnosing device of engine
JP2003097343A (en) * 2001-07-16 2003-04-03 Denso Corp Misfire detecting device for internal combustion engine
JP2003314354A (en) * 2002-04-26 2003-11-06 Mitsubishi Electric Corp Misfire detecting device for internal combustion engine

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012167655A (en) * 2011-02-17 2012-09-06 Diamond Electric Mfg Co Ltd Combustion control device of internal combustion engine
KR20130021252A (en) * 2011-08-22 2013-03-05 콘티넨탈 오토모티브 시스템 주식회사 Apparatus and method for detecting misfire using varable valve lift apparatus of vehicle
KR101869324B1 (en) 2011-08-22 2018-07-24 콘티넨탈 오토모티브 시스템 주식회사 Apparatus and method for detecting misfire using varable valve lift apparatus of vehicle
JP2015214896A (en) * 2014-05-08 2015-12-03 三菱電機株式会社 Internal combustion engine control device
US9512792B2 (en) 2014-05-08 2016-12-06 Mitsubishi Electric Corporation Internal combustion engine control apparatus
IT201900002513A1 (en) * 2019-02-21 2020-08-21 Eldor Corp Spa Electronic device for controlling an ignition coil of an internal combustion engine and related electronic ignition system to detect a missing combustion in the internal combustion engine
IT201900002517A1 (en) * 2019-02-21 2020-08-21 Eldor Corp Spa Electronic device for controlling an ignition coil of an internal combustion engine and related electronic ignition system to detect a pre-ignition in the internal combustion engine
WO2020170151A1 (en) * 2019-02-21 2020-08-27 Eldor Corporation S.P.A. Electronic device to control an ignition coil of an internal combustion engine and electronic ignition system thereof for detecting a pre-ignition in the internal combustion engine
WO2020170149A1 (en) * 2019-02-21 2020-08-27 Eldor Corporation S.P.A. Electronic device to control an ignition coil of an internal combustion engine and electronic ignition system thereof for detecting a misfire in the internal combustion engine
CN113710890A (en) * 2019-02-21 2021-11-26 艾尔多股份有限公司 Electronic device for controlling ignition coil of internal combustion engine and electronic ignition system for detecting pre-ignition of internal combustion engine
CN113748265A (en) * 2019-02-21 2021-12-03 艾尔多股份有限公司 Electronic device for controlling ignition coil of internal combustion engine and electronic ignition system for detecting fire of internal combustion engine
US20220120251A1 (en) * 2019-02-21 2022-04-21 Eldor Corporation S.P.A. Electronic device to control an ignition coil of an internal combustion engine and electronic ignition system thereof for detecting a misfire in the internal combustion engine
US11686282B2 (en) 2019-02-21 2023-06-27 Eldor Corporation S.P.A. Electronic device to control an ignition coil of an internal combustion engine and electronic ignition system thereof for detecting a preignition in the internal combustion engine
US11939944B2 (en) * 2019-02-21 2024-03-26 Eldor Corporation S.P.A. Electronic device to control an ignition coil of an internal combustion engine and electronic ignition system thereof for detecting a misfire in the internal combustion engine

Also Published As

Publication number Publication date
JP4573048B2 (en) 2010-11-04

Similar Documents

Publication Publication Date Title
JP3659589B2 (en) Knock control device for internal combustion engine
US6789409B2 (en) Knock detection apparatus for internal combustion engine
US7559319B2 (en) Ignition coil apparatus for an internal combustion engine
US20010052336A1 (en) Knock control apparatus for internal combustion engine
US6722343B2 (en) Knock control device for an internal combustion engine
JP2001082304A (en) Knocking control device of internal combustion engine
JP2003328840A (en) Knock control system for internal combustion engine
JP4714690B2 (en) Ion current detection device for internal combustion engine
JP4573048B2 (en) Misfire detection device for internal combustion engine
JP2001073914A (en) Knock control system of internal combustion engine
US6185984B1 (en) Device for detecting the knocking of an internal combustion engine
JP2003314351A (en) Misfire detecting device for internal combustion engine
JP4100492B2 (en) Misfire detection device for internal combustion engine
JP2008261304A (en) Ion current detection device for internal combustion engine
JP2007309274A (en) Combustion condition determining device for internal combustion engine
JP4970222B2 (en) Combustion control device for internal combustion engine
JP2009281161A (en) Diagnostic device of internal combustion engine
JP2008280947A (en) Knock control device for internal combustion engine
JP2009203864A (en) Combustion state detection device and ignition control system
JP5142087B2 (en) Ion current detection device for internal combustion engine
JP2011140881A (en) Knocking detection device for internal combustion engine
JP2006077762A (en) Ion current detecting device for internal combustion engine
WO2019049446A1 (en) Misfire occurrence determination device, misfire occurrence determination system, misfire occurrence determination method, and program
JPH11270451A (en) Knocking sensing device of internal combustion engine
JP2009057839A (en) Misfire detection system for internal combustion engine

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20080617

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100317

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100324

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100428

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20100721

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20100803

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130827

Year of fee payment: 3

LAPS Cancellation because of no payment of annual fees