JPH11343919A - Cylinder discriminating device of engine - Google Patents
Cylinder discriminating device of engineInfo
- Publication number
- JPH11343919A JPH11343919A JP10152604A JP15260498A JPH11343919A JP H11343919 A JPH11343919 A JP H11343919A JP 10152604 A JP10152604 A JP 10152604A JP 15260498 A JP15260498 A JP 15260498A JP H11343919 A JPH11343919 A JP H11343919A
- Authority
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- Japan
- Prior art keywords
- cylinder
- result
- discrimination
- cylinder discrimination
- discriminating
- 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.)
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- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はエンジンの気筒判別
装置に関し、詳しくは、気筒判別信号に基づく気筒判別
結果の異常を診断する技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder discriminating apparatus for an engine, and more particularly to a technique for diagnosing an abnormality in a cylinder discrimination result based on a cylinder discrimination signal.
【０００２】[0002]
【従来の技術】従来から、気筒別の燃料噴射制御や点火
時期制御等のために、気筒判別が行われていた。前記気
筒判別は、例えば、気筒間の行程位相差毎に出力され燃
料噴射や点火時期の基準となる基準信号の間で、前記基
準信号が対応する気筒をパルス数で示す気筒判別信号を
出力させ、該気筒判別信号のパルス数を前記基準信号の
間でそれぞれにカウントすることで行われていた。2. Description of the Related Art Conventionally, cylinder discrimination has been performed for fuel injection control and ignition timing control for each cylinder. The cylinder discrimination is performed, for example, by outputting a cylinder discrimination signal indicating a cylinder corresponding to the reference signal by a pulse number between reference signals output for each stroke phase difference between cylinders and serving as a reference for fuel injection and ignition timing. This is performed by counting the number of pulses of the cylinder discrimination signal between the reference signals.
【０００３】[0003]
【発明が解決しようとする課題】ところが、前記気筒判
別信号の出力ラインにノイズが重畳するなどしてパルス
数が誤ってカウントされ、これにより気筒判別に誤りを
生じ、本来の気筒とは異なる気筒において燃料噴射や点
火を行わせてしまう可能性があった。本発明は上記問題
点に鑑みなされたものであり、ノイズの重畳のような断
続的な異常に対して確実かつ応答良く異常診断が行える
エンジンの気筒判別装置を提供することを目的とする。However, the number of pulses is erroneously counted because noise is superimposed on the output line of the cylinder discrimination signal, thereby causing an error in cylinder discrimination and a cylinder different from the original cylinder. There is a possibility that fuel injection and ignition may be performed in SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide an engine cylinder discriminating apparatus capable of performing an abnormality diagnosis reliably and responsively with respect to an intermittent abnormality such as superposition of noise.
【０００４】また、気筒判別の異常時であっても、本来
の気筒判別に基づく噴射，点火時期制御を行わせること
ができるエンジンの気筒判別装置を提供することを目的
とする。It is another object of the present invention to provide a cylinder discriminating device for an engine capable of performing injection and ignition timing control based on the original cylinder discrimination even when the cylinder discrimination is abnormal.
【０００５】[0005]
【課題を解決するための手段】そのため、請求項１記載
の発明に係るエンジンの気筒判別装置は、気筒判別信号
に基づき気筒間の行程位相差毎に気筒判別を行うエンジ
ンの気筒判別装置において、前記気筒判別信号に基づく
前回の気筒判別結果から今回の気筒判別結果を予測し、
該予測した気筒判別結果と前記気筒判別信号に基づく判
別結果とが異なるときに、前記気筒判別信号に基づく判
別結果の異常を診断するよう構成した。According to a first aspect of the present invention, there is provided an engine cylinder discriminating apparatus for performing cylinder discrimination for each stroke phase difference between cylinders based on a cylinder discriminating signal. Predict the current cylinder discrimination result from the previous cylinder discrimination result based on the cylinder discrimination signal,
When the predicted cylinder discrimination result is different from the discrimination result based on the cylinder discrimination signal, an abnormality in the discrimination result based on the cylinder discrimination signal is diagnosed.
【０００６】かかる構成によると、行程位相差毎に気筒
判別信号に基づき気筒判別を行うが、気筒判別される気
筒順は予め固定されることになるので（例えば４気筒エ
ンジンで＃１→＃３→＃４→＃２）、今回の気筒判別の
結果から次に判別されるであろう気筒を予測することが
できる。そこで、前回の気筒判別結果から今回の気筒判
別結果を予測し、今回における気筒判別結果が予測と異
なるときには、今回の気筒判別信号に基づく気筒判別結
果が誤っているものと判断する。According to this configuration, cylinder discrimination is performed based on the cylinder discrimination signal for each stroke phase difference, but the order of cylinder discrimination is fixed in advance (for example, # 1 → # 3 in a four-cylinder engine). → # 4 → # 2), it is possible to predict the cylinder that will be determined next from the result of the current cylinder determination. Therefore, the current cylinder discrimination result is predicted from the previous cylinder discrimination result, and if the current cylinder discrimination result is different from the prediction, it is determined that the cylinder discrimination result based on the current cylinder discrimination signal is incorrect.
【０００７】請求項１記載の発明に係るエンジンの気筒
判別装置は、図１に示すように構成される。図１におい
て、気筒判別信号出力手段は、気筒間の行程位相差毎に
気筒判別信号を出力し、気筒判別手段は、気筒判別信号
出力手段から出力される気筒判別信号に基づいて前記行
程位相差毎に気筒判別を行う。An engine cylinder discriminating apparatus according to the first aspect of the present invention is configured as shown in FIG. In FIG. 1, a cylinder discrimination signal output means outputs a cylinder discrimination signal for each stroke phase difference between cylinders, and the cylinder discrimination means outputs the stroke phase difference based on the cylinder discrimination signal output from the cylinder discrimination signal output means. Cylinder discrimination is performed every time.
【０００８】一方、気筒判別結果予測手段は、気筒判別
手段による前回の判別結果から今回の気筒判別結果を予
測する。そして、判別結果診断手段は、気筒判別結果予
測手段で予測された気筒判別結果と、気筒判別手段によ
る気筒判別結果とを比較し、両者が異なるときに前記気
筒判別手段の異常を診断する。On the other hand, the cylinder discrimination result prediction means predicts the current cylinder discrimination result from the previous discrimination result by the cylinder discrimination means. Then, the discrimination result diagnosis means compares the cylinder discrimination result predicted by the cylinder discrimination result prediction means with the cylinder discrimination result by the cylinder discrimination means, and diagnoses an abnormality of the cylinder discrimination means when both are different.
【０００９】かかる構成によると、気筒判別手段による
前回の判別結果から判別結果予測手段が今回の判別結果
を予測し、予測した気筒と異なる気筒が気筒判別手段で
判別されたときには、今回の気筒判別手段による判別結
果が誤っていると診断する。請求項３記載の発明では、
前記判別結果診断手段により前記気筒判別手段の異常が
診断されたときに、前記気筒判別手段による判別結果を
用いたエンジン制御を停止させるエンジン制御停止手段
を設ける構成とした。According to this structure, the discrimination result predicting means predicts the present discrimination result from the previous discrimination result by the cylinder discriminating means. When a cylinder different from the predicted cylinder is discriminated by the cylinder discriminating means, the current cylinder discrimination Diagnosing that the determination result by the means is incorrect. In the invention according to claim 3,
An engine control stopping means for stopping engine control using the result of the determination by the cylinder discriminating means when the abnormality of the cylinder discriminating means is diagnosed by the discrimination result diagnosing means.
【００１０】かかる構成によると、気筒判別手段の気筒
判別結果が誤っていると診断されたときには、そのまま
気筒判別手段の気筒判別結果に基づいて気筒別の噴射，
点火時期制御を行わせると、本来とは異なる気筒におい
て燃料噴射や点火が行われることになってしまうので、
気筒判別手段の気筒判別結果に基づく燃料噴射や点火を
停止し、少なくとも誤った気筒に対する制御が行われる
ことを回避する。With this configuration, when it is diagnosed that the cylinder discriminating result of the cylinder discriminating means is incorrect, injection for each cylinder is performed based on the cylinder discriminating result of the cylinder discriminating means.
If the ignition timing control is performed, fuel injection and ignition will be performed in a cylinder different from the original, so
The fuel injection and the ignition based on the result of the cylinder discrimination by the cylinder discriminating means are stopped, and at least the control for the wrong cylinder is avoided.
【００１１】請求項４記載の発明では、前記判別結果診
断手段により前記気筒判別手段の異常が診断されたとき
に、前記気筒判別手段による判別結果を用いたエンジン
制御に代えて、前記気筒判別結果予測手段による予測結
果に基づいたエンジン制御を行わせるエンジン制御切り
換え手段を設ける構成とした。かかる構成によると、気
筒判別手段による判別結果が誤っていると診断される
と、この誤った判別結果に基づくエンジン制御を停止す
る一方、本来は前回の判別結果から予測した判別結果が
得られるはずであったから、前記予測結果に基づいてエ
ンジン制御を行わせることで、本来の気筒において燃料
噴射，点火が行われるようにする。In the invention according to claim 4, when the abnormality of the cylinder discriminating means is diagnosed by the discrimination result diagnosing means, the cylinder discrimination result is replaced with the engine control using the discrimination result by the cylinder discriminating means. An engine control switching means for performing engine control based on the prediction result by the prediction means is provided. With this configuration, if it is diagnosed that the discrimination result by the cylinder discriminating unit is incorrect, the engine control based on the incorrect discrimination result is stopped, while the discrimination result originally predicted from the previous discrimination result should be obtained. Therefore, by performing engine control based on the prediction result, fuel injection and ignition are performed in the original cylinder.
【００１２】[0012]
【発明の効果】請求項１，２記載の発明によると、気筒
判別信号に基づいて気筒判別が行われる毎に、今回の判
別結果が正しいか否かを診断できるので、気筒判別信号
の出力ラインにノイズが重畳するような断続的な要因に
よる異常であっても、確実かつ応答良く診断できるとい
う効果がある。According to the first and second aspects of the present invention, it is possible to diagnose whether or not the current discrimination result is correct each time the cylinder discrimination is performed based on the cylinder discrimination signal. Even if an abnormality is caused by an intermittent factor such that noise is superimposed on the data, there is an effect that a diagnosis can be made reliably and responsively.
【００１３】請求項３記載の発明によると、誤った気筒
判別結果に基づいてエンジン制御が行われることを回避
でき、燃料噴射や点火が誤った気筒に対して行われるこ
とを防止できるという効果がある。請求項４記載の発明
によると、気筒判別信号から正しく気筒判別が行えない
状態であっても、所期の気筒を対象として制御を行わせ
ることができ、以て、気筒判別の異常が運転性に影響を
与えることを回避できるという効果がある。According to the third aspect of the present invention, it is possible to prevent engine control from being performed based on an incorrect cylinder determination result, and to prevent fuel injection and ignition from being performed on an incorrect cylinder. is there. According to the fourth aspect of the present invention, even in a state where cylinder discrimination cannot be correctly performed from the cylinder discrimination signal, control can be performed for the intended cylinder, so that an abnormality in the cylinder discrimination may cause the drivability. There is an effect that it is possible to avoid influencing the image.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施の形態を図に
基づいて説明する。図２は、実施の形態におけるエンジ
ンのシステム構成図である。エンジン１には、燃料噴射
信号によって駆動し、燃料を燃焼室内に直接噴射する燃
料噴射弁２が各気筒毎にそれぞれ設けられている。尚、
燃料噴射弁２を各気筒の吸気ポート部に設けて、各気筒
の吸気ポート内に燃料を供給する構成であっても良い。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a system configuration diagram of the engine according to the embodiment. The engine 1 is provided with a fuel injection valve 2 that is driven by a fuel injection signal and injects fuel directly into the combustion chamber for each cylinder. still,
The fuel injection valve 2 may be provided at the intake port of each cylinder to supply fuel into the intake port of each cylinder.
【００１５】また、燃焼室に装着されて点火を行う点火
栓３が各気筒毎に設けられる。エンジン１への吸入空気
量は、スロットル弁４で調整されるようになっており、
吸入空気量はエアフローメータ５によって計測される。
また、エンジン１のクランク軸には、各気筒の基準ピス
トン位置（例えばＢＴＤＣ70°）毎、即ち、各気筒の行
程位相差毎に基準信号ＲＥＦを出力するクランク角セン
サ６が取付けられる一方、エンジン１のカム軸には、前
記基準信号ＲＥＦの発生間隔において、パルス数によっ
て気筒を示す気筒判別信号ＣＡＭを出力するカムセンサ
７（気筒判別信号出力手段）が取り付けられている。An ignition plug 3 mounted on the combustion chamber and ignited is provided for each cylinder. The amount of intake air to the engine 1 is adjusted by the throttle valve 4.
The intake air amount is measured by the air flow meter 5.
The crankshaft of the engine 1 is provided with a crank angle sensor 6 for outputting a reference signal REF for each reference piston position (for example, BTDC 70 °) of each cylinder, that is, for each stroke phase difference of each cylinder. A cam sensor 7 (cylinder discrimination signal output means) which outputs a cylinder discrimination signal CAM indicating a cylinder by the number of pulses at the generation interval of the reference signal REF is attached to the camshaft.
【００１６】前記エンジン１を４気筒エンジンとした場
合には、前記基準信号ＲＥＦは180°ＣＡ毎に出力さ
れ、また、４気筒エンジンにおける点火順を＃１→＃３
→＃４→＃２とした場合には、図３に示すように、前記
カムセンサ７は、＃１気筒を示すパルス数＝１のＣＡＭ
信号を発生したＲＥＦ信号間の次のＲＥＦ信号間では、
＃３気筒を示すパルス数＝３のＣＡＭ信号を発生し、更
に、次のＲＦＦ信号間では＃４気筒を示すパルス数＝４
のＣＡＭ信号を発生し、更に、次のＲＥＦ信号間では＃
２気筒を示すパルス数＝２のＣＡＭ信号を発生し、その
後、前記パターンを順次繰り返す。When the engine 1 is a four-cylinder engine, the reference signal REF is output every 180 ° CA, and the ignition order in the four-cylinder engine is changed from # 1 to # 3.
In the case of → # 4 → # 2, as shown in FIG. 3, the cam sensor 7 sets the CAM having the pulse number = 1 indicating the # 1 cylinder.
Between the next REF signals between the REF signals that generated the signals,
A CAM signal with the pulse number = 3 indicating the # 3 cylinder is generated, and the pulse number indicating the # 4 cylinder = 4 between the next RFF signals.
Is generated, and between the next REF signals, #
A CAM signal with the number of pulses = 2 indicating two cylinders is generated, and then the above pattern is sequentially repeated.
【００１７】前記燃料噴射弁２による燃料の噴射時期及
び噴射量を制御すると共に、点火栓３による点火時期を
制御するコントロールユニット８には、前記クランク角
センサ６及びカムセンサ７からの検出信号に基づいて気
筒判別を行い（気筒判別手段）、該気筒判別結果に基づ
き前記基準信号ＲＥＦを計測基準として噴射時期及び／
又は点火時期を各気筒毎に制御する。A control unit 8 for controlling the fuel injection timing and the fuel injection amount by the fuel injection valve 2 and controlling the ignition timing by the spark plug 3 based on the detection signals from the crank angle sensor 6 and the cam sensor 7. (Cylinder discrimination means), and based on the cylinder discrimination result, the injection timing and / or
Alternatively, the ignition timing is controlled for each cylinder.
【００１８】図４は、前記気筒判別に基づくエンジン制
御の様子を示すフローチャートである。この図４のフロ
ーチャートに示すルーチンは、前記クランク角センサ６
から基準信号ＲＥＦが出力される毎に実行されるように
なっており、まず、Ｓ１では、前回の気筒判別結果から
今回の気筒判別結果を予測する（気筒判別結果予測手
段）。FIG. 4 is a flowchart showing the state of engine control based on the cylinder discrimination. The routine shown in the flowchart of FIG.
Is executed every time a reference signal REF is output from the controller. First, in S1, the current cylinder discrimination result is predicted from the previous cylinder discrimination result (cylinder discrimination result prediction means).
【００１９】本実施の形態におけるエンジン１において
は、点火順が＃１→＃３→＃４→＃２の順であるから、
例えば前回＃３気筒が気筒判別されたときには、次に＃
４気筒が判別されるはずであり、前記点火順（＃１→＃
３→＃４→＃２）と前回の気筒判別結果とから、今回の
気筒判別結果を予測できることになる（図５参照）。次
のＳ２では、前回の基準信号ＲＥＦから今回の基準信号
ＲＥＦまでの間におけるＣＡＭ信号のカウント数を読み
込む。In the engine 1 according to the present embodiment, the ignition order is # 1 → # 3 → # 4 → # 2.
For example, when the # 3 cylinder was previously discriminated as a cylinder,
The four cylinders should be discriminated, and the ignition order (# 1 → #
3 → # 4 → # 2) and the previous cylinder discrimination result, the current cylinder discrimination result can be predicted (see FIG. 5). In the next S2, the count number of the CAM signal from the previous reference signal REF to the current reference signal REF is read.
【００２０】そして、Ｓ３では、前記ＣＡＭ信号のカウ
ント数から気筒判別を行う（気筒判別手段）。具体的に
は、カウント数が２であれば＃２気筒を判別し、カウン
ト数が３であれば＃３気筒を判別するものであり、カウ
ント数＝気筒ナンバーとして気筒判別を行う。Ｓ４で
は、前記Ｓ３でＣＡＭ信号のカウント数から判別した気
筒と、前記Ｓ１で前回の気筒判別結果から予測した気筒
とが一致するか否かを判断する（判別結果診断手段）。In S3, cylinder discrimination is performed from the count number of the CAM signal (cylinder discrimination means). Specifically, if the count number is 2, the # 2 cylinder is determined, and if the count number is 3, the # 3 cylinder is determined, and cylinder determination is performed with the count number = cylinder number. In S4, it is determined whether the cylinder determined from the count number of the CAM signal in S3 matches the cylinder predicted from the previous cylinder determination result in S1 (determination result diagnosis unit).
【００２１】そして、今回の判別結果（Ｓ３）と予測結
果（Ｓ１）とが一致する場合には、Ｓ３における今回の
判別結果が正しいものと判断し、Ｓ５へ進んで、今回の
気筒判別結果を用いた気筒別の噴射及び／又は点火制御
を行う。また、Ｓ６では、今回のＣＡＭ信号のカウント
数に基づく気筒判別の結果を前回値にセットし、次の基
準信号ＲＥＦ発生時には、前記前回値に基づき今回値が
予測されるようにする。If the current discrimination result (S3) matches the prediction result (S1), it is determined that the current discrimination result in S3 is correct, and the routine proceeds to S5, where the current cylinder discrimination result is determined. Injection and / or ignition control is performed for each used cylinder. In S6, the result of the cylinder discrimination based on the current CAM signal count is set to the previous value, and when the next reference signal REF is generated, the current value is predicted based on the previous value.
【００２２】一方、今回の判別結果（Ｓ３）と予測結果
（Ｓ１）とが一致しない場合には、ＣＡＭ信号にノイズ
が重畳するなどして、カウント値に誤りが生じたものと
判断する。そして、この場合には、Ｓ７で、今回の予測
結果を前回値にセットし、次の基準信号ＲＥＦ発生時に
は、前記前回値（前回の予測結果）に基づき今回値が予
測されるようにする。On the other hand, if the current discrimination result (S3) does not match the prediction result (S1), it is determined that an error has occurred in the count value due to noise superimposition on the CAM signal. In this case, in S7, the current prediction result is set to the previous value, and when the next reference signal REF occurs, the current value is predicted based on the previous value (previous prediction result).
【００２３】そして、Ｓ５，６を迂回してＳ８へ進むこ
とで、今回の気筒判別結果を用いた噴射及び／又は点火
制御を停止する（エンジン制御停止手段）。即ち、今回
の気筒判別結果に基づき燃料噴射を行うべき気筒に対す
る燃料噴射を停止し、また、点火を停止する。これによ
り少なくとも誤った気筒に対して燃料噴射が行われ、ま
た、点火が行われることを回避できる。Then, by bypassing S5 and S6 and proceeding to S8, the injection and / or ignition control using the current cylinder discrimination result is stopped (engine control stopping means). That is, based on the result of the current cylinder discrimination, fuel injection to the cylinder in which fuel injection is to be performed is stopped, and ignition is stopped. As a result, it is possible to prevent at least the fuel injection from being performed on the wrong cylinder and the ignition from being performed.
【００２４】また、気筒判別が行われる毎に、その結果
が正しいか誤っているかを判断でき、ノイズの重畳など
の断続的な異常も診断可能である。Ｓ８では、ＣＡＭ信
号のカウント数をリセットし、本ルーチンを終了する。
図６のフローチャートは、気筒判別制御の第２の実施形
態を示すものであり、Ｓ11〜Ｓ13では、前記Ｓ１〜Ｓ３
と同様に、前回の判別結果から今回の気筒判別結果を予
測すると共に（気筒判別結果予測手段）、ＣＡＭ信号の
カウント数から気筒判別を行う（気筒判別手段）。Further, each time the cylinder discrimination is performed, it can be determined whether the result is correct or incorrect, and it is possible to diagnose intermittent abnormalities such as superposition of noise. In S8, the count number of the CAM signal is reset, and this routine ends.
The flowchart of FIG. 6 shows a second embodiment of the cylinder discrimination control. In S11 to S13, the above S1 to S3
Similarly to the above, the present cylinder discrimination result is predicted from the previous discrimination result (cylinder discrimination result prediction means), and cylinder discrimination is performed from the count number of the CAM signal (cylinder discrimination means).
【００２５】そして、Ｓ14では、予測結果と実際の判別
結果とが一致しているか否かを判断する（判別結果診断
手段）。予測結果と実際の判別結果とが一致していれ
ば、今回のＣＡＭ信号のカウント数に基づく気筒判別結
果が正しいものと判断し、Ｓ16ヘ進んで、今回の気筒判
別結果を用いた気筒別の噴射及び／又は点火制御を行
う。Then, in S14, it is determined whether or not the predicted result matches the actual determination result (determination result diagnosis means). If the predicted result and the actual discrimination result match, it is determined that the cylinder discrimination result based on the current CAM signal count is correct, and the process proceeds to S16, where the cylinder-specific result using the current cylinder discrimination result is used. Injection and / or ignition control is performed.
【００２６】一方、Ｓ14で、予測結果と実際の判別結果
とが一致しないと判断されたときには、ＣＡＭ信号にノ
イズが重畳するなどしてカウント値に誤りが生じたもの
と判断し、Ｓ15へ進んで、前回の気筒判別結果に基づき
Ｓ11で予測した結果を、今回の気筒判別結果とする処理
を行って、Ｓ16へ進む。これにより、Ｓ16では、前回の
気筒判別結果に基づいて予測した気筒に基づいて、気筒
別の噴射及び／又は点火制御を行うことになる（エンジ
ン制御切り換え手段）。On the other hand, if it is determined in S14 that the prediction result does not match the actual determination result, it is determined that an error has occurred in the count value due to noise superimposition on the CAM signal, and the flow proceeds to S15. Then, the result predicted in S11 based on the previous cylinder determination result is set as the current cylinder determination result, and the process proceeds to S16. Thus, in S16, injection and / or ignition control for each cylinder is performed based on the cylinder predicted based on the previous cylinder determination result (engine control switching means).
【００２７】従って、ノイズの重畳によってＣＡＭ信号
から正しく気筒判別を行えない場合であっても、正常時
と同様に正しい気筒判別結果を設定して、気筒別の噴射
及び／又は点火制御を継続的に行えることになる。Ｓ17
では、ＣＡＭ信号のカウント数をリセットし、また、Ｓ
18では、今回の気筒判別結果を前回値にセットする。即
ち、ＣＡＭ信号のカウント数に基づく気筒判別に誤りが
あった場合には、前回の判別結果から予測した結果を今
回値とし、更に、前回値にセットすることになる。Therefore, even when the cylinder discrimination cannot be performed correctly from the CAM signal due to the superposition of noise, the correct cylinder discrimination result is set as in the normal case, and the injection and / or ignition control for each cylinder is continuously performed. Can be done. S17
Then, the count number of the CAM signal is reset, and S
At 18, the current cylinder discrimination result is set to the previous value. That is, if there is an error in the cylinder discrimination based on the count number of the CAM signal, the result predicted from the previous discrimination result is set as the current value and further set to the previous value.
【００２８】尚、上記実施の形態では、基準信号ＲＥＦ
間に出力される気筒判別信号ＣＡＭのパルス数によって
気筒判別を行わせる構成としたが、この他、気筒判別を
パルス幅によって行わせる構成などであっても良く、気
筒判別信号の種類を限定するものではない。また、基準
信号ＲＥＦが気筒判別信号ＣＡＭを兼ねる構成であって
も良い。In the above embodiment, the reference signal REF
Although the cylinder discrimination is performed based on the number of pulses of the cylinder discrimination signal CAM output in between, the cylinder discrimination may be performed based on the pulse width. Alternatively, the type of the cylinder discrimination signal may be limited. Not something. Further, the configuration may be such that the reference signal REF also serves as the cylinder determination signal CAM.
【図１】請求項２記載の発明の基本構成を示すブロック
図。FIG. 1 is a block diagram showing a basic configuration of the invention according to claim 2;
【図２】実施の形態のエンジンのシステム構成図。FIG. 2 is a system configuration diagram of the engine according to the embodiment;
【図３】実施形態における気筒判別信号の出力の様子を
示す図。FIG. 3 is a diagram showing a state of output of a cylinder discrimination signal in the embodiment.
【図４】気筒判別の第１の実施形態を示すフローチャー
ト。FIG. 4 is a flowchart illustrating a first embodiment of cylinder discrimination.
【図５】前記第１の実施形態の特性を示すタイムチャー
ト。FIG. 5 is a time chart showing characteristics of the first embodiment.
【図６】気筒判別の第２の実施形態を示すフローチャー
ト。FIG. 6 is a flowchart showing a second embodiment of cylinder discrimination.
１ エンジン ２ 燃料噴射弁 ３ 点火栓 ４ スロットル弁 ５ エアフローメータ ６ クランク角センサ ７ カムセンサ ８ コントロールユニット DESCRIPTION OF SYMBOLS 1 Engine 2 Fuel injection valve 3 Spark plug 4 Throttle valve 5 Air flow meter 6 Crank angle sensor 7 Cam sensor 8 Control unit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 智彦 神奈川県横浜市神奈川区宝町２番地 日産 自動車株式会社内 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tomohiko Takahashi Nissan Motor Co., Ltd. 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa
Claims (4)
毎に気筒判別を行うエンジンの気筒判別装置において、 前記気筒判別信号に基づく前回の気筒判別結果から今回
の気筒判別結果を予測し、該予測した気筒判別結果と前
記気筒判別信号に基づく判別結果とが異なるときに、前
記気筒判別信号に基づく判別結果の異常を診断するよう
構成したことを特徴とするエンジンの気筒判別装置。A cylinder discriminating device for an engine that performs cylinder discrimination for each stroke phase difference between cylinders based on a cylinder discrimination signal, predicting a current cylinder discrimination result from a previous cylinder discrimination result based on the cylinder discrimination signal, An engine cylinder discriminating device configured to diagnose an abnormality in a discrimination result based on the cylinder discrimination signal when the predicted cylinder discrimination result is different from a discrimination result based on the cylinder discrimination signal.
力する気筒判別信号出力手段と、 該気筒判別信号出力手段から出力される気筒判別信号に
基づいて前記行程位相差毎に気筒判別を行う気筒判別手
段と、 前記気筒判別手段による前回の判別結果から今回の気筒
判別結果を予測する気筒判別結果予測手段と、 該気筒判別結果予測手段で予測された気筒判別結果と、
前記気筒判別手段による気筒判別結果とを比較し、両者
が異なるときに前記気筒判別手段の異常を診断する判別
結果診断手段と、 を含んで構成されたことを特徴とするエンジンの気筒判
別装置。2. A cylinder discrimination signal output means for outputting a cylinder discrimination signal for each stroke phase difference between cylinders, and a cylinder discrimination for each stroke phase difference based on a cylinder discrimination signal output from the cylinder discrimination signal output means. Cylinder discrimination means for performing, cylinder discrimination result prediction means for predicting the current cylinder discrimination result from the previous discrimination result by the cylinder discrimination means, cylinder discrimination result predicted by the cylinder discrimination result prediction means,
A cylinder discriminating device for an engine, comprising: a discriminating result diagnosing unit that compares a cylinder discriminating result of the cylinder discriminating unit and diagnoses an abnormality of the cylinder discriminating unit when the two are different from each other.
手段の異常が診断されたときに、前記気筒判別手段によ
る判別結果を用いたエンジン制御を停止させるエンジン
制御停止手段を設けたことを特徴とする請求項２記載の
エンジンの気筒判別装置。3. An engine control stopping means for stopping engine control using the discrimination result by said cylinder discriminating means when said discrimination result diagnosing means diagnoses abnormality of said cylinder discriminating means. The cylinder discriminating device for an engine according to claim 2.
手段の異常が診断されたときに、前記気筒判別手段によ
る判別結果を用いたエンジン制御に代えて、前記気筒判
別結果予測手段による予測結果に基づいたエンジン制御
を行わせるエンジン制御切り換え手段を設けたことを特
徴とする請求項２記載のエンジンの気筒判別装置。4. When an abnormality of said cylinder discriminating means is diagnosed by said discriminating result diagnosing means, instead of engine control using said discriminating result by said cylinder discriminating means, a prediction result by said cylinder discriminating result predicting means is used. 3. The engine cylinder discriminating apparatus according to claim 2, further comprising engine control switching means for performing engine control based on the engine control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10152604A JPH11343919A (en) | 1998-06-02 | 1998-06-02 | Cylinder discriminating device of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10152604A JPH11343919A (en) | 1998-06-02 | 1998-06-02 | Cylinder discriminating device of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11343919A true JPH11343919A (en) | 1999-12-14 |
Family
ID=15544044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10152604A Pending JPH11343919A (en) | 1998-06-02 | 1998-06-02 | Cylinder discriminating device of engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11343919A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2021095606A1 (en) * | 2019-11-13 | 2021-05-20 | ||
| JP2022123253A (en) * | 2021-02-12 | 2022-08-24 | 三菱電機株式会社 | Controller of outboard motor |
-
1998
- 1998-06-02 JP JP10152604A patent/JPH11343919A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2021095606A1 (en) * | 2019-11-13 | 2021-05-20 | ||
| WO2021095606A1 (en) * | 2019-11-13 | 2021-05-20 | 日立Astemo株式会社 | Engine control device and engine control method |
| EP4060177A4 (en) * | 2019-11-13 | 2023-12-06 | Hitachi Astemo, Ltd. | Engine control device and engine control method |
| US11946425B2 (en) | 2019-11-13 | 2024-04-02 | Hitachi Astemo, Ltd. | Engine control device and engine control method |
| JP2022123253A (en) * | 2021-02-12 | 2022-08-24 | 三菱電機株式会社 | Controller of outboard motor |
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