JP7347392B2 - 内燃機関の失火判定装置 - Google Patents
内燃機関の失火判定装置 Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
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- F02D41/1497—With detection of the mechanical response of the engine
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- F02D41/1497—With detection of the mechanical response of the engine
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- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
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- B60W20/00—Control systems specially adapted for hybrid vehicles
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
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- G—PHYSICS
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- G01M15/00—Testing of engines
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- B60W2710/00—Output or target parameters relating to a particular sub-units
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/08—Electric propulsion units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
- F02D2200/1004—Estimation of the output torque
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- F02D2200/1015—Engines misfires
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Description
ここで、膨張行程の後半では、燃焼トルクは小さくなる一方、圧縮トルクは大きくなるため、上記出力軸トルクは負になる。この出力軸トルクが負になるクランク角の範囲が失火判定期間に含まれていると、算出される上記平均値の値が小さくなる。特に、出力軸トルクが小さい運転状態では、出力軸トルクが大きい運転状態と比べて上記平均値の値が小さくなるため、当該平均値が失火判定用の閾値未満になる可能性が高い。
機関負荷が小さくなると、膨張行程の気筒で生じる正のトルクである燃焼トルクが小さくなるため、この燃焼トルクが、圧縮行程の気筒で生じる負のトルクである圧縮トルクを下回るタイミングが早くなる。この点、同構成では、そうしたタイミングの変化に合わせて正トルク範囲の終点が設定されるため、そうした正トルク範囲内の期間として設定される失火判定期間も適切に設定することができる。
内燃機関の点火時期が早くなると、膨張行程の気筒で生じる正のトルクである燃焼トルクが、圧縮行程の気筒で生じる負のトルクである圧縮トルクを下回るタイミングが早くなる。この点、同構成では、そうしたタイミングの変化に合わせて正トルク範囲の終点が設定されるため、そうした正トルク範囲内の期間として設定される失火判定期間も適切に設定することができる。
図1に示すように、車両500に搭載された内燃機関10は、4つの気筒#1~#4を備える。内燃機関10の吸気通路12には、スロットルバルブ14が設けられている。吸気通路12の下流部分である吸気ポート12aには、吸気ポート12aに燃料を噴射するポート噴射弁16が設けられている。吸気通路12に吸入された空気やポート噴射弁16から噴射された燃料は、吸気バルブ18の開弁に伴って、燃焼室20に流入する。燃焼室20には、筒内噴射弁22から燃料が噴射される。また、燃焼室20内の空気と燃料との混合気は、点火プラグ24の火花放電に伴って燃焼に供される。そのときに生成される燃焼エネルギは、出力軸26の回転エネルギに変換される。
以下、失火判定について説明する。
すなわち、機関負荷率KLが小さいときには、膨張行程の気筒で生じる燃焼トルクが小さくなるため、この燃焼トルクが圧縮トルクを下回るタイミングが早くなる。つまり、機関負荷率KLが小さいときほど正トルク範囲Rの終点Reは早い時期になる。
また、点火時期AFINについても同様に、同点火時期AFINが早くなって進角側の時期になるほど、燃焼トルクが圧縮トルクを下回るタイミングは早くなる。つまり、点火時期AFINが早いときほど正トルク範囲Rの終点Reは早い時期になる。
図4に、上述した失火判定を実施するために制御装置70が実行する処理の手順を示す。図4に示す処理は、ROM74に記憶されたプログラムをCPU72が実行することにより実現される。なお、以下では、先頭に「S」が付与された数字によって各処理のステップ番号を表現する。
ここで、IEは内燃機関10の慣性モーメント、dωEは出力軸26の角速度ωEを微分した角加速度、ρは遊星歯車機構50のギア比、IGは第1モータジェネレータ52の慣性モーメント、dωGは第1モータジェネレータ52のロータの角速度ωGを微分した角加速度、TGは第1モータジェネレータ52のトルク反力である。
一方、トルク平均値TEAが閾値TEAref未満であると判定する場合には(S120:YES)、CPU72は、失火が発生したと判定して(S130)、今回の本処理を終了する。
(1)失火が生じていない正常燃焼時に出力軸26のトルクが0以上のトルクとなるクランク角の範囲内に失火判定期間HPの全期間が設定される。つまり、正常燃焼時において出力軸26のトルクが負となるクランク角の範囲が失火判定期間HPからは除かれるため、出力軸26のトルクが小さい運転状態においてトルク平均値TEAが小さくなることが抑えられる。従って、正常に燃焼しているにもかかわらず失火が発生したと誤判定されることを抑えることができる。
・正トルク範囲Rの起点Rsを失火判定期間HPの開始時期HPsとし、正トルク範囲Rの終点Reを失火判定期間HPの終了時期HPeとして設定することにより、正トルク範囲Rと失火判定期間HPとを一致させるようにした。この他、開始時期HPsを起点Rsよりも遅い時期にしたり、終了時期HPeを終点Reよりも早い時期にしたりすることにより、正トルク範囲R内の一部の期間を失火判定期間HPの全期間として設定するようにしてもよい。
・制御装置70としては、CPU72とROM74とを備えて、ソフトウェア処理を実行するものに限らない。たとえば、上記実施形態においてソフトウェア処理されたものの少なくとも一部を、ハードウェア処理するたとえばASIC等の専用のハードウェア回路を備えてもよい。すなわち、制御装置は、以下の(a)~(c)のいずれかの構成であればよい。(a)上記処理の全てを、プログラムに従って実行する処理装置と、プログラムを記憶するROM等のプログラム格納装置とを備える。(b)上記処理の一部をプログラムに従って実行する処理装置およびプログラム格納装置と、残りの処理を実行する専用のハードウェア回路とを備える。(c)上記処理の全てを実行する専用のハードウェア回路を備える。ここで、処理装置およびプログラム格納装置を備えたソフトウェア実行装置や、専用のハードウェア回路は複数であってもよい。
・内燃機関がポート噴射弁16および筒内噴射弁22を備えることは必須ではない。
26…出力軸
70…制御装置
Claims (3)
- 所定のクランク角の範囲が失火判定期間として設定されており、その失火判定期間内における内燃機関の出力軸トルクの平均値を算出する算出処理と、
算出した前記平均値が規定の閾値未満である場合に失火が生じたと判定する失火判定処理と、
前記失火判定期間の全期間を、失火が生じていない正常燃焼時に前記出力軸トルクが0以上のトルクとなるクランク角の範囲である正トルク範囲内の期間に設定する処理と、を実行し、
機関負荷が小さいときほど前記正トルク範囲の終点を早い時期に設定する処理を実行する
内燃機関の失火判定装置。 - 所定のクランク角の範囲が失火判定期間として設定されており、その失火判定期間内における内燃機関の出力軸トルクの平均値を算出する算出処理と、
算出した前記平均値が規定の閾値未満である場合に失火が生じたと判定する失火判定処理と、
前記失火判定期間の全期間を、失火が生じていない正常燃焼時に前記出力軸トルクが0以上のトルクとなるクランク角の範囲である正トルク範囲内の期間に設定する処理と、を実行し、
前記内燃機関の点火時期が早いときほど前記正トルク範囲の終点を早い時期に設定する処理を実行する
内燃機関の失火判定装置。 - 前記正トルク範囲の起点は、圧縮上死点から規定の範囲内におけるクランク角であって前記出力軸トルクが負のトルクから0以上のトルクに変わるタイミングのクランク角である
請求項1又は2に記載の内燃機関の失火判定装置。
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