JP2009185740A - Abnormality diagnosing device of internal combustion engine - Google Patents

Abnormality diagnosing device of internal combustion engine Download PDF

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JP2009185740A
JP2009185740A JP2008027991A JP2008027991A JP2009185740A JP 2009185740 A JP2009185740 A JP 2009185740A JP 2008027991 A JP2008027991 A JP 2008027991A JP 2008027991 A JP2008027991 A JP 2008027991A JP 2009185740 A JP2009185740 A JP 2009185740A
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fuel injection
cylinder
fuel
injection valve
abnormal
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JP4868173B2 (en
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Toshihiko Tanaka
敏彦 田中
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Denso Corp
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Denso Corp
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Priority to US12/354,161 priority patent/US7933710B2/en
Priority to DE102009000269.3A priority patent/DE102009000269B4/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/22Safety or indicating devices for abnormal conditions
    • F02D41/221Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/3094Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1497With detection of the mechanical response of the engine
    • F02D41/1498With detection of the mechanical response of the engine measuring engine roughness

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To allow an internal combustion engine provided with two fuel injection valves for each cylinder to identify the fuel injection valve with an abnormality when one of the fuel injection valves has an abnormality. <P>SOLUTION: The internal combustion engine includes two fuel injection valves 21 (A and B) for each cylinder. When diagnosing the abnormality of the fuel injection valves 21, the existence of a torque variation (or variation in combustion state) is determined by selectively causing the injection of the two fuel injection valves 21 of each cylinder. Based on the determination result, the fuel injection valve 21 with the abnormality is identified from the two fuel injection valves 21 of each cylinder. The injection operation of the fuel injection valves 21 at the same position as positions of the fuel injection valves 21 identified as abnormal is inhibited for all the cylinders, and injection amounts of the remaining fuel injection valves 21 are increasingly corrected so that only the remaining fuel injection valves 21 inject fuel amounts corresponding to a required fuel injection amount. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、内燃機関の各気筒毎にそれぞれ複数の燃料噴射弁を設けた内燃機関の異常診断装置に関する発明である。   The present invention relates to an abnormality diagnosis device for an internal combustion engine in which a plurality of fuel injection valves are provided for each cylinder of the internal combustion engine.

特許文献1(特開昭63−94057号公報)に記載されているように、内燃機関の各気筒内での燃料噴霧の微粒化やポートウエット低減(吸気ポート内壁面への燃料付着低減)等を目的として、内燃機関の各気筒の2つの吸気ポートにそれぞれ燃料噴射弁を配置して、各気筒毎にそれぞれ2つの燃料噴射弁で燃料を噴射するようにしたものがある。   As described in Patent Document 1 (Japanese Patent Laid-Open No. 63-94057), atomization of fuel spray in each cylinder of an internal combustion engine, port wet reduction (reduction of fuel adhesion to the inner wall surface of the intake port), etc. For this purpose, a fuel injection valve is arranged in each of two intake ports of each cylinder of the internal combustion engine, and fuel is injected by two fuel injection valves for each cylinder.

また、特許文献2(特開2007−85176号公報)に記載されているように、内燃機関の各気筒の排出ガスが集合して流れる排気合流部に配置された空燃比センサの出力に基づいて各気筒の空燃比の異常(燃料噴射弁の異常)の有無を判定するようにしたものがある。
特開昭63−94057号公報(第3頁、図1等参照) 特開2007−85176号公報(第2頁等参照)
Further, as described in Patent Document 2 (Japanese Patent Application Laid-Open No. 2007-85176), based on the output of an air-fuel ratio sensor disposed in an exhaust merging portion where exhaust gases of each cylinder of an internal combustion engine gather and flow. Some cylinders determine whether or not there is an abnormality in the air-fuel ratio of each cylinder (abnormality of the fuel injection valve).
Japanese Unexamined Patent Publication No. 63-94057 (see page 3, FIG. 1 etc.) JP 2007-85176 A (see page 2 etc.)

ところで、特許文献1に記載された各気筒毎にそれぞれ2つの燃料噴射弁を設けた内燃機関に、特許文献2に記載の異常診断技術を組み合わせると、各気筒の2つの燃料噴射弁のいずれかが異常になった場合、燃料噴射弁の異常により空燃比が異常になった気筒を特定することは可能であるが、その異常気筒の2つの燃料噴射弁のうちいずれの燃料噴射弁が異常であるかを特定することはできない。このため、サービス工場等では、異常気筒の2つの燃料噴射弁を両方とも交換する必要があり、交換作業に手間が掛かると共に交換部品のコストが高くなるという問題がある。   By the way, when the abnormality diagnosis technique described in Patent Document 2 is combined with an internal combustion engine provided with two fuel injection valves for each cylinder described in Patent Document 1, one of the two fuel injection valves for each cylinder is combined. Is abnormal, it is possible to identify the cylinder whose air-fuel ratio has become abnormal due to the abnormality of the fuel injection valve, but which of the two fuel injection valves of the abnormal cylinder is abnormal. It is not possible to specify whether it exists. For this reason, in a service factory or the like, it is necessary to replace both of the two fuel injection valves of the abnormal cylinder, and there is a problem that the replacement work takes time and the cost of replacement parts increases.

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、従って本発明の目的は、各気筒毎にそれぞれ複数の燃料噴射弁を設けた内燃機関において、いずれかの燃料噴射弁の異常が発生した場合に、その異常な燃料噴射弁を特定することができる内燃機関の異常診断装置を提供することにある。   The present invention has been made in consideration of such circumstances. Accordingly, an object of the present invention is to provide an abnormality of any fuel injection valve in an internal combustion engine provided with a plurality of fuel injection valves for each cylinder. An object of the present invention is to provide an abnormality diagnosis device for an internal combustion engine that can identify an abnormal fuel injection valve when the occurrence of this occurs.

上記目的を達成するために、請求項1に係る発明は、内燃機関の各気筒毎にそれぞれ複数の燃料噴射弁を設けた内燃機関の異常診断装置において、異常診断手段により前記燃料噴射弁の異常診断を行う際に、各気筒の前記複数の燃料噴射弁を1つずつ切り替えて噴射させてトルク変動又は燃焼状態の変動の有無を判定し、その判定結果に基づいて前記複数の燃料噴射弁の中から異常な燃料噴射弁を特定するようにしたものである。   In order to achieve the above object, according to a first aspect of the present invention, there is provided an abnormality diagnosis device for an internal combustion engine in which a plurality of fuel injection valves are provided for each cylinder of the internal combustion engine. When making a diagnosis, the plurality of fuel injection valves of each cylinder are switched and injected one by one to determine the presence or absence of torque fluctuation or combustion state fluctuation, and based on the determination result, the plurality of fuel injection valves. An abnormal fuel injection valve is identified from the inside.

このように、各気筒の複数の燃料噴射弁を1つずつ切り替えて噴射させると、異常な燃料噴射弁からは燃料が正常に噴射されないため、異常な燃料噴射弁を噴射動作させたときに、内燃機関のトルクや燃焼状態が変動する。この関係から、各気筒の複数の燃料噴射弁を1つずつ切り替えて噴射させたときのトルク変動や燃焼状態の変動の有無を判定すれば、トルク変動や燃焼状態の変動が発生する直前の噴射時期の燃料噴射弁が異常であると特定することができる。   In this way, when the fuel injection valves of each cylinder are switched and injected one by one, the fuel is not normally injected from the abnormal fuel injection valve, so when the abnormal fuel injection valve is operated for injection, The torque and combustion state of the internal combustion engine vary. From this relationship, if it is determined whether or not there are torque fluctuations and combustion state fluctuations when a plurality of fuel injection valves of each cylinder are switched one by one, the injection immediately before the torque fluctuations and combustion state fluctuations occur It can be determined that the fuel injection valve at the time is abnormal.

この場合、請求項2のように、異常と特定された燃料噴射弁の噴射動作を禁止して残りの燃料噴射弁のみで要求噴射量相当分の燃料量を噴射するように当該残りの燃料噴射弁の噴射量を増量補正するフェールセーフ手段を備えた構成とすると良い。このようにすれば、各気筒の複数の燃料噴射弁のいずれかが異常になった場合でも、残りの燃料噴射弁のみで要求噴射量相当分の燃料量を噴射して空燃比を目標空燃比に制御することが可能となり、ドライバビリティやエミッションの悪化を抑えながら内燃機関の運転を継続することができる。   In this case, as in claim 2, the remaining fuel injection is performed so that the fuel injection valve identified as abnormal is prohibited from being injected and the fuel amount corresponding to the required injection amount is injected only by the remaining fuel injection valve. It is preferable to employ a configuration provided with fail-safe means for correcting the injection amount of the valve to increase. In this way, even when any of the plurality of fuel injection valves of each cylinder becomes abnormal, the fuel quantity corresponding to the required injection quantity is injected only with the remaining fuel injection valves, and the air-fuel ratio is set to the target air-fuel ratio. Therefore, it is possible to continue the operation of the internal combustion engine while suppressing deterioration of drivability and emission.

更に、請求項3のように、いずれかの気筒で異常な燃料噴射弁を検出したときに、当該異常な燃料噴射弁の位置と同じ位置の燃料噴射弁の噴射動作を全気筒禁止して、残りの燃料噴射弁のみで燃料を増量補正して噴射するようにしても良い。このようにすれば、各気筒の複数の燃料噴射弁のいずれかが異常になったときに、全ての気筒で同じ位置の燃料噴射弁から燃料を噴射することができるため、異常な燃料噴射弁を持つ気筒の燃料噴霧形状(混合気の形成状態)が他の気筒と異なることを防止できて、全ての気筒の燃料噴霧形状を同一にすることができ、内燃機関の気筒間の燃料噴霧形状の違いによるトルク変動等を抑えることができる。   Further, as in claim 3, when an abnormal fuel injection valve is detected in any of the cylinders, all cylinders are prohibited from injecting the fuel injection valve at the same position as the abnormal fuel injection valve. It is also possible to inject the fuel by increasing the amount of fuel using only the remaining fuel injection valves. In this way, when any one of the plurality of fuel injection valves in each cylinder becomes abnormal, fuel can be injected from the fuel injection valve at the same position in all the cylinders. It is possible to prevent the fuel spray shape of the cylinder having the mixture (formation state of the air-fuel mixture) from being different from that of the other cylinders, to make the fuel spray shape of all the cylinders the same, and the fuel spray shape between the cylinders of the internal combustion engine Torque fluctuations due to the difference can be suppressed.

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に基づいてエンジン制御システム全体の概略構成を説明する。
内燃機関であるエンジン11の吸気管12の最上流部には、エアクリーナ13が設けられ、このエアクリーナ13の下流側に、吸入空気量を検出するエアフローメータ14が設けられている。このエアフローメータ14の下流側には、モータ15によって開度調節されるスロットルバルブ16と、このスロットルバルブ16の開度(スロットル開度)を検出するスロットル開度センサ17とが設けられている。
Hereinafter, an embodiment embodying the best mode for carrying out the present invention will be described.
First, a schematic configuration of the entire engine control system will be described with reference to FIG.
An air cleaner 13 is provided at the most upstream portion of the intake pipe 12 of the engine 11 that is an internal combustion engine, and an air flow meter 14 that detects the intake air amount is provided downstream of the air cleaner 13. A throttle valve 16 whose opening is adjusted by a motor 15 and a throttle opening sensor 17 that detects the opening (throttle opening) of the throttle valve 16 are provided on the downstream side of the air flow meter 14.

更に、スロットルバルブ16の下流側には、サージタンク18が設けられ、このサージタンク18に、吸気管圧力を検出する吸気管圧力センサ19が設けられている。また、サージタンク18には、エンジン11の各気筒に空気を導入する吸気マニホールド20が設けられ、各気筒の吸気マニホールド20に接続された吸気ポート31又はその近傍に、それぞれ燃料を噴射する燃料噴射弁21が取り付けられている。また、エンジン11のシリンダヘッドには、各気筒毎に点火プラグ22が取り付けられ、各点火プラグ22の火花放電によって筒内の混合気に着火される。   Further, a surge tank 18 is provided on the downstream side of the throttle valve 16, and an intake pipe pressure sensor 19 for detecting the intake pipe pressure is provided in the surge tank 18. The surge tank 18 is provided with an intake manifold 20 that introduces air into each cylinder of the engine 11, and a fuel injection that injects fuel into or near the intake port 31 connected to the intake manifold 20 of each cylinder. A valve 21 is attached. An ignition plug 22 is attached to the cylinder head of the engine 11 for each cylinder, and the air-fuel mixture in the cylinder is ignited by spark discharge of each ignition plug 22.

図2に示すように、エンジン11の各気筒には、それぞれ2つの吸気ポート31と2つの排気ポート32が設けられ、各気筒の2つの吸気ポート31又はその近傍に、それぞれ燃料噴射弁21が配置されている。各吸気ポート31は、それぞれ吸気バルブ33によって開閉され、各排気ポート32は、それぞれ排気バルブ34によって開閉される。燃料タンク35内に貯溜された燃料は、燃料ポンプ36によって汲み上げられ、この燃料ポンプ36から吐出される燃料が燃料供給配管37を通して各気筒の燃料噴射弁21に供給される。   As shown in FIG. 2, each cylinder of the engine 11 is provided with two intake ports 31 and two exhaust ports 32, and a fuel injection valve 21 is provided at or near the two intake ports 31 of each cylinder. Has been placed. Each intake port 31 is opened and closed by an intake valve 33, and each exhaust port 32 is opened and closed by an exhaust valve 34. The fuel stored in the fuel tank 35 is pumped up by the fuel pump 36, and the fuel discharged from the fuel pump 36 is supplied to the fuel injection valves 21 of the respective cylinders through the fuel supply pipe 37.

一方、図1に示すように、エンジン11の排気管23(排気通路)には、排出ガスの空燃比又はリッチ/リーン等を検出する排出ガスセンサ24(空燃比センサ、酸素センサ等)が設けられ、この排出ガスセンサ24の下流側に、排出ガスを浄化する三元触媒等の触媒25が設けられている。   On the other hand, as shown in FIG. 1, the exhaust pipe 23 (exhaust passage) of the engine 11 is provided with an exhaust gas sensor 24 (air-fuel ratio sensor, oxygen sensor, etc.) for detecting the air-fuel ratio or rich / lean of the exhaust gas. A catalyst 25 such as a three-way catalyst for purifying exhaust gas is provided downstream of the exhaust gas sensor 24.

また、エンジン11のシリンダブロックには、冷却水温を検出する冷却水温センサ26や、ノッキング振動を検出するノックセンサ29が取り付けられている。また、クランク軸27の外周側には、クランク軸27が所定クランク角回転する毎にパルス信号を出力するクランク角センサ28が取り付けられ、このクランク角センサ28の出力信号に基づいてクランク角やエンジン回転速度が検出される。   A cooling water temperature sensor 26 that detects the cooling water temperature and a knock sensor 29 that detects knocking vibration are attached to the cylinder block of the engine 11. A crank angle sensor 28 that outputs a pulse signal every time the crankshaft 27 rotates by a predetermined crank angle is attached to the outer peripheral side of the crankshaft 27. Based on the output signal of the crank angle sensor 28, the crank angle and engine The rotation speed is detected.

これら各種センサの出力は、エンジン制御回路(以下「ECU」と表記する)30に入力される。このECU30は、マイクロコンピュータを主体として構成され、内蔵されたROM(記憶媒体)に記憶された各種のエンジン制御プログラムを実行することで、エンジン運転状態に応じて燃料噴射弁21の燃料噴射量や点火プラグ22の点火時期を制御する。通常、各気筒に配置された2つの燃料噴射弁21は、燃料噴射量が同一(燃料噴射量の比率が50:50)になるように制御される。   Outputs of these various sensors are input to an engine control circuit (hereinafter referred to as “ECU”) 30. The ECU 30 is mainly composed of a microcomputer, and executes various engine control programs stored in a built-in ROM (storage medium) so that the fuel injection amount of the fuel injection valve 21 can be determined according to the engine operating state. The ignition timing of the spark plug 22 is controlled. Usually, the two fuel injection valves 21 arranged in each cylinder are controlled so that the fuel injection amount is the same (the ratio of the fuel injection amount is 50:50).

また、ECU30は、後述する図3の燃料噴射弁異常診断ルーチンを実行することで、燃料噴射弁21の異常診断を行う際に、各気筒の2つの燃料噴射弁21を片方ずつ切り替えて噴射させてトルク変動(又は燃焼状態の変動)の有無を判定し、その判定結果に基づいて2つの燃料噴射弁21の中から異常な燃料噴射弁21を特定する。以下、説明の便宜上、各気筒に配置した2つの燃料噴射弁21のうちの一方を「燃料噴射弁A」と表記し、他方を「燃料噴射弁B」と表記する。   Further, the ECU 30 executes a fuel injection valve abnormality diagnosis routine of FIG. 3 to be described later, so that when performing abnormality diagnosis of the fuel injection valve 21, the two fuel injection valves 21 of each cylinder are switched and injected one by one. Then, the presence or absence of torque fluctuation (or fluctuation of combustion state) is determined, and an abnormal fuel injection valve 21 is specified from the two fuel injection valves 21 based on the determination result. Hereinafter, for convenience of explanation, one of the two fuel injection valves 21 arranged in each cylinder is referred to as “fuel injection valve A”, and the other is referred to as “fuel injection valve B”.

図3の燃料噴射弁異常診断ルーチンは、エンジン運転中に所定周期で実行され、特許請求の範囲でいう異常診断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101で、異常診断実行条件が成立しているか否かを判定する。ここで、異常診断実行条件は、例えば、[1]アイドル運転中(又は定常運転中)であること、[2]エンジン11の暖機完了後であること、[3]燃料噴射弁A,Bを除くエンジン制御系に異常が検出されていないこと等であり、これらの条件を全て満たせば、異常診断実行条件が成立し、いずれか1つでも満たさない条件があれば、異常診断実行条件が不成立となる。   The fuel injection valve abnormality diagnosis routine of FIG. 3 is executed at a predetermined cycle during engine operation, and serves as abnormality diagnosis means in the claims. When this routine is started, first, in step 101, it is determined whether or not an abnormality diagnosis execution condition is satisfied. Here, the abnormality diagnosis execution conditions are, for example, [1] idle operation (or steady operation), [2] after the engine 11 has been warmed up, and [3] fuel injection valves A and B. No abnormality is detected in the engine control system except for the above. If all of these conditions are satisfied, the abnormality diagnosis execution condition is satisfied. If any one of the conditions is not satisfied, the abnormality diagnosis execution condition is Not established.

このステップ101で、異常診断実行条件が不成立であると判定されれば、以降の処理を行うことなく本ルーチンを終了し、異常診断実行条件が成立していると判定されれば、ステップ102に進み、全気筒の一方の燃料噴射弁Aの噴射を許可して、他方の燃料噴射弁Bの噴射を禁止し、全気筒の一方の燃料噴射弁Aの噴射を順番に実行する。   If it is determined in step 101 that the abnormality diagnosis execution condition is not satisfied, this routine is terminated without performing the subsequent processing. If it is determined that the abnormality diagnosis execution condition is satisfied, the process proceeds to step 102. Then, the injection of one fuel injection valve A of all cylinders is permitted, the injection of the other fuel injection valve B is prohibited, and the injection of one fuel injection valve A of all cylinders is executed in order.

この後、ステップ103に進み、トルク変動(又は燃焼状態の変動)が発生したか否かを判定する。この際、トルク変動(又は燃焼状態の変動)の判定方法は、例えば、エンジン回転速度の変動量、各気筒の筒内圧センサ(図示せず)で検出した筒内圧(燃焼圧)、排出ガスセンサ24で検出した排出ガスの空燃比のうちの少なくとも1つに基づいてトルク変動(又は燃焼状態の変動)を判定したり、或は、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22等を介して検出して、そのイオン電流に基づいて燃焼状態の変動を判定するようにしても良い。   Thereafter, the process proceeds to step 103, where it is determined whether or not torque fluctuation (or combustion state fluctuation) has occurred. At this time, the torque fluctuation (or combustion state fluctuation) determination method includes, for example, the fluctuation amount of the engine speed, the in-cylinder pressure (combustion pressure) detected by the in-cylinder pressure sensor (not shown) of each cylinder, and the exhaust gas sensor 24. Based on at least one of the air-fuel ratios of the exhaust gas detected in step 1, the torque fluctuation (or the combustion state fluctuation) is determined, or the ion current generated by the combustion of the air-fuel mixture is ignited. And the variation in the combustion state may be determined based on the ion current.

このステップ103で、トルク変動(又は燃焼状態の変動)が発生しなかったと判定されれば、ステップ104に進み、全気筒の一方の燃料噴射弁Aが正常であると判定する。これに対して、上記ステップ103で、トルク変動(又は燃焼状態の変動)が発生したと判定されれば、ステップ105に進み、トルク変動(又は燃焼状態の変動)が発生した気筒の一方の燃料噴射弁Aが異常であると特定する。   If it is determined in step 103 that torque fluctuation (or combustion state fluctuation) has not occurred, the routine proceeds to step 104 where it is determined that one fuel injection valve A of all cylinders is normal. On the other hand, if it is determined in step 103 that torque fluctuation (or combustion state fluctuation) has occurred, the routine proceeds to step 105, where one fuel of the cylinder in which torque fluctuation (or combustion state fluctuation) has occurred. It is specified that the injection valve A is abnormal.

この後、ステップ106に進み、全気筒の他方の燃料噴射弁Bの噴射を許可して、一方の燃料噴射弁Bの噴射を禁止し、全気筒の他方の燃料噴射弁Bの噴射を順番に実行する。   After this, the routine proceeds to step 106 where the injection of the other fuel injection valve B of all cylinders is permitted, the injection of one fuel injection valve B is prohibited, and the injection of the other fuel injection valve B of all cylinders is sequentially performed. Execute.

この後、ステップ107に進み、トルク変動(又は燃焼状態の変動)が発生したか否かを上記ステップ103と同様の方法で判定し、その結果、トルク変動(又は燃焼状態の変動)が発生しなかったと判定されれば、ステップ108に進み、全気筒の他方の燃料噴射弁Bが正常であると判定する。   Thereafter, the routine proceeds to step 107, where it is determined whether or not torque fluctuation (or combustion state fluctuation) has occurred by the same method as in step 103. As a result, torque fluctuation (or combustion state fluctuation) occurs. If it is determined that there is not, the routine proceeds to step 108, where it is determined that the other fuel injection valves B of all the cylinders are normal.

これに対して、上記ステップ107で、トルク変動(又は燃焼状態の変動)が発生したと判定されれば、ステップ109に進み、トルク変動(又は燃焼状態の変動)が発生した気筒の他方の燃料噴射弁Bが異常であると特定する。   On the other hand, if it is determined in step 107 that torque fluctuation (or combustion state fluctuation) has occurred, the process proceeds to step 109 and the other fuel in the cylinder in which torque fluctuation (or combustion state fluctuation) has occurred. It is specified that the injection valve B is abnormal.

この後、ステップ110に進み、全気筒の両方の燃料噴射弁A,Bが正常であるか否かを判定し、全気筒の両方の燃料噴射弁A,Bが正常であれば、ステップ111に進み、全気筒の両方の燃料噴射弁A,Bの噴射を許可して本ルーチンを終了する。   Thereafter, the routine proceeds to step 110, where it is determined whether or not the fuel injection valves A and B of all cylinders are normal. If both the fuel injection valves A and B of all cylinders are normal, the routine proceeds to step 111. The routine proceeds to allow the fuel injection valves A and B of all the cylinders to be injected, and the routine ends.

これに対して、上記ステップ110で、「No」と判定された場合、つまりいずれかの気筒の2つの燃料噴射弁A,Bのどちらかが異常の場合は、ステップ112に進み、異常な燃料噴射弁の位置と同じ位置の燃料噴射弁の噴射動作を全気筒禁止して、次のステップ113で、正常な燃料噴射弁(噴射が許可された燃料噴射弁)のみで要求噴射量相当分の燃料量を噴射するように正常な燃料噴射弁(噴射が許可された燃料噴射弁)の噴射量を異常な燃料噴射弁(噴射が禁止された燃料噴射弁)の噴射量相当分だけ増量補正する。これらのステップ112、113の処理が特許請求の範囲でいうフェールセーフ手段としての役割を果たす。   On the other hand, if it is determined as “No” in step 110, that is, if one of the two fuel injection valves A and B of any cylinder is abnormal, the process proceeds to step 112 and abnormal fuel is generated. All cylinders are prohibited from performing the injection operation of the fuel injection valve at the same position as the injection valve position, and in the next step 113, only the normal fuel injection valve (the fuel injection valve that is permitted to inject) is used. The injection amount of a normal fuel injection valve (a fuel injection valve for which injection is permitted) is increased and corrected by an amount corresponding to the injection amount of an abnormal fuel injection valve (a fuel injection valve for which injection is prohibited) so as to inject the fuel amount. . The processes in these steps 112 and 113 serve as fail-safe means in the claims.

以上説明した図3の燃料噴射弁異常診断ルーチンの実行例を図4のタイムチャートを用いて説明する。図4の例は、4気筒エンジンで、#4気筒の燃料噴射弁Bが異常になったときの挙動を示している。図4の例では、時刻t1 で、異常診断実行条件が成立して、燃料噴射弁異常診断が開始され、まず、全気筒の一方の燃料噴射弁Aの噴射を許可して、他方の燃料噴射弁Bの噴射を禁止し、全気筒の一方の燃料噴射弁Aの噴射を、例えば#1気筒→#3気筒→#4気筒→#2気筒の順序で実行する。   An execution example of the fuel injection valve abnormality diagnosis routine of FIG. 3 described above will be described with reference to the time chart of FIG. The example of FIG. 4 shows the behavior when the fuel injection valve B of the # 4 cylinder becomes abnormal in a 4-cylinder engine. In the example of FIG. 4, the abnormality diagnosis execution condition is satisfied at time t1, and the fuel injection valve abnormality diagnosis is started. First, the injection of one fuel injection valve A of all cylinders is permitted, and the other fuel injection is performed. The injection of the valve B is prohibited, and the injection of one fuel injection valve A of all cylinders is executed in the order of, for example, # 1 cylinder → # 3 cylinder → # 4 cylinder → # 2 cylinder.

全気筒の一方の燃料噴射弁Aの噴射を一巡した時点t2 で、全気筒の一方の燃料噴射弁Aの噴射を禁止して、他方の燃料噴射弁Bの噴射を許可し、全気筒の他方の燃料噴射弁Bの噴射を、例えば#1気筒→#3気筒→#4気筒→#2気筒の順序で実行する。   At the time t2 when the injection of one fuel injection valve A of all cylinders is completed, the injection of one fuel injection valve A of all cylinders is prohibited, the injection of the other fuel injection valve B is permitted, and the other of all cylinders The fuel injection valve B is injected in the order of, for example, # 1 cylinder → # 3 cylinder → # 4 cylinder → # 2 cylinder.

この燃料噴射弁異常診断を実行している期間に、トルク変動(又は燃焼状態の変動)が発生したか否かを監視する。そして、例えば、他方の燃料噴射弁Bの噴射を実行している期間に、トルク変動(又は燃焼状態の変動)が検出されれば、そのトルク変動(又は燃焼状態の変動)が発生した気筒(図4の例では#4気筒)の他方の燃料噴射弁Bが異常であると判定する。   It is monitored whether or not torque fluctuations (or fluctuations in the combustion state) have occurred during the period during which this fuel injection valve abnormality diagnosis is being executed. For example, if torque fluctuation (or fluctuation in combustion state) is detected during the period in which the injection of the other fuel injection valve B is being performed, the cylinder in which the torque fluctuation (or fluctuation in combustion state) has occurred ( In the example of FIG. 4, it is determined that the other fuel injection valve B of # 4 cylinder) is abnormal.

この場合は、燃料噴射弁異常診断を終了した時点t3 で、異常な燃料噴射弁Bの位置と同じ位置の燃料噴射弁Bの噴射動作を全気筒禁止して、一方の燃料噴射弁Aのみの噴射を許可すると共に、噴射を禁止する燃料噴射弁Bの噴射量相当分だけ正常な燃料噴射弁Aの噴射量を増量補正する。   In this case, at the time t3 when the fuel injection valve abnormality diagnosis is completed, all cylinders are prohibited from performing the injection operation of the fuel injection valve B at the same position as the abnormal fuel injection valve B. The injection amount of the normal fuel injection valve A is increased and corrected by an amount corresponding to the injection amount of the fuel injection valve B that permits the injection and prohibits the injection.

以上説明した本実施例によれば、燃料噴射弁21(A,B)の異常診断を行う際に、各気筒の2つの燃料噴射弁21を片方ずつ切り替えて噴射させてトルク変動(又は燃焼状態の変動)の有無を判定し、その判定結果に基づいて2つの燃料噴射弁21の中から異常な燃料噴射弁21を特定するようにしたので、いずれかの燃料噴射弁21の異常が発生した場合に、その異常な燃料噴射弁21を特定することができる。   According to the present embodiment described above, when an abnormality diagnosis of the fuel injection valve 21 (A, B) is performed, the two fuel injection valves 21 of each cylinder are switched and injected one by one to change the torque (or combustion state). And the abnormal fuel injection valve 21 is identified from the two fuel injection valves 21 based on the determination result, so that one of the fuel injection valves 21 is abnormal. In this case, the abnormal fuel injection valve 21 can be identified.

しかも、本実施例では、いずれかの燃料噴射弁21の異常が発生した場合に、異常と特定された燃料噴射弁21の噴射動作を禁止して残りの燃料噴射弁21のみで要求噴射量相当分の燃料量を噴射するように当該残りの燃料噴射弁21の噴射量を増量補正するようにしたので、各気筒の2つの燃料噴射弁21のどちらが異常になった場合でも、残りの燃料噴射弁21のみで要求噴射量相当分の燃料量を噴射して空燃比を目標空燃比に制御することが可能となり、ドライバビリティやエミッションの悪化を抑えながらエンジン11の運転を継続することができる利点もある。   In addition, in this embodiment, when any one of the fuel injection valves 21 is abnormal, the injection operation of the fuel injection valve 21 identified as abnormal is prohibited, and only the remaining fuel injection valves 21 correspond to the required injection amount. Since the injection amount of the remaining fuel injection valve 21 is corrected so as to inject the remaining fuel amount, the remaining fuel injection is performed regardless of which of the two fuel injection valves 21 of each cylinder becomes abnormal. It is possible to control the air-fuel ratio to the target air-fuel ratio by injecting a fuel amount corresponding to the required injection amount with only the valve 21 and to continue the operation of the engine 11 while suppressing deterioration of drivability and emission. There is also.

更に、本実施例では、いずれかの気筒で異常な燃料噴射弁21を検出したときに、当該異常な燃料噴射弁21の位置と同じ位置の燃料噴射弁21の噴射動作を全気筒禁止して、全ての気筒で同じ位置の燃料噴射弁から燃料を噴射するようにしているため、異常な燃料噴射弁21を持つ気筒の燃料噴霧形状(混合気の形成状態)が他の気筒と異なることを防止できて、全ての気筒の燃料噴霧形状を同一にすることができ、気筒間の燃料噴霧形状の違いによるトルク変動等を抑えることができる利点もある。   Furthermore, in this embodiment, when an abnormal fuel injection valve 21 is detected in any cylinder, the injection operation of the fuel injection valve 21 at the same position as the position of the abnormal fuel injection valve 21 is prohibited for all cylinders. Since all the cylinders inject fuel from the fuel injection valve at the same position, the fuel spray shape (mixture formation state) of the cylinder having the abnormal fuel injection valve 21 is different from the other cylinders. It is possible to prevent this, and the fuel spray shapes of all the cylinders can be made the same, and there is also an advantage that torque fluctuations due to differences in fuel spray shapes among the cylinders can be suppressed.

尚、本発明は、1気筒当り2つの燃料噴射弁を配置したシステムに限定されず、1気筒当り3つ以上の燃料噴射弁を配置したシステムにも適用して実施できる。   The present invention is not limited to a system in which two fuel injection valves are disposed per cylinder, and can be applied to a system in which three or more fuel injection valves are disposed per cylinder.

本発明の一実施例におけるエンジン制御システム全体の概略構成図である。It is a schematic block diagram of the whole engine control system in one Example of this invention. 1つの気筒に配置した2つの燃料噴射弁及びその周辺部の概略構成図である。It is a schematic block diagram of two fuel-injection valves arrange | positioned at one cylinder, and its periphery part. 燃料噴射弁異常診断ルーチンの処理の流れを説明するフローチャートである。It is a flowchart explaining the flow of a process of a fuel injection valve abnormality diagnosis routine. 燃料噴射弁異常診断を実行する時の制御例を示すタイムチャートである。It is a time chart which shows the example of control at the time of performing a fuel injection valve abnormality diagnosis.

符号の説明Explanation of symbols

11…エンジン(内燃機関)、12…吸気管、16…スロットルバルブ、21(A,B)…燃料噴射弁、22…点火プラグ、23…排気管、24…排出ガスセンサ、30…ECU(異常診断手段,フェールセーフ制御手段)、31…吸気ポート、32…排気ポート   DESCRIPTION OF SYMBOLS 11 ... Engine (internal combustion engine), 12 ... Intake pipe, 16 ... Throttle valve, 21 (A, B) ... Fuel injection valve, 22 ... Spark plug, 23 ... Exhaust pipe, 24 ... Exhaust gas sensor, 30 ... ECU (abnormality diagnosis) Means, fail-safe control means), 31 ... intake port, 32 ... exhaust port

Claims (3)

内燃機関の各気筒毎にそれぞれ複数の燃料噴射弁を設けた内燃機関の異常診断装置において、
前記燃料噴射弁の異常診断を行う際に、各気筒の前記複数の燃料噴射弁を1つずつ切り替えて噴射させてトルク変動又は燃焼状態の変動の有無を判定し、その判定結果に基づいて前記複数の燃料噴射弁の中から異常な燃料噴射弁を特定する異常診断手段を備えていることを特徴とする内燃機関の異常診断装置。
In the internal combustion engine abnormality diagnosis device provided with a plurality of fuel injection valves for each cylinder of the internal combustion engine,
When performing an abnormality diagnosis of the fuel injection valve, the plurality of fuel injection valves of each cylinder are switched and injected one by one to determine the presence or absence of torque fluctuation or combustion state fluctuation, and based on the determination result, An abnormality diagnosis apparatus for an internal combustion engine, comprising abnormality diagnosis means for identifying an abnormal fuel injection valve from a plurality of fuel injection valves.
前記異常診断手段により異常と特定された燃料噴射弁の噴射動作を禁止して残りの燃料噴射弁のみで要求噴射量相当分の燃料量を噴射するように当該残りの燃料噴射弁の噴射量を増量補正するフェールセーフ手段を備えていることを特徴とする請求項1に記載の内燃機関の異常診断装置。   The injection amount of the remaining fuel injection valve is set so that the injection operation of the fuel injection valve identified as abnormal by the abnormality diagnosis means is prohibited and the fuel amount corresponding to the required injection amount is injected only by the remaining fuel injection valve. 2. The abnormality diagnosis apparatus for an internal combustion engine according to claim 1, further comprising fail-safe means for correcting the increase. 前記フェールセーフ手段は、前記異常診断手段によりいずれかの気筒で異常な燃料噴射弁を検出したときに、当該異常な燃料噴射弁の位置と同じ位置の燃料噴射弁の噴射動作を全気筒禁止して、残りの燃料噴射弁のみで燃料を増量補正して噴射することを特徴とする請求項1又は2に記載の内燃機関の異常診断装置。   The fail-safe means prohibits all cylinders from injecting the fuel at the same position as the abnormal fuel injection valve when the abnormal diagnosis means detects an abnormal fuel injection valve in any cylinder. The abnormality diagnosis apparatus for an internal combustion engine according to claim 1 or 2, wherein the fuel is increased and corrected only by the remaining fuel injection valves.
JP2008027991A 2008-01-31 2008-02-07 Abnormality diagnosis device for internal combustion engine Expired - Fee Related JP4868173B2 (en)

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