JP3867189B2 - Intake system abnormality detection device - Google Patents

Intake system abnormality detection device Download PDF

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JP3867189B2
JP3867189B2 JP2000015336A JP2000015336A JP3867189B2 JP 3867189 B2 JP3867189 B2 JP 3867189B2 JP 2000015336 A JP2000015336 A JP 2000015336A JP 2000015336 A JP2000015336 A JP 2000015336A JP 3867189 B2 JP3867189 B2 JP 3867189B2
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pressure value
value
pressure
pressure sensor
intake system
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JP2001207905A (en
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多聞 田中
広志 虫上
節雄 西原
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Mitsubishi Motors Corp
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Mitsubishi Motors Corp
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Description

【0001】
【発明の属する技術分野】
本発明は、圧力センサにより吸気系の圧力を検出する内燃機関において、吸気系、即ち、圧力センサ及び吸気経路の異常を判定する吸気系の異常検出装置に関する。
【0002】
【従来の技術】
内燃機関(エンジン)の吸気圧力は、吸気通路に設けられた圧力センサにより検出され、検出された吸気圧力値に応じて燃料量等が制御される。従って、吸気圧力を検出する圧力センサの検出値は正確であることが求められている。しかし、圧力センサ自体の故障や、エアクリーナの詰まり等による吸気経路の目詰まりや、排気ガス導入による異物(すす等)の吸気経路への混入による目詰まり等により、圧力センサの検出値に異常(吸気系の異常)が生じる場合が考えられる。そこで、従来から、圧力センサの故障や吸気経路の異常を判定する異常検出装置が提案されている(例えば、特開平9-112316号公報参照)。
【0003】
従来の異常検出装置は、吸気圧センサにより吸気圧力を検出し、安定した状態での吸気圧センサの検出値の学習値、即ち、所定の基準値と吸気圧センサの現在の検出値とを比較し、その差が大きいときに吸気圧センサの異常を含む吸気系の異常を判定するようにしている。このため、大気圧センサを用いることなく基準となる吸気圧値を導出し、基準値に基づき圧力センサ自体が故障して正常に機能していないこと、もしくは吸気経路に目詰まり等の異常が生じていることを判定することができる。
【0004】
【発明が解決しようとする課題】
しかしながら、従来の異常検出装置は、所定の基準値を学習した場所と吸気圧センサにより吸気圧力を検出した場所との間で環境に大きな変化があった場合、例えば、所定の基準値を導出した後に急坂を登坂して吸気圧センサにより吸気圧力を検出する場所と所定の基準値を導出した場所とに大幅な高度差が生じた場合、現在の検出値が高度差に伴う圧力変化を反映したものとなり、圧力センサや吸気経路が正常なときでも検出値と基準値との差が大きくなって吸気系の異常を判定してしまう。また、吸気温度に変化が生じた場合にも吸気圧センサの検出値が温度変化の影響を受けて正確な判定ができなくなる虞があった。
【0005】
本発明は上記状況に鑑みてなされたもので、大気圧センサを用いることなく環境の変化が生じても正確に吸気系の異常を判定することができる吸気系の異常検出装置を提供することを目的とする。
【0006】
【課題を解決するための手段】
上記目的を達成するため請求項1の本発明では、内燃機関の吸気系の圧力を検出する圧力センサを設け、圧力センサの検出値を基に吸気系の異常判定を行なう吸気系の異常検出装置において、内燃機関のアイドリング状態での圧力センサの圧力値を基準圧力値として記憶する圧力記憶手段と、基準圧力値が記憶された後に基準圧力値と内燃機関の所定負荷条件以上の作動状態の圧力センサの検出圧力値とを比較して吸気系の異常判定を行なうと共に基準圧力値が記憶されて所定時間を経過すると吸気系の異常判定を禁止する判定制御手段とを備え、内燃機関が再びアイドリング状態となったとき、圧力記憶手段は圧力センサの圧力値を基準圧力値として再度記憶し、判定制御手段による吸気系の異常判定を開始するようにしたものである。
【0007】
また、請求項2の本発明では、請求項1の構成に追加して、停止異常判定手段により、予め設定された停止基準圧力値と内燃機関の停止中の圧力センサの検出圧力値とを比較して停止時における吸気系の異常判定を行なうようにしたものである。
【0008】
具体的には、内燃機関は吸気圧が略大気圧に相当するディーゼルエンジンであり、所定作動状態での圧力センサの圧力値である基準値は、アイドリング状態での圧力センサの圧力値であることが好ましい。そして、ディーゼルエンジンが所定の回転数でアクセル開度が所定開度以上のときの圧力センサの圧力値を内燃機関の作動中の圧力センサの検出圧力値とし、基準値に対して圧力センサの検出圧力値が高くなっていないときに吸気系の異常を判定することが好ましい。この判定に先立ち、停止異常判定手段により、ディーゼルエンジンが回転していないときにおける圧力センサの圧力値を、考えられ得る最低圧力値(停止基準圧力値)と比較し、圧力センサの圧力値が最低圧力値以下になったときに圧力センサ自体の異常を判定することが好ましい。
【0009】
【発明の実施の形態】
図1には本発明の一実施形態例に係る吸気系の異常検出装置を備えた内燃機関(ディーゼルエンジン)の概略構成、図2には判定制御手段及び停止異常判定手段の制御フローチャートを示してある。
【0010】
図1に示すように、ディーゼルエンジン(エンジン)1の各気筒には燃焼室2が形成され、燃焼室2毎に吸気弁11により開閉される吸気ポート3が設けられている。吸気ポート3には吸気通路4が連結され、吸気通路4にはエアクリーナ5、過給機6及びインタークーラ7を介して外気が吸入され(図中白矢印)、吸気通路4から燃焼室2に外気が導入される。また、燃焼室2毎に排気弁12を介して開閉される排気ポート9が設けられ、排気ポート9には排気通路8が連結されている。排気通路8は過給機6につながり、排気ガスは過給機6を回転させて吸気を過給した後、触媒10を介して外部に排出される(図中黒矢印)。
【0011】
吸気通路4と排気通路9とはEGR通路21により連通し、EGR通路21はEGR弁22により開閉されて適宜量の排気ガスが吸気通路4に混入される。吸気通路4に排気ガスを混入することにより、空気過剰率を適宜制御し、窒素酸化物(NOX )及び浮遊粒子状物質(PM)を最小限に抑制している。ディーゼルエンジンは吸気絞りを有していないため、空気過剰率を制御するために吸入空気量を制御することができず、排気ガスの吸気通路4への混入により空気過剰率を制御して窒素酸化物(NOX )及び浮遊粒子状物質(PM)を最小限に抑制している。
【0012】
EGR弁22の下流側における吸気通路4には、吸気温度を検出する吸気温センサ25及びブースト圧ホース26を介して吸気圧力を検出する圧力センサとしてのブースト圧センサ27が設けられている。また、エンジン1のクランク角を検出してエンジン回転数Neを検出するクランク角センサ28が設けられ、吸気温センサ25、ブースト圧センサ27及びクランク角センサ28の検出情報はECU29に入力される。また、ECU29にはアクセル開度(APS) 情報が入力され、これらの情報により、ECU29からは燃料噴射ポンプ30の電子ガバナ31及びタイマ制御バルブ32に制御信号が送られ、燃料噴射量が制御される。
【0013】
ECU29には、エンジン1の所定作動状態であるアイドリング時のブースト圧センサ27の検出圧力値Pを略大気圧に相当する基準圧力値Paとして記憶する圧力記憶手段が備えられている。また、ECU29には、基準圧力値Paが記憶された後に、エンジン1の作動中{例えば、エンジン回転数NeがNrpm (1600rpm )以上、APS がX%(70%)以上:平地の場合大気圧に対して約250mmHg 上昇する作動状態}のブースト圧センサ27の検出圧力値Pと基準圧力値Paとを比較し、ブースト圧センサ27の検出圧力値Pが、余裕をもって250mmHg より小さい所定値P1(例えば100mmHg)を基準圧力値Paに加えた値を越えていない場合に吸気系の異常判定を行なう判定制御手段が備えられている。
【0014】
更に、判定制御手段は、基準圧力値Paが記憶されて経過時間Tが所定時間tに到達すると、例えば、所定時間tが300sec(100mmHg の圧力差を生じる高低差は約1000m であり、約1000m の高度を最速で上昇できると考えられる最短の走行時間は約300secとなる)になると、基準圧力値Paが記憶されたときとブースト圧センサ27の検出時とに環境の変化、即ち、判定に影響を及ぼす圧力変化が生じる高度差が発生して基準圧力値Pa+所定値P1より過度に低い吸気圧力値になる可能性があるため、吸気系の異常判定を禁止する機能を有している。尚、高低差を要因とする場合を基に所定時間tを選定しているが、他の環境変化(温度差等)を所定時間tの選定要因として適用することも可能である。
【0015】
従って、大気圧センサを用いることなく環境の変化が生じても吸気系の異常を判定するための値を高精度に保持することができ、異常を正確に判定することが可能になる。
【0016】
また、ECU29には、予め設定された停止基準圧力値、例えば、車両が走行する際に考えられ得る最低圧力値P2(例えば、300mmHg:高度6000m 相当)と、エンジン1が回転していないときにおけるブースト圧センサ27の検出圧力値P、即ち、エンジン1の停止中のブースト圧センサ27の検出圧力値Pとを比較し、ブースト圧センサ27の検出圧力値Pが最低圧力値P2に満たない場合、ブースト圧センサ27の出力がないと判定され、停止時における吸気系(ブースト圧センサ27自体)の異常判定を行なう停止異常判定手段が備えられている。
【0017】
図2に基づいて判定制御手段及び停止異常判定手段を詳細に説明する。
【0018】
図に示すように、ステップS1でIGスイッチがオンで且つエンジン回転数Neが0rpm か否か、即ち、エンジン1が回転していないか否かが判断される。ステップS1でエンジン1が回転していないと判断された場合、ステップS2で車両が走行する際に考えられ得る最低圧力値P2(例えば、300mmHg:高度6000m 相当)と、現在のブースト圧センサ27の検出圧力値Pとが比較される。ステップS2で検出圧力値Pが最低圧力値P2に満たないと判断された場合、ブースト圧センサ27の出力がないと判定され、停止時にブースト圧センサ27が異常であると判断されて(停止異常判定手段)、ブースト圧センサ27自体が電気配線の断線等の異常である旨の警告灯AをステップS3で点灯させる。
【0019】
ステップS1でエンジン1が回転していると判断された場合、及び、ステップS2で検出圧力値Pが最低圧力値P2に満たなくはない、即ち、検出圧力値Pが最低圧力値P2以上であると判断された場合、ステップS4でエンジン1が所定作動状態であるアイドリング中か否かが判断される。ステップS4でエンジン1がアイドリング中であると判断された場合、ステップS5でブースト圧センサ27の検出圧力値Pを基準圧力値Pa(略大気圧に相当)として記憶する(圧力記憶手段)。つまり、ディーゼルエンジンの場合、吸気絞りが備えられていない、もしくはアイドル時には吸気絞りが使用されないので、アイドリング中のブースト圧センサ27の検出圧力値Pが略大気圧と等しくなりブースト圧センサ27の検出圧力値P(基準圧力値Pa)を大気圧とみなすことができる。
【0020】
ステップS5で検出圧力値Pを基準圧力値Paとして記憶した後、ステップS6で基準圧力値Paが判定値P3以上か否かが判断される。判定値P3は、例えば、600mmHg (高度2000m に相当しブースト圧センサ27の検出圧力値Pが十分に上がらない可能性がある環境条件)に設定されている。ステップS6で略大気圧相当の基準圧力値Paが判定値P3以上であると判断された場合、十分にブースト圧センサ27の検出圧力値Pが上がる場所であるのでステップS7でタイマをスタートさせ、ステップS4に移行する。ステップS6で基準圧力値Paが判定値P3に満たないと判断された場合、ブースト圧センサ27の検出圧力値Pが十分に上がらない可能性があるため、リターンとなる。
【0021】
ステップS4でエンジン1がアイドリング中ではないと判断された場合、ステップS8で基準圧力値Paが記憶済であるか否かが判断される。通常、エンジン1を始動させた後はアイドリング状態を経て車両を走行させるため、前述したステップS4乃至からステップS7の処理が実行されてから基準圧力値Paが記憶済であり、ステップS8では、基準圧力値Paが記憶済であると判断される。万一、ステップS8で基準圧力値Paが記憶されていないと判断された場合リターンとなり、必ず基準圧力値Paを記憶した後に次のステップに移行できるようになっている。
【0022】
ステップS8で基準圧力値Paが記憶済であると判断された後、タイマをスタート(ステップS7)させてから所定時間を経過したかがステップS9で判断される。即ち、ステップS9では経過時間Tが所定時間t以下か否かが判断される。ステップS9で経過時間Tが所定時間tを越えると判断された場合、記憶された基準圧力値PaをステップS10で消去してリターンとなる(異常判定を禁止する機能)。
【0023】
例えば、基準圧力値Paを記憶した後に車両が約1000m の高度を最速で上昇したと仮定すると、約100mmHg の圧力差が生じることになる。ブースト圧センサ27は絶対圧力を検出するため100mmHg の圧力差が生じると、基準圧力値Paに対してブースト圧センサ27の検出値が過度に低い値になる虞がある。このため、約1000m の高度を最速で上昇できると考えられる最短の走行時間として所定時間t(例えば300sec)を設定し、経過時間Tが所定時間tを越えた場合には判定に影響を及ぼす環境変化(高度差)が生じる可能性があるためリターンとして異常判定の処理を禁止し、再度基準圧力値Paを記憶できるようにしている。
【0024】
従って、大気圧センサを用いることなく環境の変化(高度差)が生じても吸気系の異常を判定するための基準圧力値Paを高精度に保持することができるようになる。
【0025】
ステップS9で経過時間Tが所定時間t以下であると判断された場合、即ち、基準圧力値Paを記憶してから高度等の環境に大きな変化が生じていないと判断された場合、ステップS11でエンジン回転数NeがNrpm (例えば1600rpm )以上で且つAPS がX%(例えば70%)以上か否か、即ち、エンジン1がある負荷条件以上にあるか否かが判断される。エンジン1がある負荷条件以上にあれば、平地の場合、大気圧に対して吸気圧力は相対的にP0(例えば約250mmHg )上昇する。ステップS11でエンジン1がある負荷条件以上にあると判断された場合、ステップS9に移行し所定時間t内にエンジン1がある負荷条件以上の状態になるのを待つ。
【0026】
ステップS11でエンジン1がある負荷条件以上にあると判断された場合、ブースト圧センサ27の検出圧力値Pと、基準圧力値Paに所定値P1(例えば100mmHg)を加えた値とをステップS12で比較する。エンジン1がある負荷条件以上にあれば、平地の場合、大気圧に対して吸気圧力は相対的にP0上昇するので、余裕をもってP0より小さい所定値P1を基準圧力値Paに加えて検出圧力値Pとの比較値としている。
【0027】
ステップS12で検出圧力値Pが基準圧力値Paに所定値P1を加えた値(Pa+P1)以上であると判断された場合、ブースト圧センサ27の検出値が正常に得られているので、リターンとなる。ステップS12で検出圧力値Pが値(Pa+P1)に満たないと判断された場合、吸気圧力が基準圧力値Paに対して所定状態上昇していないので、吸気系に目詰まり等が生じている虞があるため(前述したステップS2でブースト圧センサ27自体に異常は生じていないと判断されている)、吸気経路等に異常が生じている旨の警告灯BをステップS13で点灯させる。
【0028】
従って、吸気系の異常判定に影響を及ぼす環境変化(高度差)が生じていないことを前提にして、大気圧センサを用いることなくブースト圧センサ27自体の異常及び吸気系の目詰まり等の異常を判断することができる。
【0029】
上記実施形態例では、ブースト圧センサ27自体の異常を警告する警告灯Aと吸気経路の異常を警告する警告灯Bを備えているが、一つの警告灯で、単に吸気系の異常を警告するようにしてもよい。また、アイドリング時に吸気絞りの影響を受けないディーゼルエンジンに適用しいるが、アイドリング時に吸気が絞られるエンジンの場合であっても、それに応じて基準圧力値Paや比較値を補正することで、上記技術を適用することが可能である。
【0030】
上述した実施形態例では、エンジン1のアイドリング状態でのブースト圧センサ27の検出値を大気圧に対応する基準圧力値Paとして記憶し、基準圧力値Paが記憶された後、基準圧力値Paに所定値P1を加えた値とエンジン1の作動中のブースト圧センサ27の検出圧力値Pとを比較し、ブースト圧センサ27の検出圧力値Pが(Pa+P1)に満たない場合に吸気経路の異常を判断している。そして、基準圧力値Paが記憶された後に所定時間tが経過すると環境(高低差)の変化が生じた虞があるため異常の判断を禁止している。このため、大気圧センサを用いることなく環境の変化が生じても基準圧力値Paを正確に保つことが可能になり、吸気系の異常を正確に判断することができる。
【0031】
また、エンジン1のアイドリング中にブースト圧センサ27の検出圧力値Pが最低圧力値P2以上であるか否かを判断しているので、停止時におけるブースト圧センサ27(吸気系)自体の異常を判断することができ、上述した基準値と検出値との比較により判断できない異常を判断できる。
【0032】
【発明の効果】
請求項1に係る本発明では、内燃機関の吸気系の圧力を検出する圧力センサを設け、圧力センサの検出値を基に吸気系の異常判定を行なう吸気系の異常検出装置において、内燃機関のアイドリング状態での圧力センサの圧力値を基準圧力値として記憶する圧力記憶手段と、基準圧力値が記憶された後に基準圧力値と内燃機関の所定負荷条件以上の作動状態の圧力センサの検出圧力値とを比較して吸気系の異常判定を行なうと共に基準圧力値が記憶されて所定時間を経過すると吸気系の異常判定を禁止する判定制御手段とを備え、内燃機関が再びアイドリング状態となったとき、圧力記憶手段は圧力センサの圧力値を基準圧力値として再度記憶し、判定制御手段による吸気系の異常判定を開始したので、大気圧センサを用いることなく環境の変化が生じても吸気系の異常を正確に判定することが可能になる。
【0033】
請求項2に係る本発明では、請求項1の構成に追加して、停止異常判定手段により、予め設定された停止基準圧力値と内燃機関の停止中の圧力センサの検出圧力値とを比較して異常判定を行なうようにしたので、停止時における吸気系の異常判定が可能になる。
【図面の簡単な説明】
【図1】本発明の一実施形態例に係る吸気系の異常検出装置を備えた内燃機関(ディーゼルエンジン)の概略構成図。
【図2】判定制御手段及び停止異常判定手段の制御フローチャート。
【符号の説明】
1 ディーゼルエンジン(エンジン)
3 吸気ポート
4 吸気通路
5 エアクリーナ
6 過給機
26 ブースト圧ホース
27 ブースト圧センサ
29 ECU
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an abnormality detection device for an intake system that determines an abnormality in an intake system, that is, a pressure sensor and an intake path, in an internal combustion engine that detects the pressure of the intake system using a pressure sensor.
[0002]
[Prior art]
The intake pressure of the internal combustion engine (engine) is detected by a pressure sensor provided in the intake passage, and the fuel amount and the like are controlled according to the detected intake pressure value. Therefore, the detection value of the pressure sensor that detects the intake pressure is required to be accurate. However, the detection value of the pressure sensor is abnormal (due to clogging of the intake path due to clogging of the pressure sensor itself, air cleaner clogging, etc., or clogging due to foreign matter (soot etc.) entering the intake path due to exhaust gas introduction ( An abnormality in the intake system may occur. Therefore, conventionally, an abnormality detection device for determining a failure of a pressure sensor or an abnormality in an intake path has been proposed (see, for example, Japanese Patent Application Laid-Open No. 9-12316).
[0003]
The conventional abnormality detection device detects the intake pressure by the intake pressure sensor, and compares the learning value of the detected value of the intake pressure sensor in a stable state, that is, a predetermined reference value and the current detected value of the intake pressure sensor. When the difference is large, the abnormality of the intake system including the abnormality of the intake pressure sensor is determined. For this reason, a reference intake pressure value is derived without using an atmospheric pressure sensor, and the pressure sensor itself fails due to the reference value and is not functioning normally, or an abnormality such as clogging occurs in the intake path. Can be determined.
[0004]
[Problems to be solved by the invention]
However, the conventional abnormality detection device derives the predetermined reference value when there is a large change in the environment between the place where the predetermined reference value is learned and the place where the intake pressure is detected by the intake pressure sensor, for example. If there is a large difference in altitude between the location where the intake pressure is detected by the intake pressure sensor and the location where the predetermined reference value is derived, the current detected value reflects the pressure change associated with the altitude difference. Even when the pressure sensor and the intake path are normal, the difference between the detected value and the reference value becomes large, and abnormality of the intake system is determined. Further, even when the intake air temperature changes, there is a possibility that the detected value of the intake pressure sensor is affected by the temperature change and cannot be accurately determined.
[0005]
The present invention has been made in view of the above situation, and provides an intake system abnormality detection device that can accurately determine an abnormality in an intake system even if an environmental change occurs without using an atmospheric pressure sensor. Objective.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention of claim 1, a pressure sensor for detecting the pressure of the intake system of the internal combustion engine is provided, and an abnormality detection device for the intake system that performs an abnormality determination of the intake system based on the detected value of the pressure sensor A pressure storage means for storing the pressure value of the pressure sensor in an idling state of the internal combustion engine as a reference pressure value, and a pressure in an operating state equal to or higher than the reference pressure value and a predetermined load condition of the internal combustion engine after the reference pressure value is stored Comparing with the detected pressure value of the sensor, the abnormality determination of the intake system is performed, and the reference pressure value is stored and determination control means for prohibiting the determination of the abnormality of the intake system when a predetermined time elapses, and the internal combustion engine is idling again. When the state is reached, the pressure storage means stores the pressure value of the pressure sensor again as a reference pressure value, and starts the intake system abnormality determination by the determination control means .
[0007]
Further, in the present invention of claim 2, in addition to the configuration of claim 1, the stop abnormality determination means compares the preset stop reference pressure value with the detected pressure value of the pressure sensor while the internal combustion engine is stopped. Thus, abnormality determination of the intake system at the time of stopping is performed.
[0008]
Specifically, the internal combustion engine is a diesel engine whose intake pressure corresponds to approximately atmospheric pressure, and the reference value that is the pressure value of the pressure sensor in a predetermined operating state is the pressure value of the pressure sensor in the idling state. Is preferred. The pressure value of the pressure sensor when the diesel engine is at a predetermined speed and the accelerator opening is greater than or equal to the predetermined opening is used as the detected pressure value of the pressure sensor during operation of the internal combustion engine, and the pressure sensor detects the reference value. It is preferable to determine abnormality of the intake system when the pressure value is not high. Prior to this determination, the stop abnormality determination means compares the pressure value of the pressure sensor when the diesel engine is not rotating with the lowest possible pressure value (stop reference pressure value), and the pressure value of the pressure sensor is the lowest. It is preferable to determine whether or not the pressure sensor itself is abnormal when the pressure value falls below the pressure value.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a schematic configuration of an internal combustion engine (diesel engine) provided with an intake system abnormality detection device according to an embodiment of the present invention, and FIG. 2 shows a control flowchart of a determination control means and a stop abnormality determination means. is there.
[0010]
As shown in FIG. 1, a combustion chamber 2 is formed in each cylinder of a diesel engine (engine) 1, and an intake port 3 that is opened and closed by an intake valve 11 is provided for each combustion chamber 2. An intake passage 4 is connected to the intake port 3, and outside air is sucked into the intake passage 4 via an air cleaner 5, a supercharger 6 and an intercooler 7 (white arrows in the figure), and the intake passage 4 enters the combustion chamber 2. Outside air is introduced. Each combustion chamber 2 is provided with an exhaust port 9 that is opened and closed via an exhaust valve 12, and an exhaust passage 8 is connected to the exhaust port 9. The exhaust passage 8 is connected to the supercharger 6, and the exhaust gas is supercharged by rotating the supercharger 6, and then discharged outside through the catalyst 10 (black arrow in the figure).
[0011]
The intake passage 4 and the exhaust passage 9 communicate with each other by an EGR passage 21, and the EGR passage 21 is opened and closed by an EGR valve 22 so that an appropriate amount of exhaust gas is mixed into the intake passage 4. By mixing exhaust gas into the intake passage 4, the excess air ratio is appropriately controlled, and nitrogen oxides (NO X ) and suspended particulate matter (PM) are suppressed to a minimum. Since the diesel engine does not have an intake throttle, the intake air amount cannot be controlled in order to control the excess air ratio, and nitrogen excess is controlled by controlling the excess air ratio by mixing exhaust gas into the intake passage 4. things the (NO X) and suspended particulate matter (PM) are minimized.
[0012]
The intake passage 4 on the downstream side of the EGR valve 22 is provided with an intake temperature sensor 25 for detecting the intake air temperature and a boost pressure sensor 27 as a pressure sensor for detecting the intake air pressure via the boost pressure hose 26. Further, a crank angle sensor 28 that detects the crank angle of the engine 1 to detect the engine speed Ne is provided, and detection information of the intake air temperature sensor 25, the boost pressure sensor 27, and the crank angle sensor 28 is input to the ECU 29. Further, accelerator opening (APS) information is input to the ECU 29, and based on these information, a control signal is sent from the ECU 29 to the electronic governor 31 and the timer control valve 32 of the fuel injection pump 30 to control the fuel injection amount. The
[0013]
The ECU 29 is provided with pressure storage means for storing the detected pressure value P of the boost pressure sensor 27 during idling when the engine 1 is in a predetermined operating state as a reference pressure value Pa corresponding to substantially atmospheric pressure. In addition, after the reference pressure value Pa is stored in the ECU 29, the engine 1 is in operation {for example, the engine speed Ne is N rpm (1600 rpm) or more, and the APS is X% (70%) or more: The detected pressure value P of the boost pressure sensor 27 and the reference pressure value Pa in an operating state in which the operating pressure is increased by about 250 mmHg relative to the reference pressure value Pa are compared, and the detected pressure value P of the boost pressure sensor 27 is less than a predetermined value P1 (less than 250 mmHg) For example, when the value obtained by adding 100 mmHg) to the reference pressure value Pa is not exceeded, there is provided a determination control means for determining abnormality in the intake system.
[0014]
Further, when the reference pressure value Pa is stored and the elapsed time T reaches the predetermined time t, the determination control means, for example, has a predetermined time t of 300 sec (the height difference causing the pressure difference of 100 mmHg is about 1000 m and about 1000 m When the reference pressure value Pa is stored and when the boost pressure sensor 27 is detected, the change in the environment, that is, the determination is made. Since there is a possibility that an altitude difference in which an influential pressure change occurs and the intake pressure value is excessively lower than the reference pressure value Pa + predetermined value P1, it has a function of prohibiting abnormality determination of the intake system. Although the predetermined time t is selected based on the case where the height difference is a factor, other environmental changes (temperature difference or the like) can be applied as a selection factor for the predetermined time t.
[0015]
Therefore, even if an environmental change occurs without using an atmospheric pressure sensor, a value for determining an abnormality in the intake system can be held with high accuracy, and the abnormality can be determined accurately.
[0016]
The ECU 29 also has a preset stop reference pressure value, for example, a minimum pressure value P2 that can be considered when the vehicle travels (for example, 300 mmHg: equivalent to an altitude of 6000 m), and when the engine 1 is not rotating. When the detected pressure value P of the boost pressure sensor 27 is compared with the detected pressure value P of the boost pressure sensor 27 while the engine 1 is stopped, and the detected pressure value P of the boost pressure sensor 27 is less than the minimum pressure value P2. Further, it is determined that there is no output from the boost pressure sensor 27, and there is provided a stop abnormality determination means for determining abnormality of the intake system (boost pressure sensor 27 itself) at the time of stop.
[0017]
The determination control means and the stop abnormality determination means will be described in detail based on FIG.
[0018]
As shown in the figure, it is determined in step S1 whether the IG switch is on and the engine speed Ne is 0 rpm, that is, whether the engine 1 is not rotating. If it is determined in step S1 that the engine 1 is not rotating, the minimum pressure value P2 that can be considered when the vehicle travels in step S2 (for example, 300 mmHg: equivalent to an altitude of 6000 m) and the current boost pressure sensor 27 The detected pressure value P is compared. If it is determined in step S2 that the detected pressure value P is less than the minimum pressure value P2, it is determined that there is no output from the boost pressure sensor 27, and it is determined that the boost pressure sensor 27 is abnormal when stopped (stop abnormality). Determination means), the warning light A indicating that the boost pressure sensor 27 itself is abnormal such as disconnection of the electrical wiring is turned on in step S3.
[0019]
When it is determined in step S1 that the engine 1 is rotating, and in step S2, the detected pressure value P is not less than the minimum pressure value P2, that is, the detected pressure value P is greater than or equal to the minimum pressure value P2. If it is determined, it is determined in step S4 whether or not the engine 1 is idling in a predetermined operating state. If it is determined in step S4 that the engine 1 is idling, the detected pressure value P of the boost pressure sensor 27 is stored as a reference pressure value Pa (corresponding to substantially atmospheric pressure) in step S5 (pressure storage means). That is, in the case of a diesel engine, the intake throttle is not provided, or the intake throttle is not used during idling. Therefore, the detected pressure value P of the boost pressure sensor 27 during idling becomes substantially equal to the atmospheric pressure, and the detection of the boost pressure sensor 27 is performed. The pressure value P (reference pressure value Pa) can be regarded as atmospheric pressure.
[0020]
After the detected pressure value P is stored as the reference pressure value Pa in step S5, it is determined in step S6 whether or not the reference pressure value Pa is greater than or equal to the determination value P3. The determination value P3 is set to, for example, 600 mmHg (environmental condition that corresponds to an altitude of 2000 m and the detected pressure value P of the boost pressure sensor 27 may not be sufficiently increased). If it is determined in step S6 that the reference pressure value Pa corresponding to substantially atmospheric pressure is equal to or greater than the determination value P3, the timer is started in step S7 because the detected pressure value P of the boost pressure sensor 27 is sufficiently increased. The process proceeds to step S4. If it is determined in step S6 that the reference pressure value Pa is less than the determination value P3, the detection pressure value P of the boost pressure sensor 27 may not be sufficiently increased, and thus a return is made.
[0021]
If it is determined in step S4 that the engine 1 is not idling, it is determined in step S8 whether or not the reference pressure value Pa has been stored. Usually, after the engine 1 is started, the vehicle travels through an idling state. Therefore, the reference pressure value Pa has been stored after the processing from step S4 to step S7 described above is executed. In step S8, the reference pressure value Pa is stored. It is determined that the pressure value Pa has been stored. If it is determined in step S8 that the reference pressure value Pa is not stored, a return is returned, and after the reference pressure value Pa is always stored, the process can proceed to the next step.
[0022]
After it is determined in step S8 that the reference pressure value Pa has been stored, it is determined in step S9 whether a predetermined time has elapsed since the timer was started (step S7). That is, in step S9, it is determined whether the elapsed time T is equal to or shorter than the predetermined time t. If it is determined in step S9 that the elapsed time T exceeds the predetermined time t, the stored reference pressure value Pa is erased in step S10 and a return is made (function for prohibiting abnormality determination).
[0023]
For example, assuming that the vehicle has risen at an altitude of about 1000 m at the fastest speed after storing the reference pressure value Pa, a pressure difference of about 100 mmHg is generated. Since the boost pressure sensor 27 detects an absolute pressure, if a pressure difference of 100 mmHg occurs, the detection value of the boost pressure sensor 27 may be excessively lower than the reference pressure value Pa. For this reason, a predetermined time t (for example, 300 seconds) is set as the shortest traveling time that can be considered to increase the altitude of about 1000 m at the highest speed, and the environment that affects the determination when the elapsed time T exceeds the predetermined time t. Since a change (altitude difference) may occur, the abnormality determination process is prohibited as a return, and the reference pressure value Pa can be stored again.
[0024]
Therefore, even if an environmental change (altitude difference) occurs without using an atmospheric pressure sensor, the reference pressure value Pa for determining an intake system abnormality can be maintained with high accuracy.
[0025]
If it is determined in step S9 that the elapsed time T is less than or equal to the predetermined time t, that is, if it is determined that no significant change has occurred in the environment such as altitude after storing the reference pressure value Pa, in step S11. It is determined whether the engine speed Ne is N rpm (for example, 1600 rpm) or more and the APS is X% (for example, 70%) or more, that is, whether the engine 1 is above a certain load condition. If the engine 1 is above a certain load condition, the intake pressure rises relative to atmospheric pressure by P 0 (for example, about 250 mmHg) in the case of flat ground. If it is determined in step S11 that the engine 1 is above a certain load condition, the process proceeds to step S9 and waits for the engine 1 to be in a state above the certain load condition within a predetermined time t.
[0026]
If it is determined in step S11 that the engine 1 is above a certain load condition, the detected pressure value P of the boost pressure sensor 27 and a value obtained by adding a predetermined value P1 (for example, 100 mmHg) to the reference pressure value Pa are determined in step S12. Compare. If the engine 1 is above a certain load condition, in the case of flat ground, the intake pressure rises by P 0 relative to the atmospheric pressure, so it is detected by adding a predetermined value P1 smaller than P 0 to the reference pressure value Pa with a margin. A comparison value with the pressure value P is used.
[0027]
If it is determined in step S12 that the detected pressure value P is equal to or greater than the value obtained by adding the predetermined value P1 to the reference pressure value Pa (Pa + P1), since the detected value of the boost pressure sensor 27 is normally obtained, Become. If it is determined in step S12 that the detected pressure value P is less than the value (Pa + P1), the intake pressure has not risen in a predetermined state with respect to the reference pressure value Pa. Therefore, it is determined that no abnormality has occurred in the boost pressure sensor 27 itself in step S2 described above. Therefore, a warning lamp B indicating that an abnormality has occurred in the intake path or the like is turned on in step S13.
[0028]
Therefore, on the premise that there is no environmental change (altitude difference) affecting the abnormality determination of the intake system, the abnormality of the boost pressure sensor 27 itself and the abnormality of the intake system are clogged without using the atmospheric pressure sensor. Can be judged.
[0029]
In the above embodiment, the warning light A that warns the abnormality of the boost pressure sensor 27 itself and the warning light B that warns of the abnormality of the intake path are provided. However, only one warning light warns of the abnormality of the intake system. You may do it. Although it is applied to a diesel engine that is not affected by the intake throttle when idling, even if the engine is throttled when idling, the reference pressure value Pa and the comparison value are corrected accordingly. Technology can be applied.
[0030]
In the embodiment described above, the detected value of the boost pressure sensor 27 in the idling state of the engine 1 is stored as the reference pressure value Pa corresponding to the atmospheric pressure, and after the reference pressure value Pa is stored, the reference pressure value Pa is stored in the reference pressure value Pa. The value obtained by adding the predetermined value P1 and the detected pressure value P of the boost pressure sensor 27 during operation of the engine 1 are compared, and if the detected pressure value P of the boost pressure sensor 27 is less than (Pa + P1), the intake path is abnormal. Judging. Then, when a predetermined time t elapses after the reference pressure value Pa is stored, a change in the environment (level difference) may occur, so that the determination of abnormality is prohibited. For this reason, the reference pressure value Pa can be accurately maintained even if an environmental change occurs without using an atmospheric pressure sensor, and abnormality in the intake system can be accurately determined.
[0031]
Further, since it is determined whether or not the detected pressure value P of the boost pressure sensor 27 is equal to or higher than the minimum pressure value P2 during idling of the engine 1, the abnormality of the boost pressure sensor 27 (intake system) itself at the time of stop is determined. It is possible to determine an abnormality that cannot be determined by comparing the above-described reference value with the detected value.
[0032]
【The invention's effect】
According to the first aspect of the present invention, there is provided an intake system abnormality detection device that includes a pressure sensor that detects the pressure of the intake system of the internal combustion engine, and performs an abnormality determination of the intake system based on a detection value of the pressure sensor. Pressure storage means for storing the pressure value of the pressure sensor in the idling state as a reference pressure value, and the detected pressure value of the pressure sensor in an operating state exceeding the predetermined load condition of the internal combustion engine after the reference pressure value is stored And a determination control means for prohibiting the determination of abnormality of the intake system when a predetermined time has elapsed after the reference pressure value is stored and the internal combustion engine is in an idling state again. the pressure storage means stores again the pressure value of the pressure sensor as reference pressure value, so began abnormality determination of the intake system by the determination control unit, an environment without using the atmospheric pressure sensor strange Also it is possible to accurately determine the abnormality of the intake system occurs.
[0033]
According to the second aspect of the present invention, in addition to the configuration of the first aspect, the stop abnormality determining means compares the preset stop reference pressure value with the detected pressure value of the pressure sensor while the internal combustion engine is stopped. Therefore, the abnormality determination of the intake system at the time of stop can be performed.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an internal combustion engine (diesel engine) including an intake system abnormality detection device according to an embodiment of the present invention.
FIG. 2 is a control flowchart of a determination control unit and a stop abnormality determination unit.
[Explanation of symbols]
1 Diesel engine (engine)
3 Intake Port 4 Intake Passage 5 Air Cleaner 6 Supercharger 26 Boost Pressure Hose 27 Boost Pressure Sensor 29 ECU

Claims (2)

内燃機関の吸気系の圧力を検出する圧力センサを設け、上記圧力センサの検出値を基に吸気系の異常判定を行なう吸気系の異常検出装置において、上記内燃機関のアイドリング状態での上記圧力センサの圧力値を基準圧力値として記憶する圧力記憶手段、上記基準圧力値が記憶された後に上記基準圧力値と上記内燃機関の所定負荷条件以上の作動状態の上記圧力センサの検出圧力値とを比較して吸気系の異常判定を行なうと共に上記基準圧力値が記憶されて所定時間を経過すると吸気系の異常判定を禁止する判定制御手段を備え
上記内燃機関が再びアイドリング状態となったとき、上記圧力記憶手段は上記圧力センサの圧力値を基準圧力値として再度記憶し、上記判定制御手段による吸気系の異常判定を開始することを特徴とする吸気系の異常検出装置。
An intake system abnormality detection apparatus that includes a pressure sensor that detects an intake system pressure of an internal combustion engine and that determines an abnormality of the intake system based on a detection value of the pressure sensor, wherein the pressure sensor in an idling state of the internal combustion engine of a pressure storage means for storing a reference pressure value the pressure values, and a detected pressure value of the pressure sensor of the operating condition of more than a predetermined load condition of the reference pressure value and the internal combustion engine after the reference pressure value is stored compared the reference pressure value with an abnormality determination of the intake system is stored and a judgment control means for prohibiting an abnormality determination of the intake system to the predetermined time elapses,
When the internal combustion engine is idling again, the pressure storage means stores again the pressure value of the pressure sensor as a reference pressure value, and starts the abnormality determination of the intake system by the determination control means. Intake system abnormality detection device.
請求項1において、予め設定された停止基準圧力値と上記内燃機関の停止中の上記圧力センサの検出圧力値とを比較して停止時における吸気系の異常判定を行なう停止異常判定手段を備えたことを特徴とする吸気系の異常検出装置。  The stop abnormality determining means according to claim 1, comprising comparing a preset stop reference pressure value with a detected pressure value of the pressure sensor while the internal combustion engine is stopped, and determining abnormality of the intake system at the time of stop. Intake system abnormality detection device characterized by the above.
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