JP2004068734A

JP2004068734A - Incorrect operation preventing device for internal combustion engine

Info

Publication number: JP2004068734A
Application number: JP2002230599A
Authority: JP
Inventors: Masanori Komori; 小森　正憲
Original assignee: KOMOTETSUKU KK
Current assignee: KOMOTETSUKU KK
Priority date: 2002-08-07
Filing date: 2002-08-07
Publication date: 2004-03-04

Abstract

<P>PROBLEM TO BE SOLVED: To provide an incorrect operation preventing device for an internal combustion engine for securing the full effects of exhaust gas regulations by preventing the continuous incorrect operation of the internal combustion engine being operated with exhaust gas not passing through a normal filter. <P>SOLUTION: The incorrect operation preventing device 30 for the internal combustion engine 10 comprises a filter 21 provided in an exhaust passage 11 for trapping floating particulate materials contained in exhaust gas. When exhaust pressure on the filter 21 at the upstream side of the exhaust gas is lower than a set value at or after starting the internal combustion engine 10, the function of the internal combustion engine 10 is restricted. The restriction of the function of the internal combustion engine 10 means that the internal combustion engine is precluded from being started or is stopped, the output performance of the internal combustion engine 10 is lowered or the subsequent operation frequency of the internal combustion engine 10 is restricted, e.g. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、ディーゼルエンジンなどの内燃機関の排気に含まれる浮遊粒子状物質を捕集する排気浄化の技術分野に属し、この浮遊粒子状物質を捕集するフィルタを排気通路に設けた内燃機関における不正運転を防止するための装置に関する。
【０００２】
【従来の技術】
この種の排気浄化を行う装置として、内燃機関の排気通路に、排気に含まれる浮遊粒子状物質を捕集するフィルタを設けたものが知られている（例えば、特開平２−１８５６１１号公報、特開平１０−１３１７４０号公報を参照）。このような内燃機関では、フィルタが目詰まりすると、バーナや電気ヒータにより捕集された浮遊粒子状物質を燃焼させてフィルタを再生することが行われる。その場合、フィルタを２個並列に設け、片方のフィルタが目詰まりしたら排気を他方のフィルタに切り換え、その間に目詰まりしたフィルタを再生させる切り換え再生方式の排気浄化装置と、フィルタが目詰まりしたら内燃機関を停止してフィルタを再生させる停止再生方式の排気浄化装置とがある。また、フィルタは保守点検時、劣化による交換時等を想定して排気通路から取り外すことが可能になってはいるが、日常的に取り外すものではない。これを固定方式の排気浄化装置ということにする。これに対してフィルタを内燃機関の排気通路に脱着可能に設けた脱着方式の排気浄化装置が知られている（例えば特開平８−３５４１７号公報を参照）。さらに、この種のフィルタよりも排気上流側の排気通路に、排気を大気開放する大気開放手段を設け、この大気開放手段を開閉手段により開閉可能とした排気浄化装置が知られている（例えば特開２００２−８９２３５号公報を参照）。その場合、大気開放手段に代えて、排気をフィルタよりも排気下流側の排気通路にバイパスさせるバイパス通路を設け、このバイパス通路を開閉手段により開閉可能としても同様の効果が得られる。
【０００３】
【発明が解決しようとする課題】
排気通路にフィルタを設けると、浮遊粒子状物質の捕集が進むにつれて排気抵抗が増すので、内燃機関の出力性能が低下し、運転性の低下、燃料消費率の悪化等を招きやすい。また、停止再生方式の場合、フィルタ再生中は内燃機関を運転できないので、内燃機関使用の自由度が制限される。さらに、フィルタ再生には加熱のためのエネルギが必要であり、フィルタ等の保全も必要とされるので、コストがかさむ。そのため、排気ガス規制をクリアするために排気浄化装置を設けても、フィルタを取り外して内燃機関を運転する不正運転を行うことが予想される。また、フィルタが溶損したり破損してフィルタを貫通する孔があくと、フィルタの浮遊粒子状物質捕集機能が損なわれると同時に排気抵抗が低下する。その場合、フィルタを交換せずに内燃機関を運転する不正運転を行うことが予想される。さらに、大気開放手段は本来、フィルタが目詰まりしたときにフィルタの再生又は交換を行える状態になるまでの間、臨時に開くものであり、バイパス通路もそのように使うことができるが、この大気開放手段又はバイパス通路が開き放しになるよう操作して内燃機関を運転する不正運転を行うことが予想される。このような内燃機関の不正運転が行われると排気浄化が進まず、排気ガス規制の実効を担保することができない。
【０００４】
本発明はこのような点に着目してなされたものであり、その目的とするところは、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低くなったとき、これによって排気を正常なフィルタに通さないままに内燃機関を運転する不正運転が行われていることを推定し、内燃機関の機能を制限するようにして、不正運転の続行を有効に阻止し、排気ガス規制の実効を担保する内燃機関の不正運転防止装置を提供することにある。
【０００５】
【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の内燃機関の不正運転防止装置は、排気に含まれる浮遊粒子状物質を捕集するフィルタを排気通路に設けた内燃機関の不正運転防止装置であって、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは内燃機関の機能を制限するように構成したことを特徴ととしている。
【０００６】
フィルタの排気上流側の排気圧力が設定値よりも低いことで排気を正常なフィルタに通さないままに内燃機関を運転する不正運転が行われていると推定し、内燃機関の機能が制限されるので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【０００７】
請求項２の内燃機関の不正運転防止装置は、請求項１の構成において、内燃機関の機能制限が、内燃機関を始動不能にし若しくは停止させること、内燃機関の出力性能を低下させること、又はその後の内燃機関の運転回数を制限することである。
【０００８】
このようにすれば、フィルタの排気上流側の排気圧力が設定値よりも低いことを検出することで排気を正常なフィルタに通さないままに内燃機関を運転する不正運転が行われていると推定し、内燃機関を始動不能にし若しくは停止させ、内燃機関の出力性能を低下させ、又はその後の内燃機関の運転回数を制限するので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。その場合、内燃機関の出力性能が低下すると不正運転の続行が有効に阻止されるのは、加速が悪化して運転性が劣悪になる、必要な出力を得ることができない、燃料消費率が悪化するなどの症状が出るため、そのまま不正運転を続行する意欲がなくなるからである。
【０００９】
請求項３の内燃機関の不正運転防止装置は、排気に含まれる浮遊粒子状物質を捕集するフィルタを排気通路に設けた内燃機関の不正運転防止装置であって、フィルタの排気上流側の排気圧力を検出する圧力検出手段と、内燃機関の始動又は運転継続に係わる始動・運転継続関連手段と、圧力検出手段の出力を受け、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは内燃機関を始動不能にし又は停止させるように始動・運転継続関連手段を制御する不正運転防止手段とを備えたことを特徴としている。
【００１０】
不正運転防止手段により、圧力検出手段の出力に基づいて、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは始動・運転継続関連手段を制御して内燃機関を始動不能にし又は停止させる。このようにフィルタの排気上流側の排気圧力が設定値よりも低いことを検出することで排気を正常なフィルタに通さないままに内燃機関を運転する不正運転が行われていると推定し、内燃機関を始動不能にし又は停止させるので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００１１】
請求項４の内燃機関の不正運転防止装置は、排気に含まれる浮遊粒子状物質を捕集するフィルタを排気通路に設けた内燃機関の不正運転防止装置であって、フィルタの排気上流側の排気圧力を検出する圧力検出手段と、内燃機関の出力性能に係わる出力性能関連手段と、圧力検出手段の出力を受け、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは内燃機関の出力性能を低下させるように出力性能関連手段を制御する不正運転防止手段とを備えたことを特徴としている。
【００１２】
不正運転防止手段により、圧力検出手段の出力に基づいて、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは出力性能関連手段を制御して内燃機関の出力性能を低下させる。このようにフィルタの排気上流側の排気圧力が設定値よりも低いことを検出することで排気を正常なフィルタに通さないままに内燃機関を運転する不正運転が行われていると推定し、内燃機関の出力性能を低下させるので、加速が悪化して運転性が劣悪になる、必要な出力を得ることができない、燃料消費率が悪化するなどの症状が出ることになり、そのまま不正運転を続行する意欲がなくなり、不正運転の続行が困難となって有効に阻止され、排気ガス規制の実効が担保される。
【００１３】
請求項５の内燃機関の不正運転防止装置は、排気に含まれる浮遊粒子状物質を捕集するフィルタを排気通路に設けた内燃機関の不正運転防止装置であって、フィルタの排気上流側の排気圧力を検出する圧力検出手段と、内燃機関の運転回数をカウントする運転回数計測手段と、内燃機関の始動又は運転継続に係わる始動・運転継続関連手段と、圧力検出手段及び運転回数計測手段の出力を受け、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低くなると、その後の内燃機関の運転回数を制限するように始動・運転継続関連手段を制御する不正運転防止手段とを備えたことを特徴としている。
【００１４】
不正運転防止手段により、圧力検出手段及び運転回数計測手段の出力に基づいて、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは始動・運転継続関連手段を制御して、その後の内燃機関の運転回数を制限する。このようにフィルタの排気上流側の排気圧力が設定値よりも低いことを検出することで排気を正常なフィルタに通さないままに内燃機関を運転する不正運転が行われていると推定し、その後の内燃機関の運転回数を制限するので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００１５】
請求項６の内燃機関の不正運転防止装置は、請求項１、請求項２、請求項３又は請求項４の構成において、フィルタよりも排気上流側の排気通路が、内燃機関との接続口及びフィルタとの接続口を除いて閉鎖されており、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは内燃機関を始動不能にし若しくは停止させ、又は内燃機関の出力性能を低下させるように構成している。
【００１６】
このように大気開放手段又はバイパス通路などが設けられていない場合、不正運転防止手段により、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは即座に内燃機関を始動不能にし若しくは停止させ、又は内燃機関の出力性能を低下させるので、不正運転の続行が直ちに有効に阻止され、排気ガス規制の実効が担保される。
【００１７】
請求項７の内燃機関の不正運転防止装置は、請求項１、請求項２又は請求項５の構成において、フィルタよりも排気上流側の排気通路に、排気を大気開放する大気開放手段、又は排気をフィルタよりも排気下流側の排気通路にバイパスさせるバイパス通路が設けられ、この大気開放手段又はバイパス通路が開閉手段により開閉可能とされており、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは、その後の内燃機関の運転回数を制限するように構成している。
【００１８】
このように大気開放手段又はバイパス通路が設けられている場合、不正運転防止手段により、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは、即座に内燃機関を始動不能にし又は停止させるのではなく、その後の内燃機関の運転回数を制限するので、内燃機関の稼働時にフィルタが目詰まりしたときにフィルタの再生又は交換を行える状態になるまでの間、大気開放手段又はバイパス通路を開くことを許容しながら、その後の内燃機関を始動不能にし又は停止させ、不正運転の続行が有効に阻止されて排気ガス規制の実効が担保される。
【００１９】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて詳細に説明する。これらの不正運転防止装置は、自動車のような輸送用機器に搭載した内燃機関に設けてもよいし、例えば発電装置駆動用の内燃機関のように敷地に定着した内燃機関に設けてもよい。これらの内燃機関の排気通路には、排気に含まれる浮遊粒子状物質を捕集するフィルタが設けている。図１は不正運転防止装置の第１の実施形態を示す。図１において、１０は例えばディーゼルエンジン等の内燃機関、１１は内燃機関１０の排気通路であって、この排気通路１１には排気浄化装置２０が設けられている。排気浄化装置２０は、内部が排気通路１１の一部を構成するケーシングと、このケーシングのなかに設けられたフィルタ２１とを備えている。フィルタ２１は保守点検時、劣化による交換時等を想定してケーシングから取り外すことが可能になってはいるが、日常的に取り外すものではなく、この排気浄化装置２０は固定方式である。フィルタ２１は、一方の端面から入った排気を他方の端面から出し、この間に排気から浮遊粒子状物質を捕集する機能を発揮する。このフィルタ２１としては、例えば目封じタイプ、多孔体タイプ、繊維タイプがある。目封じタイプは、例えばセラミック等の材料で構成され、隔壁で区画された複数のセルを有する、いわゆるハニカム体であって、ハニカムを１セルずつ交互にその端を塞いだものであり、排気が壁を通過するときに浮遊粒子状物質を捕集する。例えば、一方の端面で各セルの端面がシール材によって交互に市松模様状に塞がれており、他方の端面では、上記一方の端面で塞がれたセルは開口し、上記一方の端面で開口していたセルはシール材によって塞がれた構造をしている。多孔体タイプ、繊維タイプは、例えば金属等の材料で構成され、排気が多孔体又は繊維の構成体に衝突することで浮遊粒子状物質を捕集する。しかし、本発明はフィルタの構造をこれらに限定するものではない。
【００２０】
第１実施形態の排気浄化装置２０は、更に再生手段２２を備えている。この再生手段２２は、フィルタ２１の周囲、例えばフィルタ２１よりも上流側の排気通路１１に設けられており、フィルタ２１が目詰まりすると内燃機関１０を停止して再生手段２２を作動させ、フィルタ２１に捕集された浮遊粒子状物質を燃焼させてフィルタ２１を再生するようにしている。従って、この排気浄化装置２０は先に説明した停止再生方式である。再生手段２２としては、例えば通電されると発熱する電気ヒータ、供給された燃料を燃焼させて発熱するバーナが例示される。従って、第１実施形態における内燃機関１０の不正運転は、フィルタ２１をケーシングから取り外して内燃機関１０を運転すること、フィルタ２１が溶損又は破損したときにフィルタ２１を交換せずに内燃機関を運転することである。
【００２１】
３０は不正運転防止装置であって、この不正運転防止装置３０は、内燃機関１０の始動時又は始動後にフィルタ２１の排気上流側の排気圧力が設定値よりも低いときは内燃機関１０の機能を制限するように構成している。内燃機関１０の機能を制限するとは、内燃機関１０の機能を正常時のときよりも低下させ又は無くすことをいう。この内燃機関１０の機能制限には、内燃機関１０を始動不能にし若しくは停止させること、内燃機関１０の出力性能を低下させること、又はその後の内燃機関１０の運転回数を制限することが含まれるが、このうち第１実施形態では内燃機関１０を始動不能にし若しくは停止させるようにしている。
【００２２】
図２に示すように、この不正運転防止装置３０は、フィルタ２１の排気上流側の排気圧力を検出する圧力検出手段３１と、内燃機関１０の始動又は運転継続に係わる始動・運転継続関連手段３２と、圧力検出手段３１の出力を受け、内燃機関１０の始動時又は始動後にフィルタ２１の排気上流側の排気圧力が設定値よりも低いときは内燃機関１０を始動不能にし又は停止させるように始動・運転継続関連手段３２を制御する不正運転防止手段３３とを備えている。
【００２３】
圧力検出手段３１は、例えばフィルタ２１の排気上流側の排気通路１１に設けた公知の圧力センサである。始動・運転継続関連手段３２は、内燃機関１０の始動又は運転継続に欠くことができない機能を発揮する手段である。始動・運転継続関連手段３２としては、例えば内燃機関１０の電源スイッチ又はキースイッチ、セルモータ、燃料ポンプ、燃料噴射ポンプ等が挙げられ、冬季等ではグロープラグも挙げられる。不正運転防止手段３３は、デジタル方式又はアナログ方式の電気回路で構成されるのが一般的である。不正運転防止手段３３では、内燃機関１０の始動時又は始動後に圧力検出手段３１の出力と、予め設定されている設定値とを比較し、例えば圧力検出手段３１の出力が設定値を下回るなどして、フィルタ２１の排気上流側の排気圧力が設定値よりも低いと判断されたときには、始動・運転継続関連手段３２の機能を停止して内燃機関１０を始動不能にし又は停止させる。始動・運転継続関連手段３２の機能を停止させるには、例えば電磁スイッチ等により始動・運転継続関連手段３２への電力供給を断つ、始動・運転継続関連手段３２への動作信号をキャンセルする信号を送るなどの方法により行う。上記設定値は、正常なフィルタ２１が排気通路１１のなかの所定の位置に存在すれば、始動時又は始動後にフィルタ２１の排気上流側で発生するであろう排気圧力であり、内燃機関１０に応じて定められる。このように圧力センサ等の出力に基づいて始動・運転継続関連手段３２を制御することに代えて、圧力検出手段３１及び不正運転防止手段３３の機能を機械的構成で実現してもよい。その場合は例えば、シリンダに弁体を摺動可能に嵌挿し、弁体の一方にフィルタ２１の排気上流側の排気圧力を導入し、他方に上記排気圧力に抗して弁体を付勢する弾性部材を設け、上記排気圧力が弾性部材により設定される設定値よりも低くなったときは弁体が一方に移動してリミットスイッチ等を閉じ、これによって内燃機関１０を始動不能にし又は停止させるように始動・運転継続関連手段３２を制御する。
【００２４】
従って、上記第１実施形態においては、フィルタ２１の排気上流側の排気圧力が設定値よりも低いことで排気を正常なフィルタ２１に通さないままに内燃機関１０を運転する不正運転が行われていると推定し、内燃機関１０の機能が制限されるので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００２５】
本発明は、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは内燃機関の機能を制限するように構成した不正運転防止装置の実施形態を全て含む。そのなかで、第１実施形態の不正運転防止装置３０は内燃機関１０の機能制限を、内燃機関１０を始動不能にし若しくは停止させることで行った。このようにすれば、フィルタ２１の排気上流側の排気圧力が設定値よりも低いことを検出することで排気を正常なフィルタ２１に通さないままに内燃機関１０を運転する不正運転が行われていると推定し、内燃機関１０を始動不能にし若しくは停止させるので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００２６】
以下、他の実施形態を説明するが、第１実施形態と同様の構成、作用及び効果については説明を省略し、異なる構成、作用及び効果のみを説明する。図３は第２実施形態の不正運転防止装置３０を示す。第１実施形態と異なるのは内燃機関１０の機能制限の内容であり、第１実施形態では内燃機関１０を始動不能にし若しくは停止させたが、第２実施形態では内燃機関１０の出力性能を低下させるようにしている。出力性能の低下は、例えば内燃機関１０へ供給する吸気の流量を絞ること、内燃機関１０から排出される排気の流量を絞ること、内燃機関１０へ供給する燃料の流量を絞ること等で行う。すなわち、図３に示すように、この不正運転防止装置３０は、フィルタ２１の排気上流側の排気圧力を検出する圧力検出手段３１と、内燃機関１０の出力性能に係わる出力性能関連手段３４と、圧力検出手段３１の出力を受け、内燃機関１０の始動時又は始動後にフィルタ２１の排気上流側の排気圧力が設定値よりも低いときは内燃機関１０の出力性能を低下させるように出力性能関連手段３４を制御する不正運転防止手段３３とを備えている。
【００２７】
圧力検出手段３１は、例えばフィルタ２１の排気上流側の排気通路１１に設けた公知の圧力センサである。出力性能関連手段３４は、内燃機関１０が本来の出力性能を発揮するに欠くことができない機能を発揮する手段である。出力性能関連手段３４としては、例えば内燃機関１０の吸気通路に設けられて吸気流量を絞る吸気絞り弁、内燃機関１０の排気通路１１に設けられて排気流量を絞る排気絞り弁、燃料噴射ポンプ等が挙げられる。不正運転防止手段３３は、デジタル方式又はアナログ方式の電気回路で構成されるのが一般的である。不正運転防止手段３３では、内燃機関１０の始動時又は始動後に圧力検出手段３１の出力と、予め設定されている設定値とを比較し、例えば圧力検出手段３１の出力が設定値を下回るなどして、フィルタ２１の排気上流側の排気圧力が設定値よりも低いと判断されたときには、出力性能関連手段３４の機能を抑制して内燃機関１０の出力性能を低下させる。出力性能関連手段３４の機能を抑制するには、例えば吸気絞り弁の開度をアクチュエータにより可変とし、このアクチュエータに電気信号を送って吸気絞り弁の開度を閉じ側に進め、吸気流量を絞ることで行う。排気絞り弁についても同様に構成し、排気絞り弁の開度を閉じ側に進め、排気流量を絞ることで行う。また、燃料噴射ポンプの噴射量をアクチュエータにより可変とし、このアクチュエータに電気信号を送って噴射量を低下させることで行ってもよい。このように圧力センサ等の出力に基づいて出力性能関連手段３４を制御することに代えて、圧力検出手段３１及び不正運転防止手段３３の機能を機械的構成で実現してもよい。その場合は例えば、シリンダに弁体を摺動可能に嵌挿し、弁体の一方にフィルタ２１の排気上流側の排気圧力を導入し、他方に上記排気圧力に抗して弁体を付勢する弾性部材を設け、上記排気圧力が弾性部材により設定される設定値よりも低くなったときは弁体が一方に移動してリミットスイッチ等を閉じ、これによって吸気絞り弁、排気絞り弁の開度を閉じ側に進めたり、燃料噴射ポンプの噴射量を低下させるなどして内燃機関１０の出力性能を低下させるように出力性能関連手段３４を制御する。
【００２８】
第２実施形態の不正運転防止装置３０は内燃機関１０の機能制限を、内燃機関１０の出力性能を低下させることで行った。このようにすれば、フィルタ２１の排気上流側の排気圧力が設定値よりも低いことを検出することで排気を正常なフィルタ２１に通さないままに内燃機関１０を運転する不正運転が行われていると推定し、内燃機関１０の出力性能を低下させるので、加速が悪化して運転性が劣悪になる、必要な出力を得ることができない、燃料消費率が悪化するなどの症状が出ることになり、そのまま不正運転を続行する意欲がなくなり、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００２９】
図４は第３実施形態の不正運転防止装置３０を示す。第１実施形態と異なるのは内燃機関１０の機能制限の内容であり、第１実施形態では内燃機関１０を始動不能にし若しくは停止させたが、第３実施形態では、その後の内燃機関１０の運転回数を制限するようにしている。すなわち、図４に示すように、不正運転防止装置３０は、フィルタ２１の排気上流側の排気圧力を検出する圧力検出手段３１と、内燃機関１０の運転回数をカウントする運転回数計測手段３５と、内燃機関１０の始動又は運転継続に係わる始動・運転継続関連手段３２と、圧力検出手段３１及び運転回数計測手段３５の出力を受け、内燃機関１０の始動時又は始動後にフィルタ２１の排気上流側の排気圧力が設定値よりも低くなると、その後の内燃機関１０の運転回数を制限するように始動・運転継続関連手段３２を制御する不正運転防止手段３３とを備えている。
【００３０】
圧力検出手段３１は、例えばフィルタ２１の排気上流側の排気通路１１に設けた公知の圧力センサである。始動・運転継続関連手段３２は、内燃機関１０の始動又は運転継続に欠くことができない機能を発揮する手段である。始動・運転継続関連手段３２としては、例えば内燃機関１０の電源スイッチ又はキースイッチ、セルモータ、燃料ポンプ、燃料噴射ポンプ等が挙げられ、冬季等ではグロープラグも挙げられる。不正運転防止手段３３及び運転回数計測手段３５は、デジタル方式又はアナログ方式の電気回路で構成されるのが一般的である。不正運転防止手段３３では、内燃機関１０の始動時又は始動後に圧力検出手段３１の出力と、予め設定されている設定値とを比較し、例えば圧力検出手段３１の出力が設定値を下回るなどして、フィルタ２１の排気上流側の排気圧力が設定値よりも低いと判断されたときには、その後の内燃機関１０の運転回数を制限する。すなわち、予め許容運転回数がＮ回と設定されているときは、その後の内燃機関１０の運転回数をＮ回まで許容し、（Ｎ＋１）回目に始動しようとし又は始動したときは、始動・運転継続関連手段３２の機能を停止して内燃機関１０を始動不能にし又は停止させる。その場合、残りの運転回数をディスプレイ等に表示して運転者等に知らせることが好ましい。Ｎ回の運転を許容したのは、例えば車両搭載の内燃機関１０の場合、フィルタ２１の排気上流側の排気圧力が設定値よりも低くなったあと、車両が車庫等の基地へ戻ることが必要であり、途中休みを入れて数回の内燃機関１０の停止及び始動が許容されるべきであると判断されることがあるからである。始動・運転継続関連手段３２の機能を停止させるには、例えば電磁スイッチ等により始動・運転継続関連手段３２への電力供給を断つ、始動・運転継続関連手段３２への動作信号をキャンセルする信号を送るなどの方法により行う。このように圧力センサ等の出力に基づいて始動・運転継続関連手段３２を制御することに代えて、圧力検出手段３１及び不正運転防止手段３３の機能を機械的構成で実現してもよい。その場合は例えば、シリンダに弁体を摺動可能に嵌挿し、弁体の一方にフィルタ２１の排気上流側の排気圧力を導入し、他方に上記排気圧力に抗して弁体を付勢する弾性部材を設け、上記排気圧力が弾性部材により設定される設定値よりも低くなったときは弁体が一方に移動してリミットスイッチ等を閉じ、これによって、その後の内燃機関１０の運転回数を制限する。
【００３１】
第３実施形態の不正運転防止装置３０は内燃機関１０の機能制限を、その後の内燃機関１０の運転回数を制限することで行った。このようにすれば、フィルタ２１の排気上流側の排気圧力が設定値よりも低いことを検出することで排気を正常なフィルタ２１に通さないままに内燃機関１０を運転する不正運転が行われていると推定し、その後の内燃機関１０の運転回数を制限するので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００３２】
第１実施形態ないし第３実施形態で説明した排気浄化装置２０は、停止再生方式によりフィルタ２１の再生を行った。これに対して図５に示した第４実施形態の排気浄化装置２０は、切り換え再生方式によりフィルタ２１を再生しており、フィルタ２１を２個並列に設け、片方のフィルタ２１が目詰まりしたら排気を他方のフィルタ２１に切り換え、その間に目詰まりしたフィルタ２１を再生させるようにしている。すなわち、排気通路１１が途中で二本に分岐し、それぞれの分岐排気通路１１ａに、内部が排気通路１１ａの一部を構成するケーシング及びフィルタ２１を設け、フィルタ２１の周囲、例えばフィルタ２１よりも上流側の分岐排気通路１１ａに再生手段２２を設けている。そして、二本の分岐排気通路１１ａが分岐するところに切り換え弁１１ｂが設けられている。通常、切り換え弁１１ｂにより排気を二本の分岐排気通路１１ａのうち一方に流し、その分岐排気通路１１ａのあるフィルタ２１で浮遊粒子状物質を捕集する。そして、そのフィルタ２１が目詰まりしたら切り換え弁１１ｂを切り換えて排気を他方のフィルタ２１に流し、その間に目詰まりしたフィルタ２１を対応する再生手段２２を作動させて再生させるようにしている。
【００３３】
この第４実施形態においても第１実施形態ないし第３実施形態の不正運転防止装置３０を採用することができ、これらの実施形態と同様の作用及び効果を得ることができる。その場合、圧力検出手段３１は、分岐排気通路１１ａにおいてフィルタ２１の排気上流側にそれぞれ設けられる。圧力検出手段３１は、少なくとも現に排気が通過する側の分岐排気通路１１ａに設けたものが排気圧力を検出可能な状態になっていること、つまりアクティブになっていることが必要である。
【００３４】
第１実施形態ないし第３実施形態で説明した排気浄化装置２０は、固定方式によりフィルタ２１を排気通路１１に取り付けている。これに対して図６に示した第５実施形態の排気浄化装置２０は脱着方式を採用しており、フィルタ２１を内燃機関１０の排気通路１１に脱着可能に設けている。すなわち、例えば内部が排気通路１１の一部を構成するケーシングを設け、このケーシングの一端を上流側の排気通路１１に接続し、他端を蓋で開け閉めできるようにし、蓋を開けたときにケーシングの内部にフィルタ２１を装着し又はケーシングの内部からフィルタ２１を取り外せるように構成した形態である。この脱着方式を採用したときは、フィルタ２１の再生は外部で行われるので、排気浄化装置２０に再生手段２２を設けないのが一般的である。
【００３５】
この第５実施形態においても第１実施形態ないし第３実施形態の不正運転防止装置３０を採用することができ、これらの実施形態と同様の作用及び効果を得ることができる。
【００３６】
第１実施形態ないし第３実施形態で説明した排気浄化装置２０は、フィルタ２１の周辺、例えば排気上流側の排気通路１１に再生手段２２を設けた。これに対して図７に示した第６実施形態の排気浄化装置２０では、再生手段を設けずにフィルタ２１の排気上流側の排気通路１１に酸化触媒４０を設け、連続再生方式の排気浄化装置２０としている。こうすれば酸化触媒４０により排気中の浮遊粒子状物質が酸化されてフィルタ２１に捕集された浮遊粒子状物質が連続的に除去される。
【００３７】
この第６実施形態においても第１実施形態ないし第３実施形態の不正運転防止装置３０を採用することができ、これらの実施形態と同様の作用及び効果を得ることができる。その場合、圧力検出手段３１は、フィルタ２１と酸化触媒４０との間の排気通路１１に設けてもよいし、酸化触媒４０よりも排気上流側の排気通路１１に設けてもよい。
【００３８】
第１実施形態ないし第３実施形態で説明した排気浄化装置２０は、フィルタ２１よりも排気上流側の排気通路１１が、内燃機関１０との接続口及びフィルタ２１との接続口を除いて閉鎖されていた。これに対して図８に示した第７実施形態の排気通路１１では、フィルタ２１よりも排気上流側の排気通路１１に、排気を大気開放する大気開放手段５１が設けられ、この大気開放手段５１が開閉手段５２により開閉可能とされている。この大気開放手段５１は一端が排気通路１１に連通し、他端が大気に開放された管又は排気通路１１を大気に開放する開口である。開閉手段５２はこの管又は開口を開閉する弁であり、手動操作又は排気圧力が所定値を超えたことを受けての自動作動により開閉する。開閉手段の他の例として大気開放手段５１を塞ぐキャップがある。このキャップを大気開放手段５１である管又は開口にねじ込むようにしてもよい。従って、第７実施形態における内燃機関１０の不正運転は、フィルタ２１をケーシングから取り外して内燃機関１０を運転すること、フィルタ２１が溶損又は破損したときにフィルタ２１を交換せずに内燃機関を運転すること、大気開放手段５１又はバイパス通路６１が開き放しになるよう開閉手段５２、６２を操作して内燃機関１０を運転することである。
【００３９】
この第７実施形態においても第１実施形態ないし第３実施形態の不正運転防止装置３０を採用することができ、これらの実施形態と同様の作用及び効果を得ることができる。その場合、圧力検出手段３１は、排気通路１１における大気開放手段５１に近い部位に設けることが検出感度を高める上で好ましい。
【００４０】
図９に示した第８実施形態の排気通路１１では、第７実施形態が大気開放手段５１を設けたことに代えて、バイパス通路を設けている。すなわち、第８実施形態の排気通路１１では、フィルタ２１よりも排気上流側の排気通路１１に、排気をフィルタ２１よりも排気下流側の排気通路１１にバイパスさせるバイパス通路６１が設けられ、このバイパス通路６１が開閉手段６２により開閉可能とされている。開閉手段６２はバイパス通路６１を開閉する弁であり、手動操作又は排気圧力が所定値を超えたことを受けての自動作動により開閉する。従って、第８実施形態における内燃機関１０の不正運転は、第７実施形態で説明した三態様である。
【００４１】
この第８実施形態においても第１実施形態ないし第３実施形態の不正運転防止装置３０を採用することができ、これらの実施形態と同様の作用及び効果を得ることができる。その場合、圧力検出手段３１は、排気通路１１におけるバイパス通路６１の上流端と接続する部位に設けることが検出感度を高める上で好ましい。
【００４２】
本発明は、以上の実施形態の特徴を組み合わせた実施形態を含む。そのなかで、第１実施形態ないし第６実施形態の不正運転防止装置３０は、フィルタ２１よりも排気上流側の排気通路１１が、内燃機関１０との接続口及びフィルタ２１との接続口を除いて閉鎖されている。そのため、不正運転防止手段３３により、内燃機関１０の始動時又は始動後にフィルタ２１の排気上流側の排気圧力が設定値よりも低いときは即座に内燃機関１０を始動不能にし若しくは停止させ、又は内燃機関１０の出力性能を低下させても問題になることが少ないと考えられ、そうしたときには不正運転の続行が直ちに有効に阻止され、排気ガス規制の実効が担保される。もっとも本発明は、第１実施形態ないし第６実施形態の不正運転防止装置３０において、内燃機関１０の始動時又は始動後にフィルタ２１の排気上流側の排気圧力が設定値よりも低いときは、その後の内燃機関１０の運転回数を制限するようにした実施形態を含んでいる。
【００４３】
一方、第７実施形態及び第８実施形態の不正運転防止装置３０は、フィルタ２１よりも排気上流側の排気通路１１に、排気を大気開放する大気開放手段５１、又は排気をフィルタ２１よりも排気下流側の排気通路１１にバイパスさせるバイパス通路６１が設けられ、この大気開放手段５１又はバイパス通路６１が開閉手段５２、６２により開閉可能とされている。これはフィルタ２１の目詰まり時に非常手段として排気を大気に放出することを想定して設けられた手段である。その設計趣旨を尊重するときには、不正運転防止手段３３により、内燃機関１０の始動時又は始動後にフィルタ２１の排気上流側の排気圧力が設定値よりも低いときは、即座に内燃機関１０を始動不能にし又は停止させるのではなく、その後の内燃機関１０の運転回数を制限することが好ましい。そうすれば、例えば走行中などのように内燃機関１０の稼働時にフィルタ２１が目詰まりしたときにフィルタ２１の再生又は交換を行える状態になるまでの間、大気開放手段５１又はバイパス通路６１を開くことを許容しながら、その後の内燃機関１０を始動不能にし又は停止させ、不正運転の続行が有効に阻止されて排気ガス規制の実効が担保される。その場合、許容される内燃機関１０の運転回数Ｎを例えば３回と想定することが考えられる。すなわち、車両搭載の内燃機関１０を例に挙げると、排気圧力の上昇等を知って内燃機関１０を停止して開閉手段５２、６２を開け、次いで内燃機関１０を始動し（１回目）、サービスエリアで休憩のために内燃機関１０を停止し休憩後に内燃機関１０を始動し（２回目）、車庫等の基地に戻って内燃機関１０を停止し、翌日などに内燃機関１０を始動して（３回目）サービス拠点へ移動する、という想定である。ただし、これは例示であるので、Ｎは３であると限定するものではなく、１、２又は４以上であってもよい。もっとも本発明は、第７実施形態及び第８実施形態の不正運転防止装置３０において、内燃機関１０の始動時又は始動後にフィルタ２１の排気上流側の排気圧力が設定値よりも低いときは即座に内燃機関１０を始動不能にし若しくは停止させ、又は内燃機関１０の出力性能を低下させるようにした実施形態を含んでいる。
【００４４】
本発明の不正運転防止装置は、不正運転の続行を防止する趣旨であるから、例えば圧力検出手段を破壊するなど不正運転防止装置を本来の機能を発揮できないように改造されると意味をなさない。そのため、このような改造が施されないように保護する機能を備えることが望まれる。それには改造が施されると警報が鳴るようにしたり、内燃機関が停止するようにすることが好ましい。
【００４５】
【発明の効果】
請求項１の内燃機関の不正運転防止装置を用いれば、フィルタの排気上流側の排気圧力が設定値よりも低いときは排気を正常なフィルタに通さないままに内燃機関を運転する不正運転が行われていると推定し、内燃機関の機能を制限するので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００４６】
請求項２のようにすれば、内燃機関を始動不能にし若しくは停止させること、内燃機関の出力性能を低下させること、又はその後の内燃機関の運転回数を制限することにより、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００４７】
請求項３の内燃機関の不正運転防止装置を用いれば、フィルタの排気上流側の排気圧力が設定値よりも低いことを検出することで排気を正常なフィルタに通さないままに内燃機関を運転する不正運転が行われていると推定し、内燃機関を始動不能にし又は停止させるので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００４８】
請求項４の内燃機関の不正運転防止装置を用いれば、フィルタの排気上流側の排気圧力が設定値よりも低いことを検出することで排気を正常なフィルタに通さないままに内燃機関を運転する不正運転が行われていると推定し、内燃機関の出力性能を低下させるので、不正運転の続行が困難となって有効に阻止され、排気ガス規制の実効が担保される。
【００４９】
請求項５の内燃機関の不正運転防止装置を用いれば、フィルタの排気上流側の排気圧力が設定値よりも低いことを検出することで排気を正常なフィルタに通さないままに内燃機関を運転する不正運転が行われていると推定し、その後の運転回数を制限するので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００５０】
請求項６の内燃機関の不正運転防止装置は、例えば大気開放手段又はバイパス通路などが設けられていない内燃機関を対象とするが、不正運転防止手段により、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは即座に内燃機関を始動不能にし若しくは停止させ、又は内燃機関の出力性能を低下させるので、不正運転の続行が有効に阻止され、排気ガス規制の実効が担保される。
【００５１】
請求項７の内燃機関の不正運転防止装置は、大気開放手段又はバイパス通路が設けられている内燃機関を対象とし、不正運転防止手段により、内燃機関の始動時又は始動後にフィルタの排気上流側の排気圧力が設定値よりも低いときは、即座に内燃機関を始動不能にし又は停止させるのではなく、その後の内燃機関の運転回数を制限する。そのため、フィルタが目詰まりしたときにフィルタの再生又は交換を行える状態になるまでの間、大気開放手段又はバイパス通路を開くことを許容しながら、その後の内燃機関を始動不能にし又は停止させ、不正運転の続行が有効に阻止されて排気ガス規制の実効が担保される。
【図面の簡単な説明】
【図１】第１実施形態の不正運転防止装置を示す一部断面図である。
【図２】第１実施形態の不正運転防止装置を示すブロック図である。
【図３】第２実施形態の不正運転防止装置を示すブロック図である。
【図４】第３実施形態の不正運転防止装置を示すブロック図である。
【図５】第４実施形態の不正運転防止装置を示す一部断面図である。
【図６】第５実施形態の不正運転防止装置を示す一部断面図である。
【図７】第６実施形態の不正運転防止装置を示す一部断面図である。
【図８】第７実施形態の不正運転防止装置を示す一部断面図である。
【図９】第８実施形態の不正運転防止装置を示す一部断面図である。
【符合の説明】
１０　内燃機関
１１　排気通路
２０　排気浄化装置
２１　フィルタ
３０　不正運転防止装置
３１　圧力検出手段
３２　始動・運転継続関連手段
３３　不正運転防止手段
３４　出力性能関連手段
３５　運転回数計測手段
５１　大気開放手段
５２　開閉手段
６１　バイパス通路
６２　開閉手段[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of exhaust gas purification for trapping suspended particulate matter contained in exhaust gas of an internal combustion engine such as a diesel engine, and relates to an internal combustion engine provided with a filter for trapping the suspended particulate matter in an exhaust passage. The present invention relates to a device for preventing unauthorized driving.
[0002]
[Prior art]
As an apparatus for purifying this type of exhaust gas, there is known an apparatus provided with a filter for trapping suspended particulate matter contained in exhaust gas in an exhaust passage of an internal combustion engine (for example, JP-A-2-185611, See JP-A-10-131740). In such an internal combustion engine, when the filter is clogged, the filter is regenerated by burning the suspended particulate matter collected by a burner or an electric heater. In this case, two filters are provided in parallel, and when one of the filters is clogged, the exhaust gas is switched to the other filter, and during that time, the switching regeneration type exhaust purification device is used to regenerate the clogged filter. There is an exhaust purification device of a stop regeneration system that stops an engine and regenerates a filter. Further, the filter can be removed from the exhaust passage assuming maintenance or inspection, replacement due to deterioration, or the like, but is not a daily removal. This is referred to as a fixed-type exhaust gas purification apparatus. On the other hand, there is known an exhaust gas purifying apparatus of a detachable type in which a filter is detachably provided in an exhaust passage of an internal combustion engine (for example, see Japanese Patent Application Laid-Open No. 8-35417). Further, there is known an exhaust gas purification apparatus in which an air release means for releasing the exhaust air to the atmosphere is provided in the exhaust passage on the exhaust gas upstream side of this type of filter, and the air release means can be opened and closed by the opening and closing means (for example, Japanese Patent Application Laid-Open No. H11-163873). See JP-A-2002-89235). In this case, a similar effect can be obtained by providing a bypass passage for bypassing the exhaust gas to the exhaust passage downstream of the filter, instead of the atmosphere opening means, and opening and closing the bypass passage by the opening / closing means.
[0003]
[Problems to be solved by the invention]
If a filter is provided in the exhaust passage, the exhaust resistance increases as the collection of suspended particulate matter progresses, so that the output performance of the internal combustion engine is reduced, drivability is reduced, and the fuel consumption rate is likely to be deteriorated. In the case of the stop regeneration method, the internal combustion engine cannot be operated during the filter regeneration, so that the degree of freedom in using the internal combustion engine is limited. In addition, regeneration of the filter requires energy for heating, and maintenance of the filter and the like is required, which increases the cost. Therefore, even if an exhaust gas purification device is provided in order to clear the exhaust gas regulations, it is expected that the filter will be removed and the internal combustion engine will be operated illegally. Further, if the filter is melted or damaged and a hole penetrating the filter is provided, the function of the filter to collect suspended particulate matter is impaired and the exhaust resistance is reduced. In that case, it is expected that the illegal operation of operating the internal combustion engine without replacing the filter will be performed. Furthermore, the atmosphere opening means is intended to be temporarily opened until the filter can be regenerated or replaced when the filter is clogged, and the bypass passage can be used as such. It is expected that the illegal operation of operating the internal combustion engine by operating the opening means or the bypass passage to be left open is expected. If such an illegal operation of the internal combustion engine is performed, exhaust gas purification will not proceed, and it will not be possible to ensure the effectiveness of exhaust gas regulations.
[0004]
The present invention has been made in view of such a point, the purpose thereof is, when the exhaust pressure on the exhaust upstream side of the filter becomes lower than a set value at or after the start of the internal combustion engine, By this, it is presumed that the illegal operation of operating the internal combustion engine without passing the exhaust gas through the normal filter is performed, so that the function of the internal combustion engine is limited, and the continuation of the illegal operation is effectively prevented, An object of the present invention is to provide a device for preventing illegal operation of an internal combustion engine that ensures the effectiveness of exhaust gas regulation.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, an unauthorized operation prevention device for an internal combustion engine according to claim 1 is an unauthorized operation prevention device for an internal combustion engine, provided with a filter for trapping suspended particulate matter contained in exhaust gas in an exhaust passage, When the exhaust pressure on the exhaust gas upstream side of the filter is lower than a set value at or after the start of the internal combustion engine, the function of the internal combustion engine is limited.
[0006]
Since the exhaust pressure on the exhaust upstream side of the filter is lower than the set value, it is estimated that the internal combustion engine is being operated without operating the exhaust gas through the normal filter, and the function of the internal combustion engine is limited. Therefore, the continuation of the illegal operation is effectively prevented, and the enforcement of the exhaust gas regulation is ensured.
[0007]
According to a second aspect of the present invention, in the configuration of the first aspect, the functional restriction of the internal combustion engine disables or stops the internal combustion engine, reduces the output performance of the internal combustion engine, or Is to limit the number of operations of the internal combustion engine.
[0008]
In this way, by detecting that the exhaust pressure on the exhaust gas upstream side of the filter is lower than the set value, it is estimated that the illegal operation of operating the internal combustion engine without passing the exhaust gas through the normal filter is performed. However, since the internal combustion engine cannot be started or stopped, the output performance of the internal combustion engine is reduced, or the number of operations of the internal combustion engine is limited thereafter, the continuation of the illegal operation is effectively prevented, and the exhaust gas regulation becomes effective. Secured. In this case, if the output performance of the internal combustion engine is reduced, the continuation of the illegal operation is effectively prevented from being prevented because the acceleration is deteriorated, the drivability is deteriorated, the required output cannot be obtained, and the fuel consumption rate is deteriorated. This is because there is no desire to continue illegal driving as it is due to symptoms such as doing.
[0009]
An apparatus for preventing illegal operation of an internal combustion engine according to claim 3 is an apparatus for preventing illegal operation of an internal combustion engine, wherein a filter for trapping suspended particulate matter contained in exhaust gas is provided in an exhaust passage, wherein exhaust gas on the exhaust upstream side of the filter is provided. Pressure detection means for detecting pressure, start-up / continuation-related means relating to starting or continuation of operation of the internal combustion engine, and exhaust pressure on the exhaust upstream side of the filter at the time of or after starting of the internal combustion engine, receiving the output of the pressure detection means When the value is lower than a set value, an illegal operation preventing means for controlling a start / operation continuation related means so as to disable or stop the internal combustion engine is provided.
[0010]
The illegal operation prevention means controls the start / operation continuation related means based on the output of the pressure detection means at the start of the internal combustion engine or after the start when the exhaust pressure on the exhaust gas upstream side of the filter is lower than a set value. Disable or stop the engine. By detecting that the exhaust pressure on the exhaust gas upstream side of the filter is lower than the set value in this way, it is estimated that the illegal operation of operating the internal combustion engine without passing the exhaust gas through the normal filter is performed, and Since the engine cannot be started or stopped, the continuation of the illegal operation is effectively prevented, and the enforcement of the exhaust gas regulation is ensured.
[0011]
An apparatus for preventing illegal operation of an internal combustion engine according to claim 4, wherein the apparatus is provided with a filter for trapping suspended particulate matter contained in exhaust gas in an exhaust passage, the exhaust gas being provided upstream of the filter. Pressure detection means for detecting pressure, output performance-related means relating to the output performance of the internal combustion engine, and the output of the pressure detection means, the exhaust pressure on the exhaust upstream side of the filter at the start of or after the start of the internal combustion engine exceeds the set value And when the engine power is low, an illegal operation preventing means for controlling the output performance related means so as to reduce the output performance of the internal combustion engine is provided.
[0012]
The illegal operation preventing means controls the output performance-related means based on the output of the pressure detecting means when the exhaust pressure on the exhaust upstream side of the filter is lower than a set value at or after the start of the internal combustion engine to start the internal combustion engine. Reduce output performance. By detecting that the exhaust pressure on the exhaust gas upstream side of the filter is lower than the set value in this way, it is estimated that the illegal operation of operating the internal combustion engine without passing the exhaust gas through the normal filter is performed, and Since the output performance of the engine is reduced, the acceleration will deteriorate, driving performance will deteriorate, the required output will not be obtained, the fuel consumption rate will deteriorate, etc. As a result, it becomes difficult to continue the illegal operation, and the operation is effectively prevented.
[0013]
An apparatus for preventing illegal operation of an internal combustion engine according to claim 5 is an apparatus for preventing illegal operation of an internal combustion engine, wherein a filter for trapping suspended particulate matter contained in exhaust gas is provided in an exhaust passage. Pressure detection means for detecting pressure, operation number measurement means for counting the number of operation times of the internal combustion engine, start / operation continuation related means for starting or continuation of operation of the internal combustion engine, and outputs of the pressure detection means and operation number measurement means When the exhaust pressure on the exhaust gas upstream side of the filter becomes lower than the set value at or after the start of the internal combustion engine, the illegal operation for controlling the start / operation continuation related means so as to limit the number of subsequent operations of the internal combustion engine is performed. And a prevention means.
[0014]
When the exhaust pressure on the upstream side of the exhaust gas of the filter is lower than a set value at or after the start of the internal combustion engine based on the outputs of the pressure detecting means and the number of operation times measuring means, the illegal operation preventing means means To limit the number of subsequent operations of the internal combustion engine. Thus, by detecting that the exhaust pressure on the exhaust upstream side of the filter is lower than the set value, it is estimated that the illegal operation of operating the internal combustion engine without passing the exhaust gas through the normal filter is performed, and thereafter, Therefore, the continuation of the illegal operation is effectively prevented, and the effective exhaust gas regulation is ensured.
[0015]
In the device for preventing unauthorized operation of an internal combustion engine according to claim 6, in the configuration of claim 1, claim 2, claim 3, or claim 4, the exhaust passage on the exhaust upstream side of the filter has a connection port with the internal combustion engine and Closed except for the connection port with the filter, and when the internal combustion engine is started or after startup, when the exhaust pressure on the exhaust side of the filter is lower than a set value, the internal combustion engine cannot be started or stopped, or Is configured to reduce the output performance.
[0016]
In the case where the air release means or the bypass passage is not provided as described above, the illegal operation preventing means is used to immediately start the internal combustion engine when the exhaust pressure on the exhaust side of the filter is lower than the set value at or after the start of the internal combustion engine. Since the engine cannot be started or stopped, or the output performance of the internal combustion engine is reduced, the continuation of the illegal operation is immediately and effectively prevented, and the exhaust gas regulation is ensured.
[0017]
An apparatus for preventing illegal operation of an internal combustion engine according to claim 7, in the configuration of claim 1, 2, or 5, is provided with an atmosphere opening means for opening the exhaust to the atmosphere in an exhaust passage upstream of the filter. A bypass passage for bypassing the filter to an exhaust passage on the exhaust downstream side of the filter is provided, and the atmosphere opening means or the bypass passage can be opened and closed by an opening and closing means. When the exhaust pressure of the internal combustion engine is lower than the set value, the number of operations of the internal combustion engine thereafter is limited.
[0018]
In the case where the atmosphere opening means or the bypass passage is provided as described above, the illegal operation prevention means immediately starts the internal combustion engine when the exhaust pressure on the exhaust upstream side of the filter is lower than the set value at or after the start of the internal combustion engine. Rather than disabling or stopping the engine, it limits the number of operations of the internal combustion engine thereafter, so that when the filter becomes clogged during operation of the internal combustion engine, until the filter can be regenerated or replaced. While allowing the opening of the atmosphere opening means or the bypass passage, the internal combustion engine thereafter cannot be started or stopped, and the continuation of the illegal operation is effectively prevented, so that the exhaust gas regulation is ensured.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. These unauthorized driving prevention devices may be provided in an internal combustion engine mounted on a transportation device such as an automobile, or may be provided in an internal combustion engine fixed on a site such as an internal combustion engine for driving a power generation device. The exhaust passages of these internal combustion engines are provided with filters for trapping suspended particulate matter contained in exhaust gas. FIG. 1 shows a first embodiment of an unauthorized driving prevention device. In FIG. 1, reference numeral 10 denotes an internal combustion engine such as a diesel engine, and 11 denotes an exhaust passage of the internal combustion engine 10, and an exhaust purification device 20 is provided in the exhaust passage 11. The exhaust gas purification device 20 includes a casing whose inside constitutes a part of the exhaust passage 11, and a filter 21 provided in the casing. The filter 21 can be removed from the casing assuming maintenance or inspection, replacement due to deterioration, etc., but it is not removed on a daily basis, and the exhaust purification device 20 is of a fixed type. The filter 21 emits exhaust gas entering from one end face through the other end face, and exhibits a function of collecting suspended particulate matter from the exhaust gas during this time. Examples of the filter 21 include a plug type, a porous type, and a fiber type. The plugging type is a so-called honeycomb body which is made of, for example, a material such as ceramics and has a plurality of cells partitioned by partition walls. Collects suspended particulate matter as it passes through walls. For example, at one end face, the end faces of the cells are alternately closed in a checkered pattern by a sealing material, and at the other end face, the cells closed at the one end face are open, and at the one end face, The open cell has a structure closed by a sealing material. The porous body type and the fiber type are made of, for example, a material such as a metal, and trap airborne particulate matter by exhaust gas colliding with a porous body or a fiber structure. However, the present invention does not limit the structure of the filter to these.
[0020]
The exhaust gas purification device 20 according to the first embodiment further includes a regeneration unit 22. The regeneration means 22 is provided around the filter 21, for example, in the exhaust passage 11 on the upstream side of the filter 21. When the filter 21 is clogged, the internal combustion engine 10 is stopped and the regeneration means 22 is operated. The filter 21 is regenerated by burning the suspended particulate matter collected in the filter 21. Therefore, the exhaust gas purifying apparatus 20 is of the stop regeneration method described above. Examples of the regenerating unit 22 include an electric heater that generates heat when energized, and a burner that generates heat by burning supplied fuel. Therefore, the illegal operation of the internal combustion engine 10 in the first embodiment is performed by removing the filter 21 from the casing and operating the internal combustion engine 10, or when the filter 21 is melted or damaged, without replacing the filter 21 without replacing the filter 21. It is to drive.
[0021]
Numeral 30 denotes a device for preventing illegal operation. This device 30 prevents the function of the internal combustion engine 10 when the exhaust pressure on the exhaust upstream side of the filter 21 is lower than a set value at or after the start of the internal combustion engine 10. It is configured to limit. Restricting the function of the internal combustion engine 10 refers to lowering or eliminating the function of the internal combustion engine 10 from the normal state. The function limitation of the internal combustion engine 10 includes disabling or stopping the internal combustion engine 10, reducing the output performance of the internal combustion engine 10, or limiting the number of operations of the internal combustion engine 10 thereafter. Of these, in the first embodiment, the internal combustion engine 10 is disabled or stopped.
[0022]
As shown in FIG. 2, the unauthorized operation prevention device 30 includes a pressure detection unit 31 for detecting an exhaust pressure on the exhaust gas upstream side of the filter 21 and a start / operation continuation related unit 32 for starting or continuing operation of the internal combustion engine 10. When the exhaust pressure on the exhaust upstream side of the filter 21 is lower than a set value at the start of the internal combustion engine 10 or after the start, the internal combustion engine 10 is started to be disabled or stopped. An unauthorized operation preventing means 33 for controlling the operation continuation related means 32;
[0023]
The pressure detecting means 31 is, for example, a known pressure sensor provided in the exhaust passage 11 on the exhaust upstream side of the filter 21. The start / operation continuation related means 32 is a means for exhibiting a function essential for starting or continuing the operation of the internal combustion engine 10. Examples of the startup / operation continuation related means 32 include a power switch or a key switch of the internal combustion engine 10, a starter motor, a fuel pump, a fuel injection pump, and the like, and a glow plug in winter and the like. The unauthorized operation preventing means 33 is generally constituted by a digital or analog electric circuit. The illegal operation prevention means 33 compares the output of the pressure detection means 31 with a preset set value at or after the start of the internal combustion engine 10 and, for example, determines that the output of the pressure detection means 31 falls below the set value. Then, when it is determined that the exhaust pressure on the exhaust upstream side of the filter 21 is lower than the set value, the function of the startup / operation continuation related means 32 is stopped to disable or stop the internal combustion engine 10. In order to stop the function of the start / operation continuation-related means 32, for example, the power supply to the start / operation continuation-related means 32 is cut off by an electromagnetic switch or the like, and a signal for canceling the operation signal to the start / operation continuation-related means 32 is issued. It is performed by a method such as sending. The set value is an exhaust pressure that will be generated on the exhaust upstream side of the filter 21 at the time of start or after the start if the normal filter 21 is present at a predetermined position in the exhaust passage 11. It is determined according to. Instead of controlling the startup / operation continuation related means 32 based on the output of the pressure sensor or the like, the functions of the pressure detection means 31 and the unauthorized operation prevention means 33 may be realized by a mechanical configuration. In such a case, for example, a valve element is slidably fitted into the cylinder, the exhaust pressure on the exhaust upstream side of the filter 21 is introduced into one of the valve elements, and the valve element is urged against the other against the exhaust pressure. An elastic member is provided, and when the exhaust pressure becomes lower than the set value set by the elastic member, the valve body moves to one side and closes a limit switch or the like, thereby disabling or stopping the internal combustion engine 10. The start / operation continuation related means 32 is controlled as described above.
[0024]
Therefore, in the first embodiment, since the exhaust pressure on the exhaust gas upstream side of the filter 21 is lower than the set value, the illegal operation of operating the internal combustion engine 10 without passing the exhaust gas through the normal filter 21 is performed. Since the function of the internal combustion engine 10 is estimated to be restricted, the continuation of the illegal operation is effectively prevented, and the effectiveness of the exhaust gas regulation is secured.
[0025]
The present invention includes all embodiments of the unauthorized operation prevention device configured to limit the function of the internal combustion engine when the exhaust pressure on the exhaust gas upstream side of the filter is lower than a set value at or after the start of the internal combustion engine. Among them, the unauthorized operation prevention device 30 of the first embodiment restricts the function of the internal combustion engine 10 by making the internal combustion engine 10 impossible to start or stop. In this way, the illegal operation of operating the internal combustion engine 10 without passing the exhaust gas through the normal filter 21 is performed by detecting that the exhaust pressure on the exhaust gas upstream side of the filter 21 is lower than the set value. Since it is estimated that the internal combustion engine 10 cannot be started or stopped, the continuation of the illegal operation is effectively prevented, and the effective exhaust gas regulation is ensured.
[0026]
Hereinafter, other embodiments will be described, but the description of the same configurations, operations, and effects as those of the first embodiment will be omitted, and only different configurations, operations, and effects will be described. FIG. 3 shows an unauthorized driving prevention device 30 according to the second embodiment. The difference from the first embodiment is the contents of the function limitation of the internal combustion engine 10. In the first embodiment, the internal combustion engine 10 is disabled or stopped, but in the second embodiment, the output performance of the internal combustion engine 10 is reduced. I try to make it. The reduction of the output performance is performed by, for example, reducing the flow rate of intake air supplied to the internal combustion engine 10, reducing the flow rate of exhaust gas discharged from the internal combustion engine 10, reducing the flow rate of fuel supplied to the internal combustion engine 10, and the like. That is, as shown in FIG. 3, the unauthorized operation prevention device 30 includes a pressure detection unit 31 that detects an exhaust pressure on the exhaust gas upstream side of the filter 21, an output performance related unit 34 related to an output performance of the internal combustion engine 10, When the output of the pressure detecting means 31 is received, and when the exhaust pressure on the exhaust upstream side of the filter 21 is lower than a set value at the start of the internal combustion engine 10 or after the start, the output performance related means so as to reduce the output performance of the internal combustion engine 10 And illegal operation preventing means 33 for controlling the operation of the vehicle.
[0027]
The pressure detecting means 31 is, for example, a known pressure sensor provided in the exhaust passage 11 on the exhaust upstream side of the filter 21. The output performance-related means 34 is a means for exhibiting a function that is indispensable for the internal combustion engine 10 to exhibit its original output performance. The output performance-related means 34 includes, for example, an intake throttle valve provided in the intake passage of the internal combustion engine 10 to reduce the intake flow rate, an exhaust throttle valve provided in the exhaust passage 11 of the internal combustion engine 10 to reduce the exhaust flow rate, a fuel injection pump, and the like. Is mentioned. The unauthorized operation preventing means 33 is generally constituted by a digital or analog electric circuit. The illegal operation prevention means 33 compares the output of the pressure detection means 31 with a preset set value at or after the start of the internal combustion engine 10 and, for example, determines that the output of the pressure detection means 31 falls below the set value. When it is determined that the exhaust pressure on the exhaust upstream side of the filter 21 is lower than the set value, the function of the output performance-related means 34 is suppressed to lower the output performance of the internal combustion engine 10. In order to suppress the function of the output performance-related means 34, for example, the opening degree of the intake throttle valve is made variable by an actuator, and an electric signal is sent to this actuator to advance the opening degree of the intake throttle valve to the closing side to reduce the intake flow rate. Do it by doing. The exhaust throttle valve is configured in the same manner, and the opening degree of the exhaust throttle valve is advanced to the closed side to reduce the exhaust flow rate. Alternatively, the injection amount of the fuel injection pump may be made variable by an actuator, and an electric signal may be sent to the actuator to reduce the injection amount. Instead of controlling the output performance-related means 34 based on the output of the pressure sensor or the like, the functions of the pressure detection means 31 and the unauthorized operation prevention means 33 may be realized by a mechanical configuration. In such a case, for example, a valve element is slidably fitted into the cylinder, the exhaust pressure on the exhaust upstream side of the filter 21 is introduced into one of the valve elements, and the valve element is urged against the other against the exhaust pressure. An elastic member is provided, and when the exhaust pressure becomes lower than a set value set by the elastic member, the valve body moves to one side to close a limit switch and the like, thereby opening the intake throttle valve and the exhaust throttle valve. The output performance-related means 34 is controlled so that the output performance of the internal combustion engine 10 is reduced by, for example, advancing to the closing side or reducing the injection amount of the fuel injection pump.
[0028]
The unauthorized operation prevention device 30 of the second embodiment restricts the functions of the internal combustion engine 10 by lowering the output performance of the internal combustion engine 10. In this way, the illegal operation of operating the internal combustion engine 10 without passing the exhaust gas through the normal filter 21 is performed by detecting that the exhaust pressure on the exhaust gas upstream side of the filter 21 is lower than the set value. And the output performance of the internal combustion engine 10 is reduced, so that the acceleration becomes worse, the drivability becomes worse, the required output cannot be obtained, and the fuel consumption rate becomes worse. In other words, the motivation to continue the illegal operation as it is disappears, the continuation of the illegal operation is effectively prevented, and the effective emission gas regulation is secured.
[0029]
FIG. 4 shows an unauthorized driving prevention device 30 according to the third embodiment. What differs from the first embodiment is the contents of the function limitation of the internal combustion engine 10. In the first embodiment, the internal combustion engine 10 is disabled or stopped, but in the third embodiment, the operation of the internal I try to limit the number of times. That is, as shown in FIG. 4, the unauthorized operation prevention device 30 includes a pressure detection unit 31 that detects the exhaust pressure on the exhaust upstream side of the filter 21, an operation number measurement unit 35 that counts the number of operation of the internal combustion engine 10, The output of the start / operation continuation related means 32 relating to the start or continuation of the operation of the internal combustion engine 10, the output of the pressure detection means 31 and the number of operation times measurement means 35, and the exhaust upstream side of the filter 21 at or after the start of the internal combustion engine 10. When the exhaust pressure becomes lower than the set value, an improper operation preventing means 33 for controlling the start / operation continuation related means 32 so as to limit the number of subsequent operations of the internal combustion engine 10 is provided.
[0030]
The pressure detecting means 31 is, for example, a known pressure sensor provided in the exhaust passage 11 on the exhaust upstream side of the filter 21. The start / operation continuation related means 32 is a means for exhibiting a function essential for starting or continuing the operation of the internal combustion engine 10. Examples of the startup / operation continuation related means 32 include a power switch or a key switch of the internal combustion engine 10, a starter motor, a fuel pump, a fuel injection pump, and the like, and a glow plug in winter and the like. Generally, the illegal operation preventing means 33 and the number-of-operations measuring means 35 are constituted by digital or analog electric circuits. The illegal operation prevention means 33 compares the output of the pressure detection means 31 with a preset set value at or after the start of the internal combustion engine 10 and, for example, determines that the output of the pressure detection means 31 falls below the set value. Then, when it is determined that the exhaust pressure on the exhaust upstream side of the filter 21 is lower than the set value, the number of operations of the internal combustion engine 10 thereafter is limited. That is, when the allowable number of operations is set to N in advance, the number of operations of the internal combustion engine 10 thereafter is permitted up to N times. The function of the related means 32 is stopped to disable or stop the internal combustion engine 10. In this case, it is preferable to display the remaining number of operations on a display or the like to notify the driver or the like. The N times of operation is permitted, for example, in the case of the internal combustion engine 10 mounted on a vehicle, after the exhaust pressure on the exhaust upstream side of the filter 21 becomes lower than a set value, the vehicle needs to return to a base such as a garage. This is because it may be determined that stop and start of the internal combustion engine 10 several times with a break on the way should be allowed. In order to stop the function of the start / operation continuation-related means 32, for example, the power supply to the start / operation continuation-related means 32 is cut off by an electromagnetic switch or the like, and a signal for canceling the operation signal to the start / operation continuation-related means 32 is issued. It is performed by a method such as sending. Instead of controlling the startup / operation continuation related means 32 based on the output of the pressure sensor or the like, the functions of the pressure detection means 31 and the unauthorized operation prevention means 33 may be realized by a mechanical configuration. In such a case, for example, a valve element is slidably fitted into the cylinder, the exhaust pressure on the exhaust upstream side of the filter 21 is introduced into one of the valve elements, and the valve element is urged against the other against the exhaust pressure. An elastic member is provided, and when the exhaust pressure becomes lower than the set value set by the elastic member, the valve body moves to one side and closes a limit switch or the like, thereby reducing the number of operations of the internal combustion engine 10 thereafter. Restrict.
[0031]
The unauthorized operation prevention device 30 of the third embodiment restricts the functions of the internal combustion engine 10 by restricting the number of operations of the internal combustion engine 10 thereafter. In this way, the illegal operation of operating the internal combustion engine 10 without passing the exhaust gas through the normal filter 21 is performed by detecting that the exhaust pressure on the exhaust gas upstream side of the filter 21 is lower than the set value. It is presumed that the engine is operating and the number of operations of the internal combustion engine 10 thereafter is limited, so that the continuation of the illegal operation is effectively prevented, and the effectiveness of the exhaust gas regulation is ensured.
[0032]
The exhaust gas purifying apparatus 20 described in the first to third embodiments regenerates the filter 21 by the stop regeneration method. On the other hand, the exhaust gas purifying apparatus 20 of the fourth embodiment shown in FIG. 5 regenerates the filters 21 by the switching regeneration method. Two filters 21 are provided in parallel, and if one of the filters 21 is clogged, the exhaust gas is exhausted. Is switched to the other filter 21, and the clogged filter 21 is regenerated during that time. That is, the exhaust passage 11 is branched into two parts in the middle, and a casing and a filter 21 are provided in each of the branched exhaust passages 11a so that the inside constitutes a part of the exhaust passage 11a. The regeneration means 22 is provided in the upstream branch exhaust passage 11a. A switching valve 11b is provided at a location where the two branch exhaust passages 11a branch. Normally, exhaust gas is caused to flow to one of the two branch exhaust passages 11a by the switching valve 11b, and the filter 21 having the branch exhaust passage 11a collects suspended particulate matter. When the filter 21 is clogged, the switching valve 11b is switched to flow exhaust gas to the other filter 21, and the clogged filter 21 is regenerated by operating the corresponding regenerating means 22 during that time.
[0033]
Also in the fourth embodiment, the unauthorized driving prevention device 30 of the first to third embodiments can be adopted, and the same operation and effect as those of the embodiments can be obtained. In this case, the pressure detecting means 31 is provided on the exhaust gas upstream side of the filter 21 in the branch exhaust passage 11a. It is necessary that the pressure detecting means 31 be at least one that is provided in the branch exhaust passage 11a on the side where the exhaust actually passes, in a state capable of detecting the exhaust pressure, that is, it is active.
[0034]
In the exhaust gas purifying apparatus 20 described in the first to third embodiments, the filter 21 is attached to the exhaust passage 11 by a fixed method. On the other hand, the exhaust gas purifying apparatus 20 of the fifth embodiment shown in FIG. 6 employs a desorption method, and a filter 21 is provided in the exhaust passage 11 of the internal combustion engine 10 so as to be detachable. That is, for example, a casing whose inside constitutes a part of the exhaust passage 11 is provided, one end of the casing is connected to the exhaust passage 11 on the upstream side, and the other end can be opened and closed with a lid. In this embodiment, the filter 21 is mounted inside the casing or the filter 21 can be removed from the inside of the casing. When the desorption method is adopted, the regeneration of the filter 21 is performed externally, and therefore, it is general that the exhaust purification device 20 is not provided with the regeneration means 22.
[0035]
Also in the fifth embodiment, the unauthorized operation prevention device 30 of the first to third embodiments can be employed, and the same operation and effect as those of the fifth embodiment can be obtained.
[0036]
In the exhaust gas purifying apparatus 20 described in the first to third embodiments, the regenerating unit 22 is provided around the filter 21, for example, in the exhaust passage 11 on the exhaust upstream side. On the other hand, in the exhaust purification device 20 of the sixth embodiment shown in FIG. 7, the oxidation catalyst 40 is provided in the exhaust passage 11 on the exhaust upstream side of the filter 21 without providing the regeneration means, and the exhaust purification device of the continuous regeneration system is provided. 20. In this way, the suspended particulate matter in the exhaust gas is oxidized by the oxidation catalyst 40, and the suspended particulate matter collected by the filter 21 is continuously removed.
[0037]
Also in the sixth embodiment, the unauthorized driving prevention device 30 of the first to third embodiments can be adopted, and the same operation and effect as those of the embodiments can be obtained. In that case, the pressure detecting means 31 may be provided in the exhaust passage 11 between the filter 21 and the oxidation catalyst 40, or may be provided in the exhaust passage 11 on the exhaust upstream side of the oxidation catalyst 40.
[0038]
In the exhaust purification device 20 described in the first to third embodiments, the exhaust passage 11 on the exhaust upstream side of the filter 21 is closed except for the connection port with the internal combustion engine 10 and the connection port with the filter 21. I was On the other hand, in the exhaust passage 11 of the seventh embodiment shown in FIG. 8, an atmosphere opening means 51 for opening the exhaust to the atmosphere is provided in the exhaust passage 11 upstream of the filter 21. Can be opened and closed by opening and closing means 52. One end of the atmosphere opening means 51 communicates with the exhaust passage 11, and the other end is a tube or an opening which opens the exhaust passage 11 to the atmosphere. The opening / closing means 52 is a valve for opening / closing the pipe or opening, and is opened / closed manually or automatically when the exhaust pressure exceeds a predetermined value. As another example of the opening / closing means, there is a cap for closing the atmosphere opening means 51. This cap may be screwed into a tube or opening serving as the atmosphere opening means 51. Therefore, the illegal operation of the internal combustion engine 10 according to the seventh embodiment is to operate the internal combustion engine 10 by removing the filter 21 from the casing, and to operate the internal combustion engine without replacing the filter 21 when the filter 21 is melted or damaged. The operation is to operate the internal combustion engine 10 by operating the opening and closing means 52 and 62 so that the atmosphere opening means 51 or the bypass passage 61 is left open.
[0039]
Also in the seventh embodiment, the unauthorized driving prevention device 30 of the first to third embodiments can be employed, and the same operation and effect as those of the embodiments can be obtained. In that case, it is preferable to provide the pressure detecting means 31 at a position near the atmosphere opening means 51 in the exhaust passage 11 in order to enhance detection sensitivity.
[0040]
In the exhaust passage 11 of the eighth embodiment shown in FIG. 9, a bypass passage is provided instead of providing the atmosphere opening means 51 in the seventh embodiment. That is, in the exhaust passage 11 of the eighth embodiment, a bypass passage 61 for bypassing exhaust gas to the exhaust passage 11 downstream of the filter 21 is provided in the exhaust passage 11 upstream of the filter 21. The passage 61 can be opened and closed by opening and closing means 62. The opening / closing means 62 is a valve for opening / closing the bypass passage 61, and is opened / closed by manual operation or automatically operated when the exhaust pressure exceeds a predetermined value. Therefore, the illegal operation of the internal combustion engine 10 in the eighth embodiment is the three modes described in the seventh embodiment.
[0041]
Also in the eighth embodiment, the unauthorized driving prevention device 30 of the first to third embodiments can be adopted, and the same operation and effect as those of the embodiments can be obtained. In that case, it is preferable to provide the pressure detecting means 31 at a portion of the exhaust passage 11 that is connected to the upstream end of the bypass passage 61 in order to enhance detection sensitivity.
[0042]
The present invention includes embodiments that combine the features of the above embodiments. Among them, in the unauthorized operation prevention device 30 of the first to sixth embodiments, the exhaust passage 11 on the exhaust upstream side of the filter 21 excludes the connection port with the internal combustion engine 10 and the connection port with the filter 21. Closed. Therefore, the illegal operation preventing means 33 immediately disables or stops the internal combustion engine 10 when the exhaust pressure on the exhaust gas upstream side of the filter 21 is lower than the set value at the start of the internal combustion engine 10 or after the start, or It is considered that there is little problem even if the output performance of the engine 10 is lowered, and in such a case, the continuation of the illegal operation is immediately and effectively prevented, and the effectiveness of the exhaust gas regulation is ensured. However, the present invention relates to the unauthorized operation prevention device 30 of the first to sixth embodiments, when the exhaust pressure on the exhaust upstream side of the filter 21 is lower than the set value at the start of the internal combustion engine 10 or after the start, This embodiment includes an embodiment in which the number of operations of the internal combustion engine 10 is limited.
[0043]
On the other hand, the unauthorized operation prevention device 30 according to the seventh and eighth embodiments includes an atmosphere opening means 51 for opening the exhaust to the exhaust passage 11 on the exhaust upstream side of the filter 21 or an exhaust for discharging the exhaust from the filter 21. A bypass passage 61 for bypassing the exhaust passage 11 on the downstream side is provided, and the atmosphere opening means 51 or the bypass passage 61 can be opened and closed by opening and closing means 52 and 62. This is a means provided on the assumption that the exhaust gas is released to the atmosphere as an emergency means when the filter 21 is clogged. When the design purpose is respected, the illegal operation preventing means 33 makes it impossible to immediately start the internal combustion engine 10 when the exhaust pressure on the exhaust upstream side of the filter 21 is lower than a set value at the time of or after the internal combustion engine 10 is started. It is preferable to limit the number of subsequent operations of the internal combustion engine 10 instead of stopping or stopping. Then, when the filter 21 is clogged during operation of the internal combustion engine 10 such as during running, the air release means 51 or the bypass passage 61 is opened until the filter 21 can be regenerated or replaced. Then, the internal combustion engine 10 is disabled or stopped thereafter, the continuation of the illegal operation is effectively prevented, and the effective exhaust gas regulation is ensured. In that case, it is conceivable that the allowable number N of operations of the internal combustion engine 10 is assumed to be, for example, three. That is, taking the internal combustion engine 10 mounted on the vehicle as an example, the internal combustion engine 10 is stopped upon opening of the opening / closing means 52 and 62 upon knowing a rise in exhaust pressure or the like, and then the internal combustion engine 10 is started (first time) and the service is started. Stop the internal combustion engine 10 for a break in the area, start the internal combustion engine 10 after the break (second time), return to a base such as a garage, stop the internal combustion engine 10, and start the internal combustion engine 10 the next day ( Third) It is assumed that the user moves to a service base. However, since this is an example, N is not limited to 3, and may be 1, 2 or 4 or more. However, the present invention provides the improper operation prevention device 30 according to the seventh and eighth embodiments, in which the exhaust pressure on the exhaust upstream side of the filter 21 is lower than the set value at the start of the internal combustion engine 10 or after the start thereof. It includes an embodiment in which the internal combustion engine 10 is disabled or stopped, or the output performance of the internal combustion engine 10 is reduced.
[0044]
Since the unauthorized operation prevention device of the present invention is intended to prevent the continuation of unauthorized operation, it does not make sense if the unauthorized operation prevention device is modified so as not to exhibit its original function, for example, by destroying the pressure detecting means. . Therefore, it is desired to have a function of protecting such modification from being performed. To this end, it is preferable to make an alarm sound when the modification is performed or to stop the internal combustion engine.
[0045]
【The invention's effect】
According to the first aspect of the present invention, when the exhaust pressure on the exhaust gas upstream side of the filter is lower than the set value, the illegal operation of operating the internal combustion engine without passing the exhaust gas through the normal filter is performed. Since it is assumed that the internal combustion engine is functioning, the continuation of the illegal operation is effectively prevented, and the effectiveness of the exhaust gas regulation is ensured.
[0046]
According to the second aspect of the present invention, the continuation of the illegal operation is effective by making the internal combustion engine inoperable or stopping, reducing the output performance of the internal combustion engine, or limiting the number of times of operation of the internal combustion engine thereafter. And the effectiveness of exhaust gas regulations is ensured.
[0047]
According to the third aspect of the present invention, the internal combustion engine is operated without passing the exhaust gas through the normal filter by detecting that the exhaust pressure on the exhaust gas upstream side of the filter is lower than the set value. Since it is presumed that the illegal operation is being performed, and the internal combustion engine is disabled or stopped, the continuation of the illegal operation is effectively prevented, and the effective exhaust gas regulation is ensured.
[0048]
With the device for preventing illegal operation of an internal combustion engine according to claim 4, the internal combustion engine is operated without passing the exhaust gas through a normal filter by detecting that the exhaust pressure on the exhaust gas upstream side of the filter is lower than a set value. Since it is estimated that the illegal operation is being performed and the output performance of the internal combustion engine is reduced, the continuation of the illegal operation becomes difficult and is effectively prevented, so that the exhaust gas regulation is effectively enforced.
[0049]
According to the fifth aspect of the present invention, the internal combustion engine is operated without passing the exhaust gas through the normal filter by detecting that the exhaust pressure on the exhaust gas upstream side of the filter is lower than the set value. Since it is estimated that the illegal operation has been performed and the number of subsequent operations is limited, the continuation of the illegal operation is effectively prevented, and the effective emission gas regulation is secured.
[0050]
The device for preventing unauthorized operation of an internal combustion engine according to claim 6 is intended for an internal combustion engine which is not provided with, for example, an atmosphere opening means or a bypass passage. When the exhaust pressure on the exhaust upstream side is lower than the set value, the engine cannot be started or stopped immediately or the output performance of the internal combustion engine is reduced. Is ensured.
[0051]
The device for preventing unauthorized operation of an internal combustion engine according to claim 7 is intended for an internal combustion engine provided with an atmosphere opening means or a bypass passage. When the exhaust pressure is lower than the set value, the number of operations of the internal combustion engine is limited instead of immediately disabling or stopping the internal combustion engine. Therefore, until the filter can be regenerated or replaced when the filter is clogged, the air opening means or the bypass passage is allowed to be opened, and the subsequent internal combustion engine is disabled or stopped, and the The continuation of the operation is effectively prevented, and the effectiveness of the exhaust gas regulation is ensured.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view illustrating an unauthorized operation prevention device according to a first embodiment.
FIG. 2 is a block diagram showing an unauthorized driving prevention device according to the first embodiment.
FIG. 3 is a block diagram showing an unauthorized driving prevention device according to a second embodiment.
FIG. 4 is a block diagram showing an unauthorized driving prevention device according to a third embodiment.
FIG. 5 is a partial cross-sectional view illustrating an unauthorized operation prevention device according to a fourth embodiment.
FIG. 6 is a partial cross-sectional view showing an unauthorized operation prevention device according to a fifth embodiment.
FIG. 7 is a partial cross-sectional view illustrating an unauthorized operation prevention device according to a sixth embodiment.
FIG. 8 is a partial cross-sectional view illustrating an unauthorized operation prevention device according to a seventh embodiment.
FIG. 9 is a partial cross-sectional view illustrating an unauthorized operation prevention device according to an eighth embodiment.
[Description of sign]
10 Internal combustion engine
11 Exhaust passage
20 Exhaust gas purification device
21 Filter
30 Unauthorized driving prevention device
31 Pressure detecting means
32 Startup and operation continuation related means
33 Illegal driving prevention means
34 Output performance related means
35 Driving frequency measuring means
51 Air release means
52 Opening / closing means
61 Bypass passage
62 Opening / closing means

Claims

An illegal operation prevention device for an internal combustion engine, wherein a filter for trapping suspended particulate matter contained in exhaust gas is provided in an exhaust passage,
An apparatus for preventing improper operation of an internal combustion engine, wherein the function of the internal combustion engine is restricted when the exhaust pressure on the exhaust gas upstream side of the filter is lower than a set value at or after the start of the internal combustion engine.

2. The illegal operation of the internal combustion engine according to claim 1, wherein the restriction on the function of the internal combustion engine is to disable or stop the internal combustion engine, to reduce the output performance of the internal combustion engine, or to limit the number of times the internal combustion engine is operated thereafter. Driving prevention device.

An illegal operation prevention device for an internal combustion engine, wherein a filter for trapping suspended particulate matter contained in exhaust gas is provided in an exhaust passage,
Pressure detection means for detecting the exhaust pressure on the exhaust gas upstream side of the filter, start / operation continuation related means for starting or continuation of operation of the internal combustion engine, and a filter for receiving the output of the pressure detection means and starting or after starting the internal combustion engine. An internal combustion engine characterized in that the internal combustion engine is provided with illegal operation prevention means for controlling start / operation continuation related means so that the internal combustion engine cannot be started or stopped when the exhaust pressure on the exhaust upstream side of the exhaust gas is lower than a set value. Unauthorized driving prevention device.

An illegal operation prevention device for an internal combustion engine, wherein a filter for trapping suspended particulate matter contained in exhaust gas is provided in an exhaust passage,
Pressure detection means for detecting the exhaust pressure on the exhaust upstream side of the filter; output performance-related means relating to the output performance of the internal combustion engine; receiving the output of the pressure detection means, and starting or after starting the internal combustion engine on the exhaust upstream side of the filter. An unauthorized operation prevention means for controlling an output performance-related means so as to reduce the output performance of the internal combustion engine when the exhaust pressure of the internal combustion engine is lower than a set value.

An illegal operation prevention device for an internal combustion engine, wherein a filter for trapping suspended particulate matter contained in exhaust gas is provided in an exhaust passage,
Pressure detection means for detecting the exhaust pressure on the exhaust gas upstream side of the filter, operation number measurement means for counting the number of operation times of the internal combustion engine, start / operation continuation related means for starting or continuation of operation of the internal combustion engine, and pressure detection means When the exhaust pressure on the exhaust upstream side of the filter becomes lower than the set value at the start of the internal combustion engine or after the start of operation, the start and operation are continued so as to limit the number of operations of the internal combustion engine thereafter. An illegal operation prevention device for an internal combustion engine, comprising: illegal operation prevention means for controlling related means.

The exhaust passage upstream of the filter is closed except for the connection port with the internal combustion engine and the connection port with the filter. When the internal combustion engine is started or after the start, the exhaust pressure upstream of the filter is set to the set value. The illegal operation of the internal combustion engine according to any one of claims 1, 2, 3, and 4, wherein when the pressure is lower than the predetermined value, the internal combustion engine cannot be started or stopped, or the output performance of the internal combustion engine is reduced. Driving prevention device.

Atmospheric release means for releasing exhaust gas to the atmosphere, or a bypass passage for bypassing exhaust gas to an exhaust passage downstream of the filter, are provided in an exhaust passage upstream of the filter. When the exhaust pressure on the exhaust upstream side of the filter is lower than a set value at or after the start of the internal combustion engine, the number of operations of the internal combustion engine is limited thereafter. The illegal operation prevention device for an internal combustion engine according to claim 1, 2 or 5.