JP2011208571A - Exhaust emission treatment device for diesel engine - Google Patents
Exhaust emission treatment device for diesel engine Download PDFInfo
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本発明は、ディーゼルエンジンの排気処理装置に関し、詳しくは、ＤＰＦの再生効率を高めることができるディーゼルエンジンの排気処理装置に関する。この明細書及び特許請求の範囲で、ＤＯＣはディーゼル酸化触媒、ＤＰＦはディーゼル・パティキュレート・フィルタ、ＰＭは排気中の粒子状物質を意味する。 The present invention relates to an exhaust treatment device for a diesel engine, and more particularly to an exhaust treatment device for a diesel engine that can increase the regeneration efficiency of a DPF. In this specification and claims, DOC means a diesel oxidation catalyst, DPF means a diesel particulate filter, and PM means particulate matter in exhaust gas.
従来、ディーゼルエンジンの排気処理装置として、ＤＰＦケースの排気上流側にＤＯＣを収容し、排気下流側にＤＰＦを収容したものがある(例えば、特許文献１参照)。
この種の排気処理装置によれば、ＤＰＦでＰＭを捕捉し、ＰＭがある程度堆積すると、燃焼室へのポスト噴射や排気管への燃料噴射等により排気に燃料を混入させ、この燃料をＤＯＣで酸化燃焼させることにより、排気の温度を上昇させ、排気の熱により、ＰＭを焼却除去して、ＤＰＦを再生することができる利点がある。
しかし、この従来技術では、ＤＯＣとＤＰＦとの間に形成される排気受け渡し空間の周壁をＤＰＦ入口側連結部で分離可能に連結しているため、問題がある。
ＤＰＦ入口側連結部を設けるのは、ＤＰＦケースのＤＰＦ入口側開口部を開口し、ＤＰＦをＤＰＦケースに収容したまま、ＤＰＦケースのＤＰＦ入口側開口部から洗浄流体を吸引し、或いは、ＤＰＦケースの排気下流側から洗浄流体を圧送することにより、排気とは逆向きに洗浄流体をＤＰＦに通過させ、ＤＰＦの上流側表面に堆積したアッシュを分離させ、ＤＰＦケースのＤＰＦ入口側開口部から放出するためである。
Conventionally, as an exhaust treatment device for a diesel engine, there is one in which DOC is accommodated on the exhaust upstream side of the DPF case and DPF is accommodated on the exhaust downstream side (see, for example, Patent Document 1).
According to this type of exhaust treatment device, when PM is captured by the DPF and PM accumulates to some extent, fuel is mixed into the exhaust by post injection into the combustion chamber, fuel injection into the exhaust pipe, etc. By oxidizing and burning, there is an advantage that the temperature of the exhaust can be raised and PM can be incinerated and removed by the heat of the exhaust to regenerate the DPF.
However, this conventional technique has a problem because the peripheral wall of the exhaust delivery space formed between the DOC and the DPF is detachably connected at the DPF inlet side connecting portion.
The DPF inlet side connecting portion is provided by opening the DPF inlet side opening of the DPF case and sucking the cleaning fluid from the DPF inlet side opening of the DPF case while the DPF is accommodated in the DPF case. By pumping the cleaning fluid from the exhaust downstream side, the cleaning fluid is passed through the DPF in the opposite direction to the exhaust, and the ash accumulated on the upstream surface of the DPF is separated and released from the DPF inlet opening of the DPF case It is to do.
《問題》 ＤＰＦの再生効率が低い。
ＤＯＣとＤＰＦとの間に形成される排気受け渡し空間の周壁をＤＰＦ入口側連結部で分離可能に連結しているため、排気受け渡し空間の周壁に沿って断熱材を配置することができず、ＤＯＣで昇温させた排気の熱が排気受け渡し空間の周壁から放熱され、排気温度が低下し、ＤＰＦの再生効率が低い。
<< Problem >> DPF regeneration efficiency is low.
Since the peripheral wall of the exhaust delivery space formed between the DOC and the DPF is detachably connected at the DPF inlet side connecting portion, the heat insulating material cannot be disposed along the peripheral wall of the exhaust delivery space, and the DOC The heat of the exhaust gas raised in temperature is radiated from the peripheral wall of the exhaust delivery space, the exhaust gas temperature is lowered, and the regeneration efficiency of the DPF is low.
本発明の課題は、ＤＰＦの再生効率を高めることができるディーゼルエンジンの排気処理装置を提供することにある。 The subject of this invention is providing the exhaust-gas-treatment apparatus of the diesel engine which can improve the regeneration efficiency of DPF.
(請求項１に係る発明)
請求項１に係る発明の発明特定事項は、次の通りである。
図１に例示するように、ＤＰＦケース(１)の排気上流側にＤＯＣ(２)を収容し、排気下流側にＤＰＦ(３)を収容したディーゼルエンジンの排気処理装置において、
ＤＰＦケース(１)の排気上流端開口部(５)に蓋(４)を取り外し可能に取り付け、この蓋(４)を取り外すことにより、ＤＯＣ(２)の排気上流側に位置するＤＰＦケース(１)の排気上流端開口部(５)を開口できるようにし、
図１、図２に例示するように、ＤＯＣ(２)とＤＰＦ(３)との間に形成される排気受け渡し空間(６)の周壁(６ａ)に沿って断熱材(７)を配置した、ことを特徴とするディーゼルエンジンの排気処理装置。
(Invention of Claim 1)
Invention specific matters of the invention according to
As illustrated in FIG. 1, in an exhaust treatment device for a diesel engine in which a DOC (2) is accommodated on the exhaust upstream side of the DPF case (1) and a DPF (3) is accommodated on the exhaust downstream side,
The lid (4) is detachably attached to the exhaust upstream end opening (5) of the DPF case (1), and the DPF case (1) located on the exhaust upstream side of the DOC (2) is removed by removing the lid (4). ) Exhaust upstream end opening (5) can be opened,
As illustrated in FIGS. 1 and 2, the heat insulating material (7) is disposed along the peripheral wall (6 a) of the exhaust delivery space (6) formed between the DOC (2) and the DPF (3). An exhaust treatment device for a diesel engine characterized by the above.
(請求項２に係る発明)
請求項２に係る発明の発明特定事項は、次の通りである。
図３に例示するように、ＤＰＦケース(１)の排気上流側にＤＯＣ(２)を収容し、排気下流側にＤＰＦ(３)を収容したディーゼルエンジンの排気処理装置において、
ＤＯＣ(２)の排気上流側に形成される排気入口空間(８)の周壁(８ａ)を排気入口側連結部(８ｂ)で分離可能に連結し、この排気入口側連結部(８ｂ)の分離により、ＤＯＣ(２)の排気上流側に位置するＤＰＦケース(１)の排気入口側開口部(３７)を開口できるようにし、
ＤＯＣ(２)とＤＰＦ(３)との間に形成される排気受け渡し空間(６)の周壁(６ａ)に沿って断熱材(７)を配置した、ことを特徴とするディーゼルエンジンの排気処理装置。
(Invention of Claim 2)
Invention specific matters of the invention according to
As illustrated in FIG. 3, in an exhaust treatment device for a diesel engine in which a DOC (2) is accommodated on the exhaust upstream side of the DPF case (1) and a DPF (3) is accommodated on the exhaust downstream side,
The peripheral wall (8a) of the exhaust inlet space (8) formed on the exhaust upstream side of the DOC (2) is detachably connected by an exhaust inlet side connecting portion (8b), and the exhaust inlet side connecting portion (8b) is separated. The exhaust inlet side opening (37) of the DPF case (1) located on the exhaust upstream side of the DOC (2) can be opened,
An exhaust treatment device for a diesel engine, characterized in that a heat insulating material (7) is arranged along a peripheral wall (6a) of an exhaust delivery space (6) formed between the DOC (2) and the DPF (3). .
(請求項１に係る発明)
請求項１に係る発明は、次の効果を奏する。
《効果》 ＤＰＦの再生効率を高めることができる。
図１、図２に例示するように、ＤＯＣ(２)とＤＰＦ(３)との間に形成される排気受け渡し空間(６)の周壁(６ａ)に沿って断熱材(７)を配置したので、ＤＯＣ(２)で昇温させた排気(１６)の熱が排気受け渡し空間(６)の周壁(６ａ)から放熱されにくく、排気温度の低下が抑制され、ＤＰＦ(３)の再生効率を高めることができる。
(Invention of Claim 1)
The invention according to
<Effect> The regeneration efficiency of the DPF can be increased.
As illustrated in FIGS. 1 and 2, the heat insulating material (7) is disposed along the peripheral wall (6 a) of the exhaust delivery space (6) formed between the DOC (2) and the DPF (3). , The heat of the exhaust (16) heated by the DOC (2) is hardly dissipated from the peripheral wall (6a) of the exhaust delivery space (6), and the exhaust temperature is prevented from lowering, and the regeneration efficiency of the DPF (3) is increased. be able to.
《効果》 ＤＰＦのアッシュの除去も支障無く行うことができる。
図１に例示するように、ＤＰＦケース(１)の排気上流端開口部(５)に蓋(４)を取り外し可能に取り付け、この蓋(４)を取り外すことにより、ＤＯＣ(２)の排気上流側に位置するＤＰＦケース(１)の排気上流端開口部(５)を開口できるようにしたので、ＤＰＦケース(１)の排気上流端開口部(５)を開口し、ＤＰＦ(３)をＤＰＦケース(１)に収容したまま、ＤＰＦケース(１)の排気上流端開口部(５)から洗浄流体(例えば、空気)を吸引し、或いは、ＤＰＦケース(１)の排気下流側から洗浄流体(例えば、空気)を圧送することにより、排気(１６)とは逆向きに洗浄流体をＤＰＦ(３)に通過させ、ＤＰＦ(３)の上流側表面に堆積したアッシュを分離させ、ＤＯＣ(２)を介してＤＰＦケース(１)の排気上流端開口部(５)からアッシュを放出することができ、ＤＰＦ(３)のアッシュの除去も支障無く行うことができる。
<< Effect >> DPF ash can be removed without any problem.
As illustrated in FIG. 1, a lid (4) is removably attached to the exhaust upstream end opening (5) of the DPF case (1), and the DOC (2) upstream of exhaust is removed by removing the lid (4). Since the exhaust upstream end opening (5) of the DPF case (1) located on the side can be opened, the exhaust upstream end opening (5) of the DPF case (1) is opened and the DPF (3) is connected to the DPF. While accommodated in the case (1), the cleaning fluid (for example, air) is sucked from the exhaust upstream end opening (5) of the DPF case (1), or the cleaning fluid (from the exhaust downstream side of the DPF case (1) ( For example, by feeding air), the cleaning fluid is passed through the DPF (3) in the opposite direction to the exhaust (16), and the ash deposited on the upstream surface of the DPF (3) is separated, and the DOC (2) Ashes can be discharged from the exhaust upstream end opening (5) of the DPF case (1) through the DPF (3) Ashes can be removed without any problem.
(請求項２に係る発明)
請求項２に係る発明は、次の効果を奏する。
《効果》 ＤＰＦの再生効率を高めることができる。
図３に例示するように、ＤＯＣ(２)とＤＰＦ(３)との間に形成される排気受け渡し空間(６)の周壁(６ａ)に沿って断熱材(７)を配置したので、ＤＯＣ(２)で昇温させた排気(１６)の熱が排気受け渡し空間(６)の周壁(６ａ)から放熱されにくく、排気温度の低下が抑制され、ＤＰＦ(２)の再生効率を高めることができる。
(Invention of Claim 2)
The invention according to
<Effect> The regeneration efficiency of the DPF can be increased.
As illustrated in FIG. 3, since the heat insulating material (7) is disposed along the peripheral wall (6 a) of the exhaust delivery space (6) formed between the DOC (2) and the DPF (3), 2) The heat of the exhaust (16) raised in temperature is hardly dissipated from the peripheral wall (6a) of the exhaust delivery space (6), the exhaust temperature is prevented from lowering, and the regeneration efficiency of the DPF (2) can be increased. .
《効果》 ＤＰＦのアッシュの除去も支障無く行うことができる。
図３に例示するように、ＤＯＣ(２)の排気上流側に形成される排気入口空間(８)の周壁(８ａ)を排気入口側連結部(８ｂ)で分離可能に連結し、この排気入口側連結部(８ｂ)の分離により、ＤＯＣ(２)の排気上流側に位置するＤＰＦケース(１)の排気入口側開口部(３７)を開口できるようにしたので、ＤＰＦケース(１)の排気入口側開口部(３７)を開口し、ＤＰＦ(３)をＤＰＦケース(１)に収容したまま、排気入口側開口部(３７)から洗浄流体(例えば、空気)を吸引し、或いは、ＤＰＦケース(１)の下流側から洗浄流体(例えば、空気)を圧送することにより、排気(１６)とは逆向きに洗浄流体をＤＰＦ(３)に通過させ、ＤＰＦ(３)の上流側表面に堆積したアッシュを分離させ、ＤＯＣ(２)を介してＤＰＦケース(１)の排気入口側開口部(３７)からアッシュを放出することができ、ＤＰＦ(３)のアッシュの除去も支障無く行うことができる。
<< Effect >> DPF ash can be removed without any problem.
As illustrated in FIG. 3, the peripheral wall (8 a) of the exhaust inlet space (8) formed on the exhaust upstream side of the DOC (2) is detachably connected by an exhaust inlet side connecting portion (8 b), and this exhaust inlet By separating the side connecting portion (8b), the exhaust inlet side opening (37) of the DPF case (1) located on the exhaust upstream side of the DOC (2) can be opened, so that the exhaust of the DPF case (1) can be opened. While the inlet side opening (37) is opened and the DPF (3) is accommodated in the DPF case (1), the cleaning fluid (for example, air) is sucked from the exhaust inlet side opening (37), or the DPF case By sending the cleaning fluid (for example, air) from the downstream side of (1), the cleaning fluid is passed through the DPF (3) in the opposite direction to the exhaust (16), and is deposited on the upstream surface of the DPF (3). The ash is separated and released from the exhaust inlet side opening (37) of the DPF case (1) through the DOC (2). It can be, can be carried out without ash also hinder removal of the DPF (3).
(請求項３に係る発明)
請求項３に係る発明は、請求項１または請求項２に係る発明の効果に加え、次の効果を奏する。
《効果》 ＤＰＦのアッシュ除去効率を高めることができる。
図１または図２に例示するように、ＤＰＦ(３)の排気下流側に形成される排気出口空間(９)の周壁(９ａ)を排気出口側連結部(９ｂ)で分離可能に連結し、この排気出口側連結部(９ｂ)の分離により、ＤＰＦ(３)の排気下流側に位置するＤＰＦケース(１)の排気下流側開口部(１０)を開口できるようにしたので、ＤＰＦケース(１)の排気出口側開口部(１０)を開口し、洗浄流体を効率よくＤＰＦ(３)に供給でき、ＤＰＦ(３)のアッシュ除去効率を高めることができる。
(Invention of Claim 3)
The invention according to
<< Effect >> The ash removal efficiency of DPF can be improved.
As illustrated in FIG. 1 or FIG. 2, the peripheral wall (9a) of the exhaust outlet space (9) formed on the exhaust downstream side of the DPF (3) is detachably connected at the exhaust outlet side connecting portion (9b), By separating the exhaust outlet side connecting portion (9b), the exhaust downstream side opening (10) of the DPF case (1) located on the exhaust downstream side of the DPF (3) can be opened. ), The cleaning fluid can be efficiently supplied to the DPF (3), and the ash removal efficiency of the DPF (3) can be increased.
図１、図２に示す第１実施形態について説明する。
図１に示すように、ＤＰＦケース(１)の排気上流側にＤＯＣ(２)を収容し、排気下流側にＤＰＦ(３)を収容している。
ＤＰＦケース(１)は、両端を塞いだ円筒形で、板金で構成されている。
ＤＯＣ(２)は、セラミックのハニカム担体で、酸化触媒を担持させ、セル(２ａ)の両端を開口したフロースルー構造で、セル(２ａ)の内部を排気(１６)が通過するようになっている。ＤＯＣ(２)とＤＰＦケース(１)の周壁との間には、断熱性クッション材(１１)を介在させている。
ＤＰＦ(３)は、セラミックのハニカム担体で、隣合うセル(３ａ)の壁を交互に目封じしたウォールフローモノリスである。セル(３ａ)の内部とセル(３ａ)の壁(３ｂ)を排気が通過し、セル(３ａ)の壁(３ｂ)でＰＭを捕捉する。ＤＰＦ(３)とＤＰＦケース(１)の周壁との間には、断熱性クッション材(１２)を介在させている。
これらの断熱性クッション材(１１)(１２)にはいずれもグラスウールを用いている。
A first embodiment shown in FIGS. 1 and 2 will be described.
As shown in FIG. 1, the DOC (2) is accommodated on the exhaust upstream side of the DPF case (1), and the DPF (3) is accommodated on the exhaust downstream side.
The DPF case (1) has a cylindrical shape with both ends closed and is made of sheet metal.
The DOC (2) is a ceramic honeycomb carrier that supports an oxidation catalyst and has a flow-through structure in which both ends of the cell (2a) are opened. The exhaust (16) passes through the inside of the cell (2a). Yes. A heat insulating cushion material (11) is interposed between the DOC (2) and the peripheral wall of the DPF case (1).
The DPF (3) is a ceramic honeycomb carrier and is a wall flow monolith in which the walls of adjacent cells (3a) are alternately plugged. The exhaust gas passes through the inside of the cell (3a) and the wall (3b) of the cell (3a), and captures PM by the wall (3b) of the cell (3a). A heat insulating cushioning material (12) is interposed between the DPF (3) and the peripheral wall of the DPF case (1).
Glass wool is used for these heat insulating cushion materials (11) and (12).
図１に示すように、ＤＰＦケース(１)の排気上流端開口部(５)に蓋(４)を取り外し可能に取り付け、この蓋(４)を取り外すことにより、ＤＯＣ(２)の排気上流側に位置するＤＰＦケース(１)の排気上流端開口部(５)を開口できるようにしている。
ＤＯＣ(２)とＤＰＦ(３)との間に形成される排気受け渡し空間(６)の周壁(６ａ)に沿って断熱材(７)を配置している。この断熱材(７)にはグラスウールを用いている。
As shown in FIG. 1, the lid (4) is detachably attached to the exhaust upstream end opening (5) of the DPF case (1), and by removing the lid (4), the exhaust upstream side of the DOC (2) The exhaust upstream end opening (5) of the DPF case (1) located in the position can be opened.
The heat insulating material (7) is disposed along the peripheral wall (6a) of the exhaust delivery space (6) formed between the DOC (2) and the DPF (3). Glass wool is used for the heat insulating material (7).
図１に示すように、蓋(４)とＤＰＦケース(１)の排気上流端開口部(５)との境界に蓋連結部(４ａ)を分離可能に設け、この蓋連結部(４ａ)を分離することにより、蓋(４)をＤＰＦケース(１)の排気上流端開口部(５)から取り外せるようにしている。この蓋連結部(４ａ)は蓋(４)に設けた蓋フランジ部(１３)とＤＰＦケース(１)の排気上流端開口部(５)に形成した排気上流端フランジ部(１４)と、これらを締結する蓋取り付け用締結具(１５)で構成されている。蓋取り付け用締結具(１５)はボルトナットである。ＤＰＦケース(１)のＤＯＣ(２)の排気上流側に排気入口空間(８)を設け、この排気入口空間(８)に排気入口パイプ(１７)を挿入し、この排気入口パイプ(１７)の周壁に多数の排気入口孔(１８)を設けている。蓋(４)の表面に沿って断熱材(１９)を配置している。この断熱材(１９)にはグラスウールを用いている。 As shown in FIG. 1, a lid connecting portion (4a) is detachably provided at the boundary between the lid (4) and the exhaust upstream end opening (5) of the DPF case (1), and the lid connecting portion (4a) is provided. By separating, the lid (4) can be removed from the exhaust upstream end opening (5) of the DPF case (1). The lid connecting portion (4a) includes a lid flange portion (13) provided on the lid (4), an exhaust upstream end flange portion (14) formed in the exhaust upstream end opening (5) of the DPF case (1), and these It is comprised with the fastener (15) for lid attachment which fastens. The lid attachment fastener (15) is a bolt and nut. An exhaust inlet space (8) is provided on the exhaust upstream side of the DOC (2) of the DPF case (1). An exhaust inlet pipe (17) is inserted into the exhaust inlet space (8), and the exhaust inlet pipe (17) A number of exhaust inlet holes (18) are provided in the peripheral wall. A heat insulating material (19) is disposed along the surface of the lid (4). Glass wool is used for this heat insulating material (19).
図１に示すように、ＤＰＦケース(１)のＤＰＦ(３)の排気下流側に形成される排気出口空間(９)の周壁(９ａ)を排気出口側連結部(９ｂ)で分離可能に連結し、この排気出口側連結部(９ｂ)の分離により、ＤＰＦ(３)の排気下流側に位置するＤＰＦケース(１)の排気出口側開口部(１０)を開口できるようにしている。排気出口空間(９)に排気出口パイプ(３８)を挿入し、この排気出口パイプ(３８)の周壁に多数の排気出口孔(３９)を設けている。 As shown in FIG. 1, the peripheral wall (9a) of the exhaust outlet space (9) formed on the exhaust downstream side of the DPF (3) of the DPF case (1) is detachably connected by the exhaust outlet side connecting portion (9b). The exhaust outlet side opening (10) of the DPF case (1) located on the exhaust downstream side of the DPF (3) can be opened by separating the exhaust outlet side connecting portion (9b). An exhaust outlet pipe (38) is inserted into the exhaust outlet space (9), and a number of exhaust outlet holes (39) are provided in the peripheral wall of the exhaust outlet pipe (38).
排気出口側連結部(９ｂ)は、ＤＰＦケース(１)のＤＰＦ収容部分の周壁に設けたＤＰＦ側フランジ部(２０)と、ＤＰＦケース(１)の排気出口空間(９)の周壁に設けた排気出口側フランジ部(２１)と、これらを締結する排気出口空間取り付け用締結具(２２)とで構成されている。排気出口空間取り付け用締結具(２２)は、ボルトナットである。排気出口空間(９)の各周壁と端壁に沿って断熱材(１９)を配置している。また、ＤＰＦケース(１)の排気入口空間(８)の周壁、ＤＯＣ収容部分の周壁、ＤＰＦ収容部分の周壁に沿って、断熱材(７)を配置している。この断熱材(７)は、排気受け渡し空間(６)の周壁(６ａ)に沿わせた断熱材(７)と一連のものである。 The exhaust outlet side connecting portion (9b) is provided on the DPF side flange portion (20) provided on the peripheral wall of the DPF housing portion of the DPF case (1) and on the peripheral wall of the exhaust outlet space (9) of the DPF case (1). The exhaust outlet side flange portion (21) and an exhaust outlet space mounting fastener (22) for fastening them are configured. The exhaust outlet space mounting fastener (22) is a bolt and nut. A heat insulating material (19) is arranged along each peripheral wall and end wall of the exhaust outlet space (9). Further, a heat insulating material (7) is disposed along the peripheral wall of the exhaust inlet space (8) of the DPF case (1), the peripheral wall of the DOC storage portion, and the peripheral wall of the DPF storage portion. This heat insulating material (7) is a series of heat insulating materials (7) along the peripheral wall (6a) of the exhaust delivery space (6).
排気入口空間(８)の周壁にセンサ取り付けボス(２３)を取り付け、このセンサ取り付けボス(２３)にＤＯＣ入口側排気温度センサ(２４)を取り付けている。排気受け渡し空間(６)の周壁(６ａ)にセンサ取り付けボス(２５)を取り付け、このセンサ取り付けボス(２５)にＤＰＦ入口側排気温度センサ(２６)を取り付けている。また、排気受け渡し空間(６)の周壁(６ａ)に配管ボス(２７)を取り付け、この配管ボス(２)にＤＰＦ入口側排気圧導入配管(２８)を取り付けている。排気出口空間(９)の周壁に配管ボス(２９)を取り付け、この配管ボス(２９)にＤＰＦ出口側排気圧導入配管(３０)を取り付けている。ＤＰＦ入口側排気圧導入配管(２８)とＤＰＦ出口側排気圧導入配管(３０)とは、差圧センサ(３１)に接続されている。排気出口空間(９)の周壁にセンサ取り付けボス(３２)を取り付け、このセンサ取り付けボス(３２)にＤＰＦ出口側排気温度センサ(３３)を取り付けている。
図２に示すように、ＤＰＦケース(１)の周壁に沿って配置された断熱材(７)は、各センサ取り付けボス(２３)(２５)(３２)や、各配管ボス(２７)(２９)を避けて配置されている。
A sensor mounting boss (23) is mounted on the peripheral wall of the exhaust inlet space (8), and a DOC inlet side exhaust temperature sensor (24) is mounted on the sensor mounting boss (23). A sensor attachment boss (25) is attached to the peripheral wall (6a) of the exhaust delivery space (6), and a DPF inlet side exhaust temperature sensor (26) is attached to the sensor attachment boss (25). A pipe boss (27) is attached to the peripheral wall (6a) of the exhaust delivery space (6), and a DPF inlet side exhaust pressure introduction pipe (28) is attached to the pipe boss (2). A pipe boss (29) is attached to the peripheral wall of the exhaust outlet space (9), and a DPF outlet side exhaust pressure introduction pipe (30) is attached to the pipe boss (29). The DPF inlet side exhaust pressure introduction pipe (28) and the DPF outlet side exhaust pressure introduction pipe (30) are connected to a differential pressure sensor (31). A sensor attachment boss (32) is attached to the peripheral wall of the exhaust outlet space (9), and a DPF outlet side exhaust temperature sensor (33) is attached to the sensor attachment boss (32).
As shown in FIG. 2, the heat insulating material (7) disposed along the peripheral wall of the DPF case (1) is made up of the sensor mounting bosses (23), (25), (32) and the pipe bosses (27), (29). ) Is arranged to avoid.
ＤＯＣ入口側排気温度センサ(２４)、ＤＰＦ入口側排気温度センサ(２６)、ＤＰＦ出口側排気温度センサ(３３)、差圧センサ(３１)、エンジン目標回転数検出センサ(図外)、エンジン実回転数検出センサ(図外)が、エンジンＥＣＵ(図外)に接続され、このエンジンＥＣＵにコモンレール(図外)のインジェクタの電磁弁(図外)が接続されている
エンジン負荷、エンジン回転数、ＤＯＣ上流側排気温度センサ(２４)による検出排気温度、差圧センサ(３１)によるＤＰＦ(３)の上流と下流の差圧等に基づいて、ＤＰＦ(３)でのＰＭの堆積量を推定し、ＰＭの堆積推定量が所定の再生必要量に至った場合には、エンジンＥＣＵの指令に基づいてＤＰＦ(３)の再生処理を行う。
DOC inlet side exhaust temperature sensor (24), DPF inlet side exhaust temperature sensor (26), DPF outlet side exhaust temperature sensor (33), differential pressure sensor (31), engine target speed detection sensor (not shown), engine actual A rotation speed detection sensor (not shown) is connected to the engine ECU (not shown), and an electromagnetic valve (not shown) of the injector of the common rail (not shown) is connected to the engine ECU. Based on the exhaust temperature detected by the DOC upstream exhaust temperature sensor (24), the differential pressure upstream and downstream of the DPF (3) by the differential pressure sensor (31), etc., the PM accumulation amount in the DPF (3) is estimated. When the estimated accumulation amount of PM reaches a predetermined regeneration required amount, the regeneration process of the DPF (3) is performed based on the command of the engine ECU.
ＤＰＦ(３)の再生処理は、次の通りである。
ＤＯＣ入口側排気温度センサ(２４)での検出排気温度が所定のＤＯＣ活性化温度に達していない場合には、メイン噴射後のアフター噴射を行い、排気温度をＤＯＣ活性化温度まで上昇させる。排気温度がＤＯＣ活性化温度を越えると、メイン噴射後、アフター噴射よりも遅い時期に行うポスト噴射を行い、排気(１６)に燃料を混入させ、この燃料をＤＯＣ(２)で酸化燃焼させることにより、排気(１６)の温度を上昇させ、排気(１６)の熱により、ＰＭを焼却除去して、ＤＰＦ(３)を再生する。この場合、ＤＰＦ入口側排気温度センサ(２６)での検出排気温度に応じてポスト噴射量を調節する。そして、ＤＰＦ出口側排気温度センサ(３３)での検出排気温度が所定の異常検出温度に達すると、ポスト噴射を停止或いは大幅に減少させる。
The regeneration process of DPF (3) is as follows.
When the exhaust temperature detected by the DOC inlet side exhaust temperature sensor (24) does not reach the predetermined DOC activation temperature, after injection after the main injection is performed, and the exhaust temperature is raised to the DOC activation temperature. When the exhaust temperature exceeds the DOC activation temperature, post-injection is performed after the main injection at a later timing than after injection, fuel is mixed into the exhaust (16), and this fuel is oxidized and burned with DOC (2). Thus, the temperature of the exhaust (16) is raised, and PM is incinerated and removed by the heat of the exhaust (16) to regenerate the DPF (3). In this case, the post injection amount is adjusted in accordance with the exhaust temperature detected by the DPF inlet side exhaust temperature sensor (26). When the exhaust temperature detected by the DPF outlet side exhaust temperature sensor (33) reaches a predetermined abnormality detection temperature, the post-injection is stopped or significantly reduced.
図３に示す第２実施形態は、次の点が第１実施形態と相違する。
ＤＯＣ(２)の排気上流側に形成される排気入口空間(８)の周壁(８ａ)を排気入口側連結部(８ｂ)で分離可能に連結し、この排気入口側連結部(８ｂ)の分離により、ＤＯＣ(２)の排気上流側に位置するＤＰＦケース(１)の排気入口側開口部(３７)を開口できるようにしている。
The second embodiment shown in FIG. 3 is different from the first embodiment in the following points.
The peripheral wall (8a) of the exhaust inlet space (8) formed on the exhaust upstream side of the DOC (2) is detachably connected by an exhaust inlet side connecting portion (8b), and the exhaust inlet side connecting portion (8b) is separated. Thus, the exhaust inlet side opening (37) of the DPF case (1) located on the exhaust upstream side of the DOC (2) can be opened.
排気入口側連結部(８ｂ)は、排気入口空間(８)の周壁に設けた入口側フランジ部(３４)と、ＤＰＦケース(１)のＤＯＣ収容部分の周壁に設けたＤＯＣ側フランジ部(３５)と、これらを締結する排気入口空間取り付け用締結具(３６)とで構成されている。排気出口空間取り付け用締結具(３６)は、ボルトナットである。
他の構造は、第１実施形態と同じであり、図３中、第１実施形態と同一の要素には、図１、図２と同じ符号を付しておく。
The exhaust inlet side connecting portion (8b) includes an inlet side flange portion (34) provided on the peripheral wall of the exhaust inlet space (8) and a DOC side flange portion (35) provided on the peripheral wall of the DOC housing portion of the DPF case (1). ) And an exhaust inlet space mounting fastener (36) for fastening them. The exhaust outlet space mounting fastener (36) is a bolt and nut.
The other structure is the same as that of the first embodiment. In FIG. 3, the same reference numerals as those of FIGS. 1 and 2 are given to the same elements as those of the first embodiment.
(１) ＤＰＦケース
(２) ＤＯＣ
(３) ＤＰＦ
(４) 蓋
(５) 排気上流側開口部
(６) 排気ガス受け渡し空間
(６ａ) 周壁
(７) 断熱材
(８) 排気入口空間
(８ａ) 周壁
(８ｂ) 配置入口連結部
(９) 排気出口空間
(９ａ) 周壁
(９ｂ) 排気出口側連結部
(１０) 排気出口側開口部
(３７) 排気入口側開口部
(1) DPF case
(2) DOC
(3) DPF
(4) Lid
(5) Exhaust upstream side opening
(6) Exhaust gas delivery space
(6a) Perimeter wall
(7) Insulation
(8) Exhaust inlet space
(8a) Perimeter wall
(8b) Arrangement entrance joint
(9) Exhaust outlet space
(9a) Perimeter wall
(9b) Exhaust outlet side connection
(10) Exhaust outlet side opening
(37) Exhaust inlet side opening
Claims (3)
ＤＰＦケース(１)の排気上流端開口部(５)に蓋(４)を取り外し可能に取り付け、この蓋(４)を取り外すことにより、ＤＯＣ(２)の排気上流側に位置するＤＰＦケース(１)の排気上流端開口部(５)を開口できるようにし、
ＤＯＣ(２)とＤＰＦ(３)との間に形成される排気受け渡し空間(６)の周壁(６ａ)に沿って断熱材(７)を配置した、ことを特徴とするディーゼルエンジンの排気処理装置。 In a diesel engine exhaust treatment apparatus in which a DOC (2) is accommodated on the exhaust upstream side of the DPF case (1) and a DPF (3) is accommodated on the exhaust downstream side,
The lid (4) is detachably attached to the exhaust upstream end opening (5) of the DPF case (1), and the DPF case (1) located on the exhaust upstream side of the DOC (2) is removed by removing the lid (4). ) Exhaust upstream end opening (5) can be opened,
An exhaust treatment device for a diesel engine, characterized in that a heat insulating material (7) is arranged along a peripheral wall (6a) of an exhaust delivery space (6) formed between the DOC (2) and the DPF (3). .
ＤＯＣ(２)の排気上流側に形成される排気入口空間(８)の周壁(８ａ)を排気入口側連結部(８ｂ)で分離可能に連結し、この排気入口側連結部(８ｂ)の分離により、ＤＯＣ(２)の排気上流側に位置するＤＰＦケース(１)の排気入口側開口部(３７)を開口できるようにし、
ＤＯＣ(２)とＤＰＦ(３)との間に形成される排気受け渡し空間(６)の周壁(６ａ)に沿って断熱材(７)を配置した、ことを特徴とするディーゼルエンジンの排気処理装置。 In a diesel engine exhaust treatment apparatus in which a DOC (2) is accommodated on the exhaust upstream side of the DPF case (1) and a DPF (3) is accommodated on the exhaust downstream side,
The peripheral wall (8a) of the exhaust inlet space (8) formed on the exhaust upstream side of the DOC (2) is detachably connected by an exhaust inlet side connecting portion (8b), and the exhaust inlet side connecting portion (8b) is separated. The exhaust inlet side opening (37) of the DPF case (1) located on the exhaust upstream side of the DOC (2) can be opened,
An exhaust treatment device for a diesel engine, characterized in that a heat insulating material (7) is arranged along a peripheral wall (6a) of an exhaust delivery space (6) formed between the DOC (2) and the DPF (3). .
ＤＰＦ(３)の排気下流側に形成される排気出口空間(９)の周壁(９ａ)を排気出口側連結部(９ｂ)で分離可能に連結し、この排気出口側連結部(９ｂ)の分離により、ＤＰＦ(３)の排気下流側に位置するＤＰＦケース(１)の排気出口側開口部(１０)を開口できるようにした、ことを特徴とするディーゼルエンジンの排気処理装置。 In the exhaust treatment device for a diesel engine according to claim 1 or 2,
The peripheral wall (9a) of the exhaust outlet space (9) formed on the exhaust downstream side of the DPF (3) is detachably connected by the exhaust outlet side connecting portion (9b), and the exhaust outlet side connecting portion (9b) is separated. Thus, an exhaust outlet device for a diesel engine, characterized in that the exhaust outlet side opening (10) of the DPF case (1) located on the exhaust downstream side of the DPF (3) can be opened.
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