JP2018159282A - Exhaust emission control device - Google Patents

Exhaust emission control device Download PDF

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JP2018159282A
JP2018159282A JP2017055439A JP2017055439A JP2018159282A JP 2018159282 A JP2018159282 A JP 2018159282A JP 2017055439 A JP2017055439 A JP 2017055439A JP 2017055439 A JP2017055439 A JP 2017055439A JP 2018159282 A JP2018159282 A JP 2018159282A
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fuel
supply path
fuel supply
control device
feed pump
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浩 漆原
Hiroshi Urushibara
浩 漆原
浩史 頓宮
Hiroshi Tonmiya
浩史 頓宮
智之 鶴田
Tomoyuki Tsuruta
智之 鶴田
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Hino Motors Ltd
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Abstract

PROBLEM TO BE SOLVED: To obtain security countermeasures at a low cost in an exhaust emission control device using a plurality of post-treatment devices which need the addition of fuel.SOLUTION: In an exhaust emission control device which comprises a particulate filter 1 and a selective reduction type catalyst 2 as a plurality of post-treatment devices which need the addition of fuel in the middle of an exhaust pipe 3, and in which a fuel supply path 7 is laid from a fuel feed pump 8 toward the filter and the catalyst, and the fuel is independently added to the particulate filter 1 and the selective reduction type catalyst 2 by diverting a part of engine drive fuel from the fuel feed pump 8 by the fuel supply path 7, the fuel supply path 7 is branched at its middle, connected to fuel addition valves 5, 6 at inlet sides of the particulate filter 1 and the selective reduction type catalyst 2, and a fuel cut valve 11 is arranged an upstream side rather than a branch point A of the fuel supply path 7.SELECTED DRAWING: Figure 1

Description

本発明は、燃料添加を要する後処理装置を用いた排気浄化装置に関するものである。   The present invention relates to an exhaust emission control device using an aftertreatment device that requires fuel addition.

従来、ディーゼルエンジンにおいては、排気ガスが流通する排気管の途中に、酸素共存下でも選択的にＮＯx（窒素酸化物）をＨＣ（還元剤）と反応させる性質を備えた選択還元型触媒を装備し、該選択還元型触媒の上流側に燃料を添加することにより、該燃料から生成されるＨＣガスを還元剤として選択還元型触媒上で排気ガス中のＮＯxと還元反応させ、これによりＮＯxの排出濃度を低減し得るようにしたものがある。   Conventionally, diesel engines are equipped with a selective catalytic reduction catalyst that has the property of selectively reacting NOx (nitrogen oxide) with HC (reducing agent) even in the presence of oxygen in the middle of the exhaust pipe through which exhaust gas flows. Then, by adding fuel to the upstream side of the selective catalytic reduction catalyst, the HC gas produced from the fuel is used as a reducing agent to cause a reduction reaction with NOx in the exhaust gas on the selective catalytic reduction catalyst. There is one that can reduce the emission concentration.

他方、ディーゼルエンジンの排気浄化を図る場合、排気ガス中のＮＯxを除去するだけでは十分ではなく、排気ガス中に含まれるパティキュレート（Particulate Matter：粒子状物質）についてもパティキュレートフィルタを通して捕集する必要があるが、この種のパティキュレートフィルタを採用する場合には、目詰まりにより排気抵抗が増加しないうちにパティキュレートを適宜に燃焼除去してパティキュレートフィルタの再生を図る必要がある。   On the other hand, when purifying exhaust gas from a diesel engine, it is not enough to remove NOx in the exhaust gas, and particulates contained in the exhaust gas are also collected through the particulate filter. However, when this type of particulate filter is employed, it is necessary to regenerate the particulate filter by appropriately burning and removing the particulate before the exhaust resistance increases due to clogging.

このため、パティキュレートフィルタの前段に、フロースルー型の酸化触媒を付帯装備させ、パティキュレートの堆積量が増加してきた段階で前記酸化触媒より上流の排気ガス中に燃料を添加してパティキュレートフィルタを強制再生することが考えられている。   For this reason, a flow-through type oxidation catalyst is attached to the preceding stage of the particulate filter, and fuel is added to the exhaust gas upstream from the oxidation catalyst when the amount of particulate accumulation increases. It is considered to force playback.

つまり、酸化触媒より上流の排気ガス中に燃料を添加すれば、その添加燃料（ＨＣ）が前段の酸化触媒を通過する間に酸化反応するので、その反応熱で昇温した排気ガスの流入により直後のパティキュレートフィルタの触媒床温度が上げられてパティキュレートが燃やし尽くされ、パティキュレートフィルタの再生化が図られることになる。   In other words, if fuel is added to the exhaust gas upstream of the oxidation catalyst, the added fuel (HC) undergoes an oxidation reaction while passing through the preceding oxidation catalyst. The catalyst bed temperature of the particulate filter immediately after that is raised, the particulates are burned out, and the particulate filter is regenerated.

このように燃料添加を要する選択還元型触媒やパティキュレートフィルタといった後処理装置に対しては、エンジンフィードポンプからエンジン駆動用燃料の一部を流用して燃料添加を行うようにしているが、近年においては、この種の後処理装置を排気管の下流側にあるマフラ内に収容するようになってきているため、後処理装置が車両後方のエンジンから離れた場所に設置される場合がある。   In such a post-treatment device such as a selective reduction catalyst or a particulate filter that requires fuel addition, fuel is added by diverting part of the engine driving fuel from the engine feed pump. In this case, since this type of aftertreatment device is housed in a muffler on the downstream side of the exhaust pipe, the aftertreatment device may be installed at a location away from the engine behind the vehicle.

このような場合、エンジンフィードポンプからシャシ側を通し燃料供給経路を配索し、該燃料供給経路によりエンジンフィードポンプから添加燃料を導いて排気管途中の後処理装置に添加することが考えられているが、シャシ側を通して燃料供給経路を配索するにあたっては、該燃料供給経路における燃料漏れの対策が最も重要な課題となる。   In such a case, it is considered that a fuel supply path is routed from the engine feed pump through the chassis side, and the added fuel is guided from the engine feed pump through the fuel supply path and added to the post-treatment device in the middle of the exhaust pipe. However, when the fuel supply path is routed through the chassis side, countermeasures against fuel leakage in the fuel supply path are the most important issue.

即ち、ディーゼルエンジン側からシャシ側へと渡る燃料供給経路は、シャシ側を長い経路で配索されることになるため、路面からの飛石による損傷や、冬季における融雪剤等の跳ね上げによる腐食を完全に回避することが難しく、万が一の事態が生じても対応できるようにしておく必要がある。   In other words, since the fuel supply path from the diesel engine side to the chassis side is routed on the chassis side with a long path, damage from stepping stones from the road surface and corrosion due to jumping up snow melting agent etc. in winter It is difficult to avoid it completely, and it is necessary to be able to cope with an emergency.

尚、本発明に関連する先行技術文献情報としては、本発明と同じ出願人による下記の特許文献１等が存在している。   In addition, as prior art document information related to the present invention, there is the following Patent Document 1 by the same applicant as the present invention.

特開２００８−２５４３８号公報JP 2008-25438 A

しかしながら、燃料添加を要する複数の後処理装置が搭載されている場合、該各後処理装置に向けた燃料供給経路毎に保安対策を施すようにしたのでは、コストの大幅な高騰を招いてしまうことが避けられず、コストを抑制しつつ確実な安全性を担保することが難しいという問題があった。   However, when a plurality of aftertreatment devices that require fuel addition are mounted, if security measures are taken for each fuel supply path directed to each aftertreatment device, a significant increase in cost is caused. Inevitably, there is a problem that it is difficult to ensure reliable safety while suppressing costs.

本発明は上述の実情に鑑みてなしたもので、燃料添加を要する複数の後処理装置を用いた排気浄化装置における保安対策を低コストで実現することを目的とする。   The present invention has been made in view of the above-described circumstances, and an object thereof is to realize a security measure in an exhaust purification apparatus using a plurality of aftertreatment devices that require fuel addition at a low cost.

本発明は、排気管途中に燃料添加を要する複数の後処理装置を備え、該各後処理装置に向けフューエルフィードポンプから燃料供給経路を配索し、該燃料供給経路により前記フューエルフィードポンプからエンジン駆動用燃料の一部を流用して前記各後処理装置に個別に燃料添加を行うようにした排気浄化装置であって、前記燃料供給経路が途中で分岐されて前記各後処理装置の入側の燃料添加弁に夫々接続されていると共に、前記燃料供給経路の分岐箇所より上流側にフューエルカットバルブが装備されていることを特徴とするものである。   The present invention includes a plurality of aftertreatment devices that require fuel addition in the middle of an exhaust pipe, and a fuel supply path is routed from each of the fuel feed pumps to each aftertreatment device. An exhaust emission control device in which a part of driving fuel is diverted to individually add fuel to each of the aftertreatment devices, and the fuel supply path is branched halfway to enter the aftertreatment devices. The fuel addition valve is connected to each of the fuel supply valves, and a fuel cut valve is provided on the upstream side of the branch point of the fuel supply path.

而して、このようにすれば、燃料添加を要する複数の後処理装置を用いた排気浄化装置であっても、燃料供給経路を途中で分岐して前記各後処理装置の入側の燃料添加弁に夫々接続しただけの簡素な燃料供給経路で済み、しかも、該燃料供給経路の分岐箇所より上流側にフューエルカットバルブを装備しているので、該フューエルカットバルブを閉じるだけで全ての燃料添加弁に向けた燃料の供給を停止することが可能となる。   Thus, in this way, even in an exhaust gas purification apparatus using a plurality of aftertreatment devices that require fuel addition, the fuel supply path is branched in the middle and fuel addition on the inlet side of each aftertreatment device is performed. A simple fuel supply path connected to each of the valves is sufficient, and a fuel cut valve is installed upstream from the branch point of the fuel supply path, so all the fuel is added simply by closing the fuel cut valve. It becomes possible to stop the supply of fuel toward the valve.

また、本発明を具体的に実施するにあたっては、燃料供給経路の分岐箇所より下流側に圧力センサが夫々設置され、該各圧力センサにより異常な供給圧力の低下が検知された時に前記フューエルカットバルブを閉じる制御装置が備えられていることが好ましい。   Further, when the present invention is specifically implemented, pressure sensors are respectively installed on the downstream side of the branched portions of the fuel supply path, and the fuel cut valve is detected when an abnormal drop in supply pressure is detected by each pressure sensor. It is preferable that a control device for closing is provided.

そのようにすれば、各燃料添加弁に繋がる燃料供給経路の途中で燃料漏れが生じたとしても、その燃料漏れの発生が異常な圧力低下として圧力センサにより検知され、制御装置によりフューエルカットバルブを直ちに閉じる措置が取られる。   By doing so, even if a fuel leak occurs in the middle of the fuel supply path connected to each fuel addition valve, the occurrence of the fuel leak is detected by the pressure sensor as an abnormal pressure drop, and the fuel cut valve is opened by the control device. Immediate closing measures are taken.

また、このように圧力センサにより燃料漏れの発生を検知するにあたっては、燃料供給経路の分岐箇所より下流側にフューエルフィードポンプからの燃料の脈動を消すオリフィスを装備するか、燃料供給経路の分岐箇所と各圧力センサとの間にフューエルフィードポンプからの燃料の脈動を消すオリフィスを夫々装備すると良く、このようにすれば、オリフィスにより燃料の脈動が消されて該脈動の影響による圧力センサの誤検知が回避される。   In addition, when detecting the occurrence of fuel leakage by the pressure sensor in this way, an orifice that eliminates the fuel pulsation from the fuel feed pump is provided downstream from the branch point of the fuel supply path, or the branch point of the fuel supply path is provided. It is better to equip each pressure sensor with an orifice that eliminates the fuel pulsation from the fuel feed pump. By doing so, the fuel pulsation is eliminated by the orifice, and the pressure sensor is erroneously detected due to the influence of the pulsation. Is avoided.

上記した本発明の排気浄化装置によれば、下記の如き種々の優れた効果を奏し得る。   According to the exhaust emission control device of the present invention described above, various excellent effects as described below can be obtained.

（Ｉ）本発明の請求項１に記載の発明によれば、燃料供給経路の簡素化を図り且つフューエルカットバルブの装備数を必要最小限に抑制しながらも、燃料漏れが疑われた際に全ての燃料添加弁に向けた燃料の供給を確実に停止することができ、燃料添加を要する複数の後処理装置を用いた排気浄化装置における保安対策を低コストで実現することができる。   (I) According to the invention described in claim 1 of the present invention, when the fuel supply path is simplified and the number of fuel cut valves is minimized, the fuel leakage is suspected. The supply of fuel to all the fuel addition valves can be stopped reliably, and the security measures in the exhaust purification system using a plurality of aftertreatment devices that require fuel addition can be realized at low cost.

（ＩＩ）本発明の請求項２に記載の発明によれば、各燃料添加弁に繋がる燃料供給経路の途中で燃料漏れが生じたとしても、その燃料漏れの発生を異常な圧力低下として圧力センサにより検知することができ、制御装置によりフューエルカットバルブを直ちに閉じる措置を取ることができるので、より安全性の高い保安対策を講じることができる。   (II) According to the invention described in claim 2 of the present invention, even if a fuel leak occurs in the middle of the fuel supply path connected to each fuel addition valve, the pressure sensor detects the occurrence of the fuel leak as an abnormal pressure drop. Therefore, it is possible to take a measure for immediately closing the fuel cut valve by the control device, so that it is possible to take a safer security measure.

（ＩＩＩ）本発明の請求項３、４に記載の発明によれば、オリフィスにより燃料の脈動を消して該脈動の影響による圧力センサの誤検知を回避することができ、より正確に燃料漏れの発生を検知することができる。   (III) According to the third and fourth aspects of the present invention, the pulsation of the fuel can be extinguished by the orifice, so that erroneous detection of the pressure sensor due to the influence of the pulsation can be avoided, and the fuel leakage can be more accurately detected. Occurrence can be detected.

本発明を実施する形態の一例を示す概略図である。It is the schematic which shows an example of the form which implements this invention. 本発明の別の形態例を示す概略図である。It is the schematic which shows another form example of this invention.

以下本発明の実施の形態を図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は本発明を実施する形態の一例を示すもので、燃料添加を要する複数の後処理装置としてパティキュレートフィルタ１と選択還元型触媒２とを排気管３途中に備えた場合を例示しており、前記パティキュレートフィルタ１の入側に酸化触媒４を介して燃料添加弁５が配設され、前記選択還元型触媒２の入側には別の燃料添加弁６が配設されており、更に、これら各燃料添加弁５，６に向けて燃料供給経路７が配索され、該燃料供給経路７によりフューエルフィードポンプ８からエンジン駆動用燃料の一部が抜き出されて導かれるようになっている。   FIG. 1 shows an example of an embodiment for carrying out the present invention, and exemplifies a case where a particulate filter 1 and a selective catalytic reduction catalyst 2 are provided in the middle of an exhaust pipe 3 as a plurality of aftertreatment devices that require fuel addition. A fuel addition valve 5 is disposed on the inlet side of the particulate filter 1 via the oxidation catalyst 4, and another fuel addition valve 6 is disposed on the inlet side of the selective reduction catalyst 2. Furthermore, a fuel supply path 7 is routed toward each of these fuel addition valves 5, 6, and a part of the fuel for driving the engine is extracted from the fuel feed pump 8 and guided by the fuel supply path 7. ing.

より詳細に述べると、燃料タンク９の燃料がフューエルフィードポンプ８により汲み上げられてディーゼルエンジン１０へと送られるようになっているが、フューエルフィードポンプ８からディーゼルエンジン１０へ送られる燃料の一部を燃料供給経路７へ抜き出し、該燃料供給経路７を途中で分岐して前記各燃料添加弁５，６に夫々接続するようにしてあり、前記燃料供給経路７の分岐箇所Ａより上流側には、流路を閉じて燃料の供給を停止し得るフューエルカットバルブ１１を装備している。   More specifically, the fuel in the fuel tank 9 is pumped up by the fuel feed pump 8 and sent to the diesel engine 10, but a part of the fuel sent from the fuel feed pump 8 to the diesel engine 10 is used. The fuel supply path 7 is extracted, and the fuel supply path 7 is branched halfway and connected to each of the fuel addition valves 5 and 6, respectively. A fuel cut valve 11 that can close the flow path and stop the fuel supply is provided.

また、燃料供給経路７の分岐箇所Ａより下流側には、各燃料添加弁５，６に向かう燃料の圧力を検出するための圧力センサ１２，１３が夫々設置されており、該各圧力センサ１２，１３による検出値が検出信号１２ａ，１３ａとして制御装置１４に入力され、前記各圧力センサ１２，１３により異常な供給圧力の低下が検知された時に前記制御装置１４にて燃料漏れが生じているものと判定され、前記制御装置１４から前記フューエルカットバルブ１１を閉じる制御信号１４ａが出力されるようになっている。   Further, pressure sensors 12 and 13 for detecting the pressure of the fuel directed to the fuel addition valves 5 and 6 are respectively installed downstream of the branch point A of the fuel supply path 7. , 13 are input to the control device 14 as detection signals 12a, 13a, and fuel leakage occurs in the control device 14 when an abnormal drop in supply pressure is detected by the pressure sensors 12, 13. The control device 14 outputs a control signal 14 a for closing the fuel cut valve 11.

ここで、前記燃料供給経路７における分岐箇所Ａの上流側には、燃料の流路を絞り込むオリフィス１５が装備されており、該オリフィス１５によりフューエルフィードポンプ８からの燃料の脈動が消され、該脈動の影響による前記各圧力センサ１２，１３の誤検知が未然に回避されるようにしてある。   Here, on the upstream side of the branch point A in the fuel supply path 7, an orifice 15 for narrowing the fuel flow path is provided, and the pulsation of fuel from the fuel feed pump 8 is eliminated by the orifice 15, The erroneous detection of the pressure sensors 12 and 13 due to the influence of pulsation is avoided in advance.

即ち、レシプロタイプのフューエルフィードポンプ８から送り出される燃料には脈動が生じているため、オリフィス１５により燃料の流路を絞り込むことで脈動の無い流れに変えて下流側へ送り、各圧力センサ１２，１３が脈動の無い燃料を検知対象とするようにしてある。   That is, since the pulsation is generated in the fuel sent out from the reciprocating type fuel feed pump 8, the flow of the fuel is narrowed by the orifice 15, so that the flow is changed to a flow without pulsation and sent to the downstream side. Reference numeral 13 designates a fuel having no pulsation as a detection target.

而して、このようにすれば、燃料添加を要する複数の後処理装置としてパティキュレートフィルタ１と選択還元型触媒２とを用いた排気浄化装置であっても、燃料供給経路７を途中で分岐して前記各燃料添加弁５，６に夫々接続しただけの簡素な燃料供給経路７で済み、しかも、該燃料供給経路７の分岐箇所Ａより上流側にフューエルカットバルブ１１を装備しているので、該フューエルカットバルブ１１を閉じるだけで全ての燃料添加弁５，６に向けた燃料の供給を停止することが可能となる。   Thus, in this way, even in the exhaust purification device using the particulate filter 1 and the selective reduction catalyst 2 as a plurality of aftertreatment devices that require fuel addition, the fuel supply path 7 is branched in the middle. Thus, a simple fuel supply path 7 simply connected to each of the fuel addition valves 5 and 6 is sufficient, and a fuel cut valve 11 is provided upstream of the branching point A of the fuel supply path 7. The fuel supply to all the fuel addition valves 5 and 6 can be stopped simply by closing the fuel cut valve 11.

即ち、各燃料添加弁５，６に繋がる燃料供給経路７の途中で燃料漏れが生じたとしても、その燃料漏れの発生が異常な圧力低下として圧力センサ１２，１３により検知され、制御装置１４によりフューエルカットバルブ１１を直ちに閉じる措置が取られ、全ての燃料添加弁５，６に向けた燃料の供給が停止される。   That is, even if a fuel leak occurs in the middle of the fuel supply path 7 connected to each fuel addition valve 5, 6, the occurrence of the fuel leak is detected as an abnormal pressure drop by the pressure sensors 12, 13, and the control device 14 A measure is taken to immediately close the fuel cut valve 11, and the fuel supply to all the fuel addition valves 5 and 6 is stopped.

また、このように圧力センサ１２，１３により燃料漏れの発生を検知するにあたり、燃料供給経路７の分岐箇所Ａより上流側にフューエルフィードポンプ８からの燃料の脈動を消すオリフィス１５が装備されているので、オリフィス１５により燃料の脈動が消されて該脈動の影響による圧力センサ１２，１３の誤検知が回避される。   In addition, when the occurrence of fuel leakage is detected by the pressure sensors 12 and 13 as described above, an orifice 15 that eliminates fuel pulsation from the fuel feed pump 8 is provided upstream of the branch point A of the fuel supply path 7. Therefore, the pulsation of the fuel is eliminated by the orifice 15, and erroneous detection of the pressure sensors 12, 13 due to the influence of the pulsation is avoided.

従って、上記形態例によれば、燃料供給経路７の簡素化を図り且つフューエルカットバルブ１１の装備数を必要最小限に抑制しながらも、燃料漏れが疑われた際に全ての燃料添加弁５，６に向けた燃料の供給を確実に停止することができ、燃料添加を要する複数の後処理装置としてパティキュレートフィルタ１と選択還元型触媒２とを用いた排気浄化装置における保安対策を低コストで実現することができる。   Therefore, according to the above embodiment, all the fuel addition valves 5 can be used when fuel leakage is suspected while simplifying the fuel supply path 7 and suppressing the number of equipped fuel cut valves 11 to the minimum necessary. , 6 can be reliably stopped, and the safety measures in the exhaust purification system using the particulate filter 1 and the selective reduction catalyst 2 as a plurality of aftertreatment devices that require fuel addition can be reduced in cost. Can be realized.

また、各燃料添加弁５，６に繋がる燃料供給経路７の途中で燃料漏れが生じたとしても、その燃料漏れの発生を異常な圧力低下として圧力センサ１２，１３により検知することができ、制御装置１４によりフューエルカットバルブ１１を直ちに閉じる措置を取ることができるので、より安全性の高い保安対策を講じることができ、しかも、オリフィス１５により燃料の脈動を消して該脈動の影響による圧力センサ１２，１３の誤検知を回避することができるので、より正確に燃料漏れの発生を検知することができる。   Even if a fuel leak occurs in the middle of the fuel supply path 7 connected to each fuel addition valve 5, 6, the occurrence of the fuel leak can be detected as an abnormal pressure drop by the pressure sensors 12, 13. Since the fuel cut valve 11 can be immediately closed by the device 14, it is possible to take a safer safety measure. Further, the pressure sensor 12 can eliminate the fuel pulsation by the orifice 15 and cause the influence of the pulsation. , 13 can be avoided, so that the occurrence of fuel leakage can be detected more accurately.

図２は本発明の別の形態例を示すもので、本形態例においては、図１の形態例で燃料供給経路７における分岐箇所Ａの上流側に装備していたオリフィス１５を、前記燃料供給経路７の分岐箇所Ａと各圧力センサ１２，１３との間に夫々装備するようにしており、このようにした場合には、各オリフィス１５，１５をサイズ違いの仕様として各圧力センサ１２，１３までの配管長さに応じた脈動抑制作用を付与することが可能となり、フューエルフィードポンプ８からの燃料の脈動を効果的に消すことができて、該脈動の影響による前記各圧力センサ１２，１３の誤検知をより一層確実に回避することができる。   FIG. 2 shows another embodiment of the present invention. In this embodiment, the orifice 15 provided on the upstream side of the branch point A in the fuel supply path 7 in the embodiment of FIG. Each of the pressure sensors 12 and 13 is provided between the branch point A of the path 7 and each of the pressure sensors 12 and 13. In this case, each of the orifices 15 and 15 has a different size specification. It is possible to provide a pulsation suppressing action according to the length of the pipe up to the above, and the pulsation of the fuel from the fuel feed pump 8 can be effectively eliminated, and the pressure sensors 12 and 13 due to the influence of the pulsation. Can be more reliably avoided.

尚、本発明の排気浄化装置は、上述の形態例にのみ限定されるものではなく、燃料添加を要する後処理装置には、パティキュレートフィルタや選択還元型触媒以外のものを適用しても良く、例えば、ＮＯx吸蔵還元触媒等を後処理装置として適用することも可能であること、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   Note that the exhaust purification apparatus of the present invention is not limited to the above-described embodiment, and a post-processing apparatus that requires fuel addition may be applied other than a particulate filter or a selective catalytic reduction catalyst. For example, it is possible to apply a NOx occlusion reduction catalyst or the like as an aftertreatment device, and it is needless to say that various modifications can be made without departing from the scope of the present invention.

１ パティキュレートフィルタ（燃料添加を要する後処理装置）
２ 選択還元型触媒（燃料添加を要する後処理装置）
３ 排気管
５ 燃料添加弁
６ 燃料添加弁
７ 燃料供給経路
８ フューエルフィードポンプ
１１ フューエルカットバルブ
１２ 圧力センサ
１３ 圧力センサ
１４ 制御装置
１５ オリフィス
Ａ 分岐箇所 1 Particulate filter (post-processing device that requires fuel addition)
2 Selective reduction catalyst (post-treatment device that requires fuel addition)
3 Exhaust pipe 5 Fuel addition valve 6 Fuel addition valve 7 Fuel supply path 8 Fuel feed pump 11 Fuel cut valve 12 Pressure sensor 13 Pressure sensor 14 Controller 15 Orifice A Branch location

Claims (4)

排気管途中に燃料添加を要する複数の後処理装置を備え、該各後処理装置に向けフューエルフィードポンプから燃料供給経路を配索し、該燃料供給経路により前記フューエルフィードポンプからエンジン駆動用燃料の一部を流用して前記各後処理装置に個別に燃料添加を行うようにした排気浄化装置であって、前記燃料供給経路が途中で分岐されて前記各後処理装置の入側の燃料添加弁に夫々接続されていると共に、前記燃料供給経路の分岐箇所より上流側にフューエルカットバルブが装備されていることを特徴とする排気浄化装置。   A plurality of aftertreatment devices that require fuel addition in the middle of the exhaust pipe are provided, a fuel supply path is routed from the fuel feed pump toward each aftertreatment device, and the fuel for the engine drive is supplied from the fuel feed pump through the fuel supply path. An exhaust gas purification apparatus in which a part of the fuel is individually added to each of the aftertreatment devices, wherein the fuel supply path is branched in the middle and the fuel addition valve on the entry side of each of the aftertreatment devices And an exhaust purification device, wherein a fuel cut valve is provided on the upstream side of the branched portion of the fuel supply path. 燃料供給経路の分岐箇所より下流側に圧力センサが夫々設置され、該各圧力センサにより異常な供給圧力の低下が検知された時に前記フューエルカットバルブを閉じる制御装置が備えられていることを特徴とする請求項１に記載の排気浄化装置。   A pressure sensor is installed downstream from the branch point of the fuel supply path, and a control device is provided for closing the fuel cut valve when an abnormal drop in supply pressure is detected by each pressure sensor. The exhaust emission control device according to claim 1. 燃料供給経路の分岐箇所より上流側にフューエルフィードポンプからの燃料の脈動を消すオリフィスが装備されていることを特徴とする請求項２に記載の排気浄化装置。   The exhaust emission control device according to claim 2, wherein an orifice for eliminating fuel pulsation from a fuel feed pump is provided upstream of a branch point of the fuel supply path. 燃料供給経路の分岐箇所と各圧力センサとの間にフューエルフィードポンプからの燃料の脈動を消すオリフィスが夫々装備されていることを特徴とする請求項２に記載の排気浄化装置。   The exhaust emission control device according to claim 2, wherein an orifice for eliminating fuel pulsation from a fuel feed pump is provided between a branch point of the fuel supply path and each pressure sensor.
JP2017055439A 2017-03-22 2017-03-22 Exhaust emission control device Pending JP2018159282A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002256850A (en) * 2001-03-02 2002-09-11 Denso Corp Fuel adding device to catalyst device
JP2009057926A (en) * 2007-08-31 2009-03-19 Denso Corp Fuel injection device and fuel injection system
DE102011003912A1 (en) * 2011-02-10 2012-08-16 Robert Bosch Gmbh Device for dosing liquid for supporting exhaust gas treatment in exhaust line of internal combustion engine, has nozzle assembly for dosing liquid in exhaust line of internal combustion engine
JP2013174203A (en) * 2012-02-27 2013-09-05 Hino Motors Ltd Exhaust emission control device
JP2017020358A (en) * 2015-07-07 2017-01-26 日野自動車株式会社 Abnormality determination device of additive supply system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002256850A (en) * 2001-03-02 2002-09-11 Denso Corp Fuel adding device to catalyst device
JP2009057926A (en) * 2007-08-31 2009-03-19 Denso Corp Fuel injection device and fuel injection system
DE102011003912A1 (en) * 2011-02-10 2012-08-16 Robert Bosch Gmbh Device for dosing liquid for supporting exhaust gas treatment in exhaust line of internal combustion engine, has nozzle assembly for dosing liquid in exhaust line of internal combustion engine
JP2013174203A (en) * 2012-02-27 2013-09-05 Hino Motors Ltd Exhaust emission control device
JP2017020358A (en) * 2015-07-07 2017-01-26 日野自動車株式会社 Abnormality determination device of additive supply system

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