JP6153829B2 - EGR device - Google Patents

EGR device Download PDF

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JP6153829B2
JP6153829B2 JP2013188922A JP2013188922A JP6153829B2 JP 6153829 B2 JP6153829 B2 JP 6153829B2 JP 2013188922 A JP2013188922 A JP 2013188922A JP 2013188922 A JP2013188922 A JP 2013188922A JP 6153829 B2 JP6153829 B2 JP 6153829B2
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egr
valve
cooler
egr cooler
gas
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JP2015055190A (en
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健 端本
健 端本
啓太 横山
啓太 横山
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Hino Motors Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/12—Improving ICE efficiencies

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Description

本発明は、ＥＧＲ装置に関するものである。   The present invention relates to an EGR device.

従来、自動車のエンジン等では、排気側から排気ガスの一部を還流ガスとして抜き出して吸気側へと戻し、その吸気側に戻された還流ガスでエンジン内での燃料の燃焼を抑制させて燃焼温度を下げることによりＮＯxの発生を低減するようにした、いわゆるＥＧＲ（Exhaust Gas Recirculation）装置を備えて排気ガス再循環を実施するようにしたものがある。   Conventionally, in an automobile engine or the like, a part of exhaust gas is extracted as a recirculation gas from the exhaust side and returned to the intake side, and the recirculation gas returned to the intake side suppresses combustion of fuel in the engine and burns. Some exhaust gas recirculation is provided with a so-called EGR (Exhaust Gas Recirculation) device that reduces the generation of NOx by lowering the temperature.

この際、エンジンに再循環する還流ガスを途中で冷却すると、該還流ガスの温度が下がり且つその容積が小さくなることにより、エンジンの出力を余り低下させずに燃焼温度を低下して効果的にＮＯxの発生を低減させることができるため、還流ガスを再循環する系路の途中には、シェルアンドチューブ型のＥＧＲクーラが装備されているのが一般的である。   At this time, if the recirculated gas that is recirculated to the engine is cooled in the middle, the temperature of the recirculated gas decreases and the volume of the recirculated gas decreases, thereby effectively reducing the combustion temperature without significantly reducing the output of the engine. Since generation of NOx can be reduced, a shell and tube type EGR cooler is generally provided in the middle of a system for recirculating the reflux gas.

図４は従来におけるＥＧＲ装置の一例を示すもので、図中１はエンジン、２は該エンジン１の各気筒３から排出される排気ガス４を集める排気マニホールド、５は該排気マニホールド２から抜き出した排気ガス４の一部を還流ガス４’として吸気管６へと再循環せしめるＥＧＲライン、７は該ＥＧＲライン５の途中に装備されて前記還流ガス４’を冷却水との熱交換により水冷するＥＧＲクーラを示している。   FIG. 4 shows an example of a conventional EGR device, in which 1 is an engine, 2 is an exhaust manifold that collects exhaust gas 4 discharged from each cylinder 3 of the engine 1, and 5 is extracted from the exhaust manifold 2. An EGR line 7 for recirculating a part of the exhaust gas 4 as a recirculation gas 4 ′ to the intake pipe 6 is installed in the middle of the EGR line 5 to cool the recirculation gas 4 ′ by heat exchange with cooling water. An EGR cooler is shown.

前記ＥＧＲライン５は、前記排気マニホールド２における異なる位置から還流ガス４’を夫々抜き出してＥＧＲクーラ７に導く二系統のＥＧＲ分岐管８，９と、前記ＥＧＲクーラ７の出側で還流ガス４’を合流させてから開度調節可能なＥＧＲバルブ１０を介し吸気管６へ導くＥＧＲ合流管１１とにより構成されている。   The EGR line 5 includes two EGR branch pipes 8 and 9 for extracting the reflux gas 4 ′ from different positions in the exhaust manifold 2 and leading them to the EGR cooler 7, and the reflux gas 4 ′ on the outlet side of the EGR cooler 7. And an EGR merging pipe 11 that leads to the intake pipe 6 via an EGR valve 10 whose opening degree can be adjusted.

即ち、ここに図示している例の場合には、エンジン１の各気筒３から異なるタイミングで排出される排気ガス４が排気干渉を起こさないよう排気期間が相互に離れた気筒３を二つのグループに分け、該各グループからの排気ガス４を二系統のＥＧＲ分岐管８，９により別個に還流ガス４’として抜き出してＥＧＲクーラ７に導くことにより、各系統の還流ガス４’を相互に排気干渉させることなく夫々の排気脈動を効果的に利用してＥＧＲクーラ７に導入し易くしている。   That is, in the example shown here, the cylinders 3 whose exhaust periods are separated from each other are divided into two groups so that the exhaust gas 4 discharged from each cylinder 3 of the engine 1 at different timings does not cause exhaust interference. The exhaust gas 4 from each group is separately extracted as the recirculation gas 4 ′ by the two EGR branch pipes 8 and 9 and led to the EGR cooler 7, thereby exhausting the recirculation gas 4 ′ of each system to each other. Each exhaust pulsation is effectively utilized without causing interference to facilitate introduction into the EGR cooler 7.

尚、図４中における符号１２は吸気管６内を流れる吸気を示し、該吸気１２に対し前記ＥＧＲ合流管１１からの還流ガス４’が混合されて吸気マニホールド１３を介しエンジン１の各気筒３へと導かれるようになっている。   In FIG. 4, reference numeral 12 indicates intake air flowing through the intake pipe 6. The return gas 4 ′ from the EGR merging pipe 11 is mixed with the intake air 12, and each cylinder 3 of the engine 1 is passed through the intake manifold 13. Has been led to.

このように排気マニホールド２から還流ガス４’を二系統に分けて抜き出すようにしたＥＧＲ装置に関連する先行技術文献情報としては下記の特許文献１等がある。   As prior art document information related to the EGR device in which the recirculation gas 4 ′ is extracted from the exhaust manifold 2 in two systems, there is the following Patent Document 1 or the like.

特開２００７−２１８１８７号公報JP 2007-218187 A

しかしながら、斯かる従来構造においては、図５に示す如きＥＧＲバルブ１０の全閉時に、行き場を失った各系統の還流ガス４’が、排気脈動によりＥＧＲクーラ７内を行ったり来たりする動きを繰り返してＥＧＲクーラ７内で連続的に冷却される結果、ＥＧＲクーラ７内におけるデポジット（不完全燃焼生成物）の付着堆積が促進されてＥＧＲクーラ７の効率低下や詰まりを招く虞れがあった。   However, in such a conventional structure, when the EGR valve 10 is fully closed as shown in FIG. 5, the recirculation gas 4 ′ of each system that has lost its destination moves back and forth in the EGR cooler 7 due to exhaust pulsation. As a result of repeated cooling in the EGR cooler 7 repeatedly, deposits (incomplete combustion products) in the EGR cooler 7 are promoted to be deposited and the efficiency of the EGR cooler 7 may be reduced or clogged. .

即ち、二系統に分けられたＥＧＲ分岐管８，９は、ＥＧＲクーラ７の出側のＥＧＲ合流管１１まで至って初めて相互間が連通するようになっているので、ＥＧＲ分岐管８，９の何れか一方に導入された還流ガス４’は、ＥＧＲクーラ７の出側でＥＧＲ分岐管８，９の他方に折り返すような動きを成し、これが排気脈動により交互に行われることでＥＧＲクーラ７内を行ったり来たりする動きが繰り返されることになる。   That is, the EGR branch pipes 8 and 9 divided into the two systems communicate with each other only after reaching the EGR merge pipe 11 on the outlet side of the EGR cooler 7. The recirculation gas 4 ′ introduced into one of the EGR coolers 7 moves back to the other of the EGR branch pipes 8 and 9 on the outlet side of the EGR cooler 7. The movement of going back and forth will be repeated.

そして、ＥＧＲクーラ７内で還流ガス４’が行ったり来たりして連続的に冷却されると、ここに燃料由来の高沸点炭化水素成分から成るＳＯＦ分（Soluble Organic Fraction：可溶性有機成分）等が揮発しないままウェットな状態で残留し、ここに流速の低い還流ガス４’の流れに乗り切れない煤分が付着して、そのままデポジットとして成長することになる。   Then, when the reflux gas 4 ′ moves back and forth in the EGR cooler 7 and is continuously cooled, the SOF content (Soluble Organic Fraction) composed of high-boiling hydrocarbon components derived from fuel, etc. Will remain in a wet state without volatilizing, and a portion of the flow rate of the reflux gas 4 'having a low flow rate will adhere to this portion and will grow as a deposit as it is.

本発明は上述の実情に鑑みてなしたもので、ＥＧＲクーラ内におけるデポジットの付着堆積を防止し得るＥＧＲ装置を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an EGR device that can prevent deposits and deposits in an EGR cooler.

本発明は、排気マニホールドにおける異なる位置から相互に排気干渉させないように還流ガスを夫々抜き出してＥＧＲクーラに導く二系統のＥＧＲ分岐管と、前記ＥＧＲクーラの出側で還流ガスを合流させてから開度調節可能なＥＧＲバルブを介し吸気系路に導くＥＧＲ合流管とによりＥＧＲラインを構成したＥＧＲ装置であって、ＥＧＲクーラの入側で各ＥＧＲ分岐管の相互の流路を連通せしめる連通口と、該連通口を前記ＥＧＲバルブの全閉時に開通する開閉可能な連通バルブとを備えたことを特徴とするものである。   In the present invention, two systems of EGR branch pipes for extracting the reflux gas from different positions in the exhaust manifold and introducing them to the EGR cooler and the reflux gas on the outlet side of the EGR cooler are joined and opened. An EGR device in which an EGR line is configured by an EGR merging pipe that leads to an intake system path through an EGR valve that can adjust the degree, and a communication port that communicates the flow paths of the EGR branch pipes on the inlet side of the EGR cooler; The communication port is provided with an openable / closable communication valve that opens when the EGR valve is fully closed.

而して、ＥＧＲバルブの全閉時に連通バルブを開操作すると、連通口が開通することによりＥＧＲクーラの入側で各ＥＧＲ分岐管の相互の流路が連通し、前記ＥＧＲクーラに入る前に還流ガスが各ＥＧＲ分岐管の一方から他方へ折り返し得る状態となるので、排気脈動により還流ガスが行ったり来たりする動きがＥＧＲクーラより上流で起こることになり、該ＥＧＲクーラ内で還流ガスが連続的に冷却されるような事態が回避されてＥＧＲクーラ内におけるデポジットの付着堆積が防止される。   Thus, when the communication valve is opened when the EGR valve is fully closed, the communication ports are opened, so that the flow paths of the respective EGR branch pipes communicate with each other on the entry side of the EGR cooler, and before entering the EGR cooler. Since the reflux gas can be turned from one side of each EGR branch pipe to the other, the movement of the reflux gas due to the exhaust pulsation occurs upstream of the EGR cooler, and the reflux gas flows in the EGR cooler. A situation in which cooling is continuously performed is avoided, and deposit deposition in the EGR cooler is prevented.

また、本発明を具体的に実施するにあたっては、ＥＧＲバルブの開度制御を担う制御装置が前記ＥＧＲバルブの全閉時に連通バルブを開操作するように構成されていることが好ましく、このようにすれば、前記ＥＧＲバルブの全閉時に前記連通バルブを確実に開操作することが可能となる。   Further, in concrete implementation of the present invention, it is preferable that the control device responsible for controlling the opening degree of the EGR valve is configured to open the communication valve when the EGR valve is fully closed. Thus, the communication valve can be reliably opened when the EGR valve is fully closed.

上記した本発明のＥＧＲ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 EGR 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、ＥＧＲバルブの全閉時に連通バルブを開操作して連通口を開通させることにより、ＥＧＲクーラの入側で還流ガスが各ＥＧＲ分岐管の一方から他方へ折り返し得る状態とし、排気脈動により還流ガスが行ったり来たりする動きをＥＧＲクーラより上流で起こさせることができるので、該ＥＧＲクーラ内で還流ガスが連続的に冷却されるような事態を回避してＥＧＲクーラ内におけるデポジットの付着堆積を防止することができ、ＥＧＲクーラの効率低下や詰まりを未然に回避することができる。   (I) According to the invention described in claim 1 of the present invention, when the EGR valve is fully closed, the communication valve is opened to open the communication port, so that the recirculation gas can enter each EGR branch at the inlet side of the EGR cooler. The pipe can be turned from one side to the other, and the recirculation gas can be moved back and forth by exhaust pulsation upstream of the EGR cooler, so that the recirculation gas is continuously cooled in the EGR cooler. By avoiding such a situation, it is possible to prevent deposition and deposition of deposits in the EGR cooler, and it is possible to avoid a decrease in efficiency and clogging of the EGR cooler.

（ＩＩ）本発明の請求項２に記載の発明によれば、ＥＧＲバルブの全閉時に連通バルブを確実に開操作することができ、ＥＧＲクーラ内におけるデポジットの付着堆積をより確実に防止することができる。   (II) According to the invention described in claim 2 of the present invention, the communication valve can be surely opened when the EGR valve is fully closed, and deposit deposition in the EGR cooler can be more reliably prevented. Can do.

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. 図１のＥＧＲバルブと連通バルブの制御系を示すブロック図である。It is a block diagram which shows the control system of the EGR valve of FIG. 1, and a communicating valve. 図１のＥＧＲバルブの全閉時の状態を示す概略図である。It is the schematic which shows the state at the time of a fully closed EGR valve | bulb of FIG. 従来例を示す概略図である。It is the schematic which shows a prior art example. 図４のＥＧＲバルブの全閉時の状態を示す概略図である。It is the schematic which shows the state at the time of a fully closed EGR valve | bulb of FIG.

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〜図３は本発明を実施する形態の一例を示すもので、図４及び図５と同一の符号を付した部分は同一物を表わしている。   1 to 3 show an example of an embodiment for carrying out the present invention, and portions denoted by the same reference numerals as those in FIGS. 4 and 5 represent the same items.

図１に示す如く、本形態例においては、前述した図４及び図５の従来例と略同様に、排気マニホールド２における異なる位置から相互に排気干渉させないように還流ガス４’を夫々抜き出してＥＧＲクーラ７に導く二系統のＥＧＲ分岐管８，９と、前記ＥＧＲクーラ７の出側で還流ガス４’を合流させてから開度調節可能なＥＧＲバルブ１０を介し吸気管６（吸気系路）に導くＥＧＲ合流管１１とによりＥＧＲライン５を構成したＥＧＲ装置に関し、ＥＧＲクーラ７の入側で各ＥＧＲ分岐管８，９の相互の流路を連通せしめる連通口１４と、該連通口１４を前記ＥＧＲバルブ１０の全閉時に開通する開閉可能な連通バルブ１５とを備えたところを特徴としている。   As shown in FIG. 1, in this embodiment, as in the conventional example of FIGS. 4 and 5, the recirculation gas 4 'is extracted from different positions in the exhaust manifold 2 so as not to interfere with each other. An intake pipe 6 (intake system path) via two systems of EGR branch pipes 8 and 9 leading to the cooler 7 and an EGR valve 10 whose opening degree can be adjusted after the reflux gas 4 ′ is merged on the outlet side of the EGR cooler 7. In connection with the EGR apparatus in which the EGR line 5 is constituted by the EGR merging pipe 11 led to the EGR cooler 7, a communication port 14 for connecting the flow paths of the EGR branch pipes 8 and 9 on the entry side of the EGR cooler 7, and the communication port 14 The EGR valve 10 includes an openable / closable communication valve 15 that is opened when the EGR valve 10 is fully closed.

ここで、図２に模式的に示す如く、前記ＥＧＲバルブ１０の開度制御は制御装置１６により担われるようになっているが、該制御装置１６により制御信号１７を介して前記ＥＧＲバルブ１０が全閉とされた際には、同時に前記連通バルブ１５へも制御信号１８が出力されて該連通バルブ１５が開操作されるようになっている。   Here, as schematically shown in FIG. 2, the opening degree control of the EGR valve 10 is carried out by the control device 16, and the EGR valve 10 is controlled by the control device 16 via the control signal 17. When the valve is fully closed, a control signal 18 is simultaneously output to the communication valve 15 so that the communication valve 15 is opened.

而して、ＥＧＲバルブ１０の全閉時に連通バルブ１５を開操作すると、連通口１４が開通することによりＥＧＲクーラ７の入側で各ＥＧＲ分岐管８，９の相互の流路が連通し、前記ＥＧＲクーラ７に入る前に還流ガス４’が各ＥＧＲ分岐管８，９の一方から他方へ折り返し得る状態となるので、排気脈動により還流ガス４’が行ったり来たりする動きがＥＧＲクーラ７より上流で起こることになり、該ＥＧＲクーラ７内で還流ガス４’が連続的に冷却されるような事態が回避されてＥＧＲクーラ７内におけるデポジットの付着堆積が防止される。   Thus, when the communication valve 15 is opened when the EGR valve 10 is fully closed, the communication port 14 is opened, whereby the flow paths of the EGR branch pipes 8 and 9 communicate with each other on the entry side of the EGR cooler 7. Before entering the EGR cooler 7, the reflux gas 4 ′ can be turned back from one of the EGR branch pipes 8, 9 to the other, so that the movement of the reflux gas 4 ′ by the exhaust pulsation moves back and forth. It occurs in the upstream, and a situation in which the reflux gas 4 ′ is continuously cooled in the EGR cooler 7 is avoided, and deposit adhesion and deposition in the EGR cooler 7 is prevented.

従って、上記形態例によれば、ＥＧＲバルブ１０の全閉時に連通バルブ１５を開操作して連通口１４を開通させることにより、ＥＧＲクーラ７の入側で還流ガス４’が各ＥＧＲ分岐管８，９の一方から他方へ折り返し得る状態とし、排気脈動により還流ガス４’が行ったり来たりする動きをＥＧＲクーラ７より上流で起こさせることができるので、該ＥＧＲクーラ７内で還流ガス４’が連続的に冷却されるような事態を回避してＥＧＲクーラ７内におけるデポジットの付着堆積を防止することができ、ＥＧＲクーラ７の効率低下や詰まりを未然に回避することができる。   Therefore, according to the above embodiment, when the EGR valve 10 is fully closed, the communication valve 15 is opened to open the communication port 14, so that the reflux gas 4 ′ is introduced to the EGR branch pipe 8 at the inlet side of the EGR cooler 7. , 9 can be turned from one to the other, and the recirculation gas 4 ′ can be moved back and forth by exhaust pulsation upstream of the EGR cooler 7. Therefore, it is possible to prevent deposits and deposits in the EGR cooler 7 from being continuously cooled, and it is possible to avoid a decrease in efficiency and clogging of the EGR cooler 7 in advance.

また、特に本形態例においては、ＥＧＲバルブ１０の開度制御を担う制御装置１６が前記ＥＧＲバルブ１０の全閉時に連通バルブ１５を開操作するように構成されているので、前記ＥＧＲバルブ１０の全閉時に前記連通バルブ１５を確実に開操作することができ、ＥＧＲクーラ７内におけるデポジットの付着堆積をより確実に防止することができる。   In particular, in the present embodiment, the control device 16 that controls the opening degree of the EGR valve 10 is configured to open the communication valve 15 when the EGR valve 10 is fully closed. When the valve is fully closed, the communication valve 15 can be reliably opened, and deposit adhesion and deposition in the EGR cooler 7 can be more reliably prevented.

尚、本発明のＥＧＲ装置は、上述の形態例にのみ限定されるものではなく、形態例では還流ガスを吸気管に戻す場合で示しているが、還流ガスが戻される吸気系路は吸気マニホールドであっても良いこと、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。   The EGR device of the present invention is not limited to the above-described embodiment. In the embodiment, the recirculation gas is returned to the intake pipe. However, the intake passage for returning the recirculation gas is an intake manifold. Of course, various modifications can be made without departing from the scope of the present invention.

２ 排気マニホールド
４ 排気ガス
４’ 還流ガス
５ ＥＧＲライン
６ 吸気管（吸気系路）
７ ＥＧＲクーラ
８ ＥＧＲ分岐管
９ ＥＧＲ分岐管
１０ ＥＧＲバルブ
１１ ＥＧＲ合流管
１４ 連通口
１５ 連通バルブ
１６ 制御装置 2 Exhaust manifold 4 Exhaust gas 4 'Reflux gas 5 EGR line 6 Intake pipe (intake system path)
7 EGR cooler 8 EGR branch pipe 9 EGR branch pipe 10 EGR valve 11 EGR junction pipe 14 Communication port 15 Communication valve 16 Controller

Claims (2)

排気マニホールドにおける異なる位置から相互に排気干渉させないように還流ガスを夫々抜き出してＥＧＲクーラに導く二系統のＥＧＲ分岐管と、前記ＥＧＲクーラの出側で還流ガスを合流させてから開度調節可能なＥＧＲバルブを介し吸気系路に導くＥＧＲ合流管とによりＥＧＲラインを構成したＥＧＲ装置であって、ＥＧＲクーラの入側で各ＥＧＲ分岐管の相互の流路を連通せしめる連通口と、該連通口を前記ＥＧＲバルブの全閉時に開通する開閉可能な連通バルブとを備えたことを特徴とするＥＧＲ装置。   The recirculation gas is extracted from different positions in the exhaust manifold so as not to interfere with each other and led to the EGR cooler, and the opening can be adjusted after the recirculation gas is merged on the outlet side of the EGR cooler. An EGR device in which an EGR line is configured by an EGR merging pipe that leads to an intake system path via an EGR valve, and a communication port that allows the mutual flow paths of the EGR branch pipes to communicate with each other on the inlet side of the EGR cooler, and the communication port And an openable / closable communication valve that opens when the EGR valve is fully closed. ＥＧＲバルブの開度制御を担う制御装置が前記ＥＧＲバルブの全閉時に連通バルブを開操作するように構成されていることを特徴とする請求項１に記載のＥＧＲ装置。   2. The EGR device according to claim 1, wherein a control device responsible for opening control of the EGR valve is configured to open the communication valve when the EGR valve is fully closed. 3.
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