JP2009097340A - Egr device - Google Patents

Egr device Download PDF

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JP2009097340A
JP2009097340A JP2007266588A JP2007266588A JP2009097340A JP 2009097340 A JP2009097340 A JP 2009097340A JP 2007266588 A JP2007266588 A JP 2007266588A JP 2007266588 A JP2007266588 A JP 2007266588A JP 2009097340 A JP2009097340 A JP 2009097340A
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egr cooler
air
exhaust gas
tube
outlet
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JP5112805B2 (en
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Eiko Shiga
栄孝 志賀
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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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

<P>PROBLEM TO BE SOLVED: To provide an EGR device making arrangement of large scale facilities such as a bypass pipe and a bypass valve for countermeasure against freezing unnecessary, and relaxing restriction in layout. <P>SOLUTION: The EGR device which is provided with a water cooled EGR cooler in a middle of an EGR pipe extracting part of exhaust gas 8 from an exhaust side and re-circulating the same to an intake side, and with an air cooled EGR cooler 17 at a downstream of the water cooled EGR cooler, is provided with a hot water pipe 24 making engine coolant 25 flow therein and heating a part near an outlet of a tube 21 as a heating means near the outlet of the tube 21 making the exhaust gas 8 flow therein of the air cooler EGR cooler 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

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.

従来より、自動車のエンジンなどでは、排気側から排気ガスの一部を抜き出して吸気側へと戻し、その吸気側に戻された排気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（窒素酸化物）の発生を低減するようにした、いわゆる排気ガス再循環（ＥＧＲ：Exhaust Gas Recirculation）が行われている。   Conventionally, in an automobile engine or the like, a part of the exhaust gas is extracted from the exhaust side and returned to the intake side, and the exhaust gas returned to the intake side suppresses the combustion of fuel in the engine to increase the combustion temperature. So-called exhaust gas recirculation (EGR) is performed in which the generation of NOx (nitrogen oxide) is reduced by lowering.

一般的に、この種の排気ガス再循環を行う場合には、排気マニホールドから排気管に亘る排気通路の適宜位置と、吸気管から吸気マニホールドに亘る吸気通路の適宜位置との間をＥＧＲパイプにより接続し、該ＥＧＲパイプを通して排気ガスを再循環するようにしている。   In general, when this type of exhaust gas recirculation is performed, an EGR pipe is used between an appropriate position of the exhaust passage extending from the exhaust manifold to the exhaust pipe and an appropriate position of the intake passage extending from the intake pipe to the intake manifold. The exhaust gas is recirculated through the EGR pipe.

この際、エンジンに再循環する排気ガスをＥＧＲパイプの途中で冷却すると、排気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、エンジンに排気ガスを再循環するＥＧＲパイプの途中に水冷式のＥＧＲクーラを装備したものがあり、更には、その下流側に空冷式ＥＧＲクーラを併用したものも知られている。   At this time, if the exhaust gas recirculated to the engine is cooled in the middle of the EGR pipe, the temperature of the exhaust gas decreases and its volume decreases, thereby reducing the combustion temperature without significantly reducing the engine output. Since the generation of NOx can be reduced, there is an EGR pipe equipped with a water-cooled EGR cooler in the middle of the EGR pipe that recirculates exhaust gas to the engine. Further, an air-cooled EGR cooler is installed downstream of the EGR pipe. The combination is also known.

図４は従来における水冷式ＥＧＲクーラと空冷式ＥＧＲクーラとを併用したＥＧＲ装置の一例を示すもので、図中１はディーゼル機関であるエンジンを示し、該エンジン１は、ターボチャージャ２を備えており、エアクリーナ３から導いた吸気４を吸気管５を通し前記ターボチャージャ２のコンプレッサ２ａへ送り、該コンプレッサ２ａで加圧された吸気４をインタークーラ６へと送って冷却し、該インタークーラ６から更に吸気マニホールド７へと吸気４を導いてエンジン１の各気筒（図４では直列６気筒の場合を例示している）に分配するようにしてある。   FIG. 4 shows an example of an EGR apparatus using a conventional water-cooled EGR cooler and an air-cooled EGR cooler. In the figure, 1 shows an engine that is a diesel engine, and the engine 1 includes a turbocharger 2. The intake air 4 guided from the air cleaner 3 is sent to the compressor 2a of the turbocharger 2 through the intake pipe 5, and the intake air 4 pressurized by the compressor 2a is sent to the intercooler 6 to be cooled. Then, the intake air 4 is guided to the intake manifold 7 and distributed to each cylinder of the engine 1 (in FIG. 4, the case of in-line 6 cylinders is illustrated).

また、このエンジン１の各気筒から排出された排気ガス８を排気マニホールド９を介し前記ターボチャージャ２のタービン２ｂへ送り、該タービン２ｂを駆動した排気ガス８を排気管１０を介し車外へ排出するようにしてある。   The exhaust gas 8 discharged from each cylinder of the engine 1 is sent to the turbine 2b of the turbocharger 2 through the exhaust manifold 9, and the exhaust gas 8 driving the turbine 2b is discharged out of the vehicle through the exhaust pipe 10. It is like that.

そして、排気マニホールド９と吸気マニホールド７との間がＥＧＲパイプ１１により接続されており、該ＥＧＲパイプ１１を介し排気マニホールド９から排気ガス８の一部を抜き出して吸気マニホールド７に導き得るようにしてある。   The exhaust manifold 9 and the intake manifold 7 are connected by an EGR pipe 11 so that a part of the exhaust gas 8 can be extracted from the exhaust manifold 9 via the EGR pipe 11 and guided to the intake manifold 7. is there.

ここで、前記ＥＧＲパイプ１１には、排気ガス８の再循環量を適宜に調節し得るよう開度調整可能なＥＧＲバルブ１２と、再循環される排気ガス８を冷却水１３との熱交換により冷却する水冷式ＥＧＲクーラ１４と、該水冷式ＥＧＲクーラ１４からの排気ガス８をエンジン１前面のファン１５により吸引される外気１６との熱交換により冷却する空冷式ＥＧＲクーラ１７とが装備されている。   Here, the EGR pipe 11 has an EGR valve 12 whose opening degree can be adjusted so that the recirculation amount of the exhaust gas 8 can be adjusted appropriately, and the recirculated exhaust gas 8 by heat exchange with the cooling water 13. A water-cooled EGR cooler 14 for cooling and an air-cooled EGR cooler 17 for cooling the exhaust gas 8 from the water-cooled EGR cooler 14 by heat exchange with the outside air 16 sucked by the fan 15 on the front surface of the engine 1 are provided. Yes.

また、この種のＥＧＲ装置にあっては、例えば、外気温度が氷点下になっているような寒冷地での走行時に、空冷式ＥＧＲクーラ１７の出口付近で排気ガス８中の水蒸気が凝縮し、その凝縮水が空冷式ＥＧＲクーラ１７のチューブ内で凍結してガス流路が閉塞してしまったり、凍結による堆積変化でチューブに損傷を及ぼしたりする虞れがあったため、ＥＧＲパイプ１１に空冷式ＥＧＲクーラ１７を迂回するバイパスパイプ１８を付設し、バイパスバルブ１９で流路を切り替えることにより排気ガス８をバイパスパイプ１８側へ流し得るようになっている。   Further, in this type of EGR device, for example, when traveling in a cold region where the outside air temperature is below freezing point, water vapor in the exhaust gas 8 is condensed near the outlet of the air-cooled EGR cooler 17, Since the condensed water may freeze in the tube of the air-cooled EGR cooler 17 and the gas flow path may be blocked, or the tube may be damaged due to the deposition change due to freezing. A bypass pipe 18 that bypasses the EGR cooler 17 is attached, and the exhaust gas 8 can flow toward the bypass pipe 18 by switching the flow path with a bypass valve 19.

尚、前述の如き水冷式ＥＧＲクーラ１４と空冷式ＥＧＲクーラ１７とを併用したＥＧＲ装置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等が既に存在している。
特開２００２−１８８５２６号公報 In addition, as prior art document information related to the EGR apparatus using both the water-cooled EGR cooler 14 and the air-cooled EGR cooler 17 as described above, the following Patent Document 1 by the same applicant as the present invention already exists. Yes.
JP 2002-188526 A

しかしながら、斯かる従来構造では、限られたエンジンルーム内でファン１５の前方に図示しないラジエータを避けながらインタークーラ６と一緒に空冷式ＥＧＲクーラ１７を配置し、しかも、これらに吸気管５やＥＧＲパイプ１１を配管するというだけでもレイアウトが困難であるのに、ここに更に凍結対策のためのバイパスパイプ１８やバイパスバルブ１９の配置スペースを確保するというのは容易なことではなく、非常に厳しいレイアウト上の制約を強いられていた。   However, in such a conventional structure, an air-cooled EGR cooler 17 is disposed together with the intercooler 6 while avoiding a radiator (not shown) in front of the fan 15 in a limited engine room, and the intake pipe 5 and the EGR are provided in these. Although it is difficult to lay out the pipe 11 alone, it is not easy to secure an arrangement space for the bypass pipe 18 and the bypass valve 19 as a countermeasure against freezing. The above restrictions were imposed.

本発明は上述の実情に鑑みてなしたもので、凍結対策のためのバイパスパイプやバイパスバルブといった大掛かりな設備の配置を不要としてレイアウト上の制約を緩和し得る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 alleviate restrictions on the layout by eliminating the need for large-scale equipment such as bypass pipes and bypass valves for countermeasures against freezing. To do.

本発明は、排気側から排気ガスの一部を抜き出して吸気側へ再循環するＥＧＲパイプの途中に水冷式ＥＧＲクーラを備え、該水冷式ＥＧＲクーラの下流側に空冷式ＥＧＲクーラを更に備えたＥＧＲ装置において、前記空冷式ＥＧＲクーラの排気ガスを流すチューブの出口付近に加熱手段を設けたことを特徴とするものである。   The present invention includes a water-cooled EGR cooler in the middle of an EGR pipe that extracts a part of exhaust gas from the exhaust side and recirculates to the intake side, and further includes an air-cooled EGR cooler downstream of the water-cooled EGR cooler. In the EGR apparatus, a heating means is provided in the vicinity of the outlet of the tube through which the exhaust gas of the air-cooled EGR cooler flows.

而して、このようにすれば、例えば、外気温度が氷点下になっているような寒冷地での走行時に、前段の水冷式ＥＧＲクーラで冷却された排気ガスが後段の空冷式ＥＧＲクーラで更に冷却されることでチューブの出口付近で排気ガス中の水蒸気が凝縮してしまったとしても、空冷式ＥＧＲクーラ自体に備えた加熱手段によりチューブの出口付近を加熱して凝縮水の凍結を防止することが可能となる。   Thus, for example, when traveling in a cold region where the outside air temperature is below freezing point, the exhaust gas cooled by the preceding water-cooled EGR cooler is further passed by the latter-stage air-cooled EGR cooler. Even if the water vapor in the exhaust gas is condensed near the outlet of the tube due to cooling, the vicinity of the outlet of the tube is heated by the heating means provided in the air-cooled EGR cooler itself to prevent the condensed water from freezing. It becomes possible.

この結果、凍結対策のためのバイパスパイプやバイパスバルブといった大掛かりな設備を配置しなくても、空冷式ＥＧＲクーラのチューブ内で凝縮水が凍結してガス流路が閉塞してしまったり、凍結による堆積変化でチューブに損傷を及ぼしたりする虞れが未然に回避されることになる。   As a result, the condensate freezes in the tube of the air-cooled EGR cooler and the gas flow path is blocked without the installation of large facilities such as bypass pipes and bypass valves for measures against freezing. The risk of damage to the tube due to changes in deposition is avoided beforehand.

また、本発明においては、空冷式ＥＧＲクーラの排気ガスを流すチューブの出口付近に隣接して配管され且つその内部にエンジン冷却水を流通させて前記チューブの出口付近を加熱する温水パイプを加熱手段としたり、或いは、空冷式ＥＧＲクーラの排気ガスを流すチューブの出口付近に隣接して配索され且つ通電により発熱して前記チューブの出口付近を加熱する電熱線を加熱手段としたりすることが可能である。   Further, in the present invention, the heating means is provided with a hot water pipe that is arranged adjacent to the vicinity of the outlet of the tube through which the exhaust gas of the air-cooled EGR cooler flows, and heats the vicinity of the outlet of the tube by circulating engine cooling water therein Or, the heating means can be a heating wire that is arranged adjacent to the vicinity of the outlet of the tube through which the exhaust gas of the air-cooled EGR cooler flows and that generates heat by energization to heat the vicinity of the outlet of the tube. It is.

上記した本発明のＥＧＲ装置によれば、空冷式ＥＧＲクーラのチューブの出口付近で排気ガス中の水蒸気が凝縮してしまったとしても、空冷式ＥＧＲクーラ自体に備えた加熱手段によりチューブの出口付近を加熱して凝縮水の凍結を防止することができるので、凍結対策のためのバイパスパイプやバイパスバルブといった大掛かりな設備の配置を不要とすることができ、エンジンルーム内におけるレイアウト上の制約を従来よりも大幅に緩和することができるという優れた効果を奏し得る。   According to the above-described EGR device of the present invention, even if water vapor in the exhaust gas is condensed near the outlet of the tube of the air-cooled EGR cooler, the heating means provided in the air-cooled EGR cooler itself makes the vicinity of the outlet of the tube Can be used to prevent the condensation water from freezing, eliminating the need for large-scale equipment such as bypass pipes and bypass valves to prevent freezing. It is possible to achieve an excellent effect that it can be greatly relaxed.

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及び図２は本発明を実施する形態の一例を示すもので、図４と略同様に構成したＥＧＲ装置における空冷式ＥＧＲクーラ１７の詳細を示しており、以下の説明で空冷式ＥＧＲクーラ１７以外の構成要件については図４を参照するものとする。   1 and 2 show an example of an embodiment for carrying out the present invention, showing details of an air-cooled EGR cooler 17 in an EGR device configured substantially the same as FIG. 4, and the air-cooled EGR cooler will be described below. Refer to FIG. 4 for configuration requirements other than 17.

ここに図示している空冷式ＥＧＲクーラ１７は、既存のインタークーラと類似した基本構造を有しており、水冷式ＥＧＲクーラ１４（図４参照）から導かれた排気ガス８を入口タンク２０に受け、ここから複数本のチューブ２１に振り分けて流す間に外気１６（図４参照）との熱交換により冷却し、これにより冷却された排気ガス８を出口タンク２２に回収して吸気マニホールド７（図４参照）へと送り出すようにしてあり、前記チューブ２１の相互間には、外気１６（図４参照）との熱交換効率を高めるためのフィン２３が介装されている。   The air-cooled EGR cooler 17 shown here has a basic structure similar to that of an existing intercooler, and the exhaust gas 8 guided from the water-cooled EGR cooler 14 (see FIG. 4) is supplied to the inlet tank 20. Then, while being distributed to the plurality of tubes 21 from here, it is cooled by heat exchange with the outside air 16 (see FIG. 4), and the exhaust gas 8 cooled thereby is collected in the outlet tank 22 and is taken into the intake manifold 7 ( The fins 23 are interposed between the tubes 21 to enhance the efficiency of heat exchange with the outside air 16 (see FIG. 4).

ただし、本形態例における空冷式ＥＧＲクーラ１７のチューブ２１の出口付近では、該各チューブ２１の相互間にフィン２３が介装されておらず、ここには各チューブ２１の相互間を縫うように紆余曲折して該各チューブ２１と近接するように温水パイプ２４が加熱手段として配管されており、該温水パイプ２４には、その近傍に配置されている図示しないラジエータ（図４中の空冷式ＥＧＲクーラ１７とファン１５との間に配置）の高温側からエンジン冷却水２５の一部を導いて流通させてから前記ラジエータの低温側に戻すようにしてある。   However, in the vicinity of the outlet of the tube 21 of the air-cooled EGR cooler 17 in this embodiment, the fins 23 are not interposed between the tubes 21, so that the tubes 21 are sewn together. A hot water pipe 24 is provided as a heating means so as to be bent and twisted, and the hot water pipe 24 is provided with a radiator (not shown) (air-cooled EGR in FIG. 4) disposed in the vicinity thereof. A part of the engine cooling water 25 is guided from the high temperature side of the cooler 17 and the fan 15 and then returned to the low temperature side of the radiator.

而して、このようにすれば、例えば、外気温度が氷点下になっているような寒冷地での走行時に、前段の水冷式ＥＧＲクーラ１４（図４参照）で冷却された排気ガス８が後段の空冷式ＥＧＲクーラ１７で更に冷却されることでチューブ２１の出口付近で排気ガス８中の水蒸気が凝縮してしまったとしても、温水パイプ２４にラジエータからエンジン冷却水２５の一部を導いて流通させ、これにより各チューブ２１の出口付近をエンジン冷却水２５が持つ熱により加熱して凝縮水の凍結を防止することが可能となる。   Thus, for example, when traveling in a cold region where the outside air temperature is below freezing point, the exhaust gas 8 cooled by the preceding water-cooled EGR cooler 14 (see FIG. 4) is moved to the rear stage. Even if the water vapor in the exhaust gas 8 is condensed near the outlet of the tube 21 by further cooling by the air-cooled EGR cooler 17, a part of the engine cooling water 25 is led from the radiator to the hot water pipe 24. This makes it possible to prevent the condensed water from freezing by heating the vicinity of the outlet of each tube 21 with the heat of the engine cooling water 25.

この結果、凍結対策のためのバイパスパイプ１８（図４参照）やバイパスバルブ１９（図４参照）といった大掛かりな設備を配置しなくても、空冷式ＥＧＲクーラ１７のチューブ２１内で凝縮水が凍結してガス流路が閉塞してしまったり、凍結による堆積変化でチューブ２１に損傷を及ぼしたりする虞れが未然に回避されることになる。   As a result, the condensed water is frozen in the tube 21 of the air-cooled EGR cooler 17 without arranging large-scale equipment such as a bypass pipe 18 (see FIG. 4) and a bypass valve 19 (see FIG. 4) as countermeasures against freezing. Thus, the possibility that the gas flow path is blocked or the tube 21 is damaged due to a change in accumulation due to freezing is avoided in advance.

従って、上記形態例によれば、空冷式ＥＧＲクーラ１７自体に備えた温水パイプ２４により各チューブ２１の出口付近をエンジン冷却水２５の熱で加熱して凝縮水の凍結を防止することができるので、凍結対策のためのバイパスパイプ１８（図４参照）やバイパスバルブ１９（図４参照）といった大掛かりな設備の配置を不要とすることができ、エンジンルーム内におけるレイアウト上の制約を従来よりも大幅に緩和することができる。   Therefore, according to the above embodiment, the vicinity of the outlet of each tube 21 can be heated by the heat of the engine cooling water 25 by the hot water pipe 24 provided in the air-cooled EGR cooler 17 itself, so that the condensed water can be prevented from freezing. This eliminates the need for large-scale equipment such as the bypass pipe 18 (see FIG. 4) and bypass valve 19 (see FIG. 4) as a countermeasure against freezing, and greatly restricts the layout in the engine room. Can be relaxed.

また、図３は本発明の別の形態例を示すもので、空冷式ＥＧＲクーラ１７の各チューブ２１の出口付近における相互間に、通電により発熱して各チューブ２１の出口付近を加熱し得るよう電熱線２６を組み込んだ特殊なフィン２７を加熱手段として介装しており、該各フィン２７に組み込まれた各電熱線２６はバッテリ２８に対しスイッチ２９を介して並列に接続されるようにしてある。   FIG. 3 shows another embodiment of the present invention, and heat is generated by energization between the vicinity of the outlets of the tubes 21 of the air-cooled EGR cooler 17 so that the vicinity of the outlets of the tubes 21 can be heated. Special fins 27 incorporating heating wires 26 are interposed as heating means, and each heating wire 26 incorporated in each fin 27 is connected in parallel to a battery 28 via a switch 29. is there.

このようにすれば、例えば、外気温度が氷点下になっているような寒冷地での走行時に、前段の水冷式ＥＧＲクーラ１４（図４参照）で冷却された排気ガス８が後段の空冷式ＥＧＲクーラ１７で更に冷却されることでチューブ２１の出口付近で排気ガス８中の水蒸気が凝縮してしまったとしても、フィン２７の電熱線２６に通電することより各チューブ２１の出口付近を電熱線２６の熱で加熱して凝縮水の凍結を防止することが可能となる。   In this way, for example, when traveling in a cold region where the outside air temperature is below freezing, the exhaust gas 8 cooled by the preceding water-cooled EGR cooler 14 (see FIG. 4) is converted to the subsequent air-cooled EGR. Even if the water vapor in the exhaust gas 8 is condensed in the vicinity of the outlet of the tube 21 due to further cooling by the cooler 17, a heating wire is provided in the vicinity of the outlet of each tube 21 by energizing the heating wire 26 of the fin 27. It is possible to prevent the condensed water from freezing by heating with heat of 26.

この結果、凍結対策のためのバイパスパイプ１８（図４参照）やバイパスバルブ１９（図４参照）といった大掛かりな設備を配置しなくても、空冷式ＥＧＲクーラ１７のチューブ２１内で凝縮水が凍結してガス流路が閉塞してしまったり、凍結による堆積変化でチューブ２１に損傷を及ぼしたりする虞れが未然に回避される。   As a result, the condensed water is frozen in the tube 21 of the air-cooled EGR cooler 17 without arranging large-scale equipment such as a bypass pipe 18 (see FIG. 4) and a bypass valve 19 (see FIG. 4) as countermeasures against freezing. Thus, the possibility that the gas flow path is blocked or the tube 21 is damaged due to the deposition change due to freezing is avoided in advance.

従って、このようにした場合でも、空冷式ＥＧＲクーラ１７自体に備えた電熱線２６により各チューブ２１の出口付近を電熱線２６の熱で加熱して凝縮水の凍結を防止することができるので、凍結対策のためのバイパスパイプ１８（図４参照）やバイパスバルブ１９（図４参照）といった大掛かりな設備の配置を不要とすることができ、エンジンルーム内におけるレイアウト上の制約を従来よりも大幅に緩和することができる。   Therefore, even in this case, the vicinity of the outlet of each tube 21 can be heated with the heat of the heating wire 26 by the heating wire 26 provided in the air-cooled EGR cooler 17 itself, so that the condensed water can be prevented from freezing. Large-scale equipment such as a bypass pipe 18 (see FIG. 4) and a bypass valve 19 (see FIG. 4) as countermeasures against freezing can be dispensed with, and the layout restrictions in the engine room are significantly greater than before. Can be relaxed.

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、温水パイプの形状は図示例に限定されないこと、また、電熱線は必ずしもフィンに組み込ませて配置しなくても良いこと、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 only to the above-described embodiment, and the shape of the hot water pipe is not limited to the illustrated example, and the heating wire does not necessarily have to be installed in the fin. Of course, various modifications can be made without departing from the scope of the present invention.

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ＩＩ−ＩＩ矢視の要部を拡大した断面図である。It is sectional drawing to which the principal part of the II-II arrow of FIG. 1 was expanded. 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. 従来例を示す概略図である。It is the schematic which shows a prior art example.

符号の説明Explanation of symbols

１ エンジン
４ 吸気
７ 吸気マニホールド
８ 排気ガス
９ 排気マニホールド
１０ 排気管
１１ ＥＧＲパイプ
１３ 冷却水
１４ 水冷式ＥＧＲクーラ
１７ 空冷式ＥＧＲクーラ
２１ チューブ
２４ 温水パイプ（加熱手段）
２５ エンジン冷却水
２６ 電熱線（加熱手段） DESCRIPTION OF SYMBOLS 1 Engine 4 Intake 7 Intake manifold 8 Exhaust gas 9 Exhaust manifold 10 Exhaust pipe 11 EGR pipe 13 Cooling water 14 Water-cooled EGR cooler 17 Air-cooled EGR cooler 21 Tube 24 Hot water pipe (heating means)
25 Engine cooling water 26 Heating wire (heating means)

Claims (3)

排気側から排気ガスの一部を抜き出して吸気側へ再循環するＥＧＲパイプの途中に水冷式ＥＧＲクーラを備え、該水冷式ＥＧＲクーラの下流側に空冷式ＥＧＲクーラを更に備えたＥＧＲ装置において、前記空冷式ＥＧＲクーラの排気ガスを流すチューブの出口付近に加熱手段を設けたことを特徴とするＥＧＲ装置。   In an EGR apparatus further comprising a water-cooled EGR cooler in the middle of an EGR pipe that extracts a part of exhaust gas from the exhaust side and recirculates to the intake side, and further includes an air-cooled EGR cooler downstream of the water-cooled EGR cooler. An EGR apparatus characterized in that a heating means is provided in the vicinity of an outlet of a tube through which exhaust gas of the air-cooled EGR cooler flows. 空冷式ＥＧＲクーラの排気ガスを流すチューブの出口付近に隣接して配管され且つその内部にエンジン冷却水を流通させて前記チューブの出口付近を加熱する温水パイプを加熱手段としたことを特徴とする請求項１に記載のＥＧＲ装置。   A heating water pipe is provided adjacent to the vicinity of the outlet of the tube through which the exhaust gas of the air-cooled EGR cooler flows, and the engine cooling water is circulated therein to heat the vicinity of the outlet of the tube. The EGR device according to claim 1. 空冷式ＥＧＲクーラの排気ガスを流すチューブの出口付近に隣接して配索され且つ通電により発熱して前記チューブの出口付近を加熱する電熱線を加熱手段としたことを特徴とする請求項１に記載のＥＧＲ装置。   The heating wire is a heating wire that is arranged adjacent to the vicinity of the outlet of the tube through which the exhaust gas of the air-cooled EGR cooler flows, and generates heat by energization to heat the vicinity of the outlet of the tube. The EGR device described.
JP2007266588A 2007-10-12 2007-10-12 EGR device Expired - Fee Related JP5112805B2 (en)

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