JP2002089375A - EGR device for internal combustion engine - Google Patents
EGR device for internal combustion engineInfo
- Publication number
- JP2002089375A JP2002089375A JP2000275428A JP2000275428A JP2002089375A JP 2002089375 A JP2002089375 A JP 2002089375A JP 2000275428 A JP2000275428 A JP 2000275428A JP 2000275428 A JP2000275428 A JP 2000275428A JP 2002089375 A JP2002089375 A JP 2002089375A
- Authority
- JP
- Japan
- Prior art keywords
- egr
- passage
- gas
- compressor
- turbine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/34—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with compressors, turbines or the like in the recirculation passage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
- F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
- F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Supercharger (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
(57)【要約】
【課題】 ＥＧＲクーラーにおけるミストの発生を抑制
するとともに、排気圧と吸気圧との圧力差を確保して高
負荷域まで含めた広い運転領域において大量のＥＧＲの
実施を可能にし、更には清浄なＥＧＲガスを還流させ
る。
【解決手段】 このＥＧＲ装置は、ＥＧＲ通路に設けら
れＥＧＲガスを冷却する冷却手段と、その冷却手段より
上流側のＥＧＲ通路に設けられＥＧＲガスを圧縮するＥ
ＧＲガス用コンプレッサと、その冷却手段より下流側の
ＥＧＲ通路に設けられＥＧＲガスを膨張させるＥＧＲガ
ス用タービンと、そのＥＧＲガス用コンプレッサ及びタ
ービンを駆動する駆動手段と、を具備する。また、ＥＧ
Ｒ通路は、過給機のタービンより下流側の排気通路と、
過給機のコンプレッサより上流側の吸気通路とを連通す
る。パティキュレートフィルタ付きの機関の場合、ＥＧ
Ｒ通路は、フィルタより下流側の排気通路に接続され
る。
(57) [Problem] To suppress the generation of mist in an EGR cooler, secure a pressure difference between exhaust pressure and intake pressure, and perform a large amount of EGR in a wide operating region including a high load region. And then recirculate the clean EGR gas. The EGR device includes a cooling unit provided in an EGR passage for cooling EGR gas, and an EGR unit provided in an EGR passage upstream of the cooling unit for compressing the EGR gas.
The EGR gas compressor includes: a GR gas compressor; an EGR gas turbine provided in an EGR passage downstream of the cooling unit for expanding the EGR gas; and a driving unit for driving the EGR gas compressor and the turbine. EG
The R passage has an exhaust passage downstream of the turbocharger turbine,
It communicates with the intake passage upstream of the compressor of the supercharger. In the case of an engine with a particulate filter, EG
The R passage is connected to an exhaust passage downstream of the filter.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、窒素酸化物（ＮＯ
x ）の排出量低減を目的として、内燃機関の排気系から
吸気系へ排気ガスを還流させるＥＧＲ（排気ガス再循
環： Exhaust Gas Recirculation）装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to nitrogen oxides (NO
The present invention relates to an EGR (Exhaust Gas Recirculation) device that recirculates exhaust gas from an exhaust system of an internal combustion engine to an intake system for the purpose of reducing the emission of x ).
【０００２】[0002]
【従来の技術】従来より、自動車用内燃機関において
は、排出ガス浄化対策の１つとして、空気中のＮ2 に比
較し熱容量の大きいＣＯ2 を含む排気ガスを燃焼室に再
循環させることにより、燃焼温度を下げ、窒素酸化物
（ＮＯx ）の生成を抑制する排気ガス再循環（ＥＧＲ）
が行われている。ＥＧＲは、スモークを増やすが、空気
過剰率が高いディーゼル機関ではＮＯx 低減策として広
く採用されている。かかるＥＧＲの制御は、排気通路と
吸気通路とを連通する排気還流通路（ＥＧＲ通路）内に
ＥＧＲ弁を設け、そのＥＧＲ弁を開閉することにより実
行される。2. Description of the Related Art Conventionally, in internal combustion engines for automobiles, as one of exhaust gas purifying measures, exhaust gas containing CO 2 having a larger heat capacity than N 2 in air is recirculated to a combustion chamber. Exhaust gas recirculation (EGR) to reduce combustion temperature and suppress generation of nitrogen oxides (NO x )
Has been done. EGR may increase smoke, but is widely employed as a NO x reduction measures at the excess air ratio is high diesel engine. Such EGR control is performed by providing an EGR valve in an exhaust gas recirculation passage (EGR passage) that connects the exhaust passage and the intake passage, and opening and closing the EGR valve.
【０００３】ＥＧＲは排気ガスを吸気中へ再循環させる
ものであるが、排気ガスは高温であるため、高温で膨張
した状態の排気ガスをそのまま吸気中に戻すと、新気量
が減少するとともに燃焼室の温度が高くなり、結果とし
て、ＮＯx の低減を充分に図ることができずスモークも
増大する。そこで、ＥＧＲガスを冷却するためのＥＧＲ
クーラーがＥＧＲ通路に設けられるようになってきてい
る。[0003] EGR recirculates exhaust gas into the intake air. However, since the exhaust gas is high in temperature, if the exhaust gas which has been expanded at a high temperature is returned to the intake air as it is, the amount of fresh air is reduced. the temperature of the combustion chamber becomes higher, as a result, also increases smoke can not be fully attained reduction of NO x. Therefore, an EGR for cooling the EGR gas
Coolers are being provided in EGR passages.
【０００４】[0004]
【発明が解決しようとする課題】ところで、ＥＧＲクー
ラーにおいては、ガス温度が低下するため、ガスがミス
ト状になり、クーラーの内部に付着して、クーラーが詰
まるという問題がある。特に、軽負荷のときなど、ＥＧ
Ｒガスの温度がそもそも低い状態にあるときには、ＥＧ
ＲガスがＥＧＲクーラーでさらに冷やされることによ
り、この問題が発生しやすくなる。However, in the EGR cooler, there is a problem that the gas becomes mist-like because the gas temperature is lowered, and the gas adheres to the inside of the cooler, and the cooler is clogged. Especially when the load is light, EG
When the temperature of the R gas is originally low, EG
This problem is likely to occur when the R gas is further cooled by the EGR cooler.
【０００５】また、ＥＧＲは排気圧と吸気圧との圧力差
を利用して排気ガスを吸気中に再循環させるものである
が、ＥＧＲ通路中に設けられるＥＧＲクーラーは通気抵
抗として作用しその圧力差を減少させるものであるた
め、ＥＧＲガス流量が減少するという問題がある。特
に、過給機付きの内燃機関では、排気圧が増大するもの
の吸気圧も増大してその圧力差が小さくなっているた
め、ＥＧＲクーラーによる圧力差の低下が無視できなく
なる。一方、排出ガス浄化性能の更なる向上が求められ
ている近年においては、吸気圧が高くなる高負荷運転領
域においてもＥＧＲを実施することが要請されているた
め、一般に、圧力差を確保する対策を講ずる必要があ
る。The EGR utilizes the pressure difference between the exhaust pressure and the intake pressure to recirculate the exhaust gas into the intake air. The EGR cooler provided in the EGR passage acts as a ventilation resistance, and the pressure decreases. Since the difference is reduced, there is a problem that the EGR gas flow rate is reduced. In particular, in an internal combustion engine with a supercharger, although the exhaust pressure increases, the intake pressure also increases and the pressure difference decreases, so that the decrease in the pressure difference due to the EGR cooler cannot be ignored. On the other hand, in recent years in which further improvement in exhaust gas purification performance is required, it is required to perform EGR even in a high-load operation region where intake pressure is high. Need to be taken.
【０００６】さらに、ＥＧＲ装置に関しては、ＥＧＲ弁
の詰まり、ＥＧＲクーラーの詰まり、過給機のコンプレ
ッサの詰まり、内燃機関内部の汚れ、等を防止する観点
から、ＥＧＲガスの浄化が要求されている。Further, regarding the EGR device, purification of the EGR gas is required from the viewpoint of preventing clogging of an EGR valve, clogging of an EGR cooler, clogging of a compressor of a supercharger, dirt inside an internal combustion engine, and the like. .
【０００７】本発明は、上述した問題点に鑑みてなされ
たものであり、その目的は、ＥＧＲクーラーにおけるミ
ストの発生を抑制するとともに、排気圧と吸気圧との圧
力差を確保して高負荷域まで含めた広い運転領域におい
て大量のＥＧＲの実施を可能にし、更には清浄なＥＧＲ
ガスを還流させることができる、内燃機関のＥＧＲ装置
を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to suppress the generation of mist in an EGR cooler and to secure a pressure difference between exhaust pressure and intake pressure to achieve high load. A large amount of EGR in a wide operating area including the
An object of the present invention is to provide an EGR device for an internal combustion engine that can recirculate gas.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明によれば、ＥＧＲ通路に設けられＥＧＲガス
を冷却する冷却手段と、前記冷却手段より上流側のＥＧ
Ｒ通路に設けられＥＧＲガスを圧縮するＥＧＲガス用コ
ンプレッサと、前記冷却手段より下流側のＥＧＲ通路に
設けられＥＧＲガスを膨張させるＥＧＲガス用タービン
と、前記ＥＧＲガス用コンプレッサ及び前記ＥＧＲガス
用タービンを駆動する駆動手段と、を具備する、内燃機
関のＥＧＲ装置が提供される。According to the present invention, there is provided, in accordance with the present invention, a cooling means provided in an EGR passage for cooling EGR gas, and an EG upstream of the cooling means.
An EGR gas compressor provided in the R passage for compressing the EGR gas; an EGR gas turbine provided in the EGR passage downstream of the cooling means for expanding the EGR gas; the EGR gas compressor and the EGR gas turbine And a driving means for driving the EGR device.
【０００９】また、本発明によれば、ＥＧＲ通路は、過
給機のタービンより下流側の排気通路と、過給機のコン
プレッサより上流側の吸気通路と、を連通する。Further, according to the present invention, the EGR passage communicates the exhaust passage downstream of the turbine of the supercharger with the intake passage upstream of the compressor of the supercharger.
【００１０】また、本発明によれば、ＥＧＲ通路は、パ
ティキュレートフィルタより下流側の排気通路と、過給
機のコンプレッサより上流側の吸気通路と、を連通す
る。[0010] According to the present invention, the EGR passage communicates the exhaust passage downstream of the particulate filter with the intake passage upstream of the compressor of the supercharger.
【００１１】[0011]
【発明の実施の形態】以下、添付図面を参照して本発明
の実施形態について説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１２】図１は、本発明によるＥＧＲ装置を備えた
ディーゼル機関を概略的に示す図である。機関における
燃焼に必要な空気は、吸気通路２０を介して機関本体１
０に供給される。詳細には、空気は、エアクリーナ２２
でろ過され、過給機のコンプレッサ２４で圧縮され、イ
ンタクーラ２６で冷却され、吸気マニホルド２８に導か
れる。吸気マニホルド２８で、吸入空気は、機関本体１
０の各気筒に分配される。そして、機関本体１０の各気
筒において発生する排気ガスは、排気通路３０から排出
される。詳細には、排気ガスは、排気マニホルド３２で
集められ、次いで過給機のタービン３４（コンプレッサ
２４と同軸で接続される）に通された後、最後にディー
ゼルパティキュレートフィルタ（ＤＰＦ）３６で浄化さ
れて排出される。FIG. 1 is a diagram schematically showing a diesel engine provided with an EGR device according to the present invention. Air required for combustion in the engine is supplied to the engine body 1 through the intake passage 20.
0 is supplied. Specifically, the air is supplied to the air cleaner 22.
, Compressed by a compressor 24 of a supercharger, cooled by an intercooler 26, and guided to an intake manifold 28. In the intake manifold 28, the intake air
0 is distributed to each cylinder. Then, exhaust gas generated in each cylinder of the engine body 10 is discharged from the exhaust passage 30. Specifically, the exhaust gas is collected in an exhaust manifold 32 and then passed through a turbocharger turbine 34 (coaxially connected to the compressor 24), and finally purified by a diesel particulate filter (DPF) 36. Is discharged.
【００１３】ディーゼル機関では、大きな空気過剰率の
下で燃料が燃焼せしめられるため、不完全燃焼成分であ
るＨＣ（炭化水素）及びＣＯ（一酸化炭素）の排出量が
少ない反面、空気中の窒素と燃え残りの酸素とが反応し
て生成されるＮＯx （窒素酸化物）やパティキュレート
（粒子状物質）の排出量が多い。パティキュレートは、
黒煙（煤、drysoot ）、可溶性有機物質（Soluble Orga
nic Fraction：ＳＯＦ）、サルフェート（硫酸ミスト
等）などからなる複合体であるが、その大部分は黒煙で
ある。内燃機関における燃焼の改善のみでは、充分にパ
ティキュレートを低減することができないため、後処理
として排気系でパティキュレートをトラップ（捕集）し
て低減するためにＤＰＦ３６が設けられている。[0013] In a diesel engine, fuel is burned under a large excess air ratio, so that HC (hydrocarbon) and CO (carbon monoxide), which are incomplete combustion components, are emitted in a small amount, but nitrogen in the air is reduced. The amount of NO x (nitrogen oxide) and particulates (particulate matter) generated by the reaction between oxygen and residual oxygen is large. Particulates are
Black smoke (soot, drysoot), soluble organic substances (Soluble Orga)
The complex is composed of nic fraction (SOF), sulfate (sulfate mist, etc.), but most of it is black smoke. Since the particulates cannot be sufficiently reduced only by improving the combustion in the internal combustion engine, the DPF 36 is provided as a post-process to trap and reduce the particulates in the exhaust system.
【００１４】一方、この内燃機関は、ＮＯx （窒素酸化
物）の低減を目的とするＥＧＲ装置を有しており、排気
通路３０と吸気通路２０との間には、排気ガスを循環さ
せるためのＥＧＲ通路４０が設けられている。そのガス
再循環量は、そのＥＧＲ通路４０の途中に設けられたＥ
ＧＲ弁４２によって調節される。さらに、ＥＧＲ通路４
０には、ＥＧＲガスを冷却するためのＥＧＲクーラー４
４が設けられている。ＥＧＲクーラー４４は、冷却水に
よる熱交換器である。On the other hand, this internal combustion engine has an EGR device for reducing NO x (nitrogen oxide), and circulates exhaust gas between the exhaust passage 30 and the intake passage 20. EGR passage 40 is provided. The gas recirculation amount corresponds to E
It is adjusted by the GR valve 42. Further, the EGR passage 4
0, an EGR cooler 4 for cooling the EGR gas
4 are provided. The EGR cooler 44 is a heat exchanger using cooling water.
【００１５】ところで、前述したように、ＥＧＲクーラ
ーにおいては、図２（Ａ）に示されるように、ガス温度
が低下してミスト発生限界を下回るため、ガスがミスト
状になり、クーラーの内部に付着して、クーラーが詰ま
るという問題がある。そこで、本発明においては、図１
に示されるように、ＥＧＲクーラー４４より上流側のＥ
ＧＲ通路にＥＧＲガス用コンプレッサ４６を設け、そこ
でＥＧＲクーラー４４に入るガス温度を一時的に上昇さ
せるようにしている。その結果、図２（Ｂ）に示される
ように、ＥＧＲクーラー４４の内部においてガス温度が
ミスト発生限界を下回ることがなくなり、ＥＧＲクーラ
ー４４でのミストの発生を抑制することができる。By the way, as described above, in the EGR cooler, as shown in FIG. 2 (A), the gas temperature drops below the mist generation limit, so that the gas becomes mist-like, There is a problem that the cooler is stuck due to adhesion. Therefore, in the present invention, FIG.
As shown in the figure, E on the upstream side of the EGR cooler 44
An EGR gas compressor 46 is provided in the GR passage, where the gas temperature entering the EGR cooler 44 is temporarily increased. As a result, as shown in FIG. 2B, the gas temperature does not fall below the mist generation limit inside the EGR cooler 44, and the generation of mist in the EGR cooler 44 can be suppressed.
【００１６】そして、ＥＧＲクーラー４４より下流側の
ＥＧＲ通路にはＥＧＲガス用タービン４８が設けられて
おり、ＥＧＲクーラー４４から出たガスはそのタービン
４８によって膨張せしめられる。その結果、図２（Ｂ）
に示されるように、圧縮に伴うガス温度の上昇分だけ、
ＥＧＲガスを冷却することができる。なお、タービン４
８は、高速回転するため、詰まることはない。An EGR gas turbine 48 is provided in an EGR passage downstream of the EGR cooler 44, and gas discharged from the EGR cooler 44 is expanded by the turbine 48. As a result, FIG.
As shown in the figure, only the increase in gas temperature due to compression,
The EGR gas can be cooled. The turbine 4
8 does not clog because it rotates at a high speed.
【００１７】このように、ＥＧＲクーラー４４における
ミストの発生を防止するためにコンプレッサ４６により
圧縮されたガス温度上昇分は、タービン４８にてガスが
膨張せしめられてガス温度が低下することにより相殺さ
れるため、結果としてＥＧＲクーラー４４で冷却された
形でのＥＧＲガスが吸気通路２０に還流せしめられるこ
ととなり、内燃機関の体積効率を向上させることがで
き、出力、燃費、排出ガス浄化性能等の改善が図られ
る。そして、同軸に設けたタービン４８とコンプレッサ
４６とを駆動手段５０により機械的に駆動すると、ＥＧ
Ｒガスを積極的に流すことができるようになるため、吸
気絞りや排気絞りを利用しなくても大量にＥＧＲを導入
することができるようになる。As described above, the increase in the gas temperature compressed by the compressor 46 in order to prevent the generation of mist in the EGR cooler 44 is offset by the gas being expanded by the turbine 48 to lower the gas temperature. As a result, the EGR gas cooled in the EGR cooler 44 is recirculated to the intake passage 20, so that the volumetric efficiency of the internal combustion engine can be improved, and the output, fuel consumption, exhaust gas purification performance, etc. Improvement is achieved. Then, when the turbine 48 and the compressor 46 provided coaxially are mechanically driven by the driving means 50, the EG
Since the R gas can be made to flow positively, a large amount of EGR can be introduced without using an intake throttle or an exhaust throttle.
【００１８】図３は、ＥＧＲガス用のコンプレッサ４６
及びタービン４８の駆動手段５０の第１実施形態を示す
図であり、この実施形態では、内燃機関の回転系（カム
シャフト、タイミングベルト、プーリーなど）を利用し
てコンプレッサ４６及びタービン４８が駆動せしめられ
る。また、図４は、駆動手段５０の第２実施形態を示す
図であり、この実施形態では、排気ガスの力を利用すべ
く、過給機（タービン３４及びコンプレッサ２４）の回
転を利用してコンプレッサ４６及びタービン４８が駆動
せしめられる。FIG. 3 shows a compressor 46 for EGR gas.
FIG. 2 is a diagram showing a first embodiment of a driving unit 50 of a turbine 48, and in this embodiment, a compressor 46 and a turbine 48 are driven by using a rotation system (a camshaft, a timing belt, a pulley, etc.) of an internal combustion engine. Can be FIG. 4 is a view showing a second embodiment of the driving means 50. In this embodiment, in order to use the power of the exhaust gas, the rotation of the supercharger (turbine 34 and compressor 24) is used. The compressor 46 and the turbine 48 are driven.
【００１９】また、図５は、駆動手段５０の第３実施形
態を示す図であり、この実施形態では、内燃機関と独立
した機関であるモーターによってコンプレッサ４６及び
タービン４８が駆動せしめられる。さらに、図６は、駆
動手段５０の第４実施形態を示す図であり、この実施形
態では、内燃機関の潤滑系を利用すべく、オイルジェッ
トの力によってコンプレッサ４６及びタービン４８が駆
動せしめられる。FIG. 5 is a diagram showing a third embodiment of the driving means 50. In this embodiment, the compressor 46 and the turbine 48 are driven by a motor which is an engine independent of the internal combustion engine. FIG. 6 is a view showing a fourth embodiment of the driving means 50. In this embodiment, the compressor 46 and the turbine 48 are driven by the oil jet force in order to utilize the lubrication system of the internal combustion engine.
【００２０】ところで、ＥＧＲは排気圧と吸気圧との圧
力差を利用して排気ガスを吸気中に再循環させるもので
あるが、ＥＧＲ通路中に設けられるＥＧＲクーラー４４
は通気抵抗として作用しその圧力差を減少させるもので
ある。そのため、その圧力損失を補償すべく、図１の実
施形態においては、ＥＧＲ通路４０が、過給機のタービ
ン３４より下流側の排気通路と、過給機のコンプレッサ
２４より上流側の吸気通路と、を連通するものとなって
いる。過給機のタービン３４の下流側は上流側よりも圧
力が低下するが、過給機のコンプレッサ２４より上流側
の吸気通路はほぼ大気圧に近い低圧力であるため、圧力
差は充分である。したがって、吸気圧が高くなる高負荷
運転領域においてもＥＧＲを実施することが可能とな
る。The EGR utilizes the pressure difference between the exhaust pressure and the intake pressure to recirculate the exhaust gas into the intake air. The EGR cooler 44 provided in the EGR passage is provided.
Acts as a ventilation resistance to reduce the pressure difference. Therefore, in order to compensate for the pressure loss, in the embodiment of FIG. 1, the EGR passage 40 has an exhaust passage downstream of the turbocharger turbine 34 and an intake passage upstream of the compressor 24 of the supercharger. , Is communicated. Although the pressure on the downstream side of the turbocharger turbine 34 is lower than that on the upstream side, the pressure difference is sufficient because the intake passage on the upstream side of the compressor 24 of the supercharger is at a low pressure close to the atmospheric pressure. . Therefore, EGR can be performed even in a high load operation region where the intake pressure is high.
【００２１】さらに、図１の実施形態においては、ＥＧ
Ｒ通路４０が、ＤＰＦ３６より下流側の排気通路と、過
給機のコンプレッサ２４より上流側の吸気通路と、を連
通するものとなっている。したがって、浄化されたＥＧ
Ｒガスが還流せしめられることとなり、ＥＧＲ弁４２の
詰まり、ＥＧＲクーラー４４の詰まり、過給機のコンプ
レッサ２４の詰まり、内燃機関内部の汚れ、等が防止さ
れる。Further, in the embodiment shown in FIG.
The R passage 40 communicates an exhaust passage downstream of the DPF 36 with an intake passage upstream of the compressor 24 of the supercharger. Therefore, the purified EG
Since the R gas is recirculated, clogging of the EGR valve 42, clogging of the EGR cooler 44, clogging of the compressor 24 of the supercharger, contamination of the internal combustion engine, and the like are prevented.
【００２２】[0022]
【発明の効果】以上説明したように、本発明によれば、
ＥＧＲクーラーにおけるミストの発生が抑制されるとと
もに、排気圧と吸気圧との圧力差が確保されて高負荷域
まで含めた広い運転領域において大量のＥＧＲの実施が
可能となり、更には清浄なＥＧＲガスが還流して詰まり
等が防止される。As described above, according to the present invention,
The generation of mist in the EGR cooler is suppressed, and a pressure difference between the exhaust pressure and the intake pressure is secured, so that a large amount of EGR can be performed in a wide operating region including a high load region. Reflux and clogging is prevented.
【図１】本発明によるＥＧＲ装置を備えた内燃機関の全
体概要図である。FIG. 1 is an overall schematic diagram of an internal combustion engine provided with an EGR device according to the present invention.
【図２】（Ａ）従来のＥＧＲ装置の場合と（Ｂ）本発明
によるＥＧＲ装置の場合とについて、ＥＧＲガス温度の
変化の様子を示す図である。FIG. 2 is a diagram showing how EGR gas temperature changes in (A) a conventional EGR device and (B) an EGR device according to the present invention.
【図３】ＥＧＲガス用コンプレッサ及びタービンの駆動
手段の第１実施形態を示す図である。FIG. 3 is a diagram showing a first embodiment of a driving means for an EGR gas compressor and a turbine.
【図４】ＥＧＲガス用コンプレッサ及びタービンの駆動
手段の第２実施形態を示す図である。FIG. 4 is a view showing a second embodiment of a driving means for an EGR gas compressor and a turbine.
【図５】ＥＧＲガス用コンプレッサ及びタービンの駆動
手段の第３実施形態を示す図である。FIG. 5 is a view showing a third embodiment of a drive unit for an EGR gas compressor and a turbine.
【図６】ＥＧＲガス用コンプレッサ及びタービンの駆動
手段の第４実施形態を示す図である。FIG. 6 is a view showing a fourth embodiment of a driving means for an EGR gas compressor and a turbine.
１０…ディーゼル機関本体 ２０…吸気通路 ２２…エアクリーナ ２４…過給機のコンプレッサ ２６…インタクーラ ２８…吸気マニホルド ３０…排気通路 ３２…排気マニホルド ３４…過給機のタービン ３６…ディーゼルパティキュレートフィルタ（ＤＰＦ） ４０…ＥＧＲ通路 ４２…ＥＧＲ弁 ４４…ＥＧＲクーラー ４６…ＥＧＲガス用コンプレッサ ４８…ＥＧＲガス用タービン ５０…駆動手段 DESCRIPTION OF SYMBOLS 10 ... Diesel engine main body 20 ... Intake passage 22 ... Air cleaner 24 ... Supercharger compressor 26 ... Intercooler 28 ... Intake manifold 30 ... Exhaust passage 32 ... Exhaust manifold 34 ... Turbocharger turbine 36 ... Diesel particulate filter (DPF) 40 EGR passage 42 EGR valve 44 EGR cooler 46 EGR gas compressor 48 EGR gas turbine 50 Drive means
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０２Ｄ 21/08 ３１１ Ｆ０２Ｄ 21/08 ３１１Ｂ (72)発明者 大坪 康彦 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 清水 定信 愛知県刈谷市豊田町２丁目１番地 株式会 社豊田自動織機製作所内 Ｆターム(参考） 3G005 DA02 EA14 FA05 FA35 GB15 GB26 HA12 HA13 JA13 JA16 3G062 AA01 AA03 AA05 EA00 ED01 ED04 ED08 ED10 3G092 AA02 AA13 AA17 AA18 DC09 DF02 FA17 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F02D 21/08 311 F02D 21/08 311B (72) Inventor Yasuhiko Otsubo 1st Toyota Town, Toyota City, Aichi Prefecture Toyota Auto (72) Inventor Sadanobu Shimizu 2-1-1 Toyota-cho, Kariya-shi, Aichi F-term in Toyota Industries Corporation (reference) 3G005 DA02 EA14 FA05 FA35 GB15 GB26 HA12 HA13 JA13 JA16 3G062 AA01 AA03 AA05 EA00 ED01 ED04 ED08 ED10 3G092 AA02 AA13 AA17 AA18 DC09 DF02 FA17
Claims (3)
する冷却手段と、 前記冷却手段より上流側のＥＧＲ通路に設けられＥＧＲ
ガスを圧縮するＥＧＲガス用コンプレッサと、 前記冷却手段より下流側のＥＧＲ通路に設けられＥＧＲ
ガスを膨張させるＥＧＲガス用タービンと、 前記ＥＧＲガス用コンプレッサ及び前記ＥＧＲガス用タ
ービンを駆動する駆動手段と、 を具備する、内燃機関のＥＧＲ装置。1. A cooling means provided in an EGR passage for cooling EGR gas, and an EGR provided in an EGR passage upstream of the cooling means.
An EGR gas compressor for compressing gas; and an EGR gas provided in an EGR passage downstream of the cooling means.
An EGR device for an internal combustion engine, comprising: an EGR gas turbine that expands gas; and a driving unit that drives the EGR gas compressor and the EGR gas turbine.
流側の排気通路と、過給機のコンプレッサより上流側の
吸気通路と、を連通するものである、請求項１に記載の
内燃機関のＥＧＲ装置。2. The internal combustion engine according to claim 1, wherein the EGR passage communicates an exhaust passage downstream of the turbine of the supercharger with an intake passage upstream of the compressor of the supercharger. EGR device.
タより下流側の排気通路と、過給機のコンプレッサより
上流側の吸気通路と、を連通するものである、請求項１
に記載の内燃機関のＥＧＲ装置。3. An EGR passage which communicates an exhaust passage downstream of a particulate filter with an intake passage upstream of a compressor of a supercharger.
An EGR device for an internal combustion engine according to claim 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000275428A JP2002089375A (en) | 2000-09-11 | 2000-09-11 | EGR device for internal combustion engine |
| EP01121561A EP1186767A3 (en) | 2000-09-11 | 2001-09-10 | Exhaust gas recirculation system for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000275428A JP2002089375A (en) | 2000-09-11 | 2000-09-11 | EGR device for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002089375A true JP2002089375A (en) | 2002-03-27 |
Family
ID=18761050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000275428A Pending JP2002089375A (en) | 2000-09-11 | 2000-09-11 | EGR device for internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1186767A3 (en) |
| JP (1) | JP2002089375A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005003536A1 (en) * | 2003-07-01 | 2005-01-13 | Tokudaiji Institute Of Automotive Culture Inc. | Diesel engine exhaust gas purifier and control means |
| JP2010048107A (en) * | 2008-08-19 | 2010-03-04 | Fuji Heavy Ind Ltd | Exhaust gas recirculation device for diesel engine |
| WO2012063718A1 (en) * | 2010-11-09 | 2012-05-18 | 三菱重工業株式会社 | Engine exhaust gas purification device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6422219B1 (en) * | 2000-11-28 | 2002-07-23 | Detroit Diesel Corporation | Electronic controlled engine exhaust treatment system to reduce NOx emissions |
| FR2840648B1 (en) * | 2002-06-11 | 2006-08-04 | Inst Francais Du Petrole | DEVICE AND METHOD FOR CONTROLLING EXHAUST GAS RECIRCULATION FOR AN INTERNAL COMBUSTION ENGINE, IN PARTICULAR OF THE DIESEL TYPE |
| AU2003294261A1 (en) | 2002-11-13 | 2004-06-03 | Honeywell International Inc. | Dual and hybrid egr systems for use with turbocharged engine |
| US7013879B2 (en) * | 2003-11-17 | 2006-03-21 | Honeywell International, Inc. | Dual and hybrid EGR systems for use with turbocharged engine |
| DE102004061028B4 (en) * | 2004-12-18 | 2014-10-23 | Pierburg Gmbh | Exhaust gas recirculation system |
| US7296403B2 (en) | 2005-11-03 | 2007-11-20 | Ford Global Technologies, Llc | Dual walled particular filter for transporting filtered exhaust to a compressor of a diesel engine turbocharger |
| US7571608B2 (en) * | 2005-11-28 | 2009-08-11 | General Electric Company | Turbocharged engine system and method of operation |
| EP1870590A1 (en) * | 2006-06-22 | 2007-12-26 | C.R.F. Società Consortile per Azioni | Internal combustion engine with a pump for exhaust gas recirculation |
| US8176736B2 (en) | 2008-03-21 | 2012-05-15 | Cummins Inc. | EGR apparatuses, systems, and methods |
| DE102008018583A1 (en) | 2008-04-12 | 2009-10-22 | Pierburg Gmbh | Exhaust gas recirculation system for an internal combustion engine |
| GB2459694B (en) * | 2008-05-01 | 2012-04-25 | Ford Global Tech Llc | Exhaust gas recirculation |
| US8640457B2 (en) * | 2009-10-13 | 2014-02-04 | General Electric Company | System and method for operating a turbocharged engine |
| JP5357720B2 (en) * | 2009-11-27 | 2013-12-04 | 三菱重工業株式会社 | Ships equipped with exhaust gas treatment equipment |
| DE102015208957A1 (en) * | 2015-05-15 | 2016-11-17 | Ford Global Technologies, Llc | Self-igniting internal combustion engine with turbocharging and exhaust gas recirculation |
| US9989020B2 (en) | 2015-05-15 | 2018-06-05 | Ford Global Technologies, Llc | Auto-ignition internal combustion engine with exhaust-gas turbocharging and exhaust-gas recirculation |
| US10995657B2 (en) * | 2017-12-20 | 2021-05-04 | John Manley McDonald | Externally powered turbine for an internal combustion engine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3005776B2 (en) * | 1991-09-10 | 2000-02-07 | ヤンマーディーゼル株式会社 | Exhaust gas recirculation system for diesel engine |
| SE506125C2 (en) * | 1994-12-08 | 1997-11-10 | Scania Cv Ab | Arrangements for redirecting exhaust gases in supercharged engines with parallel turbines |
| JP2798901B2 (en) * | 1995-07-27 | 1998-09-17 | 株式会社ディーゼルユナイテッド | Exhaust gas recirculation device |
| DE19603591C1 (en) * | 1996-02-01 | 1997-03-06 | Daimler Benz Ag | Exhaust gas feedback system for turbocharged internal combustion engines |
-
2000
- 2000-09-11 JP JP2000275428A patent/JP2002089375A/en active Pending
-
2001
- 2001-09-10 EP EP01121561A patent/EP1186767A3/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005003536A1 (en) * | 2003-07-01 | 2005-01-13 | Tokudaiji Institute Of Automotive Culture Inc. | Diesel engine exhaust gas purifier and control means |
| JP2010048107A (en) * | 2008-08-19 | 2010-03-04 | Fuji Heavy Ind Ltd | Exhaust gas recirculation device for diesel engine |
| WO2012063718A1 (en) * | 2010-11-09 | 2012-05-18 | 三菱重工業株式会社 | Engine exhaust gas purification device |
| JP2012102651A (en) * | 2010-11-09 | 2012-05-31 | Mitsubishi Heavy Ind Ltd | Engine exhaust gas purification device |
| EP2639440A4 (en) * | 2010-11-09 | 2016-10-05 | Mitsubishi Heavy Ind Ltd | DEVICE FOR PURIFYING EXHAUST GAS FROM AN ENGINE |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1186767A3 (en) | 2003-04-23 |
| EP1186767A2 (en) | 2002-03-13 |
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