JPH07238870A - Exhaust gas recirculation device of diesel engine and recirculation method of exhaust gas - Google Patents
Exhaust gas recirculation device of diesel engine and recirculation method of exhaust gasInfo
- Publication number
- JPH07238870A JPH07238870A JP6052707A JP5270794A JPH07238870A JP H07238870 A JPH07238870 A JP H07238870A JP 6052707 A JP6052707 A JP 6052707A JP 5270794 A JP5270794 A JP 5270794A JP H07238870 A JPH07238870 A JP H07238870A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- egr
- diesel engine
- soot
- gas recirculation
- 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
- F02M26/52—Systems for actuating EGR valves
- F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
- F02M26/60—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to air intake pressure
-
- 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
- F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream 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
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
- F02B29/0437—Liquid cooled heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ディーゼル機関の排気
ガス還流装置および排気ガス還流方法に係わり、特に
は、排気ガスの一部をススを除去した後に冷却して吸気
側に還流させるディーゼル機関の排気ガス還流装置およ
び排気ガス還流方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation device and a method for recirculating exhaust gas of a diesel engine, and more particularly to a diesel engine in which a portion of exhaust gas is cooled after being removed by soot and recirculated to an intake side. And an exhaust gas recirculation method for the same.
【０００２】[0002]
【従来の技術】従来、自動車等に搭載されるエンジンに
おいて、排気ガス中のＮＯX （窒素酸化物）を低減する
ために、排気ガスの一部を冷却して吸気側に還流させる
排気ガス還流（以下、ＥＧＲという。）は、特開平４−
１７５４５３号公報で知られている。また、排気ガス中
に含まれるカーボンが吸気通路の内壁面に付着して蓄積
し、更に蓄積後カーボン塊となって剥離離脱したりし
て、エンジン本体に不具合を生じさせないため、排気通
路と吸気通路の過給機の上流側を連通したＥＧＲ通路
に、ＥＧＲ熱交換器、ＥＧＲフイルタを設けるものも、
特開平４−３０１１７２号公報で知られている。2. Description of the Related Art Conventionally, in an engine mounted on an automobile or the like, in order to reduce NOx (nitrogen oxide) in the exhaust gas, exhaust gas recirculation (cooling a part of the exhaust gas and returning it to the intake side) (Hereinafter referred to as EGR)).
It is known from Japanese Patent No. 175453. In addition, the carbon contained in the exhaust gas adheres and accumulates on the inner wall surface of the intake passage, and after the accumulation, carbon lumps are separated and separated, which does not cause a malfunction in the engine body. The one in which the EGR heat exchanger and the EGR filter are provided in the EGR passage communicating with the upstream side of the supercharger of the passage,
It is known from Japanese Patent Laid-Open No. 4-301172.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、排気ガ
スの一部を冷却して吸気側に還流させて排気ガス中のＮ
ＯX を低減しても、ディーゼル機関用の燃料は脱硫処理
がされていないために、燃料の中に硫黄（サルファＳ）
が含まれているために排ガス、即ち、ＥＧＲガス中には
ＳＯ2 が含まれる外に、ススも混入している。これらの
ＥＧＲガスをディーゼル機関内部に入れるとＳＯ2 が酸
化されてＳＯ3 となり、水と反応して硫酸（Ｈ2 Ｓ
Ｏ4 ）となり、ピストンリングとシリンダーライナの間
からオイルパンに落下して潤滑油に入る。このＨ2 ＳＯ
4 ＋潤滑油の成分Ｃａ（ＯＨ）2 が反応してＣａＳＯ4
となる。このとき、硫酸によるシリンダライナ、ピスト
ンリングの腐食磨耗、および、オイル中和によりアルカ
リ価が低下し、タペット、カムシャフト等の潤滑を阻害
し、ディーゼル機関の耐久性が損なわれる。また、ディ
ーゼル機関においては、ＥＧＲ通路に順次にＥＧＲ冷却
器とＥＧＲフイルタを付けた場合に、ＥＧＲ冷却器で生
ずる水により上記と同様に硫酸（Ｈ2 ＳＯ4 ）が発生
し、ＥＧＲフイルタが侵されて耐久性が損なわれるとと
もに、排気ガス中のススがＥＧＲ冷却器に溜まり冷却効
率が低下するという問題が発生している。However, a part of the exhaust gas is cooled and recirculated to the intake side so that N in the exhaust gas is returned.
Even if OX is reduced, the fuel for diesel engines is not desulfurized, so sulfur (Sulfa S) is contained in the fuel.
In addition to SO 2 being contained in the exhaust gas, that is, EGR gas, soot is also mixed in because of the inclusion of SO 2 . When these EGR gases are introduced into the diesel engine, SO 2 is oxidized to SO 3 and reacts with water to generate sulfuric acid (H 2 S
O 4 ) and falls into the oil pan from between the piston ring and the cylinder liner and enters the lubricating oil. This H 2 SO
4 + Ca (OH) 2 component of lubricating oil reacts and CaSO 4
Becomes At this time, the corrosion and abrasion of the cylinder liner and the piston ring due to sulfuric acid and the neutralization of the oil lower the alkali value, which hinders the lubrication of the tappet, the camshaft and the like, and the durability of the diesel engine is impaired. Further, in a diesel engine, when an EGR cooler and an EGR filter are sequentially attached to the EGR passage, sulfuric acid (H 2 SO 4 ) is generated by the water generated in the EGR cooler in the same manner as above and the EGR filter is invaded. As a result, the durability is impaired, and soot in the exhaust gas accumulates in the EGR cooler, which lowers the cooling efficiency.
【０００４】本発明は上記従来の問題点に着目し、ディ
ーゼル機関の排気ガス還流装置および排気ガス還流方法
に係わり、特には、排気ガスの一部をススを除去した後
に冷却するとともに、水分も除去して還流し、冷却効率
の低下を防ぎ、かつ、ディーゼル機関の耐久性が向上す
るディーゼル機関の排気ガス還流装置および排気ガス還
流方法の改良の提供を目的とする。The present invention focuses on the above-mentioned conventional problems, and relates to an exhaust gas recirculation device and an exhaust gas recirculation method for a diesel engine, and in particular, a part of the exhaust gas is cooled after removing soot and moisture is also removed. An object of the present invention is to provide an exhaust gas recirculation device for a diesel engine and an exhaust gas recirculation method, which remove and recirculate the gas to prevent a reduction in cooling efficiency and improve the durability of the diesel engine.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明のディーゼル機関の排気ガス還流装置および
その制御方法の第１発明では、ディーゼル機関の負荷に
応じて排気ガスの一部を吸気側に還流させるとともに、
吸気側に還流させるガスを冷却し、かつ、ススを除去し
て吸気側に還流させるディーゼル機関において、排気ガ
ス還流回路上流側から順次に、ディーゼル機関の負荷に
応じて還流させる量を設定するＥＧＲ率調量用バルブ、
還流させる排気ガスのススを除去するＥＧＲフィルタ、
ススを除去したガスを冷却し、かつ水分を除去する水分
除去付ＥＧＲ熱交換器を配置したことを特徴とする。In order to achieve the above object, in the first invention of the exhaust gas recirculation system for a diesel engine and the control method thereof according to the present invention, a part of the exhaust gas is discharged according to the load of the diesel engine. While returning to the intake side,
In a diesel engine that cools the gas that recirculates to the intake side and removes soot and recirculates it to the intake side, an EGR that sequentially sets the amount of recirculation according to the load of the diesel engine from the upstream side of the exhaust gas recirculation circuit Valve for rate adjustment,
An EGR filter for removing soot of exhaust gas to be recirculated,
It is characterized in that an EGR heat exchanger with water removal is arranged to cool the gas from which soot has been removed and remove water.
【０００６】第１発明を主体とする第２発明では、排気
ガス還流回路の上流側の取り出し位置をディーゼル機関
と過給機との間に配置している。In the second invention, which is mainly based on the first invention, the take-out position on the upstream side of the exhaust gas recirculation circuit is arranged between the diesel engine and the supercharger.
【０００７】第１発明を主体とする第３発明では、水分
除去付ＥＧＲ熱交換器はＥＧＲ冷却器の下方に水抜きタ
ンクを設けたディーゼル機関の排気ガス還流装置。According to a third aspect of the invention, which is mainly based on the first aspect, the EGR heat exchanger with water removal is an exhaust gas recirculation system for a diesel engine in which a drainage tank is provided below the EGR cooler.
【０００８】第３発明を主体とする第４発明では、水抜
きタンク又はドレン配管の途中に酸性の水を中和する中
和剤層を設けている。In the fourth invention mainly composed of the third invention, a neutralizing agent layer for neutralizing acidic water is provided in the middle of the drain tank or the drain pipe.
【０００９】第５発明では、排気ガスの一部を吸気側に
還流させる排気ガス還流回路を設け、排気ガス還流回路
でススを除去し、かつ、冷却して吸気側に還流させるデ
ィーゼル機関において、熱交換器の冷却効率を維持する
ため排気ガス還流回路上流側で排気ガスのススを除去
し、その後に排気ガスを冷却することを特徴とする。According to the fifth aspect of the invention, an exhaust gas recirculation circuit for recirculating a part of exhaust gas to the intake side is provided, soot is removed in the exhaust gas recirculation circuit, and the diesel engine is cooled to recirculate to the intake side. In order to maintain the cooling efficiency of the heat exchanger, the soot of the exhaust gas is removed on the upstream side of the exhaust gas recirculation circuit, and then the exhaust gas is cooled.
【００１０】第６の発明では、排気ガスの一部を吸気側
に還流させる排気ガス還流回路を設け、排気ガス還流回
路にススを除去し、かつ、冷却して吸気側に還流させる
ディーゼル機関において、吸気側に還流させる排気ガス
中の酸性の水分を低減してから還流させることを特徴と
する。According to a sixth aspect of the present invention, there is provided an exhaust gas recirculation circuit for recirculating a part of exhaust gas to the intake side, soot is removed from the exhaust gas recirculation circuit, and the diesel engine is cooled to recirculate to the intake side. It is characterized in that the acidic water in the exhaust gas to be recirculated to the intake side is reduced before the recirculation.
【００１１】[0011]
【作用】上記構成によれば、ディーゼル機関において、
ＥＧＲ回路に順次にＥＧＲフイルタとＥＧＲ熱交換器と
を配置しているので、ススがＥＧＲ熱交換器に溜まり冷
却効率を低下する恐れがない。また、ＥＧＲ熱交換器を
後方に配置しているのでＥＧＲフイルタが硫酸により侵
されることなく耐久性が向上し、さらに、ＥＧＲ熱交換
器に水抜きタンクを設けているので、ＥＧＲ熱交換器で
生ずる水により上記と同様に硫酸（Ｈ2 ＳＯ4 ）が発生
しても水抜きタンクに溜まり、ディーゼル機関内に水と
Ｈ2 ＳＯ4 が入らない。従って、タペット、カムシャフ
ト等も損なうことなく、ディーゼル機関の耐久性は向上
する。また、水抜きタンク又はドレン配管の途中に中和
剤層を設けているために、環境破壊を防止できる。According to the above construction, in the diesel engine,
Since the EGR filter and the EGR heat exchanger are sequentially arranged in the EGR circuit, there is no fear that soot accumulates in the EGR heat exchanger and cooling efficiency is reduced. Further, since the EGR heat exchanger is arranged at the rear, durability is improved without the EGR filter being attacked by sulfuric acid. Furthermore, since the EGR heat exchanger is provided with a drain tank, the EGR heat exchanger is Even if sulfuric acid (H 2 SO 4 ) is generated due to the generated water, it is stored in the drain tank, and water and H 2 SO 4 do not enter the diesel engine. Therefore, the durability of the diesel engine is improved without damaging the tappet and the camshaft. Further, since the neutralizing agent layer is provided in the middle of the drainage tank or the drain pipe, environmental damage can be prevented.
【００１２】[0012]
【実施例】以下に、本発明に係わるディーゼル機関の排
気ガス還流装置および排気ガス還流方法につき、図面を
参照して詳細に説明する。図１は本発明のディーゼル機
関の排気ガス還流装置の一実施例の全体システム図を示
す。図１において、ディーゼル機関１０への空気供給回
路（図１の実線の矢印Ａで示す。）には、吸気フィルタ
１１から過給機１２のブロア１２ａ、および、インター
クーラ１３が配設され、供給空気は吸気フィルタ１１で
空気中のゴミが除去された後に、ブロア１２ａで加圧さ
れ、インタークーラ１３で冷却されてディーゼル機関１
０のシリンダ室１０ａに送られている。インタークーラ
１３には冷却水用の冷却水配管１４が連結されている。
また、インタークーラ１３からの冷却水配管１４は後述
する水分除去付ＥＧＲガス熱交換器３０に接続されてい
る。このとき、インタークーラ１３と水分除去付ＥＧＲ
ガス熱交換器３０への配管は別々の冷却水から取っても
良い。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An exhaust gas recirculation system for a diesel engine and an exhaust gas recirculation method according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an overall system diagram of an embodiment of an exhaust gas recirculation system for a diesel engine of the present invention. In FIG. 1, an air supply circuit (indicated by a solid arrow A in FIG. 1) to the diesel engine 10 is provided with a blower 12a of the supercharger 12 from the intake filter 11 and an intercooler 13 to supply the air. After the dust in the air is removed by the intake filter 11, the air is pressurized by the blower 12a and cooled by the intercooler 13, and the diesel engine 1
0 is sent to the cylinder chamber 10a. A cooling water pipe 14 for cooling water is connected to the intercooler 13.
The cooling water pipe 14 from the intercooler 13 is connected to an EGR gas heat exchanger 30 with water removal, which will be described later. At this time, the intercooler 13 and EGR with water removal
The pipes to the gas heat exchanger 30 may be taken from separate cooling waters.
【００１３】ディーゼル機関１０からの排ガスの排気回
路（図１の点線矢印Ｂで示す。）には、過給機１２のタ
ービン１２ｂと、排気マフラ１５とが配設されている。
また、空気供給回路と排ガスの排気回路との間のＥＧＲ
回路（図１の一点鎖線の矢印Ｃで示す。）には、ＥＧＲ
率調量用バルブ２１と、ＥＧＲフィルタ２２と、水分除
去付ＥＧＲガス熱交換器３０とが配設されている。ＥＧ
Ｒ回路と排気回路との接続位置Ｅは排気回路のディーゼ
ル機関１０とタービン１２ｂとの間にあり、ＥＧＲ回路
と空気供給回路との接続位置Ｆは空気供給回路の吸気フ
ィルタ１１とブロア１２ａとの間にある。A turbine 12b of a supercharger 12 and an exhaust muffler 15 are arranged in an exhaust circuit for exhaust gas from the diesel engine 10 (shown by a dotted arrow B in FIG. 1).
In addition, the EGR between the air supply circuit and the exhaust gas exhaust circuit
The circuit (indicated by the one-dot chain line arrow C in FIG. 1) has EGR.
A rate adjusting valve 21, an EGR filter 22, and an EGR gas heat exchanger 30 with water removal are arranged. EG
The connection position E between the R circuit and the exhaust circuit is between the diesel engine 10 and the turbine 12b in the exhaust circuit, and the connection position F between the EGR circuit and the air supply circuit is between the intake filter 11 and the blower 12a in the air supply circuit. between.
【００１４】ＥＧＲ回路のＥＧＲ率調量用バルブ２１で
は、ディーゼル機関１０の負荷に応じて空気供給側に戻
すＥＧＲガス量を調整してＥＧＲフィルタ２２に送り、
ＥＧＲフィルタ２２では排気ガス中のススを除去する。
水分除去付ＥＧＲガス熱交換器３０では、空気供給回路
に供給する排気ガスを冷却するとともに、排気ガスから
冷却時に生ずる水を除去して空気供給回路に入らないよ
うにしている。The EGR rate adjustment valve 21 of the EGR circuit adjusts the amount of EGR gas returned to the air supply side according to the load of the diesel engine 10 and sends it to the EGR filter 22.
The EGR filter 22 removes soot in the exhaust gas.
In the EGR gas heat exchanger 30 with water removal, the exhaust gas supplied to the air supply circuit is cooled, and the water generated during cooling is removed from the exhaust gas so as not to enter the air supply circuit.
【００１５】次に、水分除去付ＥＧＲガス熱交換器３０
について説明する。図２は水分除去付ＥＧＲガス熱交換
器３０の第１実施例であり、水分除去付ＥＧＲガス熱交
換器３０は排気ガス冷却器３１と水抜きタンク３２とか
らなり、排気ガス冷却器３１にＥＧＲフィルタ２２を経
た排気ガスからの配管３３が接続されるとともに、冷却
された排気ガスが水抜きタンク３２に出ていく配管３６
が排気ガス冷却器３１の下方に接続されている。また、
排気ガス冷却器３１には冷却水の配管３４、３５が接続
されている。水抜きタンク３２からは空気供給回路の接
続位置Ｆへの配管３７が配設されている。Next, the EGR gas heat exchanger 30 with water removal
Will be described. FIG. 2 shows a first embodiment of the EGR gas heat exchanger 30 with water removal. The EGR gas heat exchanger 30 with water removal is composed of an exhaust gas cooler 31 and a water drain tank 32. A pipe 33 from the exhaust gas that has passed through the EGR filter 22 is connected, and a pipe 36 through which the cooled exhaust gas flows out to the water drain tank 32.
Are connected below the exhaust gas cooler 31. Also,
Cooling water pipes 34 and 35 are connected to the exhaust gas cooler 31. A pipe 37 is provided from the water drain tank 32 to the connection position F of the air supply circuit.
【００１６】上記において、ディーゼル機関１０からの
ＳＯX 、ＮＯXが含まれた排気ガスは、排気ガス冷却器
３１で冷却されて結露水が発生し、この結露水とＳＯX
あるいはＮＯX が反応して、硝酸あるいは硫酸となって
落下し、この硫酸あるいは硝酸は排気ガス冷却器３１の
下方の配管３６から水抜きタンク３２に出ていき、水抜
きタンク３２に溜まる。これにより、水抜きタンク３２
から空気供給回路の接続位置Ｆへ出ていく配管３７中に
は硝酸あるいは硫酸が含まれておらず、また、水分も少
なくなっている。In the above, the exhaust gas containing SOX and NOX from the diesel engine 10 is cooled by the exhaust gas cooler 31 to generate dew condensation water.
Alternatively, NOX reacts and drops as nitric acid or sulfuric acid, and this sulfuric acid or nitric acid flows out from the pipe 36 below the exhaust gas cooler 31 to the water draining tank 32 and accumulates in the water draining tank 32. As a result, the drain tank 32
The nitric acid or sulfuric acid is not contained in the pipe 37 that goes out to the connection position F of the air supply circuit from the air supply circuit, and the water content is low.
【００１７】図３は水分除去付ＥＧＲガス熱交換器４０
の第２実施例であり、構成は第１実施例とほぼ同じであ
り、同一部品には同一符号を付しているが、第１実施例
とは次の点が相違している。排気ガス冷却器４１から冷
却された排気ガスが水抜きタンク３２に出ていく配管４
４が排気ガス冷却器４１の横から出ている。また、排気
ガス冷却器４１と水抜きタンク３２との間には、水を水
抜きタンク３２に送る配管４５が排気ガス冷却器４１の
下方から出ている。FIG. 3 shows an EGR gas heat exchanger 40 with water removal.
The second embodiment of the present invention has the same configuration as that of the first embodiment, and the same parts are designated by the same reference numerals, but are different from the first embodiment in the following points. Piping 4 in which the exhaust gas cooled from the exhaust gas cooler 41 flows out to the water drain tank 32
4 is coming out from the side of the exhaust gas cooler 41. Further, between the exhaust gas cooler 41 and the water draining tank 32, a pipe 45 for sending water to the water draining tank 32 extends from below the exhaust gas cooler 41.
【００１８】なお、排気ガスの流れは第１実施例と同様
なため説明は省略するが、結露水とＳＯX あるいはＮＯ
X が反応して落下する硝酸あるいは硫酸は専用の配管４
５を通って水抜きタンク３２に出ていき、水抜きタンク
３２に溜まる。The flow of the exhaust gas is the same as in the first embodiment, so its explanation is omitted. However, the condensed water and SOX or NO
Dedicated pipe 4 for nitric acid or sulfuric acid that X reacts and drops
It goes out to the drainage tank 32 through 5 and collects in the drainage tank 32.
【００１９】図４はＥＧＲガス熱交換器３０又は４０に
配設されている水抜きタンク３２の実施例の水抜きタン
ク５１であり、中和剤５２が挿入されているとともに、
下方からドレン用の配管５３が設けられている点が異な
る。また、中和剤はドレン配管の途中にあっても良い。
上記において、水抜きタンク５１に溜まった硝酸ある
いは硫酸は中和浄化され、中和された水は所定の時期に
排水される。FIG. 4 shows a drainage tank 51 of an embodiment of the drainage tank 32 arranged in the EGR gas heat exchanger 30 or 40, in which a neutralizing agent 52 is inserted and
The difference is that a drain pipe 53 is provided from below. Further, the neutralizing agent may be in the middle of the drain pipe.
In the above, the nitric acid or sulfuric acid accumulated in the water removal tank 51 is neutralized and purified, and the neutralized water is drained at a predetermined time.
【００２０】図５は中和剤５２の配置の他の実施例であ
り、水抜きタンク３２の下方からドレン用の配管５３
が、このドレン用の配管５３に接続されて中和剤層のタ
ンク５５が配設され、さらに、その下にドレンコック５
６が配設されている。上記において、水抜きタンク３２
に溜まった硝酸あるいは硫酸は中和浄化され、中和され
た水は所定の時期に排水される。なお、上記実施例にお
いて、図２、図３にドレン用の配管、および、ドレンコ
ックを付設しても良いことはいうまでもない。FIG. 5 shows another embodiment of the arrangement of the neutralizing agent 52, which is a pipe 53 for draining from below the water draining tank 32.
However, the neutralizing agent layer tank 55 is connected to the drain pipe 53, and the drain cock 5 is provided under the tank 55.
6 are provided. In the above, the drainage tank 32
The nitric acid or sulfuric acid accumulated in is neutralized and purified, and the neutralized water is drained at a predetermined time. In the above embodiment, it goes without saying that the drain pipe and the drain cock may be additionally provided in FIGS.
【００２１】上記構成において次に作動について説明す
る。まず、水分を除去した排気ガスを空気供給回路に還
流するＥＧＲ回路について説明する。ＥＧＲ回路は上流
（ディーゼル機関１０のシリンダ室１０ａの排気側）よ
り順次、ＥＧＲ率調量用バルブ２１、ＥＧＲフィルタ２
２、水分除去付ＥＧＲガス熱交換器３０の排気ガス冷却
器３１、水抜きタンク３２の順で配設されている。次
に、ＥＧＲ率調量用バルブ２１は、ディーゼル機関１０
への図示しない燃料の噴射ポンプの噴射量あるいは機関
の回転速度等の信号を受けて制御装置６５からの信号に
より制御され、負荷に応じて空気供給側に戻すＥＧＲガ
ス量を調整している。ＥＧＲフィルタ２２では、ディー
ゼル機関１０にススが入らないようにフィルタで捕集す
るだけでなく、排気ガス冷却器３１の上流側に設置する
ことにより排気ガス冷却器３１にススが堆積することを
防止し、冷却効率の維持している。Next, the operation of the above structure will be described. First, the EGR circuit for returning the exhaust gas from which water has been removed to the air supply circuit will be described. The EGR circuit includes an EGR rate adjusting valve 21 and an EGR filter 2 sequentially from the upstream side (exhaust side of the cylinder chamber 10a of the diesel engine 10).
2. The exhaust gas cooler 31 of the EGR gas heat exchanger 30 with water removal and the water drain tank 32 are arranged in this order. Next, the EGR rate adjusting valve 21 is used for the diesel engine 10
Is controlled by a signal from the control device 65 in response to a signal such as an injection amount of a fuel injection pump (not shown) or a rotation speed of the engine, and the EGR gas amount returned to the air supply side is adjusted according to the load. The EGR filter 22 not only collects soot from the diesel engine 10 so that it does not enter the diesel engine 10, but also prevents the soot from accumulating in the exhaust gas cooler 31 by installing it on the upstream side of the exhaust gas cooler 31. The cooling efficiency is maintained.
【００２２】排気ガス冷却器３１により、硝酸あるいは
硫酸の結露温度以下に排気ガスを冷却し、結露水と一緒
に水抜きタンク３２に溜めてディーゼル機関１０内に、
酸性の水分を入れない。上記の各機能において、ＥＧＲ
回路の取り出し分岐点を過給機のタービン上流とし、高
圧の排気ガスを還流させることにより、ＥＧＲ率調量用
バルブ２１、ＥＧＲフィルタ２２、水分除去付ＥＧＲガ
ス熱交換器３０の排気ガス冷却器３１、水抜きタンク３
２の通気抵抗に勝ることができ、ＥＧＲガスをスムーズ
に還流できる。The exhaust gas cooler 31 cools the exhaust gas to a temperature below the dew condensation temperature of nitric acid or sulfuric acid.
Do not put acidic water. In each of the above functions, EGR
An exhaust gas cooler of an EGR rate control valve 21, an EGR filter 22, and a moisture removal EGR gas heat exchanger 30 is provided by making the take-out branch point of the circuit upstream of the turbine of the supercharger and recirculating high-pressure exhaust gas. 31, drainage tank 3
It can outperform the ventilation resistance of 2 and smoothly recirculate EGR gas.
【００２３】[0023]
【発明の効果】以上説明したように、本発明によれば、
ＥＧＲフイルタの後にＥＧＲ熱交換器を配置しているの
でススにより冷却効率の低下が防止できるとともに、冷
却により発生する硫酸によりＥＧＲフイルタが侵される
ことなくなる。また、ＥＧＲ熱交換器に水抜きタンクを
設けているので、硫酸（Ｈ2 ＳＯ4 ）が発生しても水抜
きタンクに溜まり、ディーゼル機関内にＨ2 ＳＯ4 が入
ることなくディーゼル機関の耐久性は向上する。また、
水抜きタンクに中和剤を設けているために、環境破壊も
防止できるという優れた効果が得られる。As described above, according to the present invention,
Since the EGR heat exchanger is arranged after the EGR filter, the soot can prevent the cooling efficiency from lowering and the sulfuric acid generated by the cooling will not attack the EGR filter. In addition, since the EGR heat exchanger is equipped with a water drain tank, even if sulfuric acid (H 2 SO 4 ) is generated, it will be collected in the water drain tank, and H 2 SO 4 will not enter the diesel engine, thereby ensuring durability of the diesel engine. Sex improves. Also,
Since the water removing tank is provided with the neutralizing agent, the excellent effect of preventing environmental damage can be obtained.
【図１】本発明のディーゼル機関の排気ガス還流装置の
一実施例の全体システム図を示す。FIG. 1 shows an overall system diagram of an embodiment of an exhaust gas recirculation device for a diesel engine of the present invention.
【図２】本発明の水分除去付ＥＧＲガス熱交換器３０の
第１実施例の概略図である。FIG. 2 is a schematic view of a first embodiment of an EGR gas heat exchanger with water removal 30 of the present invention.
【図３】本発明の水分除去付ＥＧＲガス熱交換器３０の
第２実施例の概略図である。FIG. 3 is a schematic diagram of a second embodiment of the EGR gas heat exchanger 30 with water removal of the present invention.
【図４】水抜きタンクの実施例の概略図である。FIG. 4 is a schematic diagram of an embodiment of a drainage tank.
【図５】水抜きタンクの他の実施例の概略図である。FIG. 5 is a schematic view of another embodiment of the water drain tank.
１０……ディーゼル機関、１１……吸気フィルタ、１２
……過給機、１３……インタークーラ、１５……排気マ
フラ、２１……ＥＧＲ率調量用バルブ、２２……ＥＧＲ
フィルタ、３０、４０……水分除去付ＥＧＲガス熱交換
器、３１、４１……排気ガス冷却器、３２、５１……水
抜きタンク、５２……中和剤層、５５……中和剤層タン
ク、５６……ドレンコック。10 ... Diesel engine, 11 ... Intake filter, 12
...... Supercharger, 13 ...... Intercooler, 15 ...... Exhaust muffler, 21 ...... EGR rate adjustment valve, 22 ...... EGR
Filter, 30, 40 ... EGR gas heat exchanger with water removal, 31, 41 ... Exhaust gas cooler, 32, 51 ... Drainage tank, 52 ... Neutralizing agent layer, 55 ... Neutralizing agent layer Tank, 56 ... Drain cock.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０２Ｆ 1/66 ５２１ Ａ ５３０ Ｂ Ｆ０２Ｂ 37/00 ３０２ Ｆ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location C02F 1/66 521 A 530 B F02B 37/00 302 F
Claims (6)
の一部を吸気側に還流させるとともに、吸気側に還流さ
せるガスを冷却し、かつ、ススを除去して吸気側に還流
させるディーゼル機関において、排気ガス還流回路上流
側から順次に、ディーゼル機関の負荷に応じて還流させ
る量を設定するＥＧＲ率調量用バルブ、還流させる排気
ガスのススを除去するＥＧＲフィルタ、ススを除去した
ガスを冷却し、かつ、水分を除去する水分除去付ＥＧＲ
熱交換器を配置したことを特徴とするディーゼル機関の
排気ガス還流装置。1. A diesel engine in which a part of exhaust gas is recirculated to the intake side according to the load of the diesel engine, and the gas recirculated to the intake side is cooled, and soot is removed to recirculate to the intake side. , EGR rate adjustment valve that sets the amount of recirculation according to the load of the diesel engine, from the upstream side of the exhaust gas recirculation circuit, EGR filter that removes soot of the exhaust gas that recirculates, cools the gas after removing soot And EGR with water removal for removing water
An exhaust gas recirculation system for a diesel engine, which is equipped with a heat exchanger.
上流側の取り出し位置をディーゼル機関と過給機との間
に配置したディーゼル機関の排気ガス還流装置。2. The exhaust gas recirculation device for a diesel engine according to claim 1, wherein an upstream side extraction position of the exhaust gas recirculation circuit is arranged between the diesel engine and the supercharger.
交換器はＥＧＲ冷却器の下方に水抜きタンクを設けたデ
ィーゼル機関の排気ガス還流装置。3. The exhaust gas recirculation system for a diesel engine according to claim 1, wherein the EGR heat exchanger with water removal is provided with a water drain tank below the EGR cooler.
レン配管の途中に酸性の水を中和する中和剤層を設けた
ディーゼル機関の排気ガス還流装置。4. The exhaust gas recirculation device for a diesel engine according to claim 3, wherein a neutralizing agent layer for neutralizing acidic water is provided in the drainage tank or the drain pipe.
気ガス還流回路を設け、排気ガス還流回路でススを除去
し、かつ、冷却して吸気側に還流させるディーゼル機関
において、熱交換器の冷却効率を維持するため排気ガス
還流回路上流側で排気ガスのススを除去し、その後に排
気ガスを冷却することを特徴とするディーゼル機関の排
気ガス還流方法。5. A heat exchanger in a diesel engine in which an exhaust gas recirculation circuit for recirculating a part of exhaust gas to the intake side is provided, soot is removed in the exhaust gas recirculation circuit, and cooled to recirculate to the intake side. In order to maintain the cooling efficiency of the exhaust gas recirculation circuit, exhaust gas soot is removed on the upstream side of the exhaust gas recirculation circuit, and then the exhaust gas is cooled.
気ガス還流回路を設け、排気ガス還流回路にススを除去
し、かつ、冷却して吸気側に還流させるディーゼル機関
において、吸気側に還流させる排気ガス中の酸性の水分
を低減してから還流させることを特徴とするディーゼル
機関の排気ガス還流方法。6. A diesel engine in which an exhaust gas recirculation circuit for recirculating a part of exhaust gas to the intake side is provided, soot is removed in the exhaust gas recirculation circuit, and cooling is performed to recirculate the exhaust gas to the intake side. An exhaust gas recirculation method for a diesel engine, characterized in that acidic water in the exhaust gas to be recirculated is reduced and then recirculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6052707A JPH07238870A (en) | 1994-02-25 | 1994-02-25 | Exhaust gas recirculation device of diesel engine and recirculation method of exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6052707A JPH07238870A (en) | 1994-02-25 | 1994-02-25 | Exhaust gas recirculation device of diesel engine and recirculation method of exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07238870A true JPH07238870A (en) | 1995-09-12 |
Family
ID=12922374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6052707A Pending JPH07238870A (en) | 1994-02-25 | 1994-02-25 | Exhaust gas recirculation device of diesel engine and recirculation method of exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07238870A (en) |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19633190A1 (en) * | 1996-08-17 | 1998-02-19 | Daimler Benz Ag | Cooling system for an internal combustion engine |
| EP0826868A1 (en) * | 1996-08-24 | 1998-03-04 | Volkswagen Aktiengesellschaft | Method to purify the exhaust gas of an internal combustion engine |
| DE19705631A1 (en) * | 1997-02-14 | 1998-08-20 | Audi Ag | Auxiliary cooling device for internal combustion engine |
| DE19736500A1 (en) * | 1997-08-22 | 1998-12-24 | Daimler Benz Ag | Arrangement for ancillary equipment of twin turbo-charged V-eight IC engine |
| DE19735306A1 (en) * | 1997-08-14 | 1999-02-18 | Audi Ag | Diesel motor |
| EP1405995A1 (en) * | 2002-10-02 | 2004-04-07 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Motor system with turbocharger and exhaust gas recirculation as well as method for the operation thereof |
| US6883321B2 (en) * | 2003-04-25 | 2005-04-26 | Bendix Commercial Vehicle Systems Llc | Filter assembly for exhaust gases |
| EP0924416B1 (en) * | 1997-12-15 | 2006-02-22 | Nissan Motor Company, Limited | Diesel engine |
| DE10003329B4 (en) * | 1999-01-27 | 2006-04-27 | Usui Kokusai Sangyo Kaisha Ltd., Nagasawa | Method for brazing an EGR cooler |
| WO2012045673A1 (en) * | 2010-10-05 | 2012-04-12 | Mahle International Gmbh | Exhaust-gas recirculation filter, internal combustion engine |
| JP2012189022A (en) * | 2011-03-11 | 2012-10-04 | Hino Motors Ltd | Heat exchanger cooling device by condensed water stored in condensed water storing device |
| JP2013072377A (en) * | 2011-09-28 | 2013-04-22 | Yanmar Co Ltd | Internal combustion engine with supercharger |
| JP2015045294A (en) * | 2013-08-29 | 2015-03-12 | マツダ株式会社 | Intake/exhaust device of vehicular engine |
| WO2015055547A1 (en) * | 2013-10-14 | 2015-04-23 | Continental Automotive Gmbh | Air suction system of an internal combustion engine, and method for detecting a cooling liquid leak |
| US9551303B2 (en) | 2014-09-18 | 2017-01-24 | Caterpillar Inc. | Exhaust gas recirculation system for an internal combustion engine and method for operating same |
| US10082114B2 (en) | 2016-02-12 | 2018-09-25 | Progress Rail Locomotive Inc. | Exhaust gas recirculation system |
| EP3533990A1 (en) * | 2018-02-28 | 2019-09-04 | Mann + Hummel Gmbh | Vertically mountable condensate separator |
| CN110486199A (en) * | 2019-09-17 | 2019-11-22 | 广东工业大学 | A kind of gas recirculation system of engine |
| CN112302838A (en) * | 2019-08-02 | 2021-02-02 | 广州汽车集团股份有限公司 | EGR exhaust gas recirculation system and automobile |
-
1994
- 1994-02-25 JP JP6052707A patent/JPH07238870A/en active Pending
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19633190B4 (en) * | 1996-08-17 | 2004-02-26 | Daimlerchrysler Ag | Cooling system for an internal combustion engine |
| FR2752440A1 (en) * | 1996-08-17 | 1998-02-20 | Daimler Benz Ag | COOLING SYSTEM FOR AN INTERNAL COMBUSTION ENGINE |
| DE19633190A1 (en) * | 1996-08-17 | 1998-02-19 | Daimler Benz Ag | Cooling system for an internal combustion engine |
| EP0826868A1 (en) * | 1996-08-24 | 1998-03-04 | Volkswagen Aktiengesellschaft | Method to purify the exhaust gas of an internal combustion engine |
| DE19705631A1 (en) * | 1997-02-14 | 1998-08-20 | Audi Ag | Auxiliary cooling device for internal combustion engine |
| DE19705631B4 (en) * | 1997-02-14 | 2010-07-22 | Audi Ag | Additional cooling device for internal combustion engines |
| DE19735306B4 (en) * | 1997-08-14 | 2010-11-11 | Audi Ag | Internal combustion engine |
| DE19735306A1 (en) * | 1997-08-14 | 1999-02-18 | Audi Ag | Diesel motor |
| DE19736500A1 (en) * | 1997-08-22 | 1998-12-24 | Daimler Benz Ag | Arrangement for ancillary equipment of twin turbo-charged V-eight IC engine |
| EP0924416B1 (en) * | 1997-12-15 | 2006-02-22 | Nissan Motor Company, Limited | Diesel engine |
| DE10003329B4 (en) * | 1999-01-27 | 2006-04-27 | Usui Kokusai Sangyo Kaisha Ltd., Nagasawa | Method for brazing an EGR cooler |
| EP1405995A1 (en) * | 2002-10-02 | 2004-04-07 | Ford Global Technologies, Inc., A subsidiary of Ford Motor Company | Motor system with turbocharger and exhaust gas recirculation as well as method for the operation thereof |
| US6883321B2 (en) * | 2003-04-25 | 2005-04-26 | Bendix Commercial Vehicle Systems Llc | Filter assembly for exhaust gases |
| WO2012045673A1 (en) * | 2010-10-05 | 2012-04-12 | Mahle International Gmbh | Exhaust-gas recirculation filter, internal combustion engine |
| JP2012189022A (en) * | 2011-03-11 | 2012-10-04 | Hino Motors Ltd | Heat exchanger cooling device by condensed water stored in condensed water storing device |
| JP2013072377A (en) * | 2011-09-28 | 2013-04-22 | Yanmar Co Ltd | Internal combustion engine with supercharger |
| JP2015045294A (en) * | 2013-08-29 | 2015-03-12 | マツダ株式会社 | Intake/exhaust device of vehicular engine |
| WO2015055547A1 (en) * | 2013-10-14 | 2015-04-23 | Continental Automotive Gmbh | Air suction system of an internal combustion engine, and method for detecting a cooling liquid leak |
| US10094341B2 (en) | 2013-10-14 | 2018-10-09 | Continental Automotive Gmbh | Air intake system of an internal combustion engine |
| US9551303B2 (en) | 2014-09-18 | 2017-01-24 | Caterpillar Inc. | Exhaust gas recirculation system for an internal combustion engine and method for operating same |
| US10082114B2 (en) | 2016-02-12 | 2018-09-25 | Progress Rail Locomotive Inc. | Exhaust gas recirculation system |
| EP3533990A1 (en) * | 2018-02-28 | 2019-09-04 | Mann + Hummel Gmbh | Vertically mountable condensate separator |
| CN112302838A (en) * | 2019-08-02 | 2021-02-02 | 广州汽车集团股份有限公司 | EGR exhaust gas recirculation system and automobile |
| CN112302838B (en) * | 2019-08-02 | 2022-04-01 | 广州汽车集团股份有限公司 | EGR exhaust gas recirculation system and automobile |
| CN110486199A (en) * | 2019-09-17 | 2019-11-22 | 广东工业大学 | A kind of gas recirculation system of engine |
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