JPH0615859B2 - Exhaust gas reduction device for engine - Google Patents
Exhaust gas reduction device for engineInfo
- Publication number
- JPH0615859B2 JPH0615859B2 JP61018119A JP1811986A JPH0615859B2 JP H0615859 B2 JPH0615859 B2 JP H0615859B2 JP 61018119 A JP61018119 A JP 61018119A JP 1811986 A JP1811986 A JP 1811986A JP H0615859 B2 JPH0615859 B2 JP H0615859B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- engine
- nozzle
- pressure air
- cylinder
- 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.)
- Expired - Lifetime
Links
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- Exhaust-Gas Circulating Devices (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は,エンジンの排気ガス還流装置の改良に関する
ものである。Description: TECHNICAL FIELD The present invention relates to an improvement of an exhaust gas recirculation device for an engine.
(従来技術) エンジンはその回転数及び負荷に応じてシリンダの吸気
工程で排気ガスをシリンダに吸入して排気ガスを還元す
ることによってNOxの如き排気ガスに含まれる有害成
分を除去しており,これは通常EGR(排気ガス還元)
機能と称されている。一般に,排気ガス還元装置は,エ
ンジンの排気パイプに接続された還元通路とこの還元通
路に電磁弁を介して接続されエンジンの吸気系統に排気
パイプからの排気ガスを供給するノズルとエンジンの回
転数及び負荷に応じて電磁弁を開く制御手段とから成っ
ている。従来のこの種の装置ではノズルはEGR機能専
用のノズルであったのでこのノズル内の開閉弁,特にそ
の弁座にカーボンが付着し易く,このため弁座が腐食し
てEGR機能を有効に発揮することができなくなる欠点
があった。このため、ノズルの清掃手段を付加すること
が考えられるが、これは装置を複雑にし、高価となるの
で好ましくない。また、従来技術では、排気ガス還元用
の排気ガスは吸気系統の途中に供給していたので、シリ
ンダ間でEGR濃度にばらつきが生ずる虞があった。(Prior Art) The engine removes harmful components such as NOx contained in the exhaust gas by sucking the exhaust gas into the cylinder and reducing the exhaust gas in the intake process of the cylinder according to the rotational speed and the load, This is usually EGR (exhaust gas reduction)
It is called a function. In general, an exhaust gas reduction device includes a reduction passage connected to an engine exhaust pipe, a nozzle connected to the reduction passage via a solenoid valve to supply exhaust gas from the exhaust pipe to an engine intake system, and an engine speed. And a control means for opening the solenoid valve according to the load. In this type of conventional device, the nozzle was a nozzle dedicated to the EGR function, so carbon is likely to adhere to the on-off valve in this nozzle, especially to its valve seat, which causes the valve seat to corrode and effectively exert the EGR function. There was a drawback that I could not do it. Therefore, it is conceivable to add cleaning means for the nozzle, but this is not preferable because it complicates the apparatus and makes it expensive. Further, in the related art, since the exhaust gas for reducing the exhaust gas is supplied in the middle of the intake system, there is a possibility that the EGR concentration varies among the cylinders.
(発明の目的) 本発明の目的は,排気ガス還元時にノズル内に付着する
傾向があるカーボンを特別な手段を付加することなく有
効に取除くことができる上に排気ガス還元濃度のばらつ
きを生ずることがなく、従ってEGR機能を長期に亘っ
て維持することができるエンジンの排気ガス還元装置を
提供することにある。(Object of the Invention) An object of the present invention is to effectively remove carbon that tends to adhere to the nozzle during exhaust gas reduction without adding special means, and also to cause variations in exhaust gas reduction concentration. Therefore, it is an object of the present invention to provide an exhaust gas reduction device for an engine that can maintain the EGR function for a long period of time.
(発明の構成) 本発明のエンジンの排気ガス還元装置は,エンジンの排
気パイプに接続された還元通路とこの還元通路に電磁弁
を介して接続されエンジンの吸気系統に排気パイプから
の排気ガスを供給するノズルとエンジンの回転数及び負
荷に応じて電磁弁を開く制御手段とから成っているが,
この排気ガス還元用のノズルは発進及び加速時に高圧空
気供給源から高圧空気を直接エンジンのシリンダに吹込
む空気噴射ノズルを兼用し、電磁弁はこの空気噴射ノズ
ルを還元通路と高圧空気の供給源とに切換える三方弁で
あり,また制御手段は排気ガスをシリンダに吹込む排気
ガス還元時と高圧空気をシリンダに吹込む発進及び加速
時とに応じて三方弁を切換えるように制御することを特
徴としている。(Structure of the Invention) An exhaust gas reducing apparatus for an engine according to the present invention includes a reducing passage connected to an exhaust pipe of an engine, and an exhaust gas from the exhaust pipe connected to the reducing passage via a solenoid valve to an intake system of the engine. It consists of a nozzle to supply and control means to open the solenoid valve according to the engine speed and load.
This exhaust gas reduction nozzle also serves as an air injection nozzle that blows high-pressure air directly from the high-pressure air supply source into the cylinder of the engine when starting and accelerating, and the solenoid valve uses this air-injection nozzle as a reduction passage and a high-pressure air supply source. It is a three-way valve for switching to and, and the control means controls to switch the three-way valve in response to exhaust gas reduction when blowing exhaust gas into the cylinder and start and acceleration when blowing high-pressure air into the cylinder. I am trying.
このように構成すると,空気噴射ノズルは制御手段によ
って車両の発進時及び加速時には高圧空気を噴射するこ
とができるが,この空気噴射ノズルは、排気ガス還元用
のノズルを兼ねているので、EGRモードでは排気パイ
プから導かれる排気ガスをシリンダに噴射して排気ガス
還元を行なうことができる。従ってEGRモードで空気
噴射ノズルに堆積する傾向があるカーボンは高圧空気の
噴射時に清掃されてノズルの耐久性を向上することがで
きるからEGR機能を低下することがなくなることが解
る。また、このようにノズルが排気ガス還元用と発進加
速用とを兼ねている上に排気ガス還元用ノズルの清掃手
段を特に必要としないので、排気ガス還元装置と発進加
速のための空気供給系統とを別個に設ける場合に比べ
て、装置が著しく簡略化されるため、極めて経済的であ
る。According to this structure, the air injection nozzle can inject high-pressure air at the time of starting and accelerating the vehicle by the control means, but since this air injection nozzle also serves as a nozzle for exhaust gas reduction, the EGR mode The exhaust gas introduced from the exhaust pipe can be injected into the cylinder to reduce the exhaust gas. Therefore, it is understood that the carbon that tends to be deposited on the air injection nozzle in the EGR mode can be cleaned when the high pressure air is injected and the durability of the nozzle can be improved, so that the EGR function is not deteriorated. Further, since the nozzle serves both for exhaust gas reduction and for starting acceleration in this way, and no cleaning means for the exhaust gas reducing nozzle is particularly required, an exhaust gas reducing device and an air supply system for starting acceleration are also required. This is extremely economical as compared to the case where the and are separately provided, because the device is significantly simplified.
更に、排気ガス還元(EGR)時に、排気ガスは吸気系
統の途中ではなく、エンジンのシリンダに直接吹込むの
で、シリンダ間でEGR濃度にばらつきを生ずることが
なく、良好なEGR機能を達成することができる。Furthermore, during exhaust gas reduction (EGR), the exhaust gas is blown directly into the cylinders of the engine, not in the middle of the intake system, so there is no variation in EGR concentration between cylinders, and a good EGR function is achieved. You can
(実施例) 本発明の実施例を図面を参照して詳細に説明すると,第
1図及び第2図は本発明に係るエンジンの排気ガス還元
装置10を示し,この排気ガス還元装置10はエンジン
12の排気パイプ14に接続された還元通路16とこの
還元通路16に電磁弁18を介して接続されエンジン1
2の吸気時にエンジン12のシリンダ20に排気パイプ
14からの排気ガスを吹込むノズル22とエンジン12
の回転数及び負荷に応じて電磁弁18を開く制御手段2
4とから成っている。(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 and FIG. 2 show an exhaust gas reduction apparatus 10 for an engine according to the present invention. The return passage 16 connected to the exhaust pipe 14 of the engine 12 and the return passage 16 via the solenoid valve 18
The nozzle 22 that blows the exhaust gas from the exhaust pipe 14 into the cylinder 20 of the engine 12 and the engine 12
Control means 2 for opening the solenoid valve 18 according to the rotation speed and load of the
It consists of 4 and.
本発明の排気ガス還元装置10ではこの排気ガス還元用
のノズル22は発進及び加速時に高圧空気供給源26か
ら高圧空気をシリンダ20に直接吹込む空気噴射ノズル
22Aを兼用している。また、電磁弁18はこの空気噴
射ノズル22Aを還元通路16と高圧空気供給源26と
に切換える三方弁18Aから成っている。高圧空気供給
源26はコンプレッサ28によって高圧空気が貯えられ
る空気タンク30から成っている。制御手段24は排気
ガスをシリンダ20に吹込む排気ガス還元時と高圧空気
をシリンダに吹込む発進及び加速時とに応じて三方弁1
8Aを切換えるように制御する。この制御手段24は,
例えば,エンジン回転数N,車速V,アクセル開度O,
トランスミッション位置T/Mのフアクタ信号を受けて
排気ガス還元モードEGR及び発進加速モードACを判
断するコンピュータ32から成っている。尚、図示の実
施例では,排気パイプ14は還元通路16の下流側にこ
の排気パイプ14を閉じるバタフライ弁34を有し,こ
のバタフライ弁34はコンピュータ32が排気ガス還元
モードEGRの判断をしたときに閉じるようにエアシリ
ンダ36によって駆動される。エアシリンダ36は空気
タンク30から供給される高圧空気によって起動される
ようにチエックバルブ38によって制御される。In the exhaust gas reduction device 10 of the present invention, the exhaust gas reduction nozzle 22 also serves as an air injection nozzle 22A for directly injecting high pressure air from the high pressure air supply source 26 into the cylinder 20 at the time of starting and accelerating. The solenoid valve 18 is composed of a three-way valve 18A that switches the air injection nozzle 22A to the return passage 16 and the high pressure air supply source 26. The high pressure air supply source 26 comprises an air tank 30 in which high pressure air is stored by a compressor 28. The control means 24 responds to the exhaust gas returning to the cylinder 20 and the high-pressure air to the cylinder for starting and accelerating.
Control to switch 8A. This control means 24 is
For example, engine speed N, vehicle speed V, accelerator opening O,
It comprises a computer 32 which receives the factor signal of the transmission position T / M and judges the exhaust gas reduction mode EGR and the start acceleration mode AC. In the illustrated embodiment, the exhaust pipe 14 has a butterfly valve 34 that closes the exhaust pipe 14 on the downstream side of the return passage 16. The butterfly valve 34 is used when the computer 32 determines the exhaust gas reduction mode EGR. It is driven by the air cylinder 36 so as to close. The air cylinder 36 is controlled by a check valve 38 so as to be activated by the high pressure air supplied from the air tank 30.
空気噴射ノズル22Aは,第3図に示すように,ソレノ
イド40によって開閉されるポペット弁42を有し,ソ
レノイド40はモードEGRまたはACのいずれかの判
断がされたとき励磁されてポペット弁42を開くように
制御する。As shown in FIG. 3, the air injection nozzle 22A has a poppet valve 42 which is opened and closed by a solenoid 40, and the solenoid 40 is excited when the mode EGR or AC is judged and the poppet valve 42 is opened. Control to open.
次に,本発明の装置の動作をのべると,コンピュータ3
2が発進加速モードACを判断すると,三方弁18Aを
空気タンク30速に切換え,シリンダ20が吸気工程に
入ったときに図示ない吸気バルブを閉じて空気噴射ノズ
ル22Aのソレノイド40が励磁されてポペット弁42
を開く。従って,高圧空気が空気タンク30から三方弁
18Aを通ってシリンダ20内に高圧空気が吸入されて
ηυを向上し,燃料噴射量とあいまって発進及び低速加
速時のトルクを増大する。また,コンピュータ32が排
気ガス還元モードEGRを判断したときには三方弁18
Aを還元通路16側に切換えて吸気工程で空気噴射ノズ
ル22Aのソレノイド40を励磁してポペット弁42を
開く。従って,排気ガスが排気パイプ14から還元通路
16,三方弁18Aを通ってシリンダ20内に排気ガス
が吸入されて排気ガスを還元する。尚,このときバタフ
ライ弁34が閉じるので排気ガスは還元通路16の入口
で高圧となって排気ガスの還元量が増大する。この排気
ガス還元モードEGRではポペット弁42の弁座にカー
ボンが堆積する傾向があるが,このカーボンは発進加速
モードACで高圧空気が空気噴射ノズル22Aから噴射
されるときに清掃される。Next, the operation of the apparatus of the present invention will be described.
When 2 determines the start acceleration mode AC, the three-way valve 18A is switched to the air tank 30th speed, and when the cylinder 20 enters the intake stroke, the intake valve (not shown) is closed and the solenoid 40 of the air injection nozzle 22A is excited to activate the poppet. Valve 42
open. Therefore, the high-pressure air is sucked into the cylinder 20 from the air tank 30 through the three-way valve 18A to improve ηυ, and together with the fuel injection amount, the torque at the time of start and low-speed acceleration is increased. When the computer 32 determines the exhaust gas reduction mode EGR, the three-way valve 18
By switching A to the return passage 16 side, the solenoid 40 of the air injection nozzle 22A is excited in the intake stroke to open the poppet valve 42. Therefore, the exhaust gas is sucked into the cylinder 20 from the exhaust pipe 14 through the reduction passage 16 and the three-way valve 18A to reduce the exhaust gas. At this time, since the butterfly valve 34 is closed, the exhaust gas has a high pressure at the inlet of the reducing passage 16 and the amount of reduction of the exhaust gas increases. In this exhaust gas reduction mode EGR, carbon tends to deposit on the valve seat of the poppet valve 42, but this carbon is cleaned when high pressure air is injected from the air injection nozzle 22A in the start acceleration mode AC.
(発明の効果) 本発明によれば,上記のように,空気噴射ノズルは制御
手段によって車両の発進時及び加速時には高圧空気を噴
射することができるが,この空気噴射ノズルは、排気ガ
ス還元用のノズルを兼ねているので、EGRモードでは
排気パイプから導かれる排気ガスをシリンダに噴射して
排気ガス還元を行なうことができる。従ってEGRモー
ドで空気噴射ノズルに堆積する傾向があるカーボンは高
圧空気の噴射時に清掃されてノズルの耐久性を向上する
ことができるからEGR機能を低下することがなくなる
実益がある。更に、このようにノズルが排気ガス還元用
と発進加速用とを兼ねて両系統を部分的に共用し、また
排気ガス還元用ノズルの清掃手段を特に必要としないの
で、全体的に装置が著しく簡略化され、極めて経済的で
ある。(Effects of the Invention) According to the present invention, as described above, the air injection nozzle can inject high-pressure air at the time of starting and accelerating the vehicle by the control means. In the EGR mode, the exhaust gas introduced from the exhaust pipe can be injected into the cylinder to reduce the exhaust gas. Therefore, carbon that tends to be deposited on the air injection nozzle in the EGR mode can be cleaned when the high pressure air is injected and the durability of the nozzle can be improved, so that the EGR function is not deteriorated. In addition, since the nozzle partially shares both systems for both exhaust gas reduction and start acceleration in this way, and no special cleaning means for the exhaust gas reduction nozzle is required, the overall system is significantly improved. Simplified and extremely economical.
また、排気ガス還元(EGR)時に、排気ガスは吸気系
統の途中ではなく、エンジンのシリンダに直接吹込むの
で、シリンダ間でEGR濃度にばらつきを生ずることが
なく、良好なEGR機能を達成することができる。Further, during exhaust gas reduction (EGR), the exhaust gas blows directly into the cylinders of the engine, not in the middle of the intake system, so there is no variation in EGR concentration between cylinders, and a good EGR function is achieved. You can
第1図及び第2図は本発明に係るエンジンの排気ガス還
元装置の正面図及び側面概略系統図,第3図は空気噴射
ノズルの拡大断面図である。 10……エンジンの排気ガス還元装置,12……エンジ
ン,14……排気パイプ,16……還元通路,18……
電磁弁,18A……三方弁,20……シリンダ,22…
…ノズル,22A……空気噴射ノズル,24……制御手
段,26……高圧空気供給源。1 and 2 are a front view and a schematic side view of an exhaust gas reduction device for an engine according to the present invention, and FIG. 3 is an enlarged sectional view of an air injection nozzle. 10 ... Engine exhaust gas reduction device, 12 ... Engine, 14 ... Exhaust pipe, 16 ... Reduction passage, 18 ...
Solenoid valve, 18A ... 3-way valve, 20 ... Cylinder, 22 ...
... Nozzle, 22A ... air injection nozzle, 24 ... control means, 26 ... high-pressure air supply source.
Claims (1)
路と前記還元通路に電磁弁を介して接続されエンジンの
吸気系統に前記排気パイプからの排気ガスを供給するノ
ズルと前記エンジンの回転数及び負荷に応じて前記電磁
弁を開く制御手段とから成るエンジンの排気ガス還元装
置において、前記ノズルは発進及び加速時に高圧空気供
給源から高圧空気を前記エンジンのシリンダに直接吹込
む空気噴射ノズルを兼用し、前記電磁弁は前記空気噴射
ノズルを前記還元通路と前記高圧空気供給源とに切換え
る三方弁であり、また前記制御手段は前記排気ガスを前
記シリンダに吹込む排気ガス還元時と前記高圧空気を前
記シリンダに吹込む発進及び加速時とに応じて前記三方
弁を切換えるように制御することを特徴とするエンジン
の排気ガス還元装置。1. A reduction passage connected to an exhaust pipe of an engine, a nozzle connected to the reduction passage via a solenoid valve for supplying exhaust gas from the exhaust pipe to an intake system of the engine, and a rotation speed of the engine. In an exhaust gas reduction device for an engine, which comprises a control means for opening the solenoid valve according to a load, the nozzle also serves as an air injection nozzle for directly injecting high pressure air from a high pressure air supply source into a cylinder of the engine at the time of starting and accelerating. The solenoid valve is a three-way valve that switches the air injection nozzle between the reducing passage and the high-pressure air supply source, and the control means controls the exhaust gas when the exhaust gas is blown into the cylinder and the high-pressure air. Exhaust gas reducing apparatus for an engine, characterized in that the three-way valve is controlled so as to be switched depending on when the vehicle is started and accelerated. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61018119A JPH0615859B2 (en) | 1986-01-31 | 1986-01-31 | Exhaust gas reduction device for engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61018119A JPH0615859B2 (en) | 1986-01-31 | 1986-01-31 | Exhaust gas reduction device for engine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62178765A JPS62178765A (en) | 1987-08-05 |
JPH0615859B2 true JPH0615859B2 (en) | 1994-03-02 |
Family
ID=11962716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61018119A Expired - Lifetime JPH0615859B2 (en) | 1986-01-31 | 1986-01-31 | Exhaust gas reduction device for engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0615859B2 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5523381A (en) * | 1978-08-09 | 1980-02-19 | Nippon Denso Co Ltd | Exhaust gas recirculation equipment |
JPS614006Y2 (en) * | 1979-06-08 | 1986-02-07 | ||
JPS5987228A (en) * | 1982-11-10 | 1984-05-19 | Daihatsu Motor Co Ltd | Supercharging device for internal-combustion engine |
JPS60224961A (en) * | 1984-04-23 | 1985-11-09 | Toyota Motor Corp | Egr controller for diesel engine |
JPS616631U (en) * | 1984-06-20 | 1986-01-16 | マツダ株式会社 | Diesel engine exhaust recirculation control device |
-
1986
- 1986-01-31 JP JP61018119A patent/JPH0615859B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS62178765A (en) | 1987-08-05 |
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