JPH0240067A - Exhaust gas recirculation system for diesel engine - Google Patents
Exhaust gas recirculation system for diesel engineInfo
- Publication number
- JPH0240067A JPH0240067A JP63190905A JP19090588A JPH0240067A JP H0240067 A JPH0240067 A JP H0240067A JP 63190905 A JP63190905 A JP 63190905A JP 19090588 A JP19090588 A JP 19090588A JP H0240067 A JPH0240067 A JP H0240067A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- negative pressure
- auxiliary valve
- exhaust gas
- constant
- 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
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000010992 reflux Methods 0.000 abstract description 8
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はディーゼルエンジンの排気対策手段の一つであ
る排気再循環装置、詳しくは排気還流の簡単にして適正
な制御手段をもった排気再循環装置に関するものである
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an exhaust gas recirculation device, which is one of the exhaust countermeasures for diesel engines. This relates to a circulation device.
（従来の技術）
エンジンの排気対策の一つとして、排気の一部を吸気に
還流させることにより燃焼温度を低下させＮＯ，ｘの生
成を減少させることを計った排気再循環装置は周知であ
って、王にガソリンエンジンに利用されてお９デイーゼ
ルエンシフについては顕著な効果がないものとされ一部
で利用されているにすぎない。(Prior Art) As one of engine exhaust countermeasures, an exhaust gas recirculation device is well known, which reduces the combustion temperature and reduces the generation of NO and x by recirculating a part of the exhaust gas into the intake air. However, 9 diesel engine shifters are generally used in gasoline engines, but they are considered to have no significant effect and are only used in some areas.
（発明が解決しようとする課題） 即ち、排気の一部を吸気に還流させる場合。(Problem to be solved by the invention) That is, when part of the exhaust gas is recirculated to the intake air.
絞り弁上流へ還流させマニホルド負圧の変動の影響を直
接受けないようにしても、絞り弁による吸入空気量制御
によってエンジンの出力を制御するガソリンエンジンに
おいては絞シ弁上流でもかなりの負圧があるとともに吸
入空気量と負圧とエンジン出力とに相関々係があるため
比較的簡単なシステムで還流量を制御することが可能で
ある。Even if the flow is recirculated upstream of the throttle valve so that it is not directly affected by fluctuations in manifold negative pressure, in gasoline engines that control the engine output by controlling the amount of intake air with the throttle valve, there is considerable negative pressure even upstream of the throttle valve. In addition, since there is a correlation between the intake air amount, negative pressure, and engine output, it is possible to control the recirculation amount with a relatively simple system.
しかしながら、ディーゼルエンジンは吸入空気量を一定
とし燃料噴射量制御によってエンジンの出力を制御して
いるので吸入空気量と負圧とエンジン出力との間に相関
々係がないこと。However, in a diesel engine, the intake air amount is kept constant and the engine output is controlled by fuel injection amount control, so there is no correlation between the intake air amount, negative pressure, and engine output.
およびガソリンエンジンと比較してマニホルド負圧が低
く低速運転域では殆んど負圧がないことによって還流量
を適正に制御することができず、これが顕著な効果を得
ることができない原因と考えられる。Also, the manifold negative pressure is lower than that of a gasoline engine, and there is almost no negative pressure in the low-speed operating range, making it impossible to properly control the recirculation amount, which is thought to be the reason for not being able to obtain significant effects. .
本発明はこのような課題を解決し、簡単な構成で還流量
を適正に制御できるディーゼルエンジンの排気再循環装
置を提供することを目的として発明されたものである。The present invention was invented with the object of solving these problems and providing an exhaust gas recirculation device for a diesel engine that can appropriately control the recirculation amount with a simple configuration.
（課題を解決するための手段）
本発明による前記課題を解決するための手段は、絞り弁
の上流に吸気管路を開閉する補助弁が設けられていると
ともに、前記補助弁と絞り弁との間の負圧に応じて作動
し前記負圧を一定とするように駆動するアクチュエータ
が前記補助弁に連結されており、還流量制御用の調整弁
を有する排気の還流通路がＡｉｌ記一定負圧部分におい
て吸気管路に接続され、且つ前記調整弁を駆動するアク
チーエータを作動させる負圧の導入路が前記補助弁の閉
弁位置よりも上流で所定開度以上のとき下流となる位置
において前記吸気管路に接続されている構成とされてい
る。(Means for Solving the Problems) The means for solving the problems according to the present invention is that an auxiliary valve for opening and closing the intake pipe is provided upstream of the throttle valve, and a connection between the auxiliary valve and the throttle valve is provided. An actuator is connected to the auxiliary valve, and the exhaust gas recirculation passage having a regulating valve for controlling the recirculation amount is connected to the auxiliary valve. The intake pipe is connected to the intake pipe at a position where the introduction passage for negative pressure that operates the actuator that drives the regulating valve is upstream of the closing position of the auxiliary valve and becomes downstream when the opening is at least a predetermined opening degree. It is configured to be connected to a conduit.
（作 用）
補助弁下流の負圧によってアクチーエータが補助弁を開
閉駆動し、開度増大により負圧が低下すると開度を減少
させ開度減少により負圧が上昇すると開度を上昇させて
絞夛弁との間の部分を一定負圧とする。 排気は調整弁
で還流量を制御されて一定負圧部分へ還流され、調整弁
は補助弁の位置に応じて駆動され還流量を制御する。(Function) The actuator opens and closes the auxiliary valve using the negative pressure downstream of the auxiliary valve. When the negative pressure decreases due to an increase in the opening, the opening decreases. When the negative pressure increases due to the decrease in the opening, the actuator increases the opening and throttles the valve. A constant negative pressure is maintained between the valve and the valve. The recirculation amount of the exhaust gas is controlled by a regulating valve and is recirculated to the constant negative pressure section, and the regulating valve is driven according to the position of the auxiliary valve to control the recirculation amount.
（実 施 例） 本発明の実施例を図面を参照して説明する。(Example) Embodiments of the present invention will be described with reference to the drawings.
エアクリーナ１からエンジン２に至る吸気管路３にアク
セルペダルガによって操作される絞り弁４の上流側へ位
置させて補助弁５が設置されている。 この補助弁５
は吸気管路３の中心を横断した弁軸６に取付けられ、弁
軸６に固着したアーム７がアクチュエータ８のダイヤフ
ラム９に突設したロッドｌＯと結合されている。An auxiliary valve 5 is installed in an intake pipe 3 leading from an air cleaner 1 to an engine 2, upstream of a throttle valve 4 operated by an accelerator pedal. This auxiliary valve 5
is attached to a valve shaft 6 that crosses the center of the intake pipe 3, and an arm 7 fixed to the valve shaft 6 is connected to a rod 10 protruding from a diaphragm 9 of an actuator 8.
アクチュエータ８は前記ダイヤフラム９によって仕切ら
れた大気室１１と負圧室１２．負圧室ｎに装入したばね
１３を具えており、吸気管路３の補助弁５と絞り弁４と
の間の部分が負圧室１２に負圧路１４によって接続され
ている。The actuator 8 has an atmospheric chamber 11 and a negative pressure chamber 12 separated by the diaphragm 9. It includes a spring 13 inserted into a negative pressure chamber n, and a portion of the intake pipe 3 between the auxiliary valve 5 and the throttle valve 4 is connected to the negative pressure chamber 12 by a negative pressure path 14.
エンジン２が運転を開始し吸気管路３を空気が流れるよ
うになると補助弁５の下流に負圧が発生し、この負圧が
負圧家臣に導入されてばね１３の荷重と平衡した位置に
ダイヤフラム９を移動させ補助弁５を開く。 補助弁５
の開度が大きくなって負圧が低下すると開度を小さくシ
。When the engine 2 starts operating and air begins to flow through the intake pipe 3, negative pressure is generated downstream of the auxiliary valve 5, and this negative pressure is introduced into the negative pressure retainer to a position balanced with the load of the spring 13. The auxiliary valve 5 is opened by moving the diaphragm 9. Auxiliary valve 5
If the opening becomes large and the negative pressure decreases, reduce the opening.
開度が小さくなって負圧が高くなると開度を大きくシ、
絞り弁４の開度に関係なく補助弁５と絞り弁４との間の
部分の負圧をエンジン２の全回転域で一定とするのであ
る。If the opening becomes smaller and the negative pressure increases, the opening will be increased.
Regardless of the opening degree of the throttle valve 4, the negative pressure in the area between the auxiliary valve 5 and the throttle valve 4 is kept constant over the entire rotation range of the engine 2.
排気の還流通路１５は還流量制御用の調整弁１６を有し
ており、排気管路１７と吸気管路３の補助弁５と絞り弁
４との間の一定負圧部分１８とを接続しており、調支弁
１６はアクチュエータ１９のダイヤフラム加と弁棒２１
によって結合されている。The exhaust gas recirculation passage 15 has a regulating valve 16 for controlling the amount of recirculation, and connects the exhaust pipe 17 with a constant negative pressure section 18 between the auxiliary valve 5 and the throttle valve 4 of the intake pipe 3. The control valve 16 is connected to the diaphragm of the actuator 19 and the valve stem 21.
are connected by.
アクチュエータ１９は前記ダイヤフラム加によって弁室
ｎと仕切られた負圧室ｎおよび負圧室るに装入したばね
冴を具えており、補助弁５の閉弁位置よりも上流であっ
て所定開度以上のとき下流となる位置において吸気管路
３ヘボ一ト部をもって開口した導入路５が負圧室乙に接
続されている。The actuator 19 includes a negative pressure chamber n separated from the valve chamber n by the diaphragm, and a spring inserted into the negative pressure chamber n, and is located upstream of the closing position of the auxiliary valve 5 and has a predetermined opening degree. In this case, the introduction path 5 opened at the bottom of the intake pipe 3 at a downstream position is connected to the negative pressure chamber B.
エンジン２が運転を開始したとき、吸入空気量の増大に
伴って補助弁５が次第に開き、その下流の負圧とアクチ
ュエータ８のばね１３とが平衡した位置となるが、その
初期においてはホトかに負圧が作用しないため調整弁１
６は閉弁しており、それより負圧が次第に作用してアク
チーエータ１９の負圧室おに負圧が導入されて調整弁１
６を開弁し、ボートがか補助弁５の下流側となった後は
一定負圧によル調整弁１６を一定開度として一定吸入空
気量に一定量の排気を還流する。When the engine 2 starts operating, the auxiliary valve 5 gradually opens as the amount of intake air increases, reaching a position where the negative pressure downstream of it and the spring 13 of the actuator 8 are in equilibrium. Adjustment valve 1 because negative pressure does not act on
Valve 6 is closed, and negative pressure is gradually applied to the negative pressure chamber of the actuator 19 and the regulating valve 1 is closed.
6 is opened, and after the boat is on the downstream side of the auxiliary valve 5, the control valve 16 is kept at a constant opening due to a constant negative pressure, and a constant amount of exhaust gas is recirculated to a constant intake air amount.
（発明の効果）
本発明によると、補助弁がその下流の負圧に応じて自動
的に開閉動作して絞り弁との間を一定負圧とし、この一
定員圧を利用して排気を還流させるものであるから、絞
り弁開度やマニホルド負圧に関係なく発生させた一定負
圧で安定よく還流させることができるばかりか、エンジ
ン運転時に補助弁の位置によって調整弁を駆動するため
運転初期の還流量の制限および以後の還流量の一定維持
をきわめて簡単な構成で適正に行なうことができるもの
である。(Effects of the Invention) According to the present invention, the auxiliary valve automatically opens and closes depending on the negative pressure downstream of the auxiliary valve, maintains a constant negative pressure between the auxiliary valve and the throttle valve, and uses this constant pressure to recirculate exhaust gas. This not only allows stable reflux with a constant negative pressure generated regardless of the throttle valve opening or manifold negative pressure, but also allows for stable reflux at the constant negative pressure that is generated regardless of the throttle valve opening or manifold negative pressure. This makes it possible to appropriately limit the reflux amount and maintain the reflux amount constant thereafter with an extremely simple configuration.
図面は本発明の実施例を示す配置図である。
２・・・エンジン、 ３・・・吸気管路、 ４・・
・絞ｐ弁、 ５・・・補助弁、 ８・・・アクチュ
エータ。
９・・・ダイヤフラム、１２・・・負圧室、１３・・・
ばね。
１４・・・負圧路、１５・・・還流通路、１６・・・調
整弁。
１８・・・一定員圧部分、 １９・・・アクチエエー
タ。
加・・・ダイヤフラム、２３・・・負圧室、２４・・・
ばね。
５・・・導入路。The drawings are layout diagrams showing embodiments of the present invention. 2...Engine, 3...Intake pipe line, 4...
- Throttle p valve, 5... Auxiliary valve, 8... Actuator. 9...Diaphragm, 12...Negative pressure chamber, 13...
Spring. 14...Negative pressure path, 15...Recirculation path, 16...Adjustment valve. 18... Constant pressure part, 19... Actieator. Addition...Diaphragm, 23...Negative pressure chamber, 24...
Spring. 5...Introduction path.
Claims (1)
いるとともに、前記補助弁と絞り弁との間の負圧に応じ
て作動し前記負圧を一定とするように駆動するアクチュ
エータが前記補助弁に連結されており、還流量制御用の
調整弁を有する排気の還流通路が前記一定負圧部分にお
いて吸気通路に接続され、且つ前記調整弁を駆動するア
クチュエータを作動させる負圧の導入路が前記補助弁の
閉弁位置よりも上流で所定開度以上のとき下流となる位
置において前記吸気管路に接続されていることを特徴と
するディーゼルエンジンの排気再循環装置。An auxiliary valve for opening and closing the intake pipe is provided upstream of the throttle valve, and an actuator is operated in response to the negative pressure between the auxiliary valve and the throttle valve to keep the negative pressure constant. An exhaust gas recirculation passage connected to the auxiliary valve and having a regulating valve for controlling the amount of recirculation is connected to the intake passage at the constant negative pressure portion, and introducing negative pressure to operate an actuator that drives the regulating valve. An exhaust gas recirculation device for a diesel engine, characterized in that the auxiliary valve is connected to the intake pipe at a position upstream from the closed position of the auxiliary valve and downstream when the opening is equal to or greater than a predetermined opening degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63190905A JPH0240067A (en) | 1988-07-29 | 1988-07-29 | Exhaust gas recirculation system for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63190905A JPH0240067A (en) | 1988-07-29 | 1988-07-29 | Exhaust gas recirculation system for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0240067A true JPH0240067A (en) | 1990-02-08 |
Family
ID=16265669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63190905A Pending JPH0240067A (en) | 1988-07-29 | 1988-07-29 | Exhaust gas recirculation system for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0240067A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017223144A (en) * | 2016-06-14 | 2017-12-21 | トヨタ自動車株式会社 | Control device of natural aspiration gasoline engine |
-
1988
- 1988-07-29 JP JP63190905A patent/JPH0240067A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017223144A (en) * | 2016-06-14 | 2017-12-21 | トヨタ自動車株式会社 | Control device of natural aspiration gasoline engine |
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