JPH0396652A - Exhaust gas reflux controller of diesel engine - Google Patents
Exhaust gas reflux controller of diesel engineInfo
- Publication number
- JPH0396652A JPH0396652A JP1232978A JP23297889A JPH0396652A JP H0396652 A JPH0396652 A JP H0396652A JP 1232978 A JP1232978 A JP 1232978A JP 23297889 A JP23297889 A JP 23297889A JP H0396652 A JPH0396652 A JP H0396652A
- Authority
- JP
- Japan
- Prior art keywords
- control valve
- intake
- opening
- control
- engine
- 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
- 238000010992 reflux Methods 0.000 title abstract 2
- 238000001514 detection method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- Output Control And Ontrol Of Special Type Engine (AREA)
- 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ガス還流（ＥＣ；Ｒ
）制御装置に関する．
（従来技術｝
ディーゼルエンジンのＮＯ８低減システムとしてＥＧＲ
システムがある。このＥＧＲシステムは、一般にエンジ
ンの排気通路と吸気通路とを連通ずる排気ガス還流通路
（ＥＧＲ通路〉に排気ガス還流量制御弁（ＥＧＲ弁）を
設け、このＥＧＲ弁のリフト量をエンジンの運転状態に
応じて制御することによりＥＧＲＩを変え、これにより
Ｎｏ．の低減を図るものである（外部ＥＧＲ方式）。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to exhaust gas recirculation (EC; R
) Regarding control devices. (Conventional technology) EGR as a NO8 reduction system for diesel engines
There is a system. This EGR system generally includes an exhaust gas recirculation flow control valve (EGR valve) in the exhaust gas recirculation passage (EGR passage) that communicates the exhaust passage and intake passage of the engine, and adjusts the lift amount of the EGR valve based on the engine operating condition. This method changes the EGRI by controlling it in accordance with the number, thereby reducing the number (external EGR method).
また、ディーゼルエンジンの場合には、吸気負圧を利用
して排気ガスを吸気系に吸いこませることができないた
め、例えば特開昭６１−７９８２８号公報に開示されて
いるように、吸気通路におけるＥＧＲ通路の開口部上流
側に吸気絞り弁を設け、ＥＧＲ時にこの吸気絞り弁を閉
作動させて吸気負圧を発生させることにより、排気ガス
を効果的に還流させることも行なわれている．
一方、燃焼後の排気ガスの一部を燃焼室内に残留させる
内部ＥＧＲ方式がある．この方式は、排気行程終期から
吸気行程初期にかけての吸排気弁の開弁期間のオーバー
ランプにもとづき、一旦排気通路へ出た排気ガスを吸気
負圧によって燃焼室もしくは吸気通路へと引戻して残留
ガスとするものである。Furthermore, in the case of a diesel engine, exhaust gas cannot be sucked into the intake system using intake negative pressure. An intake throttle valve is provided upstream of the opening of the passage, and the exhaust gas is effectively recirculated by closing the intake throttle valve during EGR to generate intake negative pressure. On the other hand, there is an internal EGR method in which part of the exhaust gas remains in the combustion chamber after combustion. This method is based on an over-ramp of the opening period of the intake and exhaust valves from the end of the exhaust stroke to the beginning of the intake stroke, and exhaust gas that has once exited to the exhaust passage is pulled back into the combustion chamber or intake passage by intake negative pressure, resulting in residual gas. That is.
ところで、上記内部ＥＧＲ方弐においては、吸気通路も
しくは排気通路にバタフライ弁よりなる絞り弁を設け、
この絞り弁によって吸気絞りもしくは排気絞りを行なう
ことによってＥＧＲｉｌを制御している．この場合、例
えば吸気絞りにおける吸気絞り弁と、この吸気絞り弁下
流の吸気圧力との関係は第５図に示すようなカーブにな
り、吸気絞り弁の開度と、吸気通路の開口面積との関係
がリニアにならず、途中で急激に変化する．したがって
開口面積が急激に変化する絞り弁の開度領域では、ＥＧ
Ｒ量の精密な制御が困難であるという問題があった．
（発明の目的）
そこで本発明は、内部ＥＧＲ方式においてＥＧＲ量の制
御精度を高めることができるＥＧＲ制御装置を提供する
ことを目的とする。By the way, in the internal EGR method 2, a throttle valve made of a butterfly valve is provided in the intake passage or the exhaust passage,
EGRil is controlled by restricting the intake air or exhaust air using this throttle valve. In this case, for example, the relationship between the intake throttle valve in the intake throttle and the intake pressure downstream of this intake throttle valve becomes a curve as shown in Figure 5, and the relationship between the opening degree of the intake throttle valve and the opening area of the intake passage becomes The relationship is not linear and changes rapidly along the way. Therefore, in the opening range of the throttle valve where the opening area changes rapidly, the EG
There was a problem in that precise control of the amount of R was difficult. (Object of the Invention) Therefore, an object of the present invention is to provide an EGR control device that can improve the control accuracy of the EGR amount in an internal EGR method.
（発明の構成）
請求項ｌに記載された発明は、ディーゼルエンジンの吸
気通路もしくは排気通路に、エンジンの運転状態に応じ
てＥＧＲ量を制御する′＃Ｉ１御バルブを設け、この制
御バルブを、それの開閉に伴う上記吸気通路もしくは排
気通路の開口面積変化が小さい開度領域内において作動
させることを特徴とする．
また請求項２に記載された発明は、請求項１における制
御バルブに加えて、他の内部ＥＧＲ量調整手段を設け、
この調整手段を、上記制御バルブの上記開口面積変化が
小さい開度領域内での作動に伴って、エンジンの運転状
態に応じて作動させることを特徴とする。(Structure of the Invention) The invention described in claim 1 is characterized in that a '#I1 control valve is provided in the intake passage or exhaust passage of a diesel engine to control the amount of EGR according to the operating state of the engine, and this control valve is configured to: It is characterized in that it operates within an opening range where the change in opening area of the intake passage or exhaust passage due to opening and closing of the intake passage or exhaust passage is small. Further, the invention described in claim 2 provides, in addition to the control valve in claim 1, another internal EGR amount adjustment means,
The adjustment means is characterized in that the control valve is operated in an opening range where the change in opening area is small, and is operated in accordance with the operating state of the engine.
（発明の効果）
請求項１に記載された発明によれば、ＥＧＲ量を制御す
る制御バルブを、それの吸気通路もしくは排気通路の開
口面積変化が小さい開度領域内において作動させている
ので、ＥＧＲ量の制御精度を高めることができる。(Effects of the Invention) According to the invention described in claim 1, the control valve that controls the EGR amount is operated within the opening range where the change in the opening area of the intake passage or the exhaust passage is small. It is possible to improve the control accuracy of the EGR amount.
また、請求項２に記載された発明によれば、ＥＧＲ量の
制御精度を保ちつつ、エンジンの運転状態に即した大幅
なＥＧＲ制御も可能になる。Further, according to the invention described in claim 2, it is possible to perform extensive EGR control in accordance with the operating state of the engine while maintaining control accuracy of the EGR amount.
（実 施 例）
以下、図面を参照して本発明の実施例について詳細に説
明する．
第１図は本発明の一実施例を示す概略的構成図で、エン
ジン１には、エアクリーナ２を通った吸気を各気簡の燃
焼室に供給する吸気通路３と、燃焼によって生じた排気
ガスを外部に排出する排気通路４とが設けられている．
吸気通路３には、吸気を絞ることによって内部ＥＧＲを
行なうための吸気絞り弁５が設けられているとともに、
この絞り弁１０を開閉駆動する負圧ダイヤフラム式のア
クチュエータ６が設けられているとともに、負圧ポンプ
（図示は省略）とアクチュエータ６との間の負圧導入通
路７に、デューティ制御式の負圧制御弁８が配設され、
この制御弁８の開閉状態および開閉時間比率（デューテ
ィ比）に応じてアクチュエータ６内の負圧が制御される
ことにより、吸気絞り弁５の開度が制御されるようにな
っている。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention. An engine 1 includes an intake passage 3 that supplies intake air that has passed through an air cleaner 2 to each combustion chamber, and an exhaust gas produced by combustion. An exhaust passage 4 is provided for discharging the water to the outside.
The intake passage 3 is provided with an intake throttle valve 5 for performing internal EGR by restricting intake air.
A negative pressure diaphragm type actuator 6 is provided to open and close the throttle valve 10, and a duty-controlled negative pressure is provided in a negative pressure introduction passage 7 between a negative pressure pump (not shown) and the actuator 6. A control valve 8 is provided,
The opening degree of the intake throttle valve 5 is controlled by controlling the negative pressure within the actuator 6 according to the open/close state and the open/close time ratio (duty ratio) of the control valve 8.
Claims (1)
、エンジンの運転状態に応じて排気ガス還流量を制御す
る制御バルブを設け、この制御バルブを、それの開閉に
伴う上記吸気通路もしくは排気通路の開口面積変化が小
さい開度領域内において作動させることを特徴とするデ
ィーゼルエンジンの排気ガス還流制御装置。 ２、上記制御バルブに加えて、他の排気ガス内部還流量
調整手段を設け、この調整手段を、上記制御バルブの上
記開口面積変化が小さい開度領域内での作動に伴って、
エンジンの運転状態に応じて作動させることを特徴とす
る請求項１記載の装置。[Claims] 1. A control valve for controlling the amount of exhaust gas recirculation according to the operating state of the engine is provided in the intake passage or exhaust passage of the diesel engine, and the control valve is controlled in the intake passage as the control valve opens and closes. Alternatively, an exhaust gas recirculation control device for a diesel engine is characterized in that it is operated in an opening range where the change in the opening area of the exhaust passage is small. 2. In addition to the control valve, another exhaust gas internal recirculation amount adjustment means is provided, and this adjustment means is operated in an opening range where the change in the opening area of the control valve is small,
2. The device according to claim 1, wherein the device is activated depending on the operating state of the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1232978A JPH0396652A (en) | 1989-09-11 | 1989-09-11 | Exhaust gas reflux controller of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1232978A JPH0396652A (en) | 1989-09-11 | 1989-09-11 | Exhaust gas reflux controller of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0396652A true JPH0396652A (en) | 1991-04-22 |
Family
ID=16947875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1232978A Pending JPH0396652A (en) | 1989-09-11 | 1989-09-11 | Exhaust gas reflux controller of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0396652A (en) |
-
1989
- 1989-09-11 JP JP1232978A patent/JPH0396652A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2001164965A (en) | Engine control device | |
| EP2527630A3 (en) | Controller for an internal combustion engine with variable valve mechanism | |
| JPS639103B2 (en) | ||
| JPS6118659B2 (en) | ||
| EP1046801A3 (en) | Exhaust gas recirculation control system for engine | |
| JPS6143543B2 (en) | ||
| US4185607A (en) | Dual displacement engine control | |
| JPH0396652A (en) | Exhaust gas reflux controller of diesel engine | |
| JPH01100316A (en) | Intake-air device of internal combustion engine | |
| JPH03100361A (en) | Exhaust gas circular controller of diesel engine | |
| JP3005718B2 (en) | Exhaust gas recirculation control system for diesel engine | |
| GB2156431A (en) | Exhaust-gas recirculation control system for an internal combustion engine | |
| JPH03105042A (en) | Fuel injection controller of diesel engine | |
| JPS6030444Y2 (en) | Engine secondary air supply system | |
| JPS6117228Y2 (en) | ||
| JPS6345493B2 (en) | ||
| JPS6040849Y2 (en) | Diesel engine exhaust recirculation device | |
| JPH031254U (en) | ||
| JP3908435B2 (en) | Supercharging prevention device for supercharged engine | |
| JPH0223804Y2 (en) | ||
| JPS59120770A (en) | Egr control device of internal-combustion engine | |
| JPH0113790Y2 (en) | ||
| JPS5823972Y2 (en) | Exhaust gas recirculation control device for internal combustion engines | |
| JP2606285Y2 (en) | Swirl control device for diesel engine | |
| JPH08121262A (en) | Exhaust gas recirculation control valve |