JPH03100361A - Exhaust gas circular controller of diesel engine - Google Patents
Exhaust gas circular controller of diesel engineInfo
- Publication number
- JPH03100361A JPH03100361A JP1232981A JP23298189A JPH03100361A JP H03100361 A JPH03100361 A JP H03100361A JP 1232981 A JP1232981 A JP 1232981A JP 23298189 A JP23298189 A JP 23298189A JP H03100361 A JPH03100361 A JP H03100361A
- Authority
- JP
- Japan
- Prior art keywords
- engine
- egr
- exhaust
- exhaust gas
- sensor
- 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000000779 smoke Substances 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 abstract description 2
- 230000001133 acceleration Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 1
- 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
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)
- Output Control And Ontrol Of Special Type Engine (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(EGR)
制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to exhaust gas recirculation (EGR) of diesel engines.
Regarding a control device.
(従来技術)
ディーゼルエンジンのNo、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EGR量を変え、これにより
NO8の低減を図るものである(外部EGR方式)。(Conventional technology) EGR as the No. 1 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. The amount of EGR is changed by controlling according to the amount of fuel, thereby reducing NO8 (external EGR method).
このような外部EGR制御システムでは、一般に出力値
が直線的に変化する酸素センサ(リニア0、センサ)を
排気通路に設けるとともに、エンジン回転数とアクセル
開度によって定まるエンジンの運転状態に応じた目標酸
素濃度をあられすマツプを用意し、このマツプから読み
出される目標酸素濃度と上記酸素センサの出力から求め
られる実酸素濃度との比較にもとづいてEGR弁のリフ
ト量を決定して、EGR3lを制御するようになってい
る(特開昭63−201356号公報参照)。In such an external EGR control system, an oxygen sensor (linear 0 sensor) whose output value changes linearly is generally installed in the exhaust passage, and a target is set according to the engine operating state determined by the engine speed and accelerator opening. A map for determining oxygen concentration is prepared, and the EGR valve is controlled by determining the lift amount of the EGR valve based on a comparison between the target oxygen concentration read from this map and the actual oxygen concentration determined from the output of the oxygen sensor. (See Japanese Unexamined Patent Publication No. 63-201356).
ところで、上記外部EGI?は、いわゆるEGRガス温
度が低いコールドEGRであるため、低回転、低負荷領
域において着火性の悪化および白煙の発生を招く欠点が
あり、低回転、低負荷領域ではEGRliを増加させる
ことができず、したがってNo、を充分に低減すること
ができなかった。By the way, the above external EGI? Since it is a so-called cold EGR with a low EGR gas temperature, it has the disadvantage of worsening ignition performance and generating white smoke in low rotation and low load areas, and cannot increase EGRli in low rotation and low load areas. Therefore, it was not possible to sufficiently reduce No.
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
ラツプにもとづき、−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。この内部EGR方式は、ホット
EGRとも呼ばれており、残留ガスの温度が比較的高い
ために低回転、低負荷域における着火性は向上するが、
低回転、高負荷領域では、NO8低減率が低下し、また
、エンジンの運転状態に応じた精度の高いEGRI制御
は不可能であった。On the other hand, there is an internal EGR method in which part of the exhaust gas after combustion remains in the combustion chamber. This method is based on the overlap of the opening periods of the intake and exhaust valves from the end of the exhaust stroke to the beginning of the intake stroke, and the exhaust gas that has previously exited to the exhaust passage is pulled back into the combustion chamber or intake passage by the intake negative pressure, and the remaining gas is That is. This internal EGR method is also called hot EGR, and because the temperature of the residual gas is relatively high, ignition performance in low rotation and low load ranges is improved.
In the low-speed, high-load region, the NO8 reduction rate decreases, and highly accurate EGRI control according to the operating state of the engine is impossible.
(発明の目的)
そこで本発明は、エンジンの運転状態に応じて内部EG
Rilを高精度をもって制御してNo、排出量を低減す
ることができるディーゼルエンジンのEGR制御装置を
提供することを目的とする。(Objective of the Invention) Therefore, the present invention provides an internal EG control system according to the operating state of the engine.
An object of the present invention is to provide an EGR control device for a diesel engine that can reduce emissions by controlling Ril with high precision.
(発明の構成)
本発明によるEGR制御装置は、排気系における酸素濃
度を検出する酸素センサと、内部EGR量を調整する調
整手段と、上記酸素センサからの出力信号にもとづき、
上記EGR量調整手段をエンジンの運転状態に応じて制
御する制御手段とを備えていることを特徴とする。(Structure of the Invention) The EGR control device according to the present invention includes an oxygen sensor that detects the oxygen concentration in the exhaust system, an adjustment means that adjusts the internal EGR amount, and an output signal from the oxygen sensor.
The present invention is characterized by comprising a control means for controlling the EGR amount adjusting means according to the operating state of the engine.
(発明の効果)
本発明によれば、内部EGRfJを酸素センサの出力で
間接的に検知できるため、エンジンの運転状態に即した
高精度の内部ECR制御を行なうことができ、これによ
り、広い運転域に亘ってco、HC、スモーク等の排出
を抑制しつつNOx排気量を低減させることができる。(Effects of the Invention) According to the present invention, since the internal EGRfJ can be detected indirectly by the output of the oxygen sensor, it is possible to perform highly accurate internal ECR control in accordance with the operating state of the engine. It is possible to reduce the amount of NOx emissions while suppressing emissions of CO, HC, smoke, etc. throughout the region.
(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。(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
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筒の燃
焼室に供給する吸気通路3と、燃焼によって生した排気
ガスを外部に排出する排気通路4とが設けられている。FIG. 1 is a schematic configuration diagram showing one 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 a combustion chamber of each cylinder, and an intake passage 3 that supplies exhaust gas produced by combustion. An exhaust passage 4 for discharging the air to the outside is provided.
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、デユ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(デユーテ
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。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 control type 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.
また、排気通路4には、出力値が直線的に変化するりニ
ア02センサ9が配設されている。Further, a near-02 sensor 9 whose output value changes linearly is disposed in the exhaust passage 4.
Claims (1)
ンサからの出力信号にもとづき、上記排気ガス内部還流
量調整手段をエンジンの運転状態に応じて制御する制御
手段と を備えてい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。[Scope of Claims] An oxygen sensor that detects the oxygen concentration in the exhaust system, an adjustment device that adjusts the amount of internal recirculation of exhaust gas, and an adjustment device that adjusts the amount of internal recirculation of the exhaust gas based on the output signal from the oxygen sensor. 1. An exhaust gas recirculation control device for a diesel engine, comprising: control means for controlling according to the operating state of the diesel engine.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1232981A JPH03100361A (en) | 1989-09-11 | 1989-09-11 | Exhaust gas circular controller of diesel engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1232981A JPH03100361A (en) | 1989-09-11 | 1989-09-11 | Exhaust gas circular controller of diesel engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03100361A true JPH03100361A (en) | 1991-04-25 |
Family
ID=16947925
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1232981A Pending JPH03100361A (en) | 1989-09-11 | 1989-09-11 | Exhaust gas circular controller of diesel engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03100361A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2687730A1 (en) * | 1992-02-21 | 1993-08-27 | Renault | Device for introducing additional gases for an internal combustion engine |
EP0598683A1 (en) * | 1992-11-17 | 1994-05-25 | IVECO FIAT S.p.A. | A method for the adjustment of an electronic control system for the fuel supply to a diesel-cycle engine installed on a motorvehicle |
EP1052387A3 (en) * | 1999-05-08 | 2002-05-02 | DEUTZ Aktiengesellschaft | Method for operating an exhaust gas recirculation device in an internal combustion engine |
WO2006073091A1 (en) * | 2005-01-05 | 2006-07-13 | Yamaha Hatsudoki Kabushiki Kaisha | Direct injection diesel engine |
GB2519600B (en) * | 2013-10-28 | 2018-09-12 | Jaguar Land Rover Ltd | Gasoline Engine Knock Control |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5128482U (en) * | 1974-08-24 | 1976-03-01 | ||
JPS63201356A (en) * | 1987-02-16 | 1988-08-19 | Nippon Denso Co Ltd | Exhaust gas recirculation control device for diesel engine |
-
1989
- 1989-09-11 JP JP1232981A patent/JPH03100361A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5128482U (en) * | 1974-08-24 | 1976-03-01 | ||
JPS63201356A (en) * | 1987-02-16 | 1988-08-19 | Nippon Denso Co Ltd | Exhaust gas recirculation control device for diesel engine |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2687730A1 (en) * | 1992-02-21 | 1993-08-27 | Renault | Device for introducing additional gases for an internal combustion engine |
EP0598683A1 (en) * | 1992-11-17 | 1994-05-25 | IVECO FIAT S.p.A. | A method for the adjustment of an electronic control system for the fuel supply to a diesel-cycle engine installed on a motorvehicle |
EP1052387A3 (en) * | 1999-05-08 | 2002-05-02 | DEUTZ Aktiengesellschaft | Method for operating an exhaust gas recirculation device in an internal combustion engine |
WO2006073091A1 (en) * | 2005-01-05 | 2006-07-13 | Yamaha Hatsudoki Kabushiki Kaisha | Direct injection diesel engine |
GB2519600B (en) * | 2013-10-28 | 2018-09-12 | Jaguar Land Rover Ltd | Gasoline Engine Knock Control |
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