JPH08121154A - Engine exhaust emission control method and device thereof - Google Patents
Engine exhaust emission control method and device thereofInfo
- Publication number
- JPH08121154A JPH08121154A JP6284328A JP28432894A JPH08121154A JP H08121154 A JPH08121154 A JP H08121154A JP 6284328 A JP6284328 A JP 6284328A JP 28432894 A JP28432894 A JP 28432894A JP H08121154 A JPH08121154 A JP H08121154A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- load
- engine
- amount
- egr
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はエンジンの排気ガス浄化
方法および装置の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in an engine exhaust gas purification method and apparatus.
【０００２】[0002]
【従来の技術】従来は、この種のエンジンの排気ガス浄
化装置として、例えば、特開平３−７４５６０号公報に
開示されているように、吸気系への排気ガスの還流量を
調整するＥＧＲ装置の上流側の排気ガスの温度と、ＮＯ
x 浄化触媒の上流側の排気ガスの温度とを検知して、排
気ガスの還流量を制御することにより、排気ガスを適切
な排気温度になるように調整するＥＧＲ制御手段が知ら
れている。また、高温時で高活性化する還元剤を触媒に
供給することにより、ＮＯx 浄化触媒による排気ガス浄
化も知られている。2. Description of the Related Art Conventionally, as an exhaust gas purifying apparatus for an engine of this type, as disclosed in, for example, Japanese Patent Application Laid-Open No. 3-74560, an EGR apparatus for adjusting the recirculation amount of exhaust gas to an intake system. Of exhaust gas on the upstream side of NO and NO
x There is known an EGR control means for detecting the temperature of exhaust gas on the upstream side of the purification catalyst and controlling the recirculation amount of the exhaust gas to adjust the exhaust gas to an appropriate exhaust temperature. It is also known to purify exhaust gas with a NOx purification catalyst by supplying a reducing agent that is highly activated at high temperature to the catalyst.
【０００３】[0003]
【発明が解決しようとする課題】これらのエンジンの排
気浄化装置は、エンジン負荷全域で単独に使用すると各
々のもつ効果は得られるが、不具合な点も出てくる。す
なわち、排気ガスの一部を再び吸気に還流させるＥＧＲ
装置のみで使用すると、混合気中において比熱の大きい
ＣＯ2 濃度が増加し、燃焼時の温度の低減によりＮＯx
の低減ができる。しかし、Ｏ2 濃度が減少するため空気
の十分でない高負荷領域では排煙濃度およびＨＣが増加
して排気中の黒煙や硫黄酸化物が再度エンジン内部に吸
入されてピストン、シリンダまわりの摩耗耐久性、エン
ジンオイル寿命に悪影響を与える。一方、排気浄化装置
のみで使用すると、高負荷領域の排気ガス温度が高い所
ではＮＯx の低減の効果は得られるが、低負荷領域では
排気ガス温度が低いため、反応が十分行われずＮＯx 低
減を図ることができない。そこで、高負荷領域での使用
に限られてしまう。ところで、上述したとおり、ＮＯx
浄化触媒によるエンジンの排気浄化とＥＧＲ制御による
エンジンの排気浄化は、排気ガスの温度により各々の効
果が違って全負荷領域において一様でない。そこで、高
負荷時と中・低負荷時とにおいて、エンジン排気浄化方
式を使い分けるエンジンの排気ガス浄化方法および装置
の改良を提供するにことを目的とする。When these exhaust emission control systems for engines are used independently over the entire engine load, the respective effects can be obtained, but some drawbacks also arise. That is, EGR that recirculates part of the exhaust gas back to the intake air
If it is used only in the system, the concentration of CO2, which has a large specific heat in the air-fuel mixture, will increase and NOx will be reduced due to the decrease in the temperature during combustion.
Can be reduced. However, since the O2 concentration decreases, the smoke concentration and HC increase in the high load region where the air is not sufficient, and the black smoke and sulfur oxides in the exhaust gas are sucked into the engine again and the wear durability around the piston and cylinder is improved. , It adversely affects the engine oil life. On the other hand, if it is used only in the exhaust purification system, the effect of reducing NOx can be obtained in a place where the exhaust gas temperature in the high load region is high, but the exhaust gas temperature is low in the low load region, so the reaction does not occur sufficiently and NOx reduction is achieved. I can't plan. Therefore, it is limited to use in a high load area. By the way, as mentioned above, NOx
The effects of the engine exhaust purification by the purification catalyst and the engine exhaust purification by EGR control are not uniform in the entire load region because the respective effects differ depending on the temperature of the exhaust gas. Therefore, it is an object of the present invention to provide an engine exhaust gas purification method and an improved engine exhaust gas purification method, in which the engine exhaust purification method is selectively used for high load and medium / low load.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係るディーゼルエンジンの排気ガス浄化方
法は、エンジンの排気系統にＮＯx 浄化触媒を備えたデ
ィーゼルエンジン排気ガス浄化方法において、エンジン
回転数と燃料噴射量を検出し、この検出値を受けて現在
の負荷状態を判別し、高負荷の場合は、直接、ＮＯx 浄
化触媒を経て排気ガスを放出し、中・低負荷の場合は、
ＥＧＲ装置を用いて排気ガスの一部を吸気管に還流する
ことを特徴としている。In order to achieve the above object, a method for purifying exhaust gas of a diesel engine according to the present invention is a method for purifying exhaust gas of a diesel engine in which an NOx purifying catalyst is provided in an exhaust system of the engine. The engine speed and fuel injection amount are detected, and the current load state is determined based on the detected values. When the load is high, exhaust gas is directly emitted through the NOx purification catalyst, and when the load is medium or low, ,
The EGR device is used to recirculate a part of the exhaust gas to the intake pipe.
【０００５】また、第２の発明に係るディーゼルエンジ
ンの排気ガス浄化装置は、エンジンの排気系統にＮＯx
浄化触媒を備えたディーゼルエンジン排気ガス浄化装置
において、吸気系統への排気ガスの還流量を調整するＥ
ＧＲ装置と、ＮＯx浄化触媒への還元剤供給量を調整す
る装置と、エンジン回転数検出器と、燃料の噴射量の検
出する燃料噴射量検出器と、これらの検出手段にて検出
された信号を受けて負荷状態を判定し、高負荷時と判断
された時は、ＮＯx 浄化触媒に還元剤を供給する量を、
中・低負荷時と判断された時は、吸気管へのＥＧＲ還流
量をそれぞれ負荷に応じて制御する制御手段とを備える
ことを特徴としている。また上記において、燃料噴射量
検出器がスロットルの開度量を検出するスロットル開度
検出器、あるいは、ラックの位置を検出するラック位置
検出器からなる。Further, in the exhaust gas purifying apparatus for a diesel engine according to the second aspect of the invention, NOx is added to the exhaust system of the engine.
In a diesel engine exhaust gas purification device equipped with a purification catalyst, E for adjusting the amount of exhaust gas recirculation to the intake system
GR device, device for adjusting reducing agent supply amount to NOx purification catalyst, engine speed detector, fuel injection amount detector for detecting fuel injection amount, and signals detected by these detecting means In response to this, the load condition is determined, and when it is determined that the load is high, the amount of reducing agent supplied to the NOx purification catalyst is changed to
When it is determined that the load is medium or low, a control means for controlling the amount of EGR recirculation to the intake pipe according to the load is provided. Further, in the above, the fuel injection amount detector is composed of a throttle opening amount detector for detecting the throttle opening amount or a rack position detector for detecting the rack position.
【０００６】[0006]
【作用】上記構成により、エンジンの高負荷時では、排
気経路を経てＮＯx 浄化触媒から大気に排気ガスを、中
・低負荷時ではＥＧＲ装置を経て排気ガスを吸気管側に
還流させ、熱容量を高めるとともに、燃焼時の燃焼ガス
の燃焼最高温度を低下させることによりＮＯx を低減で
きる。With the above structure, when the engine has a high load, the exhaust gas is returned from the NOx purification catalyst to the atmosphere via the exhaust path, and when the engine has a medium or low load, the exhaust gas is returned to the intake pipe side via the EGR device to reduce the heat capacity. NOx can be reduced by increasing the temperature and lowering the maximum combustion temperature of the combustion gas during combustion.
【０００７】[0007]
【実施例】以下に本発明に係るディーゼルエンジンの排
気ガス浄化方法および装置の具体的実施例を図面を参照
して詳細に説明する。図１は実施例に係るエンジンの排
気ガス浄化装置がディーゼルエンジン１に適用された場
合の全体構成を示す。同図において、ディーゼルエンジ
ン１には、空気を吸入するための吸気管２がディーゼル
エンジン１の図示しない各シリンダへ空気を配給するイ
ンテークマニホールド３を介して付設されている。ま
た、ディーゼルエンジン１には、図示しない各シリンダ
から排出される排気ガスを集合するエグゾーストマニホ
ールド４が付設されている。エグゾーストマニホールド
４には排気ガスを排出する排気管５が接続され、排気管
５には排気ガス中のＮＯx を還元するＮＯx 浄化装置６
が配設されている。吸気管３と排気管５との間は、排気
管５内の排気ガスを吸気管３に還流するＥＧＲ通路７で
接続されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of a diesel engine exhaust gas purification method and device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an overall configuration when an exhaust gas purifying apparatus for an engine according to an embodiment is applied to a diesel engine 1. In FIG. 1, an intake pipe 2 for sucking air is attached to a diesel engine 1 via an intake manifold 3 that distributes air to each cylinder (not shown) of the diesel engine 1. The diesel engine 1 is also provided with an exhaust manifold 4 that collects exhaust gas discharged from each cylinder (not shown). An exhaust pipe 5 for exhausting exhaust gas is connected to the exhaust manifold 4, and an NOx purification device 6 for reducing NOx in the exhaust gas is connected to the exhaust pipe 5.
Is provided. The intake pipe 3 and the exhaust pipe 5 are connected by an EGR passage 7 that recirculates the exhaust gas in the exhaust pipe 5 to the intake pipe 3.
【０００８】また、ディーゼルエンジン１には、エンジ
ンの回転数を検出するエンジン回転数検出器８と、ディ
ーゼルエンジン１への燃料の噴射量の検出するスロット
ル開度検出器等の燃料噴射量検出器９が配設されてい
る。上記の燃料噴射量検出器９は、ラックの位置を検出
するラック位置検出器でも良い。エンジン回転数検出器
８と燃料噴射量検出器９とは制御装置１０に接続されて
いる。制御装置１０は、前記検出器にて検出された信号
が入力され、後述するフローチャートにしたがって後述
するＥＧＲ制御弁１１を制御する制御信号ｉ1 、およ
び、ＮＯx 浄化装置６への還元剤供給量を調節する制御
信号ｉ2 を出力する。ＥＧＲ通路７にはＥＧＲ制御弁１
１が配設され、ＥＧＲ制御弁１１は制御装置１０からの
指令によりＥＧＲ通路７を経て吸気管２へ還流する排気
ガスの量を調整している。Further, the diesel engine 1 includes an engine speed detector 8 for detecting the engine speed and a fuel injection amount detector such as a throttle opening detector for detecting the amount of fuel injected into the diesel engine 1. 9 are provided. The fuel injection amount detector 9 may be a rack position detector that detects the position of the rack. The engine speed detector 8 and the fuel injection amount detector 9 are connected to the control device 10. The control device 10 receives the signal detected by the detector and adjusts the control signal i1 for controlling the EGR control valve 11 described later according to the flowchart described later and the reducing agent supply amount to the NOx purification device 6. Output the control signal i2. The EGR control valve 1 is provided in the EGR passage 7.
1 is provided, and the EGR control valve 11 adjusts the amount of exhaust gas recirculated to the intake pipe 2 via the EGR passage 7 in response to a command from the control device 10.
【０００９】排気管５には排気ガス中のＮＯx を還元す
る還元剤を供給する還元剤供給ノズル１３が配設されて
いる。還元剤はディーゼルエンジン１の燃料である軽油
を使用している。その還元剤供給ノズル１３はそのＮＯ
x 浄化装置６の上流側において、その排気管５の途中に
配置されたところのチャンバ１４に配置され、そして、
そのディーゼルエンジン１の燃料供給ポンプ１５から配
管１８、還元剤供給調整弁１７、配管１９を経て燃料が
供給される。還元剤供給調整弁１７は、弁開度が絞り調
整される電磁弁が使用され、排気ガス中のＮＯx 低減の
ため還元剤供給量を調整する弁である。還元剤供給ノズ
ル１３はその空気圧源１６に配管２１、空気量調整弁１
２、配管２０を経て接続されている。本発明は必ずしも
空気圧源、空気量調整弁を必要としない。The exhaust pipe 5 is provided with a reducing agent supply nozzle 13 for supplying a reducing agent for reducing NOx in the exhaust gas. As the reducing agent, light oil which is a fuel for the diesel engine 1 is used. The reducing agent supply nozzle 13 has the NO
x It is arranged in the chamber 14 which is arranged in the middle of the exhaust pipe 5 on the upstream side of the purification device 6, and
Fuel is supplied from the fuel supply pump 15 of the diesel engine 1 through the pipe 18, the reducing agent supply adjusting valve 17, and the pipe 19. The reducing agent supply adjusting valve 17 is a valve that uses an electromagnetic valve whose valve opening is adjusted to be reduced, and adjusts the reducing agent supply amount for reducing NOx in the exhaust gas. The reducing agent supply nozzle 13 has an air pressure source 16, a pipe 21, and an air amount adjusting valve 1.
2. Connected via a pipe 20. The present invention does not necessarily require an air pressure source and an air amount adjusting valve.
【００１０】ＮＯx 浄化装置６の還元触媒は、例えば、
セラミック粉末から成形され、乾燥および焼成のプロセ
スを経て、両端を開放した多数のセルからなるハニカム
構造に製造されたキャリアを含み、そのキャリアに坦持
されてあって、ゼオライト系（Ｃｕ−ＺＳＨ5 、Ｃｕ−
モルナイト、他）が使用される。The reduction catalyst of the NOx purification device 6 is, for example,
The carrier includes a carrier formed from a ceramic powder, subjected to a process of drying and firing, and manufactured into a honeycomb structure composed of a large number of cells whose both ends are open. The carrier is carried by the carrier and has a zeolite system (Cu-ZSH5, Cu-
Mornite, etc.) is used.
【００１１】次に、図３のフローチャートに基づき、Ｅ
ＧＲ制御弁１１とＮＯx浄化装置６への還元剤供給量調
整弁１７の各々の制御について説明する。ステップＳ１
でエンジン回転数と燃料噴射量を検出し、ステップＳ２
でこれらの検出結果からエンジン負荷を算出する。その
結果、ステップＳ３で現在の負荷が高負荷なのか、それ
とも中・低負荷なのかを、例えば、図２にしたがって判
断する。図２は横軸にエンジンの回転数を、縦軸にエン
ジン出力トルクを、また双曲線でエンジン等馬力線を示
す図である。図２のように、ディゼルエンジン１にかか
る負荷がエンジン等馬力曲線の分岐曲線Ｐ−Ｐを境に高
負荷域（斜線部Ａ）と中・低負荷域（Ｂ）とに設定さ
れ、それがマップにメモリされている。いま、燃料噴射
量検出器９からのエンジン負荷Ｔ１と実回転数ｎ1 との
交点Ｙ１を求め、この交点Ｙ１が、分岐曲線Ｐ−Ｐを境
に右側（Ａ）にあるため高負荷域と判断し、また、エン
ジン負荷Ｔ２と実回転数ｎ2 との交点Ｙ２を求め、この
交点Ｙ２が、分岐曲線Ｐ−Ｐを境に左側（Ｂ）にあるた
め中・低負荷域と判断する。Next, based on the flowchart of FIG. 3, E
Each control of the GR control valve 11 and the reducing agent supply amount adjustment valve 17 to the NOx purification device 6 will be described. Step S1
The engine speed and the fuel injection amount are detected at step S2
The engine load is calculated from these detection results. As a result, in step S3, it is determined according to, for example, FIG. 2 whether the current load is a high load or medium / low load. FIG. 2 is a diagram showing the engine speed on the abscissa, the engine output torque on the ordinate, and the engine horsepower line on the hyperbola. As shown in FIG. 2, the load applied to the diesel engine 1 is set to a high load range (shaded area A) and a medium / low load range (B) with a bifurcation curve P-P of an engine horsepower curve as a boundary. It is stored in the map. Now, an intersection Y1 between the engine load T1 from the fuel injection amount detector 9 and the actual rotation speed n1 is obtained. Since this intersection Y1 is on the right side (A) with the branch curve P-P as the boundary, it is determined to be a high load region. Further, an intersection Y2 between the engine load T2 and the actual rotation speed n2 is obtained, and since this intersection Y2 is on the left side (B) with the bifurcation curve P-P as the boundary, it is determined to be in the middle / low load region.
【００１２】また、交点Ｙ１通るエンジン等馬力曲線Ｌ
１を求め、このエンジン等馬力曲線Ｌ１の大小により、
制御装置１０はＮＯx 浄化装置７への還元剤の供給量、
あるいは、吸気管２へ還流する排気ガスの量を制御して
いる。例えば、交点Ｙ１では、高負荷域（Ａ）内にある
ので、ステップＳ４で図２の負荷とエンジン回転数との
対応を示すマップからＮＯx低減のための還元剤供給量
Ｌ１を読み取る。Further, an engine equal horsepower curve L passing through the intersection Y1
1 is obtained, and by the magnitude of this engine horsepower curve L1,
The control device 10 supplies the reducing agent to the NOx purification device 7,
Alternatively, the amount of exhaust gas recirculated to the intake pipe 2 is controlled. For example, at the intersection Y1, since it is in the high load range (A), the reducing agent supply amount L1 for NOx reduction is read from the map showing the correspondence between the load and the engine speed in FIG. 2 in step S4.
【００１３】次いで、ステップＳ５で還元剤供給量調整
弁１７の開度量を制御する信号ｉ1および空気量調整弁
１２の開度量を制御する信号値ｉ2 を出力する。ステッ
プＳ３で、中・低負荷の交点Ｙ１では、図２の負荷とエ
ンジン回転数に対応するＥＧＲ量が定まるマップから吸
気管２へのＥＧＲ制御量を読み取る。次いで、ステップ
５でＥＧＲ制御弁１１の開度量を制御する信号値ｉ3 を
決定する。高負荷時では、制御装置１０から出力される
制御信号ｉ1 、ｉ2 に応じて還元剤供給量調整弁１７お
よび空気量調整弁１２の開度量を制御することにより還
元剤の量を調整してノズル１３より噴射される。中・低
負荷時では、制御装置１０から出力される制御信号ｉ3
に応じてＥＧＲ制御弁１１の開度量を制御することによ
り吸気管３へ還流する排気ガスの量を調整する。Then, in step S5, a signal i1 for controlling the opening amount of the reducing agent supply amount adjusting valve 17 and a signal value i2 for controlling the opening amount of the air amount adjusting valve 12 are output. In step S3, at the intersection Y1 of medium and low loads, the EGR control amount to the intake pipe 2 is read from the map shown in FIG. 2 where the EGR amount corresponding to the load and the engine speed is determined. Next, at step 5, the signal value i3 for controlling the opening amount of the EGR control valve 11 is determined. When the load is high, the amount of the reducing agent is adjusted by controlling the opening amounts of the reducing agent supply amount adjusting valve 17 and the air amount adjusting valve 12 according to the control signals i1 and i2 output from the control device 10. It is injected from 13. At the time of medium / low load, the control signal i3 output from the control device 10
The amount of exhaust gas recirculated to the intake pipe 3 is adjusted by controlling the opening amount of the EGR control valve 11 in accordance with the above.
【００１４】[0014]
【発明の効果】以上説明したように、本発明によれば、
エンジンの全域において高負荷または低負荷と判断した
結果、低負荷時では、混合気中において比熱の大きいＣ
Ｏ2濃度が増加し、燃焼時の温度低下によりＮＯx を低
減するＥＧＲ装置を使用し、一方、高負荷時では、高温
の排気ガスにより高活性が得られる触媒を通じて排気ガ
スを大気に放出するので、負荷に応じて最適なＮＯx 浄
化装置を選択可能にしたので効率的に大気汚染防止に寄
与するものである。As described above, according to the present invention,
As a result of judging that the load is high or low in the entire region of the engine, when the load is low, the specific heat C in the air-fuel mixture is large.
An EGR device that reduces NOx by increasing the O2 concentration and lowering the temperature during combustion is used. On the other hand, when the load is high, the exhaust gas is released to the atmosphere through a catalyst that is highly active due to the high temperature exhaust gas. Since the optimum NOx purification device can be selected according to the load, it contributes to the prevention of air pollution efficiently.
【図１】本発明の全体構成図である。FIG. 1 is an overall configuration diagram of the present invention.
【図２】エンジン負荷およびエンジン回転数に対応する
還元剤供給量マップを示す図である。FIG. 2 is a diagram showing a reducing agent supply amount map corresponding to engine load and engine speed.
【図３】ＥＧＲ制御装置の制御方法およびＮＯx 浄化装
置の還元剤供給制御方法のフローチャートを示す図であ
る。FIG. 3 is a diagram showing a flowchart of a control method of the EGR control device and a reducing agent supply control method of the NOx purification device.
１……エンジン、２……吸気管、３……インテークマニ
ホールド、４……エグゾーストマニホールド、５……排
気管、６……ＮＯx 浄化装置、７……ＥＧＲ通路、８…
…エンジン回転数検出器、９……スロットル開度検出
器、１０……制御装置、１１……ＥＧＲ制御弁、１２…
…空気量調整弁、１３……還元剤供給ノズル、１７……
還元剤供給量調整弁、１８，１９，２０，２１……配
管。1 ... Engine, 2 ... Intake pipe, 3 ... Intake manifold, 4 ... Exhaust manifold, 5 ... Exhaust pipe, 6 ... NOx purification device, 7 ... EGR passage, 8 ...
... Engine speed detector, 9 ... Throttle opening detector, 10 ... Control device, 11 ... EGR control valve, 12 ...
… Air amount adjusting valve, 13 …… Reducing agent supply nozzle, 17 ……
Reductant supply amount adjusting valve, 18, 19, 20, 21 ... Piping.
───────────────────────────────────────────────────── 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 Ｆ０２Ｍ 25/07 ５５０ Ｇ ５７０ Ｄ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location F02M 25/07 550 G 570 D
Claims (3)
備えたディーゼルエンジン排気ガス浄化方法において、
エンジン回転数と燃料噴射量を検出し、この検出値を受
けて現在の負荷状態を判別し、高負荷の場合は、直接、
ＮＯx 浄化触媒を経て排気ガスを放出し、中・低負荷の
場合は、ＥＧＲ装置を用いて排気ガスの一部を吸気管に
還流することを特徴とするディーゼルエンジンの排気ガ
ス浄化方法。1. A diesel engine exhaust gas purification method comprising an NOx purification catalyst in an engine exhaust system,
The engine speed and the fuel injection amount are detected, and the current load state is determined by receiving the detected values.
An exhaust gas purification method for a diesel engine, wherein exhaust gas is discharged through a NOx purification catalyst, and when the load is medium or low, an EGR device is used to recirculate a part of the exhaust gas to an intake pipe.
備えたディーゼルエンジン排気ガス浄化装置において、
吸気系統への排気ガスの還流量を調整するＥＧＲ装置
と、ＮＯx 浄化触媒への還元剤供給量を調整する装置
と、エンジン回転数検出器と、燃料の噴射量の検出する
燃料噴射量検出器と、これらの検出手段にて検出された
信号を受けて負荷状態を判定し、高負荷時と判断された
時は、ＮＯx 浄化触媒に還元剤を供給する量を、中・低
負荷時と判断された時は、吸気管へのＥＧＲ還流量をそ
れぞれ負荷に応じて制御する制御手段とを備えることを
特徴とするディーゼルエンジンの排気ガス浄化装置。2. A diesel engine exhaust gas purifying apparatus having an NOx purifying catalyst in an engine exhaust system,
An EGR device that adjusts the amount of exhaust gas recirculated to the intake system, a device that adjusts the amount of reducing agent supplied to the NOx purification catalyst, an engine speed detector, and a fuel injection amount detector that detects the fuel injection amount. When the load condition is judged by receiving the signals detected by these detecting means, and when it is judged that the load is high, it is judged that the amount of the reducing agent supplied to the NOx purification catalyst is at the middle or low load. The exhaust gas purifying apparatus for a diesel engine, comprising: a control unit that controls the EGR recirculation amount to the intake pipe according to the load when the engine is operated.
を検出するスロットル開度検出器、あるいは、ラックの
位置を検出するラック位置検出器からなる請求項２記載
のディーゼルエンジンの排気ガス浄化装置。3. The exhaust gas purifying apparatus for a diesel engine according to claim 2, wherein the fuel injection amount detector comprises a throttle opening detector for detecting a throttle opening amount or a rack position detector for detecting a rack position. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6284328A JPH08121154A (en) | 1994-10-24 | 1994-10-24 | Engine exhaust emission control method and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6284328A JPH08121154A (en) | 1994-10-24 | 1994-10-24 | Engine exhaust emission control method and device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08121154A true JPH08121154A (en) | 1996-05-14 |
Family
ID=17677144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6284328A Pending JPH08121154A (en) | 1994-10-24 | 1994-10-24 | Engine exhaust emission control method and device thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08121154A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0828063A1 (en) * | 1996-09-09 | 1998-03-11 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying device for engine |
| WO1999067511A1 (en) * | 1998-06-23 | 1999-12-29 | Toyota Jidosha Kabushiki Kaisha | Exhaust emission control device of internal combustion engine |
| EP0998625A1 (en) † | 1997-04-04 | 2000-05-10 | Clean Diesel Technologies Inc. | REDUCING NOx EMISSIONS FROM AN ENGINE WHILE MAXIMIZING FUEL ECONOMY |
| EP0919702A3 (en) * | 1997-11-07 | 2001-08-16 | Siemens Aktiengesellschaft | Process for reducing the NOx content of Diesel engine exhaust gas |
| WO2007026229A1 (en) * | 2005-09-02 | 2007-03-08 | Toyota Jidosha Kabushiki Kaisha | Exhaust purification device for internal combustion engine |
-
1994
- 1994-10-24 JP JP6284328A patent/JPH08121154A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0828063A1 (en) * | 1996-09-09 | 1998-03-11 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying device for engine |
| EP0998625A1 (en) † | 1997-04-04 | 2000-05-10 | Clean Diesel Technologies Inc. | REDUCING NOx EMISSIONS FROM AN ENGINE WHILE MAXIMIZING FUEL ECONOMY |
| EP0998625A4 (en) * | 1997-04-04 | 2000-07-05 | Clean Diesel Tech Inc | REDUCING NOx EMISSIONS FROM AN ENGINE WHILE MAXIMIZING FUEL ECONOMY |
| EP0998625B2 (en) † | 1997-04-04 | 2011-01-12 | Clean Diesel Technologies, Inc. | REDUCING NOx EMISSIONS FROM AN ENGINE WHILE MAXIMIZING FUEL ECONOMY |
| EP0919702A3 (en) * | 1997-11-07 | 2001-08-16 | Siemens Aktiengesellschaft | Process for reducing the NOx content of Diesel engine exhaust gas |
| WO1999067511A1 (en) * | 1998-06-23 | 1999-12-29 | Toyota Jidosha Kabushiki Kaisha | Exhaust emission control device of internal combustion engine |
| US6959540B2 (en) | 1998-06-23 | 2005-11-01 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device of internal combustion engine |
| US7086223B2 (en) | 1998-06-23 | 2006-08-08 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device of internal combustion engine |
| US7086222B2 (en) | 1998-06-23 | 2006-08-08 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device of internal combustion engine |
| US7272924B2 (en) | 1998-06-23 | 2007-09-25 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device of internal combustion engine |
| WO2007026229A1 (en) * | 2005-09-02 | 2007-03-08 | Toyota Jidosha Kabushiki Kaisha | Exhaust purification device for internal combustion engine |
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