JP2002256854A - Exhaust emission control device for internal combustion engine - Google Patents

Exhaust emission control device for internal combustion engine

Info

Publication number
JP2002256854A
JP2002256854A JP2001053896A JP2001053896A JP2002256854A JP 2002256854 A JP2002256854 A JP 2002256854A JP 2001053896 A JP2001053896 A JP 2001053896A JP 2001053896 A JP2001053896 A JP 2001053896A JP 2002256854 A JP2002256854 A JP 2002256854A
Authority
JP
Japan
Prior art keywords
exhaust
cylinder
reducing agent
internal combustion
combustion 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
Application number
JP2001053896A
Other languages
Japanese (ja)
Inventor
Akira Kotani
彰 小谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP2001053896A priority Critical patent/JP2002256854A/en
Publication of JP2002256854A publication Critical patent/JP2002256854A/en
Pending legal-status Critical Current

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
    • 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
    • Y02T10/40—Engine management systems

Landscapes

  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Supercharger (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust emission control device for an internal combustion engine less in adhesion of an injected reducing agent to an exhaust passage despite the injection of the reducing agent into an exhaust port. SOLUTION: This exhaust emission control device for a multicylindered internal combustion engine is provided with an NOx control means 11, which stores NOx in a lean operation and discharges the stored NOx in a rich operation to reduce, on an exhaust system. Further, the device has a cylinder 13a, in which an injector 17 for feeding the reducing agent is installed to prepare the rich operation in the exhaust port 14 of the cylinder 13 or directly in a cylinder 13, in a part of a plurality of cylinders. An exhaust pipe 16a communicating with the exhaust port 14a of the above cylinder 13a is prepared independently of the exhaust manifold 15b for the other cylinders 13b, and is converged with an exhaust pipe 16b communicating with the above exhaust manifold 15b at the upstream side of the NOx control means 11.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、内燃機関の排気浄
化装置に関する。The present invention relates to an exhaust gas purification device for an internal combustion engine.

【０００２】[0002]

【従来の技術】特開平６−２８０５４６号公報は、触媒
上流に還元剤を供給する内燃機関の排気浄化装置を開示
している。触媒が、リーンでＮＯｘを吸収しリーンで吸
収したＮＯｘをリッチで放出するＮＯｘ吸収材とリッチ
で放出したＮＯｘを還元する触媒成分を有するタイプの
触媒である場合、排気空燃比リッチを作るのに、ディー
ゼルエンジンでは、排気ポートに還元剤（ＨＣ）のイン
ジェクタを設けて還元剤を供給する。ガソリンエンジン
では筒内噴射でリッチスパイクを入れることにより排気
空燃比リッチを作ることができるが、ディーゼルエンジ
ンで筒内で還元剤を噴射するとトルクが出てしまうの
で、筒外で（排気ポートで）還元剤を噴射する。2. Description of the Related Art Japanese Patent Laying-Open No. 6-280546 discloses an exhaust gas purifying apparatus for an internal combustion engine that supplies a reducing agent upstream of a catalyst. When the catalyst is a type of catalyst having a NOx absorbent that absorbs NOx lean and releases NOx richly absorbed and a catalyst component that reduces NOx released richly, it is necessary to make the exhaust air-fuel ratio rich. In a diesel engine, a reducing agent (HC) injector is provided at an exhaust port to supply the reducing agent. In a gasoline engine, an exhaust air-fuel ratio can be made rich by injecting a rich spike by in-cylinder injection, but when a reducing agent is injected in a cylinder with a diesel engine, torque is generated, so outside the cylinder (at the exhaust port) Inject reducing agent.

【０００３】[0003]

【発明が解決しようとする課題】しかし、触媒上流に還
元剤を供給する場合、つぎの問題がある。 触媒上流に還元剤を供給する場合、触媒に近い所で
還元剤供給インジェクタを噴くと、ＨＣが燃焼せず触媒
温度が上がらず触媒を活性化できない。排気ポート近傍
で還元剤供給インジェクタを噴くと、ＨＣの一部が燃焼
し、排気温度、触媒温度を上げることができるが、ＨＣ
の通路表面への付着が多くなり、燃費の悪化を招く。と
くに、ターボ過給機付きエンジンの場合、排気ポートと
触媒との間にターボチャージャ、通路長の長い排気管が
存在し、供給還元剤の一部がそれらに付着してしまい、
予め付着分を考慮した量の還元剤を供給する必要が生
じ、燃費の悪化を招く。 還元剤供給インジェクタを設置する気筒以外から排
気ガスをＥＧＲクーラに導入しても、ターボチャージャ
上流から取り出す場合、排気マニホールド内が分離され
ていないため、排気の逆流によって還元剤がＥＧＲクー
ラに回り込み、ＨＣ被毒（ＥＧＲクーラの付着ＨＣによ
る詰まり）と、触媒に流れるＨＣ量の低下の問題が生じ
る。本発明の目的は、排気ポートで還元剤を噴くにかか
わらず、噴いた還元剤の排気通路への付着の少ない、内
燃機関（ディーゼルエンジンでもガソリンエンジンでも
可、また、ターボ過給機付きエンジン、ターボ過給機を
具備しないエンジンでも可）の排気浄化装置を提供する
ことにある。本発明のもう一つの目的は、上記の目的に
加えて、ＥＧＲクーラ側への還元剤の回り込みを少なく
できる、内燃機関の排気浄化装置を提供することにあ
る。However, when the reducing agent is supplied upstream of the catalyst, there are the following problems. When the reducing agent is supplied upstream of the catalyst, if the reducing agent supply injector is injected near the catalyst, the HC does not burn, the catalyst temperature does not rise, and the catalyst cannot be activated. When the reducing agent supply injector is injected near the exhaust port, a part of the HC is burned, and the exhaust temperature and the catalyst temperature can be increased.
Is more attached to the passage surface, which leads to deterioration of fuel efficiency. In particular, in the case of a turbocharged engine, a turbocharger and an exhaust pipe having a long passage exist between the exhaust port and the catalyst, and a part of the supply reducing agent adheres to them.
It becomes necessary to supply a reducing agent in an amount in consideration of the amount of adhesion in advance, which leads to deterioration of fuel efficiency. Even if exhaust gas is introduced into the EGR cooler from a cylinder other than the cylinder in which the reducing agent supply injector is installed, when the exhaust gas is taken out from the upstream of the turbocharger, the exhaust gas is not separated from the exhaust manifold. HC poisoning (clogging of the EGR cooler with the adhering HC) and a reduction in the amount of HC flowing through the catalyst occur. SUMMARY OF THE INVENTION An object of the present invention is to provide an internal combustion engine (either a diesel engine or a gasoline engine, or an engine with a turbocharger, (An engine without a turbocharger is also possible.) Another object of the present invention is to provide an exhaust gas purifying apparatus for an internal combustion engine, which can reduce the amount of the reducing agent flowing to the EGR cooler side in addition to the above objects.

【０００４】[0004]

【課題を解決するための手段】上記目的を達成する本発
明はつぎの通りである。 （１） リーンでＮＯｘを吸蔵し吸蔵ＮＯｘをリッチで
放出し還元するＮＯｘ浄化手段を排気系に備え、気筒の
排気ポートにまたは気筒に直接、前記リッチを作成する
ための還元剤供給用のインジェクタを設置した還元剤イ
ンジェクタ設置気筒を複数気筒の一部に有する多気筒内
燃機関の排気浄化装置であって、還元剤インジェクタ設
置気筒の排気ポートに連なる排気管を他の気筒の排気マ
ニホールドから独立させ、該還元剤インジェクタ設置気
筒の排気管を他の気筒の排気マニホールドに連なる排気
管と前記ＮＯｘ浄化手段の上流で合流させた内燃機関の
排気浄化装置。 （２） 前記内燃機関がターボ過給機付内燃機関からな
り、前記還元剤インジェクタ設置気筒の排気管はターボ
をバイパスし前記ＮＯｘ浄化手段の上流で前記他の気筒
の排気管に合流している（１）記載の内燃機関の排気浄
化装置。 （３） ＥＧＲ経路を有し、ＥＧＲ経路への排気ガスの
取り入れ口を、前記他の気筒と連通する排気経路部分に
設けた（１）または（２）記載の内燃機関の排気浄化装
置。 （４） 前記還元剤インジェクタ設置気筒のみ、前記他
の気筒と背圧が異なることによるトルク段差抑制のため
の、筒内燃料噴射用インジェクタの噴射量・噴射時期の
補正が行われる（１）または（２）記載の内燃機関の排
気浄化装置。 （５） 前記還元剤インジェクタ設置気筒の排気管に排
気絞り弁を設け背圧制御を行う（１）または（２）記載
の内燃機関の排気浄化装置。 （６） 前記還元剤インジェクタ設置気筒の排気管に排
気絞り弁を設けるとともに前記排気絞り弁の上流側に第
１の排気圧力センサを設け、前記他の気筒の排気管のタ
ーボ過給機のタービンの上流側に第２の排気圧力センサ
を設け、第１の排気圧力センサと第２の排気圧力センサ
の出力差がゼロとなるように前記排気絞り弁を制御する
（２）記載の内燃機関の排気浄化装置。 （７） 前記還元剤インジェクタ設置気筒の排気ポート
と該排気ポートにつながる排気管に隔壁を設けて２つの
通路部分とし、該２つの通路部分のうち一方の通路部分
に前記還元剤供給用インジェクタを設け、他方の通路部
分にＥＧＲ経路へのＥＧＲガス取り入れ口を設けた
（１）または（２）記載の内燃機関の排気浄化装置。 （８） 前記他方の通路部分の、前記ＥＧＲガス取り入
れ口の下流側に、排気絞り弁を設け、ＥＧＲのＯＮ領域
では前記排気絞り弁を閉とし、ＥＧＲのＯＦＦ領域では
前記排気絞り弁を開とする（７）記載の内燃機関の排気
浄化装置。The present invention to achieve the above object is as follows. (1) An exhaust system is provided with NOx purifying means for storing NOx lean and releasing and reducing the stored NOx in a rich manner, and an injector for supplying a reducing agent for creating the rich in an exhaust port of the cylinder or directly to the cylinder. An exhaust purification device for a multi-cylinder internal combustion engine having a reducing agent injector-equipped cylinder in a part of a plurality of cylinders, wherein an exhaust pipe connected to an exhaust port of the reducing agent injector-equipped cylinder is made independent of an exhaust manifold of another cylinder. An exhaust purification device for an internal combustion engine, wherein an exhaust pipe of a cylinder in which the reducing agent injector is installed is joined to an exhaust pipe connected to an exhaust manifold of another cylinder upstream of the NOx purification means. (2) The internal combustion engine is an internal combustion engine with a turbocharger, and the exhaust pipe of the cylinder in which the reducing agent injector is installed bypasses the turbo and joins the exhaust pipe of the other cylinder upstream of the NOx purifying means. (1) The exhaust gas purifying apparatus for an internal combustion engine according to (1). (3) The exhaust gas purifying apparatus for an internal combustion engine according to (1) or (2), further including an EGR path, wherein an exhaust gas inlet to the EGR path is provided in an exhaust path portion communicating with the other cylinder. (4) Correction of the injection amount and injection timing of the in-cylinder fuel injector is performed only for the cylinder in which the reducing agent injector is installed, to suppress a torque step due to a difference in back pressure from the other cylinders (1) or (2) The exhaust gas purifying apparatus for an internal combustion engine according to (2). (5) The exhaust gas purification device for an internal combustion engine according to (1) or (2), wherein an exhaust throttle valve is provided in an exhaust pipe of the cylinder in which the reducing agent injector is installed to perform back pressure control. (6) An exhaust throttle valve is provided in an exhaust pipe of the cylinder in which the reducing agent injector is installed, and a first exhaust pressure sensor is provided upstream of the exhaust throttle valve, and a turbine of a turbocharger of an exhaust pipe of the other cylinder is provided. A second exhaust pressure sensor is provided upstream of the exhaust throttle valve, and the exhaust throttle valve is controlled such that an output difference between the first exhaust pressure sensor and the second exhaust pressure sensor becomes zero. Exhaust gas purification device. (7) An exhaust port of the reducing agent injector installation cylinder and an exhaust pipe connected to the exhaust port are provided with partitions to form two passage portions, and the reducing agent supply injector is provided in one of the two passage portions. The exhaust gas purification apparatus for an internal combustion engine according to (1) or (2), wherein the EGR gas intake port to the EGR path is provided in the other passage portion. (8) An exhaust throttle valve is provided in the other passage portion downstream of the EGR gas intake, and the exhaust throttle valve is closed in an EGR ON region, and the exhaust throttle valve is opened in an EGR OFF region. (7) The exhaust gas purifying apparatus for an internal combustion engine according to (7).

【０００５】上記（１）の内燃機関の排気浄化装置で
は、リーンでＮＯｘを吸蔵し吸蔵ＮＯｘをリッチで放出
し還元するＮＯｘ浄化手段を排気系に備え、気筒の排気
ポートにまたは気筒に直接、前記リッチを作成するため
の還元剤供給用のインジェクタを設置した還元剤インジ
ェクタ設置気筒を複数気筒の一部に有する多気筒内燃機
関の排気浄化装置であって、還元剤インジェクタ設置気
筒の排気ポートに連なる排気管を他の気筒の排気マニホ
ールドから独立させ、還元剤インジェクタ設置気筒の排
気管を他の気筒の排気マニホールドに連なる排気管とＮ
Ｏｘ浄化手段の上流で合流させたので、排気ポートで還
元剤を噴くにかかわらず、噴いた還元剤の排気通路への
付着の少ない内燃機関（ディーゼルエンジンでもガソリ
ンエンジンでも可、また、ターボ過給機付きエンジン、
ターボ過給機を具備しないエンジンでも可）の排気浄化
装置とすることができる。上記（２）の内燃機関の排気
浄化装置では、内燃機関がターボ過給機付内燃機関から
なり、還元剤インジェクタ設置気筒の排気管はターボを
バイパスしＮＯｘ浄化手段の上流で他の気筒の排気管に
合流しているので、ターボ過給機のタービンを含む排気
通路への付着の少ない内燃機関の排気浄化装置とするこ
とができる。上記（３）の内燃機関の排気浄化装置で
は、ＥＧＲ経路を有し、ＥＧＲ経路への排気ガスの取り
入れ口を、前記他の気筒と連通する排気経路部分に設け
たので、ＥＧＲクーラ側への還元剤の回り込みを少なく
できる。上記（４）の内燃機関の排気浄化装置では、前
記還元剤インジェクタ設置気筒のみ、前記他の気筒と背
圧が異なることによるトルク段差抑制のための、筒内燃
料噴射用インジェクタの噴射量・噴射時期の補正が行わ
れるので、還元剤インジェクタ設置気筒と他の気筒との
背圧が異なることによるトルク段差を抑制することがで
きる。上記（５）の内燃機関の排気浄化装置では、還元
剤インジェクタ設置気筒の排気管に排気絞り弁を設け背
圧制御を行うので、還元剤インジェクタ設置気筒と他の
気筒との背圧が異なることによるトルク段差を抑制する
ことができる。上記（６）の内燃機関の排気浄化装置で
は、還元剤インジェクタ設置気筒の排気管に排気絞り弁
を設けるとともに排気絞り弁の上流側に第１の排気圧力
センサを設け、前記他の気筒の排気管のターボ過給機の
タービンの上流側に第２の排気圧力センサを設け、第１
の排気圧力センサと第２の排気圧力センサの出力差がゼ
ロとなるように排気絞り弁を制御するので、還元剤イン
ジェクタ設置気筒と他の気筒との背圧が異なることによ
るトルク段差を抑制することができる。上記（７）の内
燃機関の排気浄化装置では、還元剤インジェクタ設置気
筒の排気ポートと該排気ポートにつながる排気管に隔壁
を設けて２つの通路部分とし、該２つの通路部分のうち
一方の通路部分に還元剤供給用インジェクタを設け、他
方の通路部分にＥＧＲ経路へのＥＧＲガス取り入れ口を
設けたので、ＥＧＲクーラ側への還元剤の回り込みを少
なくできる。上記（８）の内燃機関の排気浄化装置で
は、他方の通路部分の、ＥＧＲガス取り入れ口の下流側
に、排気絞り弁を設け、ＥＧＲのＯＮ領域では前記排気
絞り弁を閉とし、ＥＧＲのＯＦＦ領域では前記排気絞り
弁を開とするので、ＥＧＲのＯＮ領域でＥＧＲ量を確保
でき、ＥＧＲのＯＦＦ領域でＥＧＲ系の耐圧性を確保す
ることができる。The exhaust gas purifying apparatus for an internal combustion engine of the above (1) is provided with a NOx purifying means for leanly storing NOx and releasing and reducing the stored NOx in a rich manner in an exhaust system, and is provided directly to an exhaust port of a cylinder or directly to a cylinder. An exhaust purification device for a multi-cylinder internal combustion engine having a reducing agent injector-installed cylinder provided with an injector for reducing agent supply for creating the rich in a part of a plurality of cylinders, wherein an exhaust port of the reducing agent injector-installed cylinder is provided. The exhaust pipe connected to the exhaust manifold of the other cylinder is separated from the exhaust manifold of the other cylinder, and the exhaust pipe of the cylinder on which the reducing agent injector is installed is connected to the exhaust pipe connected to the exhaust manifold of the other cylinder.
Since the merging is performed upstream of the Ox purifying means, regardless of whether the reducing agent is injected at the exhaust port, the injected reducing agent is less likely to adhere to the exhaust passage (either a diesel engine or a gasoline engine, or a turbocharged engine). Engine,
(An engine without a turbocharger may be used.) In the exhaust gas purifying apparatus for an internal combustion engine of the above (2), the internal combustion engine is an internal combustion engine with a turbocharger, and the exhaust pipe of the cylinder in which the reducing agent injector is installed bypasses the turbo and exhausts other cylinders upstream of the NOx purification means. Since it joins the pipe, it is possible to provide an exhaust gas purifying apparatus for an internal combustion engine with less adhesion to an exhaust passage including a turbine of a turbocharger. In the exhaust gas purifying apparatus for an internal combustion engine according to the above (3), the exhaust gas purifying apparatus has an EGR path, and the exhaust gas intake port to the EGR path is provided in an exhaust path portion communicating with the other cylinder. Reducing of the reducing agent can be reduced. In the exhaust gas purifying apparatus for an internal combustion engine according to the above (4), the injection amount / injection of the in-cylinder fuel injector for suppressing a torque step due to a different back pressure from the other cylinder only in the cylinder in which the reducing agent injector is provided. Since the timing is corrected, it is possible to suppress a torque step due to a difference in back pressure between the cylinder in which the reducing agent injector is installed and another cylinder. In the exhaust gas purifying apparatus for an internal combustion engine of the above (5), an exhaust throttle valve is provided in the exhaust pipe of the cylinder in which the reducing agent injector is installed, and the back pressure is controlled. Therefore, the back pressure in the cylinder in which the reducing agent injector is installed and the other cylinder are different. Torque step due to the above can be suppressed. In the exhaust gas purifying apparatus for an internal combustion engine according to the above (6), an exhaust throttle valve is provided in an exhaust pipe of a cylinder in which a reducing agent injector is installed, and a first exhaust pressure sensor is provided upstream of the exhaust throttle valve to exhaust the other cylinders. A second exhaust pressure sensor is provided on the pipe upstream of the turbine of the turbocharger,
The exhaust throttle valve is controlled so that the output difference between the exhaust pressure sensor and the second exhaust pressure sensor becomes zero, thereby suppressing a torque step due to a difference in back pressure between the cylinder in which the reducing agent injector is installed and another cylinder. be able to. In the exhaust gas purifying apparatus for an internal combustion engine according to the above (7), a partition is provided in an exhaust port of the cylinder in which the reducing agent injector is installed and an exhaust pipe connected to the exhaust port to form two passage portions, and one of the two passage portions is provided. Since the reducing agent supply injector is provided in the portion and the EGR gas intake port to the EGR path is provided in the other passage portion, the amount of the reducing agent flowing to the EGR cooler side can be reduced. In the exhaust gas purifying apparatus for an internal combustion engine according to the above (8), an exhaust throttle valve is provided on the other passage portion downstream of the EGR gas intake port, and in the EGR ON region, the exhaust throttle valve is closed, and the EGR is turned off. Since the exhaust throttle valve is opened in the region, the EGR amount can be secured in the EGR ON region, and the pressure resistance of the EGR system can be secured in the EGR OFF region.

【０００６】[0006]

【発明の実施の形態】以下に、本発明実施例の内燃機関
の排気浄化装置を、図１〜図８を参照して、説明する。
図１、図５は本発明の実施例１に係わり、図２、図６は
本発明の実施例２に係わり、図３、図７は本発明の実施
例３に係わり、図４、図８は本発明の実施例４に係わ
る。図中、本発明の全実施例にわたって共通する構成部
分には本発明の全実施例にわたって同じ符号を付してあ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An exhaust gas purifying apparatus for an internal combustion engine according to an embodiment of the present invention will be described below with reference to FIGS.
1 and 5 relate to the first embodiment of the present invention, FIGS. 2 and 6 relate to the second embodiment of the present invention, FIGS. 3 and 7 relate to the third embodiment of the present invention, and FIGS. Relates to the fourth embodiment of the present invention. In the drawings, components common to all embodiments of the present invention are denoted by the same reference numerals throughout all embodiments of the present invention.

【０００７】まず、本発明の全実施例にわたって共通す
る部分の構成、作用を、図１を参照して説明する。本発
明実施例の内燃機関の排気浄化装置は、図１に示すよう
に、リーン（酸素過剰排気条件）でＮＯｘを吸蔵し吸蔵
ＮＯｘをリッチ（空燃比が理論空燃比からそれよりリッ
チに対応する排気条件）で放出し還元するＮＯｘ浄化手
段１１を排気系に備え、気筒１３の排気ポート１４にま
たは気筒１３に直接、前記リッチを作成するための還元
剤（たとえば、炭化水素、以下、ＨＣともいう）供給用
のインジェクタ１７を設置した還元剤インジェクタ設置
気筒１３ａを複数気筒の一部に有する多気筒内燃機関１
０の排気浄化装置であって、還元剤インジェクタ設置気
筒１３ａの排気ポート１４ａに連なる排気管１６ａを他
の気筒１３ｂの排気マニホールド１５ｂから独立させ、
還元剤インジェクタ設置気筒１３ａの排気管１６ａを他
の気筒１３ｂの排気マニホールド１５ｂに連なる排気管
１６ｂとＮＯｘ浄化手段１１の上流で合流させた内燃機
関の排気浄化装置からなる。３１は合流点を示す。還元
剤インジェクタ設置気筒１３ａの排気ポート１４ａは他
の気筒１３ｂの排気ポート１４ｂから当然に独立してい
る。なお、２１はマフラーを示す。First, the configuration and operation of a portion common to all embodiments of the present invention will be described with reference to FIG. As shown in FIG. 1, the exhaust gas purifying apparatus for an internal combustion engine according to the embodiment of the present invention stores NOx in a lean state (excessive oxygen exhaust conditions) and enriches the stored NOx (the air-fuel ratio corresponds to the stoichiometric air-fuel ratio more than the stoichiometric air-fuel ratio). The exhaust system is provided with a NOx purifying means 11 for releasing and reducing under exhaust conditions, and a reducing agent (for example, hydrocarbon, hereinafter referred to as HC) for making the rich is provided to the exhaust port 14 of the cylinder 13 or directly to the cylinder 13. Multi-cylinder internal combustion engine 1 having a reducing agent injector installation cylinder 13a in which a supply injector 17 is installed in a part of a plurality of cylinders.
0, wherein the exhaust pipe 16a connected to the exhaust port 14a of the reducing agent injector installation cylinder 13a is made independent of the exhaust manifold 15b of the other cylinder 13b,
An exhaust gas purification device for an internal combustion engine is formed by joining an exhaust pipe 16a of a reducing agent injector installation cylinder 13a with an exhaust pipe 16b connected to an exhaust manifold 15b of another cylinder 13b upstream of the NOx purification means 11. 31 indicates a junction. The exhaust port 14a of the reducing agent injector installation cylinder 13a is naturally independent of the exhaust port 14b of the other cylinder 13b. Incidentally, 21 indicates a muffler.

【０００８】ここで、内燃機関１０は、ディーゼルエン
ジンでもガソリンエンジンでもよく、また、ターボ過給
機付きエンジンでも、ターボ過給機を具備しないエンジ
ンでもよい。図示例は、内燃機関１０が、ターボ過給機
付きディーゼルエンジンの場合を示す。内燃機関１０
が、ターボ過給機付きディーゼルエンジンの場合、２０
はターボ過給機１９のコンプレッサ、２２はＥＧＲ経
路、２３はＥＧＲクーラ、２４はＥＧＲバルブ、２５は
吸気マニホールド、２６は吸気絞りである。２７は、Ｅ
ＣＵ（電子制御装置）を示す。また、２８はエアフロー
メータ、２９はエアクリーナ、３０は筒内噴射用インジ
ェクタである。Here, the internal combustion engine 10 may be a diesel engine or a gasoline engine, or may be an engine with a turbocharger or an engine without a turbocharger. The illustrated example shows a case where the internal combustion engine 10 is a diesel engine with a turbocharger. Internal combustion engine 10
Is 20 for a turbocharged diesel engine.
, A compressor of the turbocharger 19; 22, an EGR path; 23, an EGR cooler; 24, an EGR valve; 25, an intake manifold; 27 is E
1 shows a CU (electronic control unit). 28 is an air flow meter, 29 is an air cleaner, and 30 is an in-cylinder injector.

【０００９】ＮＯｘ浄化手段１１は、 酸素過剰排気（リーン）で、ＮＯｘとの化学的反応
またはＮＯｘのイオン拡散反応を伴って、ＮＯｘを吸蔵
（吸収）し、排気条件が還元方向（リッチ）に変化する
とそれまで吸蔵したＮＯｘを放出することができる、元
素（たとえば、Ｂａ、Ｌａ等）またはその化合物（炭酸
化物、酸化物など）または前記元素と前記化合物との混
合物からなるＮＯｘ吸収材と、 酸化または還元反応が行われる際の触媒（たとえ
ば、Ｐｔ、この触媒は吸蔵ＮＯｘが放出された時にそれ
を還元する作用ももつ）と、を含むＮＯｘ吸蔵・放出型
のＮＯｘ浄化手段１１からなる。ＮＯｘ浄化手段１１の
下流に、さらに三元触媒または酸化触媒１２が設けられ
てもよい。リッチ排気条件を作るのに、内燃機関１０が
ディーゼルエンジンの場合は、還元剤（たとえば、Ｈ
Ｃ）供給用のインジェクタ１７は、還元剤を排気ポート
１４に噴射する。筒内に噴くとトルクとなってしまうか
らである。内燃機関１０がガソリンエンジンの場合は、
筒内燃料噴射でリッチスパイクを入れてもよい。The NOx purifying means 11 absorbs (absorbs) NOx with a chemical reaction with NOx or an ion diffusion reaction of NOx by means of excess oxygen exhaust (lean), and the exhaust condition is reduced (rich). A NOx absorbent composed of an element (for example, Ba, La, or the like) or a compound thereof (carbon oxide, oxide, or the like) or a mixture of the element and the compound, which can release the NOx occluded up to then; A catalyst (for example, Pt, this catalyst also has a function of reducing stored NOx when it is released) when the oxidation or reduction reaction is carried out, and a NOx storage / release type NOx purifying means 11 including. A three-way catalyst or an oxidation catalyst 12 may be further provided downstream of the NOx purification means 11. If the internal combustion engine 10 is a diesel engine to create rich exhaust conditions, a reducing agent (eg, H
C) The supply injector 17 injects the reducing agent into the exhaust port 14. This is because when injected into the cylinder, torque is generated. When the internal combustion engine 10 is a gasoline engine,
A rich spike may be inserted by in-cylinder fuel injection.

【００１０】つぎに、上記本発明の全実施例に共通する
部分の作用を説明する。還元剤供給インジェクタ１７か
らは、機関始動時や低機関水温時に、排気浄化手段１１
を活性化させる、あるいは活性状態に維持するために、
還元剤が噴射される。その他の時は、還元剤供給インジ
ェクタ１７からの還元剤の噴射は停止してもよい。還元
剤インジェクタ設置気筒１３ａの排気マニホールドを他
の気筒１３ｂの排気マニホールド１５ｂから独立させて
排気ポート１４ａにつらなる排気管１６ａとし、還元剤
インジェクタ設置気筒１３ａの排気管１６ａを他の気筒
１３ｂの排気マニホールド１５ｂに連なる排気管１６ｂ
とＮＯｘ浄化手段１１の上流で合流させたので、還元剤
インジェクタ設置気筒１３ａの排気通路表面積を小にで
き、排気ポート１４ａで還元剤を噴くにかかわらず、噴
いた還元剤の排気通路（排気管１６ａ）への付着の少な
い、還元剤を効率よくＮＯｘ浄化手段１１に供給でき
る、内燃機関の排気浄化装置とすることができる。ま
た、排気ポート１４ａで還元剤を噴くため、噴かれた還
元剤の一部が排気ポート１４ａの高温で燃焼し、排気ガ
ス温度を上げ、ＮＯｘ浄化手段１１の温度を上げて活性
化温度に維持でき、あるいは始動時等の場合は速やかに
ＮＯｘ浄化手段１１の温度を上げて活性化温度にするこ
とができる。Next, the operation of the parts common to all the embodiments of the present invention will be described. From the reducing agent supply injector 17, the exhaust gas purifying means 11
To activate or maintain the active state,
A reducing agent is injected. At other times, the injection of the reducing agent from the reducing agent supply injector 17 may be stopped. The exhaust manifold of the reducing agent injector-installed cylinder 13a is made independent of the exhaust manifold 15b of the other cylinder 13b as an exhaust pipe 16a connected to the exhaust port 14a, and the exhaust pipe 16a of the reducing agent injector-installed cylinder 13a is exhaust manifold of the other cylinder 13b. Exhaust pipe 16b connected to 15b
And the upstream of the NOx purifying means 11, the surface area of the exhaust passage of the reducing agent injector installation cylinder 13 a can be reduced, and the exhaust passage of the ejected reducing agent (exhaust pipe regardless of whether the reducing agent is ejected at the exhaust port 14 a). An exhaust gas purification device for an internal combustion engine that can efficiently supply a reducing agent to the NOx purification means 11 with less adhesion to 16a) can be provided. Further, since the reducing agent is injected at the exhaust port 14a, a part of the injected reducing agent burns at a high temperature of the exhaust port 14a, raises the exhaust gas temperature, and raises the temperature of the NOx purification means 11 to maintain the activation temperature. Alternatively, at the time of starting or the like, the temperature of the NOx purifying means 11 can be quickly raised to the activation temperature.

【００１１】つぎに、本発明の各実施例に特有な構成、
作用を説明する。本発明の実施例１では、図１、図５に
示すように、内燃機関１０がターボ過給機１８付内燃機
関からなり、還元剤インジェクタ設置気筒１３ａの排気
管１６ａはターボ過給機１８のタービン１９をバイパス
し、ＮＯｘ浄化手段１１の上流で、他の気筒１３ｂの排
気管１６ｂに合流している。他の気筒１３ｂの排気管１
６ｂを流れる排気ガスはターボ過給機１８のタービン１
９を通る。３１は合流点を示す。Next, a configuration specific to each embodiment of the present invention,
The operation will be described. In the first embodiment of the present invention, as shown in FIGS. 1 and 5, the internal combustion engine 10 includes an internal combustion engine with a turbocharger 18, and the exhaust pipe 16 a of the cylinder 13 a with a reducing agent injector is connected to the turbocharger 18. It bypasses the turbine 19 and joins the exhaust pipe 16b of the other cylinder 13b upstream of the NOx purifying means 11. Exhaust pipe 1 of other cylinder 13b
The exhaust gas flowing through the turbine 6b is the turbine 1 of the turbocharger 18.
Go through 9. 31 indicates a junction.

【００１２】また、本発明の実施例１の内燃機関１０の
排気浄化装置は、ＥＧＲ経路２２を有し、ＥＧＲ経路２
２には、ＥＧＲガス流れ方向に順にＥＧＲクーラ２３、
ＥＧＲバルブ２４が設けられている。ＥＧＲ経路２２へ
の排気ガスの取り入れ口３２は、前記他の気筒１３ｂと
連通する排気経路部分（排気マニホールド１５ｂ、排気
管１６ｂ）でタービン１９より上流側の部分に設けられ
ている。ＥＧＲ経路２２の排気ガス出口３３は吸気マニ
ホールド２５に設けられている。吸気マニホールド２５
は還元剤インジェクタ設置気筒１３ａとその他の気筒１
３ｂに対して単一の共通の吸気マニホールドからなる。Further, an exhaust gas purifying apparatus for an internal combustion engine 10 according to a first embodiment of the present invention has an EGR path 22 and an EGR path 22.
2, the EGR cooler 23 in order in the EGR gas flow direction,
An EGR valve 24 is provided. The exhaust gas intake port 32 to the EGR path 22 is provided in a part of the exhaust path (the exhaust manifold 15b and the exhaust pipe 16b) communicating with the other cylinder 13b, at a part upstream of the turbine 19. An exhaust gas outlet 33 of the EGR path 22 is provided in the intake manifold 25. Intake manifold 25
Is the reducing agent injector installation cylinder 13a and the other cylinders 1
3b consists of a single common intake manifold.

【００１３】還元剤インジェクタ設置気筒１３ａのみ、
他の気筒１３ｂと背圧が異なることによるトルク段差抑
制のための、筒内燃料噴射用インジェクタ３０の噴射量
・噴射時期の補正が行われる。図５は、その筒内燃料噴
射用インジェクタ３０の噴射量、噴射時期を決定する補
正ルーチンを示す。図５の補正ルーチンは、ＥＣＵ２７
にインストールされており、所定時間間隔毎に割り込ま
れ、演算が実行される。ステップ１０１で燃料噴射順序
が該当気筒（還元剤インジェクタ設置気筒）１３ａか否
かが判定され、燃料噴射順序が該当気筒である場合はス
テップ１０２に進んで補正された噴射量と噴射時期で筒
内燃料噴射を実行し、燃料噴射順序が該当気筒でない場
合はステップ１０３に進んで通常の噴射量と噴射時期で
筒内燃料噴射を実行する。 Ｑa ：図５のエンジン回転数と負荷とによって求まる燃
料噴射量 Ｔa ：図５のエンジン回転数と負荷とによって求まる燃
料噴射時期 Ｑb ：図５のエンジン回転数と負荷とによって求まる補
正燃料噴射量 Ｔb ：図５のエンジン回転数と負荷とによって求まる補
正燃料噴射時期 とすると、燃料噴射量Ａ、燃料噴射時期Ｂは、ステップ
１０２では、 Ａ←Ｑa −Ｑb Ｂ←Ｔa −Ｔb とおかれて、ターボ過給機をバイパスしているため他の
気筒１３ｂと背圧が異なることによるトルク分、気筒１
３ａの燃料噴射量を調整し、燃料噴射時期を調整する。
ステップ１０３では、 Ａ←Ｑa Ｂ←Ｔa とおかれて、通常の燃料噴射量、燃料噴射時期で燃料噴
射が実行される。[0013] Only the reducing agent injector installation cylinder 13a,
The correction of the injection amount and the injection timing of the in-cylinder fuel injector 30 is performed to suppress the torque difference due to the difference in the back pressure from the other cylinders 13b. FIG. 5 shows a correction routine for determining the injection amount and the injection timing of the in-cylinder fuel injector 30. The correction routine of FIG.
And is interrupted at predetermined time intervals to execute the calculation. In step 101, it is determined whether or not the fuel injection order is the corresponding cylinder (cylinder in which the reducing agent injector is installed) 13a. If the fuel injection order is the corresponding cylinder, the routine proceeds to step 102, where the corrected injection amount and injection timing are used to determine the in-cylinder The fuel injection is executed, and if the fuel injection order is not the corresponding cylinder, the routine proceeds to step 103, where the in-cylinder fuel injection is executed with a normal injection amount and injection timing. Q a: fuel injection quantity determined by the engine speed of FIG. 5 and the load and T a: determined by the engine speed of FIG. 5 and the load and the fuel injection timing Q b: corrected fuel which is obtained by the engine speed of FIG. 5 and the load and injection amount T b: the corrected fuel injection timing to the obtained by the engine speed of FIG. 5 and the load and the fuel injection amount a, the fuel injection timing B, in step 102, a ← Q a -Q b B ← T a - It is placed and T b, the torque caused by the other cylinders 13b and the back pressure is different because it bypasses the turbocharger, the cylinder 1
The fuel injection amount of 3a is adjusted, and the fuel injection timing is adjusted.
In step 103, it is placed as A ← Q a B ← T a , the amount normal fuel injection, fuel injection is executed at the fuel injection timing.

【００１４】本発明の実施例１の作用は、つぎの通りで
ある。本発明の実施例１の内燃機関の排気浄化装置で
は、内燃機関１０がターボ過給機付内燃機関からなり、
還元剤インジェクタ設置気筒１３ａの排気管１６ａはタ
ーボ過給機１８のタービン１９をバイパスしＮＯｘ浄化
手段１１の上流（合流点３１）で他の気筒１３ｂの排気
管１６ｂに合流しているので、噴射された還元剤の、タ
ーボ過給機１８のタービン１９を含む排気通路への付着
の少ない内燃機関の排気浄化装置とすることができる。The operation of the first embodiment of the present invention is as follows. In the exhaust gas purifying apparatus for an internal combustion engine according to the first embodiment of the present invention, the internal combustion engine 10 is an internal combustion engine with a turbocharger,
Since the exhaust pipe 16a of the reducing agent injector installation cylinder 13a bypasses the turbine 19 of the turbocharger 18 and joins the exhaust pipe 16b of the other cylinder 13b upstream of the NOx purifying means 11 (the junction 31), injection is performed. An exhaust gas purification device for an internal combustion engine can be obtained in which the reduced agent that adheres to the exhaust passage including the turbine 19 of the turbocharger 18 is small.

【００１５】本発明の実施例１の内燃機関の排気浄化装
置では、ＥＧＲ経路２２を有し、ＥＧＲ経路２２への排
気ガスの取り入れ口３２を、他の気筒１３ｂと連通する
排気経路部分（図示例では排気マニホールド１５ｂ）に
設けたので、ＥＧＲクーラ２３側への還元剤の回り込み
を少なくできる。ＥＧＲクーラ２３の詰まり防止とな
る。The exhaust gas purifying apparatus for an internal combustion engine according to the first embodiment of the present invention has an EGR path 22, and an exhaust path portion (see FIG. 1) for connecting an exhaust gas inlet 32 to the EGR path 22 with another cylinder 13b. In the illustrated example, since the exhaust gas is provided in the exhaust manifold 15b), the amount of the reducing agent flowing to the EGR cooler 23 side can be reduced. The clogging of the EGR cooler 23 is prevented.

【００１６】本発明の実施例１の内燃機関の排気浄化装
置では、還元剤インジェクタ設置気筒１３ａのみ、他の
気筒１３ｂと背圧が異なることによるトルク段差抑制の
ための、筒内燃料噴射用インジェクタ３０の燃料噴射量
・噴射時期の補正（図５の制御ルーチンによる補正）が
行われるので、還元剤インジェクタ設置気筒１３ａと他
の気筒１３ｂとの背圧が異なることによるトルク段差を
抑制することができる。すなわち、タービンがあるため
に他の気筒１３ｂの背圧は還元剤インジェクタ設置気筒
１３ａの背圧より高く、還元剤インジェクタ設置気筒１
３ａは他の気筒１３ｂに比べてトルクが出るが、その
分、還元剤インジェクタ設置気筒１３ａの燃料噴射量・
噴射時期を補正して（ＥＣＵ２７による、還元剤インジ
ェクタ設置気筒１３ａの判別と、燃料噴射量・噴射時期
の補正制御）で還元剤インジェクタ設置気筒１３ａのト
ルクを下げ、他の気筒１３ｂのトルクに合わせるように
することができる。In the exhaust gas purifying apparatus for an internal combustion engine according to the first embodiment of the present invention, an in-cylinder fuel injector for suppressing a torque step due to a difference in back pressure between only the cylinder 13a provided with a reducing agent injector and the other cylinders 13b. Since the correction of the fuel injection amount / injection timing of 30 (correction by the control routine in FIG. 5) is performed, it is possible to suppress the torque step due to the difference in the back pressure between the cylinder 13a in which the reducing agent injector is installed and the other cylinder 13b. it can. That is, because of the presence of the turbine, the back pressure of the other cylinder 13b is higher than the back pressure of the reducing agent injector-installed cylinder 13a, and the reducing agent injector-installed cylinder 1
3a has a higher torque than the other cylinders 13b, but the fuel injection amount of the reducing agent injector installation cylinder 13a
The injection timing is corrected (the ECU 27 determines the reducing agent injector-installed cylinder 13a and corrects the fuel injection amount / injection timing) to reduce the torque of the reducing agent injector-installed cylinder 13a to match the torque of the other cylinders 13b. You can do so.

【００１７】本発明の実施例２は、図２、図６に示すよ
うに、本発明の実施例２が排気絞り弁を設けた点のみで
本発明の実施例１と異なり、他の部分は本発明の実施例
１と同じである。図２では、実施例１と異なる部分とそ
の近傍のみを示している。図１には示されているが図２
には図示を省略されている部分は、図１に準じる。本発
明の実施例２では、図１に示した本発明の実施例１と同
様に、内燃機関１０がターボ過給機１８付内燃機関から
なり、還元剤インジェクタ設置気筒１３ａの排気管１６
ａはターボ過給機１８のタービン１９をバイパスし、Ｎ
Ｏｘ浄化手段１１の上流で、他の気筒１３ｂの排気管１
６ｂに合流している。他の気筒１３ｂの排気管１６ｂを
流れる排気ガスはターボ過給機１８のタービン１９を通
る。３１は合流点を示す。本発明の実施例２では、図２
に示すように、還元剤インジェクタ設置気筒１３ａの排
気管１６ａに排気絞り弁３４を設け、背圧制御が行われ
る。この制御は、還元剤インジェクタ設置気筒１３ａの
排気管１６ａがターボ過給機１８のタービン１９をバイ
パスしているために、他の気筒１３ｂと背圧が異なるこ
とによるトルク段差を抑制するための制御である。The second embodiment of the present invention differs from the first embodiment only in that an exhaust throttle valve is provided in the second embodiment of the present invention, as shown in FIGS. This is the same as Embodiment 1 of the present invention. FIG. 2 shows only a portion different from the first embodiment and its vicinity. Although shown in FIG. 1, FIG.
The parts not shown in FIG. In the second embodiment of the present invention, similarly to the first embodiment of the present invention shown in FIG. 1, the internal combustion engine 10 includes an internal combustion engine with a turbocharger 18, and the exhaust pipe 16 of the reducing agent injector installation cylinder 13a.
a bypasses the turbine 19 of the turbocharger 18 and
The exhaust pipe 1 of another cylinder 13b is provided upstream of the Ox purifying means 11.
6b. The exhaust gas flowing through the exhaust pipe 16b of the other cylinder 13b passes through the turbine 19 of the turbocharger 18. 31 indicates a junction. In Embodiment 2 of the present invention, FIG.
As shown in the figure, an exhaust throttle valve 34 is provided in the exhaust pipe 16a of the reducing agent injector installation cylinder 13a, and back pressure control is performed. This control is performed to suppress a torque step due to a different back pressure from the other cylinders 13b because the exhaust pipe 16a of the reducing agent injector installation cylinder 13a bypasses the turbine 19 of the turbocharger 18. It is.

【００１８】図６は、この制御のための制御ルーチンを
示している。該制御ルーチンは、ＥＣＵ２７にインスト
ールされており、所定時間毎に割り込まれて演算が実行
される。ステップ２０１において、還元剤供給条件が成
立しているか否かが判定され、成立しているならステッ
プ２０２に進んで絞り弁３４を開とし、成立していない
ならステップ２０３に進んで絞り弁３４を閉（閉は完全
閉ではなく、排気ガスが絞り弁３４を通過して流れる中
開）とする。もう一つのルーチンで、ステップ２１０に
て、気筒順序が該当気筒（還元剤インジェクタ設置気筒
１３ａ）か否かを判定し、該当気筒ならステップ２１１
に進み排気絞り弁３４が開か否かを判定し、開ならステ
ップ２１２に進んで、 Ａ←Ｑa −Ｑb Ｂ←Ｔa −Ｔb とおいて、ターボ過給機をバイパスしているため他の気
筒１３ｂと背圧が異なることによるトルク分、気筒１３
ａの燃料噴射量を調整し、燃料噴射時期を調整してトル
クを合わすようにする。ステップ２１０で該当気筒でな
いと判定されたか、または、ステップ２１１で排気絞り
弁が閉と判定されたなら、ステップ２１３に進み、 Ａ←Ｑa Ｂ←Ｔa とおいて、通常の燃料噴射量、燃料噴射時期で燃料噴射
を実行する。ここで、Ｑ a 、Ｔa 、Ｑb 、Ｔb は、本発
明の実施例１で説明したものに準じる。通常の噴射量で
燃料噴射を行っても、絞り弁３４が閉（中開）のため、
気筒１３ａの背圧は気筒１３ｂの背圧と同じとなり、気
筒１３ａと気筒１３ｂとの間で、背圧が異なることによ
るトルク段差は生じない。FIG. 6 shows a control routine for this control.
Is shown. The control routine is installed in the ECU 27.
Is interrupted at predetermined time intervals and the calculation is executed.
Is done. In step 201, the reducing agent supply condition is satisfied.
It is determined whether it is standing or not.
Proceed to step 202 to open the throttle valve 34, not established
If so, proceed to step 203 and close the throttle valve 34 (closed completely
Exhaust gas flows through throttle valve 34 instead of closing
Open). In another routine, go to step 210
The cylinder order corresponds to the cylinder (the cylinder where the reducing agent injector is installed)
13a), and if it is the corresponding cylinder, step 211
To determine whether the exhaust throttle valve 34 is open.
Go to step 212, A ← Qa−Qb B ← Ta-Tb However, since the turbocharger is bypassed,
The amount of torque due to the difference in back pressure from cylinder 13b
a) adjust the fuel injection amount, adjust the fuel injection timing
Make sure they match. In step 210,
Or the exhaust throttle in step 211
If it is determined that the valve is closed, the process proceeds to step 213, where A ← Qa B ← Ta In the meantime, fuel injection at normal fuel injection amount and fuel injection timing
Execute Where Q a, Ta, Qb, TbIs the original
This is similar to that described in the first embodiment. With normal injection amount
Even when fuel injection is performed, the throttle valve 34 is closed (medium open).
The back pressure of the cylinder 13a becomes the same as the back pressure of the cylinder 13b,
The back pressure differs between the cylinder 13a and the cylinder 13b.
No torque step occurs.

【００１９】本発明の実施例２の作用は、つぎの通りで
ある。還元剤インジェクタ設置気筒の排気管に排気絞り
弁を設け背圧制御を行うので、還元剤インジェクタ設置
気筒と他の気筒との背圧が異なることによるトルク段差
を抑制することができる。The operation of the second embodiment of the present invention is as follows. Since an exhaust throttle valve is provided in the exhaust pipe of the cylinder in which the reducing agent injector is installed, and the back pressure is controlled, a torque difference due to a difference in the back pressure between the cylinder in which the reducing agent injector is installed and another cylinder can be suppressed.

【００２０】本発明の実施例３は、図３、図７に示すよ
うに、本発明の実施例３が、第１、第２の排気圧力セン
サを設けて、気筒１３ａの背圧と気筒１３ｂの背圧とを
より一層同じに制御して、還元剤インジェクタ設置気筒
１３ａと他の気筒１３ｂとの背圧が異なることによるト
ルク段差を抑制するようにした点において、本発明の実
施例２と異なり、他の部分は本発明の実施例２と同じで
ある。図３では、実施例１、図２と異なる部分とその近
傍のみを示している。図１、図２には示されているが図
３には図示を省略されている部分は、図１、図２に準じ
る。In the third embodiment of the present invention, as shown in FIGS. 3 and 7, the third embodiment of the present invention is provided with first and second exhaust pressure sensors so that the back pressure of the cylinder 13a and the cylinder 13b The second embodiment is different from the second embodiment of the present invention in that the back pressure of the cylinder 13a and the other cylinder 13b is controlled by controlling the back pressure of the cylinder 13a and the other cylinder 13b differently. Otherwise, the other parts are the same as the second embodiment of the present invention. FIG. 3 shows only a portion different from the first and second embodiments and its vicinity. Portions shown in FIGS. 1 and 2 but not shown in FIG. 3 correspond to FIGS. 1 and 2.

【００２１】本発明の実施例３では、図１、図２にそれ
ぞれ示した本発明の実施例１、実施例２と同様に、内燃
機関１０がターボ過給機１８付内燃機関からなり、還元
剤インジェクタ設置気筒１３ａの排気管１６ａはターボ
過給機１８のタービン１９をバイパスし、ＮＯｘ浄化手
段１１の上流で、他の気筒１３ｂの排気管１６ｂに合流
している。他の気筒１３ｂの排気管１６ｂを流れる排気
ガスはターボ過給機１８のタービン１９を通る。３１は
合流点を示す。本発明の実施例３では、図２に示した本
発明の実施例２と同様に、還元剤インジェクタ設置気筒
１３ａの排気管１６ａに排気絞り弁３４を設け、背圧制
御が行われる。この制御は、還元剤インジェクタ設置気
筒１３ａの排気管１６ａがターボ過給機１８のタービン
１９をバイパスしているために、他の気筒１３ｂと背圧
が異なることによるトルク段差を抑制するための制御で
ある。この制御は、図６に示す本発明の実施例２の制御
ルーチン（図６のステップ２０１〜２０３、およびステ
ップ２１０〜２１３、その制御は本発明の実施例２で説
明したものに準じる）によって行われる。In the third embodiment of the present invention, as in the first and second embodiments of the present invention shown in FIGS. 1 and 2, the internal combustion engine 10 comprises an internal combustion engine with a turbocharger 18, The exhaust pipe 16a of the agent injector installation cylinder 13a bypasses the turbine 19 of the turbocharger 18 and joins the exhaust pipe 16b of the other cylinder 13b upstream of the NOx purification means 11. The exhaust gas flowing through the exhaust pipe 16b of the other cylinder 13b passes through the turbine 19 of the turbocharger 18. 31 indicates a junction. In the third embodiment of the present invention, similarly to the second embodiment of the present invention shown in FIG. 2, an exhaust throttle valve 34 is provided in the exhaust pipe 16a of the reducing agent injector installation cylinder 13a to perform back pressure control. This control is performed to suppress a torque step due to a different back pressure from the other cylinders 13b because the exhaust pipe 16a of the reducing agent injector installation cylinder 13a bypasses the turbine 19 of the turbocharger 18. It is. This control is performed by the control routine of the second embodiment of the present invention shown in FIG. 6 (steps 201 to 203 and steps 210 to 213 in FIG. 6, the control is similar to that described in the second embodiment of the present invention). Will be

【００２２】本発明の実施例３の内燃機関の排気浄化装
置では、図３、図７に示すように、図２の実施例２の装
置に、還元剤インジェクタ設置気筒１３ａの絞り弁３４
の上流に第１の排気圧力センサ３５が設けられており、
他の気筒１３ｂの排気系のタービン１９より上流に第２
の排気圧力センサ３６が設けられている。ＥＣＵ２７
は、第１の排気圧力センサ３５と第２の排気圧力センサ
３６の出力差がゼロとなるように排気絞り弁３４を制御
する。In the exhaust gas purifying apparatus for an internal combustion engine according to the third embodiment of the present invention, as shown in FIGS. 3 and 7, the throttle valve 34 of the cylinder 13a provided with the reducing agent injector is added to the apparatus of the second embodiment shown in FIG.
A first exhaust pressure sensor 35 is provided upstream of
The second upstream of the turbine 19 of the exhaust system of the other cylinder 13b
Exhaust pressure sensor 36 is provided. ECU27
Controls the exhaust throttle valve 34 so that the output difference between the first exhaust pressure sensor 35 and the second exhaust pressure sensor 36 becomes zero.

【００２３】本発明の実施例３では、さらに、図７に示
す排気絞り弁３４の開度補正（閉、すなわち中開の開度
補正）が行われる。図７の制御ルーチンには所定時間間
隔毎に割り込まれる。該補正は、図７において、ステッ
プ３０１で第１の排気圧力センサ３５で検出された排気
圧力値（センサＡ）と第２の排気圧力センサ検出された
排気圧力値（センサＢ）とを比較し、ステップ３０１で
センサＡ＞センサＢか否かを判定しセンサＡ＞センサＢ
ならステップ３０３に進んで、センサＡがセンサＢに等
しくなるように排気絞り弁３４の開度を大きくするよう
に補正し、ステップ３０１でセンサＡ＞センサＢでない
ならステップ３０２に進んでセンサＡ＜センサＢか否か
を判定し、ステップ３０２でセンサＡ＜センサＢならセ
ンサＡがセンサＢに等しくなるように排気絞り弁３４の
開度を小さくするように補正し、ステップ３０２でセン
サＡ＜センサＢでないなら排気絞り弁３４の開度をその
ままとする。この補正により、常に、センサＡ＝センサ
Ｂが保持されるようになり、第１の排気圧力センサ３５
と第２の排気圧力センサ３６の出力差がゼロ、すなわち
排気圧力差が０となるように排気絞り弁３４が制御され
る。In the third embodiment of the present invention, the opening degree of the exhaust throttle valve 34 shown in FIG. 7 is corrected (closed, that is, the middle degree is opened). The control routine of FIG. 7 is interrupted at predetermined time intervals. The correction is performed by comparing the exhaust pressure value (sensor A) detected by the first exhaust pressure sensor 35 with the exhaust pressure value (sensor B) detected by the second exhaust pressure sensor in step 301 in FIG. In step 301, it is determined whether or not sensor A> sensor B, and sensor A> sensor B
If so, the routine proceeds to step 303, where the correction is made so that the opening of the exhaust throttle valve 34 is increased so that the sensor A becomes equal to the sensor B. If the sensor A is not greater than the sensor B in step 301, the routine proceeds to step 302 and the sensor A < It is determined whether or not the sensor is the sensor B. If the sensor A is smaller than the sensor B in step 302, the opening degree of the exhaust throttle valve 34 is corrected to be smaller so that the sensor A is equal to the sensor B. If it is not B, the opening degree of the exhaust throttle valve 34 is kept as it is. As a result of this correction, the sensor A = sensor B is always held, and the first exhaust pressure sensor 35
The exhaust throttle valve 34 is controlled such that the output difference between the exhaust gas pressure sensor 36 and the second exhaust pressure sensor 36 becomes zero, that is, the exhaust pressure difference becomes zero.

【００２４】本発明の実施例３の作用は、つぎの通りで
ある。還元剤インジェクタ設置気筒の排気管に排気絞り
弁３４を設け、さらに、還元剤インジェクタ設置気筒１
３ａの絞り弁３４の上流に第１の排気圧力センサ３５を
設け、他の気筒１３ｂの排気系のタービン１９より上流
に第２の排気圧力センサ３６を設け、ＥＣＵ２７にて、
第１の排気圧力センサ３５と第２の排気圧力センサ３６
の出力差がゼロとなるように排気絞り弁３４を制御する
ので、還元剤インジェクタ設置気筒１３ａと他の気筒１
３ｂとの背圧が異なることによるトルク段差を、本発明
の実施例２より一層、抑制することができる。The operation of the third embodiment of the present invention is as follows. An exhaust throttle valve 34 is provided in the exhaust pipe of the reducing agent injector installation cylinder.
A first exhaust pressure sensor 35 is provided upstream of the throttle valve 34 of 3a, and a second exhaust pressure sensor 36 is provided upstream of the turbine 19 of the exhaust system of the other cylinder 13b.
First exhaust pressure sensor 35 and second exhaust pressure sensor 36
The exhaust throttle valve 34 is controlled such that the output difference between the cylinders 13a and 13a is zero.
The torque step due to the difference in the back pressure from that of the third embodiment can be further suppressed than in the second embodiment of the present invention.

【００２５】本発明の実施例４は、図４、図８に示すよ
うに、本発明の実施例４が、 隔壁３７で分けられた２つの通路部分３８、３９、
一方の通路部分３８に設けられた還元剤供給用インジェ
クタ１７、他方の通路部分３９に設けられたＥＧＲガス
取り入れ口３２、および 他方の通路部分３９に、設けられた排気絞り弁４
０、において、本発明の実施例１と異なり、他の部分は
本発明の実施例１と同じである。図４では、実施例１と
異なる部分とその近傍のみを示している。図１には示さ
れているが図４には図示を省略されている部分は、図１
に準じる。As shown in FIGS. 4 and 8, the fourth embodiment of the present invention is different from the fourth embodiment in that two passage portions 38 and 39 divided by a partition 37 are provided.
The reducing agent supply injector 17 provided in one passage portion 38, the EGR gas intake port 32 provided in the other passage portion 39, and the exhaust throttle valve 4 provided in the other passage portion 39
0, different from the first embodiment of the present invention, the other parts are the same as the first embodiment of the present invention. FIG. 4 shows only a portion different from the first embodiment and its vicinity. The parts shown in FIG. 1 but not shown in FIG.
According to.

【００２６】本発明の実施例４では、図１に示した本発
明の実施例１と同様に、内燃機関１０がターボ過給機１
８付内燃機関からなり、還元剤インジェクタ設置気筒１
３ａの排気管１６ａはターボ過給機１８のタービン１９
をバイパスし、ＮＯｘ浄化手段１１の上流で、他の気筒
１３ｂの排気管１６ｂに合流している。他の気筒１３ｂ
の排気管１６ｂを流れる排気ガスはターボ過給機１８の
タービン１９を通る。３１は合流点を示す。In Embodiment 4 of the present invention, similarly to Embodiment 1 of the present invention shown in FIG.
8 with internal combustion engine, cylinder 1 with reducing agent injector
The exhaust pipe 16a of 3a is the turbine 19 of the turbocharger 18.
And joins the exhaust pipe 16b of the other cylinder 13b upstream of the NOx purifying means 11. Other cylinder 13b
Exhaust gas flowing through the exhaust pipe 16b of FIG. 31 indicates a junction.

【００２７】本発明の実施例４の内燃機関の排気浄化装
置では、図４、図８に示すように、還元剤インジェクタ
設置気筒１３ａの排気ポート１４ａとそれに連なる排気
管１６ａには、隔壁３７が設けられて、２つの通路部分
３８、３９に分けられている。２つの通路部分３８、３
９のうち一方の通路部分３８に、還元剤供給用インジェ
クタ１７を設けられ、他方の通路部分３９に、ＥＧＲ経
路２２へのＥＧＲガス取り入れ口３２を設けられてい
る。また、他方の通路部分３９の、ＥＧＲガス取り入れ
口３２の下流側には、排気絞り弁４０が設けられ、ＥＧ
ＲのＯＮ領域では排気絞り弁４０が閉とされ、ＥＧＲの
ＯＦＦ領域では排気絞り弁４０が開とされる。排気絞り
弁４０の開閉はＥＣＵ２７によって制御される。In the exhaust gas purifying apparatus for an internal combustion engine according to the fourth embodiment of the present invention, as shown in FIGS. 4 and 8, a partition wall 37 is provided between the exhaust port 14a of the reducing agent injector installation cylinder 13a and the exhaust pipe 16a connected thereto. It is provided and divided into two passage sections 38,39. Two passage sections 38, 3
9, the reducing agent supply injector 17 is provided in one of the passage portions 38, and the EGR gas intake port 32 to the EGR passage 22 is provided in the other passage portion 39. An exhaust throttle valve 40 is provided in the other passage portion 39 downstream of the EGR gas intake port 32,
In the R ON region, the exhaust throttle valve 40 is closed, and in the EGR OFF region, the exhaust throttle valve 40 is opened. The opening and closing of the exhaust throttle valve 40 is controlled by the ECU 27.

【００２８】排気絞り弁４０の開閉制御は、図８に示す
通りである。ステップ４０１でＥＧＲがＯＦＦ領域か否
かが判定され、ＥＧＲがＯＦＦ領域ならステップ４０２
に進んで排気絞り弁４０を開として排気ガスが排出され
るようにし、ＥＧＲがＯＮ領域ならステップ４０３に進
んで排気絞り弁４０を閉として排気ガスがＥＧＲ経路に
流れるようにする。The opening and closing control of the exhaust throttle valve 40 is as shown in FIG. In step 401, it is determined whether or not the EGR is in the OFF region.
Then, the exhaust throttle valve 40 is opened to discharge the exhaust gas. If the EGR is in the ON region, the process proceeds to step 403 to close the exhaust throttle valve 40 so that the exhaust gas flows through the EGR path.

【００２９】また、ステップ４１０で燃料噴射順序が該
当気筒（還元剤インジェクタ設置気筒）１３ａか否かが
判定され、燃料噴射順序が該当気筒である場合はステッ
プ４１１に進んで排気絞り弁４０が開か否かが判定さ
れ、開ならステップ４１２に進んで補正された噴射量
（Ｑa −Ｑb ）と噴射時期（Ｔa −Ｔb ）で筒内燃料噴
射を実行し、ステップ４１０で燃料噴射順序が該当気筒
でない場合はステップ４１４に進んで通常の噴射量Ｑa
と噴射時期Ｔa で筒内燃料噴射を実行し、ステップ４１
１で排気絞り弁４０が開ではないと判定された場合はス
テップ４１３に進んで補正された噴射量（Ｑa −Ｑc ）
と噴射時期（Ｔa −Ｔc ）で筒内燃料噴射を実行する。In step 410, it is determined whether or not the fuel injection sequence is the corresponding cylinder (cylinder in which the reducing agent injector is installed) 13a. If the fuel injection sequence is the corresponding cylinder, the process proceeds to step 411 to open the exhaust throttle valve 40. whether it is determined to perform the in-cylinder fuel injection is willing corrected injection quantity to step 412 if the open (Q a -Q b) and injection timing (T a -T b), the fuel injection sequence at step 410 If is not the corresponding cylinder, the routine proceeds to step 414, where the normal injection amount Q a
Run-cylinder fuel injection in the injection timing T a, step 41
Injection quantity exhaust throttle valve 40 is when it is determined not to be open corrected proceeds to step 413 in 1 (Q a -Q c)
Running the in-cylinder fuel injection in the injection timing (T a -T c).

【００３０】ここで、 Ｑa ：図８のエンジン回転数と負荷とによって求まる燃
料噴射量 Ｔa ：図８のエンジン回転数と負荷とによって求まる燃
料噴射時期 Ｑb ：図８のエンジン回転数と負荷とによって求まる補
正燃料噴射量 Ｔb ：図８のエンジン回転数と負荷とによって求まる補
正燃料噴射時期 Ｑc ：補正燃料噴射量、ただしＱa ＞Ｑc Ｔc ：補正燃料噴射時期、ただしＴa ＞Ｔc とすると、燃料噴射量Ａ、燃料噴射時期Ｂは、ステップ
４１２では、 Ａ←Ｑa −Ｑb Ｂ←Ｔa −Ｔb とおかれて、ターボ過給機をバイパスしているため他の
気筒１３ｂと背圧が異なることによるトルク分、気筒１
３ａの燃料噴射量を調整し、燃料噴射時期を調整する。
同様に、ステップ４１３では、 Ａ←Ｑa −Ｑc Ｂ←Ｔa −Ｔc とおかれて、ターボ過給機をバイパスしているため他の
気筒１３ｂと背圧が異なることによるトルク分、気筒１
３ａの燃料噴射量を調整し、燃料噴射時期を調整する。
ステップ４１４では、 Ａ←Ｑa Ｂ←Ｔa とおかれて、通常の燃料噴射量、燃料噴射時期で燃料噴
射が実行される。[0030] Here, Q a: fuel injection quantity determined by the engine speed and the load and in FIG. 8 T a: determined by the engine speed of FIG. 8 and the load and the fuel injection timing Q b: the engine speed of FIG. 8 determined by the load correction fuel injection amount T b: determined by the engine speed of FIG. 8 and the load and correcting the fuel injection timing Q c: corrected fuel injection amount, provided that Q a> Q c T c: corrected fuel injection timing, where T When a> T c, the fuel injection amount a, the fuel injection timing B, in step 412, is placed as a ← Q a -Q b B ← T a -T b, because it bypasses the turbocharger The amount of torque due to the difference in back pressure from the other cylinders 13b, cylinder 1
The fuel injection amount of 3a is adjusted, and the fuel injection timing is adjusted.
Similarly, in step 413, A ← Q a -Q c B ← T a is placed between -T c, the torque caused by the other cylinders 13b and the back pressure is different because it bypasses the turbocharger, cylinder 1
The fuel injection amount of 3a is adjusted, and the fuel injection timing is adjusted.
In step 414, it is placed as A ← Q a B ← T a , the amount normal fuel injection, fuel injection is executed at the fuel injection timing.

【００３１】本発明の実施例４の作用は、つぎの通りで
ある。本発明の実施例４の内燃機関の排気浄化装置で
は、還元剤インジェクタ設置気筒１３ａの排気ポート１
４ａと排気ポート１４ａにつながる排気管１６ａに隔壁
３７を設けて２つの通路部分３８、３９とし、該２つの
通路部分３８、３９のうち一方の通路部分３８に還元剤
供給用インジェクタ１７を設け、他方の通路部分３９に
ＥＧＲ経路２２へのＥＧＲガス取り入れ口３２を設けた
ので、ＥＧＲクーラ２３側への還元剤の回り込みを少な
くできる。The operation of the fourth embodiment of the present invention is as follows. In the exhaust gas purifying apparatus for an internal combustion engine according to the fourth embodiment of the present invention, the exhaust port 1 of the reducing agent injector installation cylinder 13a is provided.
A partition wall 37 is provided in the exhaust pipe 16a connected to the exhaust port 4a and the exhaust port 14a to form two passage portions 38 and 39, and the reducing agent supply injector 17 is provided in one of the two passage portions 38 and 39, Since the EGR gas intake port 32 to the EGR path 22 is provided in the other passage portion 39, the flow of the reducing agent toward the EGR cooler 23 can be reduced.

【００３２】また、本発明の実施例４の内燃機関の排気
浄化装置では、他方の通路部分３９の、ＥＧＲガス取り
入れ口３２の下流側に、排気絞り弁４０を設け、ＥＧＲ
のＯＮ領域では排気絞り弁４０を閉とし、ＥＧＲのＯＦ
Ｆ領域では排気絞り弁４０を開とするので、ＥＧＲのＯ
Ｎ領域でＥＧＲ量を確保でき、ＥＧＲのＯＦＦ領域でＥ
ＧＲ系の耐圧性を確保することができる。In the exhaust gas purifying apparatus for an internal combustion engine according to the fourth embodiment of the present invention, an exhaust throttle valve 40 is provided in the other passage portion 39 downstream of the EGR gas intake port 32,
, The exhaust throttle valve 40 is closed and the EGR OF
In the F range, the exhaust throttle valve 40 is opened.
The EGR amount can be secured in the N region, and the EGR amount can be secured in the EGR OFF region.
The pressure resistance of the GR system can be ensured.

【００３３】[0033]

【発明の効果】請求項１の内燃機関の排気浄化装置によ
れば、リーンでＮＯｘを吸蔵し吸蔵ＮＯｘをリッチで放
出し還元するＮＯｘ浄化手段を排気系に備え、気筒の排
気ポートにまたは気筒に直接、前記リッチを作成するた
めの還元剤供給用のインジェクタを設置した還元剤イン
ジェクタ設置気筒を複数気筒の一部に有する多気筒内燃
機関の排気浄化装置であって、還元剤インジェクタ設置
気筒の排気ポートに連なる排気管を他の気筒の排気マニ
ホールドから独立させ、還元剤インジェクタ設置気筒の
排気管を他の気筒の排気マニホールドに連なる排気管と
ＮＯｘ浄化手段の上流で合流させたので、排気ポートで
還元剤を噴くにかかわらず、噴いた還元剤の排気通路へ
の付着の少ない内燃機関（ディーゼルエンジンでもガソ
リンエンジンでも可、また、ターボ過給機付きエンジ
ン、ターボ過給機を具備しないエンジンでも可）の排気
浄化装置とすることができる。請求項２の内燃機関の排
気浄化装置によれば、内燃機関がターボ過給機付内燃機
関からなり、還元剤インジェクタ設置気筒の排気管はタ
ーボをバイパスしＮＯｘ浄化手段の上流で他の気筒の排
気管に合流しているので、ターボ過給機のタービンを含
む排気通路への付着の少ない内燃機関の排気浄化装置と
することができる。請求項３の内燃機関の排気浄化装置
によれば、ＥＧＲ経路を有し、ＥＧＲ経路への排気ガス
の取り入れ口を、前記他の気筒と連通する排気経路部分
に設けたので、ＥＧＲクーラ側への還元剤の回り込みを
少なくできる。請求項４の内燃機関の排気浄化装置によ
れば、前記還元剤インジェクタ設置気筒のみ、前記他の
気筒と背圧が異なることによるトルク段差抑制のため
の、筒内燃料噴射用インジェクタの噴射量・噴射時期の
補正が行われるので、還元剤インジェクタ設置気筒と他
の気筒との背圧が異なることによるトルク段差を抑制す
ることができる。請求項５の内燃機関の排気浄化装置に
よれば、還元剤インジェクタ設置気筒の排気管に排気絞
り弁を設け背圧制御を行うので、還元剤インジェクタ設
置気筒と他の気筒との背圧が異なることによるトルク段
差を抑制することができる。請求項６の内燃機関の排気
浄化装置によれば、還元剤インジェクタ設置気筒の排気
管に排気絞り弁を設けるとともに排気絞り弁の上流側に
第１の排気圧力センサを設け、前記他の気筒の排気管の
ターボ過給機のタービンの上流側に第２の排気圧力セン
サを設け、第１の排気圧力センサと第２の排気圧力セン
サの出力差がゼロとなるように排気絞り弁を制御するの
で、還元剤インジェクタ設置気筒と他の気筒との背圧が
異なることによるトルク段差を抑制することができる。
請求項７の内燃機関の排気浄化装置によれば、還元剤イ
ンジェクタ設置気筒の排気ポートと該排気ポートにつな
がる排気管に隔壁を設けて２つの通路部分とし、該２つ
の通路部分のうち一方の通路部分に還元剤供給用インジ
ェクタを設け、他方の通路部分にＥＧＲ経路へのＥＧＲ
ガス取り入れ口を設けたので、ＥＧＲクーラ側への還元
剤の回り込みを少なくできる。請求項８の内燃機関の排
気浄化装置によれば、他方の通路部分の、ＥＧＲガス取
り入れ口の下流側に、排気絞り弁を設け、ＥＧＲのＯＮ
領域では前記排気絞り弁を閉とし、ＥＧＲのＯＦＦ領域
では前記排気絞り弁を開とするので、ＥＧＲのＯＮ領域
でＥＧＲ量を確保でき、ＥＧＲのＯＦＦ領域でＥＧＲ系
の耐圧性を確保することができる。According to the exhaust gas purifying apparatus for an internal combustion engine of the present invention, NOx purifying means for leanly storing NOx and releasing and reducing the stored NOx in a rich manner is provided in the exhaust system. Directly, an exhaust purification device of a multi-cylinder internal combustion engine having a reducing agent injector installation cylinder in which a reducing agent supply injector for creating the rich is installed in a part of a plurality of cylinders, wherein the reducing agent injector installation cylinder The exhaust pipe connected to the exhaust port is made independent of the exhaust manifold of the other cylinder, and the exhaust pipe of the cylinder in which the reducing agent injector is installed merges with the exhaust pipe connected to the exhaust manifold of the other cylinder upstream of the NOx purifying means. Internal combustion engine (both diesel and gasoline engines) with little adhesion of the injected reducing agent to the exhaust passage, In addition, a turbocharged engine, even engine having no turbocharger may be an exhaust purification device of the variable). According to the exhaust gas purifying apparatus for an internal combustion engine of the second aspect, the internal combustion engine is an internal combustion engine with a turbocharger, and the exhaust pipe of the cylinder in which the reducing agent injector is installed bypasses the turbo, and the exhaust pipe of the other cylinder upstream of the NOx purification means. Since it joins the exhaust pipe, it is possible to provide an exhaust gas purification device for an internal combustion engine with less adhesion to an exhaust passage including a turbine of a turbocharger. According to the exhaust gas purifying apparatus for an internal combustion engine according to the third aspect, since the exhaust gas purifying apparatus has an EGR path and the exhaust gas intake port to the EGR path is provided in the exhaust path communicating with the other cylinder, the exhaust gas purifying apparatus is directed to the EGR cooler side. Around the reducing agent can be reduced. According to the exhaust gas purifying apparatus for an internal combustion engine of claim 4, the injection amount of the in-cylinder fuel injection injector is used only for the reducing agent injector-installed cylinder to suppress a torque step due to a difference in back pressure from the other cylinders. Since the injection timing is corrected, a torque step due to a difference in back pressure between the cylinder in which the reducing agent injector is installed and another cylinder can be suppressed. According to the exhaust gas purifying apparatus for an internal combustion engine of the fifth aspect, the exhaust pressure of the cylinder provided with the reducing agent injector is different from that of the other cylinders since the exhaust pressure regulating valve is provided in the exhaust pipe of the cylinder provided with the reducing agent injector. This can suppress a torque step due to this. According to the exhaust gas purifying apparatus for an internal combustion engine of the sixth aspect, an exhaust throttle valve is provided in the exhaust pipe of the cylinder in which the reducing agent injector is installed, and the first exhaust pressure sensor is provided upstream of the exhaust throttle valve, and the other exhaust cylinder is provided. A second exhaust pressure sensor is provided on the exhaust pipe upstream of the turbine of the turbocharger, and the exhaust throttle valve is controlled such that the output difference between the first exhaust pressure sensor and the second exhaust pressure sensor becomes zero. Therefore, it is possible to suppress a torque step due to a difference in back pressure between the cylinder in which the reducing agent injector is installed and another cylinder.
According to the exhaust gas purifying apparatus for an internal combustion engine of the seventh aspect, a partition is provided in the exhaust port of the cylinder in which the reducing agent injector is installed and the exhaust pipe connected to the exhaust port to form two passage portions, and one of the two passage portions is provided. An injector for supplying a reducing agent is provided in the passage, and EGR to the EGR path is provided in the other passage.
Since the gas inlet is provided, it is possible to reduce the flow of the reducing agent to the EGR cooler side. According to the exhaust gas purifying apparatus for an internal combustion engine of the eighth aspect, an exhaust throttle valve is provided downstream of the EGR gas intake port in the other passage portion, and the EGR is turned on.
Since the exhaust throttle valve is closed in the region and the exhaust throttle valve is opened in the EGR OFF region, the EGR amount can be secured in the EGR ON region, and the pressure resistance of the EGR system is secured in the EGR OFF region. Can be.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の実施例１の内燃機関の排気浄化装置の
系統図である。FIG. 1 is a system diagram of an exhaust gas purification device for an internal combustion engine according to a first embodiment of the present invention.

【図２】本発明の実施例２の内燃機関の排気浄化装置の
系統図である。FIG. 2 is a system diagram of an exhaust gas purifying apparatus for an internal combustion engine according to a second embodiment of the present invention.

【図３】本発明の実施例３の内燃機関の排気浄化装置の
系統図である。FIG. 3 is a system diagram of an exhaust gas purifying apparatus for an internal combustion engine according to a third embodiment of the present invention.

【図４】本発明の実施例４の内燃機関の排気浄化装置の
系統図である。FIG. 4 is a system diagram of an exhaust gas purifying apparatus for an internal combustion engine according to a fourth embodiment of the present invention.

【図５】本発明の実施例１の内燃機関の排気浄化装置の
制御ルーチンのフローチャートである。FIG. 5 is a flowchart of a control routine of the exhaust gas purification device for an internal combustion engine according to the first embodiment of the present invention.

【図６】本発明の実施例２の内燃機関の排気浄化装置の
制御ルーチンのフローチャートである。FIG. 6 is a flowchart of a control routine of an exhaust gas purification device for an internal combustion engine according to a second embodiment of the present invention.

【図７】本発明の実施例３の内燃機関の排気浄化装置の
制御ルーチンのフローチャートである。FIG. 7 is a flowchart of a control routine of an exhaust gas purification device for an internal combustion engine according to a third embodiment of the present invention.

【図８】本発明の実施例４の内燃機関の排気浄化装置の
制御ルーチンのフローチャートである。FIG. 8 is a flowchart of a control routine of an exhaust gas purification device for an internal combustion engine according to a fourth embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１０ 内燃機関 １１ ＮＯｘ浄化手段 １２ 三元触媒または酸化触媒 １３ 気筒 １３ａ 還元剤インジェクタ設置気筒 １３ｂ その他の気筒 １４ 排気ポート １４ａ 還元剤インジェクタ設置気筒の排気ポート １４ｂ その他の気筒の排気ポート １５ 排気マニホールド １５ｂ その他の気筒の排気マニホールド １６ 排気管 １６ａ 還元剤インジェクタ設置気筒の排気管 １６ｂ その他の気筒の排気管 １７ 還元剤供給用のインジェクタ １８ ターボ過給機 １９ タービン ２０ コンプレッサ ２１ マフラー ２２ ＥＧＲ経路 ２３ ＥＧＲクーラ ２４ ＥＧＲバルブ ２５ 吸気マニホールド ２６ 吸気絞り ２７ ＥＣＵ ２８ エアフローメータ ２９ エアクリーナ ３０ 筒内燃料噴射用インジェクタ ３１ 合流点 ３２ ＥＧＲガス取り入れ口 ３３ ＥＧＲガス出口 ３４ 排気絞り弁 ３５ 第１の排気圧力センサ ３６ 第２の排気圧力センサ ３７ 隔壁 ３８、３９ ２つの通路部分 ４０ 排気絞り弁 Reference Signs List 10 Internal combustion engine 11 NOx purification means 12 Three-way catalyst or oxidation catalyst 13 Cylinder 13a Reducing agent injector installation cylinder 13b Other cylinders 14 Exhaust port 14a Reducing agent injector installation cylinder 14b Exhaust port of other cylinders 15 Exhaust manifold 15b Others Exhaust manifold 16 of the cylinder 16 Exhaust pipe 16a Exhaust pipe of the cylinder in which the reducing agent injector is installed 16b Exhaust pipe of other cylinders 17 Injector for supplying the reducing agent 18 Turbocharger 19 Turbine 20 Compressor 21 Muffler 22 EGR route 23 EGR cooler 24 EGR Valve 25 Intake manifold 26 Intake throttle 27 ECU 28 Air flow meter 29 Air cleaner 30 In-cylinder fuel injector 31 Merging point 32 EGR gas intake 33 EGR gas outlet 34 Exhaust throttle valve 35 First exhaust pressure sensor 36 Second exhaust pressure sensor 37 Partition walls 38, 39 Two passages 40 Exhaust throttle valve

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０１Ｎ 3/24 Ｆ０１Ｎ 3/24 Ｒ ３Ｇ０９２ Ｓ ３Ｇ３０１ Ｔ ４Ｄ０４８ 3/28 ３０１Ｃ 3/28 ３０１ Ｆ０２Ｂ 37/00 ３０２Ｆ Ｆ０２Ｂ 37/00 ３０２ Ｆ０２Ｄ 9/04 Ｃ Ｆ０２Ｄ 9/04 Ｅ Ｇ 21/08 ３０１Ｃ 21/08 ３０１ ３１１Ｂ ３１１ 23/00 Ｊ 23/00 Ｐ 41/04 ３６０Ａ 41/04 ３６０ 43/00 ３０１Ｅ 43/00 ３０１ ３０１Ｎ ３０１Ｔ ３０１Ｚ 45/00 ３７２Ｂ 45/00 ３７２ Ｆ０２Ｍ 25/07 ５８０Ａ Ｆ０２Ｍ 25/07 ５８０ Ｂ０１Ｄ 53/36 １０１Ｂ Ｆターム(参考） 3G005 FA27 FA35 GB24 GB28 JA03 JA28 JA39 3G062 AA01 AA03 AA04 AA05 BA04 BA05 BA06 EA10 ED01 ED08 GA01 GA06 GA22 3G065 AA01 AA03 AA04 AA09 CA12 DA04 EA01 EA07 EA10 GA05 GA06 GA10 HA06 KA02 3G084 AA01 AA03 AA04 BA08 BA13 BA15 BA19 BA20 BA24 DA10 DA27 EA11 EB01 EB04 EC08 FA07 FA33 3G091 AA10 AA11 AA12 AA17 AA18 AA24 AA28 AB02 AB03 AB06 BA03 BA14 BA15 BA19 BA33 CA13 CA18 CB02 CB03 CB06 CB07 CB08 DA01 DA02 DA04 DB10 EA01 EA03 EA05 EA30 EA32 FA02 FA04 FA12 FA13 FB02 FB10 FB12 FC02 FC04 FC07 GB06W HA08 HA09 HA36 HA42 HA47 HB02 HB03 HB05 HB06 3G092 AA02 AA06 AA13 AA17 AA18 BB01 BB06 DB03 DC08 DC12 DE02S DE03S DG07 EA11 EA28 EA29 EB05 FA15 GA01 GA03 GA16 HD08Z HE01Z 3G301 HA01 HA02 HA04 HA06 HA07 HA11 HA13 HA15 JA21 JA25 JA26 LB04 LB11 MA01 MA11 MA18 MA26 NA06 NA07 NA08 NB12 NB18 NE01 NE06 NE13 NE15 PA01B PA01Z PA17B PA17Z PD14B PD14Z PE01B PE01Z PE05B PE05Z 4D048 AA06 AB02 AB07 AC02 BA15X BA18X BA30X BA41X BA45X CC24 CC26 CC27 CC32 CC47 CC61 DA01 DA02 DA03 DA07 DA10 DA20 EA04 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F01N 3/24 F01N 3/24 R 3G092 S 3G301 T 4D048 3/28 301C 3/28 301 F02B 37/00 302F F02B 37/00 302 F02D 9/04 C F02D 9/04 EG 21/08 301C 21/08 301 311B 311 23/00 J 23/00 P 41/04 360A 41/04 360 43/00 301E 43/00 301 301N 301T 301Z 45/00 372B 45/00 372 F02M 25/07 580A F02M 25/07 580 B01D 53/36 101B F-term (reference) 3G005 FA27 FA35 GB24 GB28 JA03 JA28 JA39 3G062 AA01 AA03 AA04 AA05 EA04 GA01 GA06 GA22 3G065 AA01 AA03 AA04 AA09 CA12 DA04 EA01 EA07 EA10 GA05 GA06 GA10 HA06 KA02 3G084 AA01 AA03 AA04 BA08 BA13 BA15 BA19 BA20 BA24 DA10 DA27 EA11 EB01 EB04 EC08 FA07 FA33 3G091 AA10 AA11 AA12 AA17 AA18 AA24 AA28 AB02 AB03 AB06 BA03 BA14 BA13 CB01 DA03 CB01 DA02 EA03 EA05 EA30 EA32. HA02 HA04 HA06 HA07 HA11 HA13 HA15 JA21 JA25 JA26 LB04 LB11 MA01 MA11 MA18 MA26 NA06 NA07 NA08 NB12 NB18 NE01 NE06 NE13 NE15 PA01B PA01Z PA17B PA17Z PD14B PD14Z PE01B PE01Z PE05B PE05Z 4D048 AA06 CC02 BA02X07 CC02 BA02X CC61 DA01 DA02 DA03 DA07 DA10 DA20 EA04

Claims (8)

【特許請求の範囲】[Claims] 【請求項１】 リーンでＮＯｘを吸蔵し吸蔵ＮＯｘをリ
ッチで放出し還元するＮＯｘ浄化手段を排気系に備え、
気筒の排気ポートにまたは気筒に直接、前記リッチを作
成するための還元剤供給用のインジェクタを設置した還
元剤インジェクタ設置気筒を複数気筒の一部に有する多
気筒内燃機関の排気浄化装置であって、還元剤インジェ
クタ設置気筒の排気ポートに連なる排気管を他の気筒の
排気マニホールドから独立させ、該還元剤インジェクタ
設置気筒の排気管を他の気筒の排気マニホールドに連な
る排気管と前記ＮＯｘ浄化手段の上流で合流させた内燃
機関の排気浄化装置。An exhaust system is provided with NOx purifying means for storing NOx lean and releasing and reducing the stored NOx in a rich manner,
An exhaust purification device for a multi-cylinder internal combustion engine having a reducing agent injector installation cylinder in which a reducing agent supply injector for creating the rich is installed in a part of a plurality of cylinders, at an exhaust port of the cylinder or directly to the cylinder. The exhaust pipe connected to the exhaust port of the reducing agent injector installation cylinder is made independent of the exhaust manifold of the other cylinder, and the exhaust pipe of the reducing agent injector installation cylinder is connected to the exhaust pipe connected to the exhaust manifold of the other cylinder and the NOx purification means. An exhaust gas purification device for an internal combustion engine joined upstream. 【請求項２】 前記内燃機関がターボ過給機付内燃機関
からなり、前記還元剤インジェクタ設置気筒の排気管は
ターボをバイパスし前記ＮＯｘ浄化手段の上流で前記他
の気筒の排気管に合流している請求項１記載の内燃機関
の排気浄化装置。2. The internal combustion engine comprises a turbocharged internal combustion engine, and an exhaust pipe of a cylinder in which the reducing agent injector is installed bypasses a turbo and joins an exhaust pipe of the other cylinder upstream of the NOx purifying means. The exhaust gas purifying apparatus for an internal combustion engine according to claim 1. 【請求項３】 ＥＧＲ経路を有し、ＥＧＲ経路への排気
ガスの取り入れ口を、前記他の気筒と連通する排気経路
部分に設けた請求項１または請求項２記載の内燃機関の
排気浄化装置。3. The exhaust gas purifying apparatus for an internal combustion engine according to claim 1, further comprising an EGR path, wherein an exhaust gas intake port to the EGR path is provided in an exhaust path portion communicating with the other cylinder. . 【請求項４】 前記還元剤インジェクタ設置気筒のみ、
前記他の気筒と背圧が異なることによるトルク段差抑制
のための、筒内燃料噴射用インジェクタの噴射量・噴射
時期の補正が行われる請求項１または請求項２記載の内
燃機関の排気浄化装置。4. Only the reducing agent injector installation cylinder,
3. The exhaust gas purifying apparatus for an internal combustion engine according to claim 1, wherein correction of an injection amount and an injection timing of an in-cylinder fuel injector is performed for suppressing a torque step due to a difference in back pressure from the other cylinders. . 【請求項５】 前記還元剤インジェクタ設置気筒の排気
管に排気絞り弁を設け背圧制御を行う請求項１または請
求項２記載の内燃機関の排気浄化装置。5. The exhaust gas purifying apparatus for an internal combustion engine according to claim 1, wherein an exhaust throttle valve is provided in an exhaust pipe of the cylinder in which the reducing agent injector is installed to perform back pressure control. 【請求項６】 前記還元剤インジェクタ設置気筒の排気
管に排気絞り弁を設けるとともに前記排気絞り弁の上流
側に第１の排気圧力センサを設け、前記他の気筒の排気
管のターボ過給機のタービンの上流側に第２の排気圧力
センサを設け、第１の排気圧力センサと第２の排気圧力
センサの出力差がゼロとなるように前記排気絞り弁を制
御する請求項２記載の内燃機関の排気浄化装置。6. An exhaust throttle valve is provided in an exhaust pipe of a cylinder in which the reducing agent injector is installed, and a first exhaust pressure sensor is provided upstream of the exhaust throttle valve, and a turbocharger for an exhaust pipe of the other cylinder is provided. 3. The internal combustion engine according to claim 2, wherein a second exhaust pressure sensor is provided upstream of the turbine, and the exhaust throttle valve is controlled such that an output difference between the first exhaust pressure sensor and the second exhaust pressure sensor becomes zero. Engine exhaust purification device. 【請求項７】 前記還元剤インジェクタ設置気筒の排気
ポートと該排気ポートにつながる排気管に隔壁を設けて
２つの通路部分とし、該２つの通路部分のうち一方の通
路部分に前記還元剤供給用インジェクタを設け、他方の
通路部分にＥＧＲ経路へのＥＧＲガス取り入れ口を設け
た請求項１または請求項２記載の内燃機関の排気浄化装
置。7. A partition is provided in an exhaust port of the reducing agent injector installation cylinder and an exhaust pipe connected to the exhaust port to form two passage portions, and one of the two passage portions is provided with the reducing agent supply passage. 3. The exhaust gas purification device for an internal combustion engine according to claim 1, wherein an injector is provided, and an EGR gas intake port for an EGR path is provided in the other passage portion. 【請求項８】 前記他方の通路部分の、前記ＥＧＲガス
取り入れ口の下流側に、排気絞り弁を設け、ＥＧＲのＯ
Ｎ領域では前記排気絞り弁を閉とし、ＥＧＲのＯＦＦ領
域では前記排気絞り弁を開とする請求項７記載の内燃機
関の排気浄化装置。8. An exhaust throttle valve is provided downstream of the EGR gas intake port in the other passage portion, and an OGR valve for the EGR gas is provided.
The exhaust gas purification apparatus for an internal combustion engine according to claim 7, wherein the exhaust throttle valve is closed in an N region, and the exhaust throttle valve is opened in an EGR OFF region.
JP2001053896A 2001-02-28 2001-02-28 Exhaust emission control device for internal combustion engine Pending JP2002256854A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Publications (1)

Publication Number Publication Date
JP2002256854A true JP2002256854A (en) 2002-09-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009536283A (en) * 2006-04-13 2009-10-08 マック トラックス インコーポレイテッド Engine having exhaust gas treatment device and method for treating engine exhaust gas
CN109653886A (en) * 2018-12-05 2019-04-19 汽解放汽车有限公司 A kind of engine exhaust heat riser

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009536283A (en) * 2006-04-13 2009-10-08 マック トラックス インコーポレイテッド Engine having exhaust gas treatment device and method for treating engine exhaust gas
CN109653886A (en) * 2018-12-05 2019-04-19 汽解放汽车有限公司 A kind of engine exhaust heat riser

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