JP2002322906A - Particulate filter regenerating method and the device - Google Patents

Particulate filter regenerating method and the device

Info

Publication number
JP2002322906A
JP2002322906A JP2001129227A JP2001129227A JP2002322906A JP 2002322906 A JP2002322906 A JP 2002322906A JP 2001129227 A JP2001129227 A JP 2001129227A JP 2001129227 A JP2001129227 A JP 2001129227A JP 2002322906 A JP2002322906 A JP 2002322906A
Authority
JP
Japan
Prior art keywords
post
injection
dpf
oxygen concentration
particulate filter
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
JP2001129227A
Other languages
Japanese (ja)
Inventor
Ryusuke Fujino
竜介 藤野
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.)
Isuzu Motors Ltd
Original Assignee
Isuzu Motors Ltd
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 Isuzu Motors Ltd filed Critical Isuzu Motors Ltd
Priority to JP2001129227A priority Critical patent/JP2002322906A/en
Publication of JP2002322906A publication Critical patent/JP2002322906A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F02D41/405—Multiple injections with post injections
    • 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

Abstract

PROBLEM TO BE SOLVED: To accurately identify the starting timing of PM combustion by monitoring the oxygen concentration at a DPF exit side. To prevent the DPF breakage and melting loss due to continuing of post-injection even when the regeneration starts. SOLUTION: The particulate filter regenerating device regenerates a particulate filter 11 collecting the particulate contained in the exhaust gas of an engine 1 by post-injection. This device is comprised of an oxygen concentration detecting sensor 12 set at the exit side of the particulate filter 11, and a post- injection controller 20 stopping the post-injection when the oxygen concentration input from the oxygen concentration detecting sensor 12 is less than and equal to the setting.

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、エンジンの排ガス
中に含まれるパティキュレートを捕集するパティキュレ
ートフィルタをポスト噴射によって再生させるパティキ
ュレートフィルタ再生方法及び装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particulate filter regeneration method and apparatus for regenerating a particulate filter for collecting particulates contained in exhaust gas of an engine by post-injection.

【０００２】[0002]

【従来の技術】従来、ディーゼルエンジンから排出され
た排ガス中に含まれている可溶性有機物（ＳＯＦ）や、
煤（ドライスート）などの粒子状物質（以下、ＰＭと称
する）を捕集して燃焼させ、排ガスを浄化する排ガス浄
化装置が知られている。2. Description of the Related Art Conventionally, soluble organic matter (SOF) contained in exhaust gas discharged from a diesel engine,
BACKGROUND ART There is known an exhaust gas purifying apparatus that collects and burns particulate matter (hereinafter, referred to as PM) such as soot (dry soot) to purify exhaust gas.

【０００３】この排ガス浄化装置は、ディーゼルパティ
キュレートフィルタ（以下、ＤＰＦと称する）によって
排ガス中のＰＭを捕集し、それが一定量堆積すると、ヒ
ーターによってＤＰＦを加熱して堆積したＰＭを燃焼さ
せ、ＤＰＦの再生を行っている。In this exhaust gas purifying device, PM in exhaust gas is collected by a diesel particulate filter (hereinafter referred to as DPF), and when a certain amount of PM is accumulated, the DPF is heated by a heater to burn the accumulated PM. And DPF regeneration.

【０００４】一方、ＤＰＦを再生させる方法として、ヒ
ーターによってＤＰＦを加熱する代わりに、ポスト噴
射、即ち、爆発行程後半、あるいは排気行程中に燃料を
噴射して燃焼させることによって排気温度を上げ、ＤＰ
Ｆを再生温度まで昇温させるＤＰＦ再生方法がある。On the other hand, as a method of regenerating the DPF, instead of heating the DPF with a heater, the exhaust gas temperature is increased by injecting and burning fuel during the post injection, that is, the latter half of the explosion stroke or during the exhaust stroke.
There is a DPF regeneration method in which F is heated to a regeneration temperature.

【０００５】また、連続再生型ＤＰＦシステムの場合に
も、排ガス温度が低温の状態で触媒が活性化しない時、
ポスト噴射によって強制的に排ガス温度を上げて自己再
生することが行われる。In the case of a continuous regeneration type DPF system, when the catalyst is not activated at a low exhaust gas temperature,
Self-regeneration is performed by forcibly increasing the exhaust gas temperature by post-injection.

【０００６】しかし、ＤＰＦが再生を開始した後もポス
ト噴射を継続して行っていると、ポスト噴射による排気
温度上昇に、ＰＭの燃焼による発生熱が加わるため、Ｄ
ＰＦが必要以上の高温に曝され、ＤＰＦの破損を招く危
険がある。However, if post-injection is continued even after the DPF starts regeneration, the heat generated by the combustion of PM is added to the rise in exhaust gas temperature due to post-injection.
The PF is exposed to an excessively high temperature, and there is a danger that the DPF may be damaged.

【０００７】そこで、従来においては、ＤＰＦが再生す
ると減少するＤＰＦ前後の差圧を検出することによって
ＤＰＦ再生の有無を検知することが行なわれていた。Therefore, conventionally, the presence or absence of DPF regeneration has been detected by detecting a differential pressure across the DPF that decreases when the DPF is regenerated.

【０００８】[0008]

【発明が解決しようとする課題】しかしながら、差圧に
よるＤＰＦ再生検知方法は、ＤＰＦ前後の差圧が下がり
始めた時は（図５（ｂ）参照）、既にＤＰＦの再生が始
まっており、その時点でポスト噴射を停止（図５（ａ）
参照）しても既に手遅れとなり、ＤＰＦ温度がＤＰＦの
破損、或いは溶損するところまで上昇してしまう危険性
がある（図５（ａ）参照）。However, according to the DPF regeneration detection method based on the differential pressure, when the differential pressure before and after the DPF starts to decrease (see FIG. 5B), the regeneration of the DPF has already started. Stop post injection at time (Fig. 5 (a)
(See FIG. 5 (a)), and there is a risk that the DPF temperature will rise to the point where the DPF is damaged or melted.

【０００９】本発明は、係る従来の問題に鑑みてなされ
たものであり、その目的とするところは、ＤＰＦ出口側
の酸素濃度をモニターすることによってＰＭ燃焼開始時
期を正確に見極め、ＤＰＦの再生が始まってもポスト噴
射を継続することに起因するＤＰＦの破損や溶損を防止
するパティキュレートフィルタ再生方法及び装置を提供
することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to monitor the oxygen concentration at the DPF outlet side to accurately determine the PM combustion start timing, thereby regenerating the DPF. It is an object of the present invention to provide a particulate filter regeneration method and apparatus for preventing breakage and melting of the DPF caused by continuing post injection even after the start of the injection.

【００１０】[0010]

【課題を解決するための手段】上記課題を解決するた
め、本発明は、次のように構成されている。Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows.

【００１１】すなわち、 （１） エンジンの排ガス中に含まれるパティキュレー
トを捕集するパティキュレートフィルタをポスト噴射に
よって再生させるパティキュレートフィルタ再生方法に
おいて、前記パティキュレートフィルタの出口側の酸素
濃度が設定値以下になった時点でポスト噴射を停止する
ことを特徴とするパティキュレートフィルタ再生方法。(1) In a particulate filter regeneration method for regenerating a particulate filter for collecting particulates contained in exhaust gas of an engine by post-injection, an oxygen concentration at an outlet side of the particulate filter is set to a predetermined value. A method for regenerating a particulate filter, wherein post-injection is stopped when the following occurs.

【００１２】（２） エンジンの排ガス中に含まれるパ
ティキュレートを捕集するパティキュレートフィルタを
ポスト噴射によって再生させるパティキュレートフィル
タ再生装置において、前記パティキュレートフィルタの
出口側に設けた酸素濃度検出センサーと、該酸素濃度検
出センサーから入力する酸素濃度が所定値以下になった
時点でポスト噴射を停止させるポスト噴射制御装置とか
ら成るパティキュレートフィルタ再生装置。(2) In a particulate filter regenerating apparatus for regenerating a particulate filter for collecting particulates contained in exhaust gas of an engine by post-injection, an oxygen concentration detection sensor provided on an outlet side of the particulate filter; A post-injection control device for stopping post-injection when the oxygen concentration input from the oxygen concentration detection sensor falls below a predetermined value.

【００１３】[0013]

【発明の実施の形態】以下、本発明の実施の形態を図面
を用いて説明する。Embodiments of the present invention will be described below with reference to the drawings.

【００１４】図１において、１は、ディーゼルエンジン
を示す。このディーゼルエンジン１は、コモンレール式
燃料噴射システムを採用しており、燃料噴射ノズル２の
頂部にソレノイド３を備えている。そして、ソレノイド
３に通電すると、針弁（図示せず）が上方に押し上げら
れ、燃料噴射孔（図示せず）から燃料が噴射されるよう
になっている。図中、４はソレノイド３をオン・オフす
るコントローラを示している。In FIG. 1, reference numeral 1 denotes a diesel engine. The diesel engine 1 employs a common rail fuel injection system, and includes a solenoid 3 at the top of a fuel injection nozzle 2. When the solenoid 3 is energized, a needle valve (not shown) is pushed upward, and fuel is injected from a fuel injection hole (not shown). In the figure, reference numeral 4 denotes a controller for turning on / off the solenoid 3.

【００１５】また、このディーゼルエンジン１は、過給
機５のタービン６側に排気管７を接続すると共に、排気
管７の途中に排ガス浄化装置８を備えている。この排ガ
ス浄化装置８は、キャニング容器９内に酸化触媒１０、
及びディーゼルパティキュレートフィルタ（以下、ＤＰ
Ｆと称する）１１をこの順に内蔵している。ＤＰＦ１１
は、ハニカム構造を有するセラミックス製のフィルタで
あり、排ガス中の含まれているＰＭを捕集するようにな
っている。The diesel engine 1 has an exhaust pipe 7 connected to the turbine 6 side of the supercharger 5 and an exhaust gas purifier 8 in the exhaust pipe 7. The exhaust gas purifying device 8 includes an oxidation catalyst 10 in a canning container 9,
And diesel particulate filters (hereinafter referred to as DP
F) 11 are built in this order. DPF11
Is a ceramic filter having a honeycomb structure, which traps PM contained in exhaust gas.

【００１６】更に、ＤＰＦ１１の出口側に酸素濃度検出
センサー１２を配置し、ＤＰＦ１１の再生開始によって
消費される酸素量の変化を検知するようになっている。
酸素濃度検出センサー１２は、エンジンコントロールユ
ニット（以下、ＥＣＵと称する）２０に電気的に接続さ
れている。Further, an oxygen concentration detection sensor 12 is arranged at the outlet side of the DPF 11 so as to detect a change in the amount of oxygen consumed when the regeneration of the DPF 11 is started.
The oxygen concentration detection sensor 12 is electrically connected to an engine control unit (hereinafter, referred to as ECU) 20.

【００１７】ＥＣＵ２０は、ディーゼルエンジン１の燃
料噴射量制御などの基本制御を行なうのみならず、この
実施の形態では、ＤＰＦの再生制御、換言すれば、ポス
ト噴射制御を行なっている。The ECU 20 performs not only basic control such as fuel injection amount control of the diesel engine 1, but also performs DPF regeneration control, in other words, post-injection control in this embodiment.

【００１８】即ち、図２はポスト噴射制御のフロー図で
あるが、この図に示すように、ポスト噴射を開始すると
（１０１）、酸素濃度検出センサー１２からＥＣＵ２０
にＤＰＦ出口側の酸素濃度が入力される（１０２）。そ
して、ＤＰＦ出口側の酸素濃度が、予め、ＥＣＵ２０に
記憶させておいた設定値（例えば、３％）以下に下がる
と（１０３）、ＥＣＵ２０から燃料噴射ノズル２のコン
トローラ４にポスト噴射停止指令が発せられる（１０
４）。ＤＰＦ出口側の酸素濃度が所定値以下にならない
場合は、再生不可能と判断して継続してポスト噴射が行
なわれる。That is, FIG. 2 is a flowchart of the post injection control. As shown in FIG. 2, when the post injection is started (101), the oxygen concentration detection sensor 12 sends the ECU 20
The oxygen concentration at the DPF outlet side is input to (102). When the oxygen concentration at the DPF outlet side falls below a set value (for example, 3%) stored in the ECU 20 in advance (103), a post-injection stop command is issued from the ECU 20 to the controller 4 of the fuel injection nozzle 2. Emitted (10
4). When the oxygen concentration on the DPF outlet side does not become lower than the predetermined value, it is determined that the regeneration is impossible, and the post injection is continuously performed.

【００１９】図３は、ポスト噴射制御系の模式図であ
り、ＤＰＦ再生指令が出ると、ポスト噴射制御ロジック
２１に基づいてポスト噴射制御出力２２がコモンレール
式燃料噴射ノズル２のコントローラ４に指令され、ポス
ト噴射が開始される。そして、酸素濃度検出センサー１
２からＥＣＵ２０に入力されるＤＰＦ出口側の酸素濃度
が３％以下になると、スイッチ２３が下方に下げられ、
つまり、スイッチ２３が切られ、ポスト噴射が停止され
る。FIG. 3 is a schematic diagram of the post injection control system. When a DPF regeneration command is issued, a post injection control output 22 is commanded to the controller 4 of the common rail type fuel injection nozzle 2 based on the post injection control logic 21. , Post injection is started. And the oxygen concentration detection sensor 1
When the oxygen concentration at the DPF outlet side input from 2 to the ECU 20 becomes 3% or less, the switch 23 is lowered,
That is, the switch 23 is turned off, and the post injection is stopped.

【００２０】上記ＤＰＦ再生指令は、例えば、ＤＰＦに
捕集されたＰＭ量が設定値を超える毎に、或いは、上記
ディーゼルエンジンを搭載した車両が一定距離を走行す
る毎に発せられる。また、ＤＰＦ入口に温度センサーを
設け、ＤＰＦ入口温度が所定値以下で捕集されたＰＭ量
が設定値を超えた場合にも発せられる。The DPF regeneration command is issued, for example, every time the amount of PM trapped in the DPF exceeds a set value, or each time a vehicle equipped with the diesel engine travels a certain distance. Further, a temperature sensor is provided at the DPF inlet, and the alarm is also issued when the DPF inlet temperature is lower than a predetermined value and the amount of collected PM exceeds a set value.

【００２１】次に、ＤＰＦ再生方法について説明する。Next, a DPF regeneration method will be described.

【００２２】上記ディーゼルエンジン１を搭載した車両
が一定距離を走行する毎に、ＤＰＦ再生指令がＥＣＵ２
０からコモンレール式燃料噴射ノズル２のコントローラ
４に発せられる。すると、コントローラ４によって燃料
噴射ノズル２のソレノイド３に通電され、針弁（図示せ
ず）が押し上げられて燃料噴射孔（図示せず）から燃料
がポスト噴射される。Each time a vehicle equipped with the diesel engine 1 travels a certain distance, a DPF regeneration command is issued to the ECU 2
It is issued from 0 to the controller 4 of the common rail type fuel injection nozzle 2. Then, the controller 4 energizes the solenoid 3 of the fuel injection nozzle 2 to push up a needle valve (not shown) and post-inject fuel from a fuel injection hole (not shown).

【００２３】ポスト噴射された燃料が燃焼すると、ディ
ーゼルエンジン１から排出される排ガスの温度が通常よ
り昇温し、ＤＰＦ１１に捕集されているＰＭが燃焼す
る。ＰＭの燃焼によってＤＰＦ１１が再生されると同時
に、ＰＭの燃焼によって排ガス中の酸素が消費され、排
ガス中の酸素濃度が急速に低下し、所定値以下となる
（図４（ｂ）参照）。When the post-injected fuel burns, the temperature of the exhaust gas discharged from the diesel engine 1 rises higher than usual, and the PM trapped in the DPF 11 burns. At the same time as the DPF 11 is regenerated by the combustion of the PM, the oxygen in the exhaust gas is consumed by the combustion of the PM, and the oxygen concentration in the exhaust gas rapidly decreases and becomes lower than a predetermined value (see FIG. 4B).

【００２４】従って、ＤＰＦ１１の出口側に設置した酸
素濃度検出センサー１２によってＤＰＦ１１の再生開始
を正確に確認することができる。Therefore, the start of regeneration of the DPF 11 can be accurately confirmed by the oxygen concentration detection sensor 12 provided on the outlet side of the DPF 11.

【００２５】排ガス中の酸素濃度は、ＤＰＦ１１の出口
側に設置した酸素濃度検出センサー１２によって検出さ
れ、ＥＣＵ２０に入力される。その酸素濃度が所定値以
下に下がった時点でＥＰＵ２０は、ポスト噴射を停止す
る（図４（ａ）参照）。その後は、ＰＭが燃焼する発生
熱のみでＤＰＦ１１の再生が行なわれる。従って、ＤＰ
Ｆ１１が従来の如く異常高温に曝されることが回避され
る。The oxygen concentration in the exhaust gas is detected by an oxygen concentration detection sensor 12 installed on the outlet side of the DPF 11, and is input to the ECU 20. When the oxygen concentration falls below a predetermined value, the EPU 20 stops the post injection (see FIG. 4A). After that, the regeneration of the DPF 11 is performed only by the heat generated by the combustion of the PM. Therefore, DP
F11 is prevented from being exposed to an abnormally high temperature as in the related art.

【００２６】[0026]

【実施例】（実施例）ＤＰＦ出口側の酸素濃度が３％以
下に下がった時点でポスト噴射を停止（図４（ａ）参
照）したところ、ＤＰＦ出口側の温度は、最高でも６８
０℃程度であった（図４（ａ）参照）。その後、ＰＭた
め込み試験時を行なったが、黒煙が出なかった。また、
ＤＰＦの破損も見られなかった。Example (Example) When the post injection was stopped (see FIG. 4A) when the oxygen concentration at the DPF outlet side dropped to 3% or less, the temperature at the DPF outlet side became 68 at the maximum.
It was about 0 ° C. (see FIG. 4A). Thereafter, a PM accumulation test was performed, but no black smoke was emitted. Also,
No DPF was damaged.

【００２７】（比較例）比較のため、ＤＰＦ前後の差圧
が下がった時点でポスト噴射を停止（図５（ａ）参照）
したところ、ＤＰＦ出口側の温度は、１０００℃を超え
た（図５（ａ）参照）。その後、ＰＭため込み試験時に
ＤＰＦが破損し、黒煙が出た。(Comparative Example) For comparison, post injection is stopped when the differential pressure before and after the DPF decreases (see FIG. 5A).
As a result, the temperature on the DPF outlet side exceeded 1000 ° C. (see FIG. 5A). Thereafter, the DPF was damaged during the PM accumulation test and black smoke was emitted.

【００２８】[0028]

【発明の効果】上記のように、本発明によれば、ＤＰＦ
の出口側に設置した酸素濃度検出センサーによってＤＰ
Ｆの出口側における酸素濃度を正確に見極めることが可
能になった。そして、ＤＰＦの出口側における酸素濃度
が設定値（例えば、３％）以下になった時点でポスト噴
射を停止することにより、ＤＰＦが異常高温に曝される
ことが回避され、以てＤＰＦの損傷や溶損を防止するこ
とが可能となった。As described above, according to the present invention, the DPF
By the oxygen concentration detection sensor installed at the exit side of the
It became possible to accurately determine the oxygen concentration at the outlet side of F. By stopping the post-injection when the oxygen concentration at the outlet side of the DPF becomes equal to or lower than a set value (for example, 3%), the DPF is prevented from being exposed to an abnormally high temperature. And erosion can be prevented.

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

【図１】本発明に係る排ガス浄化再生装置の概略図であ
る。FIG. 1 is a schematic diagram of an exhaust gas purification / regeneration apparatus according to the present invention.

【図２】ポスト噴射制御フロー図である。FIG. 2 is a flowchart of post injection control.

【図３】ポスト噴射制御系の模式図である。FIG. 3 is a schematic diagram of a post injection control system.

【図４】酸素濃度の変化でポスト噴射を制御した場合の
試験データの結果を示すチャートであり、（ａ）は各部
温度（℃）と経過時間（分）の関連を示すチャート、
（ｂ）は酸素濃度（％）と経過時間（分）の関連を示す
チャートである。FIG. 4 is a chart showing test data results when post injection is controlled by a change in oxygen concentration, where (a) is a chart showing the relationship between the temperature (° C.) of each part and elapsed time (minutes);
(B) is a chart showing the relationship between oxygen concentration (%) and elapsed time (minutes).

【図５】差圧の変化でポスト噴射を制御した場合の試験
データの結果を示すチャートであり、（ａ）は各部温度
（℃）と経過時間（分）の関連を示すチャート、（ｂ）
は圧力（ｋＰａ）と経過時間（分）の関連を示すチャー
トである。FIGS. 5A and 5B are charts showing test data results when post-injection is controlled by a change in differential pressure; FIG. 5A is a chart showing the relationship between the temperature (° C.) of each part and elapsed time (minutes);
Is a chart showing the relationship between pressure (kPa) and elapsed time (minutes).

【符号の説明】[Explanation of symbols]

１ エンジン １１ パティキュレートフィルタ １２ 酸素濃度検出センサー ２０ ポスト噴射制御装置 DESCRIPTION OF SYMBOLS 1 Engine 11 Particulate filter 12 Oxygen concentration detection sensor 20 Post injection control device

フロントページの続き Ｆターム(参考） 3G090 AA02 CA01 CA04 DA10 DA12 EA02 EA04 3G301 HA02 HA04 HA11 JA24 LB04 MA23 MA26 NA08 PD02Z PD11Z 4D058 JA32 JB06 MA44 MA51 Continued on the front page F term (reference) 3G090 AA02 CA01 CA04 DA10 DA12 EA02 EA04 3G301 HA02 HA04 HA11 JA24 LB04 MA23 MA26 NA08 PD02Z PD11Z 4D058 JA32 JB06 MA44 MA51

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 エンジンの排ガス中に含まれるパティキ
ュレートを捕集するパティキュレートフィルタをポスト
噴射によって再生させるパティキュレートフィルタ再生
方法において、前記パティキュレートフィルタの出口側
の酸素濃度が設定値以下になった時点でポスト噴射を停
止することを特徴とするパティキュレートフィルタ再生
方法。In a particulate filter regeneration method for regenerating a particulate filter for collecting particulates contained in exhaust gas of an engine by post-injection, an oxygen concentration at an outlet side of the particulate filter becomes equal to or less than a set value. A method for regenerating a particulate filter, comprising: stopping post-injection at a point in time. 【請求項２】 エンジンの排ガス中に含まれるパティキ
ュレートを捕集するパティキュレートフィルタをポスト
噴射によって再生させるパティキュレートフィルタ再生
装置において、前記パティキュレートフィルタの出口側
に設けた酸素濃度検出センサーと、該酸素濃度検出セン
サーから入力する酸素濃度が所定値以下になった時点で
ポスト噴射を停止させるポスト噴射制御装置とから成る
パティキュレートフィルタ再生装置。2. A particulate filter regenerating apparatus for regenerating a particulate filter for collecting particulates contained in exhaust gas of an engine by post-injection, comprising: an oxygen concentration detection sensor provided on an outlet side of the particulate filter; And a post-injection control device for stopping post-injection when the oxygen concentration input from the oxygen concentration detection sensor falls below a predetermined value.
JP2001129227A 2001-04-26 2001-04-26 Particulate filter regenerating method and the device Pending JP2002322906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001129227A JP2002322906A (en) 2001-04-26 2001-04-26 Particulate filter regenerating method and the device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001129227A JP2002322906A (en) 2001-04-26 2001-04-26 Particulate filter regenerating method and the device

Publications (1)

Publication Number Publication Date
JP2002322906A true JP2002322906A (en) 2002-11-08

Family

ID=18977785

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001129227A Pending JP2002322906A (en) 2001-04-26 2001-04-26 Particulate filter regenerating method and the device

Country Status (1)

Country Link
JP (1) JP2002322906A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1604726A1 (en) 2004-06-09 2005-12-14 Ngk Insulators, Ltd. Honeycomb filter and method of manufacturing the same
FR2921685A1 (en) * 2007-09-27 2009-04-03 Peugeot Citroen Automobiles Sa Exhaust gas treating method for oil engine of motor vehicle, involves measuring oxygen quantity in exhaust gas upstream of particle filter, and controlling post-combustion fuel injection in line or in cylinders relative to measurement
GB2519165A (en) * 2013-10-14 2015-04-15 Gm Global Tech Operations Inc Method of controlling a late fuel injection in an internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1604726A1 (en) 2004-06-09 2005-12-14 Ngk Insulators, Ltd. Honeycomb filter and method of manufacturing the same
FR2921685A1 (en) * 2007-09-27 2009-04-03 Peugeot Citroen Automobiles Sa Exhaust gas treating method for oil engine of motor vehicle, involves measuring oxygen quantity in exhaust gas upstream of particle filter, and controlling post-combustion fuel injection in line or in cylinders relative to measurement
GB2519165A (en) * 2013-10-14 2015-04-15 Gm Global Tech Operations Inc Method of controlling a late fuel injection in an internal combustion engine

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