JPH04175414A - Exhaust emission control device of diesel engine - Google Patents
Exhaust emission control device of diesel engineInfo
- Publication number
- JPH04175414A JPH04175414A JP2303697A JP30369790A JPH04175414A JP H04175414 A JPH04175414 A JP H04175414A JP 2303697 A JP2303697 A JP 2303697A JP 30369790 A JP30369790 A JP 30369790A JP H04175414 A JPH04175414 A JP H04175414A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- filter means
- exhaust
- shutter valve
- upstream
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 31
- 230000008929 regeneration Effects 0.000 claims abstract description 18
- 238000011069 regeneration method Methods 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 238000000746 purification Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 abstract description 13
- 235000014676 Phragmites communis Nutrition 0.000 abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 230000010349 pulsation Effects 0.000 abstract description 4
- 230000004043 responsiveness Effects 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/027—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/30—Arrangements for supply of additional air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ディーゼルエンジンの排気ガス浄化装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an exhaust gas purification device for a diesel engine.
（従来の技術）
例えば特開昭６１−１１４１４号公報に記載されるよう
に、ディーゼルエンジンの排気通路の一部に設けられ、
排気ガス中のカーボン粒子をトラツブするためのセラミ
ックハニカム製のフィルタ手段を設け、カーボン粒子を
一定量トラップした後、カーボン粒子を燃焼除去し、フ
ィルタ手段の再生を行うものは知られている。(Prior Art) For example, as described in Japanese Unexamined Patent Publication No. 11414/1983, a part of the exhaust passage of a diesel engine is provided with a
It is known to provide a ceramic honeycomb filter means for trapping carbon particles in exhaust gas, trap a certain amount of carbon particles, and then burn and remove the carbon particles to regenerate the filter means.
（発明が解決しようとする課題）
ところで、そのようなフィルタ手段の再生は、停車状態
にて行うものがあるが、再生のための専用の時間が必要
となるし、また、車両走行中に、フィルタ手段の再生を
行う場合には、排気ガス中の酸素不足により再生するこ
とができない領域（低中回転の高負荷域）がある。(Problems to be Solved by the Invention) Incidentally, such regeneration of the filter means may be performed while the vehicle is stopped, but a dedicated time is required for regeneration, and furthermore, while the vehicle is running, When regenerating the filter means, there is a region (high load region at low and medium speeds) in which regeneration cannot be performed due to a lack of oxygen in the exhaust gas.
本発明はかかる点に鑑みてなされたもので、車両走行中
に全ての運転領域でフィルタ手段の再生が可能であるデ
ィーゼルエンジンの排気ガス浄化装置を提供することを
目的とする。The present invention has been made in view of the above problems, and an object of the present invention is to provide an exhaust gas purification device for a diesel engine that is capable of regenerating the filter means in all driving ranges while the vehicle is running.
（課題を解決するための手段）
請求項（１）の発明は、排気通路に配設されカーボン粒
子等のパティキュレートを捕捉するフィルタ手段と、該
フィルタ手段を加熱し捕捉されたパティキュレートを燃
焼除去ザるヒータ手段と、上記フィルタ手段上流の排気
通路に配設された第１シャッター弁とを備え、上記フィ
ルタ手段の再生時に上記第１シャッター弁を閉作動させ
るとともにヒータ・手段にてフィルタ手段を加熱するよ
うにしたディーゼルエンジンの排気ガス浄化装置を前提
とし、上記第１シャッター井上流の排気通路に、外気導
入用の圧力反応弁が配設されている構成とする。(Means for Solving the Problem) The invention of claim (1) includes a filter means disposed in an exhaust passage for capturing particulates such as carbon particles, and a filter means that heats the filter means to burn the captured particulates. and a first shutter valve disposed in the exhaust passage upstream of the filter means, the first shutter valve is closed when the filter means is regenerated, and the heater means removes the filter means. The present invention is based on an exhaust gas purification device for a diesel engine that heats a diesel engine, and is configured such that a pressure reaction valve for introducing outside air is disposed in the exhaust passage upstream of the first shutter well.
請求項（２）の発明は、排気通路の第１シヤ、ンター弁
上流と、フィルタ手段下流とを接続するバイパス通路を
有する。The invention according to claim (2) has a bypass passage that connects the first shear of the exhaust passage, an upstream side of the intervalve, and a downstream side of the filter means.
請求項（３）の発明は、バイパス通路に配設された第２
シャッター弁と、通常運転時に第１シャッター弁を開き
、第２シャッター弁を閉じる一方、フィルタ手段の再生
時に第１シャッター弁を閉じ、第２シャッター弁を開く
制御手段とを有する。The invention of claim (3) provides a second
It has a shutter valve and control means that opens the first shutter valve and closes the second shutter valve during normal operation, while closing the first shutter valve and opening the second shutter valve during regeneration of the filter means.
請求項（４）の発明は、圧力反応弁が、バイパス通路の
上流側分岐部より上流側の排気通路に配設されている。In the invention according to claim (4), the pressure reaction valve is disposed in the exhaust passage upstream of the upstream branch of the bypass passage.
（作用）
請求項（１）の発明によれば、第１シャッター弁上流の
排気通路に、外気導入用の圧力反応弁が配設されている
ので、酸素不足になりやすい低中回転の高負荷域では、
排気脈動が大きいことから、圧力反応弁により２次エア
が導入され、酸素不足が解消される。(Function) According to the invention of claim (1), since the pressure reaction valve for introducing outside air is disposed in the exhaust passage upstream of the first shutter valve, high load at low and medium speeds where oxygen is likely to be insufficient is provided. In the area,
Since the exhaust pulsation is large, secondary air is introduced by the pressure reaction valve to eliminate the oxygen shortage.
請求項（２）の発明によれば、排気通路に、フィルタ手
段をバイパスするバイパス通路を設けたので、車両走行
時にフィルタ手段の再生のために第１排気シャッター弁
を閉じても、排気抵抗は高まらない。According to the invention of claim (2), since the exhaust passage is provided with a bypass passage that bypasses the filter means, the exhaust resistance is reduced even when the first exhaust shutter valve is closed to regenerate the filter means when the vehicle is running. It doesn't increase.
請求項（３）の発明によれば、通常運転時に第１シャッ
ター弁を開き、第２シャッター弁を閉じる一方、フィル
タ手段の再生時に第１シャッター弁を閉じ、第２シャッ
ター弁を開くように制御され、それによって通常運転時
にはパティキュレートがフィルタ手段によって確実に捕
捉され、再生時には、バイパス通路を通じて排気ガスが
流れ、排気抵抗を高めることなく、フィルタ手段の再生
が行われる。According to the invention of claim (3), the first shutter valve is opened and the second shutter valve is closed during normal operation, and the first shutter valve is controlled to be closed and the second shutter valve is opened during regeneration of the filter means. As a result, particulates are reliably captured by the filter means during normal operation, and during regeneration, exhaust gas flows through the bypass passage, and the filter means is regenerated without increasing exhaust resistance.
請求項（４）の発明によれば、圧力反応弁か上流側分岐
部の上流に配設されているので、上流側分岐部が拡大室
となって、圧力反転による弁応答性が向上する。According to the invention of claim (4), since the pressure-responsive valve is disposed upstream of the upstream branch, the upstream branch becomes an enlarged chamber, and the valve responsiveness due to pressure reversal is improved.
（実施例） 以下、本発明の実施例を図面に沿って詳細に説明する。(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.
全体構成を示す第１図において、１は４気筒のディーゼ
ルエンジンで、各気筒に吸気通路２及び排気通路３が接
続されている。In FIG. 1 showing the overall configuration, 1 is a four-cylinder diesel engine, and each cylinder is connected to an intake passage 2 and an exhaust passage 3.
排気通路３の途中には、排気ガス中のカーボン粒子を捕
捉するためのセラミックハニカム製のフィルタ手段４が
介設され、その上下流に第１及び第２圧カセンサ５．６
が配設されている。第１圧カセンサ５の上流側に第１シ
ャッター弁７が配設されている。また、第１シャッター
弁７の上流側に、外気導入用の圧力反応弁としてのリー
ド弁８が配設されている。このリード弁８は、耐熱性に
優れ、かつ大気圧に近い負圧で作動する応答性のよいも
のである。A filter means 4 made of ceramic honeycomb for capturing carbon particles in the exhaust gas is interposed in the middle of the exhaust passage 3, and first and second pressure sensors 5, 6 are installed upstream and downstream thereof.
is installed. A first shutter valve 7 is disposed upstream of the first pressure sensor 5. Further, on the upstream side of the first shutter valve 7, a reed valve 8 is provided as a pressure-responsive valve for introducing outside air. This reed valve 8 has excellent heat resistance and has good responsiveness because it operates at a negative pressure close to atmospheric pressure.
第１シャッター弁７は、アクチュエータ１１にて開閉さ
れるようになっており、該アクチュエータ１１は、コン
トロールユニット１２によってデユーティ制御される第
１デユーテイソレノイド弁１３を介してバキュームポン
プ１４に接続されている。The first shutter valve 7 is opened and closed by an actuator 11, and the actuator 11 is connected to a vacuum pump 14 via a first duty solenoid valve 13 that is duty-controlled by a control unit 12. ing.
また、上記排気通路３には、第１シャッター弁７の上流
側と、第２圧カセンサ６の下流側とを接続するバイパス
通路１５が設けられている。このバイパス通路１５には
、第２シャッター弁１６が配設されている。Further, the exhaust passage 3 is provided with a bypass passage 15 that connects the upstream side of the first shutter valve 7 and the downstream side of the second pressure sensor 6. A second shutter valve 16 is provided in this bypass passage 15 .
第２シャッター弁１６も、第１シャッター弁７と同様に
、アクチュエータ１７にて開閉されるようになっており
、該アクチュエータ１７は、コントロールユニット１２
によってデユーティ制御される第２デユーテイソレノイ
ド弁１８を介してバキュームポンプ１４に接続されてい
る。Like the first shutter valve 7, the second shutter valve 16 is also opened and closed by an actuator 17, and the actuator 17 is connected to the control unit 12.
The vacuum pump 14 is connected to the vacuum pump 14 via a second duty solenoid valve 18 which is duty-controlled by the vacuum pump 14.
２１はフィルタ手段４１三設けられフィルタ手段４の再
生時に通電加熱される排気ヒータ、２２は排気ヒータ２
１の温度を検出する温度センサである。２３は燃料噴射
ポンプ、２４．２５は燃料噴射ポンプ２３に連係されエ
ンジン回転数及び負荷を検出する回転数センサ及び負荷
センサ、２６はエアクリーナである。21 is an exhaust heater provided with filter means 41 and heated by electricity during regeneration of the filter means 4; 22 is an exhaust heater 2;
This is a temperature sensor that detects the temperature of 1. 23 is a fuel injection pump, 24, 25 is a rotation speed sensor and a load sensor that are linked to the fuel injection pump 23 and detects the engine rotation speed and load, and 26 is an air cleaner.
上記コントロールユニット１２は、圧力センサ５．６よ
りの出力を受はフィルタ手段４の目詰まりを検出する目
詰まり検出手段１２Ａと、該目詰まり検出手段１２Ａ並
びに回転数センサ２４及び負荷センサ２５の出力を受け
それらに応じて第１及び第２デューテイソレノイ、ド弁
１３，１８をデユーティ制御し、第１及び第２シャッタ
ー弁７゜１６を開閉制御する弁制御手段１２Ｂと、上記
目詰まり検出手段１２Ａの出力を受は排気ヒータ２１を
作動させるヒータ制御手段１２Ｃとを有する。The control unit 12 includes a clogging detection means 12A that receives the output from the pressure sensor 5.6 and detects clogging of the filter means 4, and outputs of the clogging detection means 12A, the rotation speed sensor 24, and the load sensor 25. and a valve control means 12B for duty-controlling the first and second duty solenoids and the shutter valves 13 and 18 according to the received signals, and controlling the opening and closing of the first and second shutter valves 7.16; The heater control means 12C receives the output of the means 12A and operates the exhaust heater 21.
また、該弁制御手段１２Ｂは、アクチュエータ１１．１
７よりの信号を受け、第１及び第２シャッター弁７．１
６の開度が目標値になるように補正するようになってい
る。Further, the valve control means 12B controls the actuator 11.1.
7, the first and second shutter valves 7.1
The opening degree of No. 6 is corrected so that it becomes the target value.
続いて、上記コントロールユニット１２による処理の流
れについて説明する。Next, the flow of processing by the control unit 12 will be explained.
スタートすると、まず、第１及び第２圧カセンサ５，６
よりの出力信号を受け、それらの圧力差ＰＬ−Ｐ２が一
定値ΔＰ以上であるか否かすなわちフィルタ手段４前後
の圧力差が一定値以上であるか否かを判定する（ステッ
プＳｌ）。When started, the first and second pressure sensors 5, 6
It is determined whether the pressure difference PL-P2 between them is greater than or equal to a certain value ΔP, that is, whether the pressure difference before and after the filter means 4 is greater than or equal to a certain value (step Sl).
一定値６２以上であれば、フィルタ手段４が目詰まりを
起こしておりフィルタ手段４の再生が必要であると考え
られるので、排気ヒータ２１の昇温効率向上のために、
第１シャッター弁７を閉じ、第２シャッター弁１６を開
き（ステップＳ２）、排気ヒータ２１に通電する（ステ
ップＳ３）。−方、フィルタ手段４前後の圧力差が一定
値以上でなければ、フィルタ手段４の目詰まりがなく再
生の必要がないと考えられるので、ステップＳＬの判定
を繰り返す。If the constant value is 62 or more, it is considered that the filter means 4 is clogged and needs to be regenerated. Therefore, in order to improve the temperature raising efficiency of the exhaust heater 21,
The first shutter valve 7 is closed, the second shutter valve 16 is opened (step S2), and the exhaust heater 21 is energized (step S3). - On the other hand, if the pressure difference before and after the filter means 4 is not above a certain value, it is considered that the filter means 4 is not clogged and there is no need for regeneration, so the determination in step SL is repeated.
ステップＳ３で排気ヒータ２１に通電した後、排気ヒー
タ２１のヒータ温度Ｔが一定値ＴＯ以上であるか否かを
判定する（ステップＳ４）。After energizing the exhaust heater 21 in step S3, it is determined whether the heater temperature T of the exhaust heater 21 is equal to or higher than a certain value TO (step S4).
上記排気ヒータ２１のヒータ温度が一定値以上であれば
、直ちに再生を開始することができるので、エンジン回
転数、エンジン負荷を検出し、それに応じて予め設定さ
れている目標弁開度に、実際の弁開度が一致するように
デユーティ比を補正しつつ、第１及び第２デユーテイソ
レノイド弁１３．１８をデユーティ制御する（ステップ
５５）一方、上記排気ヒータ２１のヒータ温度が一定値
以上でなければ、排気ヒータ２１の温度が昇温しで一定
値以上となるまでステップＳ４の判定を繰り返し、再生
の開始を遅らせる。If the heater temperature of the exhaust heater 21 is above a certain value, regeneration can be started immediately, so the engine speed and engine load are detected and the actual valve opening is adjusted to the preset target valve opening accordingly. The first and second duty solenoid valves 13, 18 are duty-controlled while correcting the duty ratio so that the valve openings of the valves match (step 55). If not, the determination in step S4 is repeated until the temperature of the exhaust heater 21 rises to a certain value or higher, and the start of regeneration is delayed.
その後、第１及び第２圧カセンサ５，６よりの出力信号
を受け、それらの圧力差Ｐｉ−Ｐ２が一定値ΔＰ以下で
あるか否かすなわちフィルタ手段４前後の圧力差が一定
値以下であるか否かを再び判定する（ステップＳｌ）。Thereafter, output signals from the first and second pressure sensors 5, 6 are received, and it is determined whether the pressure difference Pi-P2 between them is less than a certain value ΔP, that is, the pressure difference before and after the filter means 4 is less than a certain value. It is determined again whether or not (step Sl).
フィルタ手段４前後の圧力差が一定値以下であれば、フ
ィルタ手段４の目詰まりは解消されたと考えられるので
、排気ヒータ２１への通電を解除して、フィルタ手段４
の再生を終了する。一方、フィルタ手段４前後の圧力差
が一定値以下でなければ、依然としてフィルタ手段４の
目詰まりはあると考えられるので、フィルタ手段４前後
の圧力差が一定値以下となるまで、ステップＳ５のデユ
ーティ制御を繰り返す。If the pressure difference before and after the filter means 4 is below a certain value, it is considered that the filter means 4 is not clogged, so the exhaust heater 21 is de-energized and the filter means 4 is
End playback. On the other hand, if the pressure difference across the filter means 4 is not below a certain value, it is considered that the filter means 4 is still clogged. Repeat control.
なお、フィルタ手段４の再生時以外の通常運転時には、
第１シャッター弁７は全開で、第２シャッター弁１６は
全閉となり、排気ガス中のカーボン粒子等のパティキュ
レートはフィルタ手段４に捕捉される。Note that during normal operation other than when the filter means 4 is regenerated,
The first shutter valve 7 is fully open, the second shutter valve 16 is fully closed, and particulates such as carbon particles in the exhaust gas are captured by the filter means 4.
上記のように構成すれば、通常運転時に第１シャッター
弁７を開き、第２シャッター弁１６を閉じる一方、フィ
ルタ手段４の再生時に第１シャッター弁７を閉じ、第２
シャッター弁１６を開くようにしているので、通常運転
時にはパティキュレートがフィルタ手段４によって確実
に捕捉され、再生時には、バイパス通路１５を通じて排
気ガスが流れるので、排気抵抗を高めることな（、フィ
ルタ手段４の再生が行われる。With the above configuration, the first shutter valve 7 is opened and the second shutter valve 16 is closed during normal operation, while the first shutter valve 7 is closed and the second shutter valve 7 is closed during regeneration of the filter means 4.
Since the shutter valve 16 is opened, particulates are reliably captured by the filter means 4 during normal operation, and during regeneration, exhaust gas flows through the bypass passage 15, so that the exhaust gas is not increased (the filter means 4 is played.
また、低中回転の高負荷域では、酸素不足となり、排気
ヒータ２１への通電のみではパティキュレートが燃焼し
にくい領域であるが、フィルタ手段４の上流にリード弁
８が配設されているので、排気脈動が大きいことから、
２次エアが導入され、酸素不足は解消される。Furthermore, in the high load range of low and medium rotations, there is a lack of oxygen, and particulates are difficult to burn simply by energizing the exhaust heater 21, but since the reed valve 8 is disposed upstream of the filter means 4, , due to the large exhaust pulsation,
Secondary air is introduced and the oxygen shortage is resolved.
上記実施例では、リード弁８をバイパス通路１５の上流
側分岐部の下流に配設しているが、リード弁８Ａを、第
１図に鎖線で示すように、バイパス通路１５の上流側分
岐部の上流に配設するようにしてもよい。そのようにす
れば、バイパス通路１５の上流側分岐部が拡大室となっ
て、圧力反転による弁応答性が向上する。In the above embodiment, the reed valve 8 is disposed downstream of the upstream branch of the bypass passage 15, but the reed valve 8A is disposed at the upstream branch of the bypass passage 15, as shown by the chain line in FIG. It may be arranged upstream of the . In this way, the upstream branch of the bypass passage 15 becomes an enlarged chamber, and the valve responsiveness due to pressure reversal is improved.
（発明の効果）
請求項（１）の発明は、１シャッター弁上流の排気通路
に、外気導入用の圧力反応弁が配設されているので、再
生のための特別のエア供給機構を設けることなく、エア
の供給が図れる。(Effect of the invention) The invention of claim (1) has a pressure reaction valve for introducing outside air arranged in the exhaust passage upstream of the first shutter valve, so a special air supply mechanism for regeneration is provided. Air can be supplied without any problems.
請求項（２）の発明は、バイパス通路を設けたので、排
気抵抗を低減することができる。In the invention of claim (2), since the bypass passage is provided, exhaust resistance can be reduced.
請求項（３）の発明は、通常運転時に第１シャッター弁
を開き、第２シャッター弁を閉じる一方、フィルタ手段
の再生時に第１シャッター弁を閉じ、第２シャッター弁
を開くようにしたので、通常運転時にはパティキュレー
トがフィルタ手段によって確実に捕捉され、再生時には
バイパス通路を通じて排気ガスが流れることとなり、そ
れによって排気抵抗を高めることなく、フィルタ手段の
再生が行われる。In the invention of claim (3), the first shutter valve is opened and the second shutter valve is closed during normal operation, while the first shutter valve is closed and the second shutter valve is opened during regeneration of the filter means. During normal operation, particulates are reliably captured by the filter means, and during regeneration, exhaust gas flows through the bypass passage, thereby regenerating the filter means without increasing exhaust resistance.
請求項（４）の発明は、圧力反応弁を分岐部上流に配設
したので、圧力反転による弁応答性が向上する。In the invention of claim (4), since the pressure-responsive valve is disposed upstream of the branch portion, the valve responsiveness due to pressure reversal is improved.
図面は本発明の実施例を示し、第１図はディーゼルエン
ジンの排気ガス浄化装置の全体構成図、第２図はコント
ロールユニットのブロック図、第３図はコントロールユ
ニットの処理の流れを示す流れ図である。
■・・・・・・ディーゼルエンジン
２・・・・・・排気通路
４・・・・・・フィルタ部材（フィルタ手段）５．６・
・・・・・圧力センサ
７・・・・・・第１シャッター弁
８・・・・・・リード弁（圧力反応弁）１２・・・・・
・コントロールユニット（制御手段）１５・・・・・・
バイパス通路
１６・・・・・・第２シャッター弁
２Ｉ・・・・・・排気ヒータ（ヒータ手段）第３図The drawings show an embodiment of the present invention, in which Fig. 1 is an overall configuration diagram of an exhaust gas purification device for a diesel engine, Fig. 2 is a block diagram of a control unit, and Fig. 3 is a flowchart showing the processing flow of the control unit. be. ■... Diesel engine 2... Exhaust passage 4... Filter member (filter means) 5.6.
...Pressure sensor 7 ...First shutter valve 8 ...Reed valve (pressure reaction valve) 12 ...
・Control unit (control means) 15...
Bypass passage 16...Second shutter valve 2I...Exhaust heater (heater means) Fig. 3
Claims (4)
ュレートを捕捉するフィルタ手段と、該フィルタ手段を
加熱し捕捉されたパティキュレートを燃焼除去するヒー
タ手段と、上記フィルタ手段上流の排気通路に配設され
た第１シャッター弁とを備え、上記フィルタ手段の再生
時に上記第１シャッター弁を閉作動させるとともにヒー
タ手段にてフィルタ手段を加熱するようにしたものにお
いて、 上記第１シャッター弁上流の排気通路に、外気導入用の
圧力反応弁が配設されていることを特徴とするディーゼ
ルエンジン排気ガス浄化装置。(1) A filter means arranged in the exhaust passage to capture particulates such as carbon particles, a heater means arranged in the exhaust passage upstream of the filter means to heat the filter means and burn off the captured particulates. a first shutter valve provided therein, the first shutter valve is closed when the filter means is regenerated, and the filter means is heated by a heater means, the exhaust gas upstream of the first shutter valve; A diesel engine exhaust gas purification device characterized in that a pressure reaction valve for introducing outside air is disposed in a passage.
手段下流とを接続するバイパス通路を有するところの請
求項（１）記載のディーゼルエンジンの排気ガス浄化装
置。(2) The exhaust gas purification device for a diesel engine according to claim (1), further comprising a bypass passage connecting the exhaust passage upstream of the first shutter valve and downstream of the filter means.
、通常運転時に第１シャッター弁を開き、第２シャッタ
ー弁を閉じる一方、フィルタ手段の再生時に第１シャッ
ター弁を閉じ、第２シャッター弁を開く弁制御手段とを
有するところの請求項（２）記載のディーゼルエンジン
の排気ガス浄化装置。(3) a second shutter valve disposed in the bypass passage; the first shutter valve is opened during normal operation and the second shutter valve is closed; while the first shutter valve is closed during regeneration of the filter means and the second shutter valve is closed; The exhaust gas purification device for a diesel engine according to claim 2, further comprising valve control means for opening the valve.
り上流側の排気通路に配設されているところの請求項（
２）記載のディーゼルエンジンの排気ガス浄化装置。(4) The pressure-responsive valve is disposed in the exhaust passage upstream of the upstream branch of the bypass passage (
2) Exhaust gas purification device for a diesel engine as described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2303697A JPH04175414A (en) | 1990-11-07 | 1990-11-07 | Exhaust emission control device of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2303697A JPH04175414A (en) | 1990-11-07 | 1990-11-07 | Exhaust emission control device of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04175414A true JPH04175414A (en) | 1992-06-23 |
Family
ID=17924157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2303697A Pending JPH04175414A (en) | 1990-11-07 | 1990-11-07 | Exhaust emission control device of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04175414A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330591A (en) * | 2011-06-21 | 2012-01-25 | 高玉琴 | Diesel engine exhaust filter regeneration point measuring device and measuring method |
| CN102840020A (en) * | 2011-06-21 | 2012-12-26 | 高玉琴 | Measuring device for regeneration point of diesel engine exhaust filter |
-
1990
- 1990-11-07 JP JP2303697A patent/JPH04175414A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330591A (en) * | 2011-06-21 | 2012-01-25 | 高玉琴 | Diesel engine exhaust filter regeneration point measuring device and measuring method |
| CN102840020A (en) * | 2011-06-21 | 2012-12-26 | 高玉琴 | Measuring device for regeneration point of diesel engine exhaust filter |
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