JPH0625510U - Engine exhaust purification device - Google Patents
Engine exhaust purification deviceInfo
- Publication number
- JPH0625510U JPH0625510U JP6127892U JP6127892U JPH0625510U JP H0625510 U JPH0625510 U JP H0625510U JP 6127892 U JP6127892 U JP 6127892U JP 6127892 U JP6127892 U JP 6127892U JP H0625510 U JPH0625510 U JP H0625510U
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- passage
- engine
- throttle valve
- valve
- 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
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
- Exhaust Gas After Treatment (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
(57)【要約】
【目的】 本考案は、エンジンの排気浄化装置に関し、
アルデヒドの排出を抑制すると共に、早期に加速出力が
出せるようにすることを目的とする。
【構成】 エンジンに空気を供給する吸気通路に吸気絞
り弁を、エンジンからの排気ガスを排除する排気通路の
酸化触媒の下流側に排気絞り弁を設け、排気バルブと酸
化触媒との間と、吸気絞り弁の下流側とを連結する還流
通路に還流バルブを設け、前記酸化触媒に設けた温度セ
ンサからの信号に基づいて、触媒温度が活性化する温度
を基準に、前記各絞り弁及びバルブを切り換える制御手
段を設けた。
(57) [Abstract] [Purpose] The present invention relates to an exhaust emission control device for an engine,
The purpose of the invention is to suppress the discharge of aldehyde and to enable accelerated output at an early stage. An intake throttle valve is provided in an intake passage that supplies air to the engine, and an exhaust throttle valve is provided downstream of an oxidation catalyst in an exhaust passage that removes exhaust gas from the engine, between the exhaust valve and the oxidation catalyst. A recirculation valve is provided in a recirculation passage that connects with a downstream side of the intake throttle valve, and the throttle valve and the valves are each based on a temperature at which the catalyst temperature is activated based on a signal from a temperature sensor provided in the oxidation catalyst. A control means for switching between is provided.
Description
【０００１】[0001]
本考案は、エタノール、メタノール等を燃料とするエンジンの排気ガス中に含 まれる有害物質を除去するために、排気ガスの一部を吸気通路に還流して排気ガ スを浄化するエンジンの排気浄化装置に関する。 In order to remove harmful substances contained in the exhaust gas of an engine that uses ethanol, methanol, etc. as a fuel, the present invention recirculates part of the exhaust gas to the intake passage to purify the exhaust gas of the engine. Purification device
【０００２】[0002]
このようなエンジンの排気還流装置としては、実開昭６３−１２５１６０号公 報に記載されたディーゼル機関の排気ガス再循環制御装置が開示されており、こ の考案は、エンジンの回転速度検出手段と、目標燃料噴射量演算手段と、排気ガ ス再循環演算手段とを有するディーゼルエンジンの排気ガス再循環制御装置にお いて、排気ガス再循環制御弁を、ガード値演算手段と、この演算値と前記排気ガ ス再循環演算手段で演算された再循環量とを比較する比較手段により、制御する ものである。 As an exhaust gas recirculation device for such an engine, an exhaust gas recirculation control device for a diesel engine, which is disclosed in Japanese Utility Model Publication No. 63-125160, is disclosed. In an exhaust gas recirculation control device for a diesel engine having a target fuel injection amount calculation means and an exhaust gas recirculation calculation means, an exhaust gas recirculation control valve is provided with a guard value calculation means and this calculated value. And the recirculation amount calculated by the exhaust gas recirculation calculation means are controlled by the comparison means.
【０００３】 又、実開昭６３−１３０６６０号公報において、触媒温度を検出する検出手段 により、排気還流制御弁を開作動させる内燃機関の排気還流装置が開示されてい る。Further, Japanese Utility Model Laid-Open No. 63-130660 discloses an exhaust gas recirculation system for an internal combustion engine in which an exhaust gas recirculation control valve is opened by a detection means for detecting the catalyst temperature.
【０００４】[0004]
前記公報の前者は、排気ガス中の温度を検出する検出手段が設けられていない ために、燃焼温度が低い場合には排気中に含まれている大量の未燃のメタノール やそれが不完全に酸化されたアルデヒドが排出されるのを阻止することはできず 、アルデヒドの排出が問題となってしまう。 In the former case of the above-mentioned publication, since the detection means for detecting the temperature in the exhaust gas is not provided, when the combustion temperature is low, a large amount of unburned methanol contained in the exhaust gas or incomplete combustion The discharge of the oxidized aldehyde cannot be prevented, and the discharge of the aldehyde becomes a problem.
【０００５】 又、前記公報の後者は、触媒温度を検出する検出手段を備えて、これにより排 気還流制御弁を制御するので、エンジンの低温時のアルデヒド排出の問題は生じ ないものの、エンジンが温まるまでの暖気が遅く、しかも排気バルブがないので 、アルデヒドの一部が還流されずに排出されてしまう問題点があった。Further, the latter of the above-mentioned publication is provided with a detecting means for detecting the catalyst temperature, and controls the exhaust gas recirculation control valve by this, so that the problem of aldehyde emission at low temperature of the engine does not occur, but There was a problem that part of the aldehyde was discharged without being refluxed because the warming up to warm was slow and there was no exhaust valve.
【０００６】 本考案は、従来のエンジンの排気浄化装置における前述の課題を解決するため のもので、アルデヒドの排出を抑制すると共に、早期に加速出力が出せるように することを目的とする。The present invention is intended to solve the above-mentioned problems in the conventional engine exhaust emission control device, and it is an object of the present invention to suppress the discharge of aldehyde and to allow an acceleration output to be output early.
【０００７】[0007]
本考案は、吸気通路を通してエンジンに空気を供給し、排気通路を通してエン ジンからの排気ガスを排除して、排気通路に設けられた酸化触媒により排気ガス を浄化し、排気通路と吸気通路とを連結した還流通路を通して排気ガスを還流す るエンジンの還流装置において、上記還流通路を排気通路の酸化触媒の下流側に 連結し、排気通路の還流通路連結下流側に排気絞り弁を設け、吸気通路の還流通 路連結上流側に吸気絞り弁を設け、還流通路中に還流バルブを設け、前記酸化触 媒に設けた温度センサからの信号に基づいて触媒温度が活性化する温度を基準に 、前記各絞り弁及びバルブを切り換える制御手段を各絞り弁及びバルブに接続し たことを特徴とする。 The present invention supplies air to the engine through the intake passage, removes exhaust gas from the engine through the exhaust passage, and purifies the exhaust gas by the oxidation catalyst provided in the exhaust passage, thereby separating the exhaust passage and the intake passage. In an engine recirculation device that recirculates exhaust gas through a connected recirculation passage, the recirculation passage is connected to the exhaust passage downstream of the oxidation catalyst, and an exhaust throttle valve is provided downstream of the exhaust passage recirculation passage connection. An intake throttle valve is provided on the upstream side of the connection of the recirculation passage, a recirculation valve is provided in the recirculation passage, and the catalyst temperature is activated based on a signal from a temperature sensor provided in the oxidation catalyst. Each throttle valve and control means for switching the valve are connected to each throttle valve and valve.
【０００８】[0008]
本考案のエンジンの排気浄化装置は、触媒温度が活性化温度以下のとき、吸排 気絞り弁を閉じ（半開き）て、還流バルブを開いて還流させれば、アルデヒドを エンジンに吸入させて再燃焼させることができ、このアルデヒドにより燃焼が促 進され、触媒の温度上昇が早められる。 When the catalyst temperature is lower than the activation temperature, the engine exhaust purification system of the present invention closes the intake / exhaust gas throttle valve (half-open) and opens the recirculation valve to recirculate, thereby allowing the aldehyde to be sucked into the engine and reburned. This aldehyde promotes combustion and accelerates the temperature rise of the catalyst.
【０００９】 従って、アルデヒドの排出が抑制され、又早期に加速出力に移行できるもので 、触媒温度が活性化温度以上のときは、還流バルブが閉じられて吸排気絞り弁が 開かれ、所望の加速出力が得られるものである。Therefore, the discharge of aldehyde is suppressed, and the acceleration output can be shifted to an early stage. When the catalyst temperature is equal to or higher than the activation temperature, the reflux valve is closed and the intake / exhaust throttle valve is opened to set the desired value. Acceleration output can be obtained.
【００１０】[0010]
次に、本考案の実施例を図面に付いて、以下に説明する。 この実施例においては、メタノールを燃料とするメタノールエンジンについて 説明するが、エタノールを燃料とするエタノールエンジンについても同様に実施 できるものである。 An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a methanol engine using methanol as a fuel will be described, but an ethanol engine using ethanol as a fuel can be similarly implemented.
【００１１】 このエンジン１に吸気するエアクリーナ２から吸気マニホルド３に至る吸気通 路４中には吸気絞り弁５が設けられ、この吸気通路４の吸気絞り弁５の下流側に は還流通路６が接続されている。An intake throttle valve 5 is provided in an intake passage 4 extending from an air cleaner 2 that intakes to the engine 1 to an intake manifold 3, and a return passage 6 is provided downstream of the intake throttle valve 5 in the intake passage 4. It is connected.
【００１２】 一方、エンジン１の排気ガスを導出する排気マニホルド７には、排気通路８が 接続されており、この排気通路８の下流には酸化触媒９が設置されて、排気の浄 化を行っている。On the other hand, an exhaust passage 8 is connected to an exhaust manifold 7 that guides exhaust gas of the engine 1, and an oxidation catalyst 9 is installed downstream of the exhaust passage 8 to purify the exhaust gas. ing.
【００１３】 この酸化触媒９と排気音を低減する排気マフラ１０との間には排気絞り弁１１ が設けられると共に、酸化触媒９と排気絞り弁１１との間には、前記の還流通路 ６が接続され、この還流通路６中には還流バルブ１２が設置される。An exhaust throttle valve 11 is provided between the oxidation catalyst 9 and the exhaust muffler 10 for reducing exhaust noise, and the above-mentioned recirculation passage 6 is provided between the oxidation catalyst 9 and the exhaust throttle valve 11. A recirculation valve 12 is installed in this recirculation passage 6.
【００１４】 前記酸化触媒９には、その温度を検出する温度センサ１３が設置されて、この 温度センサ１３の検出した温度が入力される制御回路１４は、エアリザーバタン クに接続されて、吸気絞り弁５、排気絞り弁１１、還流バルブ１２を動作させる 各アクチュエータ１５に出力し、吸気絞り弁５、排気絞り弁１１、還流バルブ１ ２の開閉制御を行う。A temperature sensor 13 for detecting the temperature of the oxidation catalyst 9 is installed, and a control circuit 14 to which the temperature detected by the temperature sensor 13 is input is connected to an air reservoir tank to intake air. It outputs to each actuator 15 which operates the throttle valve 5, the exhaust throttle valve 11, and the recirculation valve 12, and performs opening / closing control of the intake throttle valve 5, the exhaust throttle valve 11, and the recirculation valve 12.
【００１５】 この制御回路１４は、図２のフローチャートに従って動作するもので、このプ ログラムがスタートすると、ステップＳ１において、予め設定されている酸化触 媒９の活性化温度Ｔ0 と、温度センサ１３の検出温度Ｔとの比較が行われ、活性 化温度Ｔ0 が入力された検出温度Ｔよりも高い場合には、ステップＳ２に移行し て還流バルブ１２を開く。The control circuit 14 operates in accordance with the flowchart of FIG. 2. When the program starts, in step S 1, the activation temperature T 0 of the oxidation catalyst 9 set in advance and the temperature sensor 13 are set. Is compared with the detected temperature T, and if the activation temperature T 0 is higher than the input detected temperature T, the flow proceeds to step S2 and the reflux valve 12 is opened.
【００１６】 次いで、ステップＳ３に移行して吸気絞り弁５、排気絞り弁１１を閉じ、もし くは半開するが、前記ステップＳ１において、検出温度Ｔが活性化温度Ｔ0 より も高い場合には、ステップＳ４に移行して吸気絞り弁５、排気絞り弁１１を開い た後、ステップＳ５において、還流バルブ１２を閉鎖する。Next, in step S3, the intake throttle valve 5 and the exhaust throttle valve 11 are closed and half-opened. However, in step S1, if the detected temperature T is higher than the activation temperature T 0 , After shifting to step S4 and opening the intake throttle valve 5 and the exhaust throttle valve 11, the recirculation valve 12 is closed in step S5.
【００１７】 そして、ステップＳ３、ステップＳ５の終了後は、ステップＳ１に戻り、前記 を繰り返すものであるが、エンジンの回転の停止時には、このプログラムも終了 する。After steps S3 and S5 are completed, the process returns to step S1 and the above is repeated. However, when the engine rotation is stopped, this program is also completed.
【００１８】 即ち、エンジンの回転に際して酸化触媒９が活性化温度Ｔ0 に達していない場 合には、吸気絞り弁５、排気絞り弁１１が閉鎖、もしくは半開となると共に、還 流バルブ１２が開いて、大量の排気ガスがエンジンに還流されて、排気ガス中に 含まれるアルデヒドが再燃焼されるもので、このアルデヒドにより燃料の燃焼が 促進され、そのために酸化触媒９の温度上昇が早められて、アルデヒドの排出が 抑制される。That is, when the oxidation catalyst 9 does not reach the activation temperature T 0 during engine rotation, the intake throttle valve 5 and the exhaust throttle valve 11 are closed or half-opened, and the return valve 12 is opened. When it opens, a large amount of exhaust gas is recirculated to the engine, and the aldehyde contained in the exhaust gas is recombusted. This aldehyde promotes combustion of the fuel, which accelerates the temperature rise of the oxidation catalyst 9. As a result, the emission of aldehyde is suppressed.
【００１９】 これに対し、酸化触媒９の温度Ｔが活性化温度Ｔ0 よりも高くなった場合には 、吸気絞り弁５、排気絞り弁１１が全開となり、一方還流バルブ１２が閉じるの で、排気の還流は制御され、エンジン１の回転は、早期に加速出力状態に移行す ることができる。On the other hand, when the temperature T of the oxidation catalyst 9 becomes higher than the activation temperature T 0 , the intake throttle valve 5 and the exhaust throttle valve 11 are fully opened, while the recirculation valve 12 is closed. The exhaust gas recirculation is controlled, and the rotation of the engine 1 can transition to the acceleration output state at an early stage.
【００２０】[0020]
以上説明したように本考案は、エンジンの排気ガスを浄化する酸化触媒が活性 化温度に到達する以前は、排気ガスを大量に吸気通路中に還流し、排気ガス中に 含まれるアルデヒドを燃焼させることによってエンジンの燃焼を促進し、酸化触 媒の温度を早期に活性化温度に高め、排気ガス中のアルデヒドの排出を抑制でき る。 As described above, according to the present invention, before the oxidation catalyst for purifying the exhaust gas of the engine reaches the activation temperature, a large amount of the exhaust gas is recirculated into the intake passage to burn the aldehyde contained in the exhaust gas. As a result, combustion of the engine can be promoted, the temperature of the oxidation catalyst can be raised to the activation temperature early, and the emission of aldehyde in the exhaust gas can be suppressed.
【００２１】 そして、酸化触媒の温度が活性化温度に到達後は、排気ガスの還流量を低減し 、定格の加速出力が得られるものである。After the temperature of the oxidation catalyst reaches the activation temperature, the exhaust gas recirculation amount is reduced and a rated acceleration output is obtained.
【図１】本考案の実施例のブロック図である。FIG. 1 is a block diagram of an embodiment of the present invention.
【図２】同上の制御装置のフローチャートである。FIG. 2 is a flowchart of the control device of the above.
１ エンジン ４ 吸気通路 ５ 吸気絞り弁 ６ 還流通路 ８ 排気通路 ９ 酸化触媒 １１ 排気絞り弁 １２ 還流バルブ １３ 温度センサ １４ 制御回路 1 engine 4 intake passage 5 intake throttle valve 6 recirculation passage 8 exhaust passage 9 oxidation catalyst 11 exhaust throttle valve 12 recirculation valve 13 temperature sensor 14 control circuit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｍ 25/07 ５７０ Ｃ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location F02M 25/07 570 C
Claims (1)
し、排気通路を通してエンジンからの排気ガスを排除し
て、排気通路に設けられた酸化触媒により排気ガスを浄
化し、排気通路と吸気通路とを連結した還流通路を通し
て排気ガスを還流するエンジンの還流装置において、上
記還流通路を排気通路の酸化触媒の下流側に連結し、排
気通路の還流通路連結下流側に排気絞り弁を設け、吸気
通路の還流通路連結上流側に吸気絞り弁を設け、還流通
路中に還流バルブを設け、前記酸化触媒に設けた温度セ
ンサからの信号に基づいて触媒温度が活性化する温度を
基準に、前記各絞り弁及びバルブを切り換える制御手段
を各絞り弁及びバルブに接続したことを特徴とするエン
ジンの排気浄化装置。Claim: What is claimed is: 1. Air is supplied to an engine through an intake passage, exhaust gas from the engine is removed through an exhaust passage, and the exhaust gas is purified by an oxidation catalyst provided in the exhaust passage. In an engine recirculation device that recirculates exhaust gas through a connected recirculation passage, the recirculation passage is connected to the exhaust passage downstream of the oxidation catalyst, and an exhaust throttle valve is provided on the exhaust passage recirculation passage connection downstream of the exhaust passage. An intake throttle valve is provided on the upstream side of the connection of the return passage, a return valve is provided in the return passage, and each throttle valve is based on a temperature at which the catalyst temperature is activated based on a signal from a temperature sensor provided on the oxidation catalyst. An exhaust emission control device for an engine, characterized in that control means for switching the valve and the valve are connected to each throttle valve and the valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6127892U JPH0625510U (en) | 1992-08-31 | 1992-08-31 | Engine exhaust purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6127892U JPH0625510U (en) | 1992-08-31 | 1992-08-31 | Engine exhaust purification device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0625510U true JPH0625510U (en) | 1994-04-08 |
Family
ID=13166587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6127892U Pending JPH0625510U (en) | 1992-08-31 | 1992-08-31 | Engine exhaust purification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0625510U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06108927A (en) * | 1992-09-29 | 1994-04-19 | Mitsubishi Motors Corp | Exhaust gas purification device |
| JP2007262954A (en) * | 2006-03-28 | 2007-10-11 | Toyota Motor Corp | Ignition timing control device for compression ignition internal combustion engine |
-
1992
- 1992-08-31 JP JP6127892U patent/JPH0625510U/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06108927A (en) * | 1992-09-29 | 1994-04-19 | Mitsubishi Motors Corp | Exhaust gas purification device |
| JP2007262954A (en) * | 2006-03-28 | 2007-10-11 | Toyota Motor Corp | Ignition timing control device for compression ignition internal combustion engine |
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