JPH04166654A - Catalyst reaction temperature retaining device for methanol engine - Google Patents
Catalyst reaction temperature retaining device for methanol engineInfo
- Publication number
- JPH04166654A JPH04166654A JP2291897A JP29189790A JPH04166654A JP H04166654 A JPH04166654 A JP H04166654A JP 2291897 A JP2291897 A JP 2291897A JP 29189790 A JP29189790 A JP 29189790A JP H04166654 A JPH04166654 A JP H04166654A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- pipe
- exhaust gas
- catalyst
- temperature
- 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
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000003054 catalyst Substances 0.000 title claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 title abstract description 7
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 8
- 238000000746 purification Methods 0.000 claims abstract description 7
- 238000006555 catalytic reaction Methods 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Landscapes
- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はメタノールエンジンに係り、特に、メタノール
エンジンにおける触媒装置の排気ガス温度を触媒反応温
度に幹持するようしたメタノールエンジンの触媒反応温
度保持装宜に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a methanol engine, and in particular, to maintenance of a catalyst reaction temperature in a methanol engine that maintains the exhaust gas temperature of a catalyst device in a methanol engine at a catalyst reaction temperature. It is related to outfitting.
［従来の技術］
近年、軽油、ガソリンなどの燃料の代わりにアルコール
やメタノールなどを使用するエンジンの研究開発がなさ
れている。[Prior Art] In recent years, research and development has been carried out on engines that use alcohol, methanol, etc. instead of fuels such as diesel oil and gasoline.
例えば実開昭５８−１３３７５９６号公報には、アルコ
ールを燃料として使用するエンジンにおいて、低回転・
低負荷運転時あるいは外気温度が低い場合時にアルコー
ルの揮発性が低下して良好な燃焼を得ることができない
という問題に鑑みて、吸気管の上流側にエンジンの冷却
水と熱交換を行う熱交換器を設け、この熱交換器による
吸気加熱を行ってエンジンの燃焼性を改善するという技
術が示されている。For example, Japanese Utility Model Application Publication No. 58-1337596 discloses that in an engine that uses alcohol as fuel,
In view of the problem that during low-load operation or when the outside temperature is low, the volatility of alcohol decreases and good combustion cannot be achieved, so we installed a heat exchanger that exchanges heat with engine cooling water on the upstream side of the intake pipe. A technique has been proposed in which a heat exchanger is installed and the intake air is heated by this heat exchanger to improve the combustibility of the engine.
ところで本出願人等は５４代替え燃料としてメタノール
等の揮発性燃料を使用して排気管内に酸化触媒を設置し
、燃料室内で燃焼し、きれなかった未燃燃料（Ｃｏ等）
を触媒なとで反応させ、未燃燃料を低減するようにして
いた。By the way, the present applicants installed an oxidation catalyst in the exhaust pipe using a volatile fuel such as methanol as a 54 alternative fuel, and burned it in the fuel chamber to remove unburned fuel (such as Co).
was reacted with a catalyst to reduce unburned fuel.
［発明が解決１７ようとする課題］
しかし従来のものではエンジン始動時やアイドリング運
転時の排気温度が低い条件下では触媒温度も触媒反応温
度以下に低下して浄化が困難になり、ＨＣ，Ｃｏが強い
刺激臭として排出されてしまうという問題があった。[17 Problems to be Solved by the Invention] However, in the conventional type, when the exhaust gas temperature is low during engine startup or idling, the catalyst temperature also drops below the catalytic reaction temperature, making purification difficult. There was a problem in that it was emitted as a strong pungent odor.
［課題を解決するための手段］
本発明は上記課題を解決するために、メタノールエンジ
ンの排気管下流に触媒装置を設けると共にその触媒装置
の浄化口と吸気管とを結んでバイパス通路を形成し、こ
のバイパス通路の接続部より上流の吸気管及び上記バイ
パス通路の接続部下流の排気管に、それぞれ排気ガス温
度が触媒温度未満の時に閉作動される絞り弁を設けたも
のである。[Means for Solving the Problems] In order to solve the above problems, the present invention provides a catalyst device downstream of the exhaust pipe of a methanol engine and connects the purification port of the catalyst device with the intake pipe to form a bypass passage. The intake pipe upstream from the bypass passage connection part and the exhaust pipe downstream from the bypass passage connection part are each provided with a throttle valve that is closed when the exhaust gas temperature is lower than the catalyst temperature.
［作用］
暖機時、低負荷時など排気ガス温度が触媒温度未満の時
に絞り弁を作動して吸気管及び排気管を絞ると、新気の
吸入量及び排気の排出量が大巾に゛減少する。このため
、排気圧力の上昇に伴い排気ガスがバイパス通路から吸
気管内へ供給されるようになる。従ってシリンダ内雰囲
気が改善されメタノールの揮発性が改善され、排気ガス
温度が触媒の反応温度まで速やかに回復する。[Function] When the throttle valve is activated to throttle the intake pipe and exhaust pipe when the exhaust gas temperature is below the catalyst temperature, such as during warm-up or low load, the amount of fresh air taken in and the amount of exhaust gas discharged is greatly increased. Decrease. Therefore, as the exhaust pressure increases, exhaust gas is supplied from the bypass passage into the intake pipe. Therefore, the atmosphere inside the cylinder is improved, the volatility of methanol is improved, and the exhaust gas temperature quickly recovers to the reaction temperature of the catalyst.
以下に本発明の好適一実施例を添付図面に基づいて説明
する。A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図には本発明に係るメタノールエンジン１のシステ
ムが示されている。このエンジン１は通常のエンジンと
同様にシリンダ内へ燃焼用の空気を吸入させる吸気管２
と、シリンダ内から排気を排出させるための排気管３と
を有して構成され、排気管３には、排気中のＣＯ，ＨＣ
等を酸化させてＣＯ□、Ｈ２Ｏとして排出させるための
触媒装置４が取付けられている。触媒は一般に使用され
ているプラチナ、パラジウムが用いられている。FIG. 1 shows a system of a methanol engine 1 according to the present invention. This engine 1 has an intake pipe 2 that sucks combustion air into the cylinder like a normal engine.
and an exhaust pipe 3 for discharging exhaust gas from inside the cylinder.
A catalytic device 4 is installed to oxidize and discharge CO□ and H2O. The catalyst used is platinum or palladium, which are commonly used.
触媒装置４の下流には消音装置５が取付けられている。A muffling device 5 is installed downstream of the catalyst device 4.
さて本発明の目的はメタノールエンジン１において暖機
時、低負荷時など排気ガス温度が触媒温度未満の時に、
速やかに排気ガス温度を触媒の反応温度に回復させ保持
することにある。The purpose of the present invention is to, when the methanol engine 1 is warmed up or under low load, when the exhaust gas temperature is lower than the catalyst temperature,
The purpose is to quickly recover and maintain the exhaust gas temperature to the reaction temperature of the catalyst.
そこで本発明では上記触媒装置４の排出口となる浄化口
６と吸気管２の上流側とをバイパス管７により接続して
いる。バイパス管７の接続部よっつ上流側には吸気管を
絞るために第１絞り弁８が設けられ、そして排気管３の
触媒装置４の下流側にはこの排気管３を絞るために第２
絞り弁９が設けられている。これら絞り弁８．９にはこ
れらの絞り度合を調節するためにエア作動式のアクチュ
エータ１０．１１が取付けられている。これらアクチュ
エータ１０．１１の各エアーホース１２゜１３は、その
途中にこれらを開閉するためにそれぞれ第１．第２電磁
弁１４．１５が設けられている。Therefore, in the present invention, the purification port 6 serving as the discharge port of the catalyst device 4 and the upstream side of the intake pipe 2 are connected by a bypass pipe 7. A first throttle valve 8 is provided upstream of the connection part of the bypass pipe 7 to throttle the intake pipe, and a second throttle valve 8 is provided downstream of the catalyst device 4 of the exhaust pipe 3 to throttle the exhaust pipe 3.
A throttle valve 9 is provided. Air-operated actuators 10.11 are attached to these throttle valves 8.9 in order to adjust their degree of restriction. Each of the air hoses 12, 13 of these actuators 10, 11 has a first... A second solenoid valve 14.15 is provided.
本発明にあってこれら第１．第２電磁弁１４゜１５はコ
ントローラ１６の制御部に１ｌｌＪ＃ラインで接続され
ており、コントローラ１６は、触媒装置４の直上流の排
気管３に取付けられた熱電対１７により排気ガスの温度
を実測するように構成されている。In the present invention, these first. The second solenoid valves 14 and 15 are connected to the control section of the controller 16 through a 1llJ# line, and the controller 16 controls the temperature of the exhaust gas using a thermocouple 17 attached to the exhaust pipe 3 immediately upstream of the catalyst device 4. It is configured for actual measurement.
次に本発明のコントローラ１６の制御内容を第２図に基
づいて説明する。Next, the control contents of the controller 16 of the present invention will be explained based on FIG. 2.
上記コントローラ１６はスタート２０を経てまずステッ
プ２１で熱電対１７が故障しているか否かを判断し、故
障していない場合は、ステップ２２に進み、このステッ
プ２２でエンジン１の負荷が低負荷以上であるが否かを
判定する。ステップでエンジンの負荷が低負荷以下であ
ると判断した場合は、ステップ２３に進み熱電対１７に
よる排気温度が触媒反応温度未満かどうかを判定する。After the start 20, the controller 16 first determines whether or not the thermocouple 17 is malfunctioning in step 21. If it is not malfunctioning, the controller 16 proceeds to step 22. It is determined whether or not. If it is determined in step that the engine load is below the low load, the process proceeds to step 23, where it is determined whether the exhaust gas temperature measured by the thermocouple 17 is less than the catalytic reaction temperature.
そしてこのステップ２３において排気温度が触媒反応温
度未満である場合はステップ２４にて第１電磁弁１４及
び第２電磁弁１５を作動して第１較り弁８及び第２較り
弁９による吸気絞りと、排気絞りと行い、排気ガスをバ
イパス管７を介して吸気管２へ戻す吸気・排気絞り（Ｅ
ＧＲ）制御を行う、この結果、シリンダ内雰囲気温度が
上昇してメタノールの揮発性が改善され、燃焼温度が上
昇して排気ガス温度が速やかに触媒反応温度まで上昇す
る。したがって触媒装置４による良好なＨＣ。If the exhaust gas temperature is lower than the catalytic reaction temperature in step 23, the first solenoid valve 14 and the second solenoid valve 15 are operated in step 24, and the intake air is drawn by the first comparison valve 8 and the second comparison valve 9. The intake/exhaust throttle (E
GR) control is performed. As a result, the cylinder internal atmosphere temperature increases, the volatility of methanol is improved, the combustion temperature increases, and the exhaust gas temperature quickly rises to the catalytic reaction temperature. Therefore, good HC by the catalytic device 4.
ＣＯの酸化処理が行われるようになる。またコントロ・
−ラ１６は、低負荷や暖機時にあっても排気温度が触媒
反応温度量Ｆであるような吸気・排気絞り（ＥＧＲ）制
御を必要としない場合には、吸気・排気絞り制御を解除
する（ステップ２５）。この場合は、第１．第２電磁弁
１４゜１５を共に切替えて第１絞り弁８、第２絞り弁９
を開作動し、運転を継続する。CO oxidation treatment begins. Also, the control
-RA 16 cancels the intake/exhaust throttle control when the exhaust gas temperature is equal to the catalytic reaction temperature amount F and the intake/exhaust throttle (EGR) control is not required even during low load or warm-up. (Step 25). In this case, 1. By switching the second solenoid valves 14 and 15 together, the first throttle valve 8 and the second throttle valve 9
Opens and continues operation.
［発明の効果コ
以上説明したことから明らかなように本発明によれば排
気ガス温度を常時触媒装置の触媒反応温度に保持して良
好な排気浄化処理を行わせ、ＨＣ，Ｃｏの排出量を減少
させることができる、という優れた効果を発揮する。[Effects of the Invention] As is clear from the above explanation, according to the present invention, the exhaust gas temperature is constantly maintained at the catalytic reaction temperature of the catalytic device to perform a good exhaust purification process, thereby reducing the amount of HC and Co emissions. It has the excellent effect of reducing
第１図は本発明に係るメタノールエンジンの触媒反応温
度保持装置の好適一実施例を示すシステム図、第２図は
コントローラの好適な制御例を示すフローチャート図で
ある。
図中、１はエンジン、２は吸気管、３は排気管、４は触
媒装置、７はバイパス管、８．９は絞り弁である。
特許出願人 いすず自動車株式会社
代理人弁理士 絹 谷 信 雄
ｆ・・ ／＜４／Ｓ′Ｘτ
Ｂ、？・−・未定 ９４トFIG. 1 is a system diagram showing a preferred embodiment of the catalytic reaction temperature maintaining device for a methanol engine according to the present invention, and FIG. 2 is a flowchart showing a preferred example of control by the controller. In the figure, 1 is an engine, 2 is an intake pipe, 3 is an exhaust pipe, 4 is a catalyst device, 7 is a bypass pipe, and 8.9 is a throttle valve. Patent applicant: Isuzu Motors Co., Ltd. Representative patent attorney: Nobuo Kinutani f... /<4/S'Xτ B,?・-・Undetermined 94t
Claims (1)
ると共にその触媒装置の浄化口と吸気管とを結んでバイ
パス通路を形成し、該通路の接続部より上流の吸気管及
び上記バイパス通路の接続部下流の排気管に、それぞれ
排気ガス温度が触媒温度未満の時に閉作動される絞り弁
を設けたことを特徴とするメタノールエンジンの触媒反
応温度保持装置。1. A catalyst device is provided downstream of the exhaust pipe of the methanol engine, and a bypass passage is formed by connecting the purification port of the catalyst device and the intake pipe, and a connection part between the intake pipe and the bypass passage upstream from the connection part of the passage. A catalytic reaction temperature maintenance device for a methanol engine, characterized in that a downstream exhaust pipe is provided with a throttle valve that is closed when the exhaust gas temperature is lower than the catalyst temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2291897A JPH04166654A (en) | 1990-10-31 | 1990-10-31 | Catalyst reaction temperature retaining device for methanol engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2291897A JPH04166654A (en) | 1990-10-31 | 1990-10-31 | Catalyst reaction temperature retaining device for methanol engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04166654A true JPH04166654A (en) | 1992-06-12 |
Family
ID=17774875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2291897A Pending JPH04166654A (en) | 1990-10-31 | 1990-10-31 | Catalyst reaction temperature retaining device for methanol engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04166654A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008255940A (en) * | 2007-04-06 | 2008-10-23 | Toyota Motor Corp | Exhaust gas recirculation device for internal combustion engine |
-
1990
- 1990-10-31 JP JP2291897A patent/JPH04166654A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008255940A (en) * | 2007-04-06 | 2008-10-23 | Toyota Motor Corp | Exhaust gas recirculation device for internal combustion engine |
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