JP2008232089A - Exhaust emission control system - Google Patents

Exhaust emission control system Download PDF

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JP2008232089A
JP2008232089A JP2007075925A JP2007075925A JP2008232089A JP 2008232089 A JP2008232089 A JP 2008232089A JP 2007075925 A JP2007075925 A JP 2007075925A JP 2007075925 A JP2007075925 A JP 2007075925A JP 2008232089 A JP2008232089 A JP 2008232089A
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reducing agent
exhaust
blower
vehicle
engine
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JP4845041B2 (en
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Hiroyuki Tachikawa
弘幸 立川
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UD Trucks Corp
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    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control system not requiring any change of the layout of a reducer adding device even if export to a region where temperature is high is considered. <P>SOLUTION: The exhaust emission control system is provided with the reducer adding device 28 supplying reducer to a nozzle injecting reducer to an exhaust gas upstream of a reduction catalyst provided in an engine exhaust pipe of a vehicle according to an engine operation condition. The system is characterized by including a blower 40 for cooling the reducer adding device 28 and a temperature switch 42 controlling the blower 40 based on ambient temperature of a vicinity of the engine. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、還元剤を用いて排気中の窒素酸化物（ＮＯｘ）を還元除去する排気浄化装置に関する。   The present invention relates to an exhaust emission control device that uses a reducing agent to reduce and remove nitrogen oxides (NOx) in exhaust gas.

エンジン排気中のＮＯｘを除去する触媒浄化システムとして、特許文献１に記載された排気浄化装置が提案されている。この排気浄化装置は、エンジン排気管に配設された還元触媒の排気上流に、エンジン運転状態に応じた還元剤を噴射供給することで、排気中のＮＯｘと還元剤とを触媒還元反応させて、ＮＯｘを無害成分に浄化処理するものである。ここで、還元反応は、ＮＯｘと反応性が良好なアンモニアを用いるもので、還元剤としては、排気熱及び排気中の水蒸気により加水分解してアンモニアを発生する尿素水溶液が用いられる。
特開２０００−２７６２７号公報 As a catalyst purification system for removing NOx in engine exhaust, an exhaust purification device described in Patent Document 1 has been proposed. This exhaust purification device causes a catalytic reduction reaction between NOx in the exhaust and the reducing agent by injecting and supplying a reducing agent according to the engine operating state upstream of the reduction catalyst disposed in the engine exhaust pipe. , NOx is purified to harmless components. Here, the reduction reaction uses ammonia having good reactivity with NOx, and as the reducing agent, an aqueous urea solution that generates ammonia by hydrolysis with exhaust heat and water vapor in the exhaust is used.
JP 2000-27627 A

上記の排気浄化装置においては、還元触媒より排気上流の排気管に、還元剤を噴射するノズルが設けられており、エンジン運転状態に応じた還元剤をそのノズルに供給するポンプを備えた還元剤添加装置が使用される。この還元剤添加装置にはＥＣＵ（電子制御ユニット）が搭載されているので、設置位置における雰囲気温度に上限がある。このため、たとえば我国において問題ないレイアウトを設計してあっても、熱帯などの気温が高い地域では雰囲気温度が上限を上回る可能性が考えられ、この場合には、当該地域向けにレイアウトを見直す必要が出てくる。しかし、地域ごとにエンジン周りのレイアウトが違うのは、生産性やコストの点で好ましくない。   In the above exhaust purification device, a nozzle for injecting a reducing agent is provided in an exhaust pipe upstream of the reduction catalyst, and the reducing agent includes a pump for supplying a reducing agent corresponding to the engine operating state to the nozzle. An adder is used. Since this reducing agent addition apparatus is equipped with an ECU (electronic control unit), there is an upper limit to the ambient temperature at the installation position. For this reason, for example, even if a layout that has no problem in Japan is designed, it is possible that the ambient temperature may exceed the upper limit in areas with high temperatures such as the tropics. In this case, it is necessary to review the layout for the area. Comes out. However, it is not preferable in terms of productivity and cost that the layout around the engine is different in each region.

そこで本発明は、気温の高い地域への輸出が考えられるような場合でもレイアウトを見直さずに済ませられるような排気浄化装置を提案するものである。   In view of this, the present invention proposes an exhaust emission control device that does not require a review of the layout even when export to an area with a high temperature is considered.

本発明によれば、車両のエンジン排気管に配設された還元触媒と、該還元触媒の排気上流へ還元剤を噴射するノズルと、エンジン運転状態に応じた還元剤を前記ノズルに供給する還元剤添加装置と、前記還元剤添加装置を冷却するための送風器と、エンジン近傍の雰囲気温度に基づいて前記送風器を制御する温度スイッチと、を含んだ構成とすることを特徴とする。   According to the present invention, the reduction catalyst disposed in the engine exhaust pipe of the vehicle, the nozzle that injects the reducing agent upstream of the exhaust of the reduction catalyst, and the reduction that supplies the reducing agent according to the engine operating state to the nozzle. And a temperature switch for controlling the air blower based on an ambient temperature in the vicinity of the engine.

その送風器は、前記還元剤添加装置に対し、車両後方の斜め上から送風する位置に設置されることが好ましい。また、前記還元剤添加装置よりも車両前方に離間させて、略垂直に立てた防風板を設置し、該防風板の前記還元剤添加装置よりも車両上方に突出する部分を車両後方へ向けて傾斜させる、あるいは、前記還元剤添加装置よりも車両下方に離間させて、略水平に寝かせた導風板を設置し、該導風板の前記還元剤添加装置よりも車両後方に突出する部分を車両上方へ向けて傾斜させるようにしてもよい。   The blower is preferably installed at a position where air is blown obliquely from the rear of the vehicle with respect to the reducing agent adding device. In addition, a windshield plate is installed that is separated from the reducing agent addition device in front of the vehicle and is substantially vertical, and a portion of the windproof plate that protrudes above the reducing agent addition device is directed toward the rear of the vehicle. An air guide plate that is inclined or spaced apart from the reducing agent adding device below the vehicle and laid down substantially horizontally is installed, and a portion of the air guiding plate that protrudes rearward of the reducing agent adding device is provided. You may make it incline toward the vehicle upper direction.

温度スイッチについては、エンジンの排気マニホールド近傍に設置するのが好ましい。   The temperature switch is preferably installed near the exhaust manifold of the engine.

本発明の排気浄化装置によれば、温度スイッチに従って自動的に始動／停止する送風器を用いた空冷方式を還元剤添加装置に対し採用し、雰囲気温度が上限に達するほどに上昇する場合には自動的に送風器を動作させて、温度上昇を抑制することができる。したがって、上限温度を超えるほどの温度上昇が起こりにくくなっているので、地域ごとにレイアウトを見直さずに済み、工数削減、コスト抑制という効果を得られる。   According to the exhaust emission control device of the present invention, when an air cooling method using a blower that automatically starts / stops according to a temperature switch is adopted for a reducing agent addition device, the ambient temperature rises to an upper limit. The blower can be automatically operated to suppress the temperature rise. Therefore, since the temperature rise is difficult to occur so as to exceed the upper limit temperature, it is not necessary to review the layout for each region, and the effects of reducing man-hours and cost can be obtained.

特に、送風器を、車両後方の斜め上から送風する位置に設置すると、車両走行中にラジエータを通して前方から流れてくる熱風を抑えて、後方から比較的温度の低い風を送風することができるので、還元剤添加装置の上面温度上昇を抑制する効果が高くなる。
また、還元剤添加装置の車両前方に防風板を設置すれば、還元剤添加装置前面に対し、車両走行中にラジエータを通して流れてくる熱風があたらないようにする風除けになる。加えて、該防風板の還元剤添加装置よりも車両上方に突出する部分を車両後方へ向けて傾斜させてあると、送風器による風を、防風板と還元剤添加装置との間を通過するように導風することができる。これにより、比較的温度の低い空気の層を防風板と還元剤添加装置との間に形成することができるので、冷却効果を高めることが可能である。 In particular, if the blower is installed at a position where air is blown obliquely from the rear of the vehicle, hot air flowing from the front through the radiator can be suppressed while the vehicle is running, so that relatively cool air can be blown from the rear. And the effect which suppresses the upper surface temperature rise of a reducing agent addition apparatus becomes high.
In addition, if a windbreak plate is installed in front of the reducing agent addition device in the vehicle, the front surface of the reducing agent addition device can be prevented from being exposed to the hot air flowing through the radiator while the vehicle is running. In addition, if the portion of the windshield that protrudes above the reducing agent addition device is inclined toward the rear of the vehicle, the wind from the blower passes between the windbreak plate and the reducing agent addition device. Can be guided. Thereby, since a layer of air having a relatively low temperature can be formed between the windbreak plate and the reducing agent adding device, the cooling effect can be enhanced.

さらに、還元剤添加装置の車両下方に導風板を設置し、該導風板の還元剤添加装置よりも車両後方に突出する部分を車両上方へ向けて傾斜させておくと、送風器による風を、導風板と還元剤添加装置との間を通過するように導風することができる。これにより、比較的温度の低い空気の層を導風板と還元剤添加装置との間に形成することができるので、還元剤添加装置の下方に存在し得る熱源からの影響を抑制し、冷却効果を高めることが可能である。   Furthermore, if a wind guide plate is installed below the reducing agent addition device and the portion of the wind guide plate that protrudes rearward of the reducing agent addition device is inclined toward the vehicle upper direction, Can be guided to pass between the air guide plate and the reducing agent adding device. As a result, a layer of air having a relatively low temperature can be formed between the air guide plate and the reducing agent adding device, so that the influence from the heat source that may exist below the reducing agent adding device is suppressed and cooling is performed. It is possible to increase the effect.

このような送風器を制御する温度スイッチは、より温度の高い排気マニホールド近傍に設置しておくと、雰囲気温度の上昇に対する温度スイッチのレスポンスの遅れを吸収することができ、送風器を始動させる温度をより正確に制御することができる。   If a temperature switch for controlling such a blower is installed in the vicinity of a higher temperature exhaust manifold, it can absorb the delay in the response of the temperature switch to the rise in ambient temperature, and the temperature at which the blower is started. Can be controlled more accurately.

図１は、尿素水溶液を還元剤前駆体として使用し、エンジン排気中に含まれるＮＯｘを触媒還元反応により浄化する排気浄化装置の全体構成を示す。
エンジン１０の排気マニフォールド１２に接続される排気管１４には、排気流通方向に沿って、一酸化窒素（ＮＯ）を二酸化窒素（ＮＯ２）へと酸化させる窒素酸化触媒１６と、尿素水溶液を噴射供給する噴射ノズル１８と、尿素水溶液を加水分解して得られるアンモニアによりＮＯｘを還元浄化するＮＯｘ還元触媒２０と、ＮＯｘ還元触媒２０を通過したアンモニアを酸化させるアンモニア酸化触媒２２と、が夫々配設される。また、還元剤容器２４に貯蔵される尿素水溶液は、その底部で吸込口が開口する供給配管２６を通って還元剤添加装置２８に供給される。この還元剤添加装置２８に還元剤添加ＥＣＵ３０が備えられており、エンジン運転状態に応じた流量の尿素水溶液を噴射ノズル１８に供給する。 FIG. 1 shows the overall configuration of an exhaust purification device that uses an aqueous urea solution as a reducing agent precursor and purifies NOx contained in engine exhaust by a catalytic reduction reaction.
A nitrogen oxidation catalyst 16 that oxidizes nitrogen monoxide (NO) to nitrogen dioxide (NO 2 ) and an aqueous urea solution are injected along the exhaust circulation direction into the exhaust pipe 14 connected to the exhaust manifold 12 of the engine 10. An injection nozzle 18 to be supplied, a NOx reduction catalyst 20 that reduces and purifies NOx with ammonia obtained by hydrolyzing a urea aqueous solution, and an ammonia oxidation catalyst 22 that oxidizes ammonia that has passed through the NOx reduction catalyst 20 are provided. Is done. The aqueous urea solution stored in the reducing agent container 24 is supplied to the reducing agent adding device 28 through a supply pipe 26 having a suction port opened at the bottom thereof. The reducing agent addition device 28 is provided with a reducing agent addition ECU 30 and supplies a urea aqueous solution having a flow rate corresponding to the engine operating state to the injection nozzle 18.

噴射ノズル１８から噴射供給された尿素水溶液は、排気熱及び排気中の水蒸気により加水分解され、アンモニアへと転化される。転化されたアンモニアがＮＯｘ還元触媒２０において排気中のＮＯｘと反応することで、排気が浄化されるのは知られたことである。このとき、ＮＯｘ還元触媒２０によるＮＯｘ浄化効率を向上させるべく、窒素酸化触媒１６によりＮＯがＮＯ２へと酸化され、排気中のＮＯとＮＯ２との割合が触媒還元反応に適したものに改善される。また、ＮＯｘ還元触媒２０を通過したアンモニアは、その排気下流に配設されたアンモニア酸化触媒２２により酸化される。 The aqueous urea solution injected and supplied from the injection nozzle 18 is hydrolyzed by exhaust heat and water vapor in the exhaust, and converted into ammonia. It is known that the exhausted ammonia is purified by the converted ammonia reacting with the NOx in the exhaust gas in the NOx reduction catalyst 20. At this time, in order to improve the NOx purification efficiency by the NOx reduction catalyst 20, NO is oxidized to NO 2 by the nitrogen oxidation catalyst 16, improvements to what ratio between NO and NO 2 in the exhaust gas suitable for catalytic reduction reaction Is done. The ammonia that has passed through the NOx reduction catalyst 20 is oxidized by the ammonia oxidation catalyst 22 disposed downstream of the exhaust gas.

上記のような構成をもつ排気浄化装置の還元剤添加装置２８は、大型車両のトラクタを例にとると、図２の上方から見た概略レイアウト図に示すように、キャブ下に配置されたエンジン１０の後部脇にレイアウトされる。特に、ＥＣＵ３０を搭載している還元剤添加装置２８は、高温箇所をできるだけ避けて配置したいため、排気マニフォールド１２とは反対側のエンジン脇スペースに配置される。ただし、還元剤添加装置２８は、排気管１４内に位置するノズル１８へ尿素水溶液を供給しなければならないので、排気管１４から遠く離して配置することができず、その設置位置は、たとえば図２のようなレイアウトに制約される。   The reductant addition device 28 of the exhaust purification device having the above-described configuration is an engine disposed under the cab as shown in a schematic layout diagram viewed from above in FIG. 2, taking a tractor of a large vehicle as an example. 10 is laid out on the back side. In particular, the reducing agent addition device 28 equipped with the ECU 30 is arranged in an engine side space on the opposite side to the exhaust manifold 12 because it is desired to arrange the reducing agent addition device 28 while avoiding a high temperature portion as much as possible. However, since the reducing agent addition device 28 has to supply the urea aqueous solution to the nozzle 18 located in the exhaust pipe 14, it cannot be arranged far away from the exhaust pipe 14, and the installation position thereof is, for example, as shown in FIG. 2 is restricted to the layout.

このレイアウトにおいて、当該車両が走行すると、ラジエータ３２を通った熱風が還元剤添加装置２８へ流れてくることになる（矢示）。そこで、還元剤添加装置２８の温度上昇を抑制するため、還元剤添加装置２８を冷却するための送風器４０と、エンジン近傍の雰囲気温度に基づいて送風器４０を制御する温度スイッチ４２と、が設けられている。送風器４０は還元剤添加装置２８の近傍に設置される一方、温度スイッチ４２は、排気マニフォールド１２の近傍に設置されている。   In this layout, when the vehicle travels, hot air that has passed through the radiator 32 flows to the reducing agent adding device 28 (arrows). Therefore, in order to suppress the temperature rise of the reducing agent adding device 28, there are a blower 40 for cooling the reducing agent adding device 28 and a temperature switch 42 for controlling the blower 40 based on the ambient temperature in the vicinity of the engine. Is provided. The blower 40 is installed in the vicinity of the reducing agent adding device 28, while the temperature switch 42 is installed in the vicinity of the exhaust manifold 12.

温度スイッチ４２を排気マニフォールド１２の近傍に設置することで、エンジン１０の近傍の中でもより高温となる位置で、温度検出を実行させることができる。その理由は、温度スイッチ４２の周囲温度がスイッチ作動温度に到達してから実際に送風器４０が回り出すまでに、タイムラグが存在するからである。すなわち、還元剤添加装置２８と温度スイッチ４２とが同じ位置に設置してあると、レスポンスの遅れによって送風器４０の始動が遅くなり、還元剤添加装置２８の雰囲気温度が上限値を超えてしまう可能性がある。そこで、還元剤添加装置２８の設置位置よりも温度が急上昇する排気マニホールド１２の近傍に温度スイッチ４２を設置しておくと、温度スイッチ４２の周囲がスイッチ作動温度に到達したときに、還元剤添加装置２８の雰囲気温度は未だそれよりも低いということになるので、雰囲気温度の上昇に対する温度スイッチ４２のレスポンスの遅れを吸収することができ、送風器４０を始動させる温度をより正確に制御することができる。   By installing the temperature switch 42 in the vicinity of the exhaust manifold 12, temperature detection can be executed at a position where the temperature becomes higher in the vicinity of the engine 10. The reason is that there is a time lag from when the ambient temperature of the temperature switch 42 reaches the switch operating temperature until the blower 40 actually starts to rotate. That is, if the reducing agent adding device 28 and the temperature switch 42 are installed at the same position, the start of the blower 40 is delayed due to a delay in response, and the ambient temperature of the reducing agent adding device 28 exceeds the upper limit value. there is a possibility. Therefore, if a temperature switch 42 is installed in the vicinity of the exhaust manifold 12 where the temperature suddenly rises from the installation position of the reducing agent adding device 28, when the temperature switch 42 reaches the switch operating temperature, the reducing agent is added. Since the atmospheric temperature of the device 28 is still lower than that, it is possible to absorb the delay in the response of the temperature switch 42 to the increase in the atmospheric temperature, and to control the temperature at which the blower 40 is started more accurately. Can do.

送風器４０は、図３に示すように、還元剤添加装置２８に対し、車両後方の斜め上から送風する位置に設置される。すなわち、車両走行中にラジエータ３２を通して流れてくる熱風に対抗する向きから温度の低い風を送り、熱風を抑えて還元剤添加装置２８の上面温度上昇を抑制する。
また、本実施形態では、還元剤添加装置２８の車両前方に離間させて、略垂直に立てた防風板４４を設置している。この防風板４４は、還元剤添加装置２８よりも車両上方に突出する部分を車両後方へ向けて傾斜させた傾斜面部４４ａとしてある。このような形状の防風板４４は、還元剤添加装置２８の前方に位置してラジエータ３２から流れてくる熱風を避ける風除けの盾として機能する一方、傾斜面部４４ａにより、送風器４０からの風を、防風板４４と還元剤添加装置２８との間４６を通過するように導風する機能をもつ。この導風機能により、比較的温度の低い空気の層を防風板４４と還元剤添加装置２８との間４６に形成することができるので、冷却効果を高めることが可能となる。このような導風機能のために、還元剤添加装置２８に対する防風板４４の離間距離は、送風器４０による風を淀みなく流せる程度の間隔とするのがよい。 As shown in FIG. 3, the blower 40 is installed at a position where air is blown from the upper rear side of the vehicle with respect to the reducing agent adding device 28. That is, a low temperature wind is sent from the direction that opposes the hot air flowing through the radiator 32 while the vehicle is running, and the hot air is suppressed to suppress an increase in the upper surface temperature of the reducing agent adding device 28.
In the present embodiment, a windbreak plate 44 is installed so as to be separated from the front of the vehicle of the reducing agent adding device 28 and set up substantially vertically. The windbreak plate 44 is formed as an inclined surface portion 44a in which a portion protruding upward of the vehicle relative to the reducing agent adding device 28 is inclined toward the rear of the vehicle. The windbreak plate 44 having such a shape is positioned in front of the reducing agent adding device 28 and functions as a shield for avoiding hot air flowing from the radiator 32, while the inclined surface portion 44a allows the wind from the blower 40 to flow. The wind guide plate 44 and the reducing agent adding device 28 have a function of guiding the air so as to pass through 46. By this wind guide function, a layer of air having a relatively low temperature can be formed between the windbreak plate 44 and the reducing agent adding device 28, so that the cooling effect can be enhanced. For such a wind guide function, the separation distance of the windbreak plate 44 with respect to the reducing agent addition device 28 is preferably set to an interval that allows the air blown by the blower 40 to flow without stagnation.

さらに、還元剤添加装置２８の車両下方にも、略水平に寝かせた導風板４８を設置し、該導風板４８の還元剤添加装置２８よりも車両後方に突出する部分を、車両上方へ向けて傾斜させた傾斜面部４８ａとしてある。このような形状の導風板４８は、傾斜面部４８ａにより、送風器４０からの風を、導風板４８と還元剤添加装置２８との間５０を通過するように導風する機能をもつ。この導風機能により、比較的温度の低い空気の層を導風板４８と還元剤添加装置２８との間５０に形成することができるので、還元剤添加装置２８の下方に位置し得る熱源からの影響を抑制し、冷却効果を高めることができる。このような導風機能のために、還元剤添加装置２８に対する導風板４８の離間距離は、送風器４０による風を淀みなく流せる程度の間隔とするのがよい。   Further, a baffle plate 48 laid substantially horizontally is also provided below the reducing agent addition device 28 in the vehicle, and a portion of the baffle plate 48 that protrudes rearward of the reducing agent addition device 28 is located above the vehicle. The inclined surface portion 48a is inclined toward the surface. The air guide plate 48 having such a shape has a function of guiding the air from the blower 40 so as to pass between the air guide plate 48 and the reducing agent adding device 28 by the inclined surface portion 48a. By this wind guide function, a layer of air having a relatively low temperature can be formed 50 between the wind guide plate 48 and the reducing agent adding device 28, so that a heat source that can be located below the reducing agent adding device 28 is used. The effect of cooling can be suppressed and the cooling effect can be enhanced. For such a wind guide function, the separation distance of the wind guide plate 48 with respect to the reducing agent adding device 28 is preferably set to an interval that allows the air blown by the blower 40 to flow without stagnation.

以上のような送風器４０及び温度スイッチ４２を備えた排気浄化装置によれば、温度スイッチ４２に従って自動的にオンオフする送風器４０を用いた還元剤添加装置２８の空冷方式を採用しており、雰囲気温度が上限に達するほどに上昇する場合には自動的に送風器４０を動作させて、温度上昇を抑制することができる。すなわち、還元剤添加装置２８の雰囲気温度上昇が抑制され、上限温度を超えるほどの温度上昇が起こりにくくなっているので、レイアウトを共通化し、工数削減によるコスト抑制という効果を得られる。   According to the exhaust purification device including the blower 40 and the temperature switch 42 as described above, the air cooling method of the reducing agent addition device 28 using the blower 40 that automatically turns on and off according to the temperature switch 42 is adopted. When the ambient temperature rises to the upper limit, the blower 40 can be automatically operated to suppress the temperature rise. That is, an increase in the ambient temperature of the reducing agent addition device 28 is suppressed, and a temperature increase that exceeds the upper limit temperature is less likely to occur. Therefore, the layout can be made common, and the effect of cost reduction by reducing the number of steps can be obtained.

なお、本発明は本実施形態に限定されるものではなく、本発明を実施可能な範囲で変更できることは言うまでもない。   Note that the present invention is not limited to the present embodiment, and it goes without saying that the present invention can be modified within a range where the present invention can be implemented.

排気浄化装置の一例を示した図。The figure which showed an example of the exhaust gas purification apparatus. 送風器及び温度スイッチの設置位置を説明する図。The figure explaining the installation position of an air blower and a temperature switch. 送風器、防風板及び導風板の設置位置を説明する図。The figure explaining the installation position of an air blower, a wind-proof board, and a baffle.

符号の説明Explanation of symbols

１０ エンジン
１２ 排気マニフォールド
２８ 還元剤添加装置
３０ ＥＣＵ
３２ ラジエータ
４０ 送風器
４２ 温度スイッチ
４４ 防風板
４８ 導風板 10 Engine 12 Exhaust manifold 28 Reductant addition device 30 ECU
32 Radiator 40 Blower 42 Temperature switch 44 Windshield 48 Wind guide

Claims (5)

車両のエンジン排気管に配設された還元触媒と、
該還元触媒の排気上流へ還元剤を噴射するノズルと、
エンジン運転状態に応じた還元剤を前記ノズルに供給する還元剤添加装置と、
該還元剤添加装置を冷却するための送風器と、
エンジン近傍の雰囲気温度に基づいて前記送風器を制御する温度スイッチと、
を含んで構成されることを特徴とする排気浄化装置。 A reduction catalyst disposed in the engine exhaust pipe of the vehicle;
A nozzle for injecting a reducing agent upstream of the exhaust of the reduction catalyst;
A reducing agent addition device for supplying a reducing agent according to an engine operating state to the nozzle;
A blower for cooling the reducing agent addition device;
A temperature switch for controlling the blower based on the ambient temperature in the vicinity of the engine;
An exhaust emission control device comprising: 前記送風器は、前記還元剤添加装置に対し、車両後方の斜め上から送風する位置に設置されることを特徴とする請求項１記載の排気浄化装置。   2. The exhaust emission control device according to claim 1, wherein the blower is installed at a position where air is blown obliquely from the rear of the vehicle with respect to the reducing agent addition device. 前記還元剤添加装置よりも車両前方に離間させて、略垂直に立てた防風板を設置し、該防風板の前記還元剤添加装置よりも車両上方に突出する部分を車両後方へ向けて傾斜させたことを特徴とする請求項２記載の排気浄化装置。   A windproof plate is installed that is separated from the reducing agent addition device in front of the vehicle and is substantially vertical, and a portion of the windproof plate that protrudes above the reducing agent addition device is inclined toward the rear of the vehicle. The exhaust emission control device according to claim 2, wherein: 前記還元剤添加装置よりも車両下方に離間させて、略水平に寝かせた導風板を設置し、該導風板の前記還元剤添加装置よりも車両後方に突出する部分を車両上方へ向けて傾斜させたことを特徴とする請求項２又は請求項３記載の排気浄化装置。   A baffle plate that is separated from the reductant addition device and located substantially horizontally is installed, and a portion of the baffle plate that protrudes rearward of the reductant addition device is directed upward of the vehicle. The exhaust emission control device according to claim 2 or 3, wherein the exhaust gas purification device is inclined. 前記温度スイッチは、エンジンの排気マニホールド近傍に設置されることを特徴とする請求項１〜４のいずれか１項に記載の排気浄化装置。   The exhaust gas purification apparatus according to any one of claims 1 to 4, wherein the temperature switch is installed in the vicinity of an exhaust manifold of the engine.
JP2007075925A 2007-03-23 2007-03-23 Exhaust purification device Expired - Fee Related JP4845041B2 (en)

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CN101858237B (en) * 2009-04-09 2011-11-09 博世汽车柴油系统股份有限公司 Combustion motor waste gas treatment device and cooling and/or heating device used for same
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