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JP2005248924A - Exhaust emission control device of engine - Google Patents

Exhaust emission control device of engine Download PDF

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Publication number
JP2005248924A
JP2005248924A JP2004064058A JP2004064058A JP2005248924A JP 2005248924 A JP2005248924 A JP 2005248924A JP 2004064058 A JP2004064058 A JP 2004064058A JP 2004064058 A JP2004064058 A JP 2004064058A JP 2005248924 A JP2005248924 A JP 2005248924A
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Prior art keywords
reducing agent
agent supply
washing water
injection nozzle
upstream side
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JP2004064058A
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JP4137821B2 (en
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Masanobu Hirata
公信 平田
Nobuhiko Masaki
信彦 正木
Hisashi Akagawa
久 赤川
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UD Trucks Corp
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UD Trucks Corp
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Priority to JP2004064058A priority Critical patent/JP4137821B2/en
Priority to PCT/JP2005/001819 priority patent/WO2005085607A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • 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
    • 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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent clogging of a reducing agent by cleaning the reducing agent precipitated in a reducing agent supply path within a reducing agent supply device that supplies the reducing agent to an injection nozzle. <P>SOLUTION: The exhaust emission control device of an engine is provided with a reduction catalyst 5, the injection nozzle 7, and the reducing agent supply device 8. The reducing catalyst is arranged at the exhaust system of the engine 1, and performs the reduction cleanup of nitrogen oxides in the exhaust by the reducing agent. Then the injection nozzle injects the reducing agent into the upstream side of the exhaust of the reduction catalyst 5 within an exhaust passage 3 of the exhaust system. Then the reducing agent supply device supplies the reducing agent to the injection nozzle 7. The clogging of the reducing agent on the path for supplying the reducing agent to the injection nozzle 7 within the reducing agent supply device 8 is detected. Then the means (13, 14) of supplying wash water, which supply the wash water for cleaning the reducing agent precipitated in the reducing agent supply path, are added to the reducing agent supply device 8. Thus the reducing agent precipitated in the reducing agent supply path can be cleaned within the reducing agent supply device 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、移動車両搭載のディーゼルエンジン、ガソリンエンジン等から排出される窒素酸化物（ＮＯｘ）を、還元剤を還元触媒の排気上流側に供給して還元除去する排気浄化装置に関し、特に、還元剤供給装置内にて還元剤供給経路に析出した還元剤を洗浄して還元剤の目詰まりを防止するエンジンの排気浄化装置に係るものである。   The present invention relates to an exhaust emission control device that reduces and removes nitrogen oxides (NOx) discharged from a diesel engine, a gasoline engine, etc. mounted on a moving vehicle by supplying a reducing agent to the exhaust upstream side of a reduction catalyst. The present invention relates to an exhaust emission control device for an engine that cleans the reducing agent deposited in the reducing agent supply path in the agent supply device to prevent clogging of the reducing agent.

エンジンから排出される排気中の有害物質のうち、特にＮＯｘを除去して排気を浄化するシステムとして、いくつかの排気浄化装置が提案されている。この排気浄化装置は、エンジンの排気系に還元触媒を置き、該還元触媒の上流側の排気通路に還元剤を噴射供給することにより、排気中のＮＯｘと還元剤とを触媒還元反応させ、ＮＯｘを無害成分に浄化処理するものである。還元剤は貯蔵タンクに常温で液体状態に貯蔵され、必要量を噴射ノズルから噴射供給する。還元反応は、ＮＯｘとの反応性の良いアンモニアを用いるもので、還元剤としては、加水分解してアンモニアを容易に発生する尿素水溶液、アンモニア水溶液、その他の還元剤水溶液が用いられる（例えば、特許文献１参照）。
特開２０００−２７６２７号公報 Several exhaust purification devices have been proposed as a system for purifying exhaust by removing NOx in particular from harmful substances in exhaust discharged from the engine. This exhaust purification device places a reduction catalyst in an exhaust system of an engine, and injects and supplies a reducing agent into an exhaust passage upstream of the reduction catalyst, thereby causing NOx and reducing agent in the exhaust to undergo a catalytic reduction reaction, thereby reducing NOx. Is purified to harmless components. The reducing agent is stored in a storage tank in a liquid state at room temperature, and a required amount is injected and supplied from an injection nozzle. In the reduction reaction, ammonia having good reactivity with NOx is used, and as the reducing agent, an aqueous urea solution, an aqueous ammonia solution, or other reducing agent aqueous solution that easily generates ammonia by hydrolysis is used (for example, patents). Reference 1).
JP 2000-27627 A

上記従来の排気浄化装置においては、ＮＯｘ排出量や排気温度等のエンジンの運転状況に応じて、排気通路内にて還元触媒の排気上流側に還元剤、例えば尿素水溶液（以下、「尿素水」という）を噴射供給する量を制御するが、噴射ノズルに対して尿素水を供給する還元剤供給装置内の還元剤供給経路に尿素水（還元剤）が析出して目詰まりを起こし、上記還元触媒の排気上流側に尿素水を噴射することができなくなることがある。このような場合、上記還元触媒上におけるＮＯｘ還元反応が進行せず、排気中のＮＯｘがそのまま排出されてしまう虞がある。   In the above-described conventional exhaust purification device, a reducing agent, for example, an aqueous urea solution (hereinafter referred to as “urea water”) is disposed upstream of the reduction catalyst in the exhaust passage in accordance with the engine operating conditions such as the NOx emission amount and the exhaust temperature. The amount of urea supplied to the injection nozzle is controlled, but urea water (reducing agent) is deposited in the reducing agent supply path in the reducing agent supply device for supplying urea water to the injection nozzle. It may become impossible to inject urea water to the exhaust gas upstream side of the catalyst. In such a case, the NOx reduction reaction on the reduction catalyst does not proceed, and NOx in the exhaust may be discharged as it is.

このような還元剤供給装置内の還元剤供給経路での還元剤の目詰まりは、上記以外に、燃料である軽油やガソリン、若しくはアルコール類等を還元剤に用いる場合においても、その還元剤に含まれる不純物等により同様に発生する可能性があり、上記還元触媒の排気上流側に還元剤を噴射することができなくなることがある。この場合も、上記還元触媒上におけるＮＯｘ還元反応が進行せず、排気中のＮＯｘがそのまま排出されてしまう虞がある。   In addition to the above, clogging of the reducing agent in the reducing agent supply path in the reducing agent supply device is not limited to the above, even when light oil, gasoline, alcohol, or the like, which is a fuel, is used as the reducing agent. There is a possibility that it may occur in the same manner due to impurities contained therein, and it may not be possible to inject the reducing agent to the exhaust upstream side of the reduction catalyst. Also in this case, there is a possibility that the NOx reduction reaction on the reduction catalyst does not proceed and NOx in the exhaust is discharged as it is.

そこで、本発明は、このような問題点に対処し、還元剤供給装置内にて還元剤供給経路に析出した還元剤を洗浄して還元剤の目詰まりを防止するエンジンの排気浄化装置を提供することを目的とする。   Accordingly, the present invention addresses such problems and provides an exhaust emission control device for an engine that prevents the clogging of the reducing agent by washing the reducing agent deposited on the reducing agent supply path in the reducing agent supply device. The purpose is to do.

上記目的を達成するために、本発明によるエンジンの排気浄化装置は、エンジンの排気系に配設され、排気中の窒素酸化物を還元剤により還元浄化する還元触媒と、上記排気系の排気通路内にて還元剤を上記還元触媒の排気上流側に噴射する噴射ノズルと、この噴射ノズルに対して還元剤を供給する還元剤供給装置と、を備えたエンジンの排気浄化装置であって、上記還元剤供給装置内にて上記噴射ノズルに還元剤を供給する経路上での還元剤の目詰まりを検出し、その還元剤供給経路に析出した還元剤を洗浄する洗浄水を供給する洗浄水供給手段を、該還元剤供給装置に付加したものである。   In order to achieve the above object, an exhaust emission control device for an engine according to the present invention is provided in an exhaust system of an engine and reduces and purifies nitrogen oxides in exhaust gas with a reducing agent, and an exhaust passage of the exhaust system. An exhaust purification device for an engine, comprising: an injection nozzle that injects a reducing agent into the exhaust upstream side of the reduction catalyst; and a reducing agent supply device that supplies the reducing agent to the injection nozzle, A cleaning water supply that detects clogging of the reducing agent on the path for supplying the reducing agent to the injection nozzle in the reducing agent supply device and supplies cleaning water for cleaning the reducing agent deposited on the reducing agent supply path. Means are added to the reducing agent supply apparatus.

このような構成により、噴射ノズルに対して還元剤を供給する還元剤供給装置に付加された洗浄水供給手段によって、上記還元剤供給装置内にて上記噴射ノズルに還元剤を供給する経路上での還元剤の目詰まりを検出し、その還元剤供給経路に析出した還元剤を洗浄する洗浄水を供給して、目詰まりした還元剤を洗浄する。   With such a configuration, on the path for supplying the reducing agent to the injection nozzle in the reducing agent supply device by the cleaning water supply means added to the reducing agent supply device for supplying the reducing agent to the injection nozzle. The clogging of the reducing agent is detected, and cleaning water for cleaning the reducing agent deposited on the reducing agent supply path is supplied to wash the clogged reducing agent.

ここで、上記還元剤供給装置は、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口を備えると共に、上記絞り手段の下流側にて還元剤と混合する部位の下流側近傍に連通する洗浄水出口を備え、上記洗浄水入口に洗浄水供給手段を接続したものである。
これにより、上記還元剤供給装置内の還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口に接続された洗浄水供給手段で洗浄水を供給して洗浄し、上記絞り手段の下流側にて還元剤と混合する部位の下流側近傍に連通する洗浄水出口から排出する。 Here, the reducing agent supply device includes a cleaning water inlet that communicates with the vicinity of the upstream side of the throttle unit that throttles the pressure air supplied from the upstream side on the reducing agent supply path, and is downstream of the throttle unit. A washing water outlet communicating with the vicinity of the downstream side of the portion mixed with the reducing agent on the side is provided, and a washing water supply means is connected to the washing water inlet.
As a result, the washing is performed by the washing water supply means connected to the washing water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path in the reducing agent supply apparatus. Water is supplied for cleaning, and the water is discharged from the cleaning water outlet communicating with the vicinity of the downstream side of the portion mixed with the reducing agent on the downstream side of the throttling means.

また、上記還元剤供給装置は、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口を備えると共に、上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を洗浄水出口とし、上記洗浄水入口に洗浄水供給手段を接続したものである。
これにより、上記還元剤供給装置内の還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口に接続された洗浄水供給手段で洗浄水を供給して洗浄し、上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を洗浄水出口として排出する。 The reducing agent supply device includes a cleaning water inlet that communicates with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path. In the downstream side, the connection port to the injection nozzle is a washing water outlet, and the washing water supply means is connected to the washing water inlet.
As a result, the washing is performed by the washing water supply means connected to the washing water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path in the reducing agent supply apparatus. Water is supplied for cleaning, and the connection port to the injection nozzle is discharged as a cleaning water outlet on the downstream side of the reducing agent supply path.

さらに、上記還元剤供給装置は、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口を備えると共に、上記絞り手段の下流側にて還元剤と混合する部位の下流側近傍に連通する一の洗浄水出口を備え、かつ上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を他の洗浄水出口とし、上記洗浄水入口に洗浄水供給手段を接続したものである。
これにより、上記還元剤供給装置内の還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口に接続された洗浄水供給手段で洗浄水を供給して洗浄し、上記絞り手段の下流側にて還元剤と混合する部位の下流側近傍に連通する一の洗浄水出口から排出し、及び上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を他の洗浄水出口として排出する。 Further, the reducing agent supply device includes a cleaning water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path, and the downstream side of the throttle means. Provided with one wash water outlet that communicates with the vicinity of the downstream side of the portion to be mixed with the reducing agent, and the connection port to the injection nozzle on the downstream side of the reducing agent supply path as another washing water outlet, A cleaning water supply means is connected to the cleaning water inlet.
As a result, the washing is performed by the washing water supply means connected to the washing water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path in the reducing agent supply apparatus. Water is supplied and washed, discharged from one washing water outlet communicating with the vicinity of the downstream side of the portion to be mixed with the reducing agent on the downstream side of the throttling means, and the downstream side of the reducing agent supply path The connection port to the injection nozzle is discharged as another washing water outlet.

さらにまた、上記還元剤供給装置は、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の下流側で上記噴射ノズルへの接続口の上流側近傍に連通する洗浄水入口を備えると共に、上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を洗浄水出口とし、上記洗浄水入口に洗浄水供給手段を接続したものである。
これにより、上記還元剤供給装置内の還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の下流側で上記噴射ノズルへの接続口の上流側近傍に連通する洗浄水入口に接続された洗浄水供給手段で洗浄水を供給して洗浄し、上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を洗浄水出口として排出する。 Furthermore, the reducing agent supply device is a cleaning device that communicates with the vicinity of the upstream side of the connection port to the injection nozzle on the downstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path. A water inlet is provided, and a connection port to the injection nozzle is used as a cleaning water outlet on the downstream side of the reducing agent supply path, and a cleaning water supply means is connected to the cleaning water inlet.
Accordingly, on the reducing agent supply path in the reducing agent supply apparatus, the washing water communicated with the vicinity of the upstream side of the connection port to the injection nozzle on the downstream side of the throttle means for restricting the pressure air supplied from the upstream side. Washing water is supplied and washed by the washing water supply means connected to the inlet, and the connection port to the injection nozzle is discharged as a washing water outlet on the downstream side of the reducing agent supply path.

また、上記還元剤供給装置は、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する一の洗浄水入口を備えると共に、上記絞り手段の下流側で上記噴射ノズルへの接続口の上流側近傍に連通する他の洗浄水入口を備え、かつ上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を洗浄水出口とし、上記一の洗浄水入口及び他の洗浄水入口に洗浄水供給手段を接続したものである。
これにより、上記還元剤供給装置内の還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する一の洗浄水入口及び上記絞り手段の下流側で上記噴射ノズルへの接続口の上流側近傍に連通する他の洗浄水入口に接続された洗浄水供給手段で洗浄水を供給して洗浄し、上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を洗浄水出口として排出する。 In addition, the reducing agent supply device includes a flush water inlet that communicates with the vicinity of the upstream side of the throttle unit that throttles the pressure air supplied from the upstream side on the reducing agent supply path. Provided with another washing water inlet communicating with the vicinity of the upstream side of the connection port to the injection nozzle on the downstream side, and the connection port to the injection nozzle on the downstream side of the reducing agent supply path as a washing water outlet, A washing water supply means is connected to one washing water inlet and the other washing water inlet.
As a result, on the reducing agent supply path in the reducing agent supply device, at one downstream side of the cleaning water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side, and downstream of the throttle means Washing water is supplied and washed by washing water supply means connected to another washing water inlet communicating with the vicinity of the upstream side of the connection port to the injection nozzle, and the injection nozzle is arranged downstream of the reducing agent supply path. Drain the connection port to the washing water outlet.

さらに、上記還元剤供給装置は、上記還元剤供給経路上にて上記絞り手段の下流側と上記噴射ノズルへの接続口の上流側との間に、還元剤の目詰まりの有無を検出する圧力検知手段を備え、上記還元剤供給経路上にて上記絞り手段側又は噴射ノズル側の目詰まりかを検出するようにしたものである。
これにより、上記還元剤供給経路上にて上記絞り手段の下流側と上記噴射ノズルへの接続口の上流側との間に設けられた圧力検知手段で還元剤の目詰まりの有無を検出し、該還元剤供給経路上にて上記絞り手段側又は噴射ノズル側の目詰まりかを検出する。 Further, the reducing agent supply device is configured to detect whether the reducing agent is clogged between the downstream side of the throttle means and the upstream side of the connection port to the injection nozzle on the reducing agent supply path. A detecting means is provided to detect whether the throttle means side or the injection nozzle side is clogged on the reducing agent supply path.
Thereby, the presence or absence of clogging of the reducing agent is detected by the pressure detection means provided between the downstream side of the throttle means and the upstream side of the connection port to the injection nozzle on the reducing agent supply path, It is detected whether the throttle means side or the injection nozzle side is clogged on the reducing agent supply path.

さらにまた、上記洗浄水供給手段は、洗浄水を貯留しておく洗浄水タンクと、この洗浄水タンクから送られる洗浄水を加圧して上記還元剤供給装置の洗浄水入口へ供給する洗浄水ポンプとを有するものである。
これにより、洗浄水タンクで洗浄水を貯留しておき、この洗浄水タンクから送られる洗浄水を洗浄水ポンプで加圧して上記還元剤供給装置の洗浄水入口へ供給する。 Furthermore, the washing water supply means includes a washing water tank for storing washing water, and a washing water pump that pressurizes the washing water sent from the washing water tank and supplies the washing water to the washing water inlet of the reducing agent supply device. It has.
Thus, the cleaning water is stored in the cleaning water tank, and the cleaning water sent from the cleaning water tank is pressurized by the cleaning water pump and supplied to the cleaning water inlet of the reducing agent supply device.

そして、上記洗浄水供給手段は、上記洗浄水タンクから送られる洗浄水を加熱するヒータをさらに備えたものである。
これにより、ヒータで上記洗浄水タンクから送られる洗浄水を加熱する。 The cleaning water supply means further includes a heater for heating the cleaning water sent from the cleaning water tank.
Thereby, the washing water sent from the washing water tank is heated by the heater.

請求項１に係る発明によれば、噴射ノズルに対して還元剤を供給する還元剤供給装置に付加された洗浄水供給手段により洗浄水を供給し、上記還元剤供給装置内にて還元剤供給経路に析出した還元剤を洗浄して還元剤の目詰まりを防止することができる。したがって、上記還元剤供給装置から噴射ノズルに対して還元剤をスムーズに供給し、排気系に配設された還元触媒の排気上流側に還元剤を適切に噴射することができる。これにより、上記還元触媒上における還元反応が進行して、排気中の窒素酸化物の浄化率を向上することができる。   According to the first aspect of the present invention, the cleaning water is supplied by the cleaning water supply means added to the reducing agent supply device that supplies the reducing agent to the injection nozzle, and the reducing agent is supplied in the reducing agent supply device. The reducing agent deposited on the path can be washed to prevent clogging of the reducing agent. Therefore, the reducing agent can be smoothly supplied from the reducing agent supply device to the injection nozzle, and the reducing agent can be appropriately injected upstream of the reduction catalyst disposed in the exhaust system. Thereby, the reduction reaction on the reduction catalyst proceeds, and the purification rate of nitrogen oxides in the exhaust can be improved.

ここで、請求項２に係る発明によれば、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口から洗浄水を供給し、上記絞り手段の下流側にて還元剤と混合する部位の下流側近傍に連通する洗浄水出口から排出して、上記絞り手段の下流側にて還元剤と混合する部位に析出した還元剤を洗浄して還元剤の目詰まりを防止することができる。   According to the second aspect of the present invention, the cleaning water is supplied from the cleaning water inlet that communicates with the vicinity of the upstream side of the throttle means that throttles the pressure air supplied from the upstream side on the reducing agent supply path. The reducing agent discharged from the washing water outlet communicating with the vicinity of the downstream side of the portion to be mixed with the reducing agent on the downstream side of the throttling means and deposited on the portion to be mixed with the reducing agent on the downstream side of the throttling means Washing can prevent clogging of the reducing agent.

また、請求項３に係る発明によれば、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口から洗浄水を供給し、上記還元剤供給経路の下流側にて噴射ノズルへの接続口を洗浄水出口として排出し、上記還元剤供給経路の下流側にて噴射ノズルへの接続口までの間に析出した還元剤を洗浄して還元剤の目詰まりを防止することができる。   Further, according to the invention according to claim 3, the cleaning water is supplied from the cleaning water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path, The connecting port to the injection nozzle is discharged as a washing water outlet on the downstream side of the reducing agent supply path, and the reducing agent deposited between the connecting port to the injection nozzle on the downstream side of the reducing agent supply path is cleaned. Thus, clogging of the reducing agent can be prevented.

さらに、請求項４に係る発明によれば、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口から洗浄水を供給し、上記絞り手段の下流側にて還元剤と混合する部位の下流側近傍に連通する一の洗浄水出口から排出し、かつ上記還元剤供給経路の下流側にて噴射ノズルへの接続口を他の洗浄水出口として排出し、上記絞り手段の下流側にて還元剤と混合する部位から上記還元剤供給経路の下流側にて噴射ノズルへの接続口までの間に析出した還元剤を洗浄して還元剤の目詰まりを防止することができる。   Further, according to the invention according to claim 4, the cleaning water is supplied from the cleaning water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path, Discharge from one washing water outlet communicating with the vicinity of the downstream side of the portion where the reducing agent is mixed downstream of the throttling means, and connect the other port to the injection nozzle downstream of the reducing agent supply path It is discharged as a washing water outlet, and the reducing agent deposited between the portion mixed with the reducing agent on the downstream side of the throttling means and the connection port to the injection nozzle on the downstream side of the reducing agent supply path is washed. It is possible to prevent clogging of the reducing agent.

さらにまた、請求項５に係る発明によれば、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の下流側で噴射ノズルへの接続口の上流側近傍に連通する洗浄水入口から洗浄水を供給し、上記噴射ノズルへの接続口を洗浄水出口として排出し、上記還元剤供給経路の下流側にて噴射ノズルへの接続口までの間に析出した還元剤を洗浄して還元剤の目詰まりを防止することができる。   Furthermore, according to the fifth aspect of the present invention, communication is made in the vicinity of the upstream side of the connection port to the injection nozzle on the downstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path. Reducing agent that has been supplied from the cleaning water inlet, discharged from the connection port to the injection nozzle as a cleaning water outlet, and deposited on the downstream side of the reducing agent supply path to the connection port to the injection nozzle To prevent clogging of the reducing agent.

また、請求項６に係る発明によれば、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する一の洗浄水入口から洗浄水を供給し、かつ上記絞り手段の下流側で上記噴射ノズルへの接続口の上流側近傍に連通する他の洗浄水入口から洗浄水を供給し、上記噴射ノズルへの接続口を洗浄水出口として排出し、上記還元剤供給経路の下流側にて噴射ノズルへの接続口までの間に析出した還元剤を洗浄して還元剤の目詰まりを防止することができる。   According to the invention of claim 6, the wash water is supplied from one wash water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path. In addition, cleaning water is supplied from another cleaning water inlet communicating with the vicinity of the upstream side of the connection port to the injection nozzle on the downstream side of the throttle means, and the connection port to the injection nozzle is discharged as a cleaning water outlet. The reducing agent deposited between the reducing agent supply path and the connection port to the injection nozzle can be washed to prevent clogging of the reducing agent.

さらに、請求項７に係る発明によれば、圧力検知手段で還元剤の目詰まりの有無を検出すると共に、上記還元剤供給経路上にて上流の絞り手段側又は下流の噴射ノズル側の目詰まりかを検出して、各々対応した洗浄水入口から洗浄水を供給し、洗浄水出口から排出して、上記還元剤供給経路上に析出した還元剤を洗浄して還元剤の目詰まりを防止することができる。   According to the seventh aspect of the present invention, the pressure detection means detects the presence or absence of clogging of the reducing agent, and the clogging on the upstream throttle means side or the downstream injection nozzle side on the reducing agent supply path. The cleaning water is supplied from the corresponding cleaning water inlet, discharged from the cleaning water outlet, and the reducing agent deposited on the reducing agent supply path is washed to prevent clogging of the reducing agent. be able to.

また、請求項８に係る発明によれば、洗浄水タンクから送られる洗浄水を洗浄水ポンプで加圧して上記還元剤供給装置の洗浄水入口へ供給することにより、還元剤供給経路上に析出した還元剤を確実に洗浄して還元剤の目詰まりを防止することができる。   According to the eighth aspect of the present invention, the cleaning water sent from the cleaning water tank is pressurized by the cleaning water pump and supplied to the cleaning water inlet of the reducing agent supply device, thereby depositing on the reducing agent supply path. Thus, the reducing agent can be reliably washed to prevent clogging of the reducing agent.

さらに、請求項９に係る発明によれば、上記洗浄水タンクから送られる洗浄水をヒータで加熱することにより、還元剤供給経路上に析出した還元剤の洗浄性を向上して、還元剤の目詰まりを防止することができる。   Furthermore, according to the ninth aspect of the present invention, the cleaning water sent from the cleaning water tank is heated with a heater, thereby improving the cleaning performance of the reducing agent deposited on the reducing agent supply path, and reducing the reducing agent. Clogging can be prevented.

以下、本発明の実施形態を添付図面に基づいて詳細に説明する。図１は本発明によるエンジンの排気浄化装置の実施形態を示す概念図である。この排気浄化装置は、移動車両搭載のディーゼルエンジン、ガソリンエンジン等から排出されるＮＯｘを、還元剤を用いて還元除去するものである。ガソリンあるいは軽油を燃料とするエンジン１の排気は、排気マニフォ−ルド２から排気通路としての排気管３を経由して大気中に排出される。詳細には、上記排気管３には排気上流側から順に、一酸化窒素（ＮＯ）の酸化触媒４、ＮＯｘの還元触媒５、アンモニアスリップ用酸化触媒６が配設され、その前後に温度センサ、ＮＯｘセンサ等が配設されて排気系が構成されるが、細部の構成は図示していない。   Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a conceptual diagram showing an embodiment of an engine exhaust gas purification apparatus according to the present invention. This exhaust purification device is for reducing and removing NOx discharged from a diesel engine, a gasoline engine or the like mounted on a moving vehicle using a reducing agent. The exhaust of the engine 1 using gasoline or light oil as fuel is discharged from the exhaust manifold 2 into the atmosphere via an exhaust pipe 3 serving as an exhaust passage. Specifically, the exhaust pipe 3 is provided with an oxidation catalyst 4 of nitric oxide (NO), a NOx reduction catalyst 5 and an ammonia slip oxidation catalyst 6 in order from the exhaust upstream side. An exhaust system is configured by providing a NOx sensor or the like, but the detailed configuration is not shown.

上記酸化触媒４は、排気管３内を通る排気中のＮＯ等を酸化反応により低減するもので、例えばステンレス鋼等の耐熱性、耐食性に優れた材料から成りハニカム形状の横断面を有するモノリスタイプの触媒担体に、アルミナ等の多孔性部材の表面に白金等の貴金属を担持したハニカム型触媒が付設されている。そして、上記排気管３内を通る排気が上記触媒と接触しながら流れることにより、排気中のＮＯが酸化してＮＯ2となり、下流側の還元触媒５におけるＮＯｘの除去率を向上するようになっている。なお、上記ＮＯの酸化反応と同時に、排気中の炭化水素（ＨＣ）、一酸化炭素（ＣＯ）等も酸化反応により低減されることとなる。 The oxidation catalyst 4 reduces NO or the like in the exhaust gas passing through the exhaust pipe 3 by an oxidation reaction. For example, the oxidation catalyst 4 is a monolith type having a honeycomb-shaped cross section made of a material having excellent heat resistance and corrosion resistance such as stainless steel. A honeycomb type catalyst carrying a noble metal such as platinum on the surface of a porous member such as alumina is attached to the catalyst carrier. The exhaust gas passing through the exhaust pipe 3 flows while in contact with the catalyst, so that NO in the exhaust gas is oxidized to NO 2 , and the NOx removal rate in the downstream reduction catalyst 5 is improved. ing. Simultaneously with the oxidation reaction of NO, hydrocarbons (HC), carbon monoxide (CO), etc. in the exhaust gas are reduced by the oxidation reaction.

上記ＮＯｘの還元触媒５は、排気管３内を通る排気中のＮＯｘを還元剤により還元浄化するもので、例えばセラミックのコーディライトやＦｅ−Ｃｒ−Ａｌ系の耐熱鋼から成るハニカム形状の横断面を有するモノリスタイプの触媒担体に、ゼオライト系の活性成分が担持されている。そして、上記触媒担体に担持された活性成分は、還元剤の供給を受けて活性化し、排気中のＮＯｘを効果的に無害物質に浄化させる。なお、上記ＮＯｘの還元触媒５の後段には、アンモニアスリップ用酸化触媒６が配設されている。   The NOx reduction catalyst 5 is for reducing and purifying NOx in the exhaust gas passing through the exhaust pipe 3 with a reducing agent. For example, the honeycomb-shaped cross section made of ceramic cordierite or Fe-Cr-Al heat-resistant steel is used. A zeolite-type active component is supported on a monolith type catalyst carrier having the following. Then, the active component supported on the catalyst carrier is activated by the supply of the reducing agent, and effectively purifies NOx in the exhaust gas into a harmless substance. An ammonia slip oxidation catalyst 6 is disposed downstream of the NOx reduction catalyst 5.

上記排気管３の内部にてＮＯｘの還元触媒５の上流側には、噴射ノズル７が配設されている。この噴射ノズル７は、上記排気管３の内部にて還元剤をＮＯｘの還元触媒５の排気上流側に噴射するもので、後述の還元剤供給装置８から還元剤が圧力エアと共に供給されて排気管３内に噴射供給するようになっている。ここで、上記噴射ノズル７は、その先端部が排気の流れ方向Ａと略平行に下流側に向けて延びているものとしたが、排気管３内にて排気の流れ方向Ａと略直角に突き出るものとしてもよい。   An injection nozzle 7 is disposed in the exhaust pipe 3 upstream of the NOx reduction catalyst 5. The injection nozzle 7 injects a reducing agent into the exhaust upstream side of the NOx reduction catalyst 5 inside the exhaust pipe 3. The reducing agent is supplied together with pressure air from a reducing agent supply device 8, which will be described later. The pipe 3 is supplied with injection. Here, the tip of the injection nozzle 7 is assumed to extend toward the downstream side substantially in parallel with the exhaust flow direction A. However, the injection nozzle 7 is substantially perpendicular to the exhaust flow direction A in the exhaust pipe 3. It may be protruding.

上記噴射ノズル７には、還元剤供給装置８が接続されている。この還元剤供給装置８は、上記噴射ノズル７に対して還元剤を供給するもので、貯蔵タンク９内に貯留された還元剤が供給配管１０を通じて供給され、内部で圧力エアと混合した状態で噴射ノズル７に還元剤を供給するようになっている。   A reducing agent supply device 8 is connected to the injection nozzle 7. The reducing agent supply device 8 supplies the reducing agent to the injection nozzle 7. The reducing agent stored in the storage tank 9 is supplied through the supply pipe 10 and mixed with the pressure air inside. A reducing agent is supplied to the injection nozzle 7.

この実施形態では、上記噴射ノズル７で噴射供給する還元剤として尿素水溶液（尿素水）を用いる。他にアンモニア水溶液等を用いてもよい。そして、噴射ノズル７で噴射供給された尿素水は、排気管３内の排気熱により加水分解してアンモニアを容易に発生する。得られたアンモニアは、ＮＯｘの還元触媒５において排気中のＮＯｘと反応し、水及び無害なガスに浄化される。尿素水は、固体もしくは粉体の尿素の水溶液で、貯蔵タンク９に貯留されており、供給配管１０を通じて還元剤供給装置８に供給されるようになっている。   In this embodiment, a urea aqueous solution (urea water) is used as a reducing agent to be supplied by injection from the injection nozzle 7. In addition, an aqueous ammonia solution or the like may be used. The urea water injected and supplied from the injection nozzle 7 is hydrolyzed by the exhaust heat in the exhaust pipe 3 and easily generates ammonia. The obtained ammonia reacts with NOx in the exhaust gas in the NOx reduction catalyst 5 to be purified into water and harmless gas. The urea water is a solid or powdery urea aqueous solution, stored in the storage tank 9, and supplied to the reducing agent supply device 8 through the supply pipe 10.

なお、上記還元剤供給装置８には、例えばＣＰＵから成る制御回路としてのＥＣＵ（Engine Control Unit）１１が信号線１２で接続されており、該ＥＣＵ１１から送出される制御信号により上記還元剤供給装置８の動作が制御されて、噴射ノズル７からの還元剤の供給が制御されるようになっている。   The reducing agent supply device 8 is connected to an ECU (Engine Control Unit) 11 as a control circuit composed of, for example, a CPU via a signal line 12, and the reducing agent supply device is controlled by a control signal sent from the ECU 11. 8 is controlled so that the supply of the reducing agent from the injection nozzle 7 is controlled.

このように構成された排気浄化装置において、還元剤（尿素水）を上記還元触媒５の排気上流側に供給する動作について説明する。まず、エンジン１の運転による排気は、排気マニフォ−ルド２から排気管３を経由して、該排気管３内の途中に配設された酸化触媒４、及びＮＯｘの還元触媒５、更にアンモニアスリップ用酸化触媒６を通り、排気管３の端部排出口から大気中に排出される。このとき、上記排気管３の内部にてＮＯｘの還元触媒５の排気上流側に配設された噴射ノズル７から尿素水が噴射される。すなわち、尿素水の貯蔵タンク９から供給配管１０を介して尿素水が還元剤供給装置８に供給され、この還元剤供給装置８の動作により圧力エアと共に尿素水が上記噴射ノズル７に供給されて、排気中に噴射供給される。   An operation of supplying the reducing agent (urea water) to the exhaust upstream side of the reduction catalyst 5 in the exhaust purification apparatus configured as described above will be described. First, exhaust from the operation of the engine 1 is performed through the exhaust manifold 2 via the exhaust pipe 3, the oxidation catalyst 4 disposed in the middle of the exhaust pipe 3, the NOx reduction catalyst 5, and further the ammonia slip. It passes through the oxidation catalyst 6 and is discharged into the atmosphere from the end outlet of the exhaust pipe 3. At this time, urea water is injected from the injection nozzle 7 disposed on the exhaust upstream side of the NOx reduction catalyst 5 inside the exhaust pipe 3. That is, urea water is supplied from the urea water storage tank 9 to the reducing agent supply device 8 through the supply pipe 10, and urea water is supplied to the injection nozzle 7 together with pressure air by the operation of the reducing agent supply device 8. Injected into exhaust.

その後、エンジン１の運転停止により、噴射ノズル７からの尿素水の噴射を終了するには、還元剤供給装置８の動作により、まず貯蔵タンク９からの尿素水の供給を遮断し、その後しばらくは噴射ノズル７に圧力エアだけを供給する。これにより、噴射ノズル７のノズル本体及び噴射孔から尿素水を追い出して、尿素水の噴射を終了する。   Thereafter, in order to terminate the injection of the urea water from the injection nozzle 7 by stopping the operation of the engine 1, the supply of the urea water from the storage tank 9 is first shut off by the operation of the reducing agent supply device 8, and then for a while. Only pressure air is supplied to the injection nozzle 7. Thereby, urea water is expelled from the nozzle main body and the injection hole of the injection nozzle 7, and the injection of urea water is complete | finished.

ここで、本発明においては、上記還元剤供給装置８に洗浄水供給手段が付加されている。この洗浄水供給手段は、上記還元剤供給装置８内にて上記噴射ノズル７に還元剤（尿素水）を供給する経路上での尿素水の目詰まりの有無を検出し、その還元剤供給経路に析出した尿素水を洗浄する洗浄水を供給するもので、洗浄水タンク１３と、洗浄水ポンプ１４とを有している。   Here, in the present invention, a washing water supply means is added to the reducing agent supply device 8. This washing water supply means detects the presence or absence of clogging of urea water on the path for supplying the reducing agent (urea water) to the injection nozzle 7 in the reducing agent supply device 8, and the reducing agent supply path A cleaning water tank for cleaning the urea water deposited on the water is supplied, and a cleaning water tank 13 and a cleaning water pump 14 are provided.

上記洗浄水タンク１３は、上記還元剤供給経路に析出した尿素水を洗浄する洗浄水を貯留しておくもので、例えば図２に示すように、一つの独立した容器から成る。そして、この洗浄水タンク１３から上記還元剤供給装置８に洗浄水を送る給水配管１５上には、洗浄水ポンプ１４が設けられている。この洗浄水ポンプ１４は、上記洗浄水タンク１３から送られる洗浄水を加圧して上記還元剤供給装置８の洗浄水入口へ供給するもので、適宜の加圧ポンプから成り、洗浄水を所定の圧力に加圧するようになっている。なお、上記給水配管１５上にて洗浄水ポンプ１４の前段には、フィルタ１６が設けられており、上記洗浄水タンク１３から送られる洗浄水に含まれるゴミや異物等を除去するようになっている。   The washing water tank 13 stores washing water for washing the urea water deposited on the reducing agent supply path, and includes, for example, one independent container as shown in FIG. A wash water pump 14 is provided on a water supply pipe 15 that sends wash water from the wash water tank 13 to the reducing agent supply device 8. The washing water pump 14 pressurizes the washing water sent from the washing water tank 13 and supplies the washing water to the washing water inlet of the reducing agent supply device 8. The pressure is increased. A filter 16 is provided on the water supply pipe 15 in front of the cleaning water pump 14 to remove dust, foreign matters, etc. contained in the cleaning water sent from the cleaning water tank 13. Yes.

また、上記給水配管１５上にて洗浄水ポンプ１４の後段には、ヒータ１７がさらに設けられている。このヒータ１７は、上記洗浄水タンク１３から送られる洗浄水を加熱するもので、適宜の加熱手段から成り、洗浄水を所定の温度に加熱するようになっている。この場合は、上記還元剤供給装置８内の還元剤供給経路に析出した尿素水の洗浄性を向上することができる。   A heater 17 is further provided on the water supply pipe 15 at the subsequent stage of the washing water pump 14. The heater 17 heats the washing water sent from the washing water tank 13 and is composed of an appropriate heating means so as to heat the washing water to a predetermined temperature. In this case, the washability of the urea water deposited on the reducing agent supply path in the reducing agent supply device 8 can be improved.

さらに、図２において、上記還元剤供給装置８には、エアタンク１８が接続されている。このエアタンク１８は、図１に示す貯蔵タンク９から供給配管１０を通じて還元剤供給装置８内に供給された尿素水と混合する圧力エアを供給するものである。そして、上記還元剤供給装置８の内部で尿素水と圧力エアとを混合した状態で、噴射ノズル７に還元剤を供給するようになっている。   Further, in FIG. 2, an air tank 18 is connected to the reducing agent supply device 8. The air tank 18 supplies pressure air to be mixed with urea water supplied into the reducing agent supply device 8 from the storage tank 9 shown in FIG. The reducing agent is supplied to the injection nozzle 7 in a state where urea water and pressure air are mixed inside the reducing agent supply device 8.

なお、図２では、上記洗浄水タンク１３は一つの独立した容器から成るものとしたが、本発明はこれに限られず、例えばエンジン冷却水の系統に給水配管１５を接続して、エンジン冷却水を洗浄水として用いてもよい。この場合、上記還元剤供給装置８内の洗浄の機会は頻繁ではないと考えられるので、エンジン冷却水の予備タンク分で洗浄可能である。   In FIG. 2, the washing water tank 13 is composed of one independent container. However, the present invention is not limited to this. For example, a water supply pipe 15 is connected to the engine cooling water system to May be used as washing water. In this case, since it is considered that the opportunity for cleaning in the reducing agent supply device 8 is not frequent, it is possible to clean with a reserve tank of engine cooling water.

図３は、上記還元剤供給装置８の内部構造を示す断面説明図である。まず、この還元剤供給装置８の内部にて、その中心部には上記貯蔵タンク９から噴射ノズル７に還元剤を供給する経路となる還元剤供給経路２０が形成されている。そして、この還元剤供給経路２０の上流側には、一の分岐管２１ａを介して還元剤入口２２が設けられ、他の分岐管２１ｂを介して圧力エア入口２３が設けられている。また、他の分岐管２１ｂの途中には、図２に示すエアタンク１８から供給される圧力エアを絞る絞り手段としてのオリフィス２４が形成されている。   FIG. 3 is a cross-sectional explanatory view showing the internal structure of the reducing agent supply device 8. First, a reducing agent supply path 20 serving as a path for supplying the reducing agent from the storage tank 9 to the injection nozzle 7 is formed in the center of the reducing agent supply apparatus 8. Further, on the upstream side of the reducing agent supply path 20, a reducing agent inlet 22 is provided via one branch pipe 21a, and a pressure air inlet 23 is provided via another branch pipe 21b. Further, in the middle of the other branch pipe 21b, an orifice 24 is formed as a throttle means for restricting the pressure air supplied from the air tank 18 shown in FIG.

そして、上記オリフィス２４の上流側近傍から分岐する連通管２５を介して第１の洗浄水入口２６が設けられている。この第１の洗浄水入口２６が、上記還元剤供給経路２０上にてその上流側から供給される圧力エアを絞るオリフィス２４の上流側近傍に連通する一の洗浄水入口となる。また、上記オリフィス２４の下流側近傍から分岐する連通管２７を介して第１の洗浄水出口２８が設けられている。この第１の洗浄水出口２８が、上記オリフィス２４の下流側にて還元剤と混合する部位の下流側近傍に連通する一の洗浄水出口となる。   A first washing water inlet 26 is provided through a communication pipe 25 that branches from the vicinity of the upstream side of the orifice 24. The first cleaning water inlet 26 serves as one cleaning water inlet communicating with the vicinity of the upstream side of the orifice 24 for restricting the pressure air supplied from the upstream side on the reducing agent supply path 20. A first washing water outlet 28 is provided via a communication pipe 27 that branches from the vicinity of the downstream side of the orifice 24. The first washing water outlet 28 serves as one washing water outlet communicating with the vicinity of the downstream side of the portion where the reducing agent is mixed on the downstream side of the orifice 24.

一方、上記還元剤供給経路２０の下流側には、上記オリフィス２４の下流側にて前記噴射ノズル７への接続口の上流側近傍から分岐する連通管２９を介して第２の洗浄水入口３０が設けられている。この第２の洗浄水入口３０が、上記還元剤供給経路２０上にてその上流側から供給される圧力エアを絞るオリフィス２４の下流側で上記噴射ノズル７への接続口の上流側近傍に連通する他の洗浄水入口となる。また、上記噴射ノズル７への接続口を第２の洗浄水出口３１としている。この第２の洗浄水出口３１が、上記還元剤供給経路２０の下流側にて上記噴射ノズル７への接続口である他の洗浄水出口となる。   On the other hand, on the downstream side of the reducing agent supply path 20, the second washing water inlet 30 is connected to the downstream side of the orifice 24 via a communication pipe 29 that branches from the vicinity of the upstream side of the connection port to the injection nozzle 7. Is provided. The second wash water inlet 30 communicates with the vicinity of the upstream side of the connection port to the injection nozzle 7 on the downstream side of the orifice 24 for restricting the pressure air supplied from the upstream side on the reducing agent supply path 20. It becomes the other washing water inlet. The connection port to the spray nozzle 7 is a second washing water outlet 31. The second washing water outlet 31 is another washing water outlet which is a connection port to the injection nozzle 7 on the downstream side of the reducing agent supply path 20.

そして、上記還元剤供給経路２０上にて上記オリフィス２４の下流側と上記噴射ノズル７への接続口（３１）の上流側との間に、圧力センサ３２が設けられている。この圧力センサ３２は、上記還元剤供給経路２０上での尿素水の目詰まりの有無を検出する圧力検知手段となるもので、該還元剤供給経路２０上にて上記オリフィス２４側又は噴射ノズル７側の目詰まりかを検出するようになっている。この場合、上記圧力センサ３２は、上記還元剤供給経路２０内に供給されて流れる尿素水と圧力エアの混合流体の圧力を検出する。   On the reducing agent supply path 20, a pressure sensor 32 is provided between the downstream side of the orifice 24 and the upstream side of the connection port (31) to the injection nozzle 7. The pressure sensor 32 serves as pressure detection means for detecting the presence or absence of clogging of the urea water on the reducing agent supply path 20, and the orifice 24 side or the injection nozzle 7 on the reducing agent supply path 20. It is designed to detect clogging on the side. In this case, the pressure sensor 32 detects the pressure of the mixed fluid of urea water and pressure air that is supplied into the reducing agent supply path 20 and flows.

なお、図３において、符号３３は上記貯蔵タンク９からの尿素水を還元剤供給経路２０へ圧送するポンプを示している。また、符号３４は上記ポンプ３３から送られる尿素水（還元剤）の圧力を検出する還元剤圧センサを示している。そして、符号Ｖ1，Ｖ2，Ｖ3，Ｖ4，Ｖ5，Ｖ6は還元剤供給経路２０上又は各配管上に設けられた遮断バルブを示している。また、図２において、符号３５は図３に示す第１の洗浄水出口２８に接続された排水管を示している。 In FIG. 3, reference numeral 33 denotes a pump that pumps urea water from the storage tank 9 to the reducing agent supply path 20. Reference numeral 34 denotes a reducing agent pressure sensor that detects the pressure of urea water (reducing agent) sent from the pump 33. Reference numerals V 1 , V 2 , V 3 , V 4 , V 5 , and V 6 indicate shut-off valves provided on the reducing agent supply path 20 or on each pipe. Further, in FIG. 2, reference numeral 35 denotes a drain pipe connected to the first washing water outlet 28 shown in FIG.

図３のような内部構造の還元剤供給装置８において、還元剤入口２２には図２に示す還元剤の貯蔵タンク９からの供給配管１０が接続され、圧力エア入口２３には図２に示すエアタンク１８からのエア配管が接続され、第１の洗浄水入口２６及び第２の洗浄水入口３０には図２に示す洗浄水タンク１３からの給水配管１５が接続され、第２の洗浄水出口３１には図２に示す噴射ノズル７が接続される。   In the reducing agent supply device 8 having the internal structure as shown in FIG. 3, the reducing agent inlet 22 is connected to the supply pipe 10 from the reducing agent storage tank 9 shown in FIG. 2, and the pressure air inlet 23 is shown in FIG. An air pipe from the air tank 18 is connected, and a water supply pipe 15 from the wash water tank 13 shown in FIG. 2 is connected to the first wash water inlet 26 and the second wash water inlet 30, and a second wash water outlet. An injection nozzle 7 shown in FIG.

そして、図３に示す還元剤供給装置８においてその内部の還元剤供給経路２０に析出した尿素水（還元剤）を洗浄するために、(1)第１の洗浄水入口２６と第１の洗浄水出口２８とを備えて洗浄するタイプ、(2)第１の洗浄水入口２６と第２の洗浄水出口３１とを備えて洗浄するタイプ、(3)第１の洗浄水入口２６と第１の洗浄水出口２８及び第２の洗浄水出口３１とを備えて洗浄するタイプ、(4)第２の洗浄水入口３０と第２の洗浄水出口３１とを備えて洗浄するタイプ、(5)第１の洗浄水入口２６及び第２の洗浄水入口３０と第２の洗浄水出口３１とを備えて洗浄するタイプ、の５種類の型式が構成可能である。さらに、第１の洗浄水入口２６及び第２の洗浄水入口３０と第１の洗浄水出口２８及び第２の洗浄水出口３１とを総て備えて洗浄するタイプも考えられる。   In order to wash the urea water (reducing agent) deposited on the reducing agent supply path 20 in the reducing agent supply device 8 shown in FIG. 3, (1) the first washing water inlet 26 and the first washing A type having a water outlet 28 for washing, (2) a type having a first washing water inlet 26 and a second washing water outlet 31 for washing, and (3) a first washing water inlet 26 and a first (4) A type for cleaning with a second cleaning water outlet 30 and a second cleaning water outlet 31; (5) A type for cleaning with a second cleaning water outlet 30 and a second cleaning water outlet 31; There are five types of types that can be cleaned with the first cleaning water inlet 26, the second cleaning water inlet 30, and the second cleaning water outlet 31. Further, a type in which all of the first cleaning water inlet 26 and the second cleaning water inlet 30, the first cleaning water outlet 28 and the second cleaning water outlet 31 are provided for cleaning is also conceivable.

次に、このように構成された還元剤供給装置８内における尿素水（還元剤）の洗浄動作について、図４及び図５に示すフローチャートを参照して説明する。まず、図１に示すエンジンの排気浄化装置において、エンジン１の運転による排気は、排気マニフォ−ルド２から排気管３を経由して、該排気管３内の途中に配設された酸化触媒４、及びＮＯｘの還元触媒５、更にアンモニアスリップ用酸化触媒６を通り、排気管３の端部排出口から大気中に排出される。このとき、上記排気管３の内部にてＮＯｘの還元触媒５の排気上流側に配設された噴射ノズル７から尿素水が噴射される。すなわち、図２に示す尿素水の貯蔵タンク９から供給配管１０を介して尿素水が還元剤供給装置８に供給されると共に、エアタンク１８から圧力エアが供給され、上記還元剤供給装置８の動作により圧力エアと共に尿素水が上記噴射ノズル７に供給されて、排気中に噴射供給される。   Next, a cleaning operation of urea water (reducing agent) in the reducing agent supply device 8 configured as described above will be described with reference to the flowcharts shown in FIGS. 4 and 5. First, in the engine exhaust gas purification apparatus shown in FIG. 1, exhaust gas generated by the operation of the engine 1 passes from the exhaust manifold 2 through the exhaust pipe 3 and is oxidized in the middle of the exhaust pipe 3. , And the NOx reduction catalyst 5 and further through the ammonia slip oxidation catalyst 6, the exhaust gas is discharged into the atmosphere from the end outlet of the exhaust pipe 3. At this time, urea water is injected from the injection nozzle 7 disposed on the exhaust upstream side of the NOx reduction catalyst 5 inside the exhaust pipe 3. That is, urea water is supplied from the urea water storage tank 9 shown in FIG. 2 via the supply pipe 10 to the reducing agent supply device 8 and pressure air is supplied from the air tank 18, and the operation of the reducing agent supply device 8 is performed. Thus, urea water is supplied to the injection nozzle 7 together with the pressure air, and is supplied by injection into the exhaust gas.

このとき、図３に示す還元剤供給装置８内にて還元剤供給経路２０の中間部に設けられた圧力センサ３２により、該還元剤供給経路２０内の圧力を検出し確認する（図４のステップＳ１）。このとき、上記還元剤供給経路２０の経路内圧力Ｐaの正常値は、或る所定圧力Ｐ2以上であり他の所定圧力Ｐ1以下（Ｐ2＜Ｐ1）であるとする（Ｐ2≦Ｐaの正常値≦Ｐ1）。そして、ステップＳ２で、経路内圧力Ｐaが所定圧力Ｐ1より大きいか否か判断する。 At this time, the pressure in the reducing agent supply path 20 is detected and confirmed by the pressure sensor 32 provided in the intermediate part of the reducing agent supply path 20 in the reducing agent supply apparatus 8 shown in FIG. Step S1). At this time, it is assumed that the normal value of the in-path pressure Pa of the reducing agent supply path 20 is not less than a predetermined pressure P 2 and not more than another predetermined pressure P 1 (P 2 <P 1 ) (P 2 ≦ P 1 ). Normal value of Pa ≦ P 1 ). Then, in step S2, the path in the pressure Pa is determined whether greater than a predetermined pressure P 1.

いま、経路内圧力Ｐaが所定圧力Ｐ1より大きいとすると、“YES”側に進んでステップＳ３に入り、上記還元剤供給経路２０の下流側にて噴射ノズル７側の目詰まりであると判断する。このとき、上記圧力センサ３２から図１に示すＥＣＵ１１に検出信号が送られ、噴射ノズル７側の目詰まりであると判断して制御信号が還元剤供給装置８に送り返され、還元剤の供給制御を中断する（ステップＳ４）。 If the in-path pressure Pa is greater than the predetermined pressure P 1 , the process proceeds to “YES” and enters step S3, where it is determined that the injection nozzle 7 is clogged downstream of the reducing agent supply path 20. To do. At this time, a detection signal is sent from the pressure sensor 32 to the ECU 11 shown in FIG. 1, it is judged that the injection nozzle 7 is clogged, and a control signal is sent back to the reducing agent supply device 8 to control the supply of the reducing agent. Is interrupted (step S4).

次に、上記還元剤供給装置８の内部では、いくつかの遮断バルブを閉じると共に他の遮断バルブは開いて、上記還元剤供給経路２０の下流側に洗浄水を供給して洗浄を開始する（ステップＳ５）。図３において、例えば、第１の遮断バルブＶ1と、第２の遮断バルブＶ2と、第４の遮断バルブＶ4と、第５の遮断バルブＶ5とを閉じ、第３の遮断バルブＶ3及び第６の遮断バルブＶ6のみを開いて、第２の洗浄水入口３０から洗浄水を供給し第２の洗浄水出口３１から排出する。 Next, inside the reducing agent supply device 8, some cutoff valves are closed and other cutoff valves are opened, and cleaning water is supplied to the downstream side of the reducing agent supply path 20 to start cleaning ( Step S5). In FIG. 3, for example, the first cutoff valve V 1 , the second cutoff valve V 2 , the fourth cutoff valve V 4 , and the fifth cutoff valve V 5 are closed, and the third cutoff valve V Only the third and sixth shutoff valves V 6 are opened, and the cleaning water is supplied from the second cleaning water inlet 30 and discharged from the second cleaning water outlet 31.

このとき、上記洗浄開始と同時にタイマーのカウントを開始して、洗浄動作の経過時間を検出し確認する（ステップＳ６）。そして、その経過時間Ｔaが所定時間Ｔ1より大きくなったか否か判断する（ステップＳ７）。上記の経過時間Ｔaが所定時間Ｔ1より大きくなると、“YES”側に進んで洗浄を終了する（ステップＳ８）。これにより、上記還元剤供給経路２０の下流側にて噴射ノズル７への接続口までの間に析出した尿素水を洗浄することができる。 At this time, the timer starts counting simultaneously with the start of the cleaning, and the elapsed time of the cleaning operation is detected and confirmed (step S6). Then, it is determined whether the elapsed time Ta is greater than the predetermined time T 1 (step S7). When the elapsed time Ta is greater than the predetermined time T 1, and ends the washing proceeds to "YES" side (step S8). As a result, the urea water deposited on the downstream side of the reducing agent supply path 20 up to the connection port to the injection nozzle 7 can be washed.

この状態で、上記還元剤供給装置８の内部を通常の還元剤供給の状態に復旧する。図３において、例えば、第１の遮断バルブＶ1と、第３の遮断バルブＶ3と、第４の遮断バルブＶ4とを閉じ、第２の遮断バルブＶ2及び第５の遮断バルブＶ5並びに第６の遮断バルブＶ6のみを開いて、還元剤供給経路２０の上流側から下流側まで尿素水及び圧力エアが流れるように経路を開く。これにより、上記還元剤供給装置８による還元剤の供給制御を再開する（ステップＳ９）。 In this state, the inside of the reducing agent supply device 8 is restored to a normal reducing agent supply state. In FIG. 3, for example, the first cutoff valve V 1 , the third cutoff valve V 3 , and the fourth cutoff valve V 4 are closed, and the second cutoff valve V 2 and the fifth cutoff valve V 5 are closed. In addition, only the sixth shutoff valve V 6 is opened, and the path is opened so that urea water and pressure air flow from the upstream side to the downstream side of the reducing agent supply path 20. Thereby, the supply control of the reducing agent by the reducing agent supply device 8 is resumed (step S9).

一方、図４のステップＳ２で、経路内圧力Ｐaが所定圧力Ｐ1以下であるとすると、“NO”側に進んで図５のステップＳ１２に入る。ここでは、経路内圧力Ｐaが所定圧力Ｐ2より小さいか否か判断する。 On the other hand, if the in-path pressure Pa is equal to or lower than the predetermined pressure P 1 in step S2 of FIG. 4, the process proceeds to “NO” and enters step S12 of FIG. Here, the path in the pressure Pa is determined whether or not a predetermined pressure P 2 less than or.

いま、経路内圧力Ｐaが所定圧力Ｐ2より小さいとすると、“YES”側に進んでステップＳ１３に入り、上記還元剤供給経路２０の上流側にてオリフィス２４側の目詰まりであると判断する。このとき、上記圧力センサ３２から図１に示すＥＣＵ１１に検出信号が送られ、オリフィス２４側の目詰まりであると判断して制御信号が還元剤供給装置８に送り返され、還元剤の供給制御を中断する（ステップＳ１４）。 If it is assumed that the in-path pressure Pa is smaller than the predetermined pressure P 2 , the process proceeds to “YES” and enters step S13, where it is determined that the orifice 24 is clogged upstream of the reducing agent supply path 20. . At this time, a detection signal is sent from the pressure sensor 32 to the ECU 11 shown in FIG. 1, and it is determined that the orifice 24 is clogged. The process is interrupted (step S14).

次に、上記還元剤供給装置８の内部では、いくつかの遮断バルブを閉じると共に他の遮断バルブは開いて、上記還元剤供給経路２０の上流側に洗浄水を供給して洗浄を開始する（ステップＳ１５）。図３において、例えば、第３の遮断バルブＶ3と、第５の遮断バルブＶ5と、第６の遮断バルブＶ6とを閉じ、第１の遮断バルブＶ1及び第２の遮断バルブＶ2並びに第４の遮断バルブＶ4のみを開いて、第１の洗浄水入口２６から洗浄水を供給し第１の洗浄水出口２８から排出する。 Next, inside the reducing agent supply device 8, some shutoff valves are closed and other shutoff valves are opened, and washing water is supplied to the upstream side of the reducing agent supply path 20 to start washing ( Step S15). In FIG. 3, for example, the third cutoff valve V 3 , the fifth cutoff valve V 5 , and the sixth cutoff valve V 6 are closed, and the first cutoff valve V 1 and the second cutoff valve V 2 are closed. In addition, only the fourth shutoff valve V 4 is opened, and the cleaning water is supplied from the first cleaning water inlet 26 and discharged from the first cleaning water outlet 28.

以下、図４に示すステップＳ６〜Ｓ９と全く同様にして、図５に示すステップＳ１６〜Ｓ１９が行われ、上記還元剤供給経路２０のオリフィス２４の下流側にて分岐管２１ａからの尿素水と圧力エアとが混合する部位に析出した尿素水を洗浄することができる。   Thereafter, steps S16 to S19 shown in FIG. 5 are performed in exactly the same manner as steps S6 to S9 shown in FIG. 4, and the urea water from the branch pipe 21a and the downstream side of the orifice 24 of the reducing agent supply path 20 are The urea water deposited at the site where the pressure air is mixed can be washed.

なお、上記還元剤供給経路２０内に析出した還元剤を洗浄する経路は、図４及び図５を参照して説明したものに限られず、上記還元剤が析出した部位に応じて、前述の遮断バルブＶ1，Ｖ2，Ｖ3，Ｖ4，Ｖ5，Ｖ6の開閉を適宜選択することにより、所望の経路を洗浄することができる。 The path for cleaning the reducing agent deposited in the reducing agent supply path 20 is not limited to that described with reference to FIGS. 4 and 5, and the above-described blocking is performed according to the site where the reducing agent is deposited. A desired path can be cleaned by appropriately selecting opening and closing of the valves V 1 , V 2 , V 3 , V 4 , V 5 , and V 6 .

本発明によるエンジンの排気浄化装置の実施形態を示す概念図である。It is a conceptual diagram which shows embodiment of the exhaust emission purification device of the engine by this invention. 上記エンジンの排気浄化装置の要部を示す系統図である。It is a systematic diagram which shows the principal part of the exhaust-gas purification apparatus of the said engine. 上記エンジンの排気浄化装置における還元剤供給装置の内部構造を示す断面説明図である。It is a section explanatory view showing the internal structure of the reducing agent supply device in the exhaust purification device of the engine. 上記還元剤供給装置内における還元剤の洗浄動作を説明するフローチャートである。It is a flowchart explaining the washing | cleaning operation | movement of the reducing agent in the said reducing agent supply apparatus. 同じく、上記還元剤供給装置内における還元剤の洗浄動作を説明するフローチャートである。Similarly, it is a flowchart illustrating a cleaning operation of the reducing agent in the reducing agent supply apparatus.

符号の説明Explanation of symbols

１…エンジン
３…排気管
４…酸化触媒
５…還元触媒
６…アンモニアスリップ用酸化触媒
７…噴射ノズル
８…還元剤供給装置
９…貯蔵タンク
１０…供給配管
１１…ＥＣＵ
１３…洗浄水タンク
１４…洗浄水ポンプ
１７…ヒータ
１８…エアタンク
２０…還元剤供給経路
２４…オリフィス
２６…第１の洗浄水入口
２８…第１の洗浄水出口
３０…第２の洗浄水入口
３１…第２の洗浄水出口
３２…圧力センサ DESCRIPTION OF SYMBOLS 1 ... Engine 3 ... Exhaust pipe 4 ... Oxidation catalyst 5 ... Reduction catalyst 6 ... Oxidation catalyst for ammonia slip 7 ... Injection nozzle 8 ... Reducing agent supply device 9 ... Storage tank 10 ... Supply piping 11 ... ECU
DESCRIPTION OF SYMBOLS 13 ... Wash water tank 14 ... Wash water pump 17 ... Heater 18 ... Air tank 20 ... Reducing agent supply path 24 ... Orifice 26 ... 1st wash water inlet 28 ... 1st wash water outlet 30 ... 2nd wash water inlet 31 ... second washing water outlet 32 ... pressure sensor

Claims (9)

エンジンの排気系に配設され、排気中の窒素酸化物を還元剤により還元浄化する還元触媒と、
上記排気系の排気通路内にて還元剤を上記還元触媒の排気上流側に噴射する噴射ノズルと、
この噴射ノズルに対して還元剤を供給する還元剤供給装置と、
を備えたエンジンの排気浄化装置であって、
上記還元剤供給装置内にて上記噴射ノズルに還元剤を供給する経路上での還元剤の目詰まりを検出し、その還元剤供給経路に析出した還元剤を洗浄する洗浄水を供給する洗浄水供給手段を、該還元剤供給装置に付加したことを特徴とするエンジンの排気浄化装置。 A reduction catalyst disposed in the exhaust system of the engine for reducing and purifying nitrogen oxides in the exhaust with a reducing agent;
An injection nozzle for injecting a reducing agent into the exhaust upstream side of the reduction catalyst in an exhaust passage of the exhaust system;
A reducing agent supply device for supplying a reducing agent to the injection nozzle;
An exhaust emission control device for an engine equipped with
Washing water for detecting clogging of the reducing agent on the path for supplying the reducing agent to the injection nozzle in the reducing agent supply apparatus and supplying cleaning water for cleaning the reducing agent deposited on the reducing agent supply path An exhaust emission control device for an engine, wherein supply means is added to the reducing agent supply device. 上記還元剤供給装置は、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口を備えると共に、上記絞り手段の下流側にて還元剤と混合する部位の下流側近傍に連通する洗浄水出口を備え、上記洗浄水入口に洗浄水供給手段を接続したことを特徴とする請求項１記載のエンジンの排気浄化装置。   The reducing agent supply device includes a cleaning water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path, and on the downstream side of the throttle means. 2. The engine exhaust gas purification apparatus according to claim 1, further comprising a wash water outlet communicating with the vicinity of the downstream side of the portion mixed with the reducing agent, and a wash water supply means connected to the wash water inlet. 上記還元剤供給装置は、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口を備えると共に、上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を洗浄水出口とし、上記洗浄水入口に洗浄水供給手段を接続したことを特徴とする請求項１記載のエンジンの排気浄化装置。   The reducing agent supply device includes a washing water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path, and on the downstream side of the reducing agent supply path. 2. The engine exhaust gas purification apparatus according to claim 1, wherein the connection port to the injection nozzle is a washing water outlet, and a washing water supply means is connected to the washing water inlet. 上記還元剤供給装置は、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する洗浄水入口を備えると共に、上記絞り手段の下流側にて還元剤と混合する部位の下流側近傍に連通する一の洗浄水出口を備え、かつ上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を他の洗浄水出口とし、上記洗浄水入口に洗浄水供給手段を接続したことを特徴とする請求項１記載のエンジンの排気浄化装置。   The reducing agent supply device includes a cleaning water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path, and on the downstream side of the throttle means. A cleaning water outlet communicating with the vicinity of the downstream side of the portion to be mixed with the reducing agent, and a connecting port to the injection nozzle on the downstream side of the reducing agent supply path as another cleaning water outlet, 2. The engine exhaust gas purification apparatus according to claim 1, wherein a washing water supply means is connected to the inlet. 上記還元剤供給装置は、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の下流側で上記噴射ノズルへの接続口の上流側近傍に連通する洗浄水入口を備えると共に、上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を洗浄水出口とし、上記洗浄水入口に洗浄水供給手段を接続したことを特徴とする請求項１に記載のエンジンの排気浄化装置。   The reducing agent supply device has a washing water inlet communicating with the vicinity of the upstream side of the connection port to the injection nozzle on the downstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path. 2. The engine according to claim 1, wherein a connection port to the injection nozzle is used as a cleaning water outlet at a downstream side of the reducing agent supply path, and a cleaning water supply unit is connected to the cleaning water inlet. Exhaust purification equipment. 上記還元剤供給装置は、上記還元剤供給経路上にてその上流側から供給される圧力エアを絞る絞り手段の上流側近傍に連通する一の洗浄水入口を備えると共に、上記絞り手段の下流側で上記噴射ノズルへの接続口の上流側近傍に連通する他の洗浄水入口を備え、かつ上記還元剤供給経路の下流側にて上記噴射ノズルへの接続口を洗浄水出口とし、上記一の洗浄水入口及び他の洗浄水入口に洗浄水供給手段を接続したことを特徴とする請求項１記載のエンジンの排気浄化装置。   The reducing agent supply device includes one wash water inlet communicating with the vicinity of the upstream side of the throttle means for restricting the pressure air supplied from the upstream side on the reducing agent supply path, and the downstream side of the throttle means And provided with another washing water inlet communicating in the vicinity of the upstream side of the connection port to the injection nozzle, and the connection port to the injection nozzle on the downstream side of the reducing agent supply path as a washing water outlet. 2. The engine exhaust gas purification apparatus according to claim 1, wherein a washing water supply means is connected to the washing water inlet and the other washing water inlet. 上記還元剤供給装置は、上記還元剤供給経路上にて上記絞り手段の下流側と上記噴射ノズルへの接続口の上流側との間に、還元剤の目詰まりの有無を検出する圧力検知手段を備え、上記還元剤供給経路上にて上記絞り手段側又は噴射ノズル側の目詰まりかを検出するようにしたことを特徴とする請求項１〜６記載のエンジンの排気浄化装置。   The reducing agent supply device is configured to detect pressure clogging of the reducing agent between the downstream side of the throttle unit and the upstream side of the connection port to the injection nozzle on the reducing agent supply path. The engine exhaust gas purification apparatus according to claim 1, wherein clogging on the throttle means side or the injection nozzle side is detected on the reducing agent supply path. 上記洗浄水供給手段は、洗浄水を貯留しておく洗浄水タンクと、この洗浄水タンクから送られる洗浄水を加圧して上記還元剤供給装置の洗浄水入口へ供給する洗浄水ポンプとを有することを特徴とする請求項１〜７記載のエンジンの排気浄化装置。   The washing water supply means has a washing water tank for storing the washing water, and a washing water pump that pressurizes the washing water sent from the washing water tank and supplies the washing water to the washing water inlet of the reducing agent supply device. The engine exhaust gas purification apparatus according to any one of claims 1 to 7. 上記洗浄水供給手段は、上記洗浄水タンクから送られる洗浄水を加熱するヒータをさらに備えたことを特徴とする請求項８記載のエンジンの排気浄化装置。   The engine exhaust gas purification apparatus according to claim 8, wherein the cleaning water supply means further includes a heater for heating the cleaning water sent from the cleaning water tank.
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