JP4706660B2 - Reducing agent supply device - Google Patents

Reducing agent supply device Download PDF

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JP4706660B2
JP4706660B2 JP2007103111A JP2007103111A JP4706660B2 JP 4706660 B2 JP4706660 B2 JP 4706660B2 JP 2007103111 A JP2007103111 A JP 2007103111A JP 2007103111 A JP2007103111 A JP 2007103111A JP 4706660 B2 JP4706660 B2 JP 4706660B2
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reducing agent
flow path
heat removal
temperature
addition valve
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JP2008261247A (en
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宏明 永友
義明 西島
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Denso Corp
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Denso Corp
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    • 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 ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1426—Filtration means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Description

本発明は、エンジンの排ガスに還元剤を供給する還元剤供給装置に関する。   The present invention relates to a reducing agent supply device that supplies a reducing agent to exhaust gas of an engine.

従来から、エンジンの排ガスに含まれる窒素酸化物（ＮＯｘ）を還元して浄化するために、排ガスに還元剤を供給する還元剤供給装置が公知である。この還元剤は、例えば、尿素水であり、尿素の分解により発生するアンモニア（ＮＨ３）が、触媒によりＮＯｘと反応して無害な窒素（Ｎ２）や水（Ｈ２Ｏ）を生成することで、ＮＯｘが浄化される。 2. Description of the Related Art Conventionally, a reducing agent supply device that supplies a reducing agent to exhaust gas in order to reduce and purify nitrogen oxide (NO x ) contained in engine exhaust gas is known. This reducing agent is, for example, urea water, and ammonia (NH 3 ) generated by decomposition of urea reacts with NO x by a catalyst to generate harmless nitrogen (N 2 ) and water (H 2 O). Thus, NO x is purified.

ところで、この還元剤供給装置には、還元剤を噴射する添加弁が、排気管に直接装着されるものがあり、このような還元剤供給装置では、噴射孔を含む添加弁の先端部が排気管の内部に突出する。そして、還元剤は、直接、排ガスが通る排気管に噴射され、排気ガスと混合した後に触媒に導かれる。   By the way, in this reducing agent supply apparatus, there is an apparatus in which an addition valve for injecting the reducing agent is directly attached to the exhaust pipe. In such a reducing agent supply apparatus, the tip of the addition valve including the injection hole is exhausted. Projects into the tube. The reducing agent is directly injected into the exhaust pipe through which the exhaust gas passes, and after being mixed with the exhaust gas, is introduced to the catalyst.

このため、添加弁は、先端部が高温の排ガスに曝されて加熱され、さらに、排ガスからの受熱により高温になる管壁からも熱伝達され高温化している。そこで、添加弁に冷媒が流動するジャケットを設け、このジャケットに冷媒を循環させることで、添加弁を冷却している（例えば、特許文献１参照）。   For this reason, the tip of the addition valve is heated by being exposed to high-temperature exhaust gas, and further, heat is transferred from the tube wall that becomes high temperature by receiving heat from the exhaust gas, and the temperature is increased. Therefore, a jacket through which the refrigerant flows is provided in the addition valve, and the addition valve is cooled by circulating the refrigerant in the jacket (see, for example, Patent Document 1).

ところで、ジャケットに循環させる冷媒として、還元剤を利用する技術が考えられている。この技術によれば、還元剤と別種の液体を取り回す必要がなくなり、噴射すべき還元剤の一部を分流させてジャケットに向かわせタンクに戻すことで、簡便に添加弁の冷却系統を構成することができる。   By the way, as a refrigerant to be circulated in the jacket, a technique using a reducing agent has been considered. According to this technology, it is no longer necessary to manage a different type of liquid from the reducing agent, and a part of the reducing agent to be injected is diverted toward the jacket and returned to the tank, so that a cooling system for the addition valve can be easily configured. can do.

しかし、上記のように添加弁は高温なので、添加弁の冷却に用いられた還元剤の温度は高く、高温のままタンクに戻される。このため、タンク内の還元剤の温度が上昇し、ＮＨ３ガスが発生する虞がある。
特表２００２−５０３７８３号公報 However, since the addition valve is at a high temperature as described above, the temperature of the reducing agent used for cooling the addition valve is high and is returned to the tank while maintaining the high temperature. For this reason, the temperature of the reducing agent in the tank rises and NH 3 gas may be generated.
Japanese translation of PCT publication No. 2002-503783

本発明は、上記の問題点を解決するためになされたものであり、その目的は、エンジンの排ガスに還元剤を供給する還元剤供給装置において、タンク内の還元剤の温度上昇を抑えることにある。   The present invention has been made to solve the above-described problems, and an object of the present invention is to suppress an increase in the temperature of the reducing agent in the tank in the reducing agent supply device that supplies the reducing agent to the exhaust gas of the engine. is there.

〔請求項１の手段〕
請求項１に記載の還元剤供給装置は、エンジンの排ガスに還元剤を供給するものであり、所定のタンクから還元剤を吐出する供給ポンプと、排ガスが通る排気管に装着され、供給ポンプから吐出された還元剤を排気管の内部に噴射する添加弁と、タンクに貯留される還元剤を除熱する除熱手段とを備える。
これにより、タンク内の還元剤を除熱することができるので、エンジンの排ガスに還元剤を供給する還元剤供給装置において、タンク内の還元剤の温度上昇を抑えることができる。 [Means of Claim 1]
The reducing agent supply device according to claim 1 supplies the reducing agent to the exhaust gas of the engine. The reducing agent supply device is attached to a supply pump that discharges the reducing agent from a predetermined tank and an exhaust pipe through which the exhaust gas passes. An addition valve for injecting the discharged reducing agent into the exhaust pipe and a heat removal means for removing heat from the reducing agent stored in the tank are provided.
Thereby, since the reducing agent in the tank can be removed from heat, in the reducing agent supply device that supplies the reducing agent to the exhaust gas of the engine, an increase in the temperature of the reducing agent in the tank can be suppressed.

また、添加弁は、供給ポンプから吐出された還元剤の一部により冷却を受け、除熱手段は、添加弁の冷却に用いられた還元剤をタンクに戻すためのリターン流路に設けられている。
これにより、添加弁の冷却に用いられた還元剤を、タンクに戻す前に除熱手段により除熱することができる。このため、添加弁のジャケットからタンクに戻される還元剤の温度を下げることで、タンク内の還元剤を除熱することができる。 The addition valve is cooled by a part of the reducing agent discharged from the supply pump, and the heat removal means is provided in a return flow path for returning the reducing agent used for cooling the addition valve to the tank. Yes.
Thereby, the reducing agent used for cooling the addition valve can be removed by the heat removal means before being returned to the tank. For this reason, the reducing agent in the tank can be removed by reducing the temperature of the reducing agent returned to the tank from the jacket of the addition valve.

〔請求項２の手段〕
請求項２に記載の還元剤供給装置によれば、リターン流路は、除熱手段が配されて還元剤が除熱される除熱流路、および除熱流路に並列に設けられ除熱手段を迂回するバイパス流路を含んで構成される。そして、還元剤供給装置は、添加弁の冷却に用いられた還元剤の温度に応じて、除熱流路またはバイパス流路のいずれか一方を選択して還元剤を通過させる流路切替手段を備える。
これにより、添加弁の冷却に用いられた還元剤を必要に応じて除熱することができるので、タンク内の還元剤が過冷却されるのを防止できる。 [Means of claim 2 ]
According to the reducing agent supply apparatus of claim 2 , the return flow path is provided with a heat removal means to remove heat from the reducing agent, and the return flow path is provided in parallel with the heat removal flow path to bypass the heat removal means. A bypass flow path. The reducing agent supply device includes a channel switching unit that selects either the heat removal channel or the bypass channel and allows the reducing agent to pass therethrough according to the temperature of the reducing agent used for cooling the addition valve. .
Thereby, since the reducing agent used for cooling the addition valve can be removed as necessary, it is possible to prevent the reducing agent in the tank from being overcooled.

〔請求項３の手段〕
請求項３に記載の還元剤供給装置は、添加弁の冷却に用いられた還元剤の温度を検出する温度検出手段と、除熱流路またはバイパス流路のいずれか一方を選択して還元剤を通過させる三方切替弁とを備え、温度検出手段と三方切替弁とを含めて流路切替手段を構成する。
この手段は、流路切替手段の一形態を示すものである。 [Means of claim 3 ]
According to a third aspect of the present invention, there is provided the reducing agent supply device, wherein the temperature detecting means for detecting the temperature of the reducing agent used for cooling the addition valve, and either the heat removal flow path or the bypass flow path are selected to supply the reducing agent. A three-way switching valve is provided, and the flow path switching means is configured including the temperature detection means and the three-way switching valve.
This means shows one form of the flow path switching means.

〔請求項４の手段〕
請求項４に記載の還元剤供給装置によれば、流路切替手段は、添加弁の冷却に用いられた還元剤の温度に応じて、還元剤が除熱流路を通過するのを許容または禁止するサーモスタットである。
この手段は、流路切替手段の一形態を示すものである。 [Means of claim 4 ]
According to the reducing agent supply apparatus according to claim 4 , the flow path switching means allows or prohibits the reducing agent from passing through the heat removal flow path according to the temperature of the reducing agent used for cooling the addition valve. It is a thermostat.
This means shows one form of the flow path switching means .

最良の形態１の還元剤供給装置は、エンジンの排ガスに還元剤を供給するものであり、所定のタンクから還元剤を吐出する供給ポンプと、排ガスが通る排気管に装着され、供給ポンプから吐出された還元剤を排気管の内部に噴射する添加弁と、タンクに貯留される還元剤を除熱する除熱手段とを備える。
また、この還元剤供給装置によれば、添加弁は、供給ポンプから吐出された還元剤の一部により冷却を受け、除熱手段は、添加弁の冷却に用いられた還元剤をタンクに戻すためのリターン流路に設けられている。 The reducing agent supply device of the best mode 1 supplies the reducing agent to the exhaust gas of the engine. The reducing agent supply device is mounted on a supply pump for discharging the reducing agent from a predetermined tank and an exhaust pipe through which the exhaust gas passes, and is discharged from the supply pump. An addition valve for injecting the reduced agent into the exhaust pipe, and a heat removal means for removing heat from the reducing agent stored in the tank.
According to this reducing agent supply device, the addition valve is cooled by a part of the reducing agent discharged from the supply pump, and the heat removal means returns the reducing agent used for cooling the addition valve to the tank. Is provided in the return flow path.

最良の形態２の還元剤供給装置によれば、リターン流路は、除熱手段が配されて還元剤が除熱される除熱流路、および除熱流路に並列に設けられ除熱手段を迂回するバイパス流路を含んで構成される。そして、還元剤供給装置は、添加弁の冷却に用いられた還元剤の温度に応じて、除熱流路またはバイパス流路のいずれか一方を選択して還元剤を通過させる流路切替手段を備える。また、この還元剤供給装置は、添加弁の冷却に用いられた還元剤の温度を検出する温度検出手段と、除熱流路またはバイパス流路のいずれか一方を選択して還元剤を通過させる三方切替弁とを備え、温度検出手段と三方切替弁とを含めて流路切替手段を構成する。   According to the reducing agent supply device of the best mode 2, the return flow path is provided in parallel with the heat removal flow path in which the heat removal means is arranged to remove the heat of the reducing agent, and bypasses the heat removal means. A bypass channel is included. The reducing agent supply device includes a channel switching unit that selects either the heat removal channel or the bypass channel and allows the reducing agent to pass therethrough according to the temperature of the reducing agent used for cooling the addition valve. . The reducing agent supply device also includes a temperature detecting means for detecting the temperature of the reducing agent used for cooling the addition valve, and a three-way passage through which the reducing agent passes by selecting either the heat removal flow path or the bypass flow path. The flow path switching means includes a temperature detection means and a three-way switching valve.

最良の形態３の還元剤供給装置によれば、流路切替手段は、添加弁の冷却に用いられた還元剤の温度に応じて、還元剤が除熱流路を通過するのを許容または禁止するサーモスタットである。 According to the reducing agent supply device of the best mode 3, the flow path switching means allows or prohibits the reducing agent from passing through the heat removal flow path according to the temperature of the reducing agent used for cooling the addition valve. It is a thermostat .

〔実施例１の構成〕
実施例１の還元剤供給装置１の構成を、図１を用いて説明する。
還元剤供給装置１は、エンジンの排ガスに還元剤を供給するものであり、排ガスに含まれる窒素酸化物（ＮＯｘ）を還元して浄化する。還元剤は、例えば、尿素水であり、尿素の分解により発生するアンモニア（ＮＨ３）が、触媒によりＮＯｘと反応して無害な窒素（Ｎ２）や水（Ｈ２Ｏ）を生成することで、ＮＯｘが浄化される。 [Configuration of Example 1]
The structure of the reducing agent supply apparatus 1 of Example 1 is demonstrated using FIG.
The reducing agent supply apparatus 1 supplies a reducing agent to exhaust gas from an engine, and reduces and purifies nitrogen oxides (NO x ) contained in the exhaust gas. The reducing agent is, for example, urea water, and ammonia (NH 3 ) generated by decomposition of urea reacts with NO x by a catalyst to generate harmless nitrogen (N 2 ) and water (H 2 O). Thus, NO x is purified.

還元剤供給装置１は、所定のタンク２に貯留される還元剤を吐出する供給ポンプ３、供給ポンプ３から吐出された還元剤を排気管４の内部に噴射する添加弁５、供給ポンプ３および添加弁５の作動を制御する電子制御装置（ＥＣＵ）６等を備える。   The reducing agent supply device 1 includes a supply pump 3 that discharges the reducing agent stored in a predetermined tank 2, an addition valve 5 that injects the reducing agent discharged from the supply pump 3 into the exhaust pipe 4, a supply pump 3, and An electronic control unit (ECU) 6 for controlling the operation of the addition valve 5 is provided.

供給ポンプ３は、例えば、永久磁石が装着されたロータとコイルが巻線されたステータとを有し、永久磁石による磁界とコイルに通電される電流との相互作用によりトルクを発生するブラシレスモータ（図示せず）をアクチュエータとする。そして、ＥＣＵ６は、コイルへの通電を制御することで、ブラシレスモータの回転数を可変して還元剤の吐出量を操作する。なお、供給ポンプ３による還元剤の供給圧は、レギュレータ９により規制されている。   The supply pump 3 includes, for example, a brushless motor that has a rotor on which a permanent magnet is mounted and a stator on which a coil is wound, and generates torque by the interaction between a magnetic field generated by the permanent magnet and an electric current passed through the coil. The actuator is not shown. Then, the ECU 6 controls the energization to the coil, thereby changing the rotation speed of the brushless motor and operating the discharge amount of the reducing agent. Note that the supply pressure of the reducing agent by the supply pump 3 is regulated by the regulator 9.

添加弁５は、排ガスが通る排気管４に装着され、噴射孔を含む先端部１１は、排気管４の内部に突出する。そして、還元剤は、フィルタ１２を経由する流路１３により供給ポンプ３から添加弁５まで導かれ、直接、排気管４に噴射される。そして、噴射された還元剤は、排ガスと混合した後に触媒に導かれ、上記のようにＮＯｘを浄化する。また、先端部１１には、冷媒としての還元剤が流動するジャケット１４が設けられ、ジャケット１４に還元剤が循環することで添加弁５が冷却される。 The addition valve 5 is attached to the exhaust pipe 4 through which the exhaust gas passes, and the tip portion 11 including the injection hole projects into the exhaust pipe 4. Then, the reducing agent is guided from the supply pump 3 to the addition valve 5 by the flow path 13 passing through the filter 12 and directly injected into the exhaust pipe 4. The injected reducing agent is mixed with the exhaust gas and then guided to the catalyst to purify NO x as described above. Further, a jacket 14 through which a reducing agent as a refrigerant flows is provided at the distal end portion 11, and the addition valve 5 is cooled by circulating the reducing agent through the jacket 14.

すなわち、先端部１１は、エンジン運転中、高温の排ガスに曝されて加熱され、さらに、排ガスからの受熱により高温になる管壁からも熱伝達される。そこで、先端部１１にジャケット１４を設けて、ジャケット１４に冷媒として還元剤を循環させることで、排ガスから直接的に伝わる熱、および管壁を経由して伝わる熱を除去している。   That is, the tip portion 11 is heated by being exposed to high-temperature exhaust gas during engine operation, and further, heat is transferred from the tube wall that becomes high temperature by receiving heat from the exhaust gas. Therefore, a jacket 14 is provided at the distal end portion 11 and a reducing agent is circulated through the jacket 14 as a refrigerant to remove heat transmitted directly from the exhaust gas and heat transmitted through the tube wall.

冷媒としての還元剤は、フィルタ１２から添加弁５に向かう流路１３から分岐する流路１６によりジャケット１４に導かれる。そして、ジャケット１４で高温になった還元剤は、ジャケット１４からタンク２へ還元剤を戻すためのリターン流路１７を通ってタンク２に戻される。なお、リターン流路１７のタンク２への出口流路端に、上記のレギュレータ９が配されている。   The reducing agent as the refrigerant is guided to the jacket 14 by the flow path 16 branched from the flow path 13 from the filter 12 toward the addition valve 5. Then, the reducing agent having a high temperature in the jacket 14 is returned to the tank 2 through the return flow path 17 for returning the reducing agent from the jacket 14 to the tank 2. The regulator 9 is disposed at the outlet flow path end of the return flow path 17 to the tank 2.

ＥＣＵ６は、制御機能および演算機能を発揮するＣＰＵ、ＲＯＭおよびＲＡＭ等の記憶装置、入力装置ならびに出力装置等により構成される周知のマイクロコンピュータであり、エンジンの運転状態に応じて供給ポンプ３および添加弁５等の各種機器のアクチュエータに指令して機器の駆動制御を行うものである。   The ECU 6 is a well-known microcomputer that includes a CPU, a ROM, a RAM, and other storage devices that perform control functions and arithmetic functions, an input device, an output device, and the like. The actuators of various devices such as the valve 5 are commanded to control the drive of the devices.

また、還元剤供給装置１は、タンク２内の還元剤を除熱する除熱手段として、フィン付のヒートシンク１９を備える。ヒートシンク１９は、リターン流路１７に設けられ、添加弁５の冷媒として用いられた還元剤をタンク２に戻す前に除熱する。すなわち、ヒートシンク１９は、ジャケット１４からタンク２に戻される還元剤の温度を下げることで、タンク２内の還元剤を除熱する。   Moreover, the reducing agent supply apparatus 1 includes a finned heat sink 19 as heat removal means for removing heat from the reducing agent in the tank 2. The heat sink 19 is provided in the return flow path 17 and removes heat before the reducing agent used as the refrigerant of the addition valve 5 is returned to the tank 2. That is, the heat sink 19 removes heat from the reducing agent in the tank 2 by lowering the temperature of the reducing agent returned from the jacket 14 to the tank 2.

〔実施例１の効果〕
実施例１の還元剤供給装置１は、ジャケット１４からタンク２に戻される還元剤を除熱するヒートシンク１９をリターン流路１７に備える。
これにより、ジャケット１４からタンク２に戻される還元剤の温度を下げることで、タンク２内の還元剤を除熱することができる。このため、還元剤供給装置１においてタンク２内の還元剤の温度上昇を抑えることができる。 [Effect of Example 1]
The reducing agent supply device 1 according to the first embodiment includes a heat sink 19 for removing heat from the reducing agent returned from the jacket 14 to the tank 2 in the return flow path 17.
Thereby, the reducing agent in the tank 2 can be removed by reducing the temperature of the reducing agent returned from the jacket 14 to the tank 2. For this reason, in the reducing agent supply apparatus 1, the temperature rise of the reducing agent in the tank 2 can be suppressed.

〔実施例２〕
実施例２の還元剤供給装置１によれば、図２に示すように、リターン流路１７は、ヒートシンク１９が配されて還元剤が除熱される除熱流路２１、および除熱流路２１に並列に設けられヒートシンク１９を迂回するバイパス流路２２を含んで構成される。すなわち、リターン流路１７は、ジャケット１４からタンク２に向かう途中で除熱流路２１およびバイパス流路２２の２つに分岐し、再度、除熱流路２１とバイパス流路２２とが合流して１つのリターン流路１７となりタンク２に向かう。 [Example 2]
According to the reducing agent supply apparatus 1 of the second embodiment, as shown in FIG. 2, the return flow path 17 is in parallel with the heat removal flow path 21 where the heat sink 19 is arranged to remove heat from the reducing agent, and the heat removal flow path 21. And a bypass channel 22 that bypasses the heat sink 19. That is, the return flow path 17 branches into two of the heat removal flow path 21 and the bypass flow path 22 on the way from the jacket 14 to the tank 2, and the heat removal flow path 21 and the bypass flow path 22 join again to form 1. It becomes one return flow path 17 and goes to the tank 2.

また、還元剤供給装置１は、ジャケット１４から流出した還元剤の温度を検出する温度検出手段としての温度センサ２４を分岐前のリターン流路１７に備える。これにより、温度センサ２４は、ジャケット１４からの流出直後の還元剤の温度（すなわち、ジャケット１４の還元剤の温度）を検出し、この温度に応じた検出信号をＥＣＵ６に出力する。   Further, the reducing agent supply apparatus 1 includes a temperature sensor 24 as temperature detecting means for detecting the temperature of the reducing agent flowing out from the jacket 14 in the return flow path 17 before branching. Thus, the temperature sensor 24 detects the temperature of the reducing agent immediately after flowing out of the jacket 14 (that is, the temperature of the reducing agent in the jacket 14), and outputs a detection signal corresponding to this temperature to the ECU 6.

また、還元剤供給装置１は、分岐前のリターン流路１７と除熱流路２１とが連通する開状態と、分岐前のリターン流路１７とバイパス流路２２とが連通する閉状態とを切り替えることができる三方切替弁２５を備える。三方切替弁２５は、例えば、ＥＣＵ６からの指令に応じて作動する電磁式のアクチュエータを具備し、アクチュエータが作動することにより閉状態から開状態に切り替えられるものである。   The reducing agent supply device 1 switches between an open state in which the return flow path 17 and the heat removal flow path 21 before branching communicate with each other and a closed state in which the return flow path 17 and the bypass flow path 22 before branching communicate with each other. A three-way switching valve 25 is provided. The three-way switching valve 25 includes, for example, an electromagnetic actuator that operates in response to a command from the ECU 6, and is switched from a closed state to an open state when the actuator operates.

そして、ＥＣＵ６、温度センサ２４および三方切替弁２５は、ジャケット１４の還元剤の温度に応じて、除熱流路２１またはバイパス流路２２のいずれか一方を選択して還元剤を通過させる流路切替手段を構成する。   The ECU 6, the temperature sensor 24, and the three-way switching valve 25 select the flow path switching that allows the reducing agent to pass by selecting either the heat removal flow path 21 or the bypass flow path 22 according to the temperature of the reducing agent in the jacket 14. Configure the means.

すなわち、ＥＣＵ６は、温度センサ２４から得られる検出値（つまり、ジャケット１４の還元剤の温度の検出値）が所定の閾値よりも高いと判断すれば、三方切替弁２５のアクチュエータに指令を与えて三方切替弁２５を開状態にし、ジャケット１４で高温化した還元剤に除熱流路２１を通過させる。この結果、ジャケット１４からタンク２に戻る還元剤が除熱され、低温になった還元剤がタンク２に戻る。   That is, if the ECU 6 determines that the detection value obtained from the temperature sensor 24 (that is, the detection value of the temperature of the reducing agent in the jacket 14) is higher than a predetermined threshold value, the ECU 6 gives a command to the actuator of the three-way switching valve 25. The three-way switching valve 25 is opened, and the reducing agent heated at the jacket 14 is passed through the heat removal passage 21. As a result, the reducing agent returning from the jacket 14 to the tank 2 is removed from the heat, and the reducing agent having a low temperature returns to the tank 2.

また、ＥＣＵ６は、温度センサ２４から得られる検出値が閾値よりも低いと判断すれば、三方切替弁２５のアクチュエータへの指令の出力を停止して三方切替弁２５を閉状態にし、ジャケット１４から流出した還元剤にバイパス流路２２を通過させる。
以上の構成により、実施例２の還元剤供給装置１は、ジャケット１４から流出した還元剤の温度に応じて、還元剤の除熱を行うか否かを決めることができるので、タンク２内の還元剤が過冷却されるのを防止できる。 If the ECU 6 determines that the detection value obtained from the temperature sensor 24 is lower than the threshold value, the ECU 6 stops outputting the command to the actuator of the three-way switching valve 25 and closes the three-way switching valve 25, The reducing agent that has flowed out is passed through the bypass channel 22.
With the above configuration, the reducing agent supply apparatus 1 according to the second embodiment can determine whether or not to remove heat from the reducing agent according to the temperature of the reducing agent that has flowed out of the jacket 14. It is possible to prevent the reducing agent from being supercooled.

〔実施例３〕
実施例３の還元剤供給装置１によれば、図３に示すように、流路切替手段は、除熱流路２１に配されたサーモスタット２７である。サーモスタット２７は、温度に反応して自動的に開閉するものであり、所定の閾値よりも高い温度で開弁し、閾値よりも低い温度で閉弁する。すなわち、サーモスタット２７は、還元剤の温度が所定の閾値よりも高くなると、自動的に開弁して還元剤が除熱流路２１を通過するのを許容し、還元剤の温度が閾値よりも低くなると、自動的に閉弁して還元剤が除熱流路２１を通過するのを禁止する。 Example 3
According to the reducing agent supply device 1 of the third embodiment, the flow path switching means is a thermostat 27 disposed in the heat removal flow path 21 as shown in FIG. The thermostat 27 automatically opens and closes in response to the temperature, opens at a temperature higher than a predetermined threshold, and closes at a temperature lower than the threshold. That is, when the temperature of the reducing agent becomes higher than a predetermined threshold, the thermostat 27 automatically opens to allow the reducing agent to pass through the heat removal flow path 21, and the temperature of the reducing agent is lower than the threshold. In this case, the valve is automatically closed to prevent the reducing agent from passing through the heat removal passage 21.

〔参考例〕
参考例の還元剤供給装置１によれば、図４に示すように、ヒートシンク１９が配される除熱流路２１が、フィルタ１２よりも上流側の流路１３から分岐してタンク２に接続している。 [Reference example]
According to the reducing agent supply apparatus 1 of the reference example , as shown in FIG. 4, the heat removal flow path 21 in which the heat sink 19 is arranged branches from the flow path 13 upstream of the filter 12 and is connected to the tank 2. ing.

また、還元剤供給装置１は、タンク２に貯留される還元剤の温度を検出する温度検出手段としての温度センサ２９をタンク２に備え、タンク２内の還元剤の温度に応じた検出信号をＥＣＵ６に出力する。   In addition, the reducing agent supply apparatus 1 includes a temperature sensor 29 as temperature detecting means for detecting the temperature of the reducing agent stored in the tank 2, and a detection signal corresponding to the temperature of the reducing agent in the tank 2. It outputs to ECU6.

さらに、還元剤供給装置１は、ヒートシンク１９よりも下流側の除熱流路２１に二方弁３０を備える。二方弁３０は、例えば、ＥＣＵ６からの指令に応じて作動する電磁式のアクチュエータを具備し、アクチュエータが作動することにより開弁して除熱流路２１に還元剤を流動させるものである。
そして、ＥＣＵ６、温度センサ２９および二方弁３０は、タンク２に貯留される還元剤の温度に応じて、除熱流路２１に還元剤を通過させる除熱流路開閉手段を構成する。 Further, the reducing agent supply device 1 includes a two-way valve 30 in the heat removal flow path 21 on the downstream side of the heat sink 19. The two-way valve 30 includes, for example, an electromagnetic actuator that operates in response to a command from the ECU 6, and opens when the actuator operates to cause the reducing agent to flow through the heat removal passage 21.
The ECU 6, the temperature sensor 29, and the two-way valve 30 constitute a heat removal channel opening / closing means that allows the reducing agent to pass through the heat removal channel 21 according to the temperature of the reducing agent stored in the tank 2.

すなわち、ＥＣＵ６は、温度センサ２９から得られる検出値（つまり、タンク２内の還元剤の温度の検出値）が所定の閾値よりも高いと判断すれば、二方弁３０のアクチュエータに指令を与えて二方弁３０を開弁させ、供給ポンプ３から吐出された還元剤の一部を除熱流路２１に分流させる。この結果、供給ポンプ３から吐出された還元剤の一部が除熱され、低温のままタンク２に戻る。   That is, if the ECU 6 determines that the detected value obtained from the temperature sensor 29 (that is, the detected value of the temperature of the reducing agent in the tank 2) is higher than a predetermined threshold value, it gives a command to the actuator of the two-way valve 30. Then, the two-way valve 30 is opened, and a part of the reducing agent discharged from the supply pump 3 is divided into the heat removal passage 21. As a result, a part of the reducing agent discharged from the supply pump 3 is removed from the heat and returned to the tank 2 at a low temperature.

また、ＥＣＵ６は、温度センサ２９から得られる検出値が閾値よりも低いと判断すれば、二方弁３０のアクチュエータへの指令の出力を停止して二方弁３０を閉弁させ、除熱流路２１への分流を停止する。
以上の構成により、参考例の還元剤供給装置１は、タンク２内の還元剤の温度に応じて、還元剤の除熱を行うか否かを決めることができるので、タンク２内の還元剤が過冷却されるのを防止できる。 If the ECU 6 determines that the detected value obtained from the temperature sensor 29 is lower than the threshold value, the ECU 6 stops outputting the command to the actuator of the two-way valve 30 and closes the two-way valve 30 to remove the heat removal flow path. Stop the diversion to 21.
With the above configuration, the reducing agent supply apparatus 1 of the reference example can determine whether or not to remove heat from the reducing agent according to the temperature of the reducing agent in the tank 2. Can be prevented from being overcooled.

〔実施例４〕
実施例４の還元剤供給装置１によれば、図５に示すように、添加弁５に流入する還元剤は、添加弁５の内部で先端部１１の噴射孔に向かう流れと、ジャケット１４に向かう流れとに分岐する（このため、実施例４の還元剤供給装置１では、ジャケット１４に還元剤を導くための流路１６が不要になる）。そして、噴射孔に向かう流れと分岐した還元剤が、ジャケット１４に流入し冷媒として熱伝達を受けた後、ヒートシンク１９で除熱されてタンク２に戻る。 Example 4
According to the reducing agent supply device 1 of the fourth embodiment, as shown in FIG. 5, the reducing agent flowing into the addition valve 5 flows into the jacket 14 and the flow toward the injection hole of the tip portion 11 inside the addition valve 5. (For this reason, in the reducing agent supply apparatus 1 of the fourth embodiment, the flow path 16 for introducing the reducing agent to the jacket 14 becomes unnecessary). Then, the reducing agent branched from the flow toward the injection hole flows into the jacket 14 and receives heat transfer as a refrigerant, and then is removed by the heat sink 19 and returned to the tank 2.

〔変形例〕
実施例１〜４の還元剤供給装置１によれば、除熱手段はフィン付のヒートシンク１９であり、還元剤と外気とを熱交換させて還元剤の冷却を行うものであったが、還元剤と他の冷媒（例えば、エンジン冷却水や空調用冷媒）とを熱交換させるようにしてもよい。
また、実施例１〜４の還元剤供給装置１によれば、添加弁５のジャケット１４に還元剤が供給され、添加弁５は還元剤を冷媒として冷却されていたが、図６に示すように、エンジン冷却水等の還元剤とは別種の冷媒をジャケット１４に供給して添加弁５を冷却してもよい。 [Modification]
According to the reducing agent supply apparatus 1 of Examples 1 to 4, the heat removal means is the heat sink 19 with fins, and the reducing agent is cooled by exchanging heat between the reducing agent and the outside air. You may make it heat-exchange the agent and other refrigerant | coolants (for example, engine cooling water or an air-conditioning refrigerant).
Moreover, according to the reducing agent supply apparatus 1 of Examples 1 to 4 , the reducing agent was supplied to the jacket 14 of the addition valve 5, and the addition valve 5 was cooled using the reducing agent as a refrigerant, as shown in FIG. In addition, the addition valve 5 may be cooled by supplying a coolant different from the reducing agent such as engine cooling water to the jacket 14 .

また、実施例４の還元剤供給装置１によれば、添加弁５に流入する還元剤は、添加弁５の内部で先端部１１の噴射孔に向かう流れと、ジャケット１４に向かう流れとに分岐したが、流路１３をジャケット１４に接続して還元剤の全量を先にジャケット１４に流入させ、ジャケット１４において噴射孔に向かう流れを分岐させてもよい。 Further, according to the reducing agent supply device 1 of the fourth embodiment, the reducing agent flowing into the addition valve 5 branches into a flow toward the injection hole of the tip portion 11 and a flow toward the jacket 14 inside the addition valve 5. However, the flow path 13 may be connected to the jacket 14 so that the entire amount of the reducing agent flows into the jacket 14 first, and the flow toward the injection hole in the jacket 14 may be branched.

還元剤供給装置の構成図である（実施例１）。It is a block diagram of a reducing agent supply apparatus (Example 1). 還元剤供給装置の構成図である（実施例２）。(Example 2) which is a block diagram of a reducing agent supply apparatus. 還元剤供給装置の構成図である（実施例３）。(Example 3) which is a block diagram of a reducing agent supply apparatus. 還元剤供給装置の構成図である（参考例）。It is a block diagram of a reducing agent supply apparatus ( reference example ). 還元剤供給装置の構成図である（実施例４）。It is a block diagram of a reducing agent supply apparatus (Example 4 ). 還元剤供給装置の構成図である（変形例）。It is a block diagram of a reducing agent supply apparatus (modification example).

１ 還元剤供給装置
２ タンク
３ 供給ポンプ
４ 排気管
５ 添加弁
６ ＥＣＵ（流路切替手段、除熱流路開閉手段）
１３ 流路（供給ポンプから添加弁に還元剤を導く流路）
１７ リターン流路
１９ ヒートシンク（除熱手段）
２１ 除熱流路
２２ バイパス流路
２４ 温度センサ（温度検出手段、流路切替手段）
２５ 三方切替弁（流路切替手段）
２７ サーモスタット（流路切替手段） DESCRIPTION OF SYMBOLS 1 Reducing agent supply apparatus 2 Tank 3 Supply pump 4 Exhaust pipe 5 Addition valve 6 ECU (flow path switching means, heat removal flow path opening / closing means)
13 flow path (flow path for introducing the reducing agent from the supply pump to the addition valve)
17 Return channel 19 Heat sink (heat removal means)
21 Heat removal flow path 22 Bypass flow path 24 Temperature sensor (temperature detection means, flow path switching means)
25 Three-way switching valve (channel switching means)
27 Thermostat (Channel switching means )

Claims (4)

エンジンの排ガスに還元剤を供給する還元剤供給装置において、
所定のタンクから還元剤を吐出する供給ポンプと、
排ガスが通る排気管に装着され、前記供給ポンプから吐出された還元剤を前記排気管の内部に噴射する添加弁と、
前記タンクに貯留される還元剤を除熱する除熱手段とを備え、
前記添加弁は、前記供給ポンプから吐出された還元剤の一部により冷却を受け、
前記除熱手段は、前記添加弁の冷却に用いられた還元剤を前記タンクに戻すためのリターン流路に設けられていることを特徴とする還元剤供給装置。 In the reducing agent supply device that supplies the reducing agent to the exhaust gas of the engine,
A supply pump for discharging a reducing agent from a predetermined tank;
An addition valve that is attached to an exhaust pipe through which exhaust gas passes and injects a reducing agent discharged from the supply pump into the exhaust pipe;
A heat removal means for removing heat from the reducing agent stored in the tank ,
The addition valve is cooled by a part of the reducing agent discharged from the supply pump,
The reductant supply device , wherein the heat removal means is provided in a return flow path for returning the reductant used for cooling the addition valve to the tank . 請求項１に記載の還元剤供給装置において、
前記リターン流路は、前記除熱手段が配されて還元剤が除熱される除熱流路、およびこの除熱流路に並列に設けられ前記除熱手段を迂回するバイパス流路を含んで構成され、
前記添加弁の冷却に用いられた還元剤の温度に応じて、前記除熱流路または前記バイパス流路のいずれか一方を選択して還元剤を通過させる流路切替手段を備えることを特徴とする還元剤供給装置。 The reducing agent supply apparatus according to claim 1,
The return flow path includes a heat removal flow path in which the heat removal means is arranged to remove heat from the reducing agent, and a bypass flow path that is provided in parallel to the heat removal flow path and bypasses the heat removal means.
A flow path switching means is provided that selects either the heat removal flow path or the bypass flow path according to the temperature of the reducing agent used for cooling the addition valve and allows the reducing agent to pass therethrough. Reducing agent supply device. 請求項２に記載の還元剤供給装置において、
前記添加弁の冷却に用いられた還元剤の温度を検出する温度検出手段と、
前記除熱流路または前記バイパス流路のいずれか一方を選択して還元剤を通過させる三方切替弁とを備え、
前記温度検出手段と前記三方切替弁とを含めて前記流路切替手段を構成することを特徴とする還元剤供給装置。 The reducing agent supply apparatus according to claim 2,
Temperature detecting means for detecting the temperature of the reducing agent used for cooling the addition valve;
A three-way switching valve that allows either one of the heat removal flow path or the bypass flow path to pass through a reducing agent;
A reducing agent supply device comprising the flow rate switching means including the temperature detection means and the three-way switching valve . 請求項２に記載の還元剤供給装置において、
前記流路切替手段は、前記添加弁の冷却に用いられた還元剤の温度に応じて、還元剤が前記除熱流路を通過するのを許容または禁止するサーモスタットであることを特徴とする還元剤供給装置。 The reducing agent supply apparatus according to claim 2 ,
The flow path switching means is a thermostat that allows or prohibits the reducing agent from passing through the heat removal flow path according to the temperature of the reducing agent used for cooling the addition valve. Feeding device .
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