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JP2008169711A - Reducing agent supply device - Google Patents

Reducing agent supply device Download PDF

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Publication number
JP2008169711A
JP2008169711A JP2007001613A JP2007001613A JP2008169711A JP 2008169711 A JP2008169711 A JP 2008169711A JP 2007001613 A JP2007001613 A JP 2007001613A JP 2007001613 A JP2007001613 A JP 2007001613A JP 2008169711 A JP2008169711 A JP 2008169711A
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Prior art keywords
refrigerant
reducing agent
agent supply
engine
temperature
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Japanese (ja)
Inventor
Hiroaki Nagatomo
宏明 永友
Yoshiaki Nishijima
義明 西島
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Denso Corp
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Denso Corp
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Priority to JP2007001613A priority Critical patent/JP2008169711A/en
Priority to DE102007000666A priority patent/DE102007000666A1/en
Publication of JP2008169711A publication Critical patent/JP2008169711A/en
Pending legal-status Critical Current

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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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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
    • 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent
    • 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
    • F01N2610/1453—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)

Abstract

【課題】還元剤供給装置１において、エンジン停止後の還元剤添加弁５の温度上昇を抑制し、冷媒の気化、変性を回避することにある。
【解決手段】還元剤供給装置１によれば、ＥＣＵ６は、エンジン停止後も、還元剤供給ポンプ３を作動させてジャケット１４に冷媒を供給させ、還元剤添加弁５を冷却する。これにより、エンジン停止後も、低温の冷媒がジャケット１４に流入することができるとともに、高温になった冷媒がジャケット１４から流出することができる。このため、還元剤供給装置１において、エンジン停止後の還元剤添加弁５の温度上昇を抑制し、冷媒の気化、変性を回避することができる。
【選択図】図１An object of the present invention is to suppress a temperature rise of a reducing agent addition valve 5 after the engine is stopped in a reducing agent supply device 1 and to avoid vaporization and denaturation of a refrigerant.
According to a reducing agent supply device, an ECU 6 operates a reducing agent supply pump 3 to supply a refrigerant to a jacket 14 and cools a reducing agent addition valve 5 even after the engine is stopped. Thereby, even after the engine is stopped, the low-temperature refrigerant can flow into the jacket 14 and the high-temperature refrigerant can flow out from the jacket 14. For this reason, in the reducing agent supply apparatus 1, the temperature rise of the reducing agent addition valve 5 after the engine is stopped can be suppressed, and the vaporization and denaturation of the refrigerant can be avoided.
[Selection] Figure 1

Description

本発明は、エンジンから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 from an engine.

従来から、エンジンから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 (NOx) contained in exhaust gas from an engine 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). Purified.

ところで、この還元剤供給装置には、還元剤を噴射する還元剤添加弁が、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、噴射孔を含む還元剤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 device, there is one in which a reducing agent addition valve for injecting a reducing agent is directly attached to an exhaust pipe. In such a reducing agent supply device, a reducing agent addition valve including an injection hole is provided. The tip protrudes into the exhaust pipe. 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、エンジン運転中の還元剤添加弁は、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る。そこで、還元剤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、還元剤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 reducing agent addition valve during engine operation 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. Therefore, a reducing agent addition valve is provided with a jacket through which the refrigerant flows, and the reducing agent addition valve is cooled by circulating the refrigerant in the jacket (see, for example, Patent Document 1).

しかし、エンジンの停止に伴い冷媒の循環も停止されるため、管壁の余熱によりジャケットに滞留する冷媒が気化したり、化学変化を起こして変性したりする虞がある。特に、還元剤としての尿素水を冷媒に利用する場合、水分の気化および尿素の析出に続き、尿素樹脂の合成およびその劣化が進行し、デポジットが生成する可能性があり、さらに、冷媒循環路での気泡の残留、ジャケットの閉塞、および冷却能力の低下等の問題が生じる虞がある。
特表２００２−５０３７８３号公報 However, since the circulation of the refrigerant is stopped when the engine is stopped, the refrigerant staying in the jacket may be vaporized or denatured due to a chemical change due to residual heat of the tube wall. In particular, when urea water as a reducing agent is used as a refrigerant, the vaporization of moisture and the precipitation of urea may lead to the synthesis and deterioration of urea resin, which may generate deposits. There is a possibility that problems such as residual air bubbles, blockage of the jacket, and a decrease in cooling capacity may occur.
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、還元剤供給装置において、エンジン停止後の還元剤添加弁の温度上昇を抑制し、冷媒の気化、変性を回避することにある。   The present invention has been made to solve the above-described problems, and its object is to suppress the temperature increase of the reducing agent addition valve after the engine is stopped in the reducing agent supply device, and to evaporate and denature the refrigerant. There is to avoid.

〔請求項１の手段〕
請求項１に記載の還元剤供給装置は、エンジンからの排ガスに還元剤を供給するものである。そして、この還元剤供給装置は、所定のタンクから還元剤を吸引して吐出する還元剤供給ポンプと、排ガスが通る排気管に装着され、還元剤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とともに、冷媒による冷却を受ける還元剤添加弁と、還元剤添加弁に冷媒を循環する冷媒循環手段と、エンジンの停止後の所定の期間に、冷媒循環手段を作動させて制御する制御手段とを備える。 [Means of Claim 1]
The reducing agent supply apparatus according to claim 1 supplies the reducing agent to the exhaust gas from the engine. The reducing agent supply device is attached to a reducing agent supply pump that sucks and discharges the reducing agent from a predetermined tank and an exhaust pipe through which the exhaust gas passes, and the reducing agent discharged from the reducing agent supply pump is supplied to the exhaust pipe. Control is performed by operating the refrigerant circulation means during a predetermined period after the engine is stopped, the reducing agent addition valve that is injected into the interior and receives cooling by the refrigerant, the refrigerant circulation means that circulates the refrigerant to the reducing agent addition valve, Control means.

これにより、エンジン停止後も、低温の冷媒がジャケットに流入することができるとともに、高温になった冷媒がジャケットから流出することができる。このため、還元剤供給装置において、エンジン停止後の還元剤添加弁の温度上昇を抑制し、冷媒の気化、変性を回避することができる。   Thereby, even after the engine is stopped, the low-temperature refrigerant can flow into the jacket, and the high-temperature refrigerant can flow out from the jacket. For this reason, in a reducing agent supply apparatus, the temperature rise of the reducing agent addition valve after an engine stop can be suppressed, and the vaporization and modification | denaturation of a refrigerant | coolant can be avoided.

〔請求項２の手段〕
請求項２に記載の還元剤供給装置は、還元剤添加弁と冷媒循環手段との間を循環する冷媒の温度を検出する冷媒温度検出手段を備え、制御手段は、エンジンの停止後に冷媒温度検出手段から得られる検出値に基づいて、冷媒循環手段による冷媒の循環を停止する。
これにより、冷媒の気化、変性に影響が大きい冷媒の温度に基づいて、冷媒の循環を停止することができる。このため、還元剤供給装置において、エンジン停止後の冷媒の気化、変性の防止に対する信頼性を高めることができる。 [Means of claim 2]
The reducing agent supply device according to claim 2 includes a refrigerant temperature detecting means for detecting a temperature of the refrigerant circulating between the reducing agent addition valve and the refrigerant circulating means, and the control means detects the refrigerant temperature after the engine is stopped. The refrigerant circulation by the refrigerant circulation means is stopped based on the detection value obtained from the means.
Thereby, based on the temperature of the refrigerant | coolant which has a big influence on vaporization and modification | denaturation of a refrigerant | coolant, the circulation of a refrigerant | coolant can be stopped. For this reason, in the reducing agent supply device, it is possible to improve the reliability with respect to prevention of vaporization and modification of the refrigerant after the engine is stopped.

なお、「冷媒の循環を停止する」とは、次にエンジンを起動するまで冷媒循環手段を作動させないことを条件に冷媒循環手段の作動を停止すること、を意味するものとする。よって、冷媒循環手段を一時的に作動停止して、再度、冷媒循環手段を作動させる場合には、「冷媒の循環を停止する」ことに該当しないものとする。   Note that “stopping the circulation of the refrigerant” means that the operation of the refrigerant circulation means is stopped on the condition that the refrigerant circulation means is not operated until the engine is started next time. Therefore, when the refrigerant circulation means is temporarily deactivated and the refrigerant circulation means is activated again, it does not correspond to “stopping refrigerant circulation”.

〔請求項３の手段〕
請求項３に記載の還元剤供給装置によれば、冷媒温度検出手段は、還元剤添加弁の出側の循環路で冷媒の温度を検出する。
これにより、冷媒の循環路の内で最も冷媒温度が高く、冷媒の気化、変性が最も発生しやすいと考えられる部位、すなわち、還元剤添加弁のジャケットの冷媒温度を推定して、制御上の演算に利用することができる。このため、エンジン停止後の限られた電力供給条件のもとで、冷媒循環手段を効率的に作動させるための制御が可能になる。 [Means of claim 3]
According to the reducing agent supply device of the third aspect, the refrigerant temperature detecting means detects the temperature of the refrigerant in the circulation path on the outlet side of the reducing agent addition valve.
As a result, the temperature of the refrigerant in the circulation path of the refrigerant is highest, and the temperature at which the refrigerant is most likely to vaporize and denature, that is, the temperature of the refrigerant in the jacket of the reducing agent addition valve is estimated. It can be used for calculation. For this reason, it is possible to perform control for efficiently operating the refrigerant circulation means under the limited power supply condition after the engine is stopped.

〔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、制御手段は、冷媒温度検出手段から得られる検出値が所定の目標値よりも低くなったら、冷媒循環手段による冷媒の循環を停止する。
これにより、目標値を充分に低い値に設定すれば、冷媒循環停止後に管壁から冷媒への熱伝達が続いても、冷媒が気化、変性する温度まで昇温するのを防止できる。 [Means of claim 4]
According to the reducing agent supply apparatus of the fourth aspect, the control means stops the refrigerant circulation by the refrigerant circulation means when the detection value obtained from the refrigerant temperature detection means becomes lower than the predetermined target value.
Thus, if the target value is set to a sufficiently low value, it is possible to prevent the temperature of the refrigerant from rising to a temperature at which the refrigerant evaporates and denatures even if heat transfer from the tube wall to the refrigerant continues after the refrigerant circulation is stopped.

〔請求項５の手段〕
請求項５に記載の還元剤供給装置によれば、制御手段は、冷媒温度検出手段から得られる検出値が所定の目標値に略一致するように、冷媒循環手段による冷媒の循環を制御する。
これにより、目標値を充分に低い値に設定しなくても、適宜、冷媒循環手段の作動と作動停止とが繰り返されたり、冷媒の循環量が可変されたりして、冷媒の温度は目標値に近づく。このため、冷媒循環停止後の管壁から冷媒への熱伝達を考慮して厳密に目標値を設定する必要がなくなる。 [Means of claim 5]
According to the reducing agent supply apparatus of the fifth aspect, the control means controls the refrigerant circulation by the refrigerant circulation means so that the detection value obtained from the refrigerant temperature detection means substantially coincides with the predetermined target value.
Accordingly, even if the target value is not set to a sufficiently low value, the operation of the refrigerant circulation means is repeatedly activated and deactivated, or the amount of refrigerant circulation is varied, so that the temperature of the refrigerant becomes the target value. Get closer to. For this reason, it is not necessary to set the target value strictly in consideration of heat transfer from the tube wall to the refrigerant after the refrigerant circulation is stopped.

〔請求項６の手段〕
請求項６に記載の還元剤供給装置は、還元剤添加弁と冷媒循環手段との間を循環する冷媒の温度を検出する冷媒温度検出手段を備え、制御手段は、冷媒温度検出手段から得られる検出値に基づいてエンジンの停止後に冷媒循環手段による冷媒の循環を停止する時期を設定する。
これにより、冷媒の気化、変性に影響が大きい冷媒の温度に基づいて、冷媒の循環を停止する時期を設定することができる。このため、冷媒循環停止後に管壁から冷媒への熱伝達が続いても、冷媒が気化、変性する温度まで昇温するのを防止できる。 [Means of claim 6]
According to a sixth aspect of the present invention, there is provided a reducing agent supply device comprising refrigerant temperature detecting means for detecting the temperature of the refrigerant circulating between the reducing agent addition valve and the refrigerant circulating means, and the control means is obtained from the refrigerant temperature detecting means. Based on the detected value, the timing for stopping the circulation of the refrigerant by the refrigerant circulation means is set after the engine is stopped.
Thereby, based on the temperature of the refrigerant | coolant which has a big influence on vaporization and modification | denaturation of a refrigerant | coolant, the time which stops the circulation of a refrigerant | coolant can be set. For this reason, even if heat transfer from the tube wall to the refrigerant continues after the refrigerant circulation is stopped, it is possible to prevent the temperature of the refrigerant from rising to a temperature at which it is vaporized and denatured.

〔請求項７の手段〕
請求項７に記載の還元剤供給装置は、制御手段は、冷媒温度検出手段から得られる少なくとも２つの検出値に基づいて検出値の推移を予測し、予測の結果に応じて冷媒循環手段による冷媒の循環を停止する時期を設定する。
これにより、冷媒の温度の推移予測に基づいて冷媒の循環を停止する時期を設定することができる。このため、還元剤供給装置において、エンジン停止後の冷媒の気化、変性の防止に対する信頼性を高めることができる。 [Means of Claim 7]
In the reducing agent supply apparatus according to claim 7, the control unit predicts a transition of the detection value based on at least two detection values obtained from the refrigerant temperature detection unit, and the refrigerant by the refrigerant circulation unit according to the prediction result. Set the time to stop circulation.
Accordingly, it is possible to set the timing for stopping the circulation of the refrigerant based on the refrigerant temperature transition prediction. For this reason, in the reducing agent supply device, it is possible to improve the reliability with respect to prevention of vaporization and modification of the refrigerant after the engine is stopped.

〔請求項８の手段〕
請求項８に記載の還元剤供給装置によれば、冷媒温度検出手段から得られる検出値の推移を予測する際に用いる検出値の少なくとも１つは、エンジンの停止前の検出値である。
これにより、冷媒の温度の推移予測の精度が高まるので、還元剤供給装置において、エンジン停止後の冷媒の気化、変性の防止に対する信頼性をさらに高めることができる。 [Means of Claim 8]
According to the reducing agent supply apparatus of the eighth aspect, at least one of the detection values used when predicting the transition of the detection value obtained from the refrigerant temperature detection means is the detection value before the engine is stopped.
Thereby, since the accuracy of the transition prediction of the temperature of the refrigerant is increased, in the reducing agent supply device, it is possible to further improve the reliability with respect to prevention of vaporization and denaturation of the refrigerant after the engine is stopped.

〔請求項９の手段〕
請求項９に記載の還元剤供給装置によれば、冷媒温度検出手段は、還元剤添加弁の出側の循環路で冷媒の温度を検出する。
これにより、請求項３の手段と同様の効果を得ることができる。 [Means of Claim 9]
According to the reducing agent supply apparatus of the ninth aspect, the refrigerant temperature detecting means detects the temperature of the refrigerant in the circulation path on the outlet side of the reducing agent addition valve.
Thereby, the same effect as that of the means of claim 3 can be obtained.

〔請求項１０の手段〕
請求項１０に記載の還元剤供給装置は、エンジンの回転数を検出するエンジン回転数検出手段と、エンジンに供給される空気量を検出する空気量検出手段とを備える。そして、制御手段は、エンジン回転数検出手段から得られる検出値、および空気量検出手段から得られる検出値に基づいて、エンジンの停止後に還元剤添加弁と冷媒循環手段との間を循環する冷媒の温度の推移を予測し、予測の結果に応じて、冷媒循環手段による冷媒の循環を停止する時期を設定する。 [Means of Claim 10]
According to a tenth aspect of the present invention, there is provided a reducing agent supply device comprising an engine speed detecting means for detecting the engine speed and an air amount detecting means for detecting the amount of air supplied to the engine. Then, the control means is a refrigerant that circulates between the reducing agent addition valve and the refrigerant circulation means after the engine is stopped based on the detection value obtained from the engine speed detection means and the detection value obtained from the air amount detection means. The transition of the temperature of the refrigerant is predicted, and the timing for stopping the circulation of the refrigerant by the refrigerant circulation means is set according to the prediction result.

これにより、冷媒の温度の推移予測に必要な因子を検出するために、既存のエンジン回転数検出手段および空気量検出手段を利用することができる。このため、還元剤供給装置に、新規の検出手段を装備することなく、冷媒の温度の推移を予測することができる。   Thereby, in order to detect a factor required for the transition prediction of the temperature of the refrigerant, the existing engine speed detecting means and air amount detecting means can be used. For this reason, transition of the temperature of a refrigerant | coolant can be estimated, without equip | installing a reducing agent supply apparatus with a novel detection means.

〔請求項１１の手段〕
請求項１１に記載の還元剤供給装置は、冷媒による還元剤添加弁からの除熱量を検出する除熱量検出手段を備える。そして、制御手段は、除熱量検出手段から得られる検出値に基づいて、エンジンの停止後に還元剤添加弁と冷媒循環手段との間を循環する冷媒の温度の推移を予測し、予測の結果に応じて、冷媒循環手段による冷媒の循環を停止する時期を設定する。
これにより、冷媒による除熱量の実績に基づいて、冷媒の温度の推移を予測することができる。このため、冷媒の温度の推移予測の精度が高まるので、還元剤供給装置において、エンジン停止後の冷媒の気化、変性の防止に対する信頼性を高めることができる。 [Means of Claim 11]
The reducing agent supply apparatus according to an eleventh aspect includes a heat removal amount detecting means for detecting a heat removal amount from the reducing agent addition valve by the refrigerant. Then, the control means predicts the transition of the temperature of the refrigerant circulating between the reducing agent addition valve and the refrigerant circulation means after the engine is stopped based on the detection value obtained from the heat removal amount detection means. In response, the timing for stopping the circulation of the refrigerant by the refrigerant circulation means is set.
Thereby, transition of the temperature of a refrigerant | coolant can be estimated based on the track record of the amount of heat removal by a refrigerant | coolant. For this reason, since the accuracy of the transition prediction of the temperature of the refrigerant is increased, in the reducing agent supply device, it is possible to improve the reliability for preventing the vaporization and denaturation of the refrigerant after the engine is stopped.

〔請求項１２の手段〕
請求項１２に記載の還元剤供給装置によれば、冷媒は、還元剤であってタンクに貯留され、冷媒循環手段は、還元剤供給ポンプである。 [Means of Claim 12]
According to the reducing agent supply apparatus of the twelfth aspect, the refrigerant is a reducing agent and is stored in the tank, and the refrigerant circulating means is a reducing agent supply pump.

〔請求項１３の手段〕
請求項１３に記載の還元剤供給装置によれば、冷媒は、エンジンを冷却するためのエンジン冷却水であり、ラジエータに循環されて放熱され、冷媒循環手段は、エンジンやラジエータにエンジン冷却水を循環するウォーターポンプである。 [Means of Claim 13]
According to the reducing agent supply apparatus of the thirteenth aspect, the refrigerant is engine cooling water for cooling the engine, and is circulated to the radiator to dissipate heat, and the refrigerant circulation means supplies the engine cooling water to the engine and the radiator. A circulating water pump.

最良の形態１の還元剤供給装置は、エンジンからの排ガスに還元剤を供給するものである。そして、この還元剤供給装置は、所定のタンクから還元剤を吸引して吐出する還元剤供給ポンプと、排ガスが通る排気管に装着され、還元剤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とともに、冷媒による冷却を受ける還元剤添加弁と、還元剤添加弁に冷媒を循環する冷媒循環手段と、エンジンの停止後の所定の期間に、冷媒循環手段を作動させて制御する制御手段とを備える。   The reducing agent supply device of the best mode 1 supplies a reducing agent to exhaust gas from an engine. The reducing agent supply device is attached to a reducing agent supply pump that sucks and discharges the reducing agent from a predetermined tank and an exhaust pipe through which the exhaust gas passes, and the reducing agent discharged from the reducing agent supply pump is supplied to the exhaust pipe. Control is performed by operating the refrigerant circulation means during a predetermined period after the engine is stopped, the reducing agent addition valve that is injected into the interior and receives cooling by the refrigerant, the refrigerant circulation means that circulates the refrigerant to the reducing agent addition valve, Control means.

また、この還元剤供給装置は、還元剤添加弁と冷媒循環手段との間を循環する冷媒の温度を検出する冷媒温度検出手段を備え、制御手段は、エンジンの停止後に冷媒温度検出手段から得られる検出値に基づいて、冷媒循環手段による冷媒の循環を停止する。そして、冷媒温度検出手段は、還元剤添加弁の出側の循環路で冷媒の温度を検出し、制御手段は、冷媒温度検出手段から得られる検出値が所定の目標値よりも低くなったら、冷媒循環手段による冷媒の循環を停止する。なお、冷媒は、還元剤であってタンクに貯留され、冷媒循環手段は、還元剤供給ポンプである。   In addition, the reducing agent supply device includes a refrigerant temperature detecting unit that detects a temperature of the refrigerant circulating between the reducing agent addition valve and the refrigerant circulating unit, and the control unit is obtained from the refrigerant temperature detecting unit after the engine is stopped. Based on the detected value, the refrigerant circulation by the refrigerant circulation means is stopped. Then, the refrigerant temperature detection means detects the temperature of the refrigerant in the circulation path on the outlet side of the reducing agent addition valve, and the control means, when the detection value obtained from the refrigerant temperature detection means becomes lower than a predetermined target value, The circulation of the refrigerant by the refrigerant circulation means is stopped. The refrigerant is a reducing agent and is stored in a tank, and the refrigerant circulating means is a reducing agent supply pump.

〔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、エンジンから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 device 1 supplies a reducing agent to exhaust gas from the engine, and reduces and purifies nitrogen oxides (NOx) contained in the exhaust gas. The reducing agent is, for example, urea water, and ammonia (NH3) generated by decomposition of urea reacts with NOx by a catalyst to generate harmless nitrogen (N2) and water (H2O), thereby purifying NOx. Is done.

還元剤供給装置１は、所定のタンク２から還元剤を吸引して吐出する還元剤供給ポンプ３と、還元剤供給ポンプ３から吐出された還元剤を排気管４の内部に噴射する還元剤添加弁５と、還元剤供給ポンプ３および還元剤添加弁５の作動を制御する電子制御装置（ＥＣＵ）６とを備える。   The reducing agent supply device 1 includes a reducing agent supply pump 3 that sucks and discharges the reducing agent from a predetermined tank 2, and a reducing agent addition that injects the reducing agent discharged from the reducing agent supply pump 3 into the exhaust pipe 4. A valve 5 and an electronic control unit (ECU) 6 that controls the operation of the reducing agent supply pump 3 and the reducing agent addition valve 5 are provided.

還元剤供給ポンプ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、還元剤供給ポンプ３による還元剤の吐出圧は、レギュレータ９により規制されている。   The reducing agent supply pump 3 has, for example, a rotor on which a permanent magnet is mounted and a stator around which a coil is wound, and generates a torque by the interaction between a magnetic field generated by the permanent magnet and a current supplied to the coil. A motor (not shown) is an actuator. Then, the ECU 6 controls the energization of the coil, thereby changing the rotation speed of the brushless motor and operating the discharge amount of the reducing agent. Note that the discharge pressure of the reducing agent by the reducing agent supply pump 3 is regulated by the regulator 9.

還元剤添加弁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により還元剤供給ポンプ３から還元剤添加弁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、冷媒が流動するジャケット１４が設けられ、ジャケット１４に冷媒が循環することで還元剤添加弁５が冷却される。   The reducing agent 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 reducing agent supply pump 3 to the reducing agent addition valve 5 through 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 NOx as described above. In addition, a jacket 14 through which a refrigerant flows is provided at the distal end portion 11, and the reducing agent addition valve 5 is cooled by circulating the refrigerant 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. In view of this, the jacket 14 is provided at the tip 11 and the refrigerant is circulated through the jacket 14 to remove the heat directly transmitted from the exhaust gas and the heat transmitted through the tube wall.

なお、冷媒は、還元剤であってタンク２に貯留され、還元剤供給ポンプ３により吐出され、フィルタ１２から還元剤添加弁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（すなわち、還元剤供給ポンプ３は、還元剤添加弁５に冷媒を循環する冷媒循環手段としての機能を具備する）。そして、ジャケット１４で高温になった冷媒は、ジャケット１４からタンク２への戻り流路１７を通ってタンク２に戻される。   The refrigerant is a reducing agent, is stored in the tank 2, is discharged by the reducing agent supply pump 3, and is led to the jacket 14 by the flow path 16 that branches from the flow path 13 that goes from the filter 12 toward the reducing agent addition valve 5. (That is, the reducing agent supply pump 3 has a function as a refrigerant circulating means for circulating the refrigerant to the reducing agent addition valve 5). Then, the refrigerant having reached a high temperature in the jacket 14 is returned to the tank 2 through the return channel 17 from the jacket 14 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、各種の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。すなわち、ＥＣＵ６は、還元剤供給ポンプ３および還元剤添加弁５等の動作を制御する制御手段として機能する。   The ECU 6 is a well-known microcomputer that includes a CPU, a ROM, a RAM, and other storage devices, an input device, an output device, and the like that perform a control function and an arithmetic function. The actuator is commanded to control the drive of the device. That is, the ECU 6 functions as a control unit that controls operations of the reducing agent supply pump 3, the reducing agent addition valve 5, and the like.

また、還元剤供給装置１は、還元剤添加弁５と還元剤供給ポンプ３との間を循環する冷媒の温度を検出する冷媒温度検出手段として周知の温度センサ１９を備える。温度センサ１９は、戻り流路１７に装着され、ジャケット１４からタンク２に戻る冷媒（還元剤）の温度に応じた検出信号をＥＣＵ６に出力する。つまり、温度センサ１９は、還元剤添加弁５の出側の循環路である戻り流路１７の冷媒の温度を検出する。   Further, the reducing agent supply device 1 includes a temperature sensor 19 known as a refrigerant temperature detecting means for detecting the temperature of the refrigerant circulating between the reducing agent addition valve 5 and the reducing agent supply pump 3. The temperature sensor 19 is attached to the return flow path 17 and outputs a detection signal corresponding to the temperature of the refrigerant (reducing agent) returning from the jacket 14 to the tank 2 to the ECU 6. That is, the temperature sensor 19 detects the temperature of the refrigerant in the return flow path 17 that is the circulation path on the outlet side of the reducing agent addition valve 5.

また、ＥＣＵ６は、エンジン停止後も、還元剤供給ポンプ３に冷媒を循環させて還元剤添加弁５を冷却し、温度センサ１９から得られる検出値（つまり、ジャケット１４の出側の冷媒温度）に基づいて還元剤供給ポンプ３による冷媒の循環を停止する。すなわち、ＥＣＵ６は、温度センサ１９から得られる検出値が所定の目標値よりも低くなったら、還元剤供給ポンプ３の作動を停止して冷媒の循環を停止する。   Further, even after the engine is stopped, the ECU 6 circulates the refrigerant through the reducing agent supply pump 3 to cool the reducing agent addition valve 5, and the detected value obtained from the temperature sensor 19 (that is, the refrigerant temperature on the outlet side of the jacket 14). Based on the above, the circulation of the refrigerant by the reducing agent supply pump 3 is stopped. That is, when the detected value obtained from the temperature sensor 19 becomes lower than the predetermined target value, the ECU 6 stops the operation of the reducing agent supply pump 3 and stops the circulation of the refrigerant.

ここで、ＥＣＵ６が記憶する目標値とは、例えば、冷媒循環停止後にジャケット１４に滞留する冷媒に管壁から熱伝達されても、この冷媒が気化、変性する温度まで昇温するのを阻止できる程度に充分に低い温度である。なお、冷媒としての還元剤が尿素水の場合、尿素水の昇温が続くと、水分の気化および尿素の析出に続き、尿素樹脂の合成およびその劣化が進行し、デポジットが生成する可能性がある。そして、目標値は、少なくとも、尿素水の沸点よりも低い温度に設定される。   Here, the target value stored in the ECU 6 can prevent the temperature of the refrigerant from evaporating and denatured even if heat is transferred from the tube wall to the refrigerant staying in the jacket 14 after the refrigerant circulation is stopped. The temperature is sufficiently low. In the case where the reducing agent as the refrigerant is urea water, if the temperature of the urea water continues to rise, the vaporization of moisture and the precipitation of urea followed by the synthesis and deterioration of the urea resin, which may generate deposits. is there. The target value is set to a temperature that is at least lower than the boiling point of the urea water.

〔実施例１の制御方法〕
実施例１の還元剤供給装置１のＥＣＵ６による制御方法を、図２を用いて説明する。
まず、ステップＳ１でエンジンが停止しているか否かを判断する。そして、エンジンが停止していると判断すれば（ＹＥＳ）、ステップＳ２に進み、エンジンが停止していないと判断すれば（ＮＯ）、この制御フローを終了する。 [Control Method of Example 1]
The control method by ECU6 of the reducing agent supply apparatus 1 of Example 1 is demonstrated using FIG.
First, in step S1, it is determined whether or not the engine is stopped. If it is determined that the engine is stopped (YES), the process proceeds to step S2, and if it is determined that the engine is not stopped (NO), this control flow is terminated.

次に、ステップＳ２で温度センサ１９の検出値を取得し、ステップＳ３で取得した検出値が目標値よりも低いか否かを判断する。そして、検出値が目標値よりも低いと判断すれば、ステップＳ４に進んで冷媒の循環を停止し、検出値が目標値よりも低くないと判断すれば（ＮＯ）、この制御フローを終了する。   Next, the detection value of the temperature sensor 19 is acquired in step S2, and it is determined whether or not the detection value acquired in step S3 is lower than the target value. If it is determined that the detected value is lower than the target value, the process proceeds to step S4 to stop the circulation of the refrigerant. If it is determined that the detected value is not lower than the target value (NO), this control flow is ended. .

〔実施例１の効果〕
実施例１の還元剤供給装置１のＥＣＵ６は、エンジン停止後も、還元剤供給ポンプ３を作動させてジャケット１４に冷媒を供給させ、還元剤添加弁５を冷却する。
これにより、エンジン停止後も、低温の冷媒がジャケット１４に流入することができるとともに、高温になった冷媒がジャケット１４から流出することができる。このため、還元剤供給装置１において、エンジン停止後の還元剤添加弁５の温度上昇を抑制し、冷媒の気化、変性を回避することができる。 [Effect of Example 1]
Even after the engine is stopped, the ECU 6 of the reducing agent supply device 1 of the first embodiment operates the reducing agent supply pump 3 to supply refrigerant to the jacket 14 and cools the reducing agent addition valve 5.
Thereby, even after the engine is stopped, the low-temperature refrigerant can flow into the jacket 14 and the high-temperature refrigerant can flow out from the jacket 14. For this reason, in the reducing agent supply apparatus 1, the temperature rise of the reducing agent addition valve 5 after the engine is stopped can be suppressed, and the vaporization and denaturation of the refrigerant can be avoided.

また、還元剤供給装置１は、還元剤添加弁５と冷媒循環手段（還元剤供給ポンプ３）との間を循環する冷媒の温度を検出する冷媒温度検出手段としての温度センサ１９を備え、ＥＣＵ６は、エンジンの停止後に温度センサ１９から得られる検出値に基づいて、還元剤供給ポンプ３の作動を止めて冷媒の循環を停止する。
これにより、冷媒の気化、変性に影響が大きい冷媒の温度に基づいて、冷媒の循環を停止することができる。このため、還元剤供給装置１において、エンジン停止後の冷媒の気化、変性の防止に対する信頼性を高めることができる。なお、「冷媒の循環を停止する」の意味は、上記と同様である。 Further, the reducing agent supply device 1 includes a temperature sensor 19 as a refrigerant temperature detecting means for detecting the temperature of the refrigerant circulating between the reducing agent addition valve 5 and the refrigerant circulation means (reducing agent supply pump 3), and includes an ECU 6. Stops the circulation of the refrigerant by stopping the operation of the reducing agent supply pump 3 based on the detection value obtained from the temperature sensor 19 after the engine is stopped.
Thereby, based on the temperature of the refrigerant | coolant which has a big influence on vaporization and modification | denaturation of a refrigerant | coolant, the circulation of a refrigerant | coolant can be stopped. For this reason, in the reducing agent supply apparatus 1, it is possible to improve the reliability with respect to prevention of vaporization and denaturation of the refrigerant after the engine is stopped. The meaning of “stopping the circulation of the refrigerant” is the same as described above.

また、温度センサ１９は、還元剤添加弁５の出側の循環路である戻り流路１７の冷媒の温度を検出する。
これにより、冷媒の循環路の内で最も冷媒温度が高く、冷媒の気化、変性が最も発生しやすいと考えられる部位、すなわち、ジャケット１４の冷媒温度を推定して、制御上の演算に利用することができる。このため、エンジン停止後の限られた電力供給条件のもとで、還元剤供給ポンプ３を冷媒循環手段として効率的に作動させるための制御が可能になる。 In addition, the temperature sensor 19 detects the temperature of the refrigerant in the return flow path 17 that is a circulation path on the outlet side of the reducing agent addition valve 5.
As a result, the temperature of the refrigerant in the circulation path of the refrigerant is highest, and the portion where the vaporization and modification of the refrigerant is most likely to occur, that is, the temperature of the refrigerant in the jacket 14 is estimated and used for control computation. be able to. For this reason, the control for operating the reducing agent supply pump 3 efficiently as the refrigerant circulation means under the limited power supply condition after the engine is stopped is possible.

また、ＥＣＵ６は、温度センサ１９から得られる検出値が所定の目標値よりも低くなったら、還元剤供給ポンプ３の作動を止めて冷媒の循環を停止する。また、目標値は、冷媒循環停止後にジャケット１４に滞留する冷媒に管壁から熱伝達されても、この冷媒が気化、変性する温度まで昇温するのを阻止できる程度に充分に低い温度に設定されている。
これにより、冷媒循環停止後に管壁から冷媒への熱伝達が続いても、冷媒が気化、変性する温度まで昇温するのを防止できる。 Further, when the detected value obtained from the temperature sensor 19 becomes lower than the predetermined target value, the ECU 6 stops the operation of the reducing agent supply pump 3 and stops the circulation of the refrigerant. The target value is set to a temperature that is sufficiently low to prevent the temperature of the refrigerant from evaporating and denatured even if heat is transferred from the tube wall to the refrigerant that remains in the jacket 14 after the refrigerant circulation is stopped. Has been.
Thereby, even if heat transfer from the tube wall to the refrigerant continues after the refrigerant circulation is stopped, it is possible to prevent the temperature of the refrigerant from rising to a temperature at which the refrigerant vaporizes and denatures.

〔変形例〕
実施例１の還元剤供給装置１によれば、ＥＣＵ６は、温度センサ１９から得られる検出値が目標値よりも低くなったら、還元剤供給ポンプ３の作動を停止して冷媒の循環を停止するが、検出値が目標値に略一致するように、還元剤供給ポンプ３の作動を制御してもよい。
これにより、目標値を充分に低い値に設定しなくても、適宜、還元剤供給ポンプ３が作動と作動停止とを繰り返したり、冷媒の吐出量が可変されたりして、冷媒の温度は目標値に近づく。このため、冷媒循環停止後の管壁から冷媒への熱伝達を考慮して厳密に目標値を設定する必要がなくなる。 [Modification]
According to the reducing agent supply device 1 of the first embodiment, when the detected value obtained from the temperature sensor 19 becomes lower than the target value, the ECU 6 stops the operation of the reducing agent supply pump 3 and stops the circulation of the refrigerant. However, the operation of the reducing agent supply pump 3 may be controlled so that the detected value substantially matches the target value.
Thus, even if the target value is not set to a sufficiently low value, the reducing agent supply pump 3 is repeatedly activated and deactivated, or the refrigerant discharge amount is varied, so that the temperature of the refrigerant is set to the target value. Approaching the value. For this reason, it is not necessary to set the target value strictly in consideration of heat transfer from the tube wall to the refrigerant after the refrigerant circulation is stopped.

また、エンジン停止後に冷媒の循環を停止する時期を予め設定しておき、設定した時期が到来したら強制的に冷媒の循環を停止するようにしてもよい。
この場合、冷媒の循環を停止する時期を、エンジン停止時から充分に遅れるように設定すれば、冷媒循環停止後に管壁から冷媒への熱伝達が続いても、冷媒が気化、変性する温度まで昇温するのを防止できる。 In addition, it is also possible to set in advance a timing for stopping the circulation of the refrigerant after the engine is stopped, and forcibly stop the circulation of the refrigerant when the set time comes.
In this case, if the time for stopping the circulation of the refrigerant is set so as to be sufficiently delayed from the time when the engine is stopped, even if heat transfer from the tube wall to the refrigerant continues after the refrigerant circulation stops, the temperature until the refrigerant evaporates and denatures. It is possible to prevent the temperature from rising.

そして、設定した時期の到来とともに強制的に冷媒の循環を停止する場合、停止の時期を設定する際に、温度センサ１９から得られる２つ以上の検出値に基づいて検出値の推移を予測し、予測の結果に応じて停止の時期を設定してもよい。
これにより、冷媒の気化、変性に影響が大きい冷媒の温度の推移予測に基づいて、冷媒の循環を停止する時期を設定することができる。このため、還元剤供給装置１において、エンジン停止後の冷媒の気化、変性の防止に対する信頼性を高めることができる。 When the circulation of the refrigerant is forcibly stopped with the arrival of the set time, the transition of the detected value is predicted based on two or more detected values obtained from the temperature sensor 19 when the stop time is set. The stop time may be set according to the prediction result.
Thereby, based on the transition prediction of the temperature of the refrigerant having a large influence on the vaporization and modification of the refrigerant, it is possible to set the timing for stopping the circulation of the refrigerant. For this reason, in the reducing agent supply apparatus 1, it is possible to improve the reliability with respect to prevention of vaporization and modification of the refrigerant after the engine is stopped.

さらに、得られた検出値に基づいて検出値の推移を予測する際に、エンジン停止後の検出値とともにエンジン停止前の検出値を用いてもよい。
これにより、冷媒の温度の推移予測の精度が高まるので、還元剤供給装置１において、エンジン停止後の冷媒の気化、変性の防止に対する信頼性をさらに高めることができる。 Furthermore, when the transition of the detection value is predicted based on the obtained detection value, the detection value before the engine stop may be used together with the detection value after the engine stop.
Thereby, since the accuracy of the transition prediction of the temperature of the refrigerant is increased, the reducing agent supply apparatus 1 can further improve the reliability for preventing the vaporization and denaturation of the refrigerant after the engine is stopped.

また、エンジン停止前に得られたエンジン回転数の検出値および空気量の検出値に基づいてエンジン停止後の冷媒の温度の推移を予測し、予測の結果に応じて冷媒の循環を停止する時期を設定してもよい。
これにより、冷媒の温度の推移予測に必要な因子を検出するために、既存のエンジン回転数センサや空気量センサ等を利用することができる。このため、還元剤供給装置１に、新規のセンサを装備することなく、冷媒の温度の推移を予測することができる。 In addition, the transition of the refrigerant temperature after the engine is stopped is predicted based on the detected value of the engine speed and the detected value of the air amount obtained before the engine is stopped, and the refrigerant circulation is stopped according to the prediction result. May be set.
Thereby, in order to detect a factor required for the transition prediction of the refrigerant temperature, an existing engine speed sensor, an air amount sensor, or the like can be used. For this reason, transition of the temperature of a refrigerant | coolant can be estimated, without equip | installing the reducing agent supply apparatus 1 with a novel sensor.

また、還元剤供給装置１に、冷媒による還元剤添加弁５からの除熱量を検出する熱量センサを装備し、熱量センサから得られる検出値に基づいて冷媒の温度の推移を予測し、予測の結果に応じて冷媒の循環を停止する時期を設定してもよい。
これにより、冷媒による除熱量の実績に基づいて、冷媒の温度の推移を予測することができる。このため、冷媒の温度の推移予測の精度が高まるので、還元剤供給装置１において、エンジン停止後の冷媒の気化、変性の防止に対する信頼性を高めることができる。 In addition, the reducing agent supply device 1 is equipped with a heat quantity sensor that detects the amount of heat removed from the reducing agent addition valve 5 by the refrigerant, predicts the transition of the temperature of the refrigerant based on the detection value obtained from the heat quantity sensor, You may set the time which stops the circulation of a refrigerant | coolant according to a result.
Thereby, transition of the temperature of a refrigerant | coolant can be estimated based on the track record of the amount of heat removal by a refrigerant | coolant. For this reason, since the accuracy of the transition prediction of the temperature of the refrigerant is increased, in the reducing agent supply device 1, it is possible to improve the reliability with respect to prevention of vaporization and denaturation of the refrigerant after the engine is stopped.

また、実施例１の冷媒は還元剤であったが、冷媒として、エンジンを冷却するためのエンジン冷却水を用い、還元剤添加弁５から冷媒に伝達された熱をラジエータで放熱するようにしてもよい。この場合、冷媒循環手段は、エンジンやラジエータにエンジン冷却水を循環するウォーターポンプである。   In addition, although the refrigerant of Example 1 was a reducing agent, engine cooling water for cooling the engine was used as the refrigerant, and the heat transferred from the reducing agent addition valve 5 to the refrigerant was dissipated by the radiator. Also good. In this case, the refrigerant circulation means is a water pump that circulates engine cooling water to the engine and the radiator.

また、実施例１の冷媒循環手段は、還元剤供給ポンプ３であったが、還元剤供給ポンプ３とは別のポンプ等により、冷媒としての還元剤をジャケット１４に循環するようにしてもよい。
また、実施例１の温度センサ１９は、戻り流路１７に装着され、ジャケット１４からタンク２に戻る冷媒（還元剤）の温度を検出するものであったが、温度センサ１９をタンク２内に装着してタンク２の還元剤の温度を検出したり、温度センサ１９を流路１３または流路１６に装着して還元剤供給ポンプ３から吐出されジャケット１４に入る前の冷媒の温度を検出したりするようにしてもよい。 Further, the refrigerant circulation means of the first embodiment is the reducing agent supply pump 3, but the reducing agent as the refrigerant may be circulated to the jacket 14 by a pump or the like different from the reducing agent supply pump 3. .
Further, the temperature sensor 19 of the first embodiment is mounted on the return flow path 17 and detects the temperature of the refrigerant (reducing agent) returning from the jacket 14 to the tank 2, but the temperature sensor 19 is placed in the tank 2. It is mounted to detect the temperature of the reducing agent in the tank 2, or the temperature sensor 19 is mounted to the flow path 13 or the flow path 16 to detect the temperature of the refrigerant discharged from the reducing agent supply pump 3 and entering the jacket 14. You may make it do.

なお、設定した時期に冷媒の循環を停止する場合、冷媒循環手段をエンジン停止前からエンジン停止後において継続作動させた後に作動停止させて冷媒の循環を停止してもよく、冷媒循環手段をエンジン停止時以降において、一旦、作動停止させ、再度作動開始させた後に作動停止させて冷媒の循環を停止してもよい。   When the circulation of the refrigerant is stopped at the set time, the refrigerant circulation means may be stopped after the refrigerant circulation means is continuously operated from before the engine stop to after the engine stop to stop the refrigerant circulation. After the stop, the operation may be once stopped, the operation may be started again, and then the operation may be stopped to stop the circulation of the refrigerant.

そして、冷媒循環手段をエンジン停止時以降において、一旦、作動停止させる場合、一時的な作動停止期間における冷媒の温度の推移を把握し、把握した推移に基づいて冷媒の循環を停止する時期を設定してもよい。つまり、エンジン停止後に冷媒が循環していない状態を意図的に実現し、冷媒が循環していないときの冷媒の温度推移を把握するようにしてもよい。   If the refrigerant circulation means is once deactivated after the engine is stopped, the refrigerant temperature transition during the temporary deactivation period is grasped, and the timing for stopping the refrigerant circulation is set based on the grasped transition. May be. That is, the state in which the refrigerant is not circulated after the engine is stopped may be intentionally realized, and the temperature transition of the refrigerant when the refrigerant is not circulated may be grasped.

還元剤供給装置の構成図である。It is a block diagram of a reducing agent supply apparatus. 還元剤供給装置による制御方法を示すフローチャートである。It is a flowchart which shows the control method by a reducing agent supply apparatus.

符号の説明Explanation of symbols

１ 還元剤供給装置
２ タンク
３ 還元剤供給ポンプ（冷媒循環手段）
４ 排気管
５ 還元剤添加弁
６ ＥＣＵ（制御手段）
１７ 戻り流路（還元剤添加弁の出側の循環路）
１９ 温度センサ（冷媒温度検出手段） 1 Reducing agent supply device 2 Tank 3 Reducing agent supply pump (refrigerant circulation means)
4 exhaust pipe 5 reducing agent addition valve 6 ECU (control means)
17 Return flow path (circulation path on the outlet side of the reducing agent addition valve)
19 Temperature sensor (refrigerant temperature detection means)

Claims (13)

エンジンから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吸引して吐出する還元剤供給ポンプと、
排ガスが通る排気管に装着され、前記還元剤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とともに、冷媒による冷却を受ける還元剤添加弁と、
この還元剤添加弁に冷媒を循環する冷媒循環手段と、
前記エンジンの停止後の所定の期間に、前記冷媒循環手段を作動させて制御する制御手段とを備える還元剤供給装置。 In the reducing agent supply device that supplies the reducing agent to the exhaust gas from the engine,
A reducing agent supply pump that sucks and discharges the reducing agent from a predetermined tank;
A reducing agent addition valve mounted on an exhaust pipe through which exhaust gas passes, injects the reducing agent discharged from the reducing agent supply pump into the exhaust pipe, and receives cooling by a refrigerant;
A refrigerant circulating means for circulating the refrigerant to the reducing agent addition valve;
A reducing agent supply apparatus comprising: a control unit that operates and controls the refrigerant circulation unit during a predetermined period after the engine is stopped. 請求項１に記載の還元剤供給装置において、
前記還元剤添加弁と前記冷媒循環手段との間を循環する冷媒の温度を検出する冷媒温度検出手段を備え、
前記制御手段は、前記エンジンの停止後に前記冷媒温度検出手段から得られる検出値に基づいて、前記冷媒循環手段による冷媒の循環を停止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 1,
Refrigerant temperature detection means for detecting the temperature of the refrigerant circulating between the reducing agent addition valve and the refrigerant circulation means,
The control means stops the refrigerant circulation by the refrigerant circulation means based on a detection value obtained from the refrigerant temperature detection means after the engine is stopped. 請求項２に記載の還元剤供給装置において、
前記冷媒温度検出手段は、前記還元剤添加弁の出側の循環路で冷媒の温度を検出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,
The refrigerant temperature detecting means detects the temperature of the refrigerant in a circulation path on the outlet side of the reducing agent addition valve. 請求項２または請求項３に記載の還元剤供給装置において、
前記制御手段は、前記冷媒温度検出手段から得られる検出値が所定の目標値よりも低くなったら、前記冷媒循環手段による冷媒の循環を停止することを特徴とする還元剤供給装置。 In the reducing agent supply apparatus according to claim 2 or 3,
The control means stops the refrigerant circulation by the refrigerant circulation means when the detection value obtained from the refrigerant temperature detection means is lower than a predetermined target value. 請求項２または請求項３に記載の還元剤供給装置において、
前記制御手段は、前記冷媒温度検出手段から得られる検出値が所定の目標値に略一致するように、前記冷媒循環手段による冷媒の循環を制御することを特徴とする還元剤供給装置。 In the reducing agent supply apparatus according to claim 2 or 3,
The control means controls the refrigerant circulation by the refrigerant circulation means so that the detection value obtained from the refrigerant temperature detection means substantially coincides with a predetermined target value. 請求項１に記載の還元剤供給装置において、
前記還元剤添加弁と前記冷媒循環手段との間を循環する冷媒の温度を検出する冷媒温度検出手段を備え、
前記制御手段は、前記冷媒温度検出手段から得られる検出値に基づいて前記エンジンの停止後に前記冷媒循環手段による冷媒の循環を停止する時期を設定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 1,
Refrigerant temperature detection means for detecting the temperature of the refrigerant circulating between the reducing agent addition valve and the refrigerant circulation means,
The control means sets a timing for stopping circulation of the refrigerant by the refrigerant circulation means after the engine is stopped based on a detection value obtained from the refrigerant temperature detection means. 請求項６に記載の還元剤供給装置において、
前記制御手段は、前記冷媒温度検出手段から得られる少なくとも２つの検出値に基づいて検出値の推移を予測し、この予測の結果に応じて前記冷媒循環手段による冷媒の循環を停止する時期を設定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 6,
The control means predicts transition of the detection value based on at least two detection values obtained from the refrigerant temperature detection means, and sets a timing for stopping the circulation of the refrigerant by the refrigerant circulation means according to a result of the prediction. A reducing agent supply device. 請求項７に記載の還元剤供給装置において、
前記冷媒温度検出手段から得られる検出値の推移を予測する際に用いる検出値の少なくとも１つは、前記エンジンの停止前の検出値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 7,
At least one of the detection values used when predicting the transition of the detection value obtained from the refrigerant temperature detection means is a detection value before the engine is stopped. 請求項６ないし請求項８のいずれか１つに記載の還元剤供給装置において、
前記冷媒温度検出手段は、前記還元剤添加弁の出側の循環路で冷媒の温度を検出することを特徴とする還元剤供給装置。 In the reducing agent supply apparatus according to any one of claims 6 to 8,
The refrigerant temperature detecting means detects the temperature of the refrigerant in a circulation path on the outlet side of the reducing agent addition valve. 請求項１に記載の還元剤供給装置において、
前記エンジンの回転数を検出するエンジン回転数検出手段と、
前記エンジンに供給される空気量を検出する空気量検出手段とを備え、
前記制御手段は、前記エンジン回転数検出手段から得られる検出値、および前記空気量検出手段から得られる検出値に基づいて、前記エンジンの停止後に前記還元剤添加弁と前記冷媒循環手段との間を循環する冷媒の温度の推移を予測し、この予測の結果に応じて、前記冷媒循環手段による冷媒の循環を停止する時期を設定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 1,
Engine speed detecting means for detecting the engine speed;
Air amount detecting means for detecting the amount of air supplied to the engine,
The control means is arranged between the reducing agent addition valve and the refrigerant circulation means after the engine is stopped based on a detection value obtained from the engine speed detection means and a detection value obtained from the air amount detection means. A reducing agent supply apparatus characterized by predicting a transition of the temperature of the refrigerant circulating through the refrigerant, and setting a timing for stopping the refrigerant circulation by the refrigerant circulation means according to the result of the prediction. 請求項１に記載の還元剤供給装置において、
冷媒による前記還元剤添加弁からの除熱量を検出する除熱量検出手段を備え、
前記制御手段は、前記除熱量検出手段から得られる検出値に基づいて、前記エンジンの停止後に前記還元剤添加弁と前記冷媒循環手段との間を循環する冷媒の温度の推移を予測し、この予測の結果に応じて、前記冷媒循環手段による冷媒の循環を停止する時期を設定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 1,
A heat removal amount detecting means for detecting a heat removal amount from the reducing agent addition valve by the refrigerant;
The control means predicts the transition of the temperature of the refrigerant circulating between the reducing agent addition valve and the refrigerant circulation means after the engine is stopped based on the detection value obtained from the heat removal amount detection means, According to a prediction result, a reducing agent supply apparatus is characterized in that the time for stopping the circulation of the refrigerant by the refrigerant circulation means is set. 請求項１ないし請求項１１のいずれか１つに記載の還元剤供給装置において、
冷媒は、還元剤であって前記タンクに貯留され、
前記冷媒循環手段は、前記還元剤供給ポンプであることを特徴とする還元剤供給装置。 In the reducing agent supply device according to any one of claims 1 to 11,
The refrigerant is a reducing agent and is stored in the tank,
The reducing agent supply device, wherein the refrigerant circulation means is the reducing agent supply pump. 請求項１ないし請求項１１のいずれか１つに記載の還元剤供給装置において、
冷媒は、前記エンジンを冷却するためのエンジン冷却水であり、ラジエータに循環されて放熱され、
前記冷媒循環手段は、前記エンジンや前記ラジエータにエンジン冷却水を循環するウォーターポンプであることを特徴とする還元剤供給装置。 In the reducing agent supply device according to any one of claims 1 to 11,
The refrigerant is engine cooling water for cooling the engine, and is circulated to the radiator to dissipate heat.
The reducing agent supply apparatus according to claim 1, wherein the refrigerant circulation means is a water pump that circulates engine cooling water to the engine or the radiator.
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