JP2014148960A - Vehicle exhaust purification device - Google Patents

Vehicle exhaust purification device Download PDF

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JP2014148960A
JP2014148960A JP2013019502A JP2013019502A JP2014148960A JP 2014148960 A JP2014148960 A JP 2014148960A JP 2013019502 A JP2013019502 A JP 2013019502A JP 2013019502 A JP2013019502 A JP 2013019502A JP 2014148960 A JP2014148960 A JP 2014148960A
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catalyst
casing
temperature
exhaust
vehicle
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JP6098797B2 (en
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Kiyoka Tsunekawa
希代香 恒川
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Mitsubishi Motors Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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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  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

PROBLEM TO BE SOLVED: To accurately perform reduction agent addition control when a catalyst temperature decreases through accurate temperature detection of an exhaust purification catalyst separately installed at a plurality of locations on a vehicle.SOLUTION: A vehicle exhaust purification device comprises: a urea water injector 10 which injects urea water into an exhaust pipe 2 of a vehicle engine 1; a selective reduction type catalyst 12 arranged at a downstream side of the urea water injector 10; a second temperature sensor 36 which detects a catalyst temperature of the selective reduction type catalyst 12; and a urea water supply control unit 40 which controls operation of a urea water injection valve 10 on the basis of the catalyst temperature detected by the second temperature sensor 36. The selective reduction type catalyst 12 is separately installed at a plurality of locations on a vehicle in a manner that stores: a first catalyst carrier 31 and a second catalyst carrier 32 in a first casing 21; and a third catalyst carrier 33 in a second casing 22. The second temperature sensor 36 is installed in the second casing 22 and detects a temperature of exhaust passing through the third catalyst carrier 33 as the catalyst temperature.

Description

本発明は、車両の排気浄化装置に係り、詳しくは、エンジンの排気通路に設けられた温度センサの搭載位置に関する。   The present invention relates to an exhaust emission control device for a vehicle, and more particularly to a mounting position of a temperature sensor provided in an exhaust passage of an engine.

車両のエンジンの排気通路には、排気を浄化するための排気浄化装置が備えられている。例えばディーゼルエンジンの排気通路には、ディーゼルパティキュレートフィルタが搭載され、排気中のＰＭ（粒子状物質）を捕集する機能を有する。更に、ディーゼルパティキュレートフィルタの上流側に酸化触媒を備え、酸化触媒に燃料を供給して燃焼させ、排気温度を上昇させ、ディーゼルパティキュレートフィルタに捕集されたＰＭを燃焼除去するものが知られている。更に、ディーゼルエンジンの排気通路には、尿素水等の還元剤を用いて排気中のＮＯxを還元除去する選択還元型触媒が備えられているものもある。   An exhaust gas purification device for purifying exhaust gas is provided in an exhaust passage of a vehicle engine. For example, a diesel particulate filter is mounted in the exhaust passage of a diesel engine and has a function of collecting PM (particulate matter) in the exhaust. Furthermore, an oxidation catalyst is provided on the upstream side of the diesel particulate filter, fuel is supplied to the oxidation catalyst and burnt, the exhaust temperature is raised, and PM collected by the diesel particulate filter is burned and removed. ing. Furthermore, some diesel engine exhaust passages are provided with a selective reduction catalyst that reduces and removes NOx in the exhaust gas using a reducing agent such as urea water.

例えば、特許文献１には、排気通路の上流側から順番に酸化触媒、ディーゼルパティキュレートフィルタ、選択還元型触媒を介装したディーゼルエンジンが開示されている。また、特許文献１では、酸化触媒とディーゼルパティキュレートフィルタは１つのケーシング内に収納され、選択還元型触媒は、他のケーシング内に収納されている。
更に、選択還元型触媒には、触媒温度を検出する温度検出手段が搭載されており、例えば選択還元型触媒の低温時に還元剤の供給を規制する制御を行うものもある。 For example, Patent Document 1 discloses a diesel engine including an oxidation catalyst, a diesel particulate filter, and a selective reduction catalyst in order from the upstream side of the exhaust passage. In Patent Document 1, the oxidation catalyst and the diesel particulate filter are housed in one casing, and the selective reduction catalyst is housed in another casing.
Furthermore, the selective reduction type catalyst is equipped with a temperature detecting means for detecting the catalyst temperature, and for example, there is a type that controls the supply of the reducing agent at a low temperature of the selective reduction type catalyst.

特開２０１０−７１１９５号公報JP 2010-71195 A

しかしながら、車両に搭載される選択還元型触媒は比較的大容量を必要とし、搭載スペースの制限から複数に分割して配置される場合が多い。
このように複数の選択還元型触媒が搭載されている場合には、全ての選択還元型触媒が活性状態であるか否かを１つの温度検出手段で検出することが困難である。したがって、未活性状態の選択還元型触媒があるにも拘わらず還元剤を無駄に噴射してしまう虞があり、還元剤の消費量増加を招いてしまう。あるいは、温度検出手段を選択還元型触媒毎に多く搭載しなければならず、部品点数及び部品コストの増加を招くといった問題点がある。 However, the selective catalytic reduction catalyst mounted on the vehicle requires a relatively large capacity, and is often divided into a plurality of parts due to the limitation of the mounting space.
When a plurality of selective catalytic reduction catalysts are mounted in this way, it is difficult to detect whether or not all the selective catalytic reduction catalysts are in an active state with a single temperature detection means. Therefore, there is a possibility that the reducing agent is unnecessarily injected despite the presence of the selective reduction catalyst in the inactive state, leading to an increase in the amount of reducing agent consumed. Alternatively, a large number of temperature detection means must be mounted for each selective reduction catalyst, which causes a problem that the number of parts and part cost increase.

本発明はこのような問題点を解決するためになされたもので、車両に複数分割して搭載された排気浄化触媒の触媒温度を１つの温度検出手段で検出して、適切な還元剤の供給が可能な車両の排気浄化装置を提供することにある。   The present invention has been made to solve such a problem, and detects the catalyst temperature of an exhaust purification catalyst mounted in a plurality of parts in a vehicle by a single temperature detecting means, and supplies an appropriate reducing agent. It is an object of the present invention to provide an exhaust emission control device for a vehicle.

上記の目的を達成するために、請求項１の発明では、車両に搭載されたエンジンの排気通路に設けられ、当該排気通路内に還元剤を供給する還元剤供給手段と、還元剤供給手段の下流側の排気通路に設けられ、排気通路内の排気に含まれる窒素酸化物を還元剤供給手段により供給された還元剤により還元浄化する排気浄化触媒と、排気浄化触媒の触媒温度を検出する触媒温度検出手段と、触媒温度検出手段により検出された触媒温度に基づいて還元剤供給手段の作動を制御する還元剤供給制御手段と、を備えた車両の排気浄化装置であって、排気浄化触媒は、第１のケーシング内に排気流通方向に沿って直列に収納された第１の触媒担体及び第２の触媒担体と、第１のケーシングの下流側に離間して配置された第２のケーシング内に収納された第３の触媒担体を有し、触媒温度検出手段は、第１のケーシングの下流に設置され、第３の触媒担体の温度を触媒温度として検出することを特徴とする。   In order to achieve the above object, according to the first aspect of the present invention, there is provided a reducing agent supply means provided in an exhaust passage of an engine mounted on a vehicle, for supplying a reducing agent into the exhaust passage, and a reducing agent supply means. An exhaust purification catalyst that is provided in the downstream exhaust passage and that reduces and purifies nitrogen oxides contained in the exhaust gas in the exhaust passage by the reducing agent supplied by the reducing agent supply means, and a catalyst that detects the catalyst temperature of the exhaust purification catalyst An exhaust purification device for a vehicle, comprising: a temperature detection means; and a reducing agent supply control means for controlling the operation of the reducing agent supply means based on the catalyst temperature detected by the catalyst temperature detection means. In the first casing, the first catalyst carrier and the second catalyst carrier housed in series along the exhaust flow direction, and in the second casing spaced apart on the downstream side of the first casing Stored in A third catalyst carrier, the catalyst temperature detecting means is disposed downstream of the first casing, the temperature of the third catalyst carriers and detecting a catalyst temperature.

また、請求項２の発明では、請求項１において、触媒温度検出手段は、第３の触媒担体の下流側に配置され、第３の触媒担体を通過した排気の温度を触媒温度として検出することを特徴とする。
また、請求項３の発明では、請求項１において、第２のケーシング内に、排気浄化触媒の一部を構成する第４の触媒担体が収納されて、第３の触媒担体の下流側に配置され、触媒温度検出手段は、第４の触媒担体の下流側に配置され、第４の触媒担体を通過した排気の温度を触媒温度として検出することを特徴とする。 According to a second aspect of the present invention, in the first aspect, the catalyst temperature detecting means is disposed downstream of the third catalyst carrier and detects the temperature of the exhaust gas that has passed through the third catalyst carrier as the catalyst temperature. It is characterized by.
According to a third aspect of the present invention, in the first aspect, the fourth catalyst carrier constituting a part of the exhaust purification catalyst is accommodated in the second casing, and is disposed downstream of the third catalyst carrier. The catalyst temperature detecting means is arranged downstream of the fourth catalyst carrier and detects the temperature of the exhaust gas that has passed through the fourth catalyst carrier as the catalyst temperature.

また、請求項４の発明では、請求項１から３のいずれか１項において、第１のケーシング及び第２のケーシングは、車両のフロア下を車両左右方向に延びるクロスメンバを、前後に挟んで配置されることを特徴とする。
また、請求項５の発明では、請求項４において、第１のケーシングと第２のケーシングとの間の排気通路は、第１のケーシング及び第２のケーシングよりも流路断面積が小さく形成されていることを特徴とする。 According to a fourth aspect of the present invention, in any one of the first to third aspects, the first casing and the second casing sandwich a cross member extending in the left-right direction of the vehicle under the vehicle floor. It is characterized by being arranged.
According to a fifth aspect of the present invention, in the fourth aspect, the exhaust passage between the first casing and the second casing is formed to have a smaller channel cross-sectional area than the first casing and the second casing. It is characterized by.

本発明の請求項１の車両の排気浄化装置によれば、排気浄化触媒が第１のケーシング内に収納される第１の触媒担体及び第２の触媒担体と、第２のケーシング内に収納される第３の触媒担体に分割されるので、設置スペースの限られた車両に搭載された排気浄化触媒の容量を増加させることができる。
そして、このように排気浄化触媒が第１の触媒担体、第２の触媒担体及び第３の触媒担体に分割されて排気通路に直列に配置された構成において、エンジンから遠く最も低温になる最下流の第３の触媒担体の温度を触媒温度として検出して、この触媒温度に基づいて還元剤の供給制御が行われるので、触媒温度の低い部分に合わせた還元剤の供給が可能となる。したがって、還元剤の無駄な消費を抑制するとともに、排気浄化触媒からの還元剤の流出を抑制することができる。 According to the exhaust emission control device for a vehicle of claim 1 of the present invention, the exhaust purification catalyst is accommodated in the first casing, the second catalyst support, and the second casing, which are accommodated in the first casing. Therefore, the capacity of the exhaust purification catalyst mounted on the vehicle having a limited installation space can be increased.
In the configuration in which the exhaust purification catalyst is divided into the first catalyst carrier, the second catalyst carrier, and the third catalyst carrier and arranged in series in the exhaust passage in this way, the most downstream side that is farthest from the engine and has the lowest temperature. Since the temperature of the third catalyst carrier is detected as the catalyst temperature, and the supply control of the reducing agent is performed based on the catalyst temperature, the reducing agent can be supplied in accordance with the portion where the catalyst temperature is low. Therefore, wasteful consumption of the reducing agent can be suppressed and outflow of the reducing agent from the exhaust purification catalyst can be suppressed.

本発明の請求項２の車両の排気浄化装置によれば、触媒温度検出手段が第３の触媒担体の下流側に配置され、第３の触媒担体を通過した排気の温度を検出することで、第３の触媒担体の温度を正確に検出することができ、よって触媒温度を正確に検出して、還元剤添加規制手段による還元剤の添加の規制を精度良く行うことができる。
本発明の請求項３の車両の排気浄化装置によれば、第２のケーシング内に第３の触媒担体及び第４の触媒担体が収納され、触媒温度検出手段が第４の触媒担体の下流側に配置され、第４の触媒担体を通過した排気の温度を検出することで、第４の触媒担体の温度を正確に検出することができる。よって、第１の触媒担体から第４の触媒担体のうち最も低温の触媒の温度を検出することができ、還元剤添加規制手段による還元剤の添加の規制を精度良く行うことができる。 According to the exhaust emission control device for a vehicle according to claim 2 of the present invention, the catalyst temperature detecting means is disposed downstream of the third catalyst carrier, and detects the temperature of the exhaust gas that has passed through the third catalyst carrier, It is possible to accurately detect the temperature of the third catalyst carrier, and thus it is possible to accurately detect the catalyst temperature and to accurately control the addition of the reducing agent by the reducing agent addition restricting means.
According to the exhaust emission control device for a vehicle of claim 3 of the present invention, the third catalyst carrier and the fourth catalyst carrier are housed in the second casing, and the catalyst temperature detecting means is located downstream of the fourth catalyst carrier. The temperature of the fourth catalyst carrier can be accurately detected by detecting the temperature of the exhaust gas that has been disposed in the cylinder and passed through the fourth catalyst carrier. Therefore, the temperature of the lowest catalyst among the first to fourth catalyst carriers can be detected, and the addition of the reducing agent by the reducing agent addition regulating means can be regulated with high accuracy.

本発明の請求項４の車両の排気浄化装置によれば、排気浄化触媒が、第１のケーシングに収納される触媒担体と、第２のケーシングに収納される触媒担体に分割されて、クロスメンバを挟むように車両に搭載されるので、クロスメンバの前後のスペースを利用して車両に大容量の排気浄化触媒を搭載することができ、車両のエンジンの排気浄化性能を向上させることができる。   According to the exhaust purification device for a vehicle of claim 4 of the present invention, the exhaust purification catalyst is divided into a catalyst carrier housed in the first casing and a catalyst carrier housed in the second casing, and the cross member Since the vehicle is mounted so as to sandwich the exhaust gas, a large-capacity exhaust purification catalyst can be mounted on the vehicle using the space before and after the cross member, and the exhaust purification performance of the engine of the vehicle can be improved.

本発明の請求項５の車両の排気浄化装置によれば、第１のケーシングと第２のケーシングとの間の排気通路は、第１のケーシング及び第２のケーシングよりも流路断面積が小さく形成されているので、第１のケーシングを通過した排気がケーシング間の排気通路で混合して、第２のケーシングに流入するので、第２のケーシング内の触媒担体での排気浄化効率を向上させることができる。   According to the exhaust emission control device for a vehicle of claim 5 of the present invention, the exhaust passage between the first casing and the second casing has a flow passage cross-sectional area smaller than that of the first casing and the second casing. Since the exhaust gas that has passed through the first casing is mixed in the exhaust passage between the casings and flows into the second casing, the exhaust purification efficiency in the catalyst carrier in the second casing is improved. be able to.

本発明の第１の実施形態におけるディーゼルエンジンの排気系の概略構成図である。It is a schematic block diagram of the exhaust system of the diesel engine in the 1st Embodiment of this invention. 本発明の第２の実施形態における温度検出手段の設置位置を示す説明図である。It is explanatory drawing which shows the installation position of the temperature detection means in the 2nd Embodiment of this invention. 本発明の第３の実施形態における温度検出手段の設置位置を示す説明図である。It is explanatory drawing which shows the installation position of the temperature detection means in the 3rd Embodiment of this invention. 本発明の第４の実施形態における温度検出手段の設置位置を示す説明図である。It is explanatory drawing which shows the installation position of the temperature detection means in the 4th Embodiment of this invention.

以下、図面に基づき本発明の実施形態について説明する。
図１は、本発明の排気浄化装置が適用された第１の実施形態のディーゼルエンジン（以下、エンジン１という）の排気系の概略構成図である。
エンジン１は、走行駆動源として車両に搭載されている。エンジン１の排気通路である排気管２には、上流側から順番に、排気中の炭化水素を酸化させる酸化触媒３、排気中のＰＭ（粒子状物質）を捕集するディーゼルパティキュレートフィルタ４及び尿素還元式排気浄化システム５が設けられている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of an exhaust system of a diesel engine (hereinafter referred to as an engine 1) according to a first embodiment to which an exhaust emission control device of the present invention is applied.
The engine 1 is mounted on a vehicle as a travel drive source. An exhaust pipe 2 that is an exhaust passage of the engine 1 includes, in order from the upstream side, an oxidation catalyst 3 that oxidizes hydrocarbons in exhaust, a diesel particulate filter 4 that collects PM (particulate matter) in exhaust, and A urea reduction exhaust purification system 5 is provided.

尿素還元式排気浄化システム５は、排気中に還元剤として尿素水を噴射供給する尿素水インジェクタ１０(還元剤供給手段)と、尿素水インジェクタ１０から噴射供給する尿素水を貯留する尿素水タンク１１と、尿素水インジェクタ１０の下流側の排気通路に設けられた選択還元型触媒１２（排気浄化触媒）とにより構成されている。
選択還元型触媒１２は、尿素水から発生したアンモニアにより排気中のＮＯxを窒素と水に分解する機能を有する。 The urea reduction exhaust purification system 5 includes a urea water injector 10 (reducing agent supply means) for injecting and supplying urea water as a reducing agent in exhaust gas, and a urea water tank 11 for storing urea water to be injected and supplied from the urea water injector 10. And a selective reduction catalyst 12 (exhaust gas purification catalyst) provided in the exhaust passage on the downstream side of the urea water injector 10.
The selective catalytic reduction catalyst 12 has a function of decomposing NOx in the exhaust gas into nitrogen and water by ammonia generated from urea water.

酸化触媒３とディーゼルパティキュレートフィルタ４は、１つの筒状のケーシング２０内に収納され、車両のエンジンルーム内に配置されている。
また、選択還元型触媒１２は、車両のフロア下に配置された第１のケーシング２１及び第２のケーシング２２に分割して収納されている。第１のケーシング２１及び第２のケーシング２２は、軸方向両端部で夫々排気管２と接続し、その内径が排気管２の内径よりも大きい筒状に形成されている。第１のケーシング２１及び第２のケーシング２２は、車両を前後方向に延びる排気管２に直列に介装され、第１のケーシング２１の下流側に第２のケーシング２２が配置されている。第１のケーシング２１は、車両のフロア下を左右方向に延びるクロスメンバ２３の車両前方に位置し、第２のケーシング２２は、クロスメンバ２３の車両後方に位置し、第１のケーシング２１と第２のケーシング２２とがクロスメンバ２３の下部を前後に挟むように配置されている。 The oxidation catalyst 3 and the diesel particulate filter 4 are accommodated in one cylindrical casing 20 and are disposed in the engine room of the vehicle.
The selective catalytic reduction catalyst 12 is divided and stored in a first casing 21 and a second casing 22 that are arranged below the floor of the vehicle. The first casing 21 and the second casing 22 are respectively connected to the exhaust pipe 2 at both axial ends, and are formed in a cylindrical shape whose inner diameter is larger than the inner diameter of the exhaust pipe 2. The first casing 21 and the second casing 22 are interposed in series with the exhaust pipe 2 extending in the front-rear direction of the vehicle, and the second casing 22 is disposed on the downstream side of the first casing 21. The first casing 21 is located in front of the cross member 23 extending in the left-right direction below the floor of the vehicle, and the second casing 22 is located behind the cross member 23 in the vehicle. The two casings 22 are arranged so as to sandwich the lower part of the cross member 23 in the front-rear direction.

また、選択還元型触媒１２は、第１のケーシング２１内で上流側と下流側の２つに分割して配置されている。これにより、選択還元型触媒１２は、排気上流側より順番に第１のケーシング２１内に収納された第１の触媒担体３１及び第２の触媒担体３２と、第２のケーシング２２内に収納された第３の触媒担体３３とに分割されている。
更に、ディーゼルパティキュレートフィルタ２０の下流側には、ディーゼルパティキュレートフィルタ２０から排出された排気の温度を検出する第１の温度センサ３５が設けられている。 In addition, the selective catalytic reduction catalyst 12 is divided into two parts on the upstream side and the downstream side in the first casing 21. Thus, the selective catalytic reduction catalyst 12 is accommodated in the first casing 21 and the second catalyst carrier 32 accommodated in the first casing 21 and the second casing 22 in order from the exhaust upstream side. The third catalyst carrier 33 is divided.
Furthermore, a first temperature sensor 35 that detects the temperature of exhaust gas discharged from the diesel particulate filter 20 is provided on the downstream side of the diesel particulate filter 20.

また、第２のケーシング２２には、選択還元型触媒１２の温度を推定するための第２の温度センサ３６(温度検出手段)が設けられている。本実施形態では、第２の温度センサ３６は、第３の選択還元型触媒３３の下流側近傍に配置されている。
尿素水供給コントロールユニット４０（還元剤供給制御手段）は、入出力装置、記憶装置（ＲＯＭ、ＲＡＭ、不揮発性ＲＡＭ等）及び中央演算処理装置（ＣＰＵ）等を含んで構成され、エンジン回転速度、負荷、燃料噴射量等のエンジン１の運転情報をエンジンコントロールユニット４１より入力するとともに、第１の温度センサ３５及び第２の温度センサ３６から入力した排気温度を入力し、エンジン１の運転状態及び触媒温度に応じて尿素水インジェクタ１０を作動制御して、尿素水の噴射量を制御する。特に、第２の温度センサ３６から入力した排気温度に基づいて選択還元型触媒１２の触媒温度を推定し、当該触媒温度が活性状態となる所定温度（活性温度）未満では、尿素水の噴射を抑制する機能を有している。これにより、未活性状態の選択還元型触媒１２に対する無駄な尿素水の噴射を防止して、尿素水の使用量を抑制することが可能となる。 Further, the second casing 22 is provided with a second temperature sensor 36 (temperature detection means) for estimating the temperature of the selective catalytic reduction catalyst 12. In the present embodiment, the second temperature sensor 36 is disposed in the vicinity of the downstream side of the third selective reduction catalyst 33.
The urea water supply control unit 40 (reducing agent supply control means) includes an input / output device, a storage device (ROM, RAM, nonvolatile RAM, etc.), a central processing unit (CPU), etc. The operation information of the engine 1 such as the load and the fuel injection amount is inputted from the engine control unit 41, and the exhaust temperature inputted from the first temperature sensor 35 and the second temperature sensor 36 is inputted. The urea water injector 10 is operated and controlled in accordance with the catalyst temperature to control the urea water injection amount. In particular, the catalyst temperature of the selective catalytic reduction catalyst 12 is estimated based on the exhaust temperature input from the second temperature sensor 36, and if the catalyst temperature is lower than a predetermined temperature (active temperature) at which the catalyst is activated, urea water is injected. It has a function to suppress. As a result, it is possible to prevent useless injection of urea water with respect to the selective reduction catalyst 12 in the inactive state, thereby suppressing the amount of urea water used.

本実施形態では、選択還元型触媒１２として、触媒担体３１、３２、３３が３個直列に配置されており、第２の温度センサ３６を最下流側に位置する第３の触媒担体３３の下流に配置している。選択還元型触媒１２は、触媒自体が発熱するものではないので、上流側の第１の触媒担体３１及び第２の触媒担体３２よりも下流側の第３の触媒担体３３の方が低温となる。したがって、第３の触媒担体３３の下流側に配置した第２の温度センサ３６が検出した排気温度が選択還元型触媒の活性温度以上である場合には、第１の触媒担体３１及び第２の触媒担体３２のいずれも活性温度以上であることを正確に推定することができる。これにより、１つの温度センサ（第２の温度センサ３６）で、分割して配置された複数の触媒担体３１、３２、３３の全ての温度が活性状態であるか否かを判別することができ、温度センサの設置個数を低減して、部品点数及び部品コストを抑制することができる。   In the present embodiment, three catalyst carriers 31, 32, 33 are arranged in series as the selective catalytic reduction catalyst 12, and the second temperature sensor 36 is located downstream of the third catalyst carrier 33 located on the most downstream side. Is arranged. Since the selective catalytic reduction catalyst 12 does not generate heat, the upstream side first catalyst carrier 31 and the downstream side third catalyst carrier 33 are lower in temperature than the upstream side first catalyst carrier 31 and the second catalyst carrier 32. . Therefore, when the exhaust temperature detected by the second temperature sensor 36 disposed on the downstream side of the third catalyst carrier 33 is equal to or higher than the activation temperature of the selective catalytic reduction catalyst, the first catalyst carrier 31 and the second catalyst carrier 31 It can be accurately estimated that any of the catalyst supports 32 is at or above the activation temperature. Thereby, it is possible to determine whether or not all the temperatures of the plurality of catalyst carriers 31, 32, 33 arranged in a divided manner are in an active state by one temperature sensor (second temperature sensor 36). The number of temperature sensors can be reduced, and the number of parts and the part cost can be suppressed.

また、選択還元型触媒１２が３つの触媒担体３１、３２、３３に分割して配置されているので、車両の限られた搭載スペースで選択還元型触媒１２の容量を増加させることができる。更に、１つの触媒担体の大きさを抑えることができ、各触媒担体３１、３２、３３の製作が容易になる。また、選択還元型触媒１２が、第１のケーシング２１と第２のケーシング２２に分けられて収納されており、この第１のケーシング２１及び第２のケーシング２２の内径よりも、その間を接続する排気管２ａの内径が小さいので、第１のケーシング２１内を通過した排気が小径の排気管２ａで混合して第２のケーシング２２内に流入させることができる。これにより、第２のケーシング２２内の第３の触媒担体３３での浄化効率を向上させることができる。また、第１のケーシング２１と第２のケーシング２２とでクロスメンバ２３の下部を挟むように配置するので、車両の空いたスペースを最大限利用して選択還元型触媒１２の容量を増加させることができる。   Further, since the selective catalytic reduction catalyst 12 is divided into the three catalyst carriers 31, 32 and 33, the capacity of the selective catalytic reduction catalyst 12 can be increased in a limited mounting space of the vehicle. Furthermore, the size of one catalyst carrier can be suppressed, and the production of each catalyst carrier 31, 32, 33 is facilitated. In addition, the selective catalytic reduction catalyst 12 is divided and accommodated in a first casing 21 and a second casing 22, and the inner diameters of the first casing 21 and the second casing 22 are connected to each other. Since the inner diameter of the exhaust pipe 2 a is small, the exhaust gas that has passed through the first casing 21 can be mixed by the small diameter exhaust pipe 2 a and flow into the second casing 22. Thereby, the purification efficiency in the 3rd catalyst support | carrier 33 in the 2nd casing 22 can be improved. Further, since the first casing 21 and the second casing 22 are arranged so as to sandwich the lower part of the cross member 23, the capacity of the selective catalytic reduction catalyst 12 can be increased by making the most of the vacant space of the vehicle. Can do.

図２〜図４は、本願発明のその他の実施形態での第２の温度センサ３６の設置位置を示す選択還元型触媒１２、１３の構成図である。
図２に示すように、本願発明の第２の実施形態では、選択還元型触媒１２は、第１実施形態と同様に、第１のケーシング２１に第１の触媒担体３１と第２の触媒担体３２が収納され、第２のケーシング２２に第３の触媒担体３３が収納されている。第２の実施形態では、第２の温度センサ３６が、第１のケーシング２１と第２のケーシング２２の間の排気通路２aに設けられている。このように第２の温度センサ３６を排気通路２aに配置しても、第２の温度センサ３６が最下流の第３の触媒担体３３に近い位置に配置されれば、第２の温度センサ３６によって第３の触媒担体３３の温度を検出することができる。本実施形態でも、第２の温度センサ３６によって、最下流の第３の触媒担体３３の温度を検出することができ、全ての触媒担体３１、３２、３３の触媒温度が活性温度以上であるか否かを判定することができる。 FIGS. 2-4 is a block diagram of the selective reduction catalysts 12 and 13 which show the installation position of the 2nd temperature sensor 36 in other embodiment of this invention.
As shown in FIG. 2, in the second embodiment of the present invention, the selective catalytic reduction catalyst 12 has a first catalyst carrier 31 and a second catalyst carrier in a first casing 21 as in the first embodiment. 32 is accommodated, and a third catalyst carrier 33 is accommodated in the second casing 22. In the second embodiment, the second temperature sensor 36 is provided in the exhaust passage 2 a between the first casing 21 and the second casing 22. Thus, even if the second temperature sensor 36 is disposed in the exhaust passage 2a, the second temperature sensor 36 is provided if the second temperature sensor 36 is disposed at a position close to the third catalyst carrier 33 on the most downstream side. Thus, the temperature of the third catalyst carrier 33 can be detected. Also in this embodiment, it is possible to detect the temperature of the third downstream catalyst support 33 by the second temperature sensor 36, and whether the catalyst temperatures of all the catalyst supports 31, 32, 33 are equal to or higher than the activation temperature. It can be determined whether or not.

本願発明の第３の実施形態及び第４の実施形態の選択還元型触媒１３は、図３及び図４に示すように、第２のケーシング２２にも第１のケーシング２１と同様に、上流側と下流側に２つの選択還元型触媒（上流側：第３の触媒担体３３、下流側：第４の触媒担体３４）が直列に収納されている。
そして、第３の実施形態では、図３に示すように、第２の温度センサ３６が第３の触媒担体３３と第４の触媒担体３４との間に設けられている。また、第４の実施形態では、図４に示すように、第２の温度センサ３６が第４の触媒担体３３の下流側に配置している。このように、下流側の第２のケーシング２２に複数の触媒担体３３、３４が直列に配置されている場合には、このうち下流側に配置される第４の触媒担体３４の近傍に第２の温度センサ３６を配置して、第４の触媒担体３４の温度を検出可能にすれば、第２の温度センサ３６で全ての触媒担体（第１の触媒担体３１、第２の触媒担体３２、第３の触媒担体３３、第４の触媒担体３４）のいずれも活性温度以上であることを正確に推定することが可能となる。 As shown in FIGS. 3 and 4, the selective reduction catalyst 13 according to the third and fourth embodiments of the present invention has an upstream side in the second casing 22 as well as the first casing 21. Two selective reduction catalysts (upstream side: third catalyst carrier 33, downstream side: fourth catalyst carrier 34) are accommodated in series on the downstream side.
In the third embodiment, as shown in FIG. 3, the second temperature sensor 36 is provided between the third catalyst carrier 33 and the fourth catalyst carrier 34. In the fourth embodiment, as shown in FIG. 4, the second temperature sensor 36 is disposed on the downstream side of the fourth catalyst carrier 33. As described above, when the plurality of catalyst carriers 33 and 34 are arranged in series in the second casing 22 on the downstream side, the second catalyst carrier 34 is arranged in the vicinity of the fourth catalyst carrier 34 arranged on the downstream side. If the temperature sensor 36 is arranged so that the temperature of the fourth catalyst carrier 34 can be detected, all the catalyst carriers (the first catalyst carrier 31, the second catalyst carrier 32, It is possible to accurately estimate that both the third catalyst carrier 33 and the fourth catalyst carrier 34) are above the activation temperature.

本願発明は、上記実施形態に限定するものではない。例えば、ケーシングや触媒担体が上記実施形態よりも更に多く有する場合には、最下流の触媒担体の近傍に温度検出手段を設け、最下流の触媒担体の温度が検出できるように設置すればよい。
また、本願発明は、車両のエンジンの排気浄化システムとして選択還元型触媒を有するものに限らず、選択還元型触媒に代えてＮＯｘ吸蔵還元型触媒や酸化触媒などの排気浄化触媒を有するものにも適用できる。すなわち、当該排気浄化触媒が複数分割して直列に配置されているものに広く適用することができる。 The present invention is not limited to the above embodiment. For example, when there are more casings or catalyst carriers than in the above embodiment, a temperature detecting means may be provided in the vicinity of the most downstream catalyst carrier so that the temperature of the most downstream catalyst carrier can be detected.
The invention of the present application is not limited to a vehicle having an exhaust gas purification system such as a NOx occlusion reduction catalyst or an oxidation catalyst in place of the selective reduction catalyst. Applicable. That is, the present invention can be widely applied to a case where the exhaust purification catalyst is divided into a plurality of parts and arranged in series.

１ エンジン
２ 排気管（排気通路）
２ａ 排気管（排気通路）
１２ 選択還元型触媒（排気浄化触媒）
１０ 尿素水インジェクタ(還元剤供給手段)
２１ 第１のケーシング
２２ 第２のケーシング
３１ 第１の触媒担体
３２ 第２の触媒担体
３３ 第３の触媒担体
３４ 第４の触媒担体
３６ 第２の温度センサ（触媒温度検出手段）
４０ 尿素水供給コントロールユニット（還元剤供給制御手段） 1 Engine 2 Exhaust pipe (exhaust passage)
2a Exhaust pipe (exhaust passage)
12 Selective reduction catalyst (exhaust gas purification catalyst)
10 Urea water injector (reducing agent supply means)
21 1st casing 22 2nd casing 31 1st catalyst carrier 32 2nd catalyst carrier 33 3rd catalyst carrier 34 4th catalyst carrier 36 2nd temperature sensor (catalyst temperature detection means)
40 Urea water supply control unit (reducing agent supply control means)

Claims (5)

車両に搭載されたエンジンの排気通路に設けられ、当該排気通路内に還元剤を供給する還元剤供給手段と、
前記還元剤供給手段の下流側の前記排気通路に設けられ、前記排気通路内の排気に含まれる窒素酸化物を前記還元剤供給手段により供給された還元剤により還元浄化する排気浄化触媒と、
前記排気浄化触媒の触媒温度を検出する触媒温度検出手段と、
前記触媒温度検出手段により検出された前記触媒温度に基づいて前記還元剤供給手段の作動を制御する還元剤供給制御手段と、を備えた車両の排気浄化装置であって、
前記排気浄化触媒は、第１のケーシング内に排気流通方向に沿って直列に収納された第１の触媒担体及び第２の触媒担体と、前記第１のケーシングの下流側に離間して配置された第２のケーシング内に収納された第３の触媒担体を有し、
前記触媒温度検出手段は、前記第１のケーシングより下流に設置され、前記第３の触媒担体の温度を前記触媒温度として検出することを特徴とする車両の排気浄化装置。 A reducing agent supply means provided in an exhaust passage of an engine mounted on the vehicle, for supplying a reducing agent into the exhaust passage;
An exhaust purification catalyst that is provided in the exhaust passage on the downstream side of the reducing agent supply means and reduces and purifies nitrogen oxides contained in the exhaust gas in the exhaust passage by the reducing agent supplied by the reducing agent supply means;
Catalyst temperature detecting means for detecting a catalyst temperature of the exhaust purification catalyst;
An exhaust emission control device for a vehicle, comprising: a reducing agent supply control means for controlling the operation of the reducing agent supply means based on the catalyst temperature detected by the catalyst temperature detection means,
The exhaust purification catalyst is disposed in the first casing so as to be separated from the first catalyst carrier and the second catalyst carrier accommodated in series along the exhaust circulation direction, on the downstream side of the first casing. A third catalyst carrier housed in the second casing,
The exhaust gas purifying apparatus for a vehicle, wherein the catalyst temperature detecting means is installed downstream from the first casing and detects the temperature of the third catalyst carrier as the catalyst temperature. 前記触媒温度検出手段は、前記第３の触媒担体の下流側に配置され、前記第３の触媒担体を通過した排気の温度を前記触媒温度として検出することを特徴とする請求項１に記載の車両の排気浄化装置。   2. The catalyst temperature detection means is disposed downstream of the third catalyst carrier and detects the temperature of exhaust gas that has passed through the third catalyst carrier as the catalyst temperature. Vehicle exhaust purification system. 前記第２のケーシング内に、前記排気浄化触媒の一部を構成する第４の触媒担体が収納されて、前記第３の触媒担体の下流側に配置され、
前記触媒温度検出手段は、前記第４の触媒担体の下流側に配置され、前記第４の触媒担体を通過した排気の温度を前記触媒温度として検出することを特徴とする請求項１に記載の車両の排気浄化装置。 A fourth catalyst carrier that constitutes a part of the exhaust purification catalyst is accommodated in the second casing, and is disposed on the downstream side of the third catalyst carrier,
2. The catalyst temperature detection means is disposed downstream of the fourth catalyst carrier and detects the temperature of exhaust gas that has passed through the fourth catalyst carrier as the catalyst temperature. Vehicle exhaust purification system. 前記第１のケーシング及び前記第２のケーシングは、前記車両のフロア下を車両左右方向に延びるクロスメンバを、前後に挟んで配置されることを特徴とする請求項１から３のいずれか１項に記載の車両の排気浄化装置。   The first casing and the second casing are arranged with a cross member extending in the vehicle left-right direction below the floor of the vehicle sandwiched in the front-rear direction. An exhaust emission control device for a vehicle as described in 1. 前記第１のケーシングと前記第２のケーシングとの間の排気通路は、前記第１のケーシング及び前記第２のケーシングよりも流路断面積が小さく形成されていることを特徴とする請求項４に記載の車両の排気浄化装置。   5. The exhaust passage between the first casing and the second casing is formed to have a smaller flow path cross-sectional area than the first casing and the second casing. An exhaust emission control device for a vehicle as described in 1.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3073079A1 (en) 2015-03-27 2016-09-28 Kubota Corporation Engine exhaust aftertreatment device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04350319A (en) * 1991-05-27 1992-12-04 Suzuki Motor Corp Exhaust device for car
US20120060480A1 (en) * 2010-04-15 2012-03-15 Toyota Jidosha Kabushiki Kaisha Exhaust gas purifiying apparatus in internal combustion engine
JP2012097729A (en) * 2010-10-08 2012-05-24 Hino Motors Ltd Exhaust emission control device
JP2012117511A (en) * 2010-12-02 2012-06-21 Hyundai Motor Co Ltd Method for predicting amount of nitrogen oxide stored in nitrogen oxide reducing catalyst, and exhaust system using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04350319A (en) * 1991-05-27 1992-12-04 Suzuki Motor Corp Exhaust device for car
US20120060480A1 (en) * 2010-04-15 2012-03-15 Toyota Jidosha Kabushiki Kaisha Exhaust gas purifiying apparatus in internal combustion engine
JP2012097729A (en) * 2010-10-08 2012-05-24 Hino Motors Ltd Exhaust emission control device
JP2012117511A (en) * 2010-12-02 2012-06-21 Hyundai Motor Co Ltd Method for predicting amount of nitrogen oxide stored in nitrogen oxide reducing catalyst, and exhaust system using the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3073079A1 (en) 2015-03-27 2016-09-28 Kubota Corporation Engine exhaust aftertreatment device
US9863299B2 (en) 2015-03-27 2018-01-09 Kubota Corporation Engine exhaust treatment device

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