JP2008542606A - Device and method for exhaust gas regulation of internal combustion engines - Google Patents

Device and method for exhaust gas regulation of internal combustion engines Download PDF

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JP2008542606A
JP2008542606A JP2008513925A JP2008513925A JP2008542606A JP 2008542606 A JP2008542606 A JP 2008542606A JP 2008513925 A JP2008513925 A JP 2008513925A JP 2008513925 A JP2008513925 A JP 2008513925A JP 2008542606 A JP2008542606 A JP 2008542606A
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fuel
exhaust gas
reformer
reducing agent
catalyst
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ボルツェ マティアス
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Enerday GmbH
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
    • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
    • C01B3/38—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts
    • C01B3/386—Catalytic partial combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D43/00—Conjoint electrical control of two or more functions, e.g. ignition, fuel-air mixture, recirculation, supercharging or exhaust-gas treatment
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/02—Processes for making hydrogen or synthesis gas
    • C01B2203/025—Processes for making hydrogen or synthesis gas containing a partial oxidation step
    • C01B2203/0261—Processes for making hydrogen or synthesis gas containing a partial oxidation step containing a catalytic partial oxidation step [CPO]
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/16—Controlling the process
    • C01B2203/1685—Control based on demand of downstream process
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
    • C01B2203/16—Controlling the process
    • C01B2203/169—Controlling the feed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/30—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel reformer
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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
    • F01N2610/04—Adding substances to exhaust gases the substance being hydrogen
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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

Abstract

本発明は、ＮＯＸ触媒（１４）を備える排気系（１２）と、ＮＯＸ触媒（１４）の上流の排気系（１２）へ還元剤を供給するように設計された還元剤供給装置（１６）とを有する内燃機関（１０）の排ガス規制のためのデバイスに関する。本発明によると、還元剤供給装置（１６）は、機関（１０）によって排出されたガスと燃料とを反応させて、還元剤として作用する改質油にするように設計された改質装置（１８）を備える。
さらに、本発明は、排気系（１２）中に設けられたＮＯＸ触媒（１４）に還元剤が供給される内燃機関（１０）の排ガス規制のための方法に関する。同仕組みにおいて、改質装置（１８）により生成された改質油は還元剤として使用され、改質装置（１８）は、機関（１０）の排出ガスおよび燃料から改質油を生成する。The present invention, NO X catalyst (14) an exhaust system comprising a (12), NO X catalyst reducing agent supply device designed to supply the reducing agent upstream of the exhaust system (12) (14) (16 And a device for exhaust gas regulation of the internal combustion engine (10). According to the present invention, the reducing agent supply device (16) is a reforming device designed to react the gas discharged from the engine (10) with the fuel into a reformed oil that acts as a reducing agent ( 18).
Furthermore, the present invention relates to a method for the emission control of the exhaust system (12) an internal combustion engine the reducing agent is supplied to the NO X catalyst (14) provided in (10). In this structure, the reformed oil produced by the reformer (18) is used as a reducing agent, and the reformer (18) produces reformed oil from the exhaust gas and fuel of the engine (10).

Description

本発明は、ＮＯＸ触媒を備える排気系と、ＮＯＸ触媒の上流の排気系へ還元剤を供給するように設計された還元剤供給装置とを有する、内燃機関の排ガス規制のためのデバイスに関する。さらに、本発明は、排気系中に設けられたＮＯＸ触媒に還元剤が供給される、内燃機関の排ガス規制のための方法に関する。 The present invention includes an exhaust system comprising a NO X catalyst, and a reducing agent supply device designed to supply the reducing agent upstream of the exhaust system of the NO X catalyst, relates to a device for emission control of internal combustion engine . Furthermore, the present invention, the reducing agent is supplied to the NO X catalyst provided in the exhaust system, a method for the emission control of an internal combustion engine.

現代の自動車に関連する１つの問題は、特に高い燃焼室温度での機関中のガソリンまたはディーゼルの燃焼において物質化する窒素酸化物（ＮＯＸ）の排出である。ＮＯＸの排出を削減するため、触媒システムが、ＮＯＸを貯蔵し、それを安全な窒素へ還元することで知られている。包括的な特許文献１より、同目的のために、ＮＯＸ触媒の上流の排気系中へ、燃料の形態の還元剤を注入することが既に知られている。特許文献１より知られている純粋な燃料を注入する代わりに、還元剤として改質油を使用されることがある。どの種類の還元剤が選択されるかに関わらず、それは、排気システムの変動する背圧の抑制において、排気系中へ導入される必要がある。同目的のため、先行技術は、高性能ブロア、エアコンプレッサまたはインジェクタを使用するが、これらは全て、コストおよび頻繁な整備の厄介さを増加させる。
ＤＥ １０２ ３３ ６６ ５ Ａ１ One problem associated with modern automobile is an emission of nitrogen oxides to materialize (NO X), particularly at high gasoline or diesel combustion in the engine in the combustion chamber temperature. To reduce the emissions of NO X, the catalyst system, to store NO X, it is known to reduce it to a safe nitrogen. More comprehensive patent document 1, for the same purposes, into the upstream of the exhaust system of the NO X catalyst, to inject a reducing agent in the form of fuel are already known. Instead of injecting pure fuel known from Patent Document 1, reformed oil may be used as a reducing agent. Regardless of what type of reducing agent is selected, it needs to be introduced into the exhaust system in order to control the fluctuating back pressure of the exhaust system. For this purpose, the prior art uses high performance blowers, air compressors or injectors, all of which increase costs and the complexity of frequent maintenance.
DE 102 33 66 5 A1

本発明の目的は、排気システムの変動する背圧に対抗して排気系中に還元剤を導入するための、頻繁な整備を要する高コストな手段が、もはや不要とされるように、包括的なデバイスおよび方法を洗練することを含む。   It is an object of the present invention to provide a comprehensive, cost-effective means for introducing a reducing agent into the exhaust system against the fluctuating back pressure of the exhaust system so that frequent maintenance is no longer necessary. Refining various devices and methods.

同目的は、独立クレームの特徴により実現される。   This object is realized by the features of the independent claims.

本発明の有利な態様および他の実施形態が、従属クレームから読み取られる。   Advantageous aspects and other embodiments of the invention are read from the dependent claims.

本発明によるデバイスは、還元剤供給装置が、機関によって排出されたガスと燃料とを反応させて、還元剤として作用する改質油にするように設計された改質装置を備えるという点において、包括的な先行技術を洗練したものである。特に、ディーゼル機関に関しては、機関の排出ガスが、燃料に加え、改質油を生成するための原料であるかなりの量の酸素を含む。機関の下流で直ぐに同排出ガスを分岐させる場合、これは、対応する高圧レベルを有する。分岐された排出ガスのこの高圧レベルにより、本発明にしたがって、排気系中へ、ＮＯＸ触媒の上流に改質油を導入することが可能であり、したがって、改質油を導入するために必要とされる圧力を生成するために、先行技術において必要とされた、頻繁な整備を要する高コストな手段が不要となる。分岐された排出ガスおよび燃料は、改質装置中で混合され、改質装置の触媒へ供給される。その後の発熱部分酸化の形態の反応において、ある割合の水素および一酸化炭素の還元ガスを有する改質油ガスが生成される。これらのガスは、ＮＯＸ触媒中の亜酸化窒素を安全な窒素へ還元するのに適している。 The device according to the invention comprises that the reducing agent supply device comprises a reformer designed to react the gas discharged by the engine with the fuel into a reformed oil that acts as a reducing agent. It is a refinement of comprehensive prior art. In particular, for diesel engines, the engine exhaust contains a significant amount of oxygen that is a feedstock for producing reformate in addition to fuel. If the exhaust gas is diverted immediately downstream of the engine, this has a corresponding high pressure level. This high level of branched exhaust gas according to the present invention, into the exhaust system, it is possible to introduce the reformate upstream of the NO X catalyst, therefore, necessary to introduce the reformate In order to generate the required pressure, there is no need for expensive means of frequent maintenance required in the prior art. The branched exhaust gas and fuel are mixed in the reformer and supplied to the catalyst of the reformer. In the subsequent reaction in the form of exothermic partial oxidation, a reformed oil gas having a proportion of hydrogen and carbon monoxide reducing gas is produced. These gases are suitable for reducing the nitrous oxide in the NO X catalyst to safe nitrogen.

本発明によるデバイスに関して、改質装置へ供給される排出ガスが、機関の直ぐ下流に配設された排気系分岐を介して得られる場合、特に有利であると考えられる。機関の直ぐ下流では排出ガス圧は高く、したがって、排気系中の背圧に対抗して改質油を導入するのに非常に適している。   With regard to the device according to the invention, it is considered particularly advantageous if the exhaust gas supplied to the reformer is obtained via an exhaust system branch arranged immediately downstream of the engine. The exhaust gas pressure is high immediately downstream of the engine and is therefore very suitable for introducing reformate against the back pressure in the exhaust system.

本発明によるデバイスの好ましい他の実施形態により、改質装置へ供給される排出ガスは、排出ガス計量デバイスを備える排気系分岐を介して得られることが可能となる。同排出ガス計量デバイスにより、改質油を生成する各場合において改質装置へ供給されるのに必要な量の排出ガスを導入することが可能となる。排出ガス計量デバイスは、開ループ制御または閉ループ制御により作動する。   According to another preferred embodiment of the device according to the invention, the exhaust gas supplied to the reformer can be obtained via an exhaust system branch comprising an exhaust gas metering device. With this exhaust gas metering device, it is possible to introduce an amount of exhaust gas necessary to be supplied to the reformer in each case where reformed oil is produced. The exhaust gas metering device operates with open loop control or closed loop control.

上述の構成との組み合わせにおいて、排出ガス計量デバイスは、弁装置を備えてよい。同弁装置は、例えば排出ガスを戻すための弁と同様の絞り弁であってよい。   In combination with the above configuration, the exhaust gas metering device may comprise a valve device. The valve device may be a throttle valve similar to a valve for returning exhaust gas, for example.

それに加えて、またはその代替として、本発明によるデバイスにおいて、排出ガス計量デバイスが、ブロアへ供給される排出ガスが高圧レベルであるため、先行技術において必要とされたものに比べ、はるかに低力レベルに設計され得るブロアを備えることが、可能となり得る。   In addition or as an alternative, in the device according to the invention, the exhaust gas metering device is much less powerful than that required in the prior art because the exhaust gas supplied to the blower is at a high pressure level. It may be possible to have a blower that can be designed to a level.

本発明によるデバイスは、改質装置へ供給される排出ガスが、ＮＯＸ触媒の上流に配設された追加触媒の上流に配設される排気系分岐を介して得られるという点において、有利に洗練されることが可能である。同追加触媒は、例えば排ガス規制システムの主要触媒であってよく、排出ガスは、追加触媒の上流で得られ、排気系中のＮＯＸ触媒へ導入される。 The device according to the invention, exhaust gas supplied to the reformer, in that obtained via the exhaust system branch which is disposed upstream of the additional catalyst disposed upstream of the NO X catalyst, preferably It can be refined. The additional catalyst may be, for example, the main catalyst emission control system, the exhaust gas is obtained upstream of additional catalyst is introduced into the NO X catalyst in the exhaust system.

本発明によるデバイスの少なくともいくつかの態様において、デバイスが、燃料タンクから燃料をくみ上げるように設計された燃料ポンプを備えてもよい。詳細には、燃料ポンプは、各場合において改質油を生成するために必要とされる量において、燃料タンクから燃料をくみ上げるための燃料計量ポンプであってよい。また、同燃料ポンプは、開ループ制御または閉ループ制御を特徴としてよい。   In at least some aspects of the device according to the present invention, the device may comprise a fuel pump designed to pump fuel from the fuel tank. In particular, the fuel pump may be a fuel metering pump for pumping fuel from the fuel tank in the amount required to produce reformate in each case. The fuel pump may also feature open loop control or closed loop control.

本発明によるデバイスのさらに他の有利な実施形態により、燃料が、機関の燃料系統の燃料ラインから得られ、燃料が、燃料弁装置を介して改質装置へ供給されることが可能であり、当該燃料ラインは、詳細には、例えばコモン・レール帰路などの加圧燃料ラインであってよい。詳細には、燃料弁装置は、改質油を生成する各場合において必要とされる量の燃料を通過させる燃料絞り弁であってよい。また、同燃料弁装置は、開ループ制御または閉ループ制御を特徴としてよい。   According to yet another advantageous embodiment of the device according to the invention, fuel can be obtained from the fuel line of the engine fuel system, and the fuel can be supplied to the reformer via the fuel valve device, Specifically, the fuel line may be a pressurized fuel line, such as a common rail return path. Specifically, the fuel valve device may be a fuel throttle valve that passes the amount of fuel required in each case of producing reformed oil. The fuel valve device may be characterized by open loop control or closed loop control.

本発明による方法は、改質装置により生成される改質油が還元剤として使用され、改質装置は、機関の排出ガスおよび燃料から改質油を生成するという点において、先行技術を洗練したものである。この実現されたものは、本発明によるデバイスについて挙げられたものと同じ利点および特徴を有し、したがって、冗長な繰り返しを避けるために、本発明によるデバイスに関連する言及に対し参照がなされる。   The method according to the invention refines the prior art in that the reformate produced by the reformer is used as a reducing agent, and the reformer produces the reformate from the engine exhaust gas and fuel. Is. This realization has the same advantages and features as listed for the device according to the invention, so reference is made to the references relating to the device according to the invention in order to avoid redundant repetition.

同様のことが、本発明による方法の以下の好ましい態様にしたがって、ここにおいても当てはまり、本発明によるデバイスに関連する言及に対し参照がなされる。   The same applies here, in accordance with the following preferred embodiments of the method according to the invention, and reference is made to references relating to the device according to the invention.

本発明による方法の好ましい態様において、改質装置へ供給される排出ガスは、機関の直ぐ下流に配設された排気系分岐を介して得られることが可能である。   In a preferred embodiment of the method according to the invention, the exhaust gas supplied to the reformer can be obtained via an exhaust system branch arranged immediately downstream of the engine.

同様に、改質装置へ供給される排出ガスは、排出ガス計量デバイスを有する排気系分岐を介して得られることが、本発明による方法の利点であると考えられる。   Similarly, it is considered to be an advantage of the method according to the invention that the exhaust gas supplied to the reformer is obtained via an exhaust system branch having an exhaust gas metering device.

同仕組みにおいて、排出ガス計量デバイスは弁装置を備えることが、利点であると考えられる。   In this arrangement, it is considered advantageous to provide the exhaust gas metering device with a valve device.

それに加えて、またはその代替として、排出ガス計量デバイスはブロアを備えてもよい。   In addition or as an alternative, the exhaust gas metering device may comprise a blower.

本発明による方法のいくつかの態様においては、改質装置へ供給される排出ガスは、ＮＯＸ触媒の上流に配設された追加触媒への入口に配設される排気系分岐を介して得られてもよい。 In some embodiments of the method according to the present invention, exhaust gas supplied to the reformer via the exhaust system branch disposed at the inlet to add a catalyst disposed upstream of the NO X catalyst obtained May be.

本発明による方法においても、燃料タンクから燃料をくみ上げるように設計された燃料ポンプが含まれる態様が考えられる。   In the method according to the present invention, an aspect including a fuel pump designed to pump fuel from a fuel tank is conceivable.

この場合において、それに加えて、またはその代替として、燃料が、機関の燃料系統の燃料ラインから得られ、燃料が、燃料弁装置を介して改質装置へ供給されてもよい。   In this case, in addition or alternatively, fuel may be obtained from the fuel line of the engine's fuel system, and fuel may be supplied to the reformer via the fuel valve device.

本発明にしたがって実現されるものにおいて特に有利であることは、それが、改質装置の圧力が排出ガスの圧力レベルに今や常に適合されるため、排気システムの排気の背圧とは無関係であり、したがって機関の負荷とも無関係であることである。言い換えると、改質装置のシステムを介して、システムの圧力は、今や常に、実質的に一定であり、機関の負荷および排気の背圧とは無関係である。   It is particularly advantageous in what is realized according to the invention that it is independent of the exhaust system exhaust back pressure, since the reformer pressure is now always adapted to the exhaust gas pressure level. Therefore, it is independent of the engine load. In other words, through the reformer system, the system pressure is now always substantially constant and independent of engine load and exhaust back pressure.

以下、本発明の好ましい実施形態が、対応する図面を参照して、実施例により説明される。   Preferred embodiments of the invention will now be described by way of example with reference to the corresponding drawings.

同様の構成要素が、冗長な繰り返しを避けるために一度だけ説明される同様の参照番号によって、図中で同定される。   Similar components are identified in the figures by similar reference numbers that are described only once to avoid redundant repetition.

図１を参照すると、内燃機関１０が、ＮＯＸ触媒１４と、主要触媒である追加触媒２４とを備える排気系１２をどのように付与されるかが図示される。機関１０の直ぐ下流に配設されるのは、排気系分岐２０であり、排出ガス計量デバイス２２を介して改質装置１８を連結する。図１に示される実施形態において、排出ガス計量デバイス２２は、排出ガス絞り弁により形成される。燃料ポンプ２６が、燃料タンク２８から計量された燃料を改質装置１８に供給するために設けられる。排気系分岐２０、排出ガス計量デバイス２２、燃料ポンプ２６、および改質装置１８の全てが一体となって、還元剤供給装置を形成する。改質装置１８において、分岐された排出ガスおよび供給された燃料が混合され、改質装置１８の構成要素である改質油触媒（図示せず）へ供給される。その後の反応において、気体状態の改質油が、ある割合の水素および一酸化炭素の還元ガスを含んだ状態で生成される。このように生成された改質油が、ＮＯＸ触媒１４の上流の排気系１２中へ導入される。改質装置の圧力が、実際の排出ガス圧へ常に適合されるため、どのような特別な手段も、排気系１２中へ改質油を導入することにおける排気の背圧に打ち勝つのに必要とされない。次に、改質装置１８を介して、システムの圧力が、本発明にしたがって実現されるものにより、実質的に一定となり、機関負荷および排気の背圧とは無関係になる。絞り弁の形態の排出ガス計量デバイス２２と、燃料ポンプ２６とは共に、開ループ制御または閉ループ制御により作動することが可能である。同目的のため、改質装置１８の他の構成部材の開ループ制御または閉ループ制御を提供することもできる制御装置（図示せず）が、設けられてよい。 Referring to FIG. 1, it is illustrated how an internal combustion engine 10 is provided with an exhaust system 12 that includes a NO X catalyst 14 and an additional catalyst 24 that is a main catalyst. Disposed immediately downstream of the engine 10 is an exhaust system branch 20 that connects the reformer 18 via an exhaust gas metering device 22. In the embodiment shown in FIG. 1, the exhaust gas metering device 22 is formed by an exhaust gas throttle valve. A fuel pump 26 is provided to supply the metered fuel from the fuel tank 28 to the reformer 18. The exhaust system branch 20, the exhaust gas metering device 22, the fuel pump 26, and the reformer 18 are all integrated to form a reducing agent supply device. In the reformer 18, the branched exhaust gas and the supplied fuel are mixed and supplied to a reformed oil catalyst (not shown) that is a component of the reformer 18. In the subsequent reaction, a reformed oil in a gaseous state is produced in a state containing a certain proportion of hydrogen and carbon monoxide reducing gas. The thus generated reformate is introduced into the upstream of the exhaust system 12 of the NO X catalyst 14. Since the reformer pressure is always adapted to the actual exhaust gas pressure, any special measures are required to overcome the exhaust back pressure in introducing reformate into the exhaust system 12. Not. Next, via the reformer 18, the pressure in the system is substantially constant due to what is achieved in accordance with the present invention and is independent of engine load and exhaust back pressure. Both the exhaust gas metering device 22 in the form of a throttle valve and the fuel pump 26 can be operated by open loop control or closed loop control. For this purpose, a control device (not shown) may be provided that can also provide open loop control or closed loop control of other components of the reformer 18.

次に図２を参照すると、同様に本発明による方法を実施するのに適した、本発明によるデバイスの第２の実施形態の概略ブロック図が示される。図２に図示される実施形態は、排出ガス計量デバイス２２がブロアにより形成されるという点と、燃料ポンプの代わりに燃料弁装置３２が設けられるという点で、図１に図示される実施形態と異なる。排出ガス計量デバイス２２を形成するブロアは、排気系分岐２０が高い排出ガス圧下にあるため、比較的低出力ブロアであってよい。燃料弁装置３２は、機関１０の燃料系統の燃料ライン３０と改質装置１８との間に配設された燃料絞り弁により実現される。詳細には、機関１０の燃料系統の燃料ライン３０は、例えばコモン・レールの帰路などの燃料圧力ラインであってよい。この実現は、十分高い燃料圧力が任意の様式で得られるのであれば、個別の燃料ポンプは不要であるということが発見されたことに基づく。   Referring now to FIG. 2, there is shown a schematic block diagram of a second embodiment of a device according to the invention, which is also suitable for carrying out the method according to the invention. The embodiment illustrated in FIG. 2 differs from the embodiment illustrated in FIG. 1 in that the exhaust gas metering device 22 is formed by a blower and that a fuel valve device 32 is provided instead of the fuel pump. Different. The blower forming the exhaust gas metering device 22 may be a relatively low power blower because the exhaust system branch 20 is under high exhaust gas pressure. The fuel valve device 32 is realized by a fuel throttle valve disposed between the fuel line 30 of the fuel system of the engine 10 and the reformer 18. Specifically, the fuel line 30 of the fuel system of the engine 10 may be a fuel pressure line, such as a common rail return path. This realization is based on the discovery that a separate fuel pump is not required if a sufficiently high fuel pressure is obtained in any manner.

図２に図示される実施形態においても、制御装置（図示せず）が、図１に関する言及に関連して既に説明された対応する構成要素を作動させるために設けられてよい。したがって、排気の背圧および機関の負荷とは無関係に作動されることの利点は、図２に図示される実施形態へ同様に適用される。   Also in the embodiment illustrated in FIG. 2, a control device (not shown) may be provided for actuating the corresponding components already described in connection with reference to FIG. Thus, the benefits of being operated independently of exhaust back pressure and engine load apply equally to the embodiment illustrated in FIG.

排出ガス計量デバイスは、図２に図示された実施形態においても、弁装置により形成されてもよく、図１に図示される実施形態において、ブロアは、代替装置として使用されることが可能であるということが当然理解されよう。   The exhaust gas metering device may be formed by a valve device in the embodiment illustrated in FIG. 2, in which the blower can be used as an alternative device. Of course it will be understood.

上の説明中および図面中で開示され、特許請求の範囲で請求される本発明の特徴が、それら自体によりまたは任意の組み合わせにおいても本発明を実現するために必須であり得ることが理解されよう。   It will be understood that the features of the invention disclosed in the above description and in the drawings, and claimed in the claims may be essential for implementing the invention by itself or in any combination. .

本発明による方法を実施するのに適した、本発明によるデバイスの第１の実施形態を図示する概略ブロック図である。1 is a schematic block diagram illustrating a first embodiment of a device according to the invention suitable for carrying out the method according to the invention. 同様に本発明による方法を実施するのに適した、本発明によるデバイスの第２の実施形態を図示する概略ブロック図である。FIG. 3 is a schematic block diagram illustrating a second embodiment of a device according to the invention, which is also suitable for carrying out the method according to the invention.

符号の説明Explanation of symbols

１０‥機関、１２‥排気系、１４‥ＮＯＸ触媒、１６‥還元剤供給装置、１８‥改質装置、２０‥排気系分岐、２２‥排気ガス計量デバイス、２４‥追加触媒、２６‥燃料ポンプ、２８‥燃料タンク、３０‥燃料系統ライン、３２‥燃料弁装置 10 ‥ engine, 12 ‥ exhaust system, 14 ‥ NO X catalyst, 16 ‥ reducing agent supply device, 18 ‥ reformer, 20 ‥ exhaust system branch, 22 ‥ exhaust gas metering device, 24 ‥ additional catalyst, 26 ‥ fuel pump 28 ... Fuel tank, 30 ... Fuel system line, 32 ... Fuel valve device

Claims (16)

ＮＯＸ触媒（１４）を備える排気系（１２）と、前記ＮＯＸ触媒の上流の排気系（１２）へ還元剤を供給するように設計された還元剤供給装置（１６）とを有する内燃機関（１０）の排ガス規制のためのデバイスにおいて、前記還元剤供給装置（１６）は、前記機関（１０）によって排出されたガスと燃料とを反応させて、還元剤として作用する改質油にするように設計された改質装置（１８）を備えることを特徴とする、内燃機関（１０）の排ガス規制のためのデバイス。 An internal combustion engine having an exhaust system (12) having a NO X catalyst (14) and a reducing agent supply device (16) designed to supply a reducing agent to an exhaust system (12) upstream of the NO X catalyst In the device for exhaust gas regulation of (10), the reducing agent supply device (16) reacts the gas discharged by the engine (10) with fuel to form a reformed oil that acts as a reducing agent. Device for exhaust gas regulation of an internal combustion engine (10), characterized in that it comprises a reformer (18) designed in such a way. 前記改質装置（１８）へ供給される排出ガスは、前記機関（１０）の直ぐ下流に配設された排気系分岐（２０）を介して得られることを特徴とする、請求項１に記載のデバイス。   The exhaust gas supplied to the reformer (18) is obtained via an exhaust system branch (20) arranged immediately downstream of the engine (10). Devices. 前記改質装置（１８）へ供給される前記排出ガスは、排出ガス計量デバイス（２２）を備える排気系分岐（２０）を介して得られることを特徴とする、請求項１または２に記載のデバイス。   The exhaust gas supplied to the reformer (18) is obtained via an exhaust system branch (20) comprising an exhaust gas metering device (22). device. 前記排出ガス計量デバイス（２２）は、弁装置を備えることを特徴とする、請求項３に記載のデバイス。   Device according to claim 3, characterized in that the exhaust gas metering device (22) comprises a valve device. 前記排出ガス計量デバイス（２２）は、ブロアを備えることを特徴とする、請求項３または４に記載のデバイス。   Device according to claim 3 or 4, characterized in that the exhaust gas metering device (22) comprises a blower. 前記改質装置（１８）へ供給される前記排出ガスは、前記ＮＯＸ触媒（１４）の上流に配設された追加触媒（２４）の上流に配設される排気系分岐（２０）を介して得られることを特徴とする、前記請求項のいずれかに記載のデバイス。 Wherein the exhaust gas supplied to the reformer (18), through the exhaust system branch which is disposed upstream of the NO X catalyst (14) additional catalyst disposed upstream of (24) (20) The device according to claim 1, wherein the device is obtained. 燃料タンク（２８）から燃料をくみ上げるように設計された燃料ポンプ（２６）を備えることを特徴とする、前記請求項のいずれかに記載のデバイス。   A device according to any of the preceding claims, characterized in that it comprises a fuel pump (26) designed to pump fuel from a fuel tank (28). 前記燃料は、前記機関の燃料系統の燃料ラインから得られ、前記燃料は、燃料弁装置（３２）を介して前記改質装置（１８）へ供給されることを特徴とする、前記請求項のいずれかに記載のデバイス。   The fuel according to claim 1, wherein the fuel is obtained from a fuel line of a fuel system of the engine, and the fuel is supplied to the reformer (18) via a fuel valve device (32). A device according to any one. 前記排気系（１２）中に設けられたＮＯＸ触媒（１４）に還元剤が供給される内燃機関（１０）の排ガス規制のための方法において、還元剤として改質装置（１８）により生成される改質油が使用され、前記改質装置（１８）は、前記機関（１０）の排出ガスおよび燃料から改質油を生成することを特徴とする、内燃機関（１０）の排ガス規制のための方法。 A method for emission control of the exhaust system (12) an internal combustion engine the reducing agent is supplied to the NO X catalyst (14) provided in (10) is generated by the reformer (18) as a reducing agent For reforming the exhaust gas of the internal combustion engine (10), the reformer (18) generates the reformed oil from the exhaust gas and fuel of the engine (10). the method of. 前記改質装置（１８）へ供給される排出ガスは、前記機関（１０）の直ぐ下流に配設された排気系分岐（２０）を介して得られることを特徴とする、請求項９に記載の方法。   The exhaust gas supplied to the reformer (18) is obtained via an exhaust system branch (20) arranged immediately downstream of the engine (10). the method of. 前記改質装置（１８）へ供給される前記排出ガスは、排出ガス計量デバイス（２２）を備える排気系分岐（２０）を介して得られることを特徴とする、請求項９または１０に記載の方法。   11. The exhaust gas supplied to the reformer (18) is obtained via an exhaust system branch (20) comprising an exhaust gas metering device (22). Method. 前記排出ガス計量デバイス（２２）は、弁装置を備えることを特徴とする、請求項１１に記載の方法。   12. Method according to claim 11, characterized in that the exhaust gas metering device (22) comprises a valve device. 前記排出ガス計量デバイス（２２）は、ブロアを備えることを特徴とする、請求項１１または１２に記載の方法。   13. A method according to claim 11 or 12, characterized in that the exhaust gas metering device (22) comprises a blower. 前記改質装置（１８）へ供給される前記排出ガスは、前記ＮＯＸ触媒（１４）の上流に配設された追加触媒（２４）の上流に配設される排気系分岐（２０）を介して得られることを特徴とする、請求項９から１３のいずれかに記載の方法。 Wherein the exhaust gas supplied to the reformer (18), through the exhaust system branch which is disposed upstream of the NO X catalyst (14) additional catalyst disposed upstream of (24) (20) The method according to claim 9, wherein the method is obtained as follows. 前記改質装置（１８）へ供給される前記燃料は、燃料ポンプ（２６）により供給されることを特徴とする、請求項９から１４のいずれかに記載の方法。   15. A method according to any of claims 9 to 14, characterized in that the fuel supplied to the reformer (18) is supplied by a fuel pump (26). 前記燃料は、前記機関の燃料系統の燃料ラインから得られ、前記燃料は、燃料弁装置（３２）を介して前記改質装置（１８）へ供給されることを特徴とする、請求項９から１５のいずれかに記載の方法。   The fuel is obtained from a fuel line of a fuel system of the engine, and the fuel is supplied to the reformer (18) via a fuel valve device (32). 15. The method according to any one of 15.
JP2008513925A 2005-06-02 2006-06-01 Device and method for exhaust gas regulation of internal combustion engines Withdrawn JP2008542606A (en)

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PCT/DE2006/000957 WO2006128449A1 (en) 2005-06-02 2006-06-01 Device and method for purification of exhaust gases from an internal combustion engine

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KR100923521B1 (en) 2009-10-27
DE102005025455B4 (en) 2009-03-19
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KR20080015019A (en) 2008-02-15
EP1888889A1 (en) 2008-02-20
DE102005025455A1 (en) 2006-12-07
CA2611027A1 (en) 2006-12-07
WO2006128449A1 (en) 2006-12-07
AU2006254533A1 (en) 2006-12-07
US20090044519A1 (en) 2009-02-19
AU2006254533A8 (en) 2008-02-21
DE102005063323A1 (en) 2006-12-07

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