CN1676892A - 发动机废气净化设备 - Google Patents

发动机废气净化设备 Download PDF

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CN1676892A
CN1676892A CNA2005100562122A CN200510056212A CN1676892A CN 1676892 A CN1676892 A CN 1676892A CN A2005100562122 A CNA2005100562122 A CN A2005100562122A CN 200510056212 A CN200510056212 A CN 200510056212A CN 1676892 A CN1676892 A CN 1676892A
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sulphur
catalytic converter
combustible component
control unit
temperature
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村田峰啓
筒井泰弘
近藤畅宏
高桥嘉则
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MITSUBISHI FOSON COACH (PASSENGER) CO Ltd
Mitsubishi Fuso Truck and Bus Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—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
    • F01N9/00—Electrical control of exhaust gas treating 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
    • 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
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
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    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
    • F02D41/025—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by changing the composition of the exhaust gas, e.g. for exothermic reaction on 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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
    • F02D41/028—Desulfurisation of NOx traps or adsorbent
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    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/04—Sulfur or sulfur 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—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
    • F01N3/0814—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
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • 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
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    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

一种根据本发明的发动机废气净化设备包括设置在发动机(20)的排气管(40)中的吸收NOx的催化转化器(42)；将还原剂成分提供到排气管(40)中的废气轻油添加喷射器(41)；控制单元(100)，该控制单元在每个预定时间周期内执行控制空气－燃料比升高的富可燃成分强化操作，该操作将HC成分添加到吸收NOx的催化转化器(42)中，并加热到硫净化温度或更高温度，以便清除吸收NOx的催化转化器(42)中所吸收的含硫成分；以及催化剂温度测量传感器(101)，该传感器用于测量吸收NOx的催化转化器(42)的温度，其中，控制单元(100)基于硫净化温度相对于催化剂温度测量传感器(101)所测得温度的偏差来控制富可燃成分强化操作的操作循环。

Description

发动机废气净化设备
技术领域
本发明涉及一种发动机废气净化设备，该设备具有废气排放净化功能，能够净化包含在内燃机废气排放中的有害成分，本发明尤其涉及硫净化驱动时的催化剂温升控制。
背景技术
传统上，已知一种废气净化设备，该废气净化设备在发动机排气管中设置有吸收NOx的催化转化器。对于使用这样一种NOx催化剂的废气净化设备，为了排放并还原所吸收的NOx，需要周期性地(例如，一分钟一次)执行富可燃成分强化操作，该操作通过在NOx还原催化转化器的废气排放上游侧处提供诸如轻油的还原剂，使提供给催化转化器的气体中的空气-燃料比(以下称为“接触催化剂之前的λ”)降低到1或者更低。具体而言，通过控制发动机进气***，进行后喷射等等以及通过把燃料喷射到催化转化器上游侧的排气管中来降低λ，从而实现富可燃成分强化操作。
此外，已知一种在执行富可燃成分强化的情况下根据催化剂温度改变贫燃烧度和富燃烧度的技术(例如，日本专利特开平11-270382)。
另一方面，根据吸收NOx的催化剂，燃料中的含硫成分产生了含硫的有害物。为了除硫，必须周期性地执行(例如，每5,000km移距进行一次)大约一分钟的排放硫净化驱动，以便清除含硫成分。对于硫净化驱动，需要例如600℃或更高的催化剂温度(硫净化温度)。因此，已知一种技术，通过把轻油添加到排气管中，进行后喷射等方法来供应HC，从而提高吸收NOx的催化剂温度(例如，参见日本专利特开平11-270382)。
根据上述发动机废气净化设备，出现了以下问题。图6所示的曲线H1至H4表示废气净化设备中的执行富可燃成分强化操作的富可燃成分强化操作信号的定时，执行硫净化驱动的硫净化信号的定时，供应到废气管道中的CO、HC供应量，以及催化剂温度(催化转化器出口的气体温度)随着时间推移而发生的变化。
由曲线H1和H2可见，由于富可燃成分强化控制和硫净化控制是独立执行的，因而可以同时执行富可燃成分强化操作和硫净化驱动。由于富可燃成分强化操作和硫净化驱动都是通过添加废气轻油或者进行后喷射来提供HC而实现的，因而向催化剂供应HC的操作可能过度依赖于定时脉冲，从而可能导致催化剂的过度温升。
因此，尽管能想到通过在硫净化驱动的同时减少CO、HC供应量而防止HC供应过量的预防措施，相反的是，问题在于达到硫净化温度的时间被拖延或者根本无法达到硫净化温度。
发明内容
所以，本发明的一个目的是提供一种发动机废气净化设备，该设备能够有效地执行富可燃成分强化控制和硫净化驱动，并防止由富可燃成分强化操作引起的催化剂过度温升。
本发明提供一种发动机废气净化设备，该设备包括：催化转化器，该催化转化器设置在发动机的排气管中，吸收流入排气管中的废气中的NOx并在废气中的空气-燃料比变高时还原NOx；还原剂供应单元，该还原剂供应单元将包括HC在内的还原剂成分供应到排气管中；富可燃成分强化控制单元，该控制单元执行富可燃成分强化操作，通过在每个预定时间周期内操作还原剂供应单元来控制空气-燃料比暂时变高；硫净化控制单元，该硫净化控制单元判断是否需要进行硫净化驱动，该硫净化驱动将HC成分添加到催化转化器中，并通过加热到预定温度或更高温度来清除催化转化器中所吸收的含硫成分；以及测量催化转化器的温度的催化剂温度测量传感器，其中，在硫净化控制单元判断需要进行硫净化的情况下，富可燃成分强化控制单元基于预定温度相对于催化剂温度测量传感器所测得温度的偏差来控制富可燃成分强化操作的操作循环。
本发明还提供一种发动机废气净化设备，其包括：设置在发动机的排气管中的催化转化器，该催化转化器用于吸收流入排气管中的废气中的NOx并在废气中的空气-燃料比变高时还原NOx；还原剂供应单元，该还原剂供应单元将包括HC在内的还原剂成分供应到排气管中；富可燃成分强化控制单元，该控制单元执行富可燃成分强化操作，通过在每个预定时间周期内操作还原剂供应单元而控制空气-燃料比暂时变高；硫净化控制单元，该硫净化控制单元判断是否需要进行硫净化驱动，该硫净化驱动将HC成分添加到催化转化器中，并通过加热到预定温度或更高温度来清除催化转化器中所吸收的含硫成分；以及测量催化转化器的温度的催化剂温度测量传感器，其中，在硫净化控制单元判断需要进行硫净化的情况下，富可燃成分强化控制单元基于预定温度相对于催化剂温度测量传感器所测得温度的偏差来控制富可燃成分强化操作的操作周期。
根据本发明，能够有效地执行富可燃成分控制和硫净化驱动，并防止由富可燃成分强化操作引起的催化剂过度温升。
本发明的其它优点将在以下的说明中阐述，其中一部分优点可以从说明书中明显地看出来，或者可以通过实践本发明而获知。借助于下文所特别指出的手段和装置可以认识到并获得本发明的优点。
附图说明
结合于说明书中并构成说明书一部分的附图描述了本发明的实施例，并与上面给出的一般性叙述以及下面对于实施例的详述一起用于阐明本发明的原理。
图1是表示根据本发明实施例的发动机废气净化设备的结构的简图；
图2是表示每单位时间的CO、HC供应量与催化剂温度之间的关系的曲线图；
图3是表示富可燃成分强化循环(Rich spike cycle)及富可燃成分强化周期(Rich spike period)与每单位时间的CO、HC供应量之间的关系的曲线图；
图4是示意性曲线图，表示发动机废气净化设备中的富可燃成分强化信号(Rich spike signal)定时、执行硫净化驱动的硫净化信号定时、供应到废气管道中的CO，HC供应量、以及催化剂温度(催化转化器出口的气体温度)随着时间推移而发生的变化；
图5是示意性曲线图，表示发动机废气净化设备中的富可燃成分强化信号定时、执行硫净化驱动的硫净化信号定时、供应到废气管道中的CO、HC供应量、以及催化剂温度(催化转化器出口的气体温度)随着时间推移而发生的变化；而
图6是示意性曲线图，表示现有的废气净化设备中的富可燃成分强化信号定时、执行硫净化驱动的硫净化信号定时，供应到废气管道中的CO、HC供应量、以及催化剂温度(催化转化器出口的气体温度)随着时间推移而发生的变化。
具体实施方式
图1是表示根据本发明的一个实施例的发动机废气净化设备10的结构的简图；
发动机***10包括柴油机20。柴油机20在其进气口一侧连接到进气管30而在其排气口一侧连接到排气管40。此外，柴油机20的排气口一侧与进气管30通过EGR管道50连接起来，该EGR管道50使废气(EGR气体)循环到进气管30中。图3中的附图标记60表示增压器而附图标号100表示控制单元。
按照从进气口一侧开始的顺序，进气管30设置有气流传感器30，增压器60的压缩机61，中间冷却器32，进气节流阀33，以及对应于EGR管道50的连接部分34。
按照从柴油机20侧开始的顺序，排气管40设置有增压器60的涡轮机62；废气轻油添加喷射器41，该喷射器41将轻油供应给排气管40；以及吸收NOx的催化转化器42。所述催化转化器42吸收流入排气管40中的废气内的NOx并在废气含量增大时还原所吸收的NOx。
按照从排气管40侧开始的顺序，EGR管道50设置有冷却废气的EGR冷却器51，以及调节废气流量的EGR阀52。
控制单元100连接到催化剂温度测量传感器101的输出端，该传感器101设置于排气管40的吸收NOx的催化转化器42的出口侧，以便始终反馈吸收NOx的催化转化器42的催化剂温度。
根据如上配置的发动机***10，通过以下操作执行硫净化驱动。即，在普通的发动机驱动过程中，通过控制发动机的燃烧并把包括HC在内的轻油从废气轻油添加喷射器41添加到排气管40中去，以预定时间间隔来实现富可燃成分强化操作。这时，如果存在硫净化驱动指令，那么就通过把HC从废气轻油添加喷射器41供应到排气管40中去而提高了吸收NOx的催化转化器41的温度。此时，在催化剂温度未达到硫净化温度T的情况下，控制富可燃成分强化操作以提高升温速度，也即，缩短富可燃成分强化操作的周期(图4中的M)。
在催化剂温度达到硫净化温度T的情况下，富可燃成分强化操作的时间间隔返回到原始时间间隔。因此，催化剂温度在硫净化驱动温度T附近波动而不会过度上升。在催化剂温度高于硫净化驱动温度T的情况下，可以控制富可燃成分强化循环，使其变长。在完成硫净化驱动并返回初始发动机驱动状态时，富可燃成分强化操作返回到初始循环。
如上所述，根据本实施例的发动机***10，当启动硫净化驱动时，随着催化剂温度相对于硫净化温度T的偏差增大，通过缩短富可燃成分强化循环来控制催化剂温度，以便使催化剂温度在短时间内达到硫净化温度T。如图2和3所示，这表示可以通过缩短富可燃成分强化循环而相应地增大催化剂温度的升温量，从而增大每单位时间的CO、HC供应量。因此，执行富可燃成分强化时，能通过硫净化驱动均匀地消除吸收NOx的催化转化器42所吸收的含硫成分，并防止过度升温。
图5所示的曲线L1至L4表示在根据发动机***10的一个修改实施例的发动机废气净化设备中执行富可燃成分强化操作的富可燃成分强化信号定时、执行硫净化驱动的硫净化信号定时、供应到废气管的CO、HC供应量以及催化剂温度(催化转化器出口的气体温度)随着时间推移而发生的变化。
尽管可在如上所述的实施例中调整富可燃成分强化操作的循环，本实施例中也可以调整富可燃成分强化周期(每一次执行富可燃成分强化所需的时间)。即，在普通的发动机驱动过程中，以预定时间间隔执行富可燃成分强化操作一个特定的周期。这时，当存在硫净化驱动指令时，吸收NOx的催化转化器42的温度就通过把HC供应到排气管40中而提高。此时，在催化剂温度未达到硫净化温度T的情况下，控制富可燃成分强化操作以便提高升温速度，即，延长富可燃成分强化操作的周期(图5所示的N)。
当催化剂温度达到硫净化温度T时，富可燃成分强化周期返回到初始长度。因此，催化剂温度在硫净化温度T附近波动而不会过度升温。在催化剂温度高于硫净化温度T时，可以控制富可燃成分强化周期，使其变短。当完成硫净化驱动时，富可燃成分强化周期返回到普通长度。在本修改实施例中，也能获得如上所述的与控制富可燃成分强化循环相同的效果。
本发明不局限于上述实施例。例如，尽管在上述实施例中要么控制富可燃成分强化循环要么控制富可燃成分强化周期，但也可以同时控制它们。当然，在不背离本发明主旨范围的前提下可以进行各种各样的修改。
对于本领域的熟练技术人员而言，很容易发现其它优点并进行其它修改。因此，本发明的内容有更宽泛的范围，而不局限于本文所描绘和叙述的具体细节以及代表性实施例。所以，在不背离权利要求书及其等效技术方案所确定的基本发明理念的精神或范围的前提下可以进行各种各样的修改。

Claims (4)

1.一种发动机废气净化设备，其特征在于，包括：
催化转化器(42)，该催化转化器设置在发动机(20)的排气管(40)内，吸收流入排气管(40)中的废气内的NOx并在废气的空气-燃料比变得较高时还原NOx；
还原剂供应单元(41)，该还原剂供应单元将包括HC在内的还原剂成分供应到排气管(40)中；
富可燃成分强化控制单元(100)，该控制单元执行富可燃成分强化操作，该富可燃成分强化操作通过在每个预定时间周期内操作还原剂供应单元(41)而控制空气-燃料比暂时变高；
硫净化控制单元(100)，该硫净化控制单元判断是否需要进行硫净化驱动，该硫净化驱动将HC成分添加到催化转化器(42)中，并通过加热到预定或更高温度来清除催化转化器(42)中所吸收的含硫成分；以及
测量催化转化器(42)的温度的催化剂温度测量传感器(101)，
其中，在硫净化控制单元(100)判断需要进行硫净化的情况下，富可燃成分强化控制单元(100)基于预定温度相对于催化剂温度测量传感器(101)所测得温度的偏差来控制富可燃成分强化操作的操作循环。
2.根据权利要求1所述的发动机废气净化设备，其特征在于，所述偏差增大时所述循环被缩短。
3.一种发动机废气净化设备，其特征在于，包括：
催化转化器(42)，该催化转化器设置在发动机(20)的排气管(40)内，吸收流入排气管(40)中的废气内的NOx并在废气的空气-燃料比变得较高时还原NOx；
还原剂供应单元(41)，该还原剂供应单元将包括HC在内的还原剂成分供应到排气管中；
执行富可燃成分强化操作的富可燃成分强化控制单元(100)，该富可燃成分强化操作通过在每个预定时间周期(41)内操作所述还原剂供应单元(41)而控制空气-燃料比暂时变高；
硫净化控制单元(100)，该硫净化控制单元判断是否需要进行硫净化驱动，该硫净化驱动将HC成分添加到催化转化器(42)中，并通过加热到预定温度或更高温度来清除催化转化器(42)中所吸收的含硫成分；以及
测量催化转化器(42)的温度的催化剂温度测量传感器(101)，
其中，在硫净化控制单元(100)判断需要进行硫净化的情况下，富可燃成分强化控制单元(100)基于预定温度相对于催化剂温度测量传感器(101)所测得温度的偏差来控制富可燃成分强化操作的操作周期。
4.根据权利要求3所述的发动机废气净化设备，其特征在于，在所述偏差增大时所述周期被延长。
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