CN102844532A - 废气净化装置 - Google Patents

废气净化装置 Download PDF

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CN102844532A
CN102844532A CN2011800187169A CN201180018716A CN102844532A CN 102844532 A CN102844532 A CN 102844532A CN 2011800187169 A CN2011800187169 A CN 2011800187169A CN 201180018716 A CN201180018716 A CN 201180018716A CN 102844532 A CN102844532 A CN 102844532A
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exhaust
catalyzer
combustion engine
temperature
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CN102844532B (zh
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长冈大治
中田辉男
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Isuzu Motors Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/021Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024Introducing 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
    • F02D41/025Introducing 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
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    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9459Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • B01D53/9477Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
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    • F01N11/005Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus the temperature or pressure being estimated, e.g. by means of a theoretical model
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    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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    • F01N3/0828Exhaust 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
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    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust 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
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    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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    • F01N3/18Exhaust 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
    • F01N3/20Exhaust 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
    • F01N3/2066Selective catalytic reduction [SCR]
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    • F02D41/1444Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
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Abstract

一种废气净化装置,通过简单的构成,改善排气后处理装置的低温特性,并且提高NOx的还原净化率,有效降低白烟的产生。具备:设置在内燃机(10)的排气通路(11)上的排气后处理装置(30);排气管内喷射阀(22);第一催化剂(35);将从排气管内喷射阀(22)喷射的燃料热解的第二催化剂(36);推测排气温度的排气温度推测部(41);控制内燃机(10)的燃料喷射的发动机喷射控制部(42);以及控制排气后处理装置(30)的再生的再生控制部(43、44);发动机喷射控制部(42)在再生控制部(43、44)的再生时,在排气温度推测部(41)的输出值为阈值以下的情况下,以包括向第一催化剂(35)供给燃料的后喷射在内的多级喷射来控制内燃机的燃料喷射。

Description

废气净化装置
技术领域
本发明涉及一种废气净化装置,其具有设置在内燃机的排气通路上的排气后处理装置和排气后处理装置上游侧的排气管内喷射阀。
背景技术
作为柴油机(内燃机)的排气后处理装置,使用有捕集废气中的粒状物(PM)的DPF(柴油颗粒过滤器)、还原净化NOx的LNT(LNT吸藏还原型催化剂)。此外,作为该DPF、LNT的强制再生,已知向排气管内直接喷射燃料的排气管内喷射。排气管内喷射与后喷射相比没有燃料导致的油稀释,此外,在排气后处理装置的强制再生时能够并用EGR,因此具有防止NOx恶化等优点。
在该排气管内喷射中,所喷射的燃料在废气中被热解(气化)的同时到达下游侧的DPF、LNT,通过HC、CO的燃烧来使催化剂升温、或作为NOx还原剂起作用。所喷射的燃料向HC、CO的热解开始的温度为200~250℃以上,因此为了防止燃料向排气管的附着等,优选在废气温度为200~250℃以上时进行排气管内喷射。因此,在怠速等以200℃以下的废气温度进行排气管内喷射的情况下,为了使废气升温而需要并用多级喷射。
例如,专利文献1公开了一种废气净化装置,在内燃机的排气通路上设置NOx吸蔵还原型的催化剂,在NOx还原控制时能够并用排气管内喷射和多级喷射。
现有技术文献
专利文献
专利文献1:日本特开2007-170218号公报
发明内容
发明要解决的课题
然而,为了废气的升温而进行的多级喷射为,喷射图形与通常喷射相比被大幅度地延迟,而燃烧集中在膨胀冲程。因此,在加速时空燃比λ降低而缸内压力也降低,因此有时燃烧变得不稳定并导致加速不良等引起的驾驶性能的恶化。
此外,当要在怠速以外的运转条件下中止多级喷射而进行通常喷射时,在低负载区域中废气温度降低。当在这种状态下进行排气管内喷射时,所喷射的燃料(轻油)不被热解而附着在排气管内。因此,该附着的燃料有可能在废气温度上升时挥发而产生白烟。
此外,在废气温度较低的低废气温度气氛中,向排气管内喷射的燃料(轻油)在不进行分解的状态下到达下游侧的催化剂,因此催化剂前面有可能产生由燃料导致的过滤器堵塞。此外,在LNT的强制再生(燃料过量供给)时,由于NOx的还原效率降低,有时HC减退会恶化。
本发明是鉴于这种课题而进行的,其目的在于提供一种废气净化装置,通过简单的构成,能够改善排气后处理装置的低温特性,并且能够提高NOx还原净化率,有效地降低白烟的产生。
用于解决课题的手段
为了实现上述目的,本发明的废气净化装置的特征在于,具备:排气后处理装置,设置在内燃机的排气通路上;排气通路燃料喷射单元,设置在上述排气后处理装置上游侧的上述排气通路上;第一催化剂,设置在上述排气通路燃料喷射单元上游侧的上述排气通路上;第二催化剂,设置在上述排气通路燃料喷射单元和上述排气后处理装置之间的上述排气通路上,将从上述排气通路燃料喷射单元喷射的燃料进行热解;排气温度推测单元,检测或推测上述内燃机的排气温度并输出;内燃机喷射控制单元,控制上述内燃机的燃料喷射;以及再生控制单元,对从上述排气通路燃料喷射单元喷射燃料而进行的上述排气后处理装置的再生进行控制;上述内燃机喷射控制单元在上述再生控制单元的再生控制时,在上述排气温度推测单元的输出值为阈值以下的情况下,为了使上述第二催化剂的催化剂温度升温到阈值以上,而以包括向上述第一催化剂供给燃料的后喷射在内的多级喷射来控制上述内燃机的燃料喷射。
此外,也可以为,进一步具备:设置在上述第二催化剂上游部的电加热器;以及控制上述电加热器的工作的电加热器控制部;上述电加热器控制部在上述再生控制单元的再生控制时,在上述排气温度推测单元的输出值为阈值以下的情况下,使上述电加热器工作。
此外,也可以为,上述第一催化剂以及上述第二催化剂具有金属制的载体,并且与上述排气通路一体形成。
此外,也可以为,上述排气后处理装置具备DPF以及LNT吸藏还原型催化剂。
此外,也可以为,上述排气后处理装置具备DPF以及SCR选择还原型催化剂。
发明效果
根据本发明的废气净化装置,通过简单的构成,能够改善排气后处理装置的低温特性,并且能够提高NOx还原净化率,有效地降低白烟的产生。
附图说明
图1是本发明一个实施方式的废气净化装置的示意图。
图2是表示本发明一个实施方式的废气净化装置的控制ECU的框图。
图3是表示本发明一个实施方式的废气净化装置的PM强制再生控制的流程图。
图4是表示本发明一个实施方式的废气净化装置的LNT强制再生控制的流程图。
图5是表示其它实施方式的废气净化装置的构成的示意图。
图6是表示其它实施方式的排气后处理装置的构成的示意图。
具体实施方式
以下,根据附图对本发明的一个实施方式进行说明。
图1~4是对本发明一个实施方式的废气净化装置1进行说明的图。对相同的部件赋予相同的符号,它们的名称及功能也相同。因此,不对它们重复进行详细说明。
如图1所示,在柴油机(内燃机)10上设置有进气歧管10b和排气歧管10a。此外,在该进气歧管10b上连接有通过柴油机10内的进气阀(未图示)的开阀来导入新气(吸入空气)的进气通路14,在排气歧管10a上连接有通过排气阀(未图示)的开阀来排出废气的排气通路11。
在进气通路14的上游侧安装有进气节气门18、中冷器17、增压器12以及空气质量流量传感器16,并且在进气通路14的前端设置有空气滤清器15。此外,进气歧管10b和排气歧管10a通过EGR通路19连通,在该EGR通路19上设置有EGR冷却器20和EGR阀21。
在排气通路11的下游侧设置有详细情况将后述的排气后处理装置30,在其上游侧设置有氧化催化剂(第一催化剂)35。此外,在氧化催化剂35下游侧的排气通路11上,设置有使作为燃料的轻油热解(气化)的轻油分解催化剂(第二催化剂)36。
在氧化催化剂35和轻油分解催化剂36之间,设置有向排气管内喷射燃料的排气管内喷射阀(排气通路燃料喷射单元)22。此外,在氧化催化剂35上游侧的排气通路11上,设置有对从柴油机10排出的废气温度进行检测的排气温度传感器24。
排气后处理装置30构成为,从上游侧起依次具备LNT(LNT吸藏还原型催化剂)31和DPF32。
LNT31为公知的构造,在蜂窝构造的催化剂载体上载持NOx吸蔵材料等而构成。该LNT31在稀混合气氛的通常运转时吸藏NOx,并且在浓混合气氛下放出吸蔵的NOx而还原净化为N2。一般,柴油机在稀混合气氛下运转。因此,LNT31通过后述的LNT强制再生控制部(再生控制单元)44来从排气管内喷射阀22喷射燃料而临时成为浓混合气氛,由此进行将NOx还原净化为N2的再生控制。
DPF(柴油颗粒过滤器)32为公知的构造,其构成为,将由陶瓷制的蜂窝构造体形成的大量的小室内作为气体流路,并交替地封闭上游侧和下游侧。该DPF32捕集废气所包含的PM(粒状物),并且通过后述的PM强制再生控制部(再生控制单元)43来升温到PM燃烧温度(例如500℃程度),由此进行将堆积的PM燃烧除去的再生控制。
氧化催化剂35构成为,在金属或陶瓷制的具有蜂窝构造的载体上载持铂(Pt)等。该氧化催化剂35通过后述的后喷射而升温到氧化催化剂活性温度(例如200℃~250℃)以上。
轻油分解催化剂36将轻油的长链成分进行分解而分解为短链的HC成分、CO成分,其构成为,在金属或陶瓷制的具有蜂窝构造的载体上作为主要成分而载持钯(Pd)。该轻油分解催化剂36通过基于后述的控制ECU40的发动机喷射控制部(内燃机喷射控制单元)42的后喷射来使氧化催化剂35升温,当通过该氧化催化剂35的废气温度升温到催化剂活性温度(例如200℃~250℃)以上时,将在LNT31、DPF32的再生控制时从排气管内喷射阀22喷射的燃料(轻油)迅速热解为短链的HC、CO,并向下游侧的LNT31、DPF32送出。
在本实施方式中,该氧化催化剂35和轻油分解催化剂36的容量,分别被设定为能够允许柴油机10的运转状态为怠速~低负载时的S/V(例如100000hr-1程度)的值、即能够确保催化剂活性的上限值。此外,在氧化催化剂35和轻油分解催化剂36使用了金属制的载体的情况下,通过与排气通路11成为一体构造,能够使废气净化装置1更紧凑。
接着,对本实施方式的控制ECU40进行说明。
控制ECU40构成为,具备公知的CPU、ROM、RAM、输入口以及输出口等。此外,发动机转速传感器(未图示)、油门开度传感器(未图示)、排气温度传感器24等的输出信号,在被A/D变换之后输入到控制ECU40中。
如图2所示,本实施方式的控制ECU40,作为一部分的功能要素而具有排气温度推测部(排气温度推测单元)41、发动机喷射控制部(内燃机喷射控制单元)42、PM强制再生控制部(再生控制单元)43以及LNT强制再生控制部(再生控制单元)44。这些功能要素在本实施方式中作为包含于一体的硬件即控制ECU40的功能要素进行说明,但也能够将这些功能要素中的任意一部分设置为另外的硬件。
排气温度推测部(排气温度推测单元)41推测从柴油机10排出的废气的温度。根据预先制作的表示燃料喷射量和废气量之间的关系的温度特性映射(未图示),来计算该推测温度。
发动机喷射控制部(内燃机喷射控制单元)42控制柴油机10的燃料喷射。更详细地,在排气温度推测部41的推测温度Tc为阈值(例如200℃)以下时,发动机喷射控制部42向燃料喷射阀9输出如下的控制信号:在1个燃烧行程(进气-压缩-爆发-排气)中,进行以预喷射、主喷射、延迟喷射、后喷射的多次来喷射燃料的多级喷射。另一方面,在排气温度推测部41的推测温度Tc比阈值(200℃)高时,发动机喷射控制部42向燃料喷射阀9输出如下的控制信号:在1个燃烧冲程中,进行将对应于运转状态的适量的燃料进行1次喷射的通常喷射。
此外,发动机喷射控制部42构成为,当通过该多级喷射中的在规定时期喷射少量燃料的后喷射来将氧化催化剂35的催化剂温度升温为阈值(200℃)以上,并且将氧化催化剂35的催化剂温度保持为200℃~250℃以上(以下也称为目标温度)时,将多级喷射切换为通常喷射而控制柴油机10的燃料喷射。另外,在该控制中利用的废气温度,也能够使用排气温度传感器24的检测值Ts,来代替排气温度推测部41的推测温度Tc。
PM强制再生控制部(再生控制单元)43进行将DPF32所捕集而堆积的PM升温到PM燃烧温度(例如500℃程度)而燃烧除去的PM强制再生控制。具体地,在排气后处理装置30的上游侧和下游侧设置有压力传感器(未图示),在该压力传感器的差压成为规定值以上、且推测温度Tc或检测值Ts比阈值(200℃)高的情况下,进行从排气管内喷射阀22向轻油分解催化剂36供给燃料的PM强制再生控制。被供给到轻油分解催化剂36的该燃料(轻油),在200℃以上的温度条件下被促进热解(气化),并在被热解了的状态下供给到下游侧的DPF32。
LNT强制再生控制部(再生控制单元)44进行使空燃比临时成为浓混合气氛的LNT31的强制再生控制。具体地,在根据将发动机转速和负载作为参数的NOx排出映射(未图示)而积算的NOx吸蔵量成为规定值以上、且推测温度Tc或检测值Ts比阈值(200℃)高的情况下,通过从排气管内喷射阀22喷射燃料,来实施临时成为浓混合气氛的燃料过量供给。通过该燃料过量供给,LNT31所吸蔵的NOx被还原净化。另外,也可以以规定的周期来定期地进行该LNT强制再生控制。
本发明一个实施方式的废气净化装置1如以上那样构成,因此例如按照图3、4所示的流程来进行以下那样的控制。
首先,根据图3所示的PM强制再生控制流程进行说明。
在步骤(以下将步骤简单记载为S)100中,根据压力传感器的差压来确认DPF32所捕集的PM捕集量是否超过了允许值。在差压为规定值以上的情况、即PM捕集量超过了允许值的情况下,进入到S110。另一方面,在差压比规定值小的情况、即PM捕集量未超过允许值的情况下,主控制返回。
在S110中,确认排气温度推测部41的推测温度Tc是否为阈值(200℃)以下。如果推测温度Tc为阈值以下,则判断为需要氧化催化剂35的升温,并进入到S120。另一方面,在推测温度Tc比阈值高的情况下,判断为不需要氧化催化剂35的升温,并进入到S150,执行PM强制再生控制并返回。另外,在该判断中也能够使用排气温度传感器24的检测值Ts。
在S120中,通过发动机喷射控制部42执行后喷射,氧化催化剂35的催化剂温度被升温为阈值(200℃)以上。
在S130中,在S120中所升温的氧化催化剂35的催化剂温度被保持为目标温度(200℃~250℃以上),并中止多级喷射。另外,当氧化催化剂35的催化剂温度被保持为目标温度(200℃~250℃以上)时,在排气管内喷射阀22附近流动的废气温度、轻油分解催化剂36的催化剂温度,也同样被升温到该目标温度(200℃~250℃以上)并保持。
在S140中,通过PM强制再生控制部43来执行从排气管内喷射阀22喷射燃料而升温到PM燃烧温度(例如500℃程度)的PM强制再生控制,主控制返回。
接着,对图4所示的LNT31的强制再生控制流程进行说明。
在S200中,确认根据NOx排出映射(未图示)而积算的NOx吸蔵量是否为规定值以上。在NOx吸蔵量为规定值以上的情况下,判断为LNT31的NOx吸蔵能力为饱和状态,进入到S210。另一方面,在NOx吸蔵量比规定值小的情况下,主控制返回。
在S210中,确认排气温度推测部41的推测温度Tc是否为阈值(200℃)以下。如果推测温度Tc为阈值以下,则判断为需要氧化催化剂35的升温,进入到S220。另一方面,在推测温度Tc比阈值高的情况下,判断为不需要氧化催化剂35的升温,进入到S250,执行LNT强制再生控制并返回。另外,在该判断中也能够使用排气温度传感器24的检测值Ts。
在S220中,通过发动机喷射控制部42执行后喷射,氧化催化剂35的催化剂温度被升温为阈值(200℃)以上。
在S230中,在S220中所升温的氧化催化剂35的催化剂温度被保持为目标温度(200℃~250℃以上),并中止多级喷射。另外,当氧化催化剂35的催化剂温度被保持为目标温度(200℃~250℃以上)时,在排气管内喷射阀22附近流动的废气温度、轻油分解催化剂36的催化剂温度,也同样被升温到该目标温度(200℃~250℃以上)并保持。
在S240中,通过LNT强制再生控制部44来执行从排气管内喷射阀22喷射燃料而成为浓混合气氛的LNT强制再生控制(燃料过量供给),主控制返回。
通过上述那样的构成,根据本发明一个实施方式的废气净化装置1,实现以下那样的作用、效果。
即,在PM强制再生控制、LNT强制再生控制时,在排气温度推测部41的推测温度Tc为阈值(例如200℃)以下的情况下进行后喷射,氧化催化剂35和轻油分解催化剂36的催化剂温度被升温到目标温度(例如200℃~250℃以上)并保持。在该温度条件下,从排气管内喷射阀22喷射的燃料(轻油)向HC、CO的热解被促进。
因此,能够有效地抑制由于从排气管内喷射阀22喷射的燃料附着在轻油分解催化剂36以及下游侧的LNT31、DPF32的前面而产生的过滤器堵塞、由于附着在排气管内的燃料挥发而产生的白烟的产生等。当然,能够从低排气温度时、低负载时起进行排气管内喷射阀22的排气喷射,因此能够改善PM强制再生、LNT强制再生的低温特性。
此外,柴油机10的燃料喷射,在排气温度推测部41的推测温度Tc为阈值(200℃)以下的情况下以多级喷射来进行,并且当氧化催化剂35的催化剂温度被保持为阈值(200℃)以上时,迅速中止该多级喷射而向通常喷射切换。
因此,能够将喷射图形与通常喷射相比被大幅度地延迟的多级喷射仅限制在氧化催化剂35的升温时,因此也能够同样地限制在多级喷射的加速时等引起的燃烧变得不稳定的状态,能够有效地减少加速不良等引起的驾驶性能的恶化。
此外,氧化催化剂35及轻油分解催化剂36的容量,分别被设定为能够允许柴油机10的运转状态为怠速~低负载时的S/V(例如100000hr-1)的程度的容量。
因此,能够将废气净化装置1的制造成本的增加抑制为最小限度。
另外,本发明并非限定于上述实施方式,在不脱离本发明的主旨的范围内,能够适宜地变形而实施。
例如,如图5所示,还能够构成为,在轻油分解催化剂36的上游部设置电加热器37,并通过设置在控制ECU40中的电加热器控制部(未图示)来控制该电加热器37的工作。在排气温度传感器24的检测值Ts或排气温度推测部41的推测温度Tc为阈值(200℃)以下时,只要使电加热器37工作而使轻油分解催化剂36升温,则能够促进基于排气喷射的燃料(轻油)的热解,因此能够从排气温度的低温时起有效地进行PM强制再生、LNT强制再生。
此外,如图6所示,还能够配置SCR(SCR选择还原型催化剂)33来代替构成排气后处理装置30的LNT31。在该情况下,在SCR33的上游侧设置尿素喷射阀(未图示)即可。
此外,在本实施方式中,对排气后处理装置30从上游侧起依次设置有LNT31、DPF32或者SCR33、DPF32的情况进行了说明,但不一定需要以该顺序进行配置,也能够适宜地替换该顺序而进行配置。
符号的说明
1   废气净化装置
10  柴油机(内燃机)
11  排气通路
22  排气管内喷射阀(排气通路燃料喷射单元)
30  排气后处理装置
31  LNT(LNT吸藏还原型催化剂)
32  DPF
33  SCR(SCR选择还原型催化剂)
35  氧化催化剂(第一催化剂)
36  轻油分解催化剂(第二催化剂)
41  排气温度推测部(排气温度推测单元)
42  发动机喷射控制部(内燃机喷射控制单元)
43  PM强制再生控制部(再生控制单元)
44  LNT强制再生控制部(再生控制单元)

Claims (5)

1.一种废气净化装置,其特征在于,
具备:
排气后处理装置,设置在内燃机的排气通路上;
排气通路燃料喷射单元,设置在上述排气后处理装置上游侧的排气通路上;
第一催化剂,设置在上述排气通路燃料喷射单元上游侧的排气通路上;
第二催化剂,设置在上述排气通路燃料喷射单元和上述排气后处理装置之间的排气通路上,将从上述排气通路燃料喷射单元喷射的燃料进行热解;
排气温度推测单元,检测或推测上述内燃机的排气温度并输出;
内燃机喷射控制单元,控制上述内燃机的燃料喷射;以及
再生控制单元,对从上述排气通路燃料喷射单元喷射燃料而进行的上述排气后处理装置的再生进行控制,
上述内燃机喷射控制单元在上述再生控制单元的再生控制时,在上述排气温度推测单元的输出值为阈值以下的情况下,为了使上述第二催化剂的催化剂温度升温到阈值以上,而以包括向上述第一催化剂供给燃料的后喷射在内的多级喷射来控制上述内燃机的燃料喷射。
2.如权利要求1所述的废气净化装置,其特征在于,
进一步具备:设置在上述第二催化剂上游部的电加热器;以及控制上述电加热器的工作的电加热器控制部,
上述电加热器控制部在上述再生控制单元的再生控制时,在上述排气温度推测单元的输出值为阈值以下的情况下,使上述电加热器工作。
3.如权利要求1或2所述的废气净化装置,其特征在于,
上述第一催化剂以及上述第二催化剂具有金属制的载体,并且与上述排气通路一体形成。
4.如权利要求1~3中任一项所述的废气净化装置,其特征在于,上述排气后处理装置具备DPF和LNT吸藏还原型催化剂。
5.如权利要求1~3中任一项所述的废气净化装置,其特征在于,上述排气后处理装置具备DPF和SCR选择还原型催化剂。
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