CN105765188B - 用于经催化基材的车载诊断系统和诊断方法 - Google Patents
用于经催化基材的车载诊断系统和诊断方法 Download PDFInfo
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- CN105765188B CN105765188B CN201480064533.4A CN201480064533A CN105765188B CN 105765188 B CN105765188 B CN 105765188B CN 201480064533 A CN201480064533 A CN 201480064533A CN 105765188 B CN105765188 B CN 105765188B
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- 229910002091 carbon monoxide Inorganic materials 0.000 description 15
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- 239000007787 solid Substances 0.000 description 1
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- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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- 229910052727 yttrium Inorganic materials 0.000 description 1
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- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring 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
-
- 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
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
- F01N3/10—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
- F01N3/103—Oxidation catalysts for HC and CO only
-
- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
-
- 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
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
- F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
- F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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Abstract
公开了用于内燃机排气系统的车载诊断系统。系统包括具有经催化区域和未经催化区域的经催化基材、第一传感器和第二传感器。第一传感器位于经催化基材的经催化区域内并且第二传感器位于经催化基材的未经催化区域内。还公开了用于车载诊断经催化基材的方法。
Description
技术领域
本发明涉及用于经催化基材,特别是柴油氧化催化剂的车载诊断系统,和用于排气系统中的经催化基材的车载诊断的方法。本发明还涉及排气系统和车辆。
背景技术
内燃机产生了包含各种污染物的排气气体,所述污染物包括烃、一氧化碳、氮氧化物(“NOx”)、硫氧化物和颗粒物质。日益严格的国家和地区立法已经降低了可以从这样的柴油或汽油发动机排放的污染物的量。已经开发了包含各种催化剂组分的排气系统来实现这些低排放水平。
随着这些排气系统的复杂性的增加,已经开发了车载诊断来使得车辆拥有者理解排气系统的操作条件。在机动车的背景下,车载诊断 (“OBD”)是用来描述自诊断的通称,并且报道车辆的系统的能力,由连接至适合的电子管理系统的传感器网络提供。OBD系统的早期实例如果检测到问题会简单地点亮故障指示灯,但是其没有提供对于问题本质的信息。更现代的OBD系统使用标准化的数字连接端口并且能够提供对于标准化诊断故障码和选择的实时数据的信息,其能够快速表明问题并且分辨车辆的系统。
除了减少来自车辆的发动机排放物,较新的立法还要求增加车载诊断(OBD)的使用以在故障或排放系统劣化(其会导致排放物超过强制性阈值;例如,颗粒物质、一氧化碳、烃和/或NOx水平高于设定限度(通常以g/km的污染物排放计))的情况下通知司机。车载诊断的通常方法包括将传感器放置在催化组分之前并且将另一传感器放置在催化组分之后,并且测量传感器值差异以确定组分是否适当地发挥功能。例如,美国专利号6,739,176教导了用于检查用于柴油发动机的排气气体纯化催化剂的操作性的方法,其包括将CO传感器放置在催化剂上游和下游以及将温度探头放置在催化剂下游。美国专利号4,029,472 公开了用于检测排气气体中可燃物的定量含量的热电传感器,其具有两个热电偶接点,其中与接点之一相邻的排气气体氧化催化剂提供了在陶瓷体暴露于排气气体流时的接点温差。两个接点之间的输出差与排气气体中残留可燃物的浓度成比例。
美国专利号8,127,537公开了排气系统,其包括三元催化剂(TWC) 和单一的λ传感器。TWC在从入口端延伸的通道的至少部分长度中具有催化剂组合物,所述入口端具有(相对于TWC的其余部分中的催化剂组合物)降低的氧储存活性或没有氧储存活性。单一的λ传感器基本上仅与首先与具有降低的氧储存活性或没有氧储存活性的TWC组合物接触的排气气体接触。美国专利号8,205,437教导排气系统,其包括用催化剂涂覆的整料基材,和置于部分地由整料基材的外壁限定的孔中的第一传感器。相对于基材的其余部分中的催化剂组合物,从上游端延伸的通道的至少部分长度中的催化剂组合物具有对于催化剂组合物所意图的反应来说增加的活性。布置传感器,使得其基本上仅与首先接触具有增加的活性的催化剂组合物的排气气体接触。而且,美国专利号8,327,632公开了排气系统,其具有催化烟灰过滤器(CSF)、控制单元和经催化传感器。该系统可以增加流入CSF中的排气气体中的烃(HC)和/或一氧化碳(CO)含量,导致HC和/或CO在CSF中燃烧, CSF的温度增加,和CSF上收集的颗粒物质的燃烧。
申请人发现放置于催化剂组分上游和下游的传感器并不足够准确,这是因为车辆排气条件的瞬时性本质,以及相比于排气气体温度的瞬时变化,通常发现就柴油排气气体而言的放热相对小。
就任何汽车系统和方法而言,期望的是获得车载诊断系统的进一步改善。申请人已经发现了用于排气系统中的经催化基材的新型车载诊断系统。
发明内容
本发明为用于内燃机排气系统的车载诊断系统。车载诊断系统包括具有经催化区域和未经催化区域的经催化基材、第一传感器和第二传感器。第一传感器位于经催化基材的经催化区域内并且第二传感器位于经催化基材的未经催化区域内。
本发明还包括用于车载诊断经催化基材的方法。该方法包括测量第一传感器处经催化区域的温度和第二传感器处未经催化区域的温度;计算温度差;和确定经催化基材是否通过或未通过诊断测试,其通过比较该温度差与就催化剂基材通过和未通过而言的预期差进行。该方法可以使用本发明的车载诊断系统进行。
本发明还提供排气系统,通常用于内燃机或车辆,其包括本发明的车载诊断系统。
本发明进一步提供车辆,其包括内燃机和本发明的车载诊断系统或本发明的排气系统。
附图说明
图1显示了用于柴油氧化催化剂基材的热传感器的两种不同的布置,1A显示了本发明的一个实施方案并且1B显示了对比例排布。
具体实施方式
本发明的车载诊断系统包括具有经催化区域和未经催化区域的经催化基材。
经催化基材包括包含催化剂组分的基材。催化剂组分通常为载体涂层,其包含一种或多种无机氧化物和一种或多种金属。经催化基材用于清洁内燃机中形成的排气气体的方法。
经催化基材的基材优选为整料基材。整料基材优选为陶瓷基材或金属基材。陶瓷基材可以由任何适合的耐火材料制造,所述耐火材料例如为氧化铝、二氧化硅、氧化钛、二氧化铈、氧化锆、氧化镁、沸石、氮化硅、碳化硅、锆硅酸盐、镁硅酸盐、硅铝酸盐和金属硅铝酸盐(例如堇青石和锂辉石),或其中任何两者或更多者的混合物或混合氧化物。金属基材可以由任何适合的金属,并且特别是耐热性金属和金属合金例如钛和不锈钢以及除了其它痕量金属(通常为稀土金属)之外包含铁、镍、铬和/或铝的铁素体合金制造。
基材优选为流通式基材,但是也可以为过滤式基材。流通式基材优选具有蜂窝状结构,所述蜂窝状结构具有轴向穿过基材并且延伸贯穿基材的多个小的平行薄壁通道。如果基材为过滤式基材,优选为壁流式整料过滤器。壁流式过滤器的通道交替地封堵,其允许排气气体物流从入口进入通道,并且然后流动穿过通道壁,并且从通向出口的不同的通道离开过滤器。因此,排气气体物流中的颗粒物捕集在过滤器中。
经催化基材上的催化剂通常作为载体涂层添加至基材,所述载体涂层通常包含多种组分,包括一种或多种无机氧化物和一种或多种金属。无机氧化物最通常包括第2、3、4、5、13和14族元素的氧化物。有用的无机氧化物优选表面积为10-700m2/g,孔体积为0.1-4mL/g,并且孔径为约10-1000埃。无机氧化物优选为氧化铝、二氧化硅、氧化钛、氧化锆、氧化铌、钽氧化物、钼氧化物、钨氧化物、稀土氧化物(特别是二氧化铈或钕氧化物),或其中任意两者或更多者的混合氧化物或复合氧化物,例如二氧化硅-氧化铝、二氧化铈-氧化锆或氧化铝-二氧化铈-氧化锆并且也可以为沸石。
一种或多种金属通常包括一种或多种铂族金属(PGM),优选铂、钯和/或铑。一种或多种金属也可以包括金属氧化物例如碱土金属(例如钡、钙、锶和镁)、碱金属(例如钾、钠、锂和铯)、稀土金属(例如镧、钇、镨和钕)的氧化物,或其组合,以及金属碳酸盐、金属硫酸盐、金属硝酸盐、金属乙酸盐和金属氢氧化物。
尽管可以将任何经催化基材用于本发明,经催化基材优选为柴油氧化催化剂(DOC)。
DOC组分为本领域中公知的。DOC设计用于将CO氧化成CO2并且将气相烃(HC)和柴油颗粒物的有机级分(可溶的有机级分)氧化成 CO2和H2O。常规的DOC组分包括高表面积无机氧化物载体,例如氧化铝、二氧化硅-氧化铝和沸石上的铂并且任选还有钯。
经催化基材具有总体积。就经催化基材而言通常的总体积为约1.0- 约15L。经催化基材的未经催化区域优选占经催化基材总体积的小于50%,更优选经催化基材总体积的小于25%,并且甚至更优选经催化基材总体积的小于10%。
经催化基材的未经催化区域可以为基材的未涂覆区域,例如仅裸露基材的区域,但是优选未经催化区域为用惰性载体涂层涂覆的基材部分。惰性载体涂层不包含用于催化烃或一氧化碳的氧化的催化活性金属(例如,PGM或其它过渡金属)。优选地,惰性载体涂层由一种或多种无机氧化物例如氧化铝、二氧化硅、氧化钛、氧化锆、氧化铌、稀土氧化物(特别是二氧化铈或钕氧化物),或其中任意两者或更多者的混合氧化物或复合氧化物,例如二氧化硅-氧化铝、二氧化铈-氧化锆或氧化铝-二氧化铈-氧化锆组成,并且也可以为沸石。
可以优选将惰性载体涂层用于未经催化区域,因为其可以得到更均等的未经催化和经催化区域的热质量来改善瞬时温差准确性。将惰性载体涂层用于未经催化区域也可以导致两个区域的背压更均等,以得到更平均的流动分布。
通常,经催化基材具有入口端和出口端,具有从入口端延伸至出口端的轴向长度。未经催化区域优选从经催化基材的入口端沿着经催化基材的部分轴向长度延伸。更优选地,未经催化区域从经催化基材的入口端延伸经催化基材轴向长度的约50%或更少。
未经催化区域可以沿着经催化基材径向长度的100%延伸。优选地,在未经催化区域沿着经催化基材的整个径向长度延伸时,排气系统进一步包括位于经催化基材下游的另外的氧化催化剂。该另外的氧化催化剂可以为柴油氧化催化剂,但是优选为催化烟灰过滤器(CSF)。催化烟灰过滤器(CSF)为过滤式基材,其用与DOC组成和功能相似的催化剂涂覆。其也可以有助于燃烧柴油颗粒物质。通常的CSF催化剂组分包括铂、钯和高表面积无机氧化物。
经催化基材下游的另外的氧化催化剂可以用于清除已经通过未经催化区域而未氧化的排放物(例如,烃和CO)。
通常,具有高得多的起燃温度的第二经催化区域可以替代未经催化区域使用。这是通过,例如,使用具有相比于经催化基材的经催化区域低得多的PGM负载量的第二经催化区域实现的。这样的排布的潜在优点是以较高温度通过该第二经催化区域的排放物被转化,但是在OBD测量所需的条件期间不会产生显著的放热,以至于不会干扰 OBD。
可以通过任何常规的装置生产经催化基材。例如,用于产生由经催化区域和未经催化区域组成的经催化基材的差异涂覆(differential coating)可以通过封阻(containment)装置实现,其可以成型成基材的空白区,以便涂覆不在那些区中进行,而是由封阻装置仅对未阻挡的区进行。此外,封阻装置可以在内部分划,从而分开不同的用于涂覆的液体,或者部分可以设为空白以防止涂覆。
本发明的车载诊断系统还包括第一传感器和所述第二传感器。第一传感器位于经催化基材的经催化区域内。第二传感器位于经催化基材的未经催化区域内。可用于本发明的车载诊断系统的传感器包括温度传感器、烃传感器、氧传感器、λ传感器、氮氧化物(NOx)传感器、和一氧化碳传感器。温度传感器,例如热电偶是特别是优选。
优选第一传感器和第二传感器以相似的长度沿着经催化基材的轴向长度定位。更优选地,它们沿着经催化基材轴向长度位于彼此的约 1英寸(2.54cm)内,并且甚至更优选以相同长度沿着经催化基材轴向长度定位。
本发明的车载诊断系统优选用于检测位于排气系统中的经催化基材的可能的劣化。通过两个记录的传感值(例如,温度)之间的差测量经催化基材燃烧排气气体中的烃和一氧化碳的能力,通过比较该差与就经催化基材通过和未通过而言的预期差得到直接催化剂OBD测量。
第一传感器和第二传感器的传感值(例如,温度、CO水平)可以连续测量,并且如果第一传感值和第二传感值之间的差落在低于预定值,这会触发故障指示灯(MIL)来表明经催化基材的性能已经落在低于设定水平。例如,随着经催化基材性能的劣化,经催化区域的测量温度开始接近未经催化区域的测量温度。随着温度差落在低于设定值(例如,10℃或更少的温度差),则经催化基材未通过诊断测试。
本发明还涵盖了用于车载诊断用于内燃机的排气系统中的经催化基材的方法。该方法包括测量第二传感器处未经催化区域中的温度(或任何其它传感值,例如O2量或CO量)和第一传感器处经催化区域中的温度(或任何其它传感值例如O2量或CO量)。通过从第一传感器的温度中减去第二传感器的温度计算温度差。然后确定经催化基材是否通过或未通过诊断测试,其通过比较该温度差与就催化剂基材通过和未通过而言的预期差进行。例如,大于10℃的温度差可以表明催化剂基材通过,而10℃或更小的温度差可以表明催化剂基材未通过。
在本发明的方法中,优选的是第一传感器和第二传感器以相似的长度沿着经催化基材的轴向长度定位。更优选地,第一热传感器沿着经催化基材轴向长度位于第二热传感器的1英寸内;并且更优选以相同轴向长度定位。尽管第一热传感器和第二热传感器优选以相似长度沿着经催化基材轴向长度定位,它们可以优选位于基材本身上不同的位置处,例如,彼此位于基材的相对侧上。
此外,本发明的方法进一步包括在温度差(或任何其它传感值,例如O2量或CO量,之间的差)降低到低于预定值时触发故障指示灯。由对减活的催化剂而言到的温度差设定预定值。优选地,温差数据可以输入至算法,其对经过一段时间的温度变化进行加和或平均。以该方式,故障指示灯不会被一个错误数据点触发。
具有经催化区域和未经催化区域的经催化基材可以为柴油氧化催化剂(DOC)或催化烟灰过滤器(CSF)。优选经催化基材为DOC。
本发明的排气系统包括车载诊断系统(即,包括经催化基材)。本发明的排气系统可以进一步包括排放物控制装置(即除了经催化基材之外的排放物控制装置),例如另外的氧化催化剂(例如DOC、CSF或ASC)。排放物控制装置优选位于经催化基材下游。
排放物控制装置可以选自柴油颗粒过滤器(DPF)、贫燃NOx捕集器 (LNT)、贫燃NOx催化剂(LNC)、选择性催化还原(SCR)催化剂、柴油氧化催化剂(DOC)、催化烟灰过滤器(CSF)、选择性催化还原过滤 (SCRFTM)催化剂、氨逸出催化剂(ASC)和其中两种或更多种的组合。这样的排放物控制装置都是本领域中公知的。
一般,内燃机可以为火花点火式发动机(例如汽油的或汽油发动机) 或压燃式发动机(例如柴油发动机)。优选内燃机为压燃式发动机,更优选柴油发动机。
如果本发明的排气系统包括SCR催化剂或SCRFTM催化剂,则排气系统可以进一步包括用于将含氮还原剂,例如氨,或氨前体,例如尿素或甲酸铵,优选尿素,在氧化催化剂下游和SCR催化剂或SCRFTM催化剂上游注入排气气体的注射器。这样的注射器可以流体连接至含氮还原剂前体的源(例如罐)。将前体阀门-控制地定量加入排气气体中可以通过适合地编程的发动机管理装置和由监测排气气体组成的传感器提供的闭路或开路反馈进行调整。也可以通过加热氨基甲酸铵(固体) 产生氨并且可以将产生的氨注入排气气体中。
作为注射器的替代或补充,氨可以原位产生(例如,在布置在SCR 催化剂或SCRFTM催化剂上游的LNT的富燃再生期间)。因此,排气系统可以进一步包括发动机管理装置,用于富集具有烃的排气气体。
在第一排气系统实施方案中,排气系统包括本发明的车载诊断系统(优选经催化基材为DOC),和催化烟灰过滤器(CSF)。这样的布置可以称为DOC/CSF。经催化基材之后通常是催化烟灰过滤器(CSF) (例如在其上游)。
第二排气系统实施方案涉及排气系统,其包括本发明的车载诊断系统(优选经催化基材为DOC)、催化烟灰过滤器(CSF)和选择性催化还原(SCR)催化剂。这样的布置可以称为DOC/CSF/SCR并且为优选的用于轻型柴油车辆的排气系统。经催化基材之后通常是催化烟灰过滤器(CSF)(例如在其上游)。催化烟灰过滤器之后通常是选择性催化还原(SCR)催化剂(例如在其上游)。含氮还原剂注射器可以布置在催化烟灰过滤器(CSF)和选择性催化还原(SCR)催化剂之间。
第三排气系统实施方案涉及排气系统,其包括柴油氧化催化剂 (DOC)、作为催化烟灰过滤器(CSF)的本发明(即车载诊断系统)的经催化基材,和选择性催化还原(SCR)催化剂。这也是DOC/CSF/SCR布置。柴油氧化催化剂(DOC)之后通常是本发明的氧化催化剂(例如在其上游)。本发明的经催化基材之后通常是选择性催化还原(SCR)催化剂 (例如在其上游)。含氮还原剂注射器可以布置在经催化基材和选择性催化还原(SCR)催化剂之间。
在第四排气系统实施方案中,排气系统包括本发明的车载诊断系统(优选经催化基材为DOC)、选择性催化还原(SCR)催化剂,和催化烟灰过滤器(CSF)或柴油颗粒过滤器(DPF)。该布置为DOC/SCR/CSF 或DOC/SCR/DPF。
在第四排气系统实施方案中,本发明的车载诊断系统之后通常是选择性催化还原(SCR)催化剂(例如在其上游)。含氮还原剂注射器可以布置在经催化基材和选择性催化还原(SCR)催化剂之间。选择性催化还原(SCR)催化剂之后是催化烟灰过滤器(CSF)或柴油颗粒过滤器 (DPF)(例如在其上游)。
第五排气系统实施方案包括本发明的车载诊断系统(优选经催化基材为DOC),和选择性催化还原过滤(SCRFTM)催化剂。这样的布置可以称为DOC/SCRFTM。经催化基材之后通常是选择性催化还原过滤 (SCRFTM)催化剂(例如在其上游)。含氮还原剂注射器可以布置在经催化基材和选择性催化还原过滤(SCRFTM)催化剂之间。
在上述第二至第五排气系统实施方案的每一个中,ASC催化剂可以布置在SCR催化剂或SCRFTM催化剂的下游(即,作为单独的基材整料),或更优选可以将在包含SCR催化剂的基材整料的下游或尾端上的区域用作用于ASC的载体。
以下实施例仅仅展示本发明。本领域技术人员会认识到在本发明的精神和权利要求的范围内的多种变体。
实施例
实施例1:制备具有经催化和未经催化区域的DOC
以50g/ft-3的负载量用包含铂和钯(Pt:Pd=2:1)的现有技术DOC涂层涂覆整料基材(118mm直径和140mm长度)。使用常规载体涂覆流程对基材的后部定量加入50%的涂层。使用常规精确涂覆流程(如根据第一定量加入的流程)对基材的前部定量加入其它50%的涂层,其具有空白区域(遮蔽),以生产DOC1。
实施例2:车辆测试比较
对装配有1.5L DOC(DOC1)和CSF的1.5L Euro5车辆进行车辆测试。在New EuropeDriving Cycle(NEDC)上评估DOC1,测量了排气温度和排放物。在CVS滚筒式测功试验台上进行排放物测量,装配所述CVS滚筒式测功试验台以对所有的规范化排放物测量催化剂前后的峰(modal)排放物。将两个热电偶加入至系统以根据常规方法测量 DOC前后的温度。此外,通过加入两个热电偶测试本发明的OBD,以自前面相同距离(35mm)并且以自侧面30mm的相同的径向位置将所述两个热电偶仔细定位在整料中。将一个热电偶定位在整料的常规涂覆区域中并且将另一个定位在整料的未涂覆区域中。图1A中显示了具有OBD热电偶的DOC1并且图1B中显示了放置常规催化剂的前后的热电偶。测试期间,测定安装在DOC的未经催化区域的热电偶和以相似轴向和径向位置安装在经催化区域中的热电偶之间的温度差;还测量催化剂前后温度之间的温度差。除了测试新鲜DOC催化剂,还使用水热烘箱老化调节新鲜DOC的活性,以便比较新鲜、寿命结束老化和OBD老化DOC催化剂的温度曲线。
结果显示,“被动”NEDC循环期间测量的温度差允许使用本发明的OBD系统分辨新鲜和老化DOC(相比于将热电偶放置在DOC上游和下游的系统)。相比于使用DOC上游和下游热电偶监测整个DOC 体积,本发明的OBD系统显示出平均温度改变(平均ΔT)和峰值温度改变(最大ΔT)两者的改善的分辨率。
表1:本发明的系统与前后热传感器系统的比较
Claims (14)
1.用于内燃机排气系统的车载诊断系统,该系统包括(1)具有经催化区域和未经催化区域的经催化基材;(2)第一传感器;和(3)第二传感器,其中第一传感器位于经催化基材的经催化区域内并且第二传感器位于经催化基材的未经催化区域内,其中所述经催化基材具有总体积,并且所述未经催化区域具有小于所述总体积的25%的体积,其中所述经催化基材具有入口端和出口端,和从入口端延伸至出口端的轴向长度,并且所述未经催化区域从经催化基材的入口端延伸,延伸距离小于经催化基材轴向长度的60%。
2.根据权利要求1所述的车载诊断系统,其中所述未经催化区域的体积小于经催化基材的总体积的10%。
3.根据权利要求1所述的车载诊断系统,其中所述未经催化区域沿着经催化基材径向长度的100%延伸。
4.根据权利要求1所述的车载诊断系统,其进一步包括位于经催化基材下游的另外的氧化催化剂。
5.根据权利要求1所述的车载诊断系统,其中所述未经催化区域用惰性载体涂层涂覆。
6.根据权利要求1所述的车载诊断系统,其中所述第一传感器和所述第二传感器以相似的长度沿着经催化基材的轴向长度定位。
7.根据权利要求1所述的车载诊断系统,其中所述第一传感器和所述第二传感器都为热传感器。
8.根据权利要求1所述的车载诊断系统,其中所述第一传感器和所述第二传感器都为热电偶。
9.排气系统,其包括根据前述权利要求中任一项所述的车载诊断系统。
10.车辆,其包括内燃机,和根据权利要求1-8中任一项所述的车载诊断系统或根据权利要求9所述的排气系统。
11.用于车载诊断用于内燃机的排气系统中的经催化基材的方法,其中经催化基材具有经催化区域和未经催化区域,并且第一传感器位于经催化区域内并且第二传感器位于未经催化区域内,其中所述经催化基材具有总体积,并且所述未经催化区域具有小于所述总体积的25%的体积,其中所述经催化基材具有入口端和出口端,和从入口端延伸至出口端的轴向长度,并且所述未经催化区域从经催化基材的入口端延伸,延伸距离小于经催化基材轴向长度的60%,该方法包括:
(a)测量第一传感器处经催化区域的温度和第二传感器处未经催化区域的温度;
(b)计算经催化区域的温度和未经催化区域的温度之间的温度差;和
(c)确定经催化基材是否通过或未通过诊断测试,其通过比较所述温度差与就催化剂基材通过或未通过而言的预期差进行。
12.根据权利要求11所述的方法,其中所述经催化基材具有入口端和出口端,和从入口端延伸至出口端的轴向长度,并且所述第一传感器和所述第二传感器以相同的长度沿着经催化基材的轴向长度定位。
13.根据权利要求11或权利要求12所述的方法,其进一步包括在比较温度差之后经催化基材未通过诊断测试时触发故障指示灯。
14.根据权利要求11所述的方法,其使用根据权利要求1-8中任一项所述的车载诊断系统。
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RU2672013C2 (ru) | 2018-11-08 |
GB201418220D0 (en) | 2014-11-26 |
CN105765188A (zh) | 2016-07-13 |
BR112016008295B1 (pt) | 2022-07-19 |
RU2016118637A (ru) | 2017-11-21 |
WO2015056004A1 (en) | 2015-04-23 |
JP2016533448A (ja) | 2016-10-27 |
GB2520174B (en) | 2017-11-01 |
GB2520174A (en) | 2015-05-13 |
KR20160070127A (ko) | 2016-06-17 |
EP3058190A1 (en) | 2016-08-24 |
US20150101317A1 (en) | 2015-04-16 |
DE102014114976A1 (de) | 2015-04-16 |
DE102014114976B4 (de) | 2016-12-15 |
RU2016118637A3 (zh) | 2018-06-20 |
BR112016008295A2 (zh) | 2017-08-01 |
US9528423B2 (en) | 2016-12-27 |
JP6446445B2 (ja) | 2018-12-26 |
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