CN1989321A - 排气净化装置的nox降低率测定方法 - Google Patents
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- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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Abstract
通过添加喷嘴(7)向装入在柴油机(1)的排气路径(5)中的NOx还原催化剂(6)的上游侧喷射尿素水(U),以实现包含在排出气体(G)中的NOx的还原净化,在这种情况下,使用取决于排出气体(G)的流量以及排气温度的一次响应模型对添加喷嘴(7)上游侧的NOx浓度传感器(9)的测量值与NOx还原催化剂(6)下游侧的NOx浓度传感器(12)的测量值双方进行修正,之后,根据这些NOx浓度修正值来求NOx降低率,从而更正在排出气体(G)流量较少的情况下下游侧的NOx浓度传感器(12)的测量值相对于上游侧的NOx浓度传感器(9)的测量值的时间延迟、以及在排气温度较低的情况下由NOx还原处理速度的降低引起的误差。
Description
技术领域
本发明涉及排气净化装置的NOx降低率测定方法。
背景技术
以往提出了如下一种排气净化装置,其在车辆用柴油机的排气路径中装入选择还原催化剂(NOx还原催化剂),将比氨更易于处理的尿素水用为还原剂,以谋求NOx排出浓度的降低,该选择还原催化剂即使在氧气共存状态下,也可选择性地使氮氧化物(NOx)与还原剂反应(例如,参考专利文献1、2)。
这种排气净化装置具备喷嘴(还原剂添加机构),以便向着NOx还原剂的上游侧添加尿素水,在催化剂温度超过大约200℃的状态下添加尿素水时,该尿素水分解为氨和二氧化碳,接着,通过NOx还原催化剂和氨对包含在排出气体中的NOx进行还原处理。
此外,在剩余的氨暂时附着在NOx还原催化剂上后,有助于NOx的还原处理。
专利文献1:特开2002-161732号公报
专利文献2:特表2002-513110号公报。
在上述排气净化装置中,根据还原剂添加位置上游侧的NOx浓度测量值与催化剂下游侧的NOx浓度测量值之差来求出NOx降低率,根据该降低率控制尿素水的消耗量和应向NOx还原催化剂上游侧添加的尿素水的量。
可是在排气流量较少的情况下,下游侧的NOx浓度测量值相对于上游侧的NOx浓度测量值的时间延迟变大,在排气温度较低的情况下,NOx的还原处理速度变低,所以仅通过从上游侧的NOx浓度测量值减去下游侧的NOx浓度测量值,不能精度良好地检测NOx降低率。
发明内容
本发明是鉴于上述情况而作出的,目的是可高精度地测定排气净化装置的NOx降低率。
为了实现上述目的,本发明是一种排气净化装置的NOx降低率测定方法,向装入在发动机排气路径中的NOx还原催化剂的上游侧添加还原剂,将排出气体中的NOx还原净化,使用取决于排气流量以及排气温度的一次响应模型对从还原剂添加位置上游侧的NOx浓度测量值与催化剂下游侧的NOx浓度测量值进行修正,根据这些NOx浓度修正值求出NOx降低率。
在本发明中,在求解包含在发动机排出气体中的NOx的降低率时,利用取决于排气流量以及排气温度的一次响应模型,对还原剂添加前的排出气体的NOx浓度测量值与通过NOx还原催化剂后的NOx浓度测量值进行修正。
根据本发明的排气净化装置的NOx降低率测定方法,可取得如下所述的良好效果。
(1)因为以取决于排气流量以及排气温度的一次响应模型作为NOx浓度测量值的修正手段,所以,能更正排气流量较少的情况下的下游侧的NOx浓度测量值相对于上游侧的NOx浓度测量值的时间延迟、以及排气温度较低的情况下由NOx还原处理速度的降低引起的误差,可高精度地测定NOx降低率。
(2)通过利用一次响应模型进行的修正,可取得过滤器效果,所以可降低NOx浓度测量值的噪声。
(3)可以根据NOx降低率适当管理应向NOx还原催化剂的上游侧添加的还原剂的量,从而可实现还原剂的节约。
附图说明
图1是表示作为本发明对象的排气净化装置的一例的概念图。
图2是图1中的运算单元的框图。
图3是表示更正前的NOx测量值变化的曲线图。
图4是表示更正后的NOx测量值变化的曲线图。
附图标记说明
5排气路径
6还原催化剂
G排出气体
U尿素水(还原剂)
具体实施方式
下面,对本发明的实施例进行说明。
图1至图4表示本发明的一实施例,包括:NOx还原催化剂6,装入排气路径5,该排气路径5是从柴油机1的排气岐管2经过涡轮增压器3的涡轮4后的排出气体G流通的路径;添加喷嘴7,在该NOx还原催化剂6的上游侧对排出气体G喷吹尿素水U的雾;运算单元8。
在排气路径5中,NOx浓度传感器9位于添加喷嘴7的上游侧,温度传感器10位于NOx还原催化剂6的入口,温度传感器11以及NOx浓度传感器12位于NOx还原催化剂6的出口。
检测空气N的流量的空气流量传感器16,装入在从空气滤清器13通到涡轮增压器3的压缩机14的吸气路径15中。
将储存在箱体17中的尿素水U吸引送出的泵18,经电磁阀19连接在添加喷嘴7上。
运算单元8具备排气流量推定功能P、上游侧浓度修正功能Q、下游侧浓度修正功能R、NOx降低率计算功能V、以及还原剂吸附量计算功能W。
排气流量推定功能P为,根据发动机转速和燃料喷射量来推定排出气体G的流量,但还可以是根据由气流传感器16得到的空气N的流量(吸入空气量)和由温度传感器20得到的外界气体温度来推定排出气体G的流量。
上游侧浓度修正功能Q为,根据排气流量和利用温度传感器10得到的排气温度,以一次响应模型修正NOx浓度传感器9的测量值,下游侧浓度修正功能R为,根据排气流量和利用温度传感器11得到的排气温度,以一次响应模型修正NOx浓度传感器12的测量值。
上游侧浓度修正值=上游侧浓度测量值(m-x)(A+Bs)/(1+Cs)
下游侧浓度修正值=下游侧浓度测量值(n)(D+Es)/(1+Fs)
A,B,C,D,E,F,x是系数,s是拉普拉斯算子,系数A,B,C,D,E,F,x均由实验得到,C,F是取决于排气温度的反应速度分量,x是取决于排气流量的时间延迟分量。
即,如图3所示,在某时间带内的NOx浓度传感器9、12各自的测量值变化曲线之间,包含有由上游侧传感器9到下游侧传感器12的距离和排出气体G的流速引起的时间延迟、或者由排气温度引起的NOx还原处理速度的误差,但是该时间延迟和误差都能通过上游侧浓度修正功能Q和下游侧浓度修正功能R来消除,如图4所示更正。
此外,通过利用一次响应模型进行的修正,可得到过滤器效果,所以可降低NOx浓度传感器9、12的测量值所包含的噪声。
NOx降低率计算功能V为,根据NOx浓度传感器9、12的修正值计算NOx降低率,还原剂吸附量计算功能W为,根据NOx降低率算出对NOx的还原作出了贡献的尿素水U的量,基于该计算值和从添加喷嘴7向排出气体G添加的尿素水U的量,求出氨向NOx还原催化剂6吸附的量。
即,可以排除时间延迟和还原处理速度的误差,而高精度地测定NOx降低率,此外,可适当管理应向NOx还原催化剂6的上游侧添加的尿素水U的量,实现尿素水U的节约。
另外,本发明的排气净化装置的NOx降低率测定方法,当然不仅限定于上述实施例,在不脱离本发明主旨的范围内可加以变更。
工业实用性
本发明的排气净化装置的NOx降低率测定方法可用于各种车辆。
Claims (1)
1.一种排气净化装置的NOx降低率测定方法,向装入在发动机排气路径中的NOx还原催化剂的上游侧添加还原剂,将排出气体中的NOx还原净化,其特征在于,使用取决于排气流量以及排气温度的一次响应模型对从还原剂添加位置上游侧的NOx浓度测量值与催化剂下游侧的NOx浓度测量值进行修正,根据这些NOx浓度修正值求出NOx降低率。
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JP215767/2004 | 2004-07-23 | ||
JP2004215767A JP4267535B2 (ja) | 2004-07-23 | 2004-07-23 | 排気浄化装置のNOx低減率測定方法 |
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US (1) | US7543443B2 (zh) |
EP (1) | EP1801376B1 (zh) |
JP (1) | JP4267535B2 (zh) |
KR (1) | KR20070032780A (zh) |
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DE112006001805A5 (de) * | 2005-07-19 | 2008-06-26 | Avl List Gmbh | Abgasstrang einer Brennkraftmaschine |
DE102005042488A1 (de) * | 2005-09-07 | 2007-03-08 | Robert Bosch Gmbh | Verfahren zum Betreiben einer Brennkraftmaschine und Vorrichtung zur Durchführung des Verfahrens |
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KR100957138B1 (ko) * | 2007-07-09 | 2010-05-11 | 현대자동차주식회사 | 질소산화물 센서 고장 판단 방법 및 이를 수행하는 선택적환원 촉매 시스템 |
JP2010071192A (ja) * | 2008-09-18 | 2010-04-02 | Toyota Motor Corp | 排気ガス浄化装置 |
DE102008047860B3 (de) * | 2008-09-18 | 2009-12-24 | Continental Automotive Gmbh | Verfahren zur Dichtheitsprüfung eines Reagenzmittelinjektors |
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- 2004-07-23 JP JP2004215767A patent/JP4267535B2/ja not_active Expired - Fee Related
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2005
- 2005-07-21 KR KR1020077000774A patent/KR20070032780A/ko not_active Application Discontinuation
- 2005-07-21 EP EP05766446A patent/EP1801376B1/en not_active Expired - Fee Related
- 2005-07-21 DE DE602005018088T patent/DE602005018088D1/de active Active
- 2005-07-21 US US11/632,998 patent/US7543443B2/en not_active Expired - Fee Related
- 2005-07-21 WO PCT/JP2005/013365 patent/WO2006009196A1/ja active Application Filing
- 2005-07-21 CN CNA200580024641XA patent/CN1989321A/zh active Pending
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CN105317512A (zh) * | 2014-07-28 | 2016-02-10 | 通用汽车环球科技运作有限责任公司 | 生成用于氮氧化合物传感器偏移的防反跳持续时间的排气处理*** |
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CN109154246B (zh) * | 2016-05-24 | 2021-06-01 | 德尔福汽车***卢森堡有限公司 | 在发动机***中提供模型的方法 |
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Also Published As
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JP4267535B2 (ja) | 2009-05-27 |
EP1801376A1 (en) | 2007-06-27 |
DE602005018088D1 (de) | 2010-01-14 |
JP2006037771A (ja) | 2006-02-09 |
EP1801376B1 (en) | 2009-12-02 |
US20070199307A1 (en) | 2007-08-30 |
EP1801376A4 (en) | 2008-01-16 |
WO2006009196A1 (ja) | 2006-01-26 |
US7543443B2 (en) | 2009-06-09 |
KR20070032780A (ko) | 2007-03-22 |
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