![SCR排气后处理系统的运行方法及诊断方法](/CN/2008/8/20/images/200880104697.jpg)
基本信息:
- 专利标题: SCR排气后处理系统的运行方法及诊断方法
- 专利标题(英):Operating and diagnostic method for an scr exhaust-gas aftertreatment system
- 申请号:CN200880104697.X 申请日:2008-08-13
- 公开(公告)号:CN101790623B 公开(公告)日:2012-01-18
- 发明人: M-R·布施 , D·何布斯特里特 , U·霍夫曼
- 申请人: 戴姆勒股份公司
- 申请人地址: 德国斯图加特
- 专利权人: 戴姆勒股份公司
- 当前专利权人: 梅赛德斯-奔驰集团股份公司
- 当前专利权人地址: 德国斯图加特
- 代理机构: 北京市中咨律师事务所
- 代理人: 吴鹏; 张亚非
- 优先权: 102007040439.7 2007.08.28 DE
- 国际申请: PCT/EP2008/006640 2008.08.13
- 国际公布: WO2009/030346 DE 2009.03.12
- 进入国家日期: 2010-02-26
- 主分类号: F01N9/00
- IPC分类号: F01N9/00 ; F01N11/00 ; F01N3/20
The invention relates to an operating and diagnostic method for an SCR exhaust-gas aftertreatment system, which has an SCR catalytic converter (5) with ammonia storage capacity, of an internal combustion engine (1). In the method, a signal (S) of an exhaust-gas sensor (25) which is sensitive to nitrogen oxide and ammonia and which is arranged downstream of the SCR catalytic converter (5) is measured. According to the invention, in a normal operating mode, ammonia is supplied to the SCR catalytic converter (5) corresponding to a filling level model for ammonia stored in the SCR catalytic converter (5), in such a way that the ammonia filling level (F) of the SCR catalytic converter (5) is held at least approximately at a predefinable nominal value or in a predefinable nominal value range. The normal operating mode is interrupted if a signal, which exceeds a predefinable first limit value (G1), of the exhaust-gas sensor (25) is registered, and the set urea dosing rate is increased by a predefinable degree in relation to the value provided in the normal operating mode. Thereafter, a return is made to the normal operating mode, or a switch is made to a diagnostic operating mode, as a function of the profile of the signal (S) of the exhaust-gas sensor (25).
公开/授权文献:
- CN101790623A SCR排气后处理系统的运行方法及诊断方法 公开/授权日:2010-07-28
IPC结构图谱:
F | 机械工程;照明;加热;武器;爆破 |
--F01 | 一般机器或发动机;一般的发动机装置;蒸汽机 |
----F01N | 一般机器或发动机的气流消音器或排气装置;内燃机的气流消音器或排气装置 |
------F01N9/00 | 排气处理装置的电控 |