| 发明名称 | Method and system for estimating reagent quality | ||
| 摘要 | In a method for estimating the quality of an urea based reagent in terms of urea concentration, the reagent is injected upstream of a SCR catalyst in an exhaust aftertreatment system. A demanded NOx conversion rate is set substantially lower than a currently estimated maximum NOx conversion rate of the SCR catalyst. An actual NOx conversion rate is monitored for a certain time period. The urea concentration of the reagent is estimated based on comparing the monitored actual NOx conversion and the demanded NOx conversion during the time period. A corresponding system is also disclosed. | ||
| 申请公布号 | US9327240(B2) | 申请公布日期 | 2016.05.03 |
| 申请号 | US201214417798 | 申请日期 | 2012.08.31 |
| 申请人 | Volvo Truck Corporation | 发明人 | Blanckenfiell Magnus;Källen Per-Olof |
| 分类号 | G01N15/06;G01N33/00;G01N33/48;F01N3/20;F01N3/00;B01D53/94;F01N11/00 | 主分类号 | G01N15/06 |
| 代理机构 | WRB-IP LLP | 代理人 | WRB-IP LLP |
| 主权项 | 1. Method for estimating the quality of an urea based reagent in terms of urea concentration, the reagent being injected upstream of a SCR catalyst in an exhaust aftertreatment system, comprising: setting a demanded NOx conversion rate substantially lower than a currently estimated maximum NOx conversion rate of the SCR catalyst, wherein a degraded and aged SCR catalyst exhibits essentially the same NOx conversion rate as a new SCR catalyst at the demanded NOx conversion rate; monitoring an actual NOx conversion rate for a certain time period; and estimating the urea concentration of the reagent based on comparing the monitored actual NOx conversion and the demanded NOx conversion during the time period. | ||
| 地址 | Göteborg SE | ||