Method for identifying a blockage of a dosing valve of an SCR catalytic converter system
US9062807B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2013 |
| Grant date | Jun 23, 2015 |
| Priority date | — |
| Expiry date | Mar 7, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0318
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The invention relates to a method for identifying a blockage of one or more spray openings of a dosing valve of an SCR catalytic converter system. Said method comprises the closure of the dosing valve, the determination of a first pressure profile in the hydraulic system in the delivery module of the SCR catalytic converter system, and the determination of the stiffness of the hydraulic system from the first pressure profile. The dosing valve is subsequently opened, a second pressure profile in the hydraulic system in the delivery module of the SCR catalytic converter system is determined, and a blockage of one or more spray openings of the dosing valve is determined from the stiffness and from the second pressure profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.