Method for operating a delivery device for a reducing agent and motor vehicle having a delivery device
US8820053B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2012 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | Feb 26, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/1804
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for operating a reducing agent delivery device having a liquid reducing agent tank, an injector dispensing reducing agent into an exhaust treatment device, an internal combustion engine and a reducing agent line from tank to injector, includes conveying the reducing agent from tank to injector with a pump and providing a pressure sensor in the line. The method includes, repeatedly: determining and providing supply pressure for the injector in the delivery device with the pump, calculating an injector opening time from a determined injection volume and supply pressure and opening the injector at the calculated injector opening time. A venting procedure at a point in time includes: determining an increase of a pressure conveying volume characteristic in the delivery device, calculating an air bubble volume by comparing the increase to a target increase, and conveying a conveying volume through the injector. A motor vehicle is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.