Method for detecting a blocked pressure line
US10900401B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2017 |
| Grant date | Jan 26, 2021 |
| Priority date | — |
| Expiry date | Dec 30, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method of detecting a blocked pressure line in an internal combustion engine SCR system, which includes a feed pump, a dosing module, a pressure sensor, and an electronic control unit, includes a reference signal of a pressure (p) in the pressure line being measured over a measuring time (tM) if a reducing agent solution is not dosed by the dosing module, and a signal energy of the reference signal is then calculated; a pressure signal being measured over the measuring time (tM) during the dosing of a dosing mass of the reducing agent solution by the dosing module; and a signal energy of the pressure signal is then calculated; a ratio of the signal energies of the pressure signal to the signal energy of the reference signal being calculated; and finally the blocked pressure line being detected if the ratio falls short of a first pre-definable threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.