Method for detecting urea consumption deviation, and vehicle post-processing system
US12104510B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2019 |
| Grant date | Oct 1, 2024 |
| Priority date | — |
| Expiry date | Jun 16, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for detecting a urea consumption deviation including: calculating a pump pressure correction factor fac; calculating a urea consumption deviation factor A when the pump pressure correction factor fac is within a calibrated range; calculating the urea consumption deviation factor A multiple times, and calculating an average value of A; and comparing the average value of the urea consumption deviation factor A with a calibrated limiting value range, so as to determine whether there is a great deviation between an actual urea consumption value and a theoretical urea consumption value, the calculating the pump pressure correction factor fac comprises: adjusting a pressure of a urea pump to P1; adjusting the pressure of the urea pump to P2, where P2 is smaller than P1; recording a time T1 during which the pressure of the urea pump is adjusted from P1 to P2; and calculating fac=T1/(P1−P2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.