Deterioration determination system of exhaust emission control device
US9366168B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2013 |
| Grant date | Jun 14, 2016 |
| Priority date | — |
| Expiry date | Oct 29, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An object of the present invention is to increase the accuracy of a deterioration determination in a deterioration determination system of an exhaust emission control device having a selective reduction type NOx catalyst, by suppressing false determinations when the deterioration determination is made. The deterioration determination system includes a catalyst having an oxidative capacity downstream of a NOx catalyst using ammonia as a reducing agent. When an amount of ammonia adsorbed by the NOx catalyst is larger than an equilibrium adsorption amount, out of the amount of ammonia flowing into the catalyst having the oxidative capacity, at least one of the amount of ammonia flowing out from the catalyst having the oxidative capacity and the amount of ammonia converted to NOx in the catalyst having the oxidative capacity or a total value of both is calculated. When the value exceeds a threshold, the use of a detection value of an NOx sensor is limited in a deterioration determination or the deterioration determination itself is prohibited.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.