Engine with exhaust emission control device
US10746072B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 2018 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | Oct 12, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An engine includes: an NOx catalyst and an SCR catalyst in an exhaust passage; an excess air ratio change device that changes an excess air ratio of an exhaust gas; and a reducing agent supply device that supplies a reducing agent for SCR including a material for NH3 or NH3 to a portion between the NOx catalyst and the SCR catalyst in the exhaust passages. The engine controls the reducing agent supply device in such a manner that a quantity of the reducing agent for SCR to be supplied from the reducing agent supply device to the exhaust passage 40 becomes small when the excess air ratio of the exhaust gas during regeneration control to regenerate the NOx catalyst is small, as compared to when the excess air ratio λ of the exhaust gas during regeneration control to regenerate the NOx catalyst is large.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.