Exhaust gas purification apparatus and method for internal combustion engine
US10029210B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 25, 2013 |
| Grant date | Jul 24, 2018 |
| Priority date | — |
| Expiry date | Oct 25, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In embodiments, an exhaust gas purification apparatus and method for an internal combustion engine initializes a SCR catalyst by heating the SCR catalyst under predetermined conditions without accompanying troublesome procedures and complicated calculations. With the exhaust gas purification apparatus for an internal combustion engine, arranged on an exhaust-gas passage of the internal combustion engine and including the SCR catalyst for purifying NOx in exhaust gas in the internal combustion engine, the method calculates and accumulates estimated values of NH3 adsorption adsorbed on the SCR catalyst, on the basis of the amount of NH3 injection from urea-aqueous solution injected into the exhaust-gas passage from the upstream side of the SCR catalyst and the amount of NH3 injection for purifying NOx at the upstream side of the SCR catalyst, and initializing the SCR catalyst by heating the SCR catalyst to initialize the estimated value of NH3 adsorption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.