Exhaust purification system of internal combustion engine
US8656706B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 2010 |
| Grant date | Feb 25, 2014 |
| Priority date | — |
| Expiry date | Sep 2, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. On the exhaust purification catalyst (13), platinum Pt (51) is carried and a basic layer (53) is formed. At the time of engine operation, a main concentration changing action in which the concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to change by a predetermined amplitude (ΔHA) and predetermined period (ΔTA) is performed. Furthermore, before each main concentration changing action, an auxiliary concentration changing action in which the concentration of hydrocarbons is made to change by an amplitude (ΔHB) smaller than the amplitude (ΔHA) at the time of each main concentration changing action is performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.