Exhaust purification system for internal combustion engine
US9057298B2 · kind B2 · utility
0Cited by
6References
16Claims
0Family size
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Key dates
| Filing date | Jun 29, 2012 |
| Grant date | Jun 16, 2015 |
| Priority date | — |
| Expiry date | Jun 29, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N3/085
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A wall flow type particulate filter is arranged inside the exhaust passage of an internal combustion engine where combustion is performed under an excess of oxygen. The particulate filter carries a solid acid. The solid acid has a Hammett acidity function smaller than −0.83 and larger than −12 in the standard state. To remove the ash from the particulate filter, ash atomization processing for rendering the state of the particulate filter a state where the exhaust gas which flows into the particulate filter is lowered in concentration of oxygen and the particulate filter is raised in temperature is temporarily performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.