Method and system of controlling oxygen purge of three-way catalyst
US10968798B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | Nov 13, 2019 |
| Grant date | Apr 6, 2021 |
| Priority date | — |
| Expiry date | Nov 13, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of controlling an oxygen purge of a three-way catalyst (TWC) may include: rapidly adjusting, by a controller, an air-fuel ratio (AFR) at an upstream of the TWC to a target AFR when the oxygen purge of the TWC after a fuel cut-off is performed; and maintaining the target AFR until an oxygen purge finish time has passed. According to the method, concentration of NOx slipped from the TWC after the oxygen purge may be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.