Method and system for improving exhaust system efficiency
US11073095B2 · kind B2 · utility
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21Claims
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Key dates
| Filing date | Sep 9, 2019 |
| Grant date | Jul 27, 2021 |
| Priority date | — |
| Expiry date | Sep 24, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Methods and systems are provided for improving efficiency of an exhaust gas after treatment system of a vehicle. In one example, a first group of engine cylinders is operated with a rich air-fuel ratio continuously while a second group of engine cylinders is operated with a lean air-fuel ratio continuously. The rich and lean exhaust gases from the two groups of engine cylinders may be oxidized within an exhaust gas after treatment system to improve catalyst efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.