Systems and methods for operating an engine including a secondary air system
US11591947B1 · kind B1 · utility
1Cited by
2References
20Claims
0Family size
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Key dates
| Filing date | Feb 4, 2022 |
| Grant date | Feb 28, 2023 |
| Priority date | — |
| Expiry date | Feb 4, 2042 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N2560/025
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for monitoring a secondary airflow (SAIR) system in an engine includes determining degradation of the SAIR system adding a SAIR to downstream of an engine cylinder exhaust based on a comparison of the SAIR before and after a shutdown of a SAIR pump, the SAIR calculated from a fuel injection amount, an exhaust air-fuel ratio, and an engine intake airflow. In this way, SAIR at the exhaust manifold can be monitored utilizing existing onboard sensors and technology, thereby maintaining OBD and emissions monitoring, reducing engine emissions, and maintaining costs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.