Air-fuel ratio control apparatus and method for an internal combustion engine
US7597091B2 · kind B2 · utility
7Cited by
9References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2008 |
| Grant date | Oct 6, 2009 |
| Priority date | — |
| Expiry date | Jun 13, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/147
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
When an internal combustion engine including a plurality of cylinders is operating steadily, an index value relating to an actual hydrogen content in exhaust gas downstream of a portion where exhaust passages from the cylinders merge, and upstream of a catalyst is detected. When an index value relating to the actual hydrogen content in the exhaust gas is larger than a determination index value relating to a hydrogen content corresponding to a permissible limit of air-fuel ratio variation, it is determined that there is abnormal air-fuel ratio variation between the cylinders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.