Method and apparatus for controlling the air-fuel ratio in an internal combustion engine
US4562818A · kind A · utility
26Cited by
8References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1984 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | Jul 3, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/1015
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an internal combustion engine, a standard deviation of combustion variations generated for every firing stroke of at least one cylinder is calculated. The misfire limit of the engine is detected by determining whether or not the calculated standard deviation is greater than a reference value. When the calculated standard deviation is greater than the reference value, the controlled air-fuel ratio is decreased, while when the calculated standard deviation is not greater than the reference value, the controlled air-fuel ratio is increased, thereby attaining a lean burn system without a lean mixture sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.