Method and apparatus for controlling air-fuel ratio in internal combustion engine
US4627402A · kind A · utility
13Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1985 |
| Grant date | Dec 9, 1986 |
| Priority date | — |
| Expiry date | Nov 13, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/2451
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an internal combustion engine having a plurality of cylinders, an air-fuel ratio signal is sampled and held for a selected cylinder, and an air-fuel ratio feedback amount is calculated in accordance with the sampled and held air-fuel ratio signal. During a learning control, a cylinder on the leanest side is determined by changing the selected cylinder. During a feedback control without the learning control, the selected cylinder is fixed as the cylinder on the leanest side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.