Method for controlling the air-fuel ratio of an internal combustion engine
US4445481A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1981 |
| Grant date | May 1, 1984 |
| Priority date | — |
| Expiry date | Dec 22, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/2441
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Engine parameter signals indicative of the operating condition of the engine and an air-fuel ratio signal indicative of whether the air-fuel ratio condition of the engine is on the rich side or the lean side relative to a stoichiometric condition are produced. When the engine operates under a predetermined state, the fuel feeding rate to the engine is controlled in response to the engine parameter signals and the air-fuel ratio signal, by a closed loop control operation, in order to determine a learning control correction factor F.sub.G. In the closed loop control operation, a feedback correction factor F.sub.B is calculated depending upon the air-fuel ratio signal, and the fuel feeding rate is corrected depending upon the calculated factor F.sub.B, so as to control the air-fuel ratio condition to a condition close to the stoichiometric condition. At the same time, the learning control correction factor F.sub.G is adjusted, so as to settle the feedback correction factor F.sub.B within a predetermined range while at the same time maintaining the air-fuel ratio condition close to the stoichiometric condition. After the closed loop control operation is completed, the fuel feeding rate…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.