Feedback air fuel ratio control system and method
US4483300A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1982 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Jan 18, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/008
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A feedback air fuel ratio control system or method for a multi-cylinder engine is arranged not only to control the average value of the air fuel ratios among the cylinders but also to control the individual air fuel ratio of the individual cylinders so as to level the cylinder to cylinder air fuel distribution. This is done, for example, by directly detecting which cylinder is a source of the air fuel deviation by examining the oxygen sensor signal fluctuation in relation of time and individually regulating a fuel injector for that cylinder. In the case of an engine with a carburetor, the carburetor is controlled in relation with time in accordance with the sequence of the intake periods of the individual cylinders to control the individual air fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.