Apparatus for controlling air/fuel ratio for internal combustion engine
US4598684A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1985 |
| Grant date | Jul 8, 1986 |
| Priority date | — |
| Expiry date | Jun 20, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an internal combustion engine equipped with exhaust gas recirculation system, air/fuel ratio control is effected using various engine parameters including atmospheric pressure. To this end, basic fuel injection duration is first computed, and this basic fuel injection duration is corrected using a correction factor so that a desired air/fuel ratio is obtained irrespective of the change in atmospheric pressure. When EGR is performed a first correction factor is derived or calculated using engine speed data, intake pressure data and atmospheric pressure data. When EGR is not performed, a second correction factor is derived or calculated using atmospheric pressure data. When obtaining the first correction factor, interpolation is used to obtain the value thereof suitable for detected engine speed, intake pressure and atmospheric pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.