Air/fuel ratio control method having fail-safe function for abnormalities in oxygen concentration detecting means for internal combustion engines
US4542729A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1983 |
| Grant date | Sep 24, 1985 |
| Priority date | — |
| Expiry date | May 27, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B1/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air/fuel ratio control method in which the air/fuel ratio of an air/fuel mixture being supplied to an internal combustion engine is controlled to required values by the use of a first coefficient which has a value variable with a change in the output of the oxygen concentration detecting means, during feedback mode control, and by the use of a second coefficient which is a mean value of values of the first coefficient applied during the above feedback mode control, during operation of the engine in a mode other than the feedback mode control. When the above second coefficient has a value falling outside a predetermined range of values, the value of the same coefficient is set to a predetermined value. Preferably, the above predetermined value of the second coefficient is set at a constant value of 1.0 or a constant value adapted to obtain a required quantity of the air/fuel ratio of an air/fuel mixture to the engine in dependence upon the operating characteristics of the engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.