Apparatus and method for estimating concentration of vaporized fuel purged into intake air passage of internal combustion engine
US6079397A · kind A · utility
14Cited by
6References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1998 |
| Grant date | Jun 27, 2000 |
| Priority date | — |
| Expiry date | Aug 7, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/0042
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a, so-called, lean burn engine having a vaporized fuel processor, a concentration of a vaporized fuel purged into an intake air passage (so-called, a purge concentration) is estimated using a normal type oxygen concentration sensor. Whenever a predetermined interval of time has passed, the engine combustion condition is forcefully and temporarily transferred into a stoichiometric air-fuel mixture ratio combustion condition during which the purge concentration is estimated on the basis of an output signal from the oxygen concentration sensor during an air-fuel mixture ratio feedback control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.