Internal combustion engine air/fuel ratio regulation
US5392598A · kind A · utility
19Cited by
8References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1993 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | Oct 7, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1479
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Internal combustion engine air/fuel ratio regulation in which closed-loop air/fuel ratio control responsive to a pre-converter oxygen sensor feedback signal is further regulated in accord with a feedback signal from a post-converter oxygen sensor signal operative under certain engine operating conditions to provide an average actual engine air/fuel ratio signal. A pre-converter oxygen sensor rich/lean threshold is adjusted in accord with the post-converter signal to drive or maintain such post-converter signal within a preferred range corresponding to an average engine air/fuel ratio of stoichiometry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.