Air-fuel ratio control system for internal combustion engine and control method therof
US6502389B2 · kind B2 · utility
59Cited by
6References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2001 |
| Grant date | Jan 7, 2003 |
| Priority date | — |
| Expiry date | Dec 26, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/0814
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air-fuel ratio control system for an internal combustion engine estimates an oxygen storage amount of a catalyst based on a record of an oxygen storage amount, and controls an air-fuel ratio based on the estimated oxygen storage amount. The catalyst is divided into multiple sections in a flow direction of an exhaust gas, the oxygen storage amount in a specified section is estimated according to a behavior of an exhaust gas on upstream and downstream sides of the respective specified sections, and the air-fuel ratio is controlled based on the estimated oxygen storage amount in the specified section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.