Engine exhaust purification device
US6499290B1 · kind B1 · utility
4Cited by
10References
90Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2001 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Feb 19, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A controller (6) controls an air-fuel ratio of an engine (1) so that an oxygen storage amount of a catalyst (3) provided in an exhaust passage (2) is maintained constant. At this time, the controller (6) computes or estimates the oxygen storage amount separately for a first amount and a second amount, where the first amount is estimated based on a relationship between the first and second amount. The controller (6) controls the air/fuel ratio based on the estimated first amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.