Engine exhaust purification device
US6490859B2 · kind B2 · utility
2Cited by
10References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Feb 23, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An oxygen storage amount of the catalyst (3) is estimated using a detection result from a front A/F sensor (4). An HC storage amount is calculated as a time integral of the product of the storage rate by the catalyst (3), the air-fuel ratio and the intake air amount, and a target air-fuel ratio is corrected so that a deficiency relative to a target amount of the oxygen storage amount is compensated based on this computation result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.