Air-fuel ratio control apparatus of internal combustion engine and method thereof
US6854262B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2003 |
| Grant date | Feb 15, 2005 |
| Priority date | — |
| Expiry date | Sep 22, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The present invention has an object to provide an air-fuel ratio control apparatus of an internal combustion engine and a method thereof, for estimating with high accuracy an oxygen adsorption amount in an exhaust purification catalyst, and controlling the oxygen adsorption amount in the exhaust purification catalyst at an optimum amount, thereby enabling to maintain high exhaust purification efficiency. To this end, in the present invention, there is stored a catalyst model that receives an oxygen amount which is not used for the oxidization/reduction in an exhaust purification catalyst disposed on an exhaust passage of an engine, and outputs an oxygen concentration in an exhaust gas downstream of the exhaust purification catalyst, the oxygen amount which is not used for the oxidization/reduction in the exhaust purification catalyst is calculated based on the oxygen concentration in the exhaust gas upstream of the exhaust purification catalyst and an engine intake air amount, parameters of the catalyst model are sequentially estimated based on the calculated oxygen amount and the oxygen concentration in the exhaust gas downstream of the exhaust purification catalyst, an oxygen ads…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.