Air-fuel ratio control apparatus for internal combustion engines
US6311482A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 7, 2000 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Jul 7, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S903/903
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air-fuel ratio control apparatus for internal combustion engine includes exhaust gas purifying catalysts mounted on the upstream and downstream sides of an exhaust passage of an internal combustion engine, a fuel injector for injection of a desired quantity of fuel into a cylinder of the internal combustion engine in accordance with an engine operating condition, and an ECU. The ECU changes an air-fuel ratio to lean and rich magnitudes by alternately increasing and decreasing the quantity of fuel injection. The lean/rich changeover of the exhaust air-fuel ratio is performed at an interval including a period during which the lean and rich components in the exhaust gas react with the upstream catalyst and a period thereafter during which an unreacted exhaust gas passes through the upstream catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.