Fuel controller
US6782695B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2002 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Oct 14, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a method and apparatus for controlling the air-fuel ratio demanded by a fuel controller in order to maintain optimum performance of a catalytic converter. The invention provides a controller for requesting an air fuel ratio according to a switching value derived from an estimated oxygen storage value of a catalyst, in which the controller is arranged to perform the following stepsa) request a maximum ratio of air to fuel when the switching value is less than a first threshold;b) gradually decrease the requested air to fuel ratio from said maximum ratio;c) request a minimum ratio of air to fuel when the switching value is greater than a second threshold; andd) gradually increase the requested air to fuel ratio from said minimum ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.