Method and arrangement for control of air-fuel ratio of combustion engine
US6467258B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 2000 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Sep 20, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2250/41
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and arrangement for control of a combustion engine (11) having control elements (4, 5, 17) for generation of an air/fuel mixture to each cylinder (3) of the engine (1), an exhaust system (7, 8) which is connected to the engine (1), an exhaust catalyst (10) and a NOx absorbent (11) which are provided in the exhaust system (7, 8), which method comprises: control of the control elements (4, 5, 17) in a first operating condition for generation of a comparatively lean exhaust gas mixture to the NOx adsorbent (11) for adsorption of NOx compounds in the exhaust gas mixture, and control of the control elements (4, 5, 17) in a second operating condition for generation of a comparatively rich exhaust gas mixture to the NOx absorbent (11) for desorption of NOx compounds in the exhaust gas mixture. The invention is characterized in that it comprises: detection of whether at least one condition in the vehicle prevails which corresponds to an initiation of a change-over from the first operating condition to the second operating condition, wherein all adjustment of the air/fuel mixture to the engine (1) is carried out, wherein the generation of a rich exhaust gas mixture is initiated for…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.