LNT regeneration strategy over normal truck driving cycle
US7685813B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 2005 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Sep 1, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Partial denitrations are made practical by an SCR catalyst placed downstream of a NOx adsorber. The SCR catalyst permits partial denitrations to be extended to where a favorable fuel penalty rate presented by driving conditions can be utilized to a sufficient extent that the benefit of the favorable conditions is not offset by the increased start-up fuel penalty associated with conducting opportunistic partial denitrations. Regenerations, including both denitration and desulfations, can be initiated selectively based on a fuel penalty calculation. Examples of such calculations lead to methods in which opportunistic regenerations are based on low oxygen concentrations, condition existing while shifting gears, and throttling events for a diesel engine with a throttled air supply. The methods flexibly take advantage of driving conditions to reduce fuel penalties associated with regenerations. In one embodiment, driving conditions include future conditions predicted based on GPS and map data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.