System and method for reducing NOx emissions in an apparatus having a diesel engine
US7204227B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2005 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | Jun 15, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In a mechanical apparatus having a diesel engine including a combustion chamber, an intake valve for passing air into the combustion chamber, and an exhaust valve for passing exhaust from the chamber, the mechanical apparatus also having an aftertreatment device configured to treat emissions from the diesel engine, a method of operating the engine is disclosed, wherein the method includes performing at least one combustion in the combustion chamber with a first quantity of fuel, determining a temperature of the aftertreatment device, and if the temperature of the aftertreatment device is equal to or below a preselected temperature threshold, then performing at least one combustion in the combustion chamber with a second, greater quantity of fuel and varying at least one of an intake valve timing and an exhaust valve timing relative to a default valve timing to cause at least one of a compression loss and a pumping loss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.