Method for sparking engine cylinders after fuel shutdown for reduced emissions
US6318334A · kind A · utility
6Cited by
10References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2000 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Mar 1, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/062
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for reducing hydrocarbon emissions in an engine of a vehicle. The methodology is triggered following the switching off of the ignition by the operator. First, fuel delivery to the engine is terminated. Second, spark ignition is continued based on a predetermined parameter such as time or engine cycles following the termination of the fuel delivery. Last, spark ignition is stopped. Since combustion continues until no fuel exists in the cylinder, there is no over abundance of fuel in the catalyst at a subsequent start up. As such, the catalyst operates effectively at start up and hydrocarbon emissions are lowered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.