Patent · US Active

Method and device for activating a valve of a fuel vapor retention system

US7441550B2 · kind B2 · utility

4Cited by

18References

14Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Wolfgang Ludwig · Destin, US
Wolfgang Mai · Kronberg, DE
Jens Pache · Kelkheim, DE

Key dates

Filing date	Jan 19, 2007
Grant date	Oct 28, 2008
Priority date	—
Expiry date	Apr 28, 2027

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02D2041/2055
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

For the purposes of a determination of a fuel vapor loading level of a fuel vapor retention system of a combustion engine, an opening level of a valve of the fuel vapor retention system is increased in steps or continuously during a determination phase. Furthermore, the valve is activated at most a predefined first period prior to a start of the determination phase by a conditioning pulse at least whenever the valve was closed previously for a second period that is longer than a predefined threshold value. The conditioning pulse is generated in such a way that the valve definitely opens at most for a predefined opening period and then closes again.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.