Method and device for activating a valve of a fuel vapor...

Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system

Reexamination Certificate

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Details

C701S114000, C361S153000

Reexamination Certificate

active

07441550

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.

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Van Basshuysen/Schäfer; “Handbuch Verbrennungsmotor”; Grundlagen, Komponenten, Systeme, Perspektiven; Siemens VDO Automotive; 2002; pp. 604-607; Vieweg Verlag.

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