Method and device for activating a valve of a fuel vapor retention system
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United States of America Patent
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Oct 28, 2008
Grant Date -
Jul 19, 2007
app pub date -
Jan 19, 2007
filing date -
Jan 19, 2006
priority date (Note) -
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status (Latency Note)
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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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