Method and device for metering a fluid
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United States of America Patent
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-
Jan 3, 2012
Grant Date -
Mar 26, 2009
app pub date -
Sep 22, 2008
filing date -
Sep 24, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
An injection valve has a magnetic actuator and an injector needle able to be moved axially by the magnetic actuator. To meter a fluid by the injection valve the magnetic actuator is activated for an individual metering process with at least one actuation signal with a first or second signal waveform. The two actuation signals differ from one another in that, on activation of the magnetic actuator by the actuation signal with the first signal waveform, less energy is transmitted to a magnet unit of the magnetic actuator than during activation of the magnetic actuator by the actuation signal with the second signal waveform. The magnetic actuator is activated by the actuation signal with the second signal waveform if an activation of the magnetic actuator by the actuation signal with the first signal waveform leads to an undesired premature closure of the injector needle.
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