Device for controlling a piezoelement injection valve
AssigneeDaimlerChrysler AG
InventorsRolf Klenk, Klaus Rössler, Alexander Stefani, Guido Vent
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Abstract
In a device for controlling an injection valve which can be operated by a piezo-actuator and which comprises a charging and discharging circuit for the controlled charging of the piezo-actuator to a certain piezo-voltage, the charging and discharging circuit includes a power supply with a multitude of voltage levels which correspond to various valve opening positions and a switching device for the controlled switch-over between the plurality of voltage levels.
Claims4
A device for controlling an injection valve, which can be activated by means of a piezo-actuator, in particular for a spark ignition engine with internal air/fuel mixture formation, having
- charging and discharging means for the controlled charging and discharging of said piezo-actuator to a desired charging and, respectively, discharging piezo-voltage,
- said charging and discharging means including a voltage supply with a time-controlled switching means providing an initial charging voltage level and an initial discharging voltage level, said initial charging voltage level being higher than the desired charging piezo-voltage and the initial discharging voltage level being lower than the desired discharging piezo-voltage level, and time-controlled switching means for a rapid time-controlled establishment of the desired piezo-voltage in the piezo-actuator.
Dependencies are inferred from the claim text.