Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2007-11-27
2007-11-27
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S317000
Reexamination Certificate
active
11206462
ABSTRACT:
A piezoelectric actuator, for instance a piezoelement for driving an injection valve of an internal combustion engine, is discharged from a charge state, in which a first control potential is present on a first piezo-terminal and a second control potential is present on a second piezo-terminal. The discharging operation is accelerated by not only changing the potential prevailing on the first piezo-terminal toward the second control potential by way of a first discharge path, but a second discharge path is also formed between the second piezo-terminal and a potential lying between the two control potentials. By appropriate selection of the time sequence in connecting these two discharge paths and of their electrical properties, discontinuities in the discharge process can be almost completely avoided. The discharge process then proceeds very rapidly and evenly.
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