Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-12-14
1992-07-14
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, 310319, H01L 4108
Patent
active
051305984
ABSTRACT:
An apparatus is provided for controllably connecting and disconnecting a piezoelectric actuator to and from an energy source to effect the displacement of a piezoelectric actuator for a fuel injector. Precise control of the timing and duration of the piezoelectric actuator is necessary to ensure that a proper quantity of fuel is delivered to each cylinder of an internal combustion engine. A charging and discharging means monitors the voltage level of the piezoelectric actuator, and the charging and discharging current of the piezoelectric actuator. Further, a smoothing means aids in leveling the charging and discharging current to better approximate a constant current to control the piezoelectric actuator providing a precise quantity of fuel to be delivered.
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Antone James A.
Grajales Liliana
Verheyen Michael R.
Budd Mark O.
Caterpillar Inc.
Dougherty Thomas M.
Masterson David M.
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