Apparatus for driving a piezoelectric actuator

Details Apparatus for driving a piezoelectric actuator Apparatus for driving a piezoelectric actuator

H - Electricity

01

L

H01L 41/04 (2006.01) F02D 41/20 (2006.01)

Patent

CA 2063382

2063382 9117351 PCTABS00008 An apparatus (200) is provided for controllably connecting and disconnecting a piezoelectric actuator (205) to and from an energy source (210) to effect the displacement of a piezoelectric actuator (205) for a fuel injector. Precise control of the timing and duration of the piezoelectric actuator (205) 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 (235, 240) monitors the voltage level of the piezoelectric actuator (205), and the charging and discharging current of the piezoelectric actuator (205). Further, a smoothing means (245) aids in levelling the charging and discharging current to better approximate a constant current to control the piezoelectric actuator (205) providing a precise quantity of fuel to be delivered.

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