Apparatus for driving piezoelectric element for closing and opening valve member.

摘要

In an apparatus for driving a piezoelectric element (117) to close and open a valve member (103) by expanding and contracting a volume of a pressure chamber (113), at an initial stage of a closing state of the valve member, a higher voltage than a conventional charging voltage or a lower voltage than a conventional discharging voltage is applied to the piezoelectric element, to thus create an initial large closing force at the valve member.