Importance

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Abstract

Set forth herein are apparatus and systems that compensate for component dimensional changes in fluid control applications, particularly piezoelectric fuel injectors. Specifically, the present invention combines several functions to actuate an inward opening fuel injector with a piezoelectric stack. The arrangement can counteract expansion, amplify motion, compensate for dimensional variations, and/or compensate for fuel pressure variations. Some embodiments can reverse the expansion of the piezoelectric stack by converting it into a pulling force. Other embodiments can amplify and/or reduce component motion within the fuel injector to a desired motion ratio. The device can also compensate for dimensional variations of fuel injector components, such as thermal expansion, manufacturing tolerances, and/or component wear and alter the injector pin closing force based on the amount of fuel pressure.

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First Claim