Fuel injector having piezoelectric actuator with preload control element and method

Fuel injector having piezoelectric actuator with preload control element and method

A fuel injector includes a piezoelectric actuator subassembly having a casing and a piezoelectric element disposed within the casing. The piezoelectric element has an operating temperature range and includes a thermally contractive material having a negative thermal expansion coefficient over a seco...

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Hauptverfasser: Hess, Amy M, Ibrahim, Daniel R, Lewis, Stephen R, Venkataraghavan, Jayaraman, Lakhapati, Shriprasad
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Sprache:eng
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creator Hess, Amy M
Ibrahim, Daniel R
Lewis, Stephen R
Venkataraghavan, Jayaraman
Lakhapati, Shriprasad
description A fuel injector includes a piezoelectric actuator subassembly having a casing and a piezoelectric element disposed within the casing. The piezoelectric element has an operating temperature range and includes a thermally contractive material having a negative thermal expansion coefficient over a second temperature range overlapping with the operating temperature range. A preload control element is coupled with the piezoelectric element and includes a thermally expansive material having a positive thermal expansion coefficient over the second temperature range. The preload control element maintains a constant preload on the piezoelectric element over a wide temperature range to inhibit temperature induced variability in operation, and can axially lengthen in opposition to axial shortening of the piezoelectric element, responsive to a temperature increase.
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title Fuel injector having piezoelectric actuator with preload control element and method
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