Method and apparatus for control of a shape memory alloy actuato

Details Method and apparatus for control of a shape memory alloy actuato Method and apparatus for control of a shape memory alloy actuato

1998-09-28

1999-11-16

Hepperle, Stephen M.

Valves and valve actuation

Heat or buoyancy motor actuated

25112906, 137339, F16K 3102

Patent

active

059842580

ABSTRACT:
A shape memory alloy actuator assembly for a fuel injector, wherein the response times of the shape memory alloy element is decreased to less than about 1 millisecond by forced, convective heat transfer from the SMA element or elements. The forced, convective heat transfer is provided by the circulation of fluid across the SMA element by a metering orifice plate, which directs a fluid flow across the SMA element so as to maximize the area of contact between the fuel and the SMA element, regardless of whether the fuel injection valve is opened or closed. Use of forced convective heat transfer in accordance with the present invention allows greater power input levels than previously possible without resulting in an over-temperature condition of the SMA alloy, as well as constant response times.

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