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Method and system for shape-memory alloy wire control

  • US 8,852,164 B2
  • Filed: 01/21/2011
  • Issued: 10/07/2014
  • Est. Priority Date: 02/09/2006
  • Status: Active Grant
First Claim
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1. A method for controlling a device using a shape-memory alloy wire comprising:

  • a controller determining an ontime for the shape-memory alloy wire in the device based on a target volume to be pumped by a pump plunger in the device;

    the controller determining a temperature of the shape-memory alloy wire;

    the controller adjusting the ontime for the shape-memory alloy wire based on the temperature of the shape-memory alloy wire;

    actuating the shape-memory alloy wire to effectuate the pumping of a volume of fluid by the pump plunger from a reservoir to a volume sensor chamber;

    measuring the volume of fluid pumped using a volume sensor assembly;

    determining the difference between the target volume and the volume of fluid pumped; and

    if the volume of fluid pumped is greater than or less than the target volume, updating the ontime.

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