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System, method, and apparatus for estimating liquid delivery

  • US 10,220,135 B2
  • Filed: 03/23/2017
  • Issued: 03/05/2019
  • Est. Priority Date: 12/21/2011
  • Status: Active Grant
First Claim
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1. A pump, comprising:

  • a reservoir configured to deliver a liquid;

    a port coupled to the reservoir and configured to discharge the liquid;

    a plunger having a piston coupled to a shaft, wherein the piston is disposed within the reservoir in sliding engagement with an inner surface of the reservoir, wherein the piston defines a liquid side of the reservoir and a non-liquid side of the reservoir whereby movement of the plunger towards the liquid side of the reservoir discharges liquid through the port; and

    a reference-volume assembly coupled to the reservoir, wherein the reference-volume assembly comprises;

    a reference-volume chamber in acoustic communication with the non-liquid side of the reservoir;

    a speaker disposed within the reference-volume chamber; and

    a reference microphone disposed within the reference-volume chamber,wherein the reference-volume assembly further comprises a conduit configured to receive the shaft, wherein the shaft is in sliding engagement with the conduit.

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