System, Method, and Apparatus for Estimating Liquid Delivery

A pump, comprising:

• an acoustic housing;
• an additional acoustic housing
• a reservoir configured to deliver a liquid, wherein the reservoir is disposed within the acoustic housing;
• a port coupled to the reservoir and configured to discharge the liquid;
• a plunger having a piston coupled to a shaft, wherein the plunger is disposed within the acoustic housing, 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;
• an additional reservoir configured to deliver an additional liquid, wherein the additional reservoir is disposed within the additional acoustic housing;
• an additional port coupled to the additional reservoir and configured to discharge the additional liquid;
• an additional plunger having an additional piston coupled to the additional shaft, wherein the additional plunger is disposed within the additional acoustic housing, wherein the additional piston is disposed within the additional reservoir in sliding engagement with an inner surface of the additional reservoir, wherein the additional piston defines a liquid side of the additional reservoir and a non-liquid side of the additional reservoir whereby movement of the additional plunger towards the liquid side of the additional reservoir discharges liquid through the additional port;
• and
• a reference-volume assembly coupled to the acoustic housing through an acoustic port, wherein the reference-volume assembly is coupled to the additional acoustic housing through an additional acoustic port, wherein the reference-volume assembly comprises:
• a reference-volume chamber in acoustic communication with the acoustic housing via the acoustic port, wherein the reference-volume chamber is in acoustic communication with the additional acoustic housing via the additional acoustic port;
• a speaker disposed within the reference-volume chamber;
• and
• a reference microphone disposed within the reference-volume chamber.