CPC A61M 16/0051 (2013.01) [A61M 16/0069 (2014.02); A61M 16/026 (2017.08); A61M 16/0875 (2013.01); A61M 16/1075 (2013.01); A61M 16/1095 (2014.02); A61M 16/16 (2013.01); A61M 2016/0021 (2013.01); A61M 2016/0027 (2013.01); A61M 2016/0039 (2013.01); A61M 2205/3365 (2013.01); A61M 2205/3368 (2013.01); A61M 2205/3653 (2013.01)] | 20 Claims |
1. A system comprising:
a flow generator including an outlet, a blower that supplies breathable gas at pressure to the outlet, a pressure sensor that measures a pressure of the gas supplied from the blower, and a flow sensor that measures a flow of the gas supplied from the blower;
an air delivery conduit coupled to the outlet of the flow generator; and
an air delivery control system configured to adjust a speed of the blower, at least in part, by:
estimating a pressure drop that will occur along the air delivery conduit;
determining a pressure set point from a predetermined therapy pressure and the estimated pressure drop that will occur along the air delivery conduit;
correcting a difference between the pressure set point and the pressure measured by the pressure sensor with a pressure controller loop;
determining a feedforward output from the flow measured by the flow sensor; and
adjusting an output of the pressure controller loop with the feedforward output.
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