  This paper considers the control design for a low-cost ventilator that is
based on a manual resuscitator bag (also known as AmbuBag) to pump air into the
lungs of a patient who is physically unable to breathe. First, it
experimentally shows that for accurately tracking tidal volumes, the controller
needs to be adapted to the individual patient and the different configurations,
e.g., hardware or operation modes. Second, it proposes a set-point adaptation
algorithm that uses sensor measurements of a flow meter to automatically adapt
the controller to the setup at hand. Third, it experimentally shows that such
an adaptive solution improves the performance of the ventilator for various
setups. One objective of this paper is to increase awareness of the need for
feedback control using sensor measurements in low-cost ventilator solutions in
order to automatically adapt to the specific scenario.
