Figure 6
From: Control system design for a continuous positive airway pressure ventilator
Original recordings of several breathing waveforms from the experimental CPAP ventilator with PI controller. a) Flow rate. b) Low pressure. c) Airway pressure. The pressure setting is at 8 cmH2O. The maximum inspiratory flow rate is about 50 L/min and the maximum expiratory flow rate about -10 L/min. The output port pressure fluctuation caused by patient's breath is kept within the range of ± 0.5 cmH2O.