Valve control system on a venturi to control FiO2 a portable ventilator with fuzzy logic method based on microcontroller

Abstract

<p>The results of several studies for portable ventilators state that it is difficult to<br />regulate oxygen levels of fraction of inspired oxygen (FiO2) that are in<br />accordance with what is needed directly during the implementation of oxygen<br />therapy. Some portable ventilators cannot set the FiO2, so the ventilators work<br />with a fixed FiO2. To overcome this problem, medical oxygen with a level of<br />100% is lowered by mixing with free air with an oxygen content of about 40%.<br />Mixing is carried out using a venturi with a large/wide hole that can be<br />adjusted using a slated disk rotated by a direct current motor. The rotation<br />control method uses Mamdani's fuzzy logic. The results of clinically lab-scale<br />testing show that the fuzzy logic control system is able to control the average<br />error pressure of 10.3%, better when compared to the on-off control method,<br />which is 14.5%. The fuzzy logic method is able to increase the accuracy of<br />FiO2 on a portable ventilator.</p>