Design Of Ventilator Control System Based On CAN Bus

The ventilator is one of the most necessary rescue equipments in hospital,and the important tool can lengthen the life and strive for the precious time for the further treatment. In the decade, the modern ventilator developed quickly with the research of machinery ventilated technologies, with the application of new technologies and the improvement of clinic requests. But at present the ventilators especially made in china have some gaps in precision, comfort and reliability.This topic goal is to design a ventilator that can be easy to operation and carry on the accurate reliable monitoring to the patient, through the technologies of can bus and liquid crystal display and the proper choice of pressure and flow sensors with high sensitivity.This thesis focuses on the methods of the graphical LCD display complex ventilator-control information based on the WINCE platform and it discusses the design and implementation of this system. Theoretically, the instruments collects a variety of digital and analog data, such as pressure and flow data, and other from the CAN bus as a node, analysis the data by ARM, display the data use LCD display and graphics dynamic LCD mode, and it can respond by interactive touch screen, with multifunctional and high precision characteristics, not only it takes care of the doctors habits, but also takes use of the advantages of modern electronics technologies, and all these can be set easily.Basing on CAN bus technology, Embedded is a very good platform for expansion, which is the essential difference between the host and traditional instruments. And thus ventilator -control parameters and breathing mode can be chosen, control parameters of ventilator are calculated. And finally they are sent to respirator to realize real-time control. Responding alarms can be activated respectively while ventilator fails in order to ensure the safety of the ventilator. The results prove that the practice is of practical significance, such as readability, accuracy, intelligence and expansibility. And it is the inevitable trend of the development of intelligent ventilator.