Patient air supply device is controlled using characteristic operating curves stored in memory, e.g. for flow rate, electrical power and pressure, which are then used with further parameter measurements to determine other values

摘要

Device comprises radial compressor and drive motor that drives impeller, whereby rotation of impeller generates pressure in gas supply line. Pressure is measured using pressure measurement unit with measurements used by control unit to regulate drive motor speed. Memory contains operating curves, especially for flow rate, electrical power drawn by drive motor and pressure in breathing gas line. Curves are used in controlling air supply. Third curve parameter values are determined from characteristic curves and measured second curve parameter values.