1. A pressure maintenance system (50), comprising: a pressure generator (52)； a pressure sensor (68)； a flow sensor (62)； an controller (64) interacting with a pressure sensor and a flow sensor for controlling the operation of the pressure generator, the controller being configured to automatically identify the patient interface device used with the pressure maintenance system by detecting a change in the output stream up to a predetermined value with a predetermined range pressure gradient pressure maintenance system 2. The system of claim 1, wherein the controller is further configured to identify a change in flow rate using a flow sensor, wherein the change in flow rate is the difference between two different flow readings from the flow sensor taken at two different pressure values from the pressure sensor. . The system of claim 1, wherein the predetermined value is approximately 5% and the predetermined pressure gradient is approximately 5%. The system of claim 1, wherein the predetermined value is approximately 10% and the predetermined pressure gradient is approximately 50%. The pressure maintenance system according to claim 1, wherein the predetermined value is approximately 25% and the predetermined pressure gradient is approximately 100%. The system of claim 1, wherein the controller is further configured to automatically identify the type of mask as the patient interface device used； and in which the controller is further configured to control1. Система (50) поддержания давления, содержащая:генератор (52) давления；датчик (68) давления；датчик (62) расхода； иконтроллер (64), взаимодействующий с датчиком давления и датчиком расхода для управления работой генератора давления, причем контроллер выполнен с возможностью автоматической идентификации устройства интерфейса пациента используемого с системой поддержания давления, путем обнаружения изменения выходящего потока вплоть до заранее определенной величины при заранее определенном градиенте давления диапазона
