Method and system for fast boosting and reducing pressure of respirator

Abstract

The invention discloses a method for fast boosting and reducing pressure of a respirator. The method includes the steps of establishing a correspondence table; assuming that a pressure boosting and reducing process of the respirator is a process of accelerated boosting, transitioning at constant speed and then decelerated reducing, and by combining with a given pressure boosting speed of the respirator, obtaining the output pressure of the respirator at any time; obtaining the actual output pressure and flow of the respirator at the current time, and checking the corresponding relationship table to obtain a corresponding rotating speed of a fan and to obtain the output pressure of the respirator after n time from the current time at the same time; checking again the corresponding relationship table to obtain the corresponding rotating speed of the fan, and combining with a conversion relationship between the rotating speed of the fan and current of the fan to obtain the exact current magnitude of the fan to control the fan to increase or decrease the speed according to the current magnitude of the fan; detecting whether or not the difference between the actual output pressure of the respirator and target output pressure is within an error range, and conducting the steps above in cycle till the pressure boosting process or the pressure reducing process ends. According to the method, the adjustment speed of boosting and reducing the output pressure of the respirator is greatly increased, and problems such as over-adjustment cannot occur.

Description

Technical field [0001] The invention belongs to the technical field of ventilator, and in particular relates to a method and system for rapid pressure rise and fall of a ventilator. Background technique [0002] At present, fan control is usually controlled by a control algorithm referring to real-time pressure and then using PID or an open-loop algorithm, that is, the control algorithm first obtains the real-time output pressure of the ventilator through a pressure sensor. Then according to the difference between the real-time output pressure and the required target output pressure, decide to increase or decrease the current to control the fan until the difference between the real-time output pressure and the target output pressure is less than the error range, and then stop the fan adjust. For example, patent number CN200710178618.7 is a ventilator and a pressure control method. The ventilator includes a casing, which is characterized by including: a turbo fan for generating a...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and provides a method for rapidly increasing and decreasing the pressure of the ventilator to solve the problem that the prior art cannot Know exactly how much to increase or decrease the current of the control fan so that the final real-time output pressure of the ventilator is just around the target output pressure, and the output pressure of the ventilator is too slow to rise and fall, and the output pressure of the ventilator is caused by excessive adjustment. Oscillation or the problem that the difference between the output pressure and the target output pressure exceeds the allowable range of error

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