Open-loop control method and system for ventilator fan

Abstract

The invention discloses an open-loop control method and a control system of a fan of a breathing machine. The open-loop control method comprises the following steps: under a working mode of the breathing machine, setting a target pressure P of a pre-outputted airflow of the breathing machine; collecting a real-time flow value F of the airflow outputted by the breathing machine by virtue of a flow sensor; in accordance with the target pressure P, the real-time flow value F and a fan control volume calibration table, calculating a fan control volume DFP required by outputting the target pressure P at the real-time flow value F in accordance with a preset rule, wherein m*n pieces of output pressure values, which are in corresponding to m pieces of preset flow values under n pieces of preset fan control volumes, are saved in the fan control volume calibration table, and both m and n are positive integer; and controlling the fan of the breathing machine in accordance with the fan control volume DFP. According to the control method and the control system disclosed by the invention, the possibility that the output pressure is fluctuated can be reduced, and the fan of the breathing machine can keep stable pressure output under different flow rates.

Description

technical field [0001] The invention relates to the technical field of ventilators, in particular to an open-loop control method and system for ventilator fans. Background technique [0002] As the number of patients with sleep apnea syndrome increases year by year, the market for ventilators is getting bigger and bigger, and patients' requirements for ventilators are also getting higher and higher. Comfort has become one of the important indicators for people to choose a ventilator. Comfort includes not only trigger replacement (that is, human-machine synchronization), but also pressure stability. [0003] At present, most ventilators are pressure output ventilators, and the fan pressure control system mainly adopts closed-loop control. In this closed-loop control mode, when the pressure detected by the pressure sensor is greater than the target pressure, the power of the fan will be reduced; The target pressure coincides. However, there are two main disadvantages in the...

AI Technical Summary

Problems solved by technology

However, there are two main disadvantages in the closed-loop control of the fan: one is that the pressure tends to oscillate up and down during the adjustment process; The pressure sensor of most ventilators is located at the front of the water box, and the pressure at the front and end of the water box is also related to the flow rate, so the stability of the air pressure after passing through the water box cannot be guaranteed

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