Control method and controller for proportion integration differentiation (PID) control-based breathing machine heating and humidifying system

Abstract

The invention discloses a control method and a controller for a proportion integration differentiation (PID) control-based breathing machine heating and humidifying system and relates to a control method and a controller for the breathing machine heating and humidifying system. The invention comprises a step and a device for acquiring a real-time temperature value, a step and a device for obtaining a temperature departure value, a step and a device for carrying out PID calculations and a step and a device for outputting a PID calculating result to control heating. According to the control method disclosed by the invention, the heating temperature is controlled by adopting an improved PID control method, and the heating can be continuously performed by adding an external execution cycle, so that the heating efficiency is improved. Meanwhile, by the setting of the external execution cycle, the control precision can be improved, and the heating thermal inertia is prevented from being excessively high. An integration operation link is conditionally executed, so that the temperature control reaction is sensitive, the temperature control is stable, safe and reliable, and the operation is simple.

Description

technical field [0001] The invention relates to a control method and a controller for a heating and humidifying system of a ventilator, in particular to a control method and a controller for a heating and humidifying system of a ventilator based on PID control. The method is accomplished by establishing a functional module framework and controlling the computer system by computer program instructions. Background technique [0002] PID (Proportion Integration Differentiation) control has a history of about 70 years, and it is still widely used in industrial control today. The traditional PID control is based on the set value r(t) of a variable and the actual output value y(t) Constitute the control deviation e(t), that is, e(t)=r(t)-y(t), perform proportional, integral and differential operations on the deviation e(t), and then add the results of the operation to obtain the PID The control output of the controller is u(t), and the control system adjusts the variable accordi...

AI Technical Summary

Problems solved by technology

Existing heating and humidification systems of ventilators using steam humidification are slow in response to temperature control. At the same time, because the heating temperature will be affected by factors such as room temperature, airway length, and temperature control system imbalance, it is easy to cause high or low temperature. Low, unstable temperature control, unstable temperature will have a great adverse effect on patients, and even burn the respiratory tract