Nonlinear PID control algorithm and application thereof

Abstract

The invention discloses a nonlinear PID control algorithm. A corresponding nonlinear function is used for carrying out nonlinear conversion of fixed gains KP, KI and KD in a PID controller, and KP[e(t)], KI[e(t)] and KD[e(t)] are constructed to obtain a nonlinear PID control model. A PID control system constructed by the nonlinear PID control algorithm is used for purifying air of a duty room, has the advantages of simple structure, reasonable design, high control precision and the like, is suitable for duty rooms of ultra-long and high-altitude highway tunnel to meet control precision to pollutant concentration, oxygen concentration, temperature and humidity in the duty rooms of the tunnels. Air in the whole duty rooms of the tunnels is clean, is rich in oxygen and is suitable in temperature and humidity, requirements of human bodies to comfort level of the environment are met, and therefore, the PID control system can be popularized and used in a closed duty room environment.

Description

technical field [0001] The invention relates to the technical field of PID control, in particular to a nonlinear PID control algorithm and its application. Background technique [0002] With the development of my country's road transportation industry, the number and scale of my country's road tunnels are constantly increasing. Usually there is a cross passage in the tunnel as a rescue passage. In order to ensure the operation safety of the tunnel, a closed special duty room is set up at the cross passage inside some tunnels. The duty room has greatly improved the safety of tunnel operation, but with the increase of traffic flow, the air quality in the tunnel has declined, and the working environment of the duty room has deteriorated, which has a negative impact on the physical and mental health of the staff. [0003] The existing air purification system adopts traditional PID control. It is difficult for the system to establish accurate mathematical models for parameters ...

AI Technical Summary

Problems solved by technology

The duty room has greatly improved the safety of tunnel operations, but with the increase of traffic flow, the air quality in the tunnel has declined, and the working environment of the duty room has deteriorated, which has a negative impact on the physical and mental health of the staff

[0003] The existing air purification system adopts traditional PID control. It is difficult for the system to establish accurate mathematical models for parameters such as indoor oxygen concentration, CO concentration, temperature and humidity, and the control effect on the above-mentioned controlled objects is poor.

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