Infant incubator temperature and humidity control system has strong temperature and humidity coupling relationship

which is the key factor of its time denaturation and hysteresis.The feedforward decoupling method of fuzzy proportional-integral-differential（PID） control method

the temperature and humidity is obtained first combined with mechanism analysis and system identification system model of double circuit system

and then add feedforward decoupling controller in control system

make originally the mutual coupling of temperature

humidity variable equivalent to two independent temperature and humidity control subsystem

finally

the decoupling circuit introduced in fuzzy PID control mechanism

establish fuzzy gain controller to increase the adaptability of the system.Under the standard condition of setting the initial environment temperature as 28 ℃ and the initial environment relative humidity as 60 %RH

the improved decoupling loop is simulated.According to the simulation results

compared with the traditional PID decoupling control system

the temperature and humidity overregulation of the fuzzy PID decoupling control system decreased from 3.2 ℃ and 10.7 %RH to 0.8 ℃ and 7.4 %RH respectively

and the adjusting time of temperature and relative humidity decreased by 190 s and 230 s.The decoupling effect is relatively ideal

and the stability and response speed of the double-loop control system are greatly improved.