To solve the problem of low control accuracy of the tidal volume emergency ventilation for lower air pressure at high altitudes,we propose a dual-loop PID tidal volume control system,which utilizes a pressure-compensated PID controller to adjust fan speed,supplemented by an integral-separate PID controller in order to achieve precise control of airflow velocity.Compared with single-loop PID control,the rapid response and no overshooting are observed in the performance tests of the dual-loop control system at an altitude of 4 370 m and atmospheric pressure of 59 kPa,in addition,the output error of the average airflow velocity decrease to 3.19％ (the maximum error is 4.1％),which is superior to that of current clinical equipment. Our work offers an effective solution for high-altitude emergency ventilator tidal volume control,and contributes important insights to the development of ventilation control technology in special environments.
关键词
高海拔地区/低气压/急救呼吸机/潮气量控制/气压补偿/双环PID
Key words
high-altitude area/low air pressure/emergency ventilators/tidal volume control/pressure compensation/dual-loop PID
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