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在被控系统的微分方程和对传感器、控制器及控制阀分析的基础上，本文推出了排气口闭合回路的传递函数和框图。虽然有效抽气速度与控制阀开启角度之间关系是时变的，但非线性，因此传递元素必须是线性化。之后，研究了以此方式定义的闭环控制的阶跃特性和扰动特性。其次，排气口闭环控制参数优化是可行的。通过计算机仿真确定优化参数，这些优化参数是设计新型排气口压力控制器的基础。
Based on the differential equations of the controlled system and the analysis of sensors, controllers and control valves, this paper presents the transfer function and block diagram of the closed circuit of the exhaust port. Although the relationship between effective pumping speed and control valve opening angle is time-varying, it is non-linear, so the transfer element must be linear. After that, the step characteristics and perturbation characteristics of the closed-loop control defined in this way are studied. Secondly, it is feasible to optimize the closed-loop control parameters of the exhaust port. Optimization parameters are determined by computer simulation, and these optimization parameters are the basis for designing a new exhaust pressure controller.