小型汽油机恒转速QFT鲁棒控制

给出了某小型无人直升机汽油发动机的恒转速鲁棒控制。根据阶跃响应,可辨识得到用于控制器设计的发动机线性区间模型。针对该模型具有不确定性以及进气-做功之间存在时变时滞等特点,采用基于定量反馈理论(QFT)的鲁棒控制方法实现发动机的恒转速控制,使其在严重的负载扰动条件下能准确地跟踪期望的发动机转速。仿真结果表明,该控制器动态响应速度快、对旋翼总距变化等干扰抑制作用强,能使发动机转速稳定在目标转速允许误差范围内,并具有一定的鲁棒性。

Robust Speed Control of Mini Gasoline Engine Based on QFT

A robust speed control of a gasoline engine for a mini unmanned helicopter is presented. A set of linear interval plants used for controller design is developed from step responses. According to the nonlinear nature of the engine and the induction-to-power delay of the manifold filling dynamics, a robust feedback control approach is adopted to realize the speed control of engine based on quantitative feedback theory (QFT), which can provide reference speed tracking despite the presence of torque load disturbances. The off-line simulations show that the proposed engine control strategy has quick transient response and is robust to disturbances such as overall pitch variation.