基于LMI活塞式发动机恒转速H_∞动态输出反馈控制
Piston engine speed H_∞ dynamic output feedback regulation based on LMI
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摘要: 汽油发动机具有非线性、时变时滞等特点, 传统PID控制方法很难保证发动机整个工作范围内恒转速控制的稳定性及性能要求.采用基于LMI(linear matrix inequality)的输出反馈H∞控制算法, 来实现活塞式汽油发动机的恒转速控制, 使其在负载扰动、工况变化和可变时间延迟的情况下都能保持期望的参考转速.离线仿真结果表明, 所设计的控制器满足小型无人直升机对发动机控制的抗干扰性、跟踪性要求, 并具有一定鲁棒性.Abstract: Classical proportional integral derivative(PID) speed regulation method provides no guarantees for closed-loop system stability or performances for the full operating range of a piston engine due to the existence of nonlinear behavior,and time varying dead time.In this work,an H∞ dynamic output feedback approach is employed for the control of the piston engine based on linear matrix inequality(LMI),which can provide reference speed tracking despite the presence of torque load disturbances,operating condition changes and variable time delays.The off-line simulations show that the proposed controller can meet the performance requirements for the unmanned helicopter engine use,namely,tracking performance,disturbance rejection and robustness.
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Key words:
- aerospace propulsion system /
- piston engine /
- unmanned helicopter /
- H∞ control /
- time delay /
- disturbance rejection
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