涡扇发动机极值限制保护闭环控制设计

Design of Limit Protection Controller with Closed Loop for Turbofan Engine

现代高性能涡扇发动机采用分段组合多变量控制计划,以发挥发动机工作在整个飞行包线范围内的气动热力设计潜力。为保证发动机在过渡态工作的安全性,控制系统中必须考虑极值限制保护控制的设计问题。为避免直接限制保护控制引发的不同控制通道切换带来的系统震荡问题,提出1种高回路稳态增益的滞后-超前频域校正间接极值限制保护控制器设计方法,在保证限制回路足够的稳态精度和抗噪声能力的同时,又避免了引入积分环节导致相角裕度损失过大的缺点。通过发动机线性模型和非线性模型的控制系统仿真,验证了所述方法设计限制控制器的有效性。

Modern high-performance turbofan engine adopt the project of multi-variable control segmented and combined to play the aerothermodynamic design potential of engine in the whole flight envelope. To ensure the safety of engine work in the transition state, the limit protection control must be considered in control system design. In order to avoid the system oscillations caused by switching the control mode between different state schedules, a design method for limit protection controller is presented, which contains a phase lag-lead frequency compensator with high loop steady gain. The method can guarantee the limit loop enough steady precision and ability to resist noise, and can avoid the phase margin loosed too much brought by integration element at the same time. By the engine control system simulation of linear model and nonlinear model, the effectiveness of the controller design by described phase margin was verified.