Piston engine speed H_∞ dynamic output feedback regulation based on LMI

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.