This study presents an adaptive dual closed-loop speed control strategy for the natural gas engine used in a range extender to improve the robustness against parameter uncertainties, unmodeled dynamics and unknown disturbance. Compared to existing methods, this strategy takes into account the influence of the throttle valve dynamics on the intake airflow in the design of the inner-loop intake pressure controller, which is strongly nonlinear, and considers the inaccuracy of the output torque as well as unknown disturbance in the outer-loop speed controller design, which is more practical. Furthermore, the controller is incorporated with an adaptive strategy to overcome the uncertainty of parameters using the information of the engine speed and the intake pressure. Theoretical analysis indicates that this strategy can meet the demands of the wide range speed regulation of the range extender engine without knowing the specific values of the engine parameters. Moreover, the capability of the proposed controller to preserve the performance in the presence of disturbance in various working conditions is evaluated by co-simulation on the platform of Matlab/Simulink with GTpower and experiments on a range extender.

这项研究提出了一种适用于增程器的天然气发动机的自适应双闭环速度控制策略，以提高其针对参数不确定性，未建模动力学和未知扰动的鲁棒性。与现有方法相比，该策略在设计内环进气压力控制器的过程中考虑了节气门动力学对进气气流的影响，该设计是强非线性的，并考虑了输出转矩的误差以及未知在外环速度控制器设计中出现干扰，这更加实用。此外，该控制器还采用了自适应策略，以利用发动机转速和进气压力的信息克服参数的不确定性。理论分析表明，该策略可以在不知道发动机参数具体值的情况下，满足增程器发动机大范围调速的要求。此外，通过在Matlab / Simulink平台上与GTpower进行协同仿真并在增程器上进行实验，评估了所提出的控制器在各种工作条件下存在干扰的情况下保持性能的能力。