柴油机油量执行器的干扰估计滑模控制方法
Sliding mode control method for diesel engine fuel quantity actuator with disturbance estimation

油量执行器是电控分配泵的核心部件之一, 其直接控制着柴油发动机的燃油喷射量. 模型非线性与外部扰 动是油量执行器系统中不可避免的影响因素, 前期的许多研究忽略了这些非线性, 使得闭环系统性能并不理想. 本 文考虑了旋转电磁铁和复位弹簧等非线性特性的建模, 得到了油量执行器系统的数学模型. 进而, 在基于模型对系 统非线性进行抵消之后引入扩张状态观测器对系统外部干扰和不确定性进行估计, 设计了基于扩张状态观测器的 滑模控制律. 该控制律在保证鲁棒性的同时, 可以使得切换增益幅值更小, 有利于减小滑模控制的抖振问题. 最后, 通过MATLAB/Simulink仿真和dSPACE平台实验验证了所提方法的可行性和有效性.
Fuel quantity actuator is a core component in electronically controlled distributor pump which is used to control the fuel injection quantity for diesel engines. In the fuel quantity actuator system, there exist nonlinearities and disturbances. Previous researches usually neglect the nonlinearities and it makes the performance of the closed loop system is not ideal. Considering the modelling of nonlinear characteristics such as the rotating electromagnet and the Offsetting springs, this paper establishes the mathematical model of the fuel quantity actuator system. After canceling the system nonlinearity based on the model, an extended state observer based sliding mode control approach is presented. By using an extended state observer, the lumped disturbances and system uncertainties can be estimated asymptotically. In the proposed control law, the designed switch function gain can be selected smaller than the conventional sliding mode controller. While guaranteeing robustness, the chattering problem can be alleviated. Both feasibility and efficiency have been validated by simulations and experiments based on the dSPACE real-time control test setup.