基于LPV状态空间模型的小型航空煤油二冲程发动机喷油控制策略

为了简化基于平均值模型的喷油控制模型的计算,根据线性变参数(LPV)状态空间模型原理,在平均值模型的基础上建立了LPV状态空间喷油控制模型,利用Matlab/Simulink工具对稳态工况和瞬态工况的喷油脉宽控制模型进行仿真,最后在发动机试验台架上进行试验验证.仿真和试验结果表明:①基于LPV状态空间模型的喷油控制模型能够满足瞬态工况和稳态工况控制的要求,计算的喷油脉宽精度略低于平均值模型,由于LPV状态空间模型计算简单,能够直接应用于控制算法的设计,因此在工程中容易实现.②与插值算法相比,基于LPV状态空间模型的控制策略使发动机的动力输出有所下降,主要是由于模型简化造成进气空气流量减小引起的. 

Fuel injection control strategies based on LPV state-space model for small two-stroke aviation kerosene engine

To simplify the calculation of fuel injection control model based on the average model, a linear parameter varying (LPV) injection control state-space model was established based on the average model according to LPV state-space model principles. On this basis, the fuel injection pulse width control model under steady operating conditions and transient operating conditions was established, then simulated by Matlab/Simulink tool, and finally verified in an engine test bed. The simulation and test results show that:(1) the LPV state-space fuel injection control model meets the control requirements under steady and transient operating conditions. Although the accuracy of calculated fuel injection pulse width is slightly lower than that of the average model, the LPV state-space model calculation is simple, and can be directly used in the injection control algorithm design and easy to implement in engineering. (2) Compared with the interpolation algorithm, the control strategy based on the LPV state-space model leads to a lower engine power output, mainly owing to the simplified model that results in a reduced intake air flow rate.