摘要
建立了汽油直喷(GDI)发动机燃油共轨系统的数学模型,基于燃油流量连续性方程和压力变化率方程构建各组件之间的流量和压力传递关系,并利用MATLAB/SIMULINK建立了面向控制的动态模型来估计燃油轨压。在发动机试验台上分别进行了转矩突变和转速突变时的轨压阶跃响应试验,利用实测的数据对模型进行检验。结果表明,轨压模型的拟合度大于98%,稳态误差小于3%。
A mathematical model of the fuel common rail system for gasoline direct injection(GDI)engine was established.Based on the fuel flow continuity equation and pressure change rate equation,the flow and pressure transfer relationships between components were constructed.Using the MATLAB/SIMULINK,a control-oriented dynamical model was established to estimate fuel rail pressure.The step response tests for rail pressure under abrupt torque change and abrupt speed change were performed on the engine test bench,and the model was tested using the measured data.The results show that the fitting accuracy of the rail pressure model is greater than 98%,and the steady-state error is less than 3%.
作者
刘文宪
滕勤
张华
Liu Wenxian;Teng Qin;Zhang Hua(School of Automotive and Traffic Engineering,Hefei University of Technology(Hefei,Anhui,230009,China;Information Network Security Supervision Department,Anhui Public Security College)
出处
《小型内燃机与车辆技术》
2018年第6期1-6,共6页
Small Internal Combustion Engine and Vehicle Technique
