增压汽油机面向控制的充量模型及其数值标定

Control oriented intake model and its numerical calibration for a turbocharged gasoline engine

缸内进气量作为电控系统喷油和空燃比前馈控制的基础,对扭矩控制和排放性能至关重要。为了更简便、准确地估算缸内进气量,提出一种面向控制的充量模型,并基于Simulink软件完成该模型的搭建。引入GT-POWER仿真工具辅助标定,完成对充量模型中进气道传热因子、缸内驻留废气关键参数和气门实际流通面积的标定。最后将充量模型计算结果分别与仿真结果及台架试验结果验证对比,提出的充量模型稳态进气量的计算误差均在5%以内,表明提出的充量模型为发动机系统控制提供了一种较为可行的方法。

As the basis for the control of fuel injection and air-fuel ratio feedforward in the electronic control system,the in-cylinder intake air mass is essential for torque control and emission performance.To more simply and accurately estimate the in-cylinder air charge,a control-oriented model for the intake air is proposed in this paper,and based on the Simulink software,the intake model is further established.By introducing the GT-POWER simulations to assist the calibration,the calibration of heat transfer factor of the intake port,the key parameters of the in-cylinder trapped gas and the actual valve flow area is completed in the intake model.Finally,the calculation results of the intake model are compared with the simulation results and test results.The findings show that the calculation errors of the steady-state intake air mass are all within 5%,indicating that the proposed intake model provides a more feasible method for engine system control.