发动机性能测试及扭矩控制原型建立方法研究

Engine Performance Testing and Torque Control Prototype Constructing

分析了混合动力系统中发动机的工况特点,阐述了发动机性能自动测试方法,给出了如何运用MATLAB软件对测试数据进行插值、瞬态数据降噪及获得建立查表模型所需数据的方法。运用MATLAB/SIMULINK建立了发动机稳态扭矩控制原型和瞬态扭矩估计模型,并基于dSPACE系统将所建立的控制原型用于台架试验。试验结果表明:稳态扭矩控制原型的控制误差在5%以内,瞬态扭矩估计模型的估计误差在中高负荷时小于5%,两个模型均能满足并联混合动力系统工作模式切换协调控制的需要。

The operation characteristic of internal combustion engine in hybrid powertrain was analyzed, the automatic test method for engine performance was described, the method for data interpolation and data noise reduction as well as for obtaining the required data using look-up-table of MATLAB software was presented. A steady torque control prototype and transient torque estimation model were constructed by MATLAB/SIMULINK, and based on the dSPACE system, the constructed torque control model and the torque estimation model were validated on engine test bench. The test results show that the control error of steady torque control model is less than 5%, and the estimation error of transient torque estimation model is less than 5 % when engine operates at middle and high load, both models can satisfy the requirement for coordinated mode switch control in parallel hybrid powertrain.