增程发动机冷启动及稳定运行的控制策略研究

建立了电动汽车增程器系统的模块化控制仿真平台。将GT-Power中的接口模块与Simulink模块建立耦合模型，进一步通过Matlab/Simulink建立转速控制和空燃比控制模型，研究了增程发动机冷起动及稳定运行时转速和空燃比的控制策略，对比了传统 PID控制方法以及模糊 PID控制方法。结果表明，模糊 PID控制在目标转速以及空燃比的响应速度和误差方面均优于传统 PID 控制；稳定运行时，增程发动机转速保持在最佳工况点 3 000 r/min 附近，实现发动机高效节能。

Research on the Control Strategy of Cold-Start and StableOperation of a Range Extender Engine

To develop more efficient control strategies for extended-range electric vehicles, a modular control simulation platform for the range extender system is established. A coupling model is built by using the GT power/Simulink interface module. The models for speed control and air-fuel ratio control are further created in Matlab/Simulink.The strategies for speed and air-fuel ratio control during cold start and stable operation of the extended-range engine are studied, including the traditional PID control and fuzzy PID control methods. The results show that the fuzzy PID control is superior to the traditional PID control in terms of the response speed and accuracy of the target speed and the air-fuel ratio. During stable operation, the speed of the extended-range engine is maintained near the optimal value of 3 000 r/min, so as to achieve high efficiency and energy savings of the engine.