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发动机自动起停是混合动力汽车节能减排的重要手段,对混合动力汽车的起动性能提出了更高的要求。混合动力汽车的ISG(Integrated Starter Generator)起动相比传统车的起动机起动可以获得更好的油耗、排放、振动和噪声性能。文中结合所研发的ISG型混合动力汽车,通过试验分析现有发动机起动过程的控制效果。为解决现有控制算法存在的转速超调量大的问题,设计了发动机起动过程的转速闭环控制算法,搭建了控制器和被控对象仿真模型。通过仿真分析研究了不同控制参数对起动过程转速控制效果的影响,得出了减少发动机喷油转矩和提高ISG转矩变化率限制可以改善转速控制效果的结论,为后续控制算法的改进和实车控制参数的标定提供了依据。
Automatic starting and stopping of the engine is an important means of energy saving and emission reduction for hybrid vehicles, and puts forward higher requirements on the starting performance of the hybrid vehicle. ISG (Integrated Starter Generator) start-up of hybrid vehicles can achieve better fuel consumption, emissions, vibration and noise performance than the start-up of conventional vehicles. Based on the developed ISG hybrid vehicle, the control effect of the existing engine starting process is analyzed through experiments. In order to solve the problem of large speed overshoot of existing control algorithms, a closed-loop speed control algorithm for engine starting process was designed and a controller and controlled object simulation model was built. The influence of different control parameters on the speed control of the starting process was studied through simulation analysis. The conclusion that reducing the fuel injection torque of the engine and increasing the ISG torque variation rate limit can improve the speed control effect was obtained. In order to improve and implement the subsequent control algorithm, Vehicle control parameters provided the basis for calibration.