【摘要】 对48V轻度混合动力系统的控制策略进行了研究,包括智能起停、制动能量回收、转矩助力、电池管理系统。利用整车动力学仿真软件Advisor建立了48V系统的仿真模型,将仿真结果与12V起停系统进行对比。结果表明:48V系统起停功能的节油效果与12V系统相当,新欧洲行驶循环(NEDC)测试循环下节油约为5%;48V系统采用的12kW起停电机使得制动能量回收的节油效果更加明显,NEDC工况下48V系统的总节油率为13%。此外,转矩助力功能可以为汽车提供20~30N·m的转矩,从而调节电池SOC及优化发动机工作点。更多还原

【Abstract】 The control strategy of 48 V mild hybrid system was researched,including the start-stop,braking energy recovery,torque boost and battery management system.Then,a simulation model for 48 V system was built with the Advisor,a king of vehicle dynamics simulation software.The simulation results were compared with the experiment results of 12 V system.The conclusion is as follows:the 48 V system can get 5% fuel saving in the NEDC test cycle with start-stop,same as 12 V system.Due to use of the 12 kW start-stop motor,the 48 V system can save more fuel with the braking energy recovery,totally getting 13% gasoline saving in the NEDC test cycle.In addition,the torque boost can provide 20 to 30 N·m torque for vehicle,which can regulate the SOC of battery and optimize engine operating points.更多还原