【摘要】 混合动力汽车存在多种驱动模式,模式切换过程中相关动力源输出转矩的协调控制对车辆动力性及驾驶性能有重要影响。以四轮驱动混合动力轿车为研究对象,针对其在驱动过程中的模式切换可能导致的驾驶性能变差问题,重点考察纯电动向四轮混合驱动模式的切换过程,考虑动力耦合过程发动机和轮毂电机间动态特性的差异,设计出无扰动模式切换控制策略。在Matlab/Simulink/SimDriveline软件平台上建立四轮驱动混合动力轿车前向仿真模型,对模式切换控制策略的性能进行模拟。仿真和实车试验结果表明:所设计的模式切换控制策略可保证模式切换过程中的动力传递平稳性,有效地抑制了因动力耦合所造成的纵向冲击,在满足驾驶员需求转矩的前提下,提高了四轮驱动混合动力轿车的驾驶性能。更多还原

【Abstract】 There are many driving modes existing in the hybrid electric vehicle(HEV),the torque coordination problem of related power sources during the transition of different modes is essential to vehicle’s power and drivability performance.Based on the four wheel drive hybrid electric car,focusing on the switching from pure electric mode to hybrid four wheel drive mode as well as considering the difference of dynamic characteristics between ICE and in-wheel motors,bumpless mode switching control strategy is designed in order to solve drivability issues caused by propulsion mode’s change during the vehicle running process.Forward simulation model of four wheel drive HEV is built on Matlab/Simulink/SimDriveline platform,simulation and real vehicle road test of mode switching control strategy are carried out.Results show that the designed control strategy can ensure a smooth power transfer during the mode switching process,and can effectively suppress the longitudinal impact caused by power coupling.Finally an enhanced drivability is achieved on condition of satisfying driver’s requirement on torque.更多还原