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考虑道路坡度对整车驱动需求的影响,针对插电式混合动力汽车,提出基于道路坡度信息的插电式混合动力汽车能量管理策略,进行车载导航系统在整车能量管理策略中应用的初步探究.根据车载导航系统提供的道路信息,建立坡道行驶电量消耗预估模型,分别对行程中电量消耗阶段和电量维持阶段动力电池的荷电指数进行规划,提出行车预充电时刻规划准则,使车辆在坡道行驶前动力电池的荷电指数达到预定值,保证车辆在坡道行驶时不会因动力电池亏电造成动力不足或过放电有损动力电池的使用寿命,并在上坡行驶结束后动力电池的荷电指数下降到临界值,有利于充分吸收制动回收的电能.利用MATLAB/Simulink仿真平台,对提出的能量管理策略进行仿真验证.本文所提出的基于坡道预测的能量管理策略能够避免动力电池的过放电,确保车辆上坡行驶过程电量充足.
Considering the influence of road gradient on the demand of vehicle driving, this paper proposes a plug-in hybrid vehicle energy management strategy based on road gradient information for plug-in hybrid vehicles, and then makes a preliminary study on the application of vehicle navigation system in vehicle energy management strategy According to the road information provided by in-vehicle navigation system, the forecasting model of ramp electricity consumption is established, and the power consumption index of power battery in power consumption stage and power maintenance phase are planned separately. The planning guidelines of pre-charge time are put forward, Before the ramp driving power battery charge index reaches a predetermined value to ensure that the vehicle driving in the ramp will not be due to power battery power shortage caused by insufficient power or over-discharge damage to the life of the battery power and driving uphill after the end The charge index of the power battery drops to the critical value, which is beneficial to fully absorb the electric energy recovered by the brake.Based on MATLAB / Simulink simulation platform, the proposed energy management strategy is verified by simulation.The energy management strategy based on the ramp prediction To avoid over-discharge battery, to ensure adequate vehicle power uphill driving process.