纯电动车车用复合储能装置控制策略及参数优化

为解决目前纯电动车动力电池比功率不足的缺陷,对纯电动车的储能装置进行了研究。根据复合储能装置的特点和目的,制定了复合储能装置的工作模式,提出了基于速度与电流约束的模糊控制策略。为了进一步提高整车性能并降低蓄电池的输出电流,对复合储能装置的关键参数进行了线性优化,仿真结果表明:加装复合储能装置的纯电动车的加速时间缩短了12%,制动能量回收效率提高了39%,百公里耗电量减少了8.55%,并显著降低了蓄电池的输出电流,有效延长了蓄电池使用寿命和整车的续驶里程。

基于能耗参数辨识和路况预测的剩余续驶里程数据驱动算法

提出了一种基于大数据监控平台的纯电动汽车剩余续驶里程(remaining driving range,RDR)估计算法。首先利用历史运行数据实现车辆纵向动力学参数辨识,并忽略车辆参数变化和其他附件能耗变化。然后采用k近邻法(k-nearest neighbor,kNN)结合实时监控数据完成道路工况预测,进行准确的能耗估算,最终实现RDR估计。与传统的RDR估计相比,提出的方法能将最大误差控制在3km以内,具有更高的估算精度。

基于大数据的电池健康状态(SoH)的估算及应用

为了突破因电池管理系统(BMS)存储和计算能力不足导致的传统电池健康状态(SoH)估算方法的局限,提出了基于互联网平台在线大数据的SoH估算方法。研究了数据离散特性、电池单体一致性等因素对此估算方法的影响;结合某平台的在线大数据进行了此方法的集成应用,对单车以及分车辆品牌、分地域、分时域进行了多维度的电池SoH衰减比较验证。结果表明:此方法能够有效估算单个动力电池系统的SoH及其变化,并且能够与其他数据类型进行多维度整合,对动力电池进行大数据画像分析。

Parameter design and performance analysis of zero inertia continuously variable transmission system

In order to solve the problem of weak power performance of vehicle equipped with continuously variable transmission(CVT) system working under transient operating conditions, a new CVT equipped with planetary gear mechanism and flywheel was researched, a design method of transmission parameter optimization was proposed, and the comprehensive matching control strategy was established for the new transmission system. Fuzzy controllers for throttle opening and CVT speed ratio were designed, and power performance and fuel economy of both vehicles respectively equipped with conventional CVT system and new transmission system wrere compared and analyzed by simulation. The results show that power performance and fuel economy of the vehicle equipped with new transmission system are better than that equipped with conventional CVT, thus the rationality of the parameter design method and control algorithm are verified.