Application Analysis of Multi-Gears Hybrid Powertrain Based on eTC-DIG

Abstract

本文介绍了一种具有10个以上挡位速比的混合动力系统。该系统由一个混动电力变矩模块(eTC)和一个双输入轴齿轮箱(DIG)组成。eTC模块包括电机、行星齿轮组(PGS)和离合器。PGS的旋转元件分别与发动机轴、电机轴和DIG的两个输入轴相连，形成“双动力 + 双自由度 + 双输入”系统。本文详细分析了基于eTC-DIG的混动系统构型结构与运行模式，并针对一款越野车型应用该混动系统进行了经济性仿真。结果表明，该混动系统可实现多种工作模式，去除了DCT的双离合器，大大降低成本和风险；在每个奇数齿轮组和相邻的偶数齿轮组之间产生一个新的挡位速比，使得原变速器挡位数翻倍；多档位有利于优化发动机工作区域，WLTC循环工况下油耗减小了26%，大大提升了车辆的燃油经济性，具有很好的市场应用价值。 The hybrid power system with more than 10 gear ratios is introduced in this paper. The system consists of a hybrid electric torque converter module (eTC) and a double input shaft gear box (DIG). The eTC modules include motor, planetary gear set (PGS) and clutch. The rotating elements of PGS are connected with the engine shaft, motor shaft and two input shafts of DIG respectively to form a “double power + double freedom + double input” system. In this paper, the configuration structure and operation mode of the hybrid system based on eTC-DIG are analyzed in detail, and the economic simulation of the hybrid system is carried out for an off-road vehicle. The results show that the hybrid system can realize a variety of working modes and eliminate the dual clutch of DCT, which greatly reduces the cost and risk. A new gear ratio is generated between each odd gear set and the adjacent even gear set, which doubles the number of gears in the original transmission. Multi-gear is conducive to optimizing the engine working area, and the fuel consumption of WLTC cycle is reduced by 26%, which greatly improves the fuel economy of the vehicle and has a good market application value.