Abstract: Extended-range hybrid electric vehicles with range extenders as the core and plug-in hybrid electric vehicles equipped with 1-speed, 2-speed and 3-speed hybrid-dedicated transmissions both maintain rapid growth in the current market. This paper conducts a comparative study on hybrid-dedicated transmissions from the perspectives of structural characteristics, fuel economy, power performance, cost, and engine noise, vibration and harshness (NVH). The results show that range extenders feature excellent engine NVH performance but relatively high fuel consumption, thus being suitable for hybrid electric vehicles with long all-electric driving ranges; 1-speed hybrid systems have the most balanced comprehensive performance and can adapt to hybrid electric vehicles with different all-electric driving ranges; 2-speed and 3-speed hybrid-dedicated transmissions have better fuel economy and power performance, and this advantage is more likely to be highlighted in hybrid electric vehicles with short all-electric driving ranges; 3-speed hybriddedicated transmissions deliver stronger power output in parallel mode, which is also critical for high-performance hybrid electric vehicles. Carrying out platform planning of hybrid-dedicated transmissions in combination with vehicle positioning has important reference value.

Key words: dedicated hybrid transmission; fuel economy; power performance; engine NVH

摘要： 当前市场中，增程器为核心的增程式混合动力汽车，与搭载单挡、2 挡、3 挡混动专用 变速器的插电式混合动力汽车均呈快速增长态势。文章从结构特性、燃油经济性、动力性能、 成本及发动机噪声、振动与声振粗糙度（NVH）维度，对混动变速器开展对比研究。结果表 明，增程器的发动机 NVH 表现优良，但油耗偏高，适用于长纯电续航里程混合动力汽车；单 挡混动系统综合性能最为均衡，可适配不同纯电续航里程混合动力汽车；2 挡、3 挡混动专用 变速器具备更优燃油经济性与动力性能，该优势在短纯电续航里程混合动力汽车中更易凸显； 3 挡混动专用变速器在并联模式下动力输出更强，对高性能混合动力汽车同样至关重要。结 合车型定位开展混动专用变速器平台规划，具有重要参考价值。

关键词: 混动专用变速器；燃油经济性；动力性；发动机 NVH