The objective of this study was to evaluate the performance of 24 basic hydrodynamic mechanical power-split (HMPS) transmission designs effectively based on their torque multiplication capacities (TMCs) and efficiencies. Firstly, four schemes were preliminarily selected. Secondly, the matching between the four schemes and a reference wheel loader was considered, and an expression for the TMC was developed based on the traditional transmission and a second reference transmission. Thirdly, two performance metrics in terms of the TMC and efficiency – the average torque multiplication capacity (ATMC) and average efficiency – were defined to eliminate the couplings of four transmission parameters with the vehicle speed and speed ratio. Finally, the performances of the two best schemes and traditional hydrodynamic mechanical (HM) transmission were carefully compared. The results show that a transmission with power recirculation cannot present energy savings potential regardless of the ATMC, whereas a transmission with a power split can achieve an ATMC of 0.255, an average efficiency increment of 0.0143 in the short loading cycle, and a miniscule efficiency increment in the long loading cycle compared with the HM transmission.

本研究的目的是根据扭矩倍增能力 (TMC) 和效率，有效评估 24 种基本流体动力机械动力分流 (HMPS) 变速器设计的性能。首先，初步选定了四个方案。其次，考虑了四种方案与参考轮式装载机之间的匹配，并在传统传动和二次参考传动的基础上开发了TMC的表达式。第三，定义了 TMC 和效率方面的两个性能指标——平均扭矩倍增能力 (ATMC) 和平均效率——以消除四个传动参数与车速和速比的耦合。最后，仔细比较了两种最佳方案和传统流体动力机械 (HM) 传动的性能。结果表明，无论ATMC如何，具有动力再循环的变速器都不能表现出节能潜力，而具有功率分流的变速器可以达到0.255的ATMC，在短负载周期内平均效率增量为0.0143，并且效率增量很小与 HM 传动相比，在较长的加载周期中。