Power-Split Electromechanical Transmission Design and Validation with Three Planetary Gears for Heavy-Duty Vehicle

摘要

Power-split hybrid electric vehicles (HEVs) utilize planetary gears (PGs) and a relatively small number of frictional elements, including clutch and brake, to connect the power sources together. Recently, power-split HEVs tend to use two PGs and have multiple modes to achieve better driving performance and fuel economy. Looking forward to the future, hybrid powertrain technologies must be enhanced to design hybrid heavy-duty vehicles. To meet the required performance of the heavy-duty vehicles, the need for multi-mode and more PGs is stronger. In this scenario, this paper proposed an electromechanical transmission (EMT) system with three PGs and three frictional elements to combine one engine and two motor-generators with the vehicle. The proposed EMT is explored and designed by a holistic approach, which includes system configuration and operational modes search, dynamic equations derivation and energy management design. Next, the analysis, verification and validation through simulation and comparison with the data actually measured in the bench test are carried out. The excellent agreements between the simulation and the experimental results demonstrate the fidelity and validity of the designed EMT-based power-split HEV model.