Abstract
The dual-motor coupling drive system (DCDS), which is widely used in electric vehicles, has attracted increasing attention due to its high transmission efficiency and economical fuel consumption. Current research has mainly focused on the control scheme of dual motors and has ignored the dynamic characteristics of the asymmetrical transmission structure. This paper presents an investigation of a dynamic model and an analysis method of the transmission process for the DCDS. The entire dynamic model of the DCDS was established by considering the planetary gear, differential bevel gear, and drive shaft with the transfer matrix method (TMM). Then, a detailed theoretical analysis was developed to study the influence of meshing stiffness and excitation source on the dynamic characteristics. Finally, the DCDS experimental platform was utilized to validate the effectiveness of the proposed dynamic model. For susceptibility to low-frequency vibrations, the first four natural frequencies and vibration modes of the DCDS were analyzed through the processing and analysis of acceleration signals. The experimental dynamic responses were generally consistent with the numerically computed results, which demonstrates the effectiveness of the proposed dynamic model with TMM. Furthermore, the proposed dynamic analysis method may be helpful for developing effective control algorithms to suppress vibrations and achieving highly smooth motions for electric vehicles.
Highlights
With the increasing demand for a green economy and environmental protection, modern vehicles are required to produce zero emissions, much less pollution, and little noise [1]
The dynamic model of the dual-motor coupling drive system (DCDS) is established by considering the transmission process of the planetary gear, differential bevel gear, and drive shafts
To verify the proposed comprehensive dynamic model of the DCDS, the natural frequency and dynamic response were tested by experiment
Summary
With the increasing demand for a green economy and environmental protection, modern vehicles are required to produce zero emissions, much less pollution, and little noise [1]. Compared with a normal single-motor driving axle system, the DCDS, which adopts two motors rather than a high-peak-power motor, can significantly improve a vehicle’s dynamic performance and energy efficiency [5]. The drive power of the dual-motor system is synthesized gear, a differential bevel gear, and so on. The main motorthe is operated at a rated to improve energy efficiency. The assistant motor is controlled to adjust operated at a rated speed to improve energy efficiency. The assistant motor is controlled to adjust the operated at a ratedTospeed to improve energy efficiency. To improve the smoothness of stepless speed regulation, the dynamic and vibration characteristics characteristics of of the the DCDS.
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