Abstract
In this study, a planetary gear based dual motor coupling electric vehicle is proposed, which achieves higher system efficiency by enabling motor working under high operating efficiency area. Firstly, the dynamic characteristics of the proposed configuration are analyzed and the reasonable working modes are established. Secondly, the optimal dual motor parameters are derived according to the statistical analysis on the typical driving conditions and the collected real road driving data. Especially, the optimal parameters of planetary gear and final transmission ratio are obtained using particle swarm optimization algorithm. Finally, based on the developed mode shift algorithm, the dual motor coupling full vehicle model is developed and the vehicle performance is analyzed using MATLAB/Simulink. For the UDDS (Urban Dynamometer Driving Schedule) driving cycle, it is seen from the simulation results of motor operating points that the proposed dual motor configuration is mostly operated under the high efficiency range, and the power consumption is significantly reduced by 7.6% compared with the single motor configuration. For the NEDC (New European Driving Cycle), WLTC (Worldwide Harmonized Light Vehicles Test Cycle) and real road driving conditions, the proposed dual motor configuration also achieves system efficiency improvement of 5.0%~16.3%, which confirms the validity of the proposed configuration and its corresponding parameter matching and control algorithm development.
Highlights
With the global energy shortage and the increasingly serious environmental pollution, the popularization and promotion of new energy vehicles become increasingly important [1,2].As one of the new energy vehicles, electric vehicle (EV) has high energy efficiency, which can truly achieve pollution-free and zero emission
In order to achieve the optimal high system efficiency of the dual motor configuration, the parameters of the two motors are derived through the motor high efficiency operating range under corresponding driving conditions
The simulation results show that the velocity can follow the actual velocity closely and the Actual velocity vehicle is mostly80driving under motor-generator 2 (MG2) driving mode, which is consistent with the analysis on the UDDS cycle that60the speed of UDDS is mostly between 30~75 km/h
Summary
With the global energy shortage and the increasingly serious environmental pollution, the popularization and promotion of new energy vehicles become increasingly important [1,2]. The application of two speed transmission improves the motor high efficiency operating range through the optimal shift control and proper parameter matching of the target system [4,5,6,7]. The research on the multi motor configuration and reasonable energy management strategy to improve the vehicle economy has become a trend. Reasonable configuration design, accurate system parameter matching and optimization, energy management strategy should be investigated to achieve better vehicle energy consumption reduction of EV. A planetary gear coupling mechanism based dual motor configuration is proposed, which can obtain high system efficiency improvement through optimized system parameters matching and energy management strategy. The planetary gear based dual motor coupling mechanism is introduced, which can improve the system efficiency, reduce the power waste and energy consumption
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