Abstract
As a vital vehicle part, the powertrain system is undergoing a fast transition towards electrification. The new integrated electric drive system has been widely used, especially for passenger cars. In this work, a novel electric dual motor transmission is proposed for heavy commercial vehicles. The transmission scheme is firstly introduced, which can achieve 9 different operating modes including 5 single motor modes and 4 dual motor modes. Then, the mode shift map with minimum energy consumption is designed based on the motor efficiency map and the proposed energy management strategy. The driving power is appropriately distributed between the two motors in dual motor modes under the condition of minimum power consumption. In addition, a coordinated control strategy is developed for mode shift control without power interruption. The results show that the electric dual motor transmission has advantages in power consumption and power shift ability compared with the conventional single motor automated manual transmission.
Highlights
The powertrain system plays a key role in the transition process of vehicle electrification
In Eqs. (1) and (2), the angular velocity of both electric motor (EM) is dependent on the vehicle speed and the gear ratio of the operating mode, which is defined by the following equation:
The energy consumption and shift performance of the electric dual motor transmission (eDMT) and Automated manual transmission (AMT) are compared through the simulation process
Summary
The powertrain system plays a key role in the transition process of vehicle electrification. The dual motor transmission has the power shift capability by maintaining one EM always in gear in the shifting process It can achieve a better operating efficiency along driving cycles by appropriate torque distribution and high torque utilization of the EM when using two downsized EMs to replace one EM with large power. Liang et al [32, 33] investigated the power shift capability of a dual motor AMT on EVs. The proposed shift control strategy took advantage of the dual motor transmission scheme, which greatly improved shift comfort. The above studies have clarified that dual motor transmission shows great potential in improving energy efficiency and power shift capability They are mainly concentrated on passenger cars.
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