A Mathematical Model of Multispeed Transmissions in Electric Vehicles in the Presence of Gear Shifting.

Some studies indicate the potential of multispeed transmissions (MSTs) in improving performance of electric vehicles (EVs), which has led to many developments of MSTs in this context. However, comprehensive dynamics analyses have not been reported yet. For this reason, a mathematical model for MSTs in EVs is being developed, as reported in this paper. This model will be beneficial to support the design and control of EV-oriented MSTs. The transient dynamic response of the transmission is of interest in this study. Therefore, backlash, flexibility, and dissipation of the gear mesh and connecting parts between two planetary gear sets are studied, while taking all these items into account. The system topology variations induced upon gear shifting are given due attention. Simulation results are validated with experiments. The results show that the model can provide a realistic dynamic response of the transmission. [ABSTRACT FROM PUBLISHER]