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Improving vehicle performance in terms of both torque and power is a strong customer need in both conventional and electric vehicles. In this work, different two speed automatic transmission (AT) concepts are developed to improve the energy efficiency and performance of battery electric two wheelers. Developed transmission systems are simple, compact and cost effective and results in relatively high energy efficiency of an electric motor. The unique shift control strategy ensures motor to operate at higher efficiency zones to minimize the overall energy consumption. Virtual simulations of electric vehicle were carried out for different driving conditions and optimal transmission ratios were determined. Mechanical behaviors such as gear shift characteristics, linear and angular velocities, inertial forces of each components are analyzed by using Multi body dynamics simulation. Forces predicted here are further used for durability studies of these components.

Indian Two-wheeler market is the biggest in the world. In two-wheeler segment, scooters have seen a growth of about 27% year-on-year in 2015 and the trend continues in 2016. This healthy growth is due to their ease of handling and operation. This can be majorly attributed to the use of a Continuously Variable Transmission (CVT). While the CVT does offer considerable comfort to rider due to an absence of manual gear-shifting and clutch operation, it also suffers from the drawback of dragging the engine during deceleration phases, which adversely affects fuel efficiency of scooters with carburetor engine, which are quite common in India. Average Fuel efficiency of scooters is ~ 25% less compared to motor bikes with same engine configuration. Also, vibrations due to the engine drag are noticeable.