Motor Speed Control

WARNING: This page is about a different car, the 2012 Infiniti M35h. However, it is still accessible from the selected car via links, so may be relevant.

TCM transmits motor speed control request signal to HPCM to get an aimed motor speed. HPCM transmits motor speed control request signal to traction motor inverter, based on which traction motor inverter controls traction motor.
Motor speed control enables to synchronize input speed, which reduces shift shock and gives smooth shifting.
Downshifting by accelerator pedal depression

Fig 1: Motor Speed Control Characteristics Graph
Courtesy of NISSAN NORTH AMERICA, INC.