Motor Speed Control

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.

Fig 1: Motor Speed Control (Downshifting By Accelerator Pedal Depression)
Courtesy of NISSAN NORTH AMERICA, INC.