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.
Downshifting by accelerator pedal depression

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