Controlling torque of a vehicle traction motor

摘要

A hybrid electric automotive powertrain includes an electric machine operable in propulsive and regenerative modes. The machine has positive and negative torque limits for the propulsive and regenerative modes, respectively, to reduce potential thermal damage to the machine due to overheating. The negative and positive torque limits are reduced independently as a temperature of the machine increases. The negative torque limit may be reduced at a greater rate than the positive torque limit.

主权项

1. A method of controlling torque of a vehicle traction motor with positive and negative torque limits, comprising:
when a motor temperature is in a predetermined range, operating the motor using a reduced negative torque limit and a full positive torque limit.