METHOD AND SYSTEM FOR CONTROLLING TORQUE IN AN ELECTRIC DRIVE POWERTAIN

摘要

This disclosure provides a method of controlling an electric drive powertrain system. The method includes providing an electric motor capable of running between a motor minimum speed and a motor maximum speed such that the electric motor can produce different amounts of torque between a first region defined between the motor minimum speed and a motor base speed and a second region defined between the motor base speed and the motor maximum speed. The method includes receiving a signal from operator inputs and determining a desired transmission output torque based on the signal received from the operator inputs. The method also includes determining a desired motor torque based on the desired transmission output torque, operating the electric motor at a current corresponding to the desired motor torque and producing a greater amount of torque at the motor base speed than at the motor minimum speed.

主权项

1. A method of controlling an electric drive powertrain system of a machine, the machine including an inverter, a transmission having a plurality of selectable gears, and a transmission control unit including a memory unit and a processor, comprising:
providing an electric motor capable of running between a motor minimum speed and a motor maximum speed, the electric motor configured to produce torque between a first region defined between the motor minimum speed and a motor base speed and a second region defined between the motor base speed and the motor maximum speed; receiving a signal from one or more operator control inputs; determining a desired transmission output torque based on the signal received from the one or more operator inputs; determining a desired motor torque based on the desired transmission output torque; while operating the electric motor in the first region, controllably operating the electric motor at a current less than or equal to an amount of current required at a maximum motor torque at motor base speed; and producing a greater amount of torque at the motor base speed than the amount of torque produced at motor minimum speed.