System and method for motor torque control for electric vehicle with transmission

摘要

Disclosed herein is a motor control system and method for a vehicle with a transmission comprising for improving the quality of shifting, by improving precision in shifting control with precise and active motor torque control by calculating a maximum and a minimum motor torque in response to determining a power-on up-shift for increasing a shifting gear and a power-off down-shift for decreasing the shifting gear in shifting of the vehicle.

主权项

1. A motor torque control method for a vehicle with a transmission comprising:
determining, by a controller, a power-on up-shift to increase a shifting gear and a power-off down-shift for decreasing the shifting gear in shifting of the vehicle; determining, by the controller, a target shift time to complete shifting; determining, by the controller, a target angular acceleration of a motor according to the target shift time; calculating, by the controller, a maximum motor torque of the motor to operate in shifting, using the target angular acceleration, in response to determining the power-on up-shift; determining, by the controller, a smaller value of the calculated maximum target torque and a target driving torque of the motor at the beginning of shifting, as motor output torque to be output by the motor in shifting, in response to determining the power-on up-shift; calculating, by the controller, a minimum motor torque of the motor to operate in shifting, using the target angular acceleration, in response to determining the power-off down-shift; and determining, by the controller, a larger value of the calculated minimum target torque and the target driving torque of a motor at the beginning of shifting, as motor output torque to be output by the motor in shifting, in response to determining the power-off down-shift, wherein calculating the maximum motor torque value calculation, further includes:
setting, by the controller, a relational expression of a value obtained by multiplying the inertia moment of the motor and a clutch to be engaged by the angular acceleration of the motor is the same as a value obtained by subtracting the clutch torque of the clutch to be engaged from the motor torque, in power-on up-shift;setting, by the controller, the value obtained by the multiplying as a constant, with the target angular acceleration as the angular acceleration of the motor which is multiplied to the inertial moment of the motor and the clutch to be engaged in the relational expression; anddetermining, by the controller, the value obtained by adding the constant to the clutch torque determined in accordance with the operational profile of the clutch to be engaged, as the maximum torque motor value.