Patent ID: 9139096
Filing Date: 2015-09-22
Classification: B60L,B60W,Y02T

Abstract:
1. A method for controlling a traction motor in a vehicle having a traction motor and a proportional-integral (PI) controller, wherein the PI controller is configured for determining a commanded damping torque of the traction motor as a proportional torque output value and a commanded motor speed of the traction motor as an integrator torque output value, the method comprising: determining a direction of the integrator torque output value; determining a direction of an integrator speed error when the proportional output torque value saturates with respect to a calibrated torque limit; and freezing or holding the integrator torque output value only when the proportional torque output value has saturated with respect to the calibrated torque limit and the direction of the integrator speed error is in the same direction as the integrator torque output value; and allowing the integrator torque output value to wind down or change in a direction that is opposite the direction of the proportional control terms.