Patent ID: 8280598
Filing Date: 2012-10-02
Classification: B60L,B60W,Y02T

Abstract:
1. Method for operating a hybrid powertrain system including a torque machine configured to transfer torque to an output member, the method comprising: monitoring motor torque output from the torque machine and the motor speed of the torque machine; limiting the motor torque output from the torque machine to a maximum allowable motor torque associated with an acceptable audible noise level when the motor speed of the torque machine is within a motor speed range associated with objectionable audible noise; determining a state of an audible noise parameter corresponding to the motor torque output from the torque machine and the motor speed of the torque machine; time-integrating the state of the audible noise parameter when the motor speed of the torque machine is within the motor speed range associated with the objectionable audible noise; and wherein limiting the motor torque output from the torque machine to the maximum allowable motor torque associated with the acceptable audible noise level when the motor speed of the torque machine is within the motor speed range associated with objectionable audible noise is effected when the time-integrated audible noise parameter exceeds a threshold.