MOTOR TORQUE MANAGEMENT ASSOCIATED WITH AUDIBLE NOISE FOR A HYBRID POWERTRAIN SYSTEM
First Claim
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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; and
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.
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Abstract
A method for operating a hybrid powertrain system includes monitoring operation of the torque machine, and limiting the motor torque output from the torque machine to a maximum allowable motor torque that is 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.
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Citations
8 Claims
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1. Method for operating a hybrid powertrain system including a torque machine configured to transfer torque to an output member, the method comprising:
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monitoring motor torque output from the torque machine and the motor speed of the torque machine; and 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. - View Dependent Claims (2, 3)
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4. Method for operating a hybrid powertrain system including an internal combustion engine, an electric machine and a hybrid transmission, the hybrid transmission configured to transfer power among the input member and the electric machine and an output member, the method comprising:
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identifying a range of motor speeds of the electric machine associated with an audible noise level above a threshold; commanding a motor torque output from the electric machine responsive to an operator torque request; monitoring the motor speed of the electric machine; determining an audible noise level associated with the motor torque output from the electric machine and the motor speed of the electric machine; time-integrating the audible noise level associated with the motor torque output from the electric machine and the motor speed of the electric machine when the motor speed of the electric machine is within the identified range of motor speeds of the electric machine associated with the audible noise level above the threshold; and controlling electric power flow to the electric machine to limit the motor torque output to a maximum allowable motor torque output associated with a preferred audible noise level at the motor speed of the electric machine when the time-integrated audible noise level associated with the motor speed of the electric machine exceeds a threshold. - View Dependent Claims (5)
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6. Method for operating a hybrid powertrain system including an internal combustion engine, an electric machine and a hybrid transmission, the hybrid transmission configured to transfer power between the input member and the torque machine and an output member, the method comprising:
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identifying a range of motor speeds for the electric machine associated with a noise level above a threshold noise level; commanding a motor torque output from the electric machine responsive to an operator torque request; monitoring motor speed of the electric machine; limiting the motor torque output from the electric machine to a maximum allowable motor torque associated with the threshold noise level when the motor speed of the electric machine is within the range of motor speeds for the electric machine associated with the noise level above the threshold noise level. - View Dependent Claims (7, 8)
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Specification