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US 12,654,675 B2Granted
Electric machine speed dependent variable frequency pulsed torque control for electric machine
AssigneeFord Global Technologies, LLC
InventorsChris Wolf, Michael W. Degner, Yue Nie
Life of this patent
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Abstract
Systems and methods for commanding an electric drive system for an electric or hybrid vehicle are described. In one example, the drive system is commanded by a controller that supplies a pulsed torque command that varies in frequency as a function of electric machine speed when a driver of a vehicle requests a constant driver demand torque.
Claims15
A method for operating an electric drive system, comprising:
- generating a pulsed torque request that varies in frequency as a function of electric machine speed in response to a constant driver demand torque request;
- randomly varying a frequency of the pulsed torque request;
- and
- supply an inverter with pulse width modulated signals that are generated from the pulsed torque request with the randomly varied frequency;
- where randomly varying the frequency of the pulsed torque request includes extracting a torque pulse frequency from a probability distribution;
- and
- where in the inverter is electrically coupled to the electric machine.
4 more elements
A system, comprising:
- an electric drive system including an inverter and an electric machine;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to:
- generate a pulsed torque request;
- randomly vary a frequency of the pulsed torque request;
- and
- supply the inverter with pulse width modulated signals that are generated from the pulsed torque request with the randomly varied frequency;
- where randomly varying the frequency of the pulsed torque request includes extracting a torque pulse frequency from a probability distribution.
5 more elements
Dependencies are inferred from the claim text.