Pulsed electric machine control
AssigneeTula eTechnology, Inc.
InventorVijay Srinivasan
Life of this patent
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Abstract
Pulsed control of electric motors, and more particularly, to selectively adjusting one or more of a pulsing frequency, an amplitude of the pulses and/or a duty cycle of the pulses for reducing Noise, Vibration and Harshness (NVH) while maintaining high levels of operating efficiency.
Claims16
An electric machine controller for controlling pulsing of an electric machine onboard a vehicle having a drivetrain that includes a multi-speed gearbox and the electric machine, the electric machine controller being configured to:
- determine a pulsing frequency for pulsed operation of the electric machine to deliver a desired torque, wherein the pulsing frequency is determined based at least in part on a current operational gear of the gearbox;
- and
- direct pulsed operation of the electric machine at the determined pulsing frequency to deliver the desired torque.
An electric machine controller for controlling pulsing of an electric machine onboard a vehicle having more than one available wheel drive state, the electric machine controller being configured to:
- determine a pulsing frequency for pulsed operation of the electric machine to deliver a desired torque, wherein the pulsing frequency is determined based at least in part on a current wheel drive state of the vehicle;
- and
- direct pulsed operation of the electric machine at the determined pulsing frequency to deliver the desired torque, wherein different pulsing frequencies are used for different wheel drive states.
An electric machine controller for controlling pulsing of an electric machine onboard a vehicle having more than one available wheel drive state, the electric machine controller being configured to:
- determine a pulsing frequency for pulsed operation of the electric machine to deliver a desired torque, wherein the pulsing frequency is determined based at least in part on a current wheel drive state of the vehicle;
- and
- direct pulsed operation of the electric machine at the determined pulsing frequency to deliver the desired torque, and
- wherein a first pulsing frequency is used when the vehicle is in a first wheel drive state, and a second pulsing frequency is used when the vehicle is in a second wheel drive state.
An electric machine controller for controlling pulsing of an electric machine onboard a vehicle having a drivetrain that includes the electric machine and a gearbox having an engaged state and a disengaged state, the electric machine controller being configured to:
- determine a pulsing frequency for pulsed operation of the electric machine to deliver a desired torque, wherein the pulsing frequency is determined based at least in part on a current engagement state of the gearbox;
- and
- direct pulsed operation of the electric machine at the determined pulsing frequency to deliver the desired torque.
Dependencies are inferred from the claim text.