Pulsed electric machine control
AssigneeTula eTechnology, Inc.
InventorVijay Srinivasan
Life of this patent
Estimating the term…
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.
Claims21
An electric machine controller for controlling pulsing of an electric machine onboard a vehicle, the electric machine controller arranged to:
- determine a torque demand for operating the electric machine;
- determine an amplitude for pulsed operation of the electric machine;
- determine a duty cycle for the pulsed operation of the electric machine;
- and
- determine a pulsing frequency for the pulsed operation of the electric machine, wherein the vehicle includes a gearbox and the pulsing frequency is determined based at least in part on a current operational gear of the gearbox the;
- and
- direct pulsed operation of the electric machine at the determined amplitude, duty cycle and pulsing frequency to deliver the torque demand.
An electric machine controller for controlling pulsing of an electric machine onboard a vehicle, the electric machine controller arranged to:
- determine a torque demand for operating the electric machine;
- determine an amplitude for pulsed operation of the electric machine;
- determine a duty cycle for the pulsed operation of the electric machine;
- and
- determine a pulsing frequency for the pulsed operation of the electric machine, wherein the pulsing frequency is determined at least in part based on a wheel-drive status of the vehicle;
- and
- direct pulsed operation of the electric machine at the determined amplitude, duty cycle and pulsing frequency to deliver the torque demand.
An electric machine controller for controlling pulsing of an electric machine onboard a vehicle, the electric machine controller arranged to:
- determine a torque demand for operating the electric machine;
- determine an amplitude for pulsed operation of the electric machine;
- determine a duty cycle for the pulsed operation of the electric machine;
- and
- determine a pulsing frequency for the pulsed operation of the electric machine, wherein the pulsing frequency is determined at least in part based on a weight of a load carried by the vehicle;
- and
- direct pulsed operation of the electric machine at the determined amplitude, duty cycle and pulsing frequency to deliver the torque demand.
An electric machine controller for controlling pulsing of an electric machine onboard a vehicle, the electric machine controller arranged to:
- determine a torque demand for operating the electric machine;
- determine an amplitude for pulsed operation of the electric machine;
- determine a duty cycle for the pulsed operation of the electric machine;
- and
- determine a pulsing frequency for the pulsed operation of the electric machine;
- and
- direct pulsed operation of the electric machine at the determined amplitude, duty cycle and pulsing frequency to deliver the torque demand;
- and
- wherein the pulsing frequency is selected based at least in part on at least one selected from the group consisting of:
- (a) an operating gear of a gearbox;
- (b) a wheel drive status;
- (c) a weight of a load carried by the vehicle;
- (d) a selectable economy mode;
- (e) a selectable sport mode:
- (f) a selectable NVH controller that allows the driver to select different levels of acceptable NVH;
- (g) a determination of whether the vehicle is occupied or not occupied;
- (h) a sensed temperature;
- (i) a first model that models NVH characteristics of the vehicle as the vehicle ages;
- (j) a second model that models NVH characteristics of the vehicle following a cold start of the vehicle;
- (k) an operational status of an active noise control system;
- (l) an operational status of an active vibration control system;
- (m) a road surface conditions;
- or
- (n) any combination of (a) through (m).
An electric machine controller for controlling pulsing of an electric machine onboard a vehicle, the electric machine controller arranged to:
- determine a torque demand for operating the electric machine;
- determine an amplitude for pulsed operation of the electric machine;
- determine a duty cycle for the pulsed operation of the electric machine;
- and
- determine a pulsing frequency for the pulsed operation of the electric machine, wherein the pulsing frequency is determined at least in part based on an operating mode of the vehicle;
- and
- direct pulsed operation of the electric machine at the determined amplitude, duty cycle and pulsing frequency to deliver the torque demand.
Dependencies are inferred from the claim text.