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.
Claims17
A method of pulse controlling an electric machine used on a vehicle by pulsing the electric machine at a pulsing frequency that has been adjusted to take into account Noise, Vibration and Harshness (NVH) that is either caused by one or more components on the vehicle or that allows an adjustment of an amount of the NVH that is acceptable, the pulsing frequency being adjusted based at least in part on one or more of the following:
- (a) a current gearbox status, wherein in a first gear a first pulsing frequency is used and in a second gear a second pulsing frequency is used that is different than the first pulsing frequency;
- (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) an occupancy sensor;
- (h) a temperature sensor;
- a first model that models NVH characteristics of the vehicle as the vehicle ages;
- a second model that models NVH characteristics of the vehicle following a cold start of the vehicle;
- (k) an active noise control system;
- (l) an active vibration control system;
- (m) a road surface conditions;
- or
- (n) any combination of (a) through (m).
A method of controlling an electric machine used on a vehicle comprising pulsing the electric machine at a first frequency when the vehicle is in a first gear so as to avoid a first resonant frequency of the vehicle when operating in the first gear and pulsing the electric machine at a second frequency when the vehicle is in a second gear so as to avoid a second resonant frequency of the vehicle when operating in the second gear.
A method of controlling an electric machine used on a vehicle comprising selecting a pulsing frequency for pulsed operation of the electric machine based at least in part on a wheel drive status of the vehicle selected from a group consisting of a Front Wheel Drive (FWD) status, a Rear Wheel Drive (RWD) status, and an All Wheel Drive (AWD) status of the vehicle.
Dependencies are inferred from the claim text.