Pulsed electric machine control using tables
AssigneeTula eTechnology, Inc.
InventorsLouis J. SERRANO, Paul CARVELL, Adya S. TRIPATHI
Life of this patent
Estimating the term…
Abstract
A variety of methods, controllers and electric machine systems are described for pulse control of electric machines (e.g., electric motors and generators). To improve the energy conversion efficiency of the machine, pulse control involves determining if the machine should operate in a continuous mode or pulse mode, and if the latter, defining a magnitude, duty cycle, and frequency for the pulses. One or more tables, indexing by a wide range of speeds and torque requests, is/are used to define the pulsing frequency or a pulsing frequency pattern.
Claims29
An electric machine controller for controlling pulsing of an electric machine onboard a vehicle, the electric machine controller arranged to:
- ascertain a quantity proportional to or a function of the electric machine rotational speed;
- ascertain a torque request;
- obtain a frequency from a table by indexing the table using the quantity proportional to or a function of the electric machine rotational speed and the torque request;
- and
- control pulsed operation of the electric machine by pulsing the electric machine on and off using the frequency obtained from the table.
A method of pulse controlling an electric machine used to propel a vehicle by pulsing the electric machine at a frequency obtained from a table that is indexed using a combination of a speed value and a requested torque.
An apparatus comprising an electric machine and a pulse controller arranged to control pulse operation of the electric machine by pulsing the electric machine at a frequency obtained from a table that is indexed based on a combination of a speed value and a requested torque.
Dependencies are inferred from the claim text.