Rotor position measurement and control
AssigneeFord Global Technologies, LLC
InventorsJohn Proietty, Susan Rebecca Cikanek, Bader M. Badreddine, William Reynolds
Life of this patent
Estimating the term…
Abstract
A vehicle includes a controller configured to deactivate an inverter driving the rotor. The deactivation being responsive to respective speeds for a rotor derived from respective samples from each of a monitoring core and a current control core over a same temporal window being different by a threshold amount. The cores each generate a different number of the samples due to having different chronometric periods and the temporal window being greater than the chronometric periods.
Claims11
A vehicle comprising:
- a traction battery;
- an electric machine powered by the traction battery via an inverter, the electric machine having a rotor;
- a sensor configured to provide a signal indicative of rotational position of the rotor;
- first and second timer modules each receiving sensor signals from the sensor, the first timer module having a first output signal with a first frequency lower than a second frequency of a second output signal from the second timer module;
- and
- a controller coupled to the electric machine, the sensor, and the first and second time modules, the controller including at least a first processing core, a second processing core, and a third processing core, the first processing core configured to determine a first rotor speed based on the first output signal, the second processing core configured to determine a second rotor speed based on the second output signal, the third processing core configured to determine a third rotor speed based on the first output signal and to control the inverter to control the electric machine in response to a difference between the first and second rotor speeds or a difference between the first and third rotor speeds exceeding a corresponding threshold.
A method for controlling an electric machine of a vehicle, comprising:
- receiving rotor position signals from a sensor indicative of rotational position of a rotor of the electric machine;
- inputting the rotor position signals to a first timer module generating a first output signal having a first frequency and a second timer module generating a second output signal having a second frequency different from the first frequency;
- processing the first and second output signals by a controller having at least a first processing core, a second processing core, and a third processing core, wherein the first and second processing cores generate respective first and second rotor speeds based on the first output signal and the third processing core generates a third rotor speed based on the second output signal, wherein the controller controls an inverter coupled to the electric machine based on differences among the first, second, and third rotor speeds.
Dependencies are inferred from the claim text.