Pulse width modification to preclude phase coincidental switching
AssigneeFord Global Technologies, LLC
InventorsYue Nie, Christopher Wolf, Michael W. Degner
Life of this patent
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Abstract
A controller, while parameters are indicative of electromagnetic interference exceeding a predetermined value, generates voltage reference vectors or duty cycle commands such that differences between switching times of any two phases of an inverter are always greater than a threshold, and while the parameters are indicative of the electromagnetic interference being less than the predetermined value, generates the voltage reference vectors or duty cycle commands such that the differences are sometimes greater than the threshold and other times less than the threshold.
Claims6
An automotive vehicle comprising:
- an electric machine;
- an inverter electrically connected with the electric machine;
- and one or more controllers programmed to,
- during presence of traffic, generate voltage reference vectors such that differences between switching times of any two phases of the inverter are always greater than a value, and
- during absence of traffic, generate the voltage reference vectors such that the differences are sometimes greater than the value and other times less than the value.
Dependencies are inferred from the claim text.