The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 2009
Filed:
May. 31, 2007
Nitinkumar R. Patel, Cypress, CA (US);
Mohammad N. Anwar, Van Buren Township, MI (US);
Silva Hiti, Redondo Beach, CA (US);
Brian a Welchko, Torrance, CA (US);
Steven E. Schulz, Torrance, CA (US);
Lisa M. Talarico, Farmington Hills, MI (US);
Nitinkumar R. Patel, Cypress, CA (US);
Mohammad N. Anwar, Van Buren Township, MI (US);
Silva Hiti, Redondo Beach, CA (US);
Brian A Welchko, Torrance, CA (US);
Steven E. Schulz, Torrance, CA (US);
Lisa M. Talarico, Farmington Hills, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
Methods and systems for operating a motor coupled to an electrical bus in a vehicle are provided. Selected resonant frequencies of the electrical bus are determined. The selected resonant frequencies include a low resonant frequency and a high resonant frequency. Power is provided to the motor through at least one switch operating at a switching frequency. The switching frequency is controlled as a function of a rate of operation of the motor. The function is characterized by one of a first substantially linear portion having a first slope when the switching frequency is less than or equal to a selected switching frequency and a second substantially linear portion having a second slope if the switching frequency is greater than the selected frequency, the selected switching frequency being greater than the low resonant frequency and a substantially linear portion having a y-intercept being greater than the low resonant frequency.