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. 04, 2015
Filed:
Jun. 28, 2011
David J. Reed, Fairport, NY (US);
Kenneth L. Kaye, Fairport, NY (US);
Derek R. Lebzelter, Fairport, NY (US);
David J. Reed, Fairport, NY (US);
Kenneth L. Kaye, Fairport, NY (US);
Derek R. Lebzelter, Fairport, NY (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method for providing calibration synchronization pulses in a pulse width modulation (PWM) signal including fuel cell voltage measurement pulses. The method includes providing a sequence of voltage signals representative of the voltage of the fuel cells in a fuel cell group, where the sequence of voltage signals are provided in the order of the position of the fuel cells in the group. The method also includes providing a sequence of calibration pulses and combining the sequence of voltage signals and the sequence of calibration pulses so that the calibration pulses are provided before a voltage signal of a first cell in the group. The method modulates the combined sequence of the voltage signals and the calibration pulses using an inverted saw tooth wave to provide the PWM signal, where a width of the pulses representing the voltage signals are proportional to a width of the pulses representing the calibration pulses.