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:
Jun. 07, 2011
Filed:
Feb. 06, 2008
Sriram Ganapathy, Rochester, NY (US);
David A. Arthur, Honeoye Falls, NY (US);
Manish Sinha, Pittsford, NY (US);
John P. Salvador, Penfield, NY (US);
David R. Savage, Rochester, NY (US);
Frank X. Leo, Honeoye Falls, NY (US);
Sriram Ganapathy, Rochester, NY (US);
David A. Arthur, Honeoye Falls, NY (US);
Manish Sinha, Pittsford, NY (US);
John P. Salvador, Penfield, NY (US);
David R. Savage, Rochester, NY (US);
Frank X. Leo, Honeoye Falls, NY (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A system and method for limiting the output current of a fuel cell stack as the stack degrades overtime. A look-up table identifies a predetermined voltage set-point for stack current density. A first comparator provides a voltage difference signal between the set-point and the stack voltage. The voltage difference signal is provided to a controller, such as a proportional-integral controller, that provides a current limiting signal. The current limiting signal and a current request signal are provided to a second comparator that selects which signal will be used to limit the maximum output current of the stack. A polarization curve estimator estimates parameters of the stack that will change over the life of the stack. The parameters are provided to a gain scheduler that provides gains to the controller that are based on where in the life of the stack it is currently operating.