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:
May. 01, 2012
Filed:
Aug. 01, 2008
Bruce J. Clingerman, Palmyra, NY (US);
Steven D. Burch, Honeoye Falls, NY (US);
John P. Salvador, Penfield, NY (US);
Manish Sinha, Pittsford, NY (US);
Bruce J. Clingerman, Palmyra, NY (US);
Steven D. Burch, Honeoye Falls, NY (US);
John P. Salvador, Penfield, NY (US);
Manish Sinha, Pittsford, NY (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A process for controlling the length of a purge and the purge rate of a fuel cell stack at system shut-down so as to provide the desired amount of stack humidity. The membrane humidification is measured at system shut-down by a high frequency resistance sensor that detects membrane humidification and provides the measurement to a controller. The controller controls the compressor that provides cathode input air to the fuel cell stack so that the time of the purge and the flow rate of the purge provide a desired membrane humidity for the next start-up.