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:
Jul. 10, 2018
Filed:
May. 26, 2016
Hyundai Motor Company, Seoul, KR;
Hyun Young Pi, Yongin-si, KR;
Kwi Seong Jeong, Yongin-si, KR;
HYUNDAI MOTOR COMPANY, Seoul, KR;
Abstract
A method for diagnosing a state of a fuel cell stack as being contaminated includes measuring an impedance of a fuel cell stack at a predetermined low frequency and a predetermined high frequency, increasing an amount of fuel or oxidizer supplied to the fuel cell stack when the impedance at the predetermined high frequency is lower than a first critical point and the impedance at the predetermined low frequency is higher than a second critical point, remeasuring the impedance of the fuel cell stack at the predetermined low frequency, and determining that the fuel cell stack is contaminated when the impedance at the predetermined low frequency that is measured in the remeasuring step is higher than the second critical point.