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:
Jan. 30, 2018
Filed:
Oct. 13, 2015
Estimating coolant conductivity in a multi-voltage fuel cell system without disconnecting contactors
GM Global Technology Operations Llc, Detroit, MI (US);
Robert S. Foley, Rochester, NY (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A system and method for monitoring the conductivity of a cooling fluid flowing in a fuel cell system on a vehicle including a chassis. The fuel cell system includes a fuel cell stack electrically coupled to a stack bus and a battery electrically coupled to a propulsion bus. The method includes operating the fuel cell system, measuring a first isolation resistance at the first power level, measuring a first stack voltage, and measuring a first battery voltage. The method also includes operating the fuel cell system at a second power level, and measuring a second isolation resistance, measuring a second stack voltage, and measuring a second battery voltage. The method calculates a stack coolant resistance using the first and second isolation resistances, the first and second stack voltages, and the first and second battery voltages, which is then used to calculate the cooling fluid conductivity.