Patent · US Active

Method and apparatus for monitoring fuel cells

US7564248B2 · kind B2 · utility

4Cited by

2References

20Claims

0Family size

Assignee

GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

Richard M. Breese · Los Angeles, US
Thomas P. O'Meara · Santa Monica, US
Stanley K. Fujii · Torrance, US
Bernd Peter Elgas · Gau-Algesheim, DE
Stephen Raiser · Egelsbach, DE

Key dates

Filing date	Mar 12, 2007
Grant date	Jul 21, 2009
Priority date	—
Expiry date	Sep 28, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T90/40
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Methods and apparatus are provided for monitoring a coolant conductivity of a fuel cell supplying power via positive and negative buses. The method includes measuring a first voltage of the positive bus, measuring a second voltage of the negative bus, applying a resistance between the positive bus and a reference potential, measuring a third voltage of the positive bus after a period of applying the resistance, and determining an isolation resistance based on the measured voltages. The isolation resistance is a function of the coolant conductivity.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.