Measuring and testing – With fluid pressure – Leakage
Reexamination Certificate
2006-10-31
2006-10-31
McCall, Eric S. (Department: 2855)
Measuring and testing
With fluid pressure
Leakage
C429S010000, C429S006000, C073S049700
Reexamination Certificate
active
07127937
ABSTRACT:
A method for detecting leaks in a fuel cell system that includes a hydrogen storage tank, a primary shut-off valve and a secondary shut-off valve in a supply line. At shut-down, the primary shut-off valve is closed and the stack is temporarily left operating. The pressure is measured in the supply line between the valves. When the measured pressure has reached a predetermined shut-down pressure, the secondary shut-off valve is closed. At the next system start-up, the pressure is measured before the shut-off valves are opened, and the measured pressure is compared with the stored pressure. If the current pressure measurement is lower than the stored pressure measurement, it is an indication that the supply line between the shut-off valves or the secondary valve leaks. If the measured pressure is higher than the stored pressure, it is an indication that the primary valve leaks.
REFERENCES:
patent: 6475651 (2002-11-01), Wilkinson et al.
patent: 6511765 (2003-01-01), Ueno et al.
patent: 6638650 (2003-10-01), Bailey et al.
patent: 6662633 (2003-12-01), Pratt
patent: 6815104 (2004-11-01), Uehara et al.
patent: 2002/0017463 (2002-02-01), Merida-Donis
patent: 2003/0110837 (2003-06-01), Pratt
patent: 2003/0124399 (2003-07-01), Amrhein et al.
patent: 2004/0161643 (2004-08-01), Uehara et al.
patent: 2004/0219398 (2004-11-01), Calhoon
patent: 2004/0234829 (2004-11-01), Sederquist et al.
patent: 2005/0214604 (2005-09-01), Goto et al.
patent: 2006/0110640 (2006-05-01), Yoshida et al.
Ellerbrock Charles H.
GM Global Technology Operations Inc.
McCall Eric S.
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