Leakage detecting device for an airtight vessel

Details Leakage detecting device for an airtight vessel Leakage detecting device for an airtight vessel

1993-05-26

1994-07-12

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

731181, G01M 332

Patent

active

053277767

ABSTRACT:
A leakage detecting device for an evaporated fuel gas system of an automobile draws and maintains a partial vacuum in the air space above the fuel in a tank 1 by temporarily connecting the space to the negatively pressurized intake manifold 5. An oxygen sensor 21 thereafter monitors the oxygen level in the evacuated space for a predetermined period of time, and if the oxygen increase exceeds a predetermined normal increase, a leakage alarm is given.

REFERENCES:
patent: 5146902 (1992-09-01), Cook et al.
patent: 5251477 (1993-10-01), Nakashima et al.
Technical Support Document, Jul. 26, 1991, pp. 12-15, State of California Air Resources Board.

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