Differential pressure signaling device and method employing...

Details Differential pressure signaling device and method employing... Differential pressure signaling device and method employing...

2005-04-12

2005-04-12

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Fluid pressure gauge

Diaphragm

C361S283100

Reexamination Certificate

active

06877381

ABSTRACT:
A device and method for signaling differential pressure change occurring during leak testing of an evaporative emission control space in a motor vehicle fuel system. A casing has sensing ports one of which is communicated to a reference pressure, such as atmospheric pressure, and another of which is communicated to sense pressure in the evaporative emission control space. As difference between the reference pressure and the pressure in the control space changes, the net magnetic flux acting on a magnetoresistive sensor changes. The sensor is electrically connected to the vehicle electrical system for signaling the differential pressure. The device may be used for both positive and negative pressure leak testing.

REFERENCES:
patent: 3077176 (1963-02-01), Pall et al.
patent: 4283706 (1981-08-01), Kimura et al.
patent: 4292484 (1981-09-01), Pruss
patent: 4371762 (1983-02-01), Diamond
patent: 4793277 (1988-12-01), Haas et al.
patent: 5144102 (1992-09-01), Buse

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