Software nullification of transducer induced offset errors withi

Details Software nullification of transducer induced offset errors withi Software nullification of transducer induced offset errors withi

1995-01-23

1996-10-08

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Using differential pressure

305 15, G01F 138

Patent

active

055633536

ABSTRACT:
Fluid flow in a conduit is measured by placing a flow block in the conduit which introduces variations in the flowpath which cause local pressure variations. The pressure variations are converted to electrical signals by transducers, and the electrical signals are processed to obtain flow rate values. To provide a correction for transducer drift, the transducer signals are examined during a time when there is known to be zero flow in the conduit. The difference between the transducer signals during a time when there is zero flow is used as a measure of transducer drift. A value for the drift is stored in computer memory and used subsequently, when fluid flow is resumed. This invention is specifically intended for use in railroad airbrake systems, where it is used in a locomotive to provide an accurate and reliable measurement of air supplied to the brake pipe of the air brake system.

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patent: 4996886 (1991-03-01), Hardin
patent: 5192118 (1993-03-01), Balukin et al.
patent: 5222788 (1993-06-01), Dimsa et al.

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