Software nullification of transducer induced offset errors...

G - Physics – 01 – F

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G01F 25/00 (2006.01) G01F 1/36 (2006.01) G01F 1/40 (2006.01) G01F 1/50 (2006.01) G01F 1/56 (2006.01) G01F 1/704 (2006.01)

Patent

CA 2144813

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.

Le débit d'un fluide dans une canalisation est mesuré en y plaçant une obstruction partielle pour engendrer des variations dans le trajet d'écoulement et, partant, des variations localisées de pression que des transducteurs convertissent en signaux électriques à être traités pour en tirer des valeurs de débit. Pour corriger la dérive des transducteurs, les signaux sont examinés pendant une période où l'on sait que le débit est nul dans la canalisation. La différence entre les signaux en période de débit nul sert à quantifier la dérive des transducteurs. La valeur déterminée est mise dans la mémoire d'un ordinateur et utilisée par la suite lorsque l'écoulement du fluide reprend. Cette invention est destinée particulièrement aux circuits de freinage de trains; elle est utilisée dans les locomotives pour fournir une mesure précise et fiable de l'air acheminé dans la conduite de freinage d'un circuit pneumatique.

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