Real-time monitoring of automatic transmission fluid condition

Details Real-time monitoring of automatic transmission fluid condition Real-time monitoring of automatic transmission fluid condition

G - Physics

01

N

G01N 27/02 (2006.01) G01M 17/00 (2006.01) G01N 27/26 (2006.01) G01N 33/28 (2006.01) G01R 27/22 (2006.01)

Patent

CA 2509903

A tubular probe having annularly spaced electrodes is immersed in ATF and sequentially excited with an alternating voltage at a relatively high and low frequency. The current is measured at both frequencies and the difference in impedance computed; and, the differential impedance is corrected for temperature and the corresponding value of one of TAN per ASTM D-669, Delta Oxidation per ASTME-168 (.DELTA.OX) and HPDSC induction time per ASTM D-5483 (MIN) determined from a lookup table of values of TAN, .DELTA.OX and MIN versus impedance differential for known fluid conditions. The remaining useful life (RUL) may then be computed from determined present value of TAN, .DELTA.OX or MIN. When the temperature corrected impedance difference .DELTA.ZTC reaches 6.5 x 105 Ohms, the ATF is considered to have reached the end of its useful life.

L'invention concerne une sonde tubulaire comprenant des électrodes espacées, de manière circulaire, immergée dans un fluide pour transmission automatique (ATF) et séquentiellement excitée à l'aide d'une tension alternative à des fréquences relativement haute et basse. On mesure le courant aux deux fréquences, on calcule la différence d'impédance, et on corrige l'impédance différentielle pour une température et la valeur correspondante d'un indice d'acidité totale (TAN) par ASTM D-669, une oxydation delta par ASTME-168 (?.DELTA.OX) et un temps d'induction HPDSC par ASTM D-5483 (MIN) déterminé à partir d'une table de consultation de valeurs de TAN, OX et MIN par rapport au différentiel d'impédance d'états fluidiques connus. La durée de vie utile restante (RUL) peut ensuite être calculée à partir d'une valeur prédéterminée présente de TAN, OX ou MIN. Lorsque la différence d'impédance corrigée de température ZTC atteint 6,5 x 105 Ohms, on considère que ATF a atteint la fin de sa durée de vie utile.¿

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