REAL-TIME MONITORING OF AUTOMATIC TRANSMISSION FLUID CONDITION

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 te...

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Bibliographische Detailangaben
Hauptverfasser:	SHTAIDA VICTOR E, ZOU LIAN Q, SCHACHAMEYER STEVEN R, HIRTHE RICHARD W
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING ENGINEERING ELEMENTS AND UNITS GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LIGHTING MEASURING MECHANICAL ENGINEERING PHYSICS TESTING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	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 (DeltaOX) and HPDSC induction time per ASTM D-5483 (MIN) determined from a lookup table of values of TAN, DeltaOX and MIN versus impedance differential for known fluid conditions. The remaining useful life (RUL) may then be computed from determined present value of TAN, DeltaOX or MIN. When the temperature corrected impedance difference DeltaZTC reaches 6.5 x 105 Ohms, the ATF is considered to have reached the end of its useful life.