Method of determining the fluid condition of diesel engine...

Details Method of determining the fluid condition of diesel engine... Method of determining the fluid condition of diesel engine...

G - Physics

01

N

G01N 27/02 (2006.01) G01M 15/00 (2006.01) G01N 33/28 (2006.01) G01N 33/30 (2006.01)

Patent

CA 2481598

A probe having a pair of electrodes is excited with a low A.C. voltage at a relatively high and relatively low frequency and the difference in current measured. The difference dZ between bulk fluid and interfacial impedance is computed from the current difference. The rate of change .DELTA.dZ of the impedance difference is determined over a time interval and a physiochemical parameter (X) determined when .DELTA.dZ is positive from lubricant with known amounts of constituents selected from the group consisting of (a) Phosphorus, Oxygen and Carbon (P-O-C); (b) Phosphorous and double bond Sulphur (P = S); (c) Zincdialkyldithiophosphate (ZDDP); and (d) the Total Base Number TBN by measuring CaCO3 (CO3), from a table of the selected parameter X versus dZ in a first region of the table and determining RUL from a table of RUL versus parameter X (X1). The value of the selected parameter X when .DELTA.dZ is negative is determined from a second region of the table of X versus dZ. The rate of change .PSI. of X over a time interval is determined and RUL determined from a known value of X EOL for the end of the lubricant life.

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