Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle diagnosis or maintenance indication
Reexamination Certificate
2008-01-24
2011-11-01
Jayne, Darnell (Department: 3637)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle diagnosis or maintenance indication
C340S457400, C073S053050, C701S051000
Reexamination Certificate
active
08050814
ABSTRACT:
An improved method for predicting the remaining useful life of transmission oil and an apparatus for practicing the same are provided. The method includes: detecting if the transmission has completed a new shift; if yes, determining a total shift count; determining accumulated distance and accumulated time parameters; determining a transmission temperature degradation factor; detecting if the lockup clutch is open and if the transmission is in range; if yes, determining a converter degradation factor; determining a total degradation factor based at least in part upon the transmission temperature degradation factor and converter degradation factor; determining an oil life time limit and oil life distance limit; determining if either the accumulated time parameter is greater than the oil life time limit or the accumulated distance parameter is greater than the oil life distance limit; if yes, activating a service indicator to notify vehicle occupants that transmission oil service is required.
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Caldwell Brett R.
Rains Mark A.
GM Global Technology Operations LLC
Jayne Darnell
Quinn Law Group PLLC
Rodden Joshua
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