Data processing: measuring – calibrating – or testing – Measurement system – Statistical measurement
Reexamination Certificate
2005-07-19
2005-07-19
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Statistical measurement
C702S156000, C073S053050
Reexamination Certificate
active
06920412
ABSTRACT:
The remaining useful life of a transmission fluid in a vehicle is continually estimated by a transmission control computer module during vehicle operation using both an oxidation model and a shift energy model. The oxidation model uses experimentally determined remaining useful fluid life values obtained at temperatures experienced by the fluid in transmission usage and subtracts incremental values from said life based on the temperature-time experience of volume fractions of the fluid in the sump and torque converter. The shift energy model starts with an estimated maximum number of shifts and continually obtains a current remaining useful life by deducting for actual shifts and estimated shift energy inputs based on fluid temperature. Notice of end of fluid useful life is given when one of the models first determines no remaining useful fluid life.
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patent: 4742476 (1988-05-01), Schwartz et al.
patent: 4847768 (1989-07-01), Schwartz et al.
patent: 5777211 (1998-07-01), Binienda et al.
patent: 6327900 (2001-12-01), McDonald et al.
patent: 2004/0117147 (2004-06-01), Hirthe et al.
Calcut Brent D.
Linden James L.
Sarkar Reuben
Barlow John
Cherry Stephen J.
General Motors Corporation
Hodges Leslie C.
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