Method of calculating transmission clutch and brake fill time

Details Method of calculating transmission clutch and brake fill time Method of calculating transmission clutch and brake fill time

G - Physics

05

D

354/15

G05D 17/02 (2006.01) F16H 61/06 (2006.01) G05D 16/00 (2006.01) G05D 16/20 (2006.01) F16H 59/68 (2006.01) F16H 59/72 (2006.01) F16H 61/00 (2006.01)

Patent

CA 2024602

The fill time of a clutch in an automatic transmission is determined from empirical data embodied in look-up tables which relate the effects of pump speed and fluid temperature on the fill time. Calculations are made for a baseline clutch and are multiplied by a volume ratio for a particular clutch. The effect of fluid temperature on leakage is tabulated and used with the pump speed to determine the effective pumping speed. The effects of fluid temperature on viscosity and oil flow rate are determined and used to adjust the base fill time for high pumping speeds. The fluid retained in a clutch cavity from a recent application and not fully exhausted is also taken into account.

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