Adaptive shift pressure characterization of an...

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F - Mech Eng,Light,Heat,Weapons

16

H

F16H 61/06 (2006.01) F16H 61/30 (2006.01) F16H 61/00 (2006.01) F16H 61/684 (2006.01)

Patent

CA 2066340

G-8161 C-4319 ADAPTIVE SHIFT PRESSURE CHARACTERIZATION OF AN ELECTRONICALLY CONTROLLED AUTOMATIC TRANSMISSION Abstract of the Disclosure An adaptive pressure control for an automotive transmission in which the fluid pressure developed by an electro-hydraulic actuator is directed to a plurality of fluid operated torque establishing devices, wherein adaptive pressure corrections occasioned by actuator variability do not impair shift quality in operating regions known to be substantially free of actuator variability. Separate adaptive correction amounts are provided for each torque establishing device, and the amounts are compared to determine the portion, if any, occasioned by actuator variability. Such portion is utilized as a correction to an open-loop scheduled pressure to a degree which depends on the magnitude of the scheduled pressure.

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