Torque converter slip rate based skip power downshift control st

Details Torque converter slip rate based skip power downshift control st Torque converter slip rate based skip power downshift control st

1991-05-09

1993-12-28

Black, Thomas G.

Boots, shoes, and leggings

74866, 74889, 192 0096, 192 0092, G06F 1550, F16D 2104, B60K 4104

Patent

active

052745538

ABSTRACT:
A power downshift control method/system strategy (FIG. 6), based upon sensed torque converter slip (TC slip) is provided for an automated mechanical transmission system (12) including an engine (16), a mechanical transmission (14) and a torque converter (20) drivingly interposed the engine and transmission. At the beginning of a power downshift, the target gear is derived from the TC.sub.-- slip, vehicle deceleration, current gear and operator throttle demand. These four vehicle conditions are parameters of a four dimensional matrix such that increasing values of each parameter promote a greater potential for skip power downshifting.

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SAE Paper No. 881830 presented Nov. 1988. Morscheck, The Eaton Ceemat (Converter Enhanced Electronically Managed Automatic Transmission).
SAE Standard J1922.

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