Adaptive automated transmission downshift control

Details Adaptive automated transmission downshift control Adaptive automated transmission downshift control

1999-07-19

2000-11-14

Marmor, Charles A

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477 78, 74335, F16H 6104, F16H 5900, B60K 4102

Patent

active

061463108

ABSTRACT:
A method/system for controlling downshifting in an automated mechanical transmission system (10) utilized on a vehicle. When a downshift from a currently engaged ratio (GR) is required (ES<ES.sub.D/S), skip downshifts (GR.sub.TARGET =GR-N, N>1) and then single downshifts (GR.sub.TARGET =GR-1) are evaluated in sequence. If throttle demand is high (THL>REF), skip downshifts are evaluated to determine if they can be completed at no greater than a reference value (ES.sub.DES =ES.sub.DES-DEFAULT +offset), which is higher than otherwise (ES=ES.sub.DES-DEFAULT) allowed.

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