Adaptive automated transmission downshift control

摘要

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 < ESD/S), skip downshifts (GRTARGET = GR - N, N > 1) and then single downshifts (GRTARGET = 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 a post shift engine speed not greater than a reference value (ESDES = ESDES - DEFAULT + offset), which is higher than otherwise (ES = ESDES - DEFAULT) allowed.