Mode transition shift management

Abstract

Aspects and embodiments of the invention relate to a control system (100), an automatic transmission system (10), a vehicle (1), a method (400), and computer readable instructions, for controlling an automatic transmission (12) of a vehicle (1), comprising: receiving (410) an input signal indicative of a status of a propulsion system (22) of the vehicle (1); obtaining (430) a current wheel torque in dependence on the propulsion system (22) being in transition from an electric mode to a parallel hybrid mode; determining (440) an available wheel torque in one or more gear ratios which are selectable within the automatic transmission (12); determining (450) whether the available wheel torque in the one or more gear ratios exceeds a predefined fraction of the obtained wheel torque; permitting (460) shifting to any of the one or more gear ratios in which the available wheel torque exceeds the predefined fraction of the obtained wheel torque; and inhibiting (470) shifting to any of the one or more gear ratios in which the available wheel torque is less than or equal to the predefined fraction of the obtained wheel torque.

Dependencies are inferred from the claim text.