Abstract: A control system for controlling a powertrain system of a hybrid vehicle includes one or more processors configured to receive a first input signal indicative of one or more operating conditions of the vehicle, wherein the one or more operating conditions include an available battery power of the electric traction motor; determine, in dependence on the first input signal, whether to reserve a first portion of a power capability of the electric traction motor for use in performing an engine start; and output a control signal to the powertrain system to withhold the first portion of the power capability from use in delivering power to a drivetrain of the vehicle in accordance with the determination, and to make available a second portion of the power capability for delivering power to the drivetrain of the vehicle.

Abstract: A hybrid powertrain system is operable in a plurality of powertrain operating modes each having an associated set of powertrain control parameter values. The hybrid powertrain system includes an engine and an electric traction motor. The control system includes one or more controllers collectively configured to determine that the hybrid powertrain system is simultaneously operating in two or more of the plurality of powertrain operating modes; determine, based on a predetermined prioritisation index of the plurality of powertrain operating modes, which of the two or more simultaneously operating powertrain operating modes has a highest priority; and control at least one of the engine and electric traction motor via the one or more controllers based on the set of powertrain control parameter values associated with the highest priority powertrain operating mode.