Method and apparatus for controlling a multi-mode powertrain system

摘要

A method for operating a powertrain system to transfer torque among an engine, torque machines, and a driveline in response to an output torque request includes executing a selection scheme to evaluate operating in a plurality of candidate powertrain states including a pseudo-electric vehicle (EV) range responsive to the output torque request. A respective minimum cost for operating the powertrain system in each of the candidate powertrain states including the pseudo-EV range is determined. A preferred powertrain state is selected, and is one of the candidate powertrain states including the pseudo-EV range associated with a minimum of the respective minimum costs. The powertrain system is controlled in the preferred powertrain state responsive to the output torque request.

主权项

1. A method for operating a powertrain system including a multi-mode transmission configured to transfer torque among an engine, torque machines, and a driveline, comprising:
in response to an output torque request:
executing a selection scheme to evaluate operating the powertrain system in a plurality of candidate powertrain states including in a pseudo-electric vehicle (pseudo-EV) range responsive to the output torque request, the pseudo-EV range comprising generating positive tractive torque to effect vehicle acceleration with the engine operating in a fuel cutoff state with the engine spinning;determining a respective minimum cost for operating the powertrain system in each of the candidate powertrain states including the pseudo-EV range;selecting a preferred powertrain state comprising one of the candidate powertrain states including the pseudo-EV range associated with a minimum of the respective minimum costs; andcontrolling the powertrain system in the preferred powertrain state responsive to the output torque request and operating the powertrain system in the preferred powertrain state.