System for controlling an air handling system including an electric motor assisted variable geometry turbocharger

摘要

A system and method are provided for controlling an air handling system for an internal combustion engine including a turbocharger having a variable geometry turbine fluidly coupled to an exhaust manifold of the engine and a compressor fluidly coupled to an intake manifold of the engine, and an electric motor coupled to a rotatable shaft connected between the compressor and the variable geometry turbine. A target torque required to drive the compressor to achieve target compressor operating parameters is determined, a maximum available torque that can be supplied by the variable geometry turbine in response to a target exhaust gas flow through the variable geometry turbine is determined, and the electric motor is enabled to supply supplemental torque to the rotatable shaft if the target torque is greater than the maximum available torque.

主权项

1. An air handling system for an internal combustion engine, comprising:
a turbocharger having a variable geometry turbine fluidly coupled to an exhaust manifold of the engine and a compressor fluidly coupled to an intake manifold of the engine, the variable geometry turbine rotatably connected to the compressor via a rotatable shaft such that the variable geometry turbine rotatably drives the compressor via the rotatable shaft in response to exhaust gas passing through the variable geometry turbine, an electric motor coupled to the rotatable shaft of the turbocharger, and a control circuit having executable instructions stored in a non-transitory memory to:
determine a total target torque required to drive the compressor to achieve target compressor operating parameters;determine a peak available turbine torque being supplied by a variable geometry turbine rack position in response to target exhaust gas conditions;generate a supplemental torque via activating the electric motor on the rotatable shaft of the turbocharger if the total target torque is greater than the peak available turbine torque, wherein the supplemental torque being generated by the electric motor in combining with the peak available turbine torque is to achieve the total target torque; andadjusting at least one of an exhaust gas flow and an exhaust gas recirculation flow via changing the variable geometry turbine rack position.