System for controlling an air handling system including an electric pump-assisted turbocharger compressor

A method of 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, a compressor having a compressor outlet fluidly coupled to an intake manifold of the engine, and an electric air pump fluidly coupled to a fresh air inlet of the compressor, the method of controlling the air handling system comprising:

• determining an air pump enable value as a function of target engine speed and total fuel target values,
• determining an air flow target as a function of a target fresh air flow value,
• activating operation of the electric air pump to supply supplemental air flow to the fresh air inlet of the compressor if the air pump enable value is greater than a threshold air pump enable value and the air flow target does not exceed a maximum flow value, and
• disabling operation of the electric air pump from supplying supplemental air flow to the fresh air inlet of the compressor if at least one of the air pump enable value does not exceed the threshold air pump enable value and the air flow target exceeds the maximum flow value.

A method of 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, a compressor having a compressor outlet fluidly coupled to an intake manifold of the engine, and an electric air pump fluidly coupled to a fresh air inlet of the compressor, the method of controlling the air handling system comprising:

• determining an air pump enable value as a function of target engine speed and total fuel target values,
• determining an air flow target as a function of a target fresh air flow value,
• activating operation of the electric air pump to supply supplemental air flow to the fresh air inlet of the compressor if the air pump enable value is greater than a threshold air pump enable value and the air flow target does not exceed a maximum flow value,
• determining a target turbine speed and a target compressor torque as a function of a target compressor flow rate, a target compressor outlet pressure, a compressor inlet pressure and a compressor inlet temperature,
• determining a target rack setting of the variable geometry turbine as a function of the target turbine speed, the target compressor torque, a target exhaust manifold temperature and a target exhaust manifold pressure, and
• controlling a rack setting of the variable geometry turbine as a function of the target rack setting.

A method of 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, a compressor having a compressor outlet fluidly coupled to an intake manifold of the engine, and an electric air pump fluidly coupled to a fresh air inlet of the compressor, the method of controlling the air handling system comprising:

• determining an air pump enable value as a function of target engine speed and total fuel target values,
• determining an air flow target as a function of a target fresh air flow value,
• activating operation of the electric air pump to supply supplemental air flow to the fresh air inlet of the compressor if the air pump enable value is greater than a threshold air pump enable value and the air flow target does not exceed a maximum flow value,
• conducting an engine and fueling operation check, and
• wherein activating operation of the electric air pump comprises activating operation of the electric air pump if the air pump enable value is greater than a threshold air pump enable value, the air flow target does not exceed a maximum flow value and the engine and fueling operation check passes.

An air handling system for an internal combustion engine, the air handling system comprising:

• a turbocharger having a variable geometry turbine fluidly coupled to an exhaust manifold of the engine and a compressor having a compressor outlet 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 air pump configured to selectively supply supplemental air flow to a fresh air inlet of the compressor when enabled for operation,
• a control circuit including a memory having instructions stored therein that are executable by the control circuit to determine an air pump enable value as a function of at least one of a target engine speed and a total fueling target, to determine an air flow target as a function of a target fresh air flow value, and to activate the electric air pump to supply supplemental air flow to the fresh air inlet of the compressor if the air pump enable value is greater than a threshold air pump enable value and the air flow target does not exceed a maximum flow value,
• a first fluid passageway fluidly coupled between the fresh air inlet of the compressor and ambient,
• a first air intake valve disposed in-line with the first fluid passageway,
• a second fluid passageway fluidly coupled between an air inlet of the electric air pump and the first fluid passageway between the first intake valve and ambient,
• a second air intake valve disposed in-line with the second fluid passageway,
• a third fluid passageway fluidly coupled between an air outlet of the electric air pump and the first fluid passageway between the first intake valve and the fresh air inlet of the compressor, and
• a third air intake valve disposed in-line with the third fluid passageway,
• wherein the instructions stored in the memory further include instructions executable by the processor to close the first air intake valve and open the second and third air intake valves when operation of the electric air pump is activated.

An air handling system for an internal combustion engine, the air handling system comprising:

• a turbocharger having a variable geometry turbine fluidly coupled to an exhaust manifold of the engine and a compressor having a compressor outlet 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 air pump configured to selectively supply supplemental air flow to a fresh air inlet of the compressor when enabled for operation, and
• a control circuit including a memory having instructions stored therein that are executable by the control circuit to determine an air pump enable value as a function of at least one of a target engine speed and a total fueling target, to determine an air flow target as a function of a target fresh air flow value, and to activate the electric air pump to supply supplemental air flow to the fresh air inlet of the compressor if the air pump enable value is greater than a threshold air pump enable value and the air flow target does not exceed a maximum flow value,
• wherein the instructions stored in the memory further include instructions that are executable by the control circuit to disable operation of the electric air pump from supplying supplemental air flow to the fresh air inlet of the compressor if at least one of the air pump enable value does not exceed the threshold air pump enable value and the air flow target exceeds the maximum flow value.

An air handling system for an internal combustion engine, the air handling system comprising:

• a turbocharger having a variable geometry turbine fluidly coupled to an exhaust manifold of the engine and a compressor having a compressor outlet 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 air pump configured to selectively supply supplemental air flow to a fresh air inlet of the compressor when enabled for operation, and
• a control circuit including a memory having instructions stored therein that are executable by the control circuit to determine an air pump enable value as a function of at least one of a target engine speed and a total fueling target, to determine an air flow target as a function of a target fresh air flow value, and to activate the electric air pump to supply supplemental air flow to the fresh air inlet of the compressor if the air pump enable value is greater than a threshold air pump enable value and the air flow target does not exceed a maximum flow value,
• wherein the instructions stored in the memory further include instructions that are executable by the control circuit to determine a target turbine speed and a target compressor torque as a function of a target compressor flow rate, a target compressor outlet pressure, a compressor inlet pressure and a compressor inlet temperature, to determine a target rack setting of the variable geometry turbine as a function of the target turbine speed, the target compressor torque, a target exhaust manifold temperature and a target exhaust manifold pressure, and to control a rack setting of the variable geometry turbine as a function of the target rack setting.

An air handling system for an internal combustion engine, the air handling system comprising:

• a turbocharger having a variable geometry turbine fluidly coupled to an exhaust manifold of the engine and a compressor having a compressor outlet 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 air pump configured to selectively supply supplemental air flow to a fresh air inlet of the compressor when enabled for operation,
• a control circuit including a memory having instructions stored therein that are executable by the control circuit to determine an air pump enable value as a function of at least one of a target engine speed and a total fueling target, to determine an air flow target as a function of a target fresh air flow value, and to activate the electric air pump to supply supplemental air flow to the fresh air inlet of the compressor if the air pump enable value is greater than a threshold air pump enable value and the air flow target does not exceed a maximum flow value,
• wherein the instructions stored in the memory further include instructions that are executable by the control circuit to conduct an engine and fueling operation check and activate the electric air pump if the air pump enable value is greater than a threshold air pump enable value, the air flow target does not exceed a maximum flow value and if the engine and fueling check passes.

An air handling system for an internal combustion engine, the air handling system comprising:

• a turbocharger having a variable geometry turbine fluidly coupled to an exhaust manifold of the engine and a compressor having a compressor outlet 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 air pump configured to selectively supply supplemental air flow to a fresh air inlet of the compressor when enabled for operation,
• a control circuit including a memory having instructions stored therein that are executable by the control circuit to determine an air pump enable value as a function of at least one of a target engine speed and a total fueling target, to determine an air flow target as a function of a target fresh air flow value, and to activate the electric air pump to supply supplemental air flow to the fresh air inlet of the compressor if the air pump enable value is greater than a threshold air pump enable value and the air flow target does not exceed a maximum flow value, and
• an exhaust gas recirculation (EGR) fluid passageway fluidly coupled between the exhaust manifold and the intake manifold,
• wherein the instructions stored in the memory further include instructions that are executable by the control circuit to determine the target exhaust manifold temperature and the target exhaust manifold pressure based on target charge parameters, target engine fueling parameters and a target flow rate of exhaust gas in the EGR fluid passageway.