# US 8,783,030 B2 · System for controlling an air handling system including an electric pump-assisted turbocharger compressor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,030 B2 - Document ID: US8783030B2 - Status: Granted - Kind: B2 - Application number: 13/244,552 - Filed: 2011-09-25 - Published: 2013-03-28 - Granted: 2014-07-22 - Earliest claimed: 2011-09-25 - Assignees: Cummins Inc. - Applicants: John N Chi; John M Mulloy; Sriram S Popuri; Timothy R Frazier; Martin T Books; Divakar Rajamohan; Indranil Brahma - Inventors: John N Chi; John M Mulloy; Sriram S Popuri; Timothy R Frazier; Martin T Books; Divakar Rajamohan; Indranil Brahma - Web page: https://patentgrep.com/patent/US8783030B2 ## CPC - F02B 33/44: Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs - F02B 37/04: Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump - F02B 37/16: by bypassing charging air - F02B 37/18: by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} - F02B 37/24: by using pumps or turbines with adjustable guide vanes - F02B 39/10: electric - F02D 23/00: Controlling engines characterised by their being supercharged - F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)} - F02D 41/0065: {Specific aspects of external EGR control (constructional details of EGR system F02M26/00)} - F02D 2041/1433: {using a model or simulation of the system} - F02D 2200/101: Engine speed - F02M 26/05: High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor - F02M 26/10: having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system - F02M 26/23: Layout, e.g. schematics - F02M 26/47: the characteristics being temperatures, pressures or flow rates - Y02T 10/12: Improving ICE efficiencies - Y02T 10/40: Engine management systems - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract 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 and a compressor having a fresh air inlet fluidly coupled to ambient and to an air outlet of an electric air pump. An air pump enable value as determined a function of target engine speed and total fuel target values and an air flow target is determined as a function of a target fresh air flow value. Operation of the electric air pump is activated 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. ## Claims ### Claim 1 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, an electric air pump fluidly coupled to a fresh air inlet of the compressor, and 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, 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 closing the first air intake valve, opening the second air intake valve, and opening third air intake valves when operation of the electric air pump is activated. ### Claim 2 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. ### Claim 3 (depends on 2) The method of controlling the air handling system of claim 2, wherein the air handling system further comprises 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, and wherein the method further comprises opening the first air intake valve and closing the second and third air intake valves when operation of the electric air pump is disabled. ### Claim 4 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. ### Claim 5 (depends on 4) The method of controlling the air handling system of claim 4, further comprising: determining an air pump outlet pressure corresponding to a pressure of air supplied by the air pump, and determining an air pump outlet temperature corresponding to a temperature of air supplied by the air pump, and wherein determining the target turbine speed and the target compressor torque comprises determining the target turbine speed and the target compressor torque using the air pump outlet temperature as the compressor inlet temperature and using the air pump outlet pressure as the compressor inlet pressure when the operation of the air pump is enabled and the air pump is operating. ### Claim 6 (depends on 5) The method of controlling the air handling system of claim 5, further comprising: determining ambient temperature, and determining ambient pressure, wherein determining the air pump outlet pressure comprises determining the air pump outlet pressure as a function of the ambient temperature, the ambient pressure and the air flow target, and wherein determining the air pump outlet temperature comprises determining the air pump outlet temperature as a function of the ambient temperature, the ambient pressure and the air flow target. ### Claim 7 (depends on 5) The method of controlling the air handling system of claim 5, further comprising: determining ambient temperature, and determining ambient pressure, wherein determining the target turbine speed and the target compressor torque comprises determining the target turbine speed and the target compressor torque using the ambient pressure as the compressor inlet pressure and the ambient temperature as the compressor inlet temperature if operation of the electric air pump is otherwise disabled and non-operational. ### Claim 8 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. ### Claim 9 (depends on 8) The method of controlling the air handling system of claim 8, wherein the air handling system further includes an exhaust gas recirculation (EGR) fluid passageway fluidly coupled between the exhaust manifold and the intake manifold, and wherein the method further comprises determining 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. ### Claim 10 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. ### Claim 11 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. ### Claim 12 (depends on 11) The air handling system of claim 11 further comprising: 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 open the first air intake valve and close the second and third air intake valves when operation of the electric air pump is disabled to direct fresh air from ambient into the first fluid passageway, through the first air intake valve and to the fresh air inlet of the compressor. ### Claim 13 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. ### Claim 14 (depends on 13) The air handling system of claim 13 wherein the instructions stored in the memory further include instructions that are executable by the control circuit to determine when operation of the air pump is activated an air pump outlet pressure corresponding to a pressure of air supplied by the air pump and an air pump outlet temperature corresponding to a temperature of air supplied by the air pump, and to determine the target turbine speed and the target compressor torque using the air pump outlet temperature as the compressor inlet temperature and using the air pump outlet pressure as the compressor inlet pressure when the operation of the air pump is activated and the air pump is operating. ### Claim 15 (depends on 14) The air handling system of claim 14 further comprising: means for determining ambient temperature, and means for determining ambient pressure, wherein the instructions stored in the memory further include instructions that are executable by the control circuit to determine the air pump outlet pressure and the air pump outlet temperature each as a function of ambient pressure, the air flow target, and ambient temperature. ### Claim 16 (depends on 14) The air handling system of claim 14 further comprising: means for determining ambient temperature, and means for determining ambient pressure, wherein the instructions stored in the memory further include instructions that are executable by the control circuit to determine the target turbine speed and the target compressor torque using the ambient pressure as the compressor inlet pressure and the ambient temperature as the compressor inlet temperature if operation of the electric air pump is otherwise disabled and non-operational. ### Claim 17 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. ### Claim 18 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.