Cummins Inc.

Cummins Ip, Inc.

John N Chi

Phanindra V Garimella

John M Mulloy

Sriram S Popuri

Timothy R Frazier

Joan M Wills

Indranil Brahma

Joe V Hill

Martin T Books

Abdul R Ofoli

Weiwen Wang

Divakar Rajamohan

Lisa Farrell

Aleksey Yezerets

Neal W Currier

Andy Osburn

Vivek Anand Sujan

Andrew W Osburn

Thomas Dollmeyer

Larry J Brackney

J Steve Wills

Hasan Mohammed

Xi Wei

Ashwin Vyas

Jennifer W Rumsey

B Jerry Song

Abdoul Karim Abdoul Azizou

A system and method are provided for estimating the operating speed of a turbocharger. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a flow rate value corresponds to a flow rate of air entering the air inlet of the compressor. The operating speed of the turbocharger is estimated as a function of the first pressure value, the second pressure value, the temperature value and the flow rate value.

System and method for estimating turbocharger operating speed

A system and method are provided for estimating an operating parameter of an exhaust manifold of an engine. In the system, a flow value is determined that corresponds to a flow rate of exhaust gas through an EGR conduit fluidly coupled between the exhaust manifold and the intake manifold. The EGR conduit includes an exhaust gas cooler disposed in-line with the EGR conduit and a property of the exhaust gas exiting an exhaust gas outlet of the cooler is measured. The operating parameter of the exhaust manifold is estimated as a function of at least the flow value and the property of the exhaust gas exiting the exhaust gas outlet of the cooler. Illustratively, the operating parameter of the exhaust manifold may be exhaust manifold pressure and/or temperature.

System and method for estimating engine exhaust manifold operating parameters

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.

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

A system controlling an air handling system for an internal combustion engine. An EGR valve in-line with an EGR passageway fluidly coupled between exhaust and intake manifolds of the engine is controllable between fully closed open positions to control a flow rate of exhaust gas through the EGR passageway. A control circuit determines a pump enable value as a function of at least one of a target engine speed and a total fueling target, determines a maximum achievable flow rate of recirculated exhaust gas through the EGR passageway with the EGR valve in the fully open position, and activates an electric gas pump to increase the flow rate of exhaust gas through the EGR passageway if the pump enable value exceeds a threshold pump enable value and a target flow rate of recirculated exhaust gas through the EGR passageway is less than the maximum achievable flow rate.

System for controlling an air handling system including an electric pump-assisted exhaust gas recirculation

A system and method are provided for estimating the flow rate of air entering an air inlet of a turbocharger compressor. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a speed value corresponds to an operating speed of the turbocharger. The flow rate of air entering the air inlet of the turbocharger compressor is illustratively estimated as a function of the first pressure value, the second pressure value, the temperature value and the speed value.

System and method for estimating turbocharger compressor inlet air flow rate

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.

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

An apparatus includes an operating conditions module that interprets a number of compressor operating parameters; a compressor flow module that determines a compressor inlet flow in response to the number of compressor operating parameters; and a fresh air flow module that provides a fresh air flow value in response to the compressor inlet flow. The operating conditions module further interprets a current mass air flow value, and the apparatus further includes a mass air flow sensor trimming module that adjusts a mass air flow sensor drift value in response to the current mass air flow value and the fresh air flow value. The apparatus includes a diagnostics module that determines a mass air flow sensor is failed in response to the current mass air flow value and the fresh air flow value.

Fresh air flow estimation

A system is provided for controlling an air handling system for an internal combustion engine. A dual-stage turbocharger includes a high-pressure compressor and variable geometry turbine combination fluidly coupled to a low-pressure compressor and variable geometry turbine combination. A control circuit includes a memory having instructions stored therein that are executable by the control circuit to determine a target low-pressure compressor ratio, a target high-pressure compressor ratio, a target high-pressure compressor inlet temperature and a target high-pressure compressor inlet pressure as a function of a target outlet pressure of the high-pressure compressor and a temperature, a pressure and a target flow rate of air entering the air inlet of the low-pressure compressor, and to control the geometries of the low-pressure and high-pressure turbines as a function of the target low-pressure compressor ratio the target high-pressure compressor ratio respectively.

System for controlling an air handling system including a dual-stage variable geometry turbocharger

According to one representative embodiment, an apparatus for controlling reductant dosing in an SCR catalyst system having a reductant injection system configured to inject reductant into an exhaust gas stream includes a controller, an actual reductant dosing rate module, and a reductant doser compensation module. The controller is configured to determine a reductant dosing rate command representing a desired reductant dosing rate. The actual reductant dosing rate module is configured to determine a predicted actual reductant dosing rate based at least partially on the reductant dosing rate command. The reductant doser compensation module is configured to determine a modified reductant dosing rate command based at least partially on the predicted actual reductant dosing rate. The reductant injection system injects reductant into the exhaust gas stream at a rate corresponding to the modified reductant dosing rate command.

Apparatus, system, and method for controlling reductant dosing in an SCR catalyst system

A method and system for controlling an exhaust temperature for an internal combustion engine is disclosed. The method and system include determining a range of acceptable charge flows within the internal combustion engine to meet a desired exhaust temperature. The method and system further include controlling the charge flows to fall within the range. Control strategies to utilize the charge flow as a lever to control turbine outlet temperature are disclosed. These strategies utilize the inversion of the cylinder outlet temperature virtual sensor as well as a new turbine outlet temperature virtual sensor to determine the charge flow required to achieve the desired turbine outlet temperature given the current turbine inlet and outlet pressure, SOI, charge pressure, charge temperature, fueling, and engine speed.

Method for controlling turbine outlet temperatures in a diesel engine

Various embodiments of an apparatus, system, and method are disclosed for controlling NOconversion in a selective catalytic reduction (SCR) system. According to one representative embodiment, an apparatus includes a duty cycle factor module and a NOconversion mode selection module. The duty cycle factor module is configured to determine a duty cycle factor of an internal combustion engine where the duty cycle factor represents predicted driving conditions of a vehicle in which the internal combustion engine is housed. The NOconversion mode selection module is configured to command NOconversion in the SCR system according to a first NOconversion mode if the duty cycle factor is within a duty cycle factor range and according to a second NOconversion mode if the duty cycle factor is not within the duty cycle factor range.

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According to one representative embodiment, an apparatus for reducing NOemissions in an engine exhaust gas stream of an engine system having a selective catalytic reduction (SCR) system with an SCR catalyst positioned downstream of a reductant injector includes a NOreduction target module and a reductant module. The NOreduction target module is configured to determine a NOreduction requirement, which includes an amount of NOin the exhaust gas stream to be reduced on the SCR catalyst. The reductant module is configured to determine the amount of reductant added to the exhaust gas stream to achieve the NOreduction requirement. The amount of reductant added to the exhaust gas stream is a function of at least one ammonia storage characteristic of the SCR catalyst, at least one reductant-to-ammonia conversion characteristic, and a conversion capability of an AMOX catalyst in exhaust receiving communication with the SCR catalyst.

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Columbus, IN, United States of America

John N Chi