Cummins Engine Company, Inc.

Cummins Inc.

Stephen J Charlton

Paul R Miller

Josh S Shao

Long K Hwang

John Franklin Wright

Thomas Dollmeyer

Larry J Brackney

George A Brunemann

Mark N Bays

Chuan He

Thomas A Grana

Salim A Jaliwala

John Carson Wall

Long-Kung Hwang

Daniel D Wilheim

A method includes determining a first NOconversion efficiency (&#x3b7;) value and determining that a diesel exhaust fluid (DEF) level has increased a threshold amount. Further, the method includes determining a second NOconversion &#x3b7; value and comparing the first NOconversion &#x3b7; value and the second NOconversion &#x3b7; value, determining a NOconversion &#x3b7; change in response to comparing, and determining a DEF quality indicator in response to the NOconversion &#x3b7; change.

System, method, and apparatus for determining aftertreatment fluid quality

A system is disclosed for estimating the mass flow of recirculated exhaust gas (EGR) from an exhaust manifold to an intake manifold of an internal combustion engine via an EGR conduit disposed therebetween and a fraction of EGR attributable to a mass of charge flow entering the intake manifold. An engine controller is responsive to current values of various combinations of the engine exhaust temperature (ETE), intake manifold pressure (IMP), differential pressure (&#x394;P) across an EGR valve, and EGR valve position (EGRP) to determine an estimate of EGR mass flow. The controller is further operable to estimate EGR fraction as a function of the estimated EGR mass flow value, mass flow of charge entering the intake manifold, and engine speed.

System and method for estimating EGR mass flow and EGR fraction

An exhaust gas recirculation and control system is provided for an internal combustion engine, wherein a portion of engine exhaust gas flow is recirculated through an EGR duct to engine intake air. The recirculated exhaust gas is pumped through the EGR duct by an EGR compressor driven by a dedicated EGR drive that is independently controllable. Because the EGR drive is independently powered and controlled, the EGR flow rate capacity of the system is not dictated by, or limited, by factors such as engine exhaust flow rate. A controller modulates power delivery to the drive means in response to at least one operating condition parameter in order to achieve a desired EGR flow rate. In order to further optimize efficiency, the EGR compressor is preferably a discrete displacement pump which is controllably drivable in a pulse-capture mode, wherein each intake of the EGR compressor is timed synchronously with exhaust pulses in the exhaust manifold.

EGR delivery and control system using dedicated full authority compressor

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Columbus, IN, United States of America

Stephen J Charlton