Cummins Emission Solutions Inc.

Arun Kumar Dasari

Jinqian Gong

Bryce R Larson

Gautam Sharma

Santosh Kumar Ratan

Abhijeet Singh Chauhan

Aditi Vedantam

Frederick V Holt, Iii

Anurag Kumra

An aftertreatment system comprises a selective catalytic reduction (SCR) unit, a reductant injector configured to insert reductant into the aftertreatment system, a first NOsensor configured to measure an amount of NOgases at a location upstream of the reductant injector, and a second NOsensor configured to measure an amount of NOgases at a location downstream of the SCR unit. A controller is programmed to estimate an amount of reductant deposits formed in the aftertreatment system based on at least the amount of NOgases measured at the location upstream of the reductant injector, the amount of NOgases measured at the location downstream of the SCR unit, and an amount of reductant that has been inserted into the aftertreatment system. The controller adjusts an amount of reductant to be inserted into the aftertreatment system based on the estimated amount of reductant deposits formed in the aftertreatment system.

Systems and methods for determining amount of reductant deposits in aftertreatment systems

An exhaust aftertreatment system includes a catalyst, an exhaust conduit system, a first sensor, a second sensor, a reductant pump, a dosing module, and a reductant delivery system controller. The exhaust conduit system is coupled to the catalyst. The first sensor is coupled to the exhaust conduit system upstream of the catalyst and configured to obtain a current first measurement upstream of the catalyst. The second sensor is coupled to the exhaust conduit system downstream of the catalyst and configured to obtain a current second measurement downstream of the catalyst. The reductant pump is configured to draw reductant from a reductant source. The dosing module is fluidly coupled to the reductant pump and configured to selectively provide the reductant from the reductant pump into the exhaust conduit system upstream of the catalyst. The reductant delivery system controller is communicable with the first sensor, the second sensor, the reductant pump, and the dosing module.

Systems and methods for implementing corrections to a reductant delivery system in an exhaust aftertreatment system of an internal combustion engine

An aftertreatment system comprises an aftertreatment component structured to decompose constituents of an exhaust gas produced by an engine. A reductant insertion assembly is fluidly coupled to the aftertreatment component and configured to insert a reductant therein. A controller is operatively coupled to the reductant insertion assembly and configured to instruct the reductant insertion assembly to insert the reductant into the aftertreatment component for a first insertion time between first time intervals. The controller determines an operating condition of the engine, and determines if the operating condition satisfies a predetermined condition. In response to the predetermined condition being satisfied, the controller instructs the reductant insertion assembly to insert the reductant into the aftertreatment component for a second insertion time between second time intervals. The second insertion time is longer than the first insertion time.

Systems and methods for reducing noise in reductant insertion assemblies

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Columbus, IN, United States of America

Arun Kumar Dasari