Cummins Emission Solutions Inc.

Santosh Kumar Ratan

Jinqian Gong

Bryce R Larson

Abhijeet Singh Chauhan

Arun Kumar Dasari

Frederick V Holt, Iii

Aditi Vedantam

James C Clerc

Premjee Sasidharan

Bryon D Staebler

Todd A Corbet

Wei Huang

Marc Alexander Greca

David C Hall

Alain Ngoy Tschimwang

Bradley V Jones

Rohil Daya

Karthik Venkata Rama Krishna Dadi

A controller for controlling operation of an aftertreatment system that is configured to treat constituents of an exhaust gas produced by an engine, the aftertreatment system including a selective catalytic reduction (SCR) catalyst, the controller configured to: generate a short-term cumulative degradation estimate of the SCR catalyst corresponding to reversible degradation of the SCR catalyst due to sulfur and/or hydrocarbons based on a SCR catalyst temperature parameter; generate a long-term cumulative degradation estimate of the SCR catalyst corresponding to thermal aging of the SCR catalyst based on the SCR catalyst temperature parameter; generate a combined degradation estimate of the SCR catalyst based on the short-term cumulative degradation estimate and the long-term cumulative degradation estimate; and adjust an amount of reductant and/or an amount of hydrocarbons inserted into the aftertreatment system based on the combined degradation estimate of the SCR catalyst.

Controller and method for controlling operation of an aftertreatment system based on short-term and long-term cumulative degradation estimates

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

An SCR system may include a controller configured to diagnose errors with a dosing system. The controller may control a pump to compensate for a loss in pressure when dosing reductant and may maintain the pressure as close to a target pressure by modifying a parameter affecting the operation of the pump. The modification of the parameter may be used to determine an estimated flow feedback. The controller may use the estimated flow feedback data and commanded dosing amount data to calculate a percentage error in response to and using an integrated commanded flow and an integrated estimated flow feedback to detect errors of the dosing system. The errors may include an injector stuck closed error, a blocked pressure line error, a partial blockage of a pressure line or injector error, an injector stuck open error, a disconnected pressure line error, a leakage of a pressure line or injector error.

Diagnosing system for reductant dosing system

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Columbus, IN, United States of America

Santosh Kumar Ratan