Cummins Emission Solutions Inc.

Farshad Farid

Jinqian Gong

Ken Hummel

Tyler Kent Lorenz

Atul S Abhyankar

Justin Kruer

Rafael Nunez

Arun Shori Sundaravel

Varun R Rajagopal

Changsheng C Su

Sergio Manuel Hernandez-Gonzalez

Bryon D Staebler

Kwadwo O Owusu

Gautam Sharma

Abhijeet Nande

Deepak Joy Frank

James Hyungsuk Kang

Jaya Chandra-Ramadugu

Joshua Supplee

Andrew Hillery

A vehicle system () includes a conversion catalyst (), a temperature sensor (), an indication device (), and an exhaust gas aftertreatment system controller (). The conversion catalyst () is configured to receive exhaust gas. The temperature sensor () is configured to sense a conversion catalyst temperature of the conversion catalyst (). The indication device () is operable between a static state and an impure fuel alarm state. The exhaust gas aftertreatment system controller () is configured to receive the conversion catalyst temperature from the temperature sensor (). The exhaust gas aftertreatment system controller () is also configured to compare the conversion catalyst temperature to a conversion catalyst temperature lower threshold. The exhaust gas aftertreatment system controller () is also configured to compare the conversion catalyst temperature to a conversion catalyst temperature upper threshold.

Fuel analysis systems and methods

A system for diagnosing an improper reductant concentration includes: a selective catalytic reduction (SCR) catalyst unit, a doser configured to dose reductant into a chamber of the SCR catalyst unit, a reductant concentration sensor, and a controller. In some embodiments, the controller is configured to: direct the doser to dose the reductant into the chamber of the SCR catalyst unit, based on information received from the reductant concentration sensor, determine a reductant concentration level in the chamber of the SCR catalyst unit, compare a measured system-out NOvalue to at least one benchmark value corresponding to the determined reductant concentration level, and determine a status of the reductant dosed by the doser based on the comparison of the measured system-out NOvalue to the at least one benchmark value.

Reductant concentration diagnostic systems and methods

An aftertreatment system comprises a SCR system, an engine out NOx (EONOx) adjustment system and a controller. The controller is configured to instruct the EONOx adjustment system to adjust an EONOx amount between a high EONOx level for a first predetermined time and a low EONOx level for a second predetermined time when the SCR system is in a diagnostic enabling condition. The controller determines a SCR system out NOx (SONOx) amount. The controller determines an efficiency parameter of the SCR system from the SONOx amount when the EONOx amount transitions from the low EONOx level to the high EONOx level and if the efficiency parameter satisfies a predetermined threshold. In response to the efficiency parameter not satisfying the predetermined threshold, the controller determines that the SCR system has failed.

Systems and methods for diagnosing selective catalytic reduction systems

An aftertreatment system comprises an exhaust reductant storage tank and a SCR system including a catalyst fluidly coupled thereto. The aftertreatment system also includes a controller configured to interpret an output signal indicative of a catalytic efficiency of the catalyst. The output signal is filtered using a fast filter to obtain a fast filter response signal, and also using a slow filter to obtain a slow filter response signal. It is determined if the fast filter response signal exceeds a first threshold and if the slow filter response signal exceeds a second threshold. In response to determining that the fast filter response signal exceeds the first threshold, and the slow filter signal response exceeds the second threshold, an indication is provided that an improper exhaust reductant is present in the storage tank.

Detection of an improper reductant in a storage tank

Systems and methods to selectively control plurality of dosing modules may include receiving data indicative of an exhaust flow rate. An amount of reductant to be dosed may be determined based, at least in part, on the data indicative of the exhaust flow rate. A decomposition delay time may also be determined and a first dosing module and a second dosing module may be selectively activated. The first dosing module may be selectively activated at a first time and the second dosing module is selectively activated at a second time. The second time is based on the first time and the determined decomposition delay time.

Selective dosing module control system

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Cranberry Township, PA, United States of America

Farshad Farid