Cummins Emission Solutions Inc.

Cummins Ip, Inc.

Cummins Filtration Ip, Inc.

David Samuel Everard

Baohua Qi

Mickey R McDaniel

Edmund P Hodzen

Xi Wei

Carlos Alcides Lana

Daniel D Wilhelm

Xiao Lin

Yuetao Zhang

Zhengming Wang

Guoqiang Li

Jeff Runde

Guoquian Li

Roel Stas

Guoquiang Li

A method includes determining whether a urea refill event is detected, and clearing a quality accumulator value and clearing a latching abort command. The method includes determining whether urea fluid quality check abort conditions are met, and clearing the urea quality accumulator, latching the abort command, and exiting the reductant fluid quality check. In response to the abort conditions not being met, incrementing the urea quality accumulator according to an amount of urea being injected, and comparing the accumulated urea quantity to a low test threshold. The method includes, in response to the accumulated urea quantity being greater than the low test threshold, comparing the accumulated urea quantity to a high test threshold, and in response to the urea quantity being greater than the high test threshold, determining whether the a NOexceedance is observed and clearing a urea quality error in response to the NOexceedance not being observed.

System, method, and apparatus for aftertreatment system monitoring

An exhaust gas treatment system for an internal combustion engine may have a reductant delivery system with a controller that performs period diagnostics to determine whether there is a blockage in the reductant delivery system. The diagnostic procedure may include sampling first and second pressures at first and second operating conditions, respectively, and then comparing the first pressure differential between the first and second pressures with one or more threshold pressure differentials to determine whether system components such as a dosing line and an injector are at least partially blocked. If such a test is not conclusive, it may be repeated at a third and fourth operating conditions to provide a second pressure differential. The offset between the first and second pressure differentials may also be used to help diagnose where a blockage in the system resides.

Apparatus, method, and system for diagnosing reductant delivery performance

According to one embodiment, an apparatus for controlling the heating of diesel exhaust fluid (DEF) in a DEF delivery system includes a temperature comparison module that compares a difference between a sensed ambient air temperature and a sensed DEF tank temperature with a predetermined temperature difference threshold. Additionally, the apparatus includes a DEF heating status module that is configured to generate a DEF heating command according to (i) the sensed ambient air temperature if the difference between the sensed ambient air temperature and sensed DEF tank temperature is less than the predetermined temperature threshold; and (ii) the sensed DEF tank temperature if the difference between the sensed ambient air temperature and sensed DEF tank temperature is more than the predetermined temperature threshold. The apparatus also includes a DEF heating control module that is configured to control the heating of the DEF according to the DEF heating command.

Apparatus, system, and method for diesel exhaust fluid heating control

An apparatus for determining a deterioration of a NOsensor response rate in an internal combustion engine system includes an engine control module configured to stop fueling to an internal combustion engine during motoring of the internal combustion engine. The apparatus also includes a signal monitoring module configured to monitor a NOsensor signal after the engine control module stops fueling to the internal combustion engine during motoring of the engine and store NOsensor signal data corresponding to the monitored NOsensor signal. Additionally, the apparatus includes a time constant module that is configured to determine a time constant of the NOsensor response after the engine control module stops fueling. The apparatus further includes a response rate deterioration module configured to determine a response rate deterioration value of the NOsensor based at least partially on the determined time constant.

Apparatus, system, and method for estimating deterioration of a NOx sensor response rate

Systems and methods for monitoring catalyst presence, reverse and damage in an aftertreatment device. The disclosed systems and methods involve calculating the heat capacity of the catalyst device based on information received from sensors for measuring temperatures at the inlet and outlet of the SCR device and the exhaust mass flow.

Systems and methods for monitoring catalyst device integrity

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Columbus, IN, United States of America

David Samuel Everard