Cummins Inc.

Ashok Kumar

Krishna Kamasamudram

Neal W Currier

Aleksey Yezerets

Michael Haas

Michael A Smith

Krishna Kamasamudrum

Di Wang

Yadan Tang

Richard J Ancimer

Michael J Cunningham

Timothy P Lutz

C Larry Bruner

Jinyong Luo

Junhui Li

Anand Srinivasan

Saurabh Yashwant Joshi

Tyler A Rash

Prachetas A Kale

The present disclosure generally relates to systems and methods for fuel cell regeneration after degradation.

Fuel cell regeneration

A system includes a controller configured to perform an enable operation responsive to receiving information indicative of an enable parameter, the enable operation includes: determining a predicted downstream NOx value of an exhaust gas stream exiting a NOx storage catalyst; determining a downstream NOx value of the exhaust gas stream exiting the NOx storage catalyst; determining an error between the predicted downstream NOx value and the determined downstream NOx value; comparing the error to an error threshold; and determining that the NOx storage catalyst is in good health responsive to determining that the error does not exceed the error threshold. The controller is further configured to perform a disable operation responsive to receiving information indicative of a disable parameter, the disable operation causing a deactivation of at least a portion of the controller.

Systems and methods for diagnosis of NOx storage catalyst

Systems, apparatuses, and methods include an upstream exhaust analysis circuit structured to determine a characteristic of an exhaust gas stream entering a nitrous oxide (NOx) storage catalyst; a prediction circuit structured to predict a downstream NOx concentration of an exhaust gas stream exiting the NOx storage catalyst based on a model of a NOx storage capacity or a dynamic response of the NOx storage catalyst; a downstream exhaust analysis circuit structured to determine a downstream NOx concentration of the exhaust gas stream exiting the NOx storage catalyst; and a comparison circuit structured to compare the predicted downstream NOx concentration to the determined downstream NOx concentration, and determine a health of the NOx storage catalyst based on the comparison.

A diagnostic system () is provided and includes a sensor () disposed downstream from an exhaust gas aftertreatment system. Also included in the diagnostic system () is a central diagnostic unit () configured to diagnose a condensation condition associated with the sensor () for mitigating a sensor failure due to water condensation on the sensor (), the central diagnostic unit () performing the diagnosis on the condensation condition based on water storage and release information related to a component of the exhaust gas aftertreatment system. The sensor () is activated based on the water storage and release information.

System and method to mitigate sensor failures due to water condensation

A method of recovering selective catalytic reduction catalysts relates to metal-Zeolite based catalysts. A selective catalytic reduction catalyst service event where a metal-Zeolite based selective catalytic reduction catalyst of an exhaust aftertreatment system may perform below a threshold level of performance is determined. The selective catalytic reduction catalyst then exposed to a recovery fluid selected to facilitate movement of metal ions.

Recovering deactivated metal/zeolite catalysts

An internal combustion engine system includes an engine and an aftertreatment system that is connected to the engine to receive an exhaust flow from the engine. The aftertreatment system includes a contaminant storage catalyst for storing contaminants produced by the engine during cold start and low temperature operating conditions, and a NOreduction catalyst downstream of the storage catalyst for receiving the contaminants released from the storage catalyst when temperature conditions in the exhaust flow and/or NOreduction catalyst are above an effective temperature threshold for NOreduction. A contaminant amount stored on the storage catalyst can be estimated in response to one or more operating parameters to manage a storage capacity of the storage catalyst. A bypass can used to bypass the storage catalyst to preserve storage capacity for a subsequent cold start condition.

System and method for managing contaminant storage in a storage catalyst

A system and method are disclosed for desulfating an oxidation catalyst in an aftertreatment system of a multifuel internal combustion engine. The oxidation catalyst can be desulfated in response to one or more desulfation triggering events. The desulfation process includes providing hydrocarbons from one or all of the multiple fuel sources to an upstream oxidation catalyst. The hydrocarbons react with the exhaust gas within the upstream oxidation catalyst to deplete oxygen in the exhaust flow to thereby reduce the desulfation temperature of the oxidation catalyst while elevating a temperature of the exhaust gas to a desulfation temperature range.

Systems and methods for desulfation of an oxidation catalyst for dual fuel engines

System, apparatus, and methods are disclosed for treating a reduction catalyst that has been exposed to an amount of sulfur. The treating of the reduction catalyst includes providing a fluid stream at a position upstream of the reduction catalyst. The fluid stream includes a temperature and a reductant amount, and the reductant amount includes an amount of urea, ammonia, or hydrocarbons.

System, method, and apparatus for sulfur recovery on an SCR catalyst

Systems, methods, and apparatuses are provided for determining an SCR component sulfur value, determining whether the SCR component sulfur value exceeds a sulfur regeneration threshold and increasing an engine NO amount incident to an SCR catalyst in response to the SCR component sulfur value exceeding the sulfur regeneration threshold.

System, method, and apparatus for improved desulfurization of aftertreatment components

Systems, apparatus and methods are disclosed for reducing the amount of nitrous oxide (NO) produced in a selective catalytic reductant (SCR) catalyst in an exhaust aftertreatment system. The SCR catalysts are arranged to reduce the amount of NO produced during NOreduction while not adversely affecting NOconversion.

Growing community of inventors

Columbus, IN, United States of America

Ashok Kumar