Gm Global Technolgoy Operations, Inc.

Joshua Clifford Bedford

Christopher L Whitt

Thomas LaRose, Jr

Christopher C Swoish

Eugene Victor Gonze

Michael J Paratore, Jr

Giuseppe Mazzara Bologna

Julian C Tan

Min Sun

Rahul Mital

Janean Kowalkowski

Shifang Li

Charles Solbrig

Jianwen Li

Kevin Andrew Gady

Yong Miao

Claudio Ciaravino

Luciano Nunziato Di Perna

Roberto Argolini

Naser I Hineiti

Andrea Arnone

Manuel Angel Gonzalez Delgado

Jean-Yves Lavallee

Steven M Yocum

An after-treatment (AT) system for an exhaust gas flow from an internal combustion engine includes first and second AT devices positioned in the exhaust gas flow. The AT system also includes an exhaust passage for carrying the flow of exhaust gas from the first AT device to the second AT device. The AT system additionally includes an injector configured to generate a reductant spray into the exhaust passage and a sensor positioned proximate the injector for detecting a concentration of a pollutant in the exhaust gas flow downstream of the first AT device. The AT system furthermore includes a deflector arranged between the injector and the sensor and configured to guide the flow of exhaust gas to the sensor to thereby concentrate the flow of exhaust gas at the sensor and direct the reductant spray away from the sensor to thereby minimize detection of the reductant by the sensor.

Reductant spray and exhaust gas flow guide and deflector

An internal combustion engine fluidly coupled to an exhaust aftertreatment system includes a particulate filter device, a first selective catalytic reduction device disposed upstream relative to a second selective catalytic reduction device, and an injection system disposed to inject a reductant into the exhaust gas feedstream upstream relative to the first selective catalytic reduction device. A method for controlling the internal combustion engine includes monitoring engine operation, and determining an amount of particulate matter stored on the particulate filter based thereon. An amount of reductant stored on the second selective catalytic reduction device and operating conditions associated with the exhaust aftertreatment system are also determined. A process to regenerate the particulate filter is executed only when the amount of reductant stored on the second selective catalytic reduction device is greater than a minimum threshold and the operating conditions are conducive to regenerating of the particulate filter.

Method and apparatus for controlling an internal combustion engine coupled to an exhaust aftertreatment system

An internal combustion engine is coupled to an oxidation catalyst disposed upstream of a second catalytic device. A controller includes an instruction set executable to detect a cold start engine starting event, monitor first and second temperature sensors, control each of the fuel injectors to execute a first set of fuel injection events for each cylinder event in response to an output torque request, and execute a second set of fuel injection events for each cylinder event after cylinder top-dead-center. The second set of fuel injection events includes a final injection event, and a duration of the final injection event is determined based upon the first and second temperatures.

Method and apparatus to control fuel injection in an internal combustion engine

An after-treatment (AT) system for a flow of exhaust gas of an internal combustion engine includes a first AT device and a second AT device in fluid communication with and positioned in the exhaust gas flow downstream of the first AT device. The AT system also includes an exhaust passage configured to carry the exhaust gas flow from the first AT device to the second AT device. The AT system additionally includes an injector configured to introduce a reductant into the exhaust passage. The second AT device includes an inlet cone having a volute defining a spiral primary path for the exhaust gas flow into the second AT device and configured to generate a swirling motion of and turbulence in the exhaust gas flow. A vehicle employing the AT system is also disclosed.

Reductant mixing system for an exhaust gas after-treatment device

A vehicle and a method of updating efficiency of a selective catalytic reduction filter (SCRF) of an exhaust treatment system of the vehicle are disclosed. The method includes obtaining an initial calculated efficiency of the SCRF, via a controller, regarding one of a NOx conversion, a reductant absorption, a reductant desorption and a reductant oxidation. The method also includes determining a soot mass estimate in the SCRF representative of an amount of soot collected inside the SCRF and determining a soot correction factor from the soot mass estimate. The method further includes calculating, via the controller, an updated efficiency value of the SCRF by multiplying the soot correction factor and the initial calculated efficiency to update efficiency of the SCRF.

Vehicle and a method of updating efficiency of a selective catalytic reduction filter of an exhaust treatment system of the vehicle

A urea injection controller for a motorized system includes a passive regeneration model configured and disposed to calculate an amount of NOx conversion resulting from an interaction between exhaust gases and soot entrained in a selective catalyst reduction filter (SCRF) device, a replenishment mode trigger module configured to set an ammonia replenishment request based on the passive regeneration model, and a replenishment control module configured to selectively activate a urea injector to discharge a particular amount of urea based on the regeneration model.

Urea injection controller for a motorized system

A system and method for adapting the clean filter correction map for a selective catalyst reduction filter SCRF of an exhaust gas aftertreatment system are provided. The system may be in fluid communication with an engine of a vehicle. The system may include a first pressure sensor and a second pressure. A differential pressure module is in communication with the first pressure sensor and the second pressure sensor and configured to generate a delta pressure signal corresponding to a pressure drop between the first pressure sensor and the second pressure sensor. The system may also include a controller configured to determine a number of completed regeneration events of the SCRF; compare the number of completed regeneration events to an evaluation element; and enable an adaptation module by executing one of a first control action, a second control action, and a third control action.

Method and system for adapting a clean filter correction map for a selective catalyst reduction filter

In an exemplary embodiment, an internal combustion engine includes an oxidation catalyst configured to receive an exhaust gas flow from the internal combustion engine, a urea injector positioned downstream of the oxidation catalyst to inject a urea flow into the exhaust gas flow and a mixer positioned downstream of the urea injector to mix the exhaust gas flow and the urea flow to form a mixed exhaust gas and urea flow. The engine also includes a particulate filter and catalytic reduction assembly positioned downstream of the mixer to receive the mixed exhaust and urea flow from the mixer to form a treated exhaust gas flow and an exhaust gas recirculation system coupled to the particulate filter to receive a portion of the treated exhaust gas flow and recirculate the portion of the exhaust gas flow to be mixed with a fresh air flow for the internal combustion engine.

Exhaust aftertreatment and exhaust gas recirculation systems

A vehicle and method of updating aging of a selective catalytic reduction filter (SCRF) of an exhaust treatment system of the vehicle are disclosed. The method includes determining a desorption rate estimate of a catalyst of the SCRF and determining an ash volume estimate representative of an amount of ash collected inside the SCRF. The method also includes determining an ash correction factor from the ash volume estimate and calculating, via a controller, a corrected desorption rate value by multiplying the ash correction factor with the desorption rate estimate to update the aging of the SCRF.

Vehicle and a method of updating aging of a selective catalytic reduction filter of an exhaust treatment system of the vehicle

A vehicle and a method of determining a reductant storage capacity set point of a selective catalytic reduction filter (SCRF) of an exhaust treatment system of a vehicle are disclosed. The method includes determining a storage estimate of a reductant inside the SCRF and determining a particulate estimate in the SCRF representative of an amount of particulate matter collected inside the SCRF. The method also includes determining a particulate correction factor from the particulate estimate and calculating, via a controller, a set point value of the reductant in the SCRF by computing together the particulate correction factor and the storage estimate to determine the reductant storage capacity set point of the SCRF.

Vehicle and a method of determining a reductant storage capacity set point of a selective catalytic reduction filter of an exhaust treatment system of the vehicle

An exhaust system is provided. The exhaust system includes a first sensor that senses a level of nitrous oxide (NOx) in exhaust gas and generates a first sensor signal. A second sensor senses a level of ammonia (NH3) in the exhaust gas and generates a second sensor signal. A control module receives the first sensor signal and the second sensor signal, determines a desired reductant dosage based on the first sensor signal and the second sensor signal, and generates an injector control signal based on the desired reductant dosage.

Selective catalytic reduction device control methods and systems

An exhaust treatment system is disclosed that can diagnose the performance of an exhaust treatment oxidation catalyst in converting NO to NO. The exhaust treatment system is fluidly coupled to an internal combustion engine, and includes an oxidation catalyst disposed in an engine exhaust stream; a reductant source for injecting a reductant into the exhaust stream downstream of the oxidation catalyst; an SCR catalyst disposed in the exhaust stream downstream of the reductant source; and a gas sensor, disposed in the exhaust stream downstream of the oxidation catalyst and upstream of the reductant source, comprising a plurality of sensing or pumping cells that measures NO concentration in the exhaust gas and NOconcentration in the exhaust gas.

Apparatus and method for onboard performance monitoring of oxidation catalyst

In an exemplary embodiment of the invention an exhaust gas after treatment system for an internal combustion engine comprises an exhaust gas conduit configured to transport exhaust gas from the internal combustion engine to exhaust treatment devices of the exhaust gas treatment system. A controller in signal communication with the exhaust gas aftertreatment system is configured to monitor the temperature of a selective catalytic reduction device, wherein the controller is operable to move a valve assembly to an open position when the selective catalytic reduction device is at or above an operating temperature and to move the valve assembly to a closed position when the selective catalytic reduction device is below the operating temperature for entrainment of NOx constituents from the exhaust gas.

Exhaust system for internal combustion engine

An exhaust gas after treatment system for an engine comprises an oxidation catalyst NOx adsorber wherein an oxidation catalyst compound and a NOadsorber compound are disposed. A fuel injector is connected to and is in fluid communication with the oxidation catalyst NOx adsorber device for delivery of a hydrocarbon fuel thereto and an air pump is connected to and is in fluid communication with the oxidation catalyst NOx adsorber device for delivery of air thereto. The fuel injector and the air pump supply fuel and air to the oxidation catalyst NOx adsorber device for oxidation thereof and heating of the NOx adsorber compound to a NOrelease temperature following shut down of the internal combustion engine.

Growing community of inventors

Farmington Hills, MI, United States of America

Joshua Clifford Bedford