Gm Global Technolgoy Operations, Inc.

Luis Daniel Guerrero Cruz

Luca Lauritano

Mariano Nocereto

Gongshin Qi

Michael A Smith

Raffaello Ardanese

Michele Bilancia

Stefano Cassani

Claudio Ciaravino

Giorgio Sticchi

Alberto Giordano

Francesco Irlando

A method of adjusting reductant injection for a selective catalyst reduction device with a soot filter (SCRF) includes calculating, through a processor, an amount of soot in the SCRF, determining, through the processor, a shrinking core model of the SCRF based on the amount of soot, calculating, with the processor using the shrinking core model, an amount of reductant to inject into the SCRF, and injecting the amount of reductant into the SCRF.

Method and system for adjusting reductant delivery into a selective catalytic reduction with a filter (SCRF) device

A method for treating exhaust gas from an internal combustion engine including, determining if a steady state condition exist and perturbing a reductant injection corresponding the steady state. Measuring a first and a second NOx values corresponding to the steady state and resulting from the perturbation, and computing a gradient of the NOvalues relative to the steady state respectively. The method also includes comparing the gradient of the second NOvalue with one of the first NOvalue, if the gradient of the first NOx value is within a selected range of the gradient of the second NOx value, identifying poor efficiency operation for the engine and setting an estimated reductant storage at zero. Otherwise if the gradient of the second NOx value exceeds a selected threshold, identifying a reductant slip condition and setting the estimated storage at maximum, if not, making no corrections in estimated storage.

Underflow selective catalytic reduction steady state ammonia slip detection with positive perturbation

Described herein is a method for detecting steady state ammonia slip for a motor vehicle having an internal combustion engine and an emissions control system. The emissions control system includes a selective catalytic reduction (SCR) device, a NOx sensor, and a controller. The controller executes a method for ammonia slip detection that includes determining if the SCR device is at steady state, comparing a NOx measurement from the NOx sensor with a predicted NOx value. If the NOx measurement exceeds the predicted NOx value by a threshold, perturbing a reductant injection, the perturbation having a selected magnitude and a selected duration. The method also includes measuring a NOx value resulting from the perturbation and computing a gradient thereof relative to the measured NOx, and ascertaining if a gradient of the NOx resulting from the perturbation exceeds a threshold and identifying a reductant slip condition if so.

Selective catalytic reduction steady state ammonia slip detection with positive perturbation

A method and system is disclosed to test for a proper functioning of a selective catalytic reduction system of an internal combustion engine. The engine is operated at idle speed and a functionality check of the pressure sensor is executed. The engine is operated to increase an exhaust gas temperature in the exhaust pipe upstream of the catalyst and a functionality check of the pump is executed. A functionality check of the injector is executed after the functionality check of the pump and once the exhaust gas temperature has reached a predetermined target value thereof. A functionality check of the supply conduit is executed after the functionality check of the injector. The selective catalytic reduction system is identified as functioning properly when all of the functionality checks yields a positive result or malfunctioning when any one of the functionality checks yields a negative result.

Method of testing a proper functioning of a selective catalytic reduction system

A computer program, system and method are provided for thermally regulating an injector injecting a reducing agent into an exhaust pipe of an internal combustion engine. A pump is activated to deliver a coolant in a coolant circuit having a portion in heat exchange relation with the injector. A value is determined for a mass flow rate of the coolant delivered by the pump. A value is calculated for a temperature of the injector as a function of the determined value of the mass flow rate. A difference is calculated between the calculated value of the injector temperature and a predetermined set-point value thereof, and the mass flow rate of the coolant delivered by the pump is adjusted on the basis of the calculated difference.

Method for thermally regulating an injector for injecting a reducing agent into an exhaust pipe of an internal combustion engine

A method of monitoring the reductant delivery performance of a selective catalytic reduction component of a vehicle exhaust system, includes operating a diesel exhaust fluid pump until a reductant delivery performance pressure setpoint is reached. Calculating an average pump duty cycle and commanding the calculated pump duty cycle to be used in the open loop control phase. Calculating an initial average pressure. Injecting a controlled diesel exhaust fluid (DEF). Calculating a final average pressure. Calculating a pressure drop &#x394;P and determining if the calculated pressure drop &#x394;P is less than an expected pressure drop calculated as a function of the average pump duty cycle.

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Turin, Italy

Luis Daniel Guerrero Cruz