Gm Global Technolgoy Operations, Inc.

David Tulli

Giuseppe Mazzara Bologna

Vincenzo Alfieri

Giuseppe Conte

Carmen Pedicini

Maria Camuglia

Carlos Ildefonso Hoyos Velasco

An automotive vehicle includes an internal combustion engine and an exhaust system. The exhaust treatment system includes a dosing system that injects NHinto an exhaust gas stream generated by the engine. An SCR device stores an amount of the NHand converts NOx into diatomic nitrogen (N) and water (HO) based on the stored amount of the NH. The vehicle further includes an SCR status estimator device and a controller. The SCR status estimator device determines an NHcoverage ratio (R), which indicates a stored amount of NHwith respect to a maximum NHstorage capacity of the SCR device. The controller determines a target NOx reduction efficiency (&#x3b7;) of the SCR device, and an NHcoverage ratio set point (R) based on the &#x3b7;. The controller also generates an NHcontrol signal (u) that controls the dosing system based on a comparison between the R and the R.

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Turin, Italy

David Tulli