Gm Global Technolgoy Operations, Inc.

Enrik Fetolli

Michael A Smith

Sarah Funk

David P Quigley

A vehicle includes an engine that combusts an air/fuel mixture to produce an exhaust gas stream containing oxides of nitrogen (NOx). A dosing system injects an amount of ammonia (NH) into the exhaust gas stream based on an initial NHinjection set point value. A selective catalyst reduction (SCR) device absorbs an amount of the NHcontained in the exhaust gas stream and reduces an amount of NOx. An electronic hardware controller predicts an NHslip condition during which a portion the absorbed NHwill slip from the SCR device, and modifies the initial NHinjection set point value based on the predicted NHslip condition. The controller further generates a modified NHinjection set point signal indicating an adjusted amount of the NHto inject during the predicted NHslip condition. The dosing system adjusts the amount of injected NHbased on the modified NHinjection set point signal.

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Ann Arbor, MI, United States of America

Enrik Fetolli