公开(公告)号：US20170306819A1

公开(公告)日：2017-10-26

申请号：US15496746

申请日：2017-04-25

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Vincenzo ALFIERI ,  Giuseppe MAZZARA BOLOGNA ,  Giuseppe CONTE ,  Alberto BEMPORAD ,  Daniele BERNARDINI

IPC: F01N3/20

CPC classification number: F01N3/208 ,  F01N9/00 ,  F01N9/005 ,  F01N2560/021 ,  F01N2900/1812 ,  Y02T10/24 ,  Y02T10/47

Abstract: A method is disclosed for controlling an injector for injecting a reductant into a selective catalytic reduction system of an internal combustion engine. A value of a concentration of nitrogen-oxides in the exhaust gas aftertreatment system downstream of the selective catalytic reduction system is measured, and a first difference is calculated between the measured value of the nitrogen-oxides concentration and a predetermined reference value thereof. A value of a concentration of ammonia in the exhaust gas aftertreatment system downstream of the selective catalytic reduction system is measured, and a second difference is calculated between the measured value of the ammonia concentration and a predetermined reference value thereof. A quantity of reductant to be injected by the injector is calculated as a function of the calculated first difference and second difference, and the injector is operated to inject the calculated quantity of reductant.