Authors: F Qian L Lü T Feng D Yang
Publish Date: 2017/01/12
Volume: 18, Issue: 2, Pages: 219-227
Abstract
Nowadays the selective catalytic reduction SCR is a promising solution to fulfill stringent nitrogen oxide NOX emission standards enforced by worldwide regulation bodies for lean burning engines However in the practical operation urea deposits occur under unfavorable conditions which bring about a failure of urea dosing strategy affect the SCR system deNOx performance and lowering the fuel economy by increasing the engine back pressure This paper will present 3D deposit model which can be used to predict the deposit position Furthermore a modelbased controls strategy and calibration are designed The comparison test results of both engine emission tests and vehicle field tests shows there is significant deposits improvement with the embedded model
Keywords: