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MODEL-BASED OPTIMIZATION OF PARAMETERS FOR A DIESEL ENGINE SCR SYSTEM
L. LÜ,L. WANG 한국자동차공학회 2013 International journal of automotive technology Vol.14 No.1
A Selective Catalytic Reduction (SCR) system simulation model for diesel engines was established based on MATLAB/Simulink. The model includes four subsystems: signal acquisition, DEF (Diesel Exhaust Fluid) dosing control,catalytic chemistry reaction and NOX emissions reduction. The SCR control strategy was optimized based on ETC simulation results. Simulation and test results indicate that the model developed in this paper can predict ETC NOX emissions accurately.
EXPERIMENTAL AND 3D, EMBEDDED MODELING FOR DIESEL ENGINE SCR DEPOSIT
F. QIAN,L. LÜ,T. FENG,D. YANG 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.2
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 de-NOx 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 model-based 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.