Experiment of selective catalytic reduction retrofit for euro 6 NOx emission level compliance for euro 5 light duty vehicle

International Automotive Conference 2018

Sala, R.^1 ; Krasowski, J.^1 ; Dzida, J.^1 ; Woodburn, J.^1

BOSMAL Automotive Research and Development Institute Ltd, Sarni Stok 93, Bielsko-Biala

43-300, Poland^1

关键词: Catalytic reduction systems;    Chassis dynamometers;    Diesel oxidation catalyst;    Engine control unit;    Exhaust gas temperatures;    Light duty vehicles;    retrofit;    Selective catalytic reduction systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/421/4/042070/pdf
DOI  :  10.1088/1757-899X/421/4/042070

来源: IOP

【 摘 要 】

An independently developed retrofit selective catalytic reduction (SCR) system was implemented onto a Euro 5 light duty vehicle, in order to comply with the Euro 6 nitrogen oxides (NOx) limit over the legislative laboratory cycle. The SCR catalytic converter was fitted to the existing exhaust line, downstream of the diesel oxidation catalyst and the particle filter. The urea dosing system, including NOx sensors, was set up onboard the vehicle in order to catalytically treat the exhaust gas and effectively reduce NOx. The urea injection strategy was managed by an external dosing control unit, while the engine calibration was not modified and remained at the Euro 5 level. The legislative tests were performed in an emission laboratory on the chassis dynamometer installed in a climatic chamber. The reference emission level of the unmodified vehicle and aftertreatment layout was established. Following SCR retrofitting process, the emission cycles were repeated, and the results obtained were compared. The SCR system effectiveness was found to be in a close correlation with exhaust gas temperature. The presented test results gave an insight into the possibility of significant NOx reduction in modern light duty vehicles by means of usage of an add-on type of NOx catalytic reduction system, without modifications to the engine control unit.