Year: 2026
Type: article
Abstract: The Selective Catalytic Reduction System (SCR) system uses aqueous NH3 and catalyst for reducing the NOx emission emitted by the Compression Ignition (CI) engine exhaust. Due to stringent emission regulations and growing demand for SCR systems, significant improvements in its urea injection strategy and catalyst activity are required, in order to reduce exhaust gas by-products. In this study, an SCR system combined with a Super-Twisting Sliding Mode Controller (STSMC) is employed to regulate the exhaust gases of CI engines. The SCR system is represented by linearized state-space models of third and fourth order. The US06 emission cycle is used to determine the engine exhaust NOx characteristics, which are then fed into the SCR system. According to the simulation results, the fourth order SCR model has a better de-NOx conversion rate and less NH3 slip than the third order SCR model, due to the fast-SCR kinematics.
DOI: 10.19206/ce-225504
Language: English
Topic: Engine and Fuel Emissions
Subfield: Automotive Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7203892829