Pre-turbo Exhaust Gas Aftertreatment for Hybridized Diesel Passenger Cars

The article presents a groundbreaking pre-turbo exhaust gas aftertreatment system (PT-EATS) designed for hybridized diesel passenger cars. Developed by TU Darmstadt and industry partners, this system aims to reduce nitrogen oxide emissions by positioning an additional selective catalytic reduction system upstream of the exhaust gas turbocharger. By leveraging thermodynamically favorable conditions, the PT-EATS enhances exhaust catalysis and expands the operating range of the EATS, particularly in urban areas and low-temperature driving scenarios. The system includes a dual swirl concept for urea/water solution treatment and a copper zeolite SCR that demonstrates high NOx conversion rates. The holistic EATS is tested on an Engine-in-the-Loop test bench, showing significant reductions in NOx emissions in various driving scenarios, including the Worldwide Harmonized Light Vehicles Test Cycle (WLTC). This innovative approach offers a promising solution for meeting future emission regulations without the need for CO2-intensive heating measures.