Application of 48V Mild-Hybrid Technology for Meeting GHG and Low NOx Emission Regulations for MHD Vehicles

Abstract

<div class="section abstract"><div class="htmlview paragraph">Vehicle OEM’s for MHD applications are facing significant challenges in meeting the stringent 2027 low-NOx and GHG emissions regulations. To meet such challenges, advanced engine and aftertreatment technologies along with powertrain electrification are being applied to achieve robust solutions. FEV has previously conducted model-based assessments to show the potential of 48V engine and aftertreatment technologies to simultaneously meet GHG and low NOx emission standards. This study focuses on evaluating the full potential of 48V electrification technology through addition of 48V P3 hybrid system to the previously developed 48V advanced engine and aftertreatment technology package.</div><div class="htmlview paragraph">Previously, a model-based approach was utilized for selection and sizing of a 48V system-enabled engine and aftertreatment package for class 6-7 MHD application. The advanced engine and aftertreatment technology package comprised of engine downspeeding, exhaust VVT, close-coupled SCR, and 48V system components such as ETurbo , EGR pump, and catalyst heater. The performance of the advanced engine and aftertreatment package was compared to that of the baseline engine over engine certification cycles.</div><div class="htmlview paragraph">To assess the full potential of the 48V technology, the advanced engine and aftertreatment package was integrated with a 48V P1P3 hybrid powertrain. The performance of the baseline and the advanced vehicle were compared over the 3 Bin Moving Averaged Method instituted by CARB under omnibus regulation. The critical parameters compared were fuel economy, tailpipe NOx emissions, aftertreatment system temperature, and payback period. The analysis showed the potential offered by the 48V hybrid system for meeting future low NOx and GHG emission regulations.</div></div>