Achieving 70% Urban Fuel Consumption Reduction: An Opposed-Piston Engine-Based Mild-Hybrid Powertrain Architecture for Light Commercial Vehicles (JLA-2/JLA-T)

Abstract

This paper proposes a novel powertrain architecture for the urban Light Commercial Vehicle (LCV) segment, leveraging the compact JLA-2 opposed-piston (OP) engine paired with the reconfigurable JLA-T mild-hybrid architecture. Within SAE literature, OP engines are consistently associated with simplicity. As highlighted by Tom Ryan III (2008 SAE President) in the foreword of Opposed Piston Engines: Evolution, Use, and Future Applications, this architecture is characterized by its manufacturing simplicity” and described as a “relatively simple, robust, and cost effective” power unit solution. The present work builds on this established view.The JLA-2 engine solves traditional packaging constraints by reducing the block width by 30% for horizontal installation and is volumetrically self-sufficient, eliminating external compressors. Although the gear train required for crank synchronization introduces design challenges, explicitly accounted for in our model, the elimination of the cylinder head and valve train reduces component count. The study utilizes a comprehensive computational methodology—incorporating 0D/1D thermodynamics, 3D CFD, and FEA—to evaluate the system against a standard Ford Escape baseline.The JLA-T module mechanically blends torque using a planetary gear-set and a low-voltage 48V electric assist, capturing electrification benefits without the high costs and safety complexities of high-voltage systems. Simulation results suggest significant performance improvements, notably achieving a sub-9-second 0-100 km/h acceleration and enabling Zero Emission Vehicle (ZEV) compliance in restricted zones. Most significantly, the analysis indicates that this platform delivers up to a 70% reduction in urban fuel consumption when operated as a PHEV, driven by the system´s modularity and optimized energy recovery. This paper presents the system architecture, control logic, and performance comparisons, demonstrating a feasible technical pathway for decarbonizing urban transport fleets