The assessment of efficiency potential in hybrid electric turbocharged spark-ignition internal combustion engines (SI ICE) presents a significant opportunity for enhancing powertrain performance while reducing fuel consumption and emissions. This study investigates the integration of hybrid electric turbocharging technology for large SI ICE to optimize fuel efficiency and overall engine output. By analysing key performance parameters, including pressure and thermal dynamics, fuel consumption, and emission characteristics, this research provides insights into the feasibility of hybrid turbocharged SI ICE systems as a transitional solution toward sustainable transportation.
A comprehensive GT-POWER modelling and simulation approach of a CAT G3508a SI gas engine is employed to evaluate hybridization strategies for steady state static simulations. Experimental validation through test bench data substantiates the accuracy of the engine model, ensuring practical applicability. The study explores the synergy of electrical recuperation and forced induction of the CAT G3508a to enhance brake thermal efficiency across different operating conditions. Results indicate that the introduction of an electric machine in the turbochargers rotating assembly significantly improves engine efficiency, particularly at partial load conditions, where conventional SI-ICE often suffer from reduced efficiency due to pumping losses. Fuel economy improvements, reductions in carbon emissions and system versatility demonstrate the potential of this technology to bridge the gap between conventional fossil fuels and alternative fuels.