Upgrade for Mazda's Skyactiv-X Engine

The article delves into the upgrade of Mazda's Skyactiv-X engine, which initially impressed with its high efficiency in restricted areas due to a high compression ratio and lean combustion. BMTS Technology and Schaeffler Technologies propose a combination of an electrically assisted turbocharger with variable turbine geometry, variable valve train, and Miller valve timing to further boost efficiency and performance. The study, based on the 2020 Skyactiv-X engine, identifies four key areas for improvement: the Roots-type supercharger, combustion air ratio, center of combustion, and engine torque and power. The electrically assisted turbocharger, with a variable guide vane assembly, is highlighted for its ability to utilize exhaust enthalpy without any bypass, significantly enhancing efficiency. Additionally, the article explores the benefits of stoichiometric operation and Miller valve timings in improving low-end torque and reducing carbon monoxide emissions. The results show a substantial increase in engine power and a significant reduction in fuel consumption, making this upgrade a notable advancement in automotive engineering.