POWERTRAINS AND FUEL ECONOMY - AUTOLINE THIS WEEK 1628

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This episode of Autoline This Week delves into the critical advancements in automotive powertrains and fuel economy, driven by stringent CAFE standards. The panel of experts, including representatives from BorgWarner, GM, and Chrysler, discusses the industry's strategies to meet the 2025 target of 54.5 MPG. Key technologies highlighted include turbocharged, downsized engines with direct injection and variable valve timing, advanced transmissions (8- and 9-speed automatics, dual-clutch), and the integration of mild-hybrid systems like GM's eAssist. While turbocharged engines have significantly improved, challenges remain in balancing performance with fuel efficiency, particularly in engine responsiveness during acceleration from low speeds. The discussion also touches upon the potential of hydraulic hybrids for commercial vehicles and the ongoing innovation in turbocharging, such as cooled EGR and advanced valve event modulation. The consensus is that a holistic, system-level approach integrating engine, transmission, and other components is crucial for future fuel economy gains, rather than relying on a single 'winning' technology.