Increased gasoline engine efficiency due to an exhaust heat-driven cooling system

Charge air cooling below ambient temperature by an exhaust heat driven cooling system provides a promising approach to engine waste heat recovery. Due to decreased knocking probability at these conditions gasoline engines can be operated with increased compression ratio and/or advanced ignition timing to increase engine efficiency. The FVV project Heat2Cool (No. 965) conducted at TU Berlin investigates the potential and implementation possibilities of this concept.