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Concepts for improved fuel economy from gasoline engines

Abstract The paper reviews various technologies for fuel economy improvement in gasoline engines and discusses how they interact. Advanced valve train systems, gasoline direct-injection systems, and gasoline homogeneous charge compression ignition mechanisms are considered, together with further technologies which facilitate engine downsizing. Approaches to powertrain hybridization are outlined and a pneumatic system is described which can be used at vehicle launch. Finally, combined technologies are suggested which map the evolution towards meeting future legislative requirements for CO2 emissions.