Future Gasoline Engine Technologies for 130 g/km CO₂

Authors

G.K. Fraidl, P.E. Kapus, H. Friedl AVL List GmbH

Year

2007

Summary

The reduction of CO2 emission is the most significant challenge with the development of passenger car powertrains. Whereas on a first sight especially Diesel engines and Hybrid seems to be the most appropriate solution, especially in view cost also the Gasoline engine is most important to generate affordable solutions. As the various Gasoline engine technologies offer quite differentiated fuel economy characteristics, a cost effective technology selection has to be done considering the whole system: vehicle – engine – gearbox – hybridization. Consequently, in the respective vehicle classes, different technologies prove to be most cost effective. With small vehicles especially cam phaser + variable charge motion is applied which is partially extended by variable valve lift with larger vehicles. The most significant technology trend, however, is downsizing / downspeeding based on GDI + turbocharging. Spray guided stratified charge systems offer a significant fuel consumption potential primarily at low engine loads, however, are limited especially by the lean exhaust gas aftertreatment both in view of applicability and cost efficiency. Measures to reduce the parasitic losses, improved energy management as well as start / stop systems will be applied more frequently within all vehicle classes. With an intelligent combination of engine technology, gearbox concept, simple hybridization and additional refinement, a CO2 emission of < 130 g/km can be obtained also with Gasoline engines up to mid sized vehicles within attractive fun to drive and reasonable costs. Thus especially turbocharged GDI becomes an attractive competitor to the successfull Diesel engine.

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