The target in fuel consumption was a reduction of 15% in the MVEG-test cycle. This was achieved by most of the concepts depending on the development stage of the engine in comparison. In absolute figures the fuel consumption for a 1250 lb-car is about 6,5 l/100 km.
As an emission target it was attempted to achieve the EUII-emission standards assuming that future catalyst technology will help to achieve lower standards. The NOx-emissions could not be achieved until the end of the project.
The NOx-emissions are so high, that todays catalytic systems would not be sufficient to achieve the proposed NOx-standards for gasoline engines. They can be achieved only by reducing the fuel consumption benefit.
The legislation should allow higher NOx standards for DI-gasoline engines similar to diesel engines. This way a particle-free gasoline engine could be offered with CO(2) emissions as low as with diesel engines.
An additional condition for a successful exhaust gas aftertreatment is a gasoline, which contains less than 50 ppm sulfur. The NOx-catalyst will be destroyed by todays European gasoline.
Gasoline four stroke engines suffer from relative high fuel consumption at part-load(city driving). This is due to the throttled operation typical for gasoline engines (diesel engines are more efficient,because they operate unthrottled). Within the proposed project prototype engines will be developed,which operate unthrottled on gasoline at part load by dirct injection of gasoline into the engine cylinder. The combustion and injection-system must be designed such that combustible mixture is located at the spark plug(stratification). At higher loads the engine will switch to stoichiometric operation for low emissions(3-way-catalyst)and high power output. It is expected to reduce fuel consumption -and CO2-emissions simultaneously-by at least 15%.
As development work in this technology has already started overseas,a consortium is founded for fast and cost-effective research and development within Europa. The consortium consists of Volkswagen, Fiat, Daimler-Benz, Renault, Siemens and a leading engine research laboratory:AVL in Graz (Austria).This precompetitive and collaborative work schedules prototype engines and injection systems at the end of the 3-year-project. The prototype engines are supposed to meet the stringent European emission standards planned 1999(CO<0.5g/Km;HC+NOx<0.5g/Km). For exploitation of the research work, siemens - as a supplier for fuel injection equipment-is involved.
Funding SchemeCSC - Cost-sharing contracts
10043 Orbassano Torino