Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

Joint research commitment on gasoline direct injection

The demands for lower emissions and reduced fuel consumption require new engine technologies. The most important and effective one is the switch from manifold injection to direct injection of fuel into the engine cylinder. The major task during this development is the screening and testing of suitable injection systems with different engine concepts. All major European engine manufacturers have recognized these needs and have decided to make this common effort in order to be competitive with engine manufacturers outside Europe.

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 nitrogen oxides emissions could not be achieved until the end of the project. The nitrogen oxides emissions are so high, that today's catalytic systems would not be sufficient to achieve the proposed nitrogen oxides standards for gasoline engines. They can be achieved only by reducing the fuel consumption benefit. The legislation should allow higher nitrogen oxides standards for DI-gasoline engines similar to diesel engines. This way a particle-free gasoline engine could be offered with carbon dioxide emissions as low as with diesel engines. An additional condition for a successful exhaust gas after-treatment is a gasoline which contains less than 50 parts per million (ppm) sulphur. The nitrogen oxides catalyst will be destroyed by today's European gasoline.

Reported by

Volkswagen AG
38436 Wolfsburg
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