Daimler HighTechReport: The Fascination of Technology - Issue 02/2008 - PART VI


Stuttgart, Nov 25, 2008

SCANNER: Spray-guided gasoline direct injection

Efficiency thanks to piezo injectors
Igniting the gasoline in a cylinder can be an art, especially when the fuel cloud is combusted in such a way that fuel consumption is reduced by ten percent. Thanks to spray-guided gasoline direct injection, the engineers at Daimler were the first in the world to accomplish this feat.

CGI (Stratified-charged Gasoline Injection) refers to an invention that uses highly precise piezo injectors that shape the gasoline spray into a uniform hollow cone. Because piezo injectors operate in fractions of a millisecond, they can achieve multiple injections per compression stroke, which is necessary for the lean-burn operating mode and results in significantly lower fuel consumption compared to duct injection.

The new combustion method celebrated its premiere in 2006 in the Mercedes-Benz CLS-Class. Since the end of 2007 it has also been offered in the E-Class. CGI is part of the extremely energy-efficient modular DIESOTTO concept implemented in the F 700 research vehicle.

The 350 CGI engine of the CLS

The V6 engine with 3,498 cc of displacement develops a maximum torque of 365 Nm, generates 215 kW/292 hp and consumes 9.1–9.3 l/100 km.

1 Air intake port
2 200-bar piezo injector for spray-guided gasoline direct injection
3 Common rail for fuel
4 Spark plug
5 Exhaust port for exhaust gases
6 Combustion chamber in the cylinder
7 3-way catalytic converter close to the engine
8 NOx storage catalytic converter
9 7G-TRONIC automatic transmission

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