DiesOtto

The Dies Otto engine (also Combined Combustion System or Combined Combustion Engines) is a Mercedes -Benz - specific term for engines with homogeneous charge compression ignition (CAI / HCCI ). This engine combines advantages of the diesel and gasoline technology.

Technical specifications of the test engine from Daimler AG:

• Displacement: 1800 cm ³
• Power: 175 kW ( 238 hp )
• Torque: 400 Nm
• Consumption: about 5.3 litres/100 km (super plus)

The Diesotto engine was first shown in the research vehicle Mercedes -Benz F 700 2007.

Challenge

With this system, the advantages of both engine concepts are combined, however, be without prejudice and challenges:

• Compression-ignition ( diesel): the advantage of low fuel consumption, precludes the pollutant emissions. The fuel is under very high pressure and sharp, very fine jets injects so that air prior to combustion can be hard mix with the diesel. As a result, undesirable particles.
• Gasoline engine: the advantage of lower pollutant emissions, is contrary to the ignitability. The higher the quality of the fuel ( high octane ), the anti-knock, or zündunwilliger he is. The combustion must necessarily be initiated by a spark.

Operation

The ignition is initiated via usual spark ignition at low and high load as in a petrol engine. In the medium performance range of the mixture combustion is initiated by homogeneous self-ignition. An electrically controlled camshaft adjustment controls the valve timing. The new technology package also includes direct injection, turbocharging and a variable compression.