Under the hood of the F 700 research vehicle lurks a completely new drive concept: the DIESOTTO engine.
For this engine Mercedes-Benz has combined the strengths of low-emission gasoline engines with the fuel consumption benefits of modern diesel engines. As with a conventional gasoline engine, the gasoline/air mixture is ignited by means of spark plugs when starting and under full load. At low and medium engine speeds – which engines run at most of the time – the gasoline engine automatically turns into a compression ignition engine, i.e. a diesel, and the mixture ignites in different locations simultaneously. This homogeneous combustion offers two advantages: lower fuel consumption and low nitrogen oxide emissions. The DIESOTTO engine is therefore able to use just a regular three-way catalyst, yet it currently already fulfills the future Euro 6 emissions standard.
The DIESOTTO principle
DIESOTTO is a modular engine concept featuring a variety of different high-tech elements: downsizing with turbocharging, direct gasoline injection, variable valve timing gear, homogeneous charge compression ignition, variable crank assembly as well as a hybrid module and an engine control module.
Clean power package
– Gasoline engine performance: 175 kW/ 
  238 hp + hybrid module: + 15 kW / 20 hp
– Max. torque: 400 Nm Acceleration
– 0 – 100 km/h: 7.5 seconds
– NEDC comb. fuel economy: 5.3 l/100 km
– CO2 emissions: 127 g/km

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