New 6 cylinder petrol engine from BMW

Authors

R. Welzmüller, M. Wenzel, T. Sailer, M. Karl, M. Kaufmann - BMW Group

Summary

Despite the increasing supply and market penetration of electromobility, it will be important in this decade for efficient combustion engines to make their contribution to meeting CO2 targets. The challenge for the internal combustion engine is to exploit further CO2 potential and to comply with increasingly stringent global emissions legislation. To resolve this conflict of objectives, BMW has developed a new generation of a modular engine system, the so-called Efficient Dynamic Next (EDN) gasoline engines.

The innovation of this new generation is a significant reduction in drag torque through variability of the exhaust valves. The resulting energy savings can be stored in the 48V battery via a KSG. This energy can then be used for electric driving and e-Boost with the KSG, leading to a significant reduction in CO2 emissions from the overall drive system.

To ensure the ability to respond to future low emission requirements due to new legislation (EU7, C7 and LEV III), engine measures were developed to further reduce raw emissions. These measures are intake manifold injection in combination with direct injection and an electrically actuated cam phaser (eVANOS). In addition a modular emission system with a coated particulate filter close coupled to the engine was developed.

With this 48V powertrain, it has been possible to achieve a reduction in fuel consumption of 0.6-1.0l/100km in the WLTP for the new 7 Series compared with its predecessor. The power could be increased by 35kW, while complying with low emission legislation.