Fuel consumption and pollutant emissions always play a large role in the development of new engine generations. Next to further fuel consumption optimizations for diesel engines, the development of efficient and clean gasoline engines is increasingly becoming the focus of vehicle manufacturers.

Promising starting points for reducing fuel consumption are, for example, the reduction of the displacement and a reduction in the number of cylinders in the combustion engine, which is also known as downsizing. The loss of power and driving comfort resulting in the use of smaller displacement engines as compared to the power and driving comfort of its higher capacity brothers, in particular the lack of torque in the lower RPM ranges, need to be compensated for through the use of a suitable, powerful charging system. In addition to turbochargers with variable turbines or regulates 2-stage turbocharging systems (R2S®™), electrically assisted charging systems are increasing being viewed as a possible solution.

As the leader in technology in the field of charging systems, BorgWarner Turbo Systems has emphatically pushed for the development of the innovative eBOOSTER® concept. This electrically assisted charging system uses a flow compressor driven by an electric motor placed as a component before or after the turbocharger. In contrast to electrically assisted turbochargers, this system works with two stages, i.e. like two turbo-machines connected in series. In doing so, the pressures of the two charging units are multiplied.

Through the use of two perfectly matched flow compressors it is possible to optimally adapt the entire system to the particular purpose and expand its entire power curve. eBOOSTER®s and exhaust turbochargers are also separate units. This has the distinct advantage that, when suitably positioned, the thermomechanical stress on the electrical and electronic components is significantly less than with electrically assisted turbochargers.

The eBOOSTER® permits the development of small and efficient high-performance turbocharged engines whose dynamic response matches that of large non-supercharged engines of the same output class. The superiority of the eBOOSTER® was impressively demonstrated in close cooperation with various customers for gasoline engines as well as for diesel engines.