A Calculation Study of an Automobile Power Unit with Energy Recovery System

The need to increase fuel efficiency of vehicle power units has gained significant prominence. An efficient way to reduce operational fuel consumption of an automobile power unit is to utilize energy recovery systems. The authors examine a method of improving the power unit fuel efficiency indicators, which is based on the use of a mechanical energy accumulator represented as a flywheel (KERS — Kinetic Energy Recovery System). Calculation studies are carried out on the energy balance of the automobile power unit with the energy recovery system when the vehicle is tested in accordance with the EUDC, FTP-75 and WLTC driving cycles.  The calculations have shown that the installation of the Fly Wheel KERS energy recovery system on board of the vehicle allows a significant reduction in the capacity of the vehicle’s internal combustion engine. It has been established that for the two studied diesel engines (Volkswagen TDI 1,9L and Mercedes Benz 300SD OM 617) the engine capacity can be reduced respectively to 52% and 46% of the standard size. In the WLTC driving cycle it allows the reduction of fuel consumption by 41% and 30% respectively.

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