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VORTRAG
28.02.2013

Improvement in efficiency of a race engine by using a heat energy recovery system / Effizienzsteigerung eines Rennmotors durch ein Abgasenergierückgewinnungssystem

Vortrag bei 13. Internationales Stuttgarter Symposium 2013
Automobil- und Motorentechnik

Energy recuperation / Energierückgewinung
Referent(in): Dipl.-Ing. Johannes Dawidziak, Prof. Dr.-Ing. Michael Bargende; University, Institute of Internal Combustion Engines and Automotive Engineering
Co-Autor(en): Dr.-Ing. Marc Feßler, Dipl.-Ing. Wolfgang Kotauschek, Dipl.-Ing. Ulrich Baretzky; AUDI AG

Ongoing development of drive technologies that make efficient use of energy is a major factor in assuring the continuation of current levels of mobility. For this, sustainable use of finite energy resources and the reduction of pollutant emissions are necessary.
Motor sport is a platform for demonstrating the successful use of new technologies. The short development cycles in race engine development and the high mechanical loads incurred during races are an excellent environment for the testing and presentation of new drive technologies. Long-distance races, and in particular the ‘FIA World Endurance Championship’ series introduced in 2012, are a well-known platform for the development of prototypes and thus for vehicles incorporating technological innovations. In this WEC series, the event with the most distinguished tradition is the Le Mans 24-hour race.
In recent years, the organisers and competitors paved the way for efficiency- oosting systems in this race series. The aim is to promote technological transfer to seriesproduction vehicle development and in this way to secure the public appeal and benefit of long-distance motor racing in the long term as well. With this in mind, significant changes to the regulations were made. If participants can expect to be successful in the future, they must respond to changes in the peripheral conditions of the technical regulations and introduce innovative systems on their race cars that have the effect of enhancing efficiency. This calls for a fundamental examination of all practicable concepts for increasing engine efficiency, so that their potentials can be compared.
In view of the specific boundary conditions applicable in motor sport, significant differences arise in the requirements that race cars and series-production cars must satisfy. Individual examination is therefore needed in order to establish the basic design ratings of suitable efficiency-enhancing systems in motor sport. This was the background against which the scientific project described here was undertaken by way of the HIN (Hochschulinstitute Neckarsulm) academic cooperation between AUDI AG and the Institute of Combustion Engines and Automotive Engineering (IVK) of Stuttgart University. Its aim is the methodical compilation of a system for increasing the efficiency of the vehicle’s engine within the driveline. In the course of this work, specific peripheral motor racing conditions were first identified and analysed. With this as a basis, possible systems for increasing the efficiency of the vehicle’s driveline were described. To permit comparisons between the potential of these concepts, suitable evaluation criteria are defined, with the aid of which various simulation tools are used to identify and determine the potential of the most promising systems.

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