Projektträger: ETN Forschungszentrum Jülich GmbH

Generating electricity from exhaust gas to electrify the charging system and provide electrical support for the drive train is an innovative approach to meeting stricter CO2 requirements through electric hybridization. This requires the development of a generator turbine and motor compressor system for speeds of up to 180,000 rpm and outputs of up to 20 kW. The exhaust gas turbine-driven generator is intended to generate electricity from the axhaust gas of the combustion engine. The electric motor-driven compressor for charging the combustion engine is completely decoupled from the exhaust gas turbine both mechanically and thermodynamically, and can therefore operate completely independently.

Depending on the operating point of the combustion engine, the exhaust gas turbine-driven generator can generate more electricity from exhaust gas than the electric motor needs to drive the supercharger. In electric hybrid drive systems, this excess electrical energy can be fed into the battery, directly supporting the drive train and powering auxiliary electrical units (e.g., water pump, air conditioning compressor).

The aim is to integrate the high-speed exhaust gas turbine generator and high-speed compressor motor developed by TTI into a combustion engine test vehicle system at the engine test bench of Ruhr University Bochum and to determine the efficiency gains and reduction in consumption of the electrically charged motor. This requires extensive numerical and experimental testing. The specific effects of the electric charging system on all relevant engine parameters (e.g., efficiency, emissions, response behavior) are to be investigated and evaluated in detail at the test bench at Ruhr University Bochum. From this, general strategies for improving the efficiency of electrically charged combustion engines are to be derived.