Gas Exchange as Energy Resource - Investigations with a Turbogenerator in the Intake Section
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s Exchange as Energy Resource – Investigations with a Turbogenerator in the Intake Section A turbogenerator allows energy recovery from throttle losses, excess exhaust gas and waste heat in the relevant engine operating range. The concept presented here by sa-charging solutions, Sonceboz, the IFKM at the KIT and Mercedes-Benz focuses on the easier-to-manage cold side of the engine. The considerable potential of the system is confirmed by simulation-based investigations as well as measurements on the hot gas and engine test bench.
© sa-charging solutions
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AUTHORS
Pascal Mühlebach, M. Sc. ETH ME is Deputy Site Manager at sa-charging solutions AG in Mellingen (Switzerland).
STARTING POINT
To further reduce the efficiency disadvantages of the gasoline engine compared to the diesel engine it is worth addressing the still remaining potential with new strategies. Dethrottling on the stoichiometrically operated gasoline engine currently focuses primarily on downsizing via load point shifting. Via additional variabilities in the valve train, often including up-to-date developments, in the context of the Miller cycle, the characteristic throttle losses for this engine type can be further reduced. There is additional potential for increasing efficiency in the turbocharged gasoline engine in that from medium engine loads and speeds, considerably more turbine power can be generated than is required on the compressor side for the respective engine operating point. The principle use of the excess turbine power, depending on the turbine design, is to feed out electrical power via a generator disposed on the shaft of the exhaust gas turbocharger and in this way to increase the overall efficiency of the drive system. This approach has been used since 2014 for example in Formula 1, where it contri butes to high engine efficiency in the main operating range at high loads and engine speeds [1]. Although the operating point distribution under real driving conditions in the case of series-production vehicles offers somewhat less favorable conditions, there is potential even here to recover energy from the exhaust side. The associated system complexity and the technical challenges with the integration of the e-motor due to the high speeds and, depending on configuration, high temperatures at the turbocharger nevertheMTZ worldwide 10|2020
Dipl.-Ing. (FH) Daniel Sigg is Director Advanced Development at Sonceboz Automotive AG in Sonceboz (Switzerland).
Thomas Weyhing, M. Sc. is Research Associate at the Institute for Piston Engines (IFKM) at Karlsruher Institut for Technology (KIT) in Karlsruhe (Germany).
less represent an obstacle for imple mentation in mass production. One alternative is energy recuperation on the easier-to-manage air side of the gasoline engine.
Werner Thoma, M. Sc. is Development Engineer Simulation Cooling Systems and Innovations at Mercedes-Benz AG in Sindelfingen (Germany).
engine. FIGURE 1 illustrates a possible layout for the integration of this kind of turbogenerator in the air path of a gasoline
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