A cooperative program between the DOE Office of Heavy Vehicle Technology and Caterpillar is aimed at demonstrating electric turbo compound technology on a class 8 truck engine. The goal is to demonstrate the level of fuel efficiency improvement attainable with an electric turbocompound system. As opposed to mechanical turbo compound systems, the electrical system has no mechanical connection to the diesel engine. Recovery of energy from the diesel engine exhaust is done electrically. The system consists of a turbocharger with an electric motor/generator integrated into the turbo shaft. The generator extracts surplus power at the turbine, and the electricity it produces is used to run a motor mounted on the engine crankshaft, recovering otherwise wasted energy in the exhaust gases. The electric turbocompound system also provides more control flexibility in that the amount of power extracted can be varied. This allows for control of engine boost and thus air/fuel ratio. The paper presents the status of development of an electric turbocompound system for a Caterpillar heavy-duty on-highway truck engine. The system architecture layout, turbo charger design features, and the development of a system control strategy are discussed. Furthermore, engine simulation results are presented, and electrical machinery developments are described. Compared to a mechanical system it offers a more flexible engine operation, e.g. air/fuel control and turbo assist mode. Performance predictions indicate 5 to 10 % improvement in fuel consumption. System capability offers the potential for reduced emissions and improved driveabilty through improved air system response using the turbo assist capability. The paper also reviews the results of a thermal and structural analysis for the complete turbo charger structure.
Diesel engine electric turbo compound technology
2003
7 Seiten, 13 Bilder, 4 Tabellen, 5 Quellen
Conference paper
English
Diesel Engine Electric Turbo Compound Technology
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