In this paper a novel IC engine load-control device is described which actively throttles the intake air and thereby produces electric power. The main component is a small axial turbine that replaces the conventional throttle. This turbine is connected with an electric generator and an appropriate electric load control system. This paper reports on the design, the realization, and the experimental verification of a novel load-contral device for spark-ignited engines. The system proved to have excellent dynamic properties, to reach the expected levels in electric energy production, and to have an interesting potential for full-size vehicles. To reach the potential benefits even for medium-size vehicles it will be necessary to develop a turbine of approximately half the size of the current LoRiSO3 design without sacrificing any system efficiency. While improving generator and turbine efficiency might also be interesting, an optimal match between the LoRiS system design and the combination of engine, vehicle, and driving pattern is more important. The control algorithms have to include 'supervisory' modules that optimally allocate air-mass flow and pressure drop to the different LoRiS parts such that the efficiency of the complete system is maximized in all driving situations.
Recuperative throttling of SI engines for improved fuel economy
2004
6 Seiten, 10 Bilder, 3 Tabellen
Aufsatz (Konferenz)
Englisch
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