It is well known that the fuel consumption of a motor vehicle depends on many factors, including vehicle weight, air resistance, rolling resistance, the type of transmission; the engine size and the engine efficiency. Approaches made in the past to reduce fuel consumption were frequently aimed at improving engine efficiency with show revving, medium displacement engines with a low specific power output. This study is concerned with a different approach, based on relatively small engines with a high specific power output. The study investigates the extent to which modern design features such as multi-valve cylinder heads, variable valve timing, or variable intake systems could be used in engine/gearbox/vehicle combinations to significantly improve fuel economy. The effect of using continuously variable transmissions in conjunction with advanced engine designs is also investigated.
Engine and transmission concepts for future fuel economy requirements
Konzepte für Motor- und Kraftübertragung aus der Sicht der Optimierung des künftigen Kraftstoffverbrauchs
1990
6 Seiten, 11 Bilder, 2 Tabellen, 5 Quellen
Conference paper
English
Engine and transmission concepts for future fuel economy requirements
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