Variable Compression Ratio - A Design Solution for Fuel Economy Concepts 2002-01-1103
The challenge to reduce fuel consumption in S.I. engines is leading to the application of new series production technologies: including direct injection and, recently, the variable valve train, both aiming at unthrottled engine operation. In addition to these technologies, turbo- or mechanical supercharging is of increasing interest because, in principle, it offers a significant potential for improved fuel economy. However, a fixed compression ratio normally leads to a compromise, in that the charged engine is more of a performance enhancement than an improver of fuel economy. Fuel efficient downsizing concepts can be realized through the application of variable compression ratio. In this paper, a variable compression ratio design solution featuring eccentric movement of the crankshaft is described. Special attention is given to the integration of this solution into the base engine. The resulting design turns out to be a good compromise between weight, packaging and cost and represents a basis for downsizing-based fuel economy improvement concepts.
Citation: Schwaderlapp, M., Habermann, K., and Yapici, K., "Variable Compression Ratio - A Design Solution for Fuel Economy Concepts," SAE Technical Paper 2002-01-1103, 2002, https://doi.org/10.4271/2002-01-1103. Download Citation
Author(s):
Markus Schwaderlapp, Knut Habermann, Kurt I. Yapici
Affiliated:
FEV Motorentechnik GmbH
Pages: 10
Event:
SAE 2002 World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Variable Valve Actuation 2002-SP-1692, SAE 2002 Transactions Journal of Engines-V111-3
Related Topics:
Fuel economy
Fuel consumption
Valve trains
Crankshafts
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