Two-Stage Variable Compression Ratio with Eccentric Piston Pin and Exploitation of Crank Train Forces

Event
SAE World Congress & Exhibition
Authors Abstract
Content
By variation of the compression ratio the fuel consumption of high boosted gasoline engines can be reduced, due to operating with higher compression ratios at low load compared to an engine with fixed compression ratio. The two-stage VCR-system enables a high share of fuel saving potential relative to full variable systems.
Considering a low cost manufacturability and a beneficial integratability into common engine architectures the length-adjustable conrod using an eccentric piston pin in the small eye has proved as the best concept. The adjustment is performed by a combination of gas and mass forces.
This article describes the design of such a two-stage VCR-system as well as the functional testing under motored and fired engine operating conditions.
Meta TagsDetails
DOI
https://doi.org/10.4271/2009-01-1457
Pages
10
Citation
Wittek, K., Tiemann, C., and Pischinger, S., "Two-Stage Variable Compression Ratio with Eccentric Piston Pin and Exploitation of Crank Train Forces," SAE Int. J. Engines 2(1):1304-1313, 2009, https://doi.org/10.4271/2009-01-1457.
Additional Details
Publisher
Published
Apr 20, 2009
Product Code
2009-01-1457
Content Type
Journal Article
Language
English