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Dynamic oil pressure in connecting rod bearings and their influence on innovative cranktrain technologies

Institute for Combustion Engines VKA, RWTH Aachen University-Denis Pendovski, Stefan Pischinger
  • Technical Paper
  • 2019-01-2333
Published 2019-12-19 by SAE International in United States
In order to lower friction losses and hence ensure low fuel consumption of internal combustion engines, borderline design of hydrodynamic cranktrain bearings is often unavoidable. To realize this without the risk of failures, detailed modelling of hydrodynamic effects is gaining more and more relevance. In this publication, an approach using flow simulation to couple hydrodynamic bearings with each other, will be introduced. This allows the state variables of the fluid in the supply bore of the crankshaft to be calculated transiently. One important aspect of this concerns the solubility of gas in oil. This paper demonstrates that the gas fractions in the supply bore of the crankshaft influence the pressures at the hydrodynamic bearings. Additionally, simulation results will be shown and also validated with measurement data. Beside the application for conventional cranktrains, the developed methodology can also be applied to investigate lubrication systems, which include innovative technologies such as hydraulic, length adjustable connecting rods employed for variable compression ratio (VCR connecting rod).
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Coupled Dynamic Simulation of Two Stage Variable Compression Ratio (VCR) Connecting Rod Using Virtual Dynamics

SAE International Journal of Advances and Current Practices in Mobility

FEV Europe GmbH-Sebastian Sonnen, Alexander Uhlmann, Daniel Henaux
FEV India Pvt Ltd-Prashant Mane, Ralf Blum, Vijay Sharma
  • Journal Article
  • 2019-26-0031
Published 2019-01-09 by SAE International in United States
The fuel consumption of combustion engines requires continuous reduction to meet future CO2 fleet targets. The progression of emission legislations shifted the focus on PN and NOX emissions in real world driving scenarios (RDE). Recently, the monitoring of CO emissions puts high load fuel enrichment for component protection into focus and a ban on enrichment is widely expected. Hence, gasoline engine technologies, which enable Lambda 1 operation in the entire engine map are specifically promoted. Variable Compression Ratio (VCR) attacks all these topics already at the combustion process. In addition to the well-known CO2 capability, VCR also enables enlargement of the lambda 1 operation in gasoline engines as well as reduced NOX emissions in diesel engines. The basic principle of developed VCR solution is to change the effective length of the connecting rod (and thereby the compression ratio) in two stages by several millimeters. Basically, the VCR connecting rod consists of a mechanical and hydraulic system which is fed with oil by the connecting rod bearing. All functional elements to realize the variability such as…
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