VariableCompression Ratio

7 - 8 February 2019

Garmisch-Partenkirchen, Germany

2nd International FEV Conference

Variable Compression Ratio

Dr.-Ing. Alexander Tolga Uhlmann
FEV Europe GmbH
Dr.-Ing. Alexander Tolga Uhlmann

A major benefit of the VCR technology is the CO2 benefit for gasoline powertrains. Tailoring of the C.R. to the engine load leads to significant fuel consumption improvements for the customer. Nowadays, enlargement of the λ=1 operating area is an additional major benefit to fulfill RDE legislation.

Varying the compression ratio on diesel engines results in reduced peak firing pressures and temperatures, beneficial for lowered thermo-mechanical stress and reduced engine-out pollutant emissions. This enables two different opportunities for VCR application. First option is to extend the power output on an already PFP limited base engine. Alternatively: Rightsizing the bearing dimension according the reduced peak firing pressure enables friction reduction and finally an improved fuel consumption. On top of these mechanical advantages, VCR provides potential to lower engine-out NOX under higher operating loads, important for optimal compliance of future RDE demands.

Dual fuel engines suffer from the compromise for the compression ratio. E.g. marine engines require a low compression ratio for the gas application while running most of the time on heavy fuel oil (HFO) where the high compression ratio would enable fuel consumption and operator cost reduction. Varying the compression ratio during engine operation is one measure to optimize efficiency for the different fuels.

About the FEV conference on Variable Compression Ratio

The conference will tackle various of these aspects, reviewing the state of the art and introduce interesting VCR solutions, among others the FEV VCR conrod, with reference to different technical applications.  

Apart from the deep insides into latest VCR Research and developments this new platform offers multiple opportunities for mutual exchange with reputable industry representatives and engineering experts.

Access the official Variable Compression Ratio Call-for-papers: click here.