Multi-variable Gasoline Engine for Lowest CO2 Emissions
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The fuel consumption of traditional combustion engines requires continuous reduction to meet future CO2 fleet targets. To this end, FEV and the Institute for Combustion Engines (VKA) at RWTH Aachen University have investigated the potential of the following measures in a 1.0-l turbocharged gasoline direct-injection engine: split exhaust ports, mixed-sequential turbocharging, fully variable valve train on intake and exhaust side, two-stage variable compression, as well as split cooling and a variable oil pump.
After finishing the concept design phase of the multi-variable gasoline engine Varimot, these technologies have been evaluated both on the component as well as the engine test bench level and implemented in a vehicle demonstrator. The focus of the research project was on combining these engine technologies in order to achieve the following development goals:
high specific power output of 110 kW/l at λ = 1
low-end torque of 200 Nm/l (pme = 25.2 bar) at 1400 rpm
The results presented here originate from the consortium project "VARIMOT 19U15011," which is funded by the Federal Ministry of Economics and Technology (BMWi) according to a decision of the German Bundestag. We would like to thank our partners Ford Werke GmbH, Pierburg Rheinmetall Automotive, Schaeffler GmbH as well as the Labor für Kolbenmaschinen of the Heilbronn University for the good collaboration, and the project sponsor TÜV Rheinland for its support. In addition, we would like to thank Garrett Advancing Motion for providing the turbochargers.