ENGINES | Planning Group 2 »Combustion SI«

In order to design combustion engines even more efficiently and further reduce their consumption and emissions, researchers and developers are looking for the best possible combustion process.

Methods that enable an increasingly precise analysis of the processes taking place inside a combustion engine are of key importance for gaining an enhanced understanding of the thermodynamic processes. In a large number of individual projects, FVV researchers are investigating the combustion process using test engines equipped with the very latest measuring technology, as well as with calculations and numerical simulation tools. The focuses of this work include the design of new injection systems that distribute the fuel especially well in the combustion chamber, variable valve control for needs-based compression, and the research of new combustion processes.

» The research at FVV enables us to lay the technical groundwork in order to answer the geopolitical questions around energy supply. «

Dr. André Casal Kulzer (Porsche)

A further, current, research focus of the planning group is the question as to how the development of combustion processes and their application, i.e. feeding the engine control software with data, can be brought closer together. The approach here is to track the processes in the combustion chamber during application using sophisticated sensors and adapt the engine control immediately. As such, the collective research in the planning group results in a closed loop in which innovative measuring technology, new simulation models and the design of combustion processes optimise one another. The declared goal of the researchers here is not only to further reduce fuel consumption and thus also CO2 emissions, but also to minimise the formation of pollutants through the cleanest and most complete combustion possible.

PG2 »Combustion SI« is dedicated to the following topics:

  • Ultimate system efficiency
  • Hybrid powertrains
  • Alternative fuels
  • Artificial intelligence in development, big data and digitalisation

And tackles the following lines of research / focuses:

  • Combustion modelling / simulation
  • Combustion processes and fuel preparation
  • Water injection
  • Wall heat transfer
  • Knocking and pre-ignition
  • Particle formation in the combustion chamber
  • Downsizing concepts
Synthetic fuels
Development tools

People & Technology

MTZ worldwide 03/2021

Spark-Ignition Engines – Fundamental Research for Sustainable Individual Mobility

Spark-ignition combustion engines make up a considerable share of the powertrains for individual mobility applications – not just today, but also in the decades to come as a part of electric powertrains. The Research Association for Combustion Engines (FVV) is therefore dedicating numerous research projects to reducing the CO2 emissions from these engines, with a special focus being placed on real-world operation with fuels produced in a CO2-neutral manner.

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Names carry traces of the past

Pioneering spirit

Engine developer Dr André Casal Kulzer likes to break new ground and thus continues the tradition of his family. We met him in the Porsche Museum in Stuttgart-Zuffenhausen, alongside world-famous, iconic vehicles such as the 356, 911 or 917 and many other small exhibits.

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Improving the efficiency of hybrid SI engines

In order to meet future CO2 limits, spark-ignition engine-driven vehicles (ICEV) must consume significantly less fuel. In the FVV „ICE 2025+“ research project, four university institutes from Aachen, Braunschweig, Darmstadt and Stuttgart are investigating various technology options for significantly increasing efficiency. The aim of the self-financed project is to optimise the powertrain system in such a way as to achieve the lowest possible consumption in real world operation. In relation to the new WLTP cycle (World Harmonised Light-duty Vehicles Test Procedure), this means achieving an average power efficiency of around 40 per cent, and even 50 per cent in individual operating points. Today’s passenger car spark-ignition engines achieve the best value of around 37 per cent, on average around 30 per cent. Within the project, new engine technologies are researched in interaction with electrified powertrains and synthetic fuels.

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Water Injection in SI Engines II

Evaluation of the potential und risks of the water injection to increase efficiency and load in spark-ignition engines


High-efficiency H2 SI Engine with Direct Injection

Thermodynamic potential of monovalent Direct Injection turbo-charged H2 SI engine for passenger cars and light-duty vehicles


ICE2030 Ultimate System Efficiency

Limits of SI engine efficiency in hybridised powertrains



Post-oxidation (HC, CO and PM) in the exhaust manifold of SI engines

PG2 »Combustion SI«


Project Management

Ralf Thee

+49 (0) 69 6603 1349
+49 (0) 69 6603 2349

Project & Team Assistance

Sabrina Waldstein

+49 (0) 69 6603 1681
+49 (0) 69 6603 2681

Research Association for Combustion Engines eV

Lyoner Strasse 18
60528 Frankfurt am Main
T +49 69 6603 1345