ENGINES | Planning Group 6 »Emissions & Immissions«

Combustion generally means the oxidation of a material with oxygen while forming flames. If the material is not converted completely, emissions are generated. If the engine runs on fossil fuels, these are unburnt hydrocarbons, carbon monoxide, nitrogen oxides and particles, which are carried into the environment as immissions. In order to minimise these effects, the planning group is researching how the combustion itself can be as clean as possible, as well as investigating the aftertreatment of exhaust gases with oxidation catalysts, particulate filters and SCR catalysts that reduce nitrogen oxides.

» The research work coordinated within FVV brings together the knowledge of engineers, physicists and chemists. «

Dr. Volker Schmeißer (Daimler Truck)

The initial starting point of engineering work is always preventing the formation of exhaust pollutants even during the combustion process. Exhaust gas aftertreatment systems are then only used if this proves unsuccessful. Due to ever more stringent exhaust regulations, the FVV researchers are pursuing both paths simultaneously.

Collaborative research is especially important here, as there are complex interrelationships between the two approaches. Nitrogen oxides are an example of this: the hotter and therefore more effective the combustion is, the more nitrogen molecules react with the atmospheric oxygen. Engine developers can counteract this by recirculating part of the exhaust gas to the combustion chamber to lower the combustion temperature. Because the exhaust gas is removed from the catalyst, however, residual materials such as particles or unburnt hydrocarbons can cause deposits in the radiator. In a range of research projects, the planning group is investigating the solution to problems such as this, for example through an optimised flow velocity of the exhaust gas.

PG6 »Emissions & Immissions« is dedicated to the following topics:

  • Emissions for new powertrain concepts
  • Alternative fuels
  • Fluctuating operating strategies and their effects
  • New materials in components that come into contact with exhaust gas

And tackles the following lines of research / focuses:

  • Purification and reduction of exhaust gas, alternative means of reduction
  • Modelling approaches for reaction kinetics on the catalyst
  • Local condition monitoring of emissions
  • High-resolution online measuring techniques
  • Lifespan of exhaust gas purification components
  • Non-regulated exhaust gas components
Development tools
Synthetic fuels

People & Technology

MTZ worldwide 2021/01

Investigations on the Deposit Formation and Decomposition from Urea in SCR Systems

Long-term reliability and high conversion rates are major criteria for engine exhaust aftertreatment with selective catalytic reduction by a Urea-water Solution. Unfavorable operating conditions may lead to the formation of solid deposits which degrade the system efficiency. Within the framework of the FVV project no. 1262, at the Karlsruhe Institute of Technology (KIT) and the Vienna University of Technology (TUW), fundamental experimental and numerical investigations on deposit for mation and decomposition were carried out.

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MTZ worldwide 04/2020

Deposit formation on diesel oxidation catalysts

Deposits on components of the Exhaust Aftertreatment (EAT) are often only detected after the failure of the respective component. Within the FVV project EAT Clogging (FVV project no. 1271), the Technical University of Braunschweig investigated which parameters have an impact on deposit formation and in which stages this takes place. The investigations include dynamic endurance runs and stationary tests.

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MTZ worldwide 07-08/2018

Advanced exhaust gas aftertreatment

Exhaust gas from modern combustion engines is cleaner than ever before. Current projects of the Research Association for Combustion Engines (FVV) show that exhaust emissions can be reduced even further, especially in real operation. At the same time, electrification and the introduction of alternative fuels impose new requirements to exhaust gas aftertreatment.

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Zero Impact Tailpipe Emission Powertrains

Identify technical solutions to achieve powertrains with Zero Impact Tailpipe Emissions un-der consideration of a 2030+ legislative vehicle and air pollutant scenario


Impact of New Silica-containing Fuels on Exhaust Gas Aftertreatment Components

Risk mitigation of dramatic poisoning of SCR catalysts and sensors caused by upcoming marine hybrid fuels, Ultra Low Sulfur Fuel Oil (ULSFO)


2030+ Requirements on Emission Control Systems - MD/HD

Provide future framework (chemical/thermohydraulic) for the design of prospective emission control systems in drivetrains for medium & heavy-duty trucks and nonroad machinery in 2030+



Low-temperature NOx reduction by H2 in the exhaust of diesel engines

PG6 »Emissions & Immissions«

Dr. Volker Schmeißer
Daimler Truck

Project Management

Max Decker

+49 (0) 69 6603 1177
+49 (0) 69 6603 2177

Project & Team Assistance

Daniela Abdalla

+49 (0) 69 6603 1345
+49 (0) 69 6603 2345

Research Association for Combustion Engines eV

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