Exhaust emissions measurement

Measuring exhaust emissions – a critical factor in developing clean solutions.

Optimizing the emissions from an engine fitted with an aftertreatment system (3-way catalytic converter, diesel particulate filter, SCR catalytic converter, etc.), whether stationary or dynamic, is impossible without a reliable emissions database.

Measuring gaseous emissions

  • We can analyze and record gaseous emissions (NO, NOx, HC, CO, CO2 and NH3) using state-of-the-art multi-line measuring systems
  • Our FTIR systems can detect the intermediate products created as a result of chemical reactions in the catalytic converter
  • We use mass spectroscopy techniques to analyze catalytic reactions in greater detail

Constant Volume Sampling (CVS)

A pre-defined amount of fresh air is added to the exhaust gases in the tailpipe to allow reactions that would also occur in the natural environment. Continuous samples are taken and analyzed in a dynamic test cycle. This represents state-of-the art technology in the field of roller type dynamometers. Applying high-tech tools such

as these to develop engines on the dynamic test bench, ElringKlinger Motortechnik can guarantee that the results will be 100% compatible with the results of your own roller-dyno tests.

Particulate emissions

In order to reduce particulate mass emissions and be able to certify that diesel engines meet stringent U.S. and European emissions legislation, we use full-flow dilution tunnels (for light-duty vehicles) and part-flow dilution tunnels (for HDT engines). State-of-the-art 415S smoke

meters and particulate counters are standard on our test benches. Our highly experienced engineers know exactly how to make best use of these measuring techniques in your development projects.

Particulate counting

When Euro 6 emissions legislation comes into force, the existing requirement to measure particulate mass will be extended to include a measurement of the number of particulates emitted. This is because modern diesel engines produce very tiny particulates which can enter the lungs more easily. On account of their size, they are regarded as a much greater risk to health.

Particulates are counted using a light scattering method. Because they are so tiny (in the single-digit µm range), butanol vapor has to condense on each particle and create a bubble which can then be detected by the light sensor.

This measuring technique is complex, and the testing conditions are highly sensitive. ElringKlinger Motortechnik encases its measuring equipment in air-conditioned housings to guarantee the best possible results.

Particulate counting is part of the certification process for diesel and spark-ignited vehicles. In order to exploit the potential for further optimization, especially in the field of SI engines, the industry needs to make additional refinements to the combustion process and to its exhaust emission aftertreatment systems.