Exhaust Gas Aftertreatment

Catalyst Design
We optimize catalytic converters in terms of the following properties:

Coating
Cell number
Volume
Foil structure
Wall thickness
Precious-metal load
Precious-metal ratio

Optimization can either take place on the engine test bench and in the vehicle – or by means of catalyst measurement on the synthetic gas test bench, including simulations and empirical data.

Catalyst Aging

Aging through endurance testing in the vehicle
Aging on the engine test bench
Oven-aging in a defined gas atmosphere

An extrapolation can be obtained on the basis of oven-aging and catalyst measurement on the synthetic gas test bench as well as by including simulations and empirical data.

Emission Standards
Standard tests can be carried out at IAV to determine vehicle emissions for all common emission cycles (US, EU, Japan).
The following special measuring techniques are also used for investigating specific aspects:

High-speed temperature measurement (mobile)
High-speed HC analysis (mobile)
Mass spectroscopy
Indication (mobile)

Calibration
A vehicle, for example, is equipped with the following measurement technology:

Indication: evaluation of starting behavior, warm-up, idling and possible operating-mode changeover (stratified-homogeneous / homogeneous-stratified)
High-speed HC analysis: fast FID permits direct assessment of calibration changes in terms of combustion quality and emission behavior, as well as trailing throttle fuel cutoff and fuel feed restart with regard to catalyst aging
High-speed temperature measurement: thermocouples (0.1 mm) permit fast, virtually instantaneous measurement of gas temperature/component temperature after calibration changes
Inca PC: calibration of control-unit variables

Exhaust Gas Aftertreatment

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