The limits for nitrates in diesel engine
emissions defined by international standards are becoming increasingly
strict. Compliance with these limits requires electronic controls for
catalytic converters. Selective catalytic reduction (SCR) systems that
use urea injection (with AdBlue) are said to be an effective solution.
Simulating the control algorithms plays a vital role in the development
of these systems.
The dSpace ASM Diesel Exhaust Model, one of the
Automotive Simulation Models (ASMs), provides a complete virtual diesel
exhaust aftertreatment system. In addition to the submodel for urea
injection (the SCR system), it includes further submodels for a diesel
oxidation catalyst (DOC) and a diesel particle filter (DPF). The
simulation model can be used throughout the development process, from
controller design in Simulink to ECU testing on a dSpace simulator.
The vendor points out that users have complete access to all its
Simulink blocks. They benefit from being able to view the modeled
functions and adapt them to specific requirements themselves. The
exhaust model's individual components (DOC, DPF, SCR) can be combined in
different ways and optimally configured for the aftertreatment system
The model can be used to represent the essential physical and
chemical processes in modern aftertreatment systems: urea decomposition
for catalytic reduction, fuel post-injections for catalytic oxidation,
soot particle filtering and DPF regeneration. It contains AdBlue dosing
systems with and without air supply and simulates temperature, pressure
and lambda sensors.
For further information, please visit www.dspace.de