powertrain engineering
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CONCEPT DEVELOPMENT TYPE APPROVAL IN-SERVICE
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The AES/BES and AECD strategy
definitions must be matched with
the powertrain concept and with
the vehicle matrix on basis of the
relevant technology package for
engine and exhaust gas aftertreatment
system. To minimize the risk
of exceeding defined limits in the
field, it is furthermore necessary to
implement frequent quality monitoring
throughout the entire development
process. The preferred
choice of tool for this task is AVL
CRETA™, which is used for data
set management, for AES/BES
and AECD monitoring, and also
for quality monitoring and model
variant management.
Complementing the established
tool chain, the permanent comparison
to a broad AVL-emission
database enables the identification
of possible emission risks in every
phase of the development loop or
process. Additionally, specifically
tailored RDE replacement cycles
are focused on the most relevant
testing tasks and for the most possible
areas of concern. This allows
the validation of the potential for emission robustness at the chassis dyno
testing stage. These activities, known as ‘RDE-Replacement Cycles’ or
‘RDE Reference Cycles’, address all the potential emission risks that result
from the huge variety of traffic situations within a synthetic chassis dyno
test. The creation of such replacement cycles is based on a high number of
representative RDE measurements within the AVL database and a respective
test-generation methodology. This is the most effective approach for
providing solutions for lifetime robustness with reduced time and development
efforts – and it maximizes emission robustness.
“There are numerous influences involved in guaranteeing emissions robustness
throughout the lifetime of the vehicle,” says Enzi. “We have to consider
a variety of topics and some are harder to achieve than others.” To master
the complexities that managing these challenges create, it’s mandatory
to use model-based development tools such as AVL CRUISE M™, which
combine the strength of both empirical and physical models. Within the
development process, CRUISE M employs consistent models with increasing
model refinement, which ensures highly stable results. This approach is
used for concept simulation in the office and for automated OBD testing,
for xCU controls development and validation, and (pre-) calibration for
non-standard environmental conditions, component protection, vehicle/
engine derivates and RDE evaluation (SiL, HiL or VTB – Virtual testbed).
Additionally, the virtual environment is used for validation tests as a continuous
companion throughout the whole calibration process, for robustness
and production tolerance investigations and it takes into account system
interactions.
At AVL we provide solutions that support our customers in mastering the
development complexity and the trade-off between CO2 efficiency and
emission compliance including lifetime robustness.
Concept Road testing
QUALITY MONITORING
Propulsion testing
HiL testing
Powertrain testing
Road Testing
Legal requirements
(AES/BES, AECD)
Simulation
(Cruise M)
Powertrain
elements
Elements
Testing
Vehicle testing
Simulation
Simulation
Simulation
AVL Toolchain across
the development process
DATA AND DOCUMENTATION ¢ CRETA data set management, AES/BES monitoring, quality monitoring (gate process), variant management
TESTING METHODOLOGY ¢ test matrix, replacement cycle, CET = Concerto Evaluation Tool, functional durability test, customer oriented test
EVALUATION METHODOLOGY ¢ statistical evaluation, emission data base
SIMULATION METHODOLOGY ¢ model based development and evaluation, virtual testbed