Automotive Engineering - June 2021 - 7

TECHNOLOGY REPORT
vehicle.' " Bultel pointed out that odor
testing will only become more critical
as more shared and autonomous vehicles
enter automotive fleets.
Using thermal desorption
The device at the center of Aryballe's
testing is the TD-SPRi sensor, a coupled
thermal-desorption based amplifying
device which increases the intensity of
a compound's olfactory signature up to
400 times. Using this device, Bultel said
they are focusing on conditions set
forth in the VDA 270 standard's third
variant, which heats materials to 80°C
(176°F) for two hours. From the sampling,
Bultel noted they are able to derive
a Clustering Quality Score (CQS)
based on intra- and inter-cluster ratios
to provide a metric for discrimination
performance between compounds.
" We say that a good nose is able to
discriminate between two wines. And
this is a metric to give a level of perforThe
current olfaction process involves both extensive lab testing of materials, as well as subjective
ratings by trained human noses.
mance on how an electronic nose is
able to separate between compounds, "
Bultel said. " It gives you a visual aspect
of how we separate those compounds.
It's visual feedback.
" But we also need numerical values
to say, 'How far are they, one to each
other,' and to give a threshold of pass or
not pass. That's why we developed the
CQS for clustering this score based on
intra-cluster and inter-cluster ratios, " he
explained. " So the further the clusters
ICU
HV Connector
(Integrated
Central control Unit)
BFA
HV/LV Wiring Harness
Built-in Cam
Battery Disconnect Unit
(Busbar Frame Assembly)
HV Junction
Block
HV Charging
Coupler
AUTOMOTIVE ENGINEERING
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June 2021 7
ARYBALLE
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Automotive Engineering - June 2021

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