Technology Profile |
Increasing WIM accuracy
and system robustness
Kistler is presenting its new
Weigh-In-Motion (WIM)
system KiTraffic Digital
to the public at Intertraffic 2020
(Amsterdam 21-24 April, booth
10.308). It is the first system of
its kind without an induction
loop: the sensor itself registers
when a vehicle needs to be
measured. This reduces
installation efforts and increases
the reliability of the WIM site.
With an accuracy of up to 2%,
KiTraffic Digital is the most
accurate WIM system to date.
Reducing the hardware in
a measuring chain reduces the
likelihood of component failure
or uncertainties. The quartz
WIM sensors themselves are
generally extremely robust and
maintenance free; the reliability
of the system depends on the
operation availability of the
electronics. This is where the
new WIM System from Kistler
comes into play: it does not
require induction loops and
works with only one robust
cable per sensor. The same
ethernet cable that transmits
the digital signal from the
WIM sensors also provides
them with power. This
simplifies the installation and
further improves the overall
robustness of the system.
Multiple quartz crystals
With KiTraffic Digital, Kistler
is also launching the most
accurate WIM system to date –
independent of almost all
external factors, such as driving
maneuvers or road conditions.
The entirely new sensor used
in KiTraffic Digital incorporates
multiple quartz crystals that
autonomously deliver data via
a digital interface. This allows
for the individual calibration
of each crystal. Mechanical
irregularities therefore do not
impact on the accuracy of the
measurement. The digital signal
Top: The system
is easily installed
Left: Kistler’s road
analysis easily
finds ideal WIM
locations
| Need to know surface and deeper
Characteristics of the
KiTraffic Digital system
066 Traffic Technology International March/April 2020
www.TrafficTechnologyToday.com
> The quartz WIM sensors
are extremely robust and
maintenance free
> At 2%, the system is the
most accurate to date
> Enables the calibration
of each quartz crystal,
significantly improving
sensor accuracy
> Features a graphical webbased
user interface and
can easily be integrated
in higher level systems
underground structure are
measured using advanced
methods to detect even minor
irregularities. Road engineers
at Kistler consolidate and
process the assembled data
with the help of a specialized
simulation software to find the
ideal spot for the installation.
Following this in-depth road
and pavement inspection, the
generated data can also be
taken into account to calibrate
the KiTraffic Digital sensors
more precisely.
is also very robust against noise
(e.g. from high voltage power
lines), which allows robust
signal transmission.
Sophisticated algorithms
calculate the wheel, axle and
total weight of the vehicle.
Going deeper underground
Road surface, underground
structure and geometry have
a significant influence on the
accuracy and robustness of
WIM systems. A new service
offered by Kistler, the Structural
Road Analysis (SRA), identifies
the ideal location for a planned
WIM installation on any given
road, improving measurement
quality and ensuring the longest
possible lifespan for the WIM
installation. As part of this
service, Kistler evaluates
the geometry of the site and
the road itself. Next, the road
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Kistler
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