temperature requirements of the adhesive do not need to
be high and can have an operating temperature range of
-40 °C to +85 °C to function properly.
As customer demand increases for park distance
control sensors in their vehicles, production processes
will need to speed up. Light-curing epoxy resins fulfill
these demands, allowing for short cycle times in series
production. These resins also provide impressive results
during standard automotive tests like temperature change
and salt spray testing. Light-curing epoxy resins are cured
by preactivation; they are first dispensed and then receive
irradiation, which slowly starts the curing process. Once
this begins, parts are joined, and the polymerization
progresses further, resulting in a quick handling strength.
Sensors are also used as alarm triggers with regard to
tire pressure. They relay information from the tire to
send a signal both visually and acoustically as soon as the
pressure drops and are therefore very important with
respect to safety, fuel efficiency, and wear. The incorrect
tire pressure can create the risk of having an accident by
significantly extending the braking distance or negatively
impacting stability when cornering.
The one-component, heat-curing epoxy resins used here
are for die-attach, as well as sealing and fixing the two-component products for large-volume casting of the PCB.
These resins are especially media-resistant, are repellant
against typical automotive fluids, and can withstand salt
spray and cleaners. They also provide impressive results
in vibration and drop tests. The bonded sensors are put
through everyday situations that a car is exposed to in
extensive, simulated laboratory tests.
Finding the Right Balance
Hall sensors are always applicable when position or speed
need to be captured. These sensors are sometimes located
directly on the wheel rim or the wheel hub. From there,
they provide accurate information on how frequently
the wheel is rotating. In these cases, dual-curing (light/
anaerobic-curing) adhesives are especially appropriate
because they assure a rapid pre-fixation and secure final
curing of the magnet, the magnet holder, and the hall die
even in shadowed areas. The adhesives are highly resistant
to media impacts like oil, gas or even braking fluid and
also pass salt spray tests, reflow tests according to the
semiconductor standardization body (JEDEC), vibration
tests, and drop tests with flying colors.
Just the Right Mix
and are located
in the engine
in the air intake
MAF sensor has
the primary task of communicating the incoming air mass
to the engine control unit. This quantity is needed in both
gas and diesel engines to calculate various parameters.
Figure 2: tire pressure monitoring sensors have been legally
required for some time now.
Figure 3: a hall sensor measures rotation,
among other things.