Audi Q7 361 - Seat Belt Force Sensor

P a ssenger pr otection
Se at belt f o r c e sen s o r f o r se at occu pie d r e cog n iti o n G453
T h e seat belt f o rce sensor f o r seat occupie d
r e co gniti o n is integ r ated in the fr o n t passeng er seat
belt buc k le . It ba sic a lly consists of tw o par t s which
move i n r e la tion t o one a nothe r an d a Ha ll se nso r ,
which is lo c a ted between the magne t s I and II .
A c a libr a t ed spring ho lds the pa r t s in th e initia l
position. I n this po sitio n the magne t s I and II do no t
a c t on the Hall sens or . When the se at belt is
cor r ectly f a sten ed, a ten s ile f o rce is a pplied at the
belt buc k le .
T h e distanc e between the Hall sensor and mag n ets I
a
nd II c h a n ges. T h e a c tion of the mag n ets on the
Ha ll sen s or an d c o nseq uen t ly th e voltage signal of
the Hall sensor also c h a n ges. T h e higher th e ten s ile
f o rce o n the belt bu c k le, th e mor e the par t s move
t o wa rds one another . T h e seat occupied r e cogn ition
co ntr o l unit r e ceives thi s inf o r m atio n a nd
ev a l u a t e s it .
A me c h anic al st op ensur e s that the s e nsor element
is not t o rn apar t in the eve n t of a cr a s h.
I n it ial p o si tio n Te ns ile f o r c e a pp lie d
Magn et I
H a ll s e nsor
Ma gnet II
Spr i ng
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