ATC
AS C+T/DS C
189n
In o rd e r to ta ke d rivin g c ond itio ns in to
a c c ount, ATC re gis te rs c orn e rs a nd
b oth u p hill a nd d ownhill gra d ie nts . Fo r Fo r in s ta nc e , th e s ys te m re c ognize s
e xa m p le , if yo u m a inta in s p e e d th ro ugh s to p -a nd -go tra ffic a nd th e n p ro c e e d s
a c urve , th e tra ns m is s ion d oe s n ot u p -
s hift.
By re c ognizing tra ffic c ond itio ns , ATC
c a n re ta in m a xim um d rivin g c om fort.
P re c is ion s e ns ors m onito r th e w he e l
s p e e d s . Th e DS C a ls o m onito rs s te e r-
ing a ngle , la te ra l a c c e le ra tio n, b ra ke
p re s s ure a nd th e m ove m e nt o f th e ve hi-
c le a ro und its ve rtic a l a xis .
only in s e c ond g e a r u ntil it e nc ounte rs
highe r s ta rtin g lo a d s .
If d iffe re nc e s in w he e l s p e e d s o c c ur,
On u p hill gra d ie nts , it s hifts o nly w he n
th e e ngine s p e e d in c re a s e s in o rd e r to
m a ke m ore e ffic ie nt u s e o f p owe r re -
s e rve s . O n d ownhill gra d ie nts , ATC
s hifts d own w he n th e s p e e d o f th e ve hi-
c le s in c re a s e s , c a us ing th e d rive r to
s te p o n th e b ra ke s .
Of c ours e , th e s e le c to r le ve r c a n s till b e th e s ys te m re c ognize s th e d a nge r o f
us e d to s e le c t s p e c ific g e a r ra tio s . P e r- whe e ls p in a nd re d uc e s th e e ngine 's
form a nc e -orie nte d d rivin g is e na b le d b y d rive to rq ue . If n e c e s s a ry, th e s ys te m
s hifting fro m d rive p os itio n "D" to "S ,"
a ls o re s p ond s w ith a d d itio na l b ra kin g
inte rve ntio n a t a ll fo ur w he e ls .
"3
" o r "2 ." P os itio ns "3 " a nd "2 " e a c h
lim it u p s hifts to th e n e xt g e a r. P os i-
tio n "2 " is b e s t fo r d rivin g o n s te e p
m ounta in s lop e s w ith a h e a vy lo a d .
In a d d itio n, DS C p e rm a ne ntly m onito rs
th e ve hic le 's c urre nt o p e ra tin g c ond i-
tio n a nd c om p a re s it w ith a n id e a l c on-
d itio n th a t is c a lc ula te d fro m th e s e ns or
s igna ls . If d is c re p a nc ie s fro m th is id e a l
c ond itio n (und e rs te e ring o r o ve rs te e r-
ing, fo r e xa m p le ) o c c ur, DS C s ta b ilize s
th e ve hic le in fra c tio ns o f a s e c ond b y
re d uc ing e ngine p owe r o utp ut a nd w ith
th e a s s is ta nc e of b ra kin g inte rve ntio n a t
ind ivid ua l w he e ls . Da nge ro us s kid s a re
th us p re ve nte d fro m th e ve ry b e ginning.
With re s p e c t to ro a d c ond itio ns , ATC
m onito rs th e fric tio n b e tw e e n th e tire s
a nd th e ro a d . Th e s ys te m re s p ond s to
s lip p e ry ro a d s urfa c e s (s now a nd ic e )
b y a c tiva tin g th e w inte r p ro gra m .
S e c ond g e a r is u s e d w he n m oving
a wa y fro m a s ta nd s till, u p s hifts o c c ur
s oone r. O n d e s c e nts , d owns hifting
d oe s n ot o c c ur in s p ite o f th e a p p lic a -
tio n o f b ra ke s . Th is e na b le s yo u to
"fe e l" th e ro a d a s yo u d rive a nd p ro -
d uc e s g re a te r d yn a m ic s ta b ility. If th e
fric tio n b e tw e e n th e tire s a nd th e ro a d
is a d e q ua te , th e norm a l s ys te m is a ga in
a c tiva te d . Th e s ys te m a ls o le a ve s th e
winte r p ro gra m w he n yo u s hift fro m
d rive p os itio n "D" to "S ," "3 " o r "2 ," o r if
th e AS C+T/DS C* is d e a c tiva te d .
You m a y n e e d s om e tim e to b e c om e
a c c us to m e d to th is s ys te m inte rve ntio n.
Ho we ve r, it h e lp s p ro vid e o p tim um p ro -
p uls ive fo rc e a nd d rivin g s ta b ility.
The b ra kin g in te rve ntio n m a y b e a c -
c om p a nie d b y a c e rta in d e gre e o f
nois e .
Online Edition for Part No. 01 41 0 004 597 - © 08/99 BMW Group
| Categories | BMW 7-Series Manuals, BMW Manuals |
|---|---|
| Tags | BMW 740i, BMW 740iL, BMW 750iL, BMW E38 |
| Model Year | 2001 |
| Download File |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
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