BMW G12 Product Information page 133

G12￿Driver￿Assistance￿Systems
19.￿Cruise￿Control
equipment￿(OE￿5DF),￿the￿distance￿is￿adjusted￿using￿two￿buttons;￿one￿to￿reduce￿and￿one￿to￿increase
the￿distance.￿In￿vehicles￿with￿the￿Driving Assistant Plus optional￿equipment￿(OE￿5AT),￿the￿distance￿is
adjusted￿using￿the￿rocker￿button.
ACC￿Stop&Go￿calculates￿the￿reference￿distance￿for￿the￿control￿from￿this￿preselection.￿The￿following
distance￿most￿recently￿selected￿is￿saved￿depending￿on￿the￿key￿being￿used.
The￿reference￿distance￿during￿the￿journey￿is￿proportional￿to￿the￿driving￿speed.￿At￿a￿lower￿driving￿speed
and￿at￿standstill,￿the￿proportional￿distance￿to￿the￿driving￿speed￿is￿no￿longer￿used￿for￿the￿ACC￿Stop￿&
Go,￿but￿a￿fixed￿value￿in￿metres.
If￿a￿vehicle￿moves￿into￿the￿driver's￿lane,￿which￿is￿anticipated￿due￿to￿the￿current￿driving￿condition,￿or
if￿the￿driver￿is￿approaching￿a￿vehicle￿driving￿ahead,￿the￿ACC Stop&Go￿function￿discretely￿adapts￿the
speed￿to￿the￿vehicle￿pulling￿in￿or￿vehicle￿ahead.
The￿distance￿control￿uses￿the￿prepared￿object￿data￿with￿the￿highest￿diagnostic￿statistic￿as￿input
variables.￿The￿distance￿control￿takes￿into￿consideration￿the￿following￿situations￿in￿particular:
Maximum￿values￿for￿acceleration￿and￿deceleration:
•
The￿maximum￿values￿for￿acceleration￿and￿deceleration￿of￿the￿ACC￿Stop&Go￿system￿below
about￿50 km/h￿are￿dynamic￿values.￿They￿correspond￿to￿the￿acceleration￿and￿deceleration
values￿that￿the￿driver￿would￿use￿himself￿and￿considers￿comfortable.￿In￿situations￿where
sharper￿deceleration￿is￿required￿than￿the￿system￿offers￿as￿part￿of￿the￿speed￿adjustment
feature,￿a￿visual￿and￿acoustic￿signal￿is￿issued￿to￿the￿driver￿to￿inform￿him￿to￿take￿over￿vehicle
handling.
Depending￿on￿the￿situation,￿the￿ACC￿Stop￿&￿Go￿accelerates￿by￿a￿maximum￿of￿about￿2 m/s²
and￿decelerates￿by￿a￿maximum￿of￿about￿4 m/s².
Stop￿and￿start￿stability:
•
In￿the￿case￿of￿very￿heavy￿traffic￿and￿very￿low￿driving￿speed,￿the￿risk￿of￿rear-end￿collisions
increases￿through￿heavy￿acceleration￿and￿braking.￿The￿ACC￿Stop&Go￿distance￿controller￿is
therefore￿designed￿to￿decelerate￿as￿early￿as￿possible,￿but￿not￿more￿than￿the￿vehicle￿ahead.
The￿system￿can￿decelerate￿by￿up￿to￿2.5 m/s²￿at￿the￿most￿during￿subsequent￿operation,￿and￿by
up￿to￿4 m/s²￿at￿the￿most￿when￿stopping.
Request￿to￿take￿over￿vehicle￿handling
When￿ACC￿Stop&Go￿is￿no￿longer￿able￿to￿maintain￿a￿safe￿distance￿or￿a￿critical￿situation￿is￿detected,
e.g.￿on￿account￿of￿very￿high￿differential￿speeds￿or￿an￿insufficient￿maximum￿deceleration,￿two￿short
warning￿signals￿sound￿and￿the￿orange￿lit￿up￿vehicle￿symbol￿in￿the￿instrument￿cluster￿or￿the￿Head‐Up
Display￿(optional￿equipment￿OE￿610)￿flashes.￿The￿system￿continues￿to￿perform￿its￿control￿function
and￿prompts￿the￿driver￿to￿take￿over￿vehicle￿handling￿and￿to￿keep￿their￿distance￿accordingly.
19.3.2.￿Operation
Activation￿and￿deactivation
The￿activation￿and￿deactivation￿of￿the￿ACC￿Stop￿&￿Go￿and￿the￿Dynamic￿Cruise￿Control￿are￿almost￿the
same.￿ACC Stop&Go￿can￿either￿be￿activated￿while￿driving￿or￿at￿a￿standstill.￿For￿safety￿reasons,￿when
the￿vehicle￿is￿at￿a￿standstill￿the￿function￿can￿only￿be￿put￿in￿Standby￿mode￿or￿deactivated￿while￿the
footbrake￿is￿applied.
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