BMW G12 - Introduction

G12�Driver�Assistance�Systems
19.�Cruise�Control
120
19.1.�Introduction
Two�cruise�control�functions�can�be�used�in�the�G12.�The�cruise�control�with�braking�function�(DCC)
is�part�of�the�basic�equipment.
The�customer�also�has�the�option�of�ordering�the�Active�Cruise�Control�with�Stop&Go�function
(ACCStop&Go)�optional�equipment�(OEZN7)�part�of�ZDT�Driver�Assistance�Plus�II.
ACCStop&Go�can�also�be�obtained�if�the�customer�opts�for�the�Active�Driving�Assistant�Plus�optional
equipment�(OE5AT),�as�it�is�contained�in�this�equipment�package.
Other�features�of�the�Active�Driving�Assistant�Plus�optional�equipment�(OE�5AT)�are�the�steering�and
lane�control�assistant�and�the�traffic�jam�assistant.�When�used�in�conjunction�with�the�steering�and
lane�control�assistant�and�the�traffic�jam�assistant,�ACC�Stop�&�Go�provides�optimum�support�for�the
driver.
The�cruise�control�systems�support�the�driver�with�adapting�the�speed,�distance�and�driving�style�to
the�traffic�conditions,�but�do�not�relieve�him�of�his�responsibility.�The�driver�must�actively�intervene,
e.g.�by�braking,�steering�or�taking�evasive�action,�as�otherwise�there�is�a�risk�of�an�accident.
19.2.�Cruise�control�with�braking�function
The�cruise�control�with�braking�function�is�included�as�part�of�the�G12's�basic�equipment.�The�system
is�also�Known�as�"Dynamic�Cruise�Control"�(DCC).�Dynamic�Cruise�Control�(DCC)�supports�the�driver
on�roads�with�less�traffic�by�keeping�the�speed�constant�irrespective�of�rolling�resistances�(incline,
downhill�driving�and�vehicle�load).�In�spite�of�the�support,�the�driver�remains�responsible�for�control
of�the�vehicle.�It�is�possible�to�override�the�DCC�function�at�any�time�by�braking�or�accelerating�the
vehicle.
19.2.1.�Control�functions
Cruise�control
The�cruise�control�calculates�a�target�acceleration�or�deceleration�based�on�the�speed�set�by�the�driver
and�the�actual�speed.
Acceleration�and�deceleration
The�driver�can�specify�the�set�speed�or�acceleration�via�the�rocker�switch�on�the�multifunction�steering
wheel�(MFL).
Cruise�control�on�bends
Another�purpose�of�this�function,�also�referred�to�as�the�"lateral�acceleration�controller",�is�to�prevent
the�lateral�acceleration�from�increasing�above�an�acceptable�level�when�cornering�with�the�cruise
control�switched�on.�A�lateral�acceleration�is�calculated�from�the�driving�speed�and�yaw�rate.�This�value
is�compared�with�a�speed-dependent�limit�in�order�to�achieve�the�following�seemingly�contradictory
objectives: