2017 Citroen GRAND C4 PICASSO RHD engine

159
Dynamic cruise control
System that allows, in addition to maintaining your vehicle's speed at a value that you have defined, the inter-vehicle time you have selected between
your vehicle and the one in front to be maintained.
Principles of operation
Using a radar with a range of about 100 metres,
located at the front of the vehicle, this system
detects a vehicle running in front of your
vehicle.
It automatically adapts the speed of the vehicle
to that of the vehicle in front.
If the vehicle in front is running more slowly,
the system progressively reduces the speed of
your vehicle using just engine braking (as if the
driver had pressed the "-" button).
If your vehicle is too close to or approaching
the vehicle in front too quickly, the dynamic
cruise control is automatically deactivated.
The driver is then alerted by an audible signal,
accompanied by a message.
Choice of the type of cruise control
The choice between the "dynamic" and
"standard" cruise control is done in the Driving
menu.
F

I
n the Driving menu, select the " Driving
function " tab, then " Cruise control
active " to activate or deactivate the
dynamic cruise control.
For more information on the Cruise
control , refer to the corresponding
section. F

P
lace the cruise control
thumbwheel at "CRUISE". If the vehicle in front accelerates or changes
lane, the dynamic cruise control progressively
accelerates your vehicle to return to the
programmed speed.
If the driver operates a direction indicator to
the left (left-hand drive) or the right (right-
hand drive), to overtake a slower vehicle, the
dynamic cruise control allows your vehicle to
temporarily approach the vehicle in front to
assist the overtaking manoeuvre, though never
exceeding the programmed speed.
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The dynamic cruise control is switched on
manually: it requires that the speed of the
vehicle be between 25 and 90 mph (40 and
150
km/h), as well as the engagement of:
-

f
ourth gear or higher with a manual
gearbox,
-

s
econd gear or higher with an automatic
gearbox in manual mode,
-
position D with an automatic gearbox.
The system remains active after changing gear
on vehicles with a manual gearbox and Stop &
Start.
General points
The dynamic cruise control can be paused
manually or automatically:
-

b
y pressing button 4 ,
-

b
y pressing the brake pedal,
-

i
n the event of operation of the ESC, for
safety reasons,
-

i
n the event of operation of the electric
parking brake control lever,
-

w
hen an inter-vehicle time threshold is
reached (calculated according to the
relative speeds of your vehicle and the
vehicle in front and the inter-vehicle time
setting chosen),
-

w
hen the distance between your vehicle
and the one in front becomes too small,
-

w
hen the speed of the vehicle in front is
too


low,
-

w
hen the speed of your vehicle becomes
too low.
The dynamic cruise control cannot in any
circumstances replace the observation
of speed limits, nor the need for vigilance
on the part of the driver.
It is recommended that you always keep
your feet close to the pedals. If the speed setting selected is above
90 mph (150 km/h), the system switches
to standard cruise control operation,
with no adjustment of the inter-vehicle
safe distance (a message appears in
the instrument panel). The inter-vehicle time setting is kept in
memory on switching off the ignition.
The dynamic cruise control operates by
day and at night, in fog or in moderate
rainfall.
The system does not act on the braking
system, but works only with engine braking.
The regulation range is limited: there will
no longer be any adjustment of speed if the
difference between the programmed speed
setting and the speed of the vehicle in front
becomes too high (18 mph (30 km/h)).
If the difference between the
programmed speed setting and the
speed of the vehicle in front is too
great, the speed cannot be adjusted:
the cruise control is automatically
deactivated.
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163
SymbolDisplay in the
instrument panel Associated message
Comments
No vehicle detected:
the system operates as a standard cruise control.
Detection of a vehicle, at the limit of the range of the radar:
the system operates as a standard cruise control.
"SPEED ADJUSTED" Detection of a vehicle that is too close or running at a speed lower than your
vehicle's cruise speed setting.
The system uses engine braking to slow your vehicle and then hold it at the speed of
the vehicle in front so as to maintain the programmed inter-vehicle time.
The regulation range is limited to a maximum difference of 20 mph (30 km/h)
between the speed setting and the speed of the vehicle ahead.
"SPEED ADJUSTED" When the adjusted speed reaches the control limit (speed setting - 20 mph
(30
km/h)), the adjusted speed flashes together with the speed setting, to signal that
automatic deactivation of the system is imminent.
"Cruise control
paused" If the system exceeds the limit of speed adjustment possible by the system and
in the absence of any reaction by the driver (operation of the direction indicator,
change of lane, reduction of the speed of the vehicle), the system is automatically
paused.
The display of the deactivation message is accompanied by an audible signal.
Driving situations and associated alerts
The table below describes the alerts and the messages displayed for the different driving situations.
The display of these alerts is not sequential.
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When the dynamic cruise control is
automatically paused, it can only be
reactivated when safe conditions are
restored. The message "Activation
not possible, conditions unsuitable"
is displayed while reactivation is not
possible.
When the conditions allow, it is
recommended that the system be
reactivated by pressing button 2 or 3,
which will make the current speed of
your vehicle the new cruise speed
setting, rather than by pressing button 4
(on/pause) which reactivates the system
using the old cruise speed setting,
which may be very different from the
current speed of your vehicle. The dynamic cruise control uses only engine
braking to slow the vehicle. Consequently the
vehicle loses speed slowly, as when releasing
the accelerator pedal.
The system is paused automatically:
-

i
f the vehicle in front slows down too much
or too suddenly, and the driver does not
brake,
-

i
f a vehicle comes between your vehicle
and the vehicle in front,
-

i
f the system does not slow the vehicle
enough to continue to maintain a safe
distance, for example when descending a
steep hill.
Limits of operation
As the radar's field of view is quite narrow, it is
possible that the system may not detect:
The cruise control does not take account of:
-
s

tationary vehicles,
-

v
ehicles driving in the opposite direction.
-

v
ehicles of reduced width, such as
motorcycles,
-

v
ehicles not running in the middle of the
lane,
-

v
ehicles entering a corner,
-

v
ehicles changing lane at the last moment.
The regulation range is limited to a maximum
difference of 20 mph (30 km/h) between the
speed setting and the speed of the vehicle in
front. Above this, the system goes into pause if
a safe distance is not maintained.
Severe weather conditions (very heavy
rain, accumulations of snow in front
of the radar) can inter fere with the
operation of the system, resulting in
the display of the message "SYSTEM
INACTIVE: Visibility reduced". The
function remains unavailable until the
message disappears.
Driving

166
Dynamic cruise control with Stop function
The dynamic cruise control is a driving
aid that cannot in any circumstances
replace the observation of speed limits
and safe distances, nor the need for
vigilance on the part of the driver.
It is recommended that you always keep
your feet close to the pedals.
The driver must be ready to take back
control of their vehicle at any time,
using the brake or accelerator pedal as
appropriate.
This system provides two functions:
-

a

utomatic regulation of the speed of the
vehicle to a value programmed by the
driver,
-

a

utomatic adjustment of the distance
between your vehicle and the vehicle
ahead, even to the point of stopping your
vehicle completely.
It manages the acceleration and deceleration
of the vehicle by automatically acting on the
engine and the braking system.
To do this, the system has a radar, located in
the front bumper.
Principles
This system detects a vehicle running in front of
your vehicle, travelling in the same direction.
It automatically adapts the speed of your
vehicle to that of the vehicle in front, to maintain
a constant distance.
If the vehicle in front is running more slowly, the
system slows, or even stops your vehicle, using
engine braking and the braking system.
If the braking system is used to decelerate the
vehicle, the brake lamps come on.
If the vehicle in front accelerates or changes
lane, the cruise control progressively
accelerates your vehicle to return to the
programmed speed.
If the driver operates a direction indicator to
overtake a slower vehicle, the dynamic cruise
control allows your vehicle to temporarily
approach the vehicle in front to assist the
overtaking manoeuvre, though never exceeding
the programmed speed.
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169
When the cruise control is paused,
it can only be reactivated when all of
the safety conditions are met. The
message "Activation not possible,
conditions unsuitable" is displayed while
reactivation is not possible.
Wait until the speed of the vehicle
is close to the speed setting before
reactivating the system - by pressing
button 2 or 3 - in order to set your
current speed as the new speed setting.
Modification of the speed setting
Modification from the speed limit
recognition system
F The speed to be memorised is displayed in the instrument panel.
F

M
ake an initial press on button 5 ; a
message is displayed to confirm the
memorisation request.
F

P
ress button 5 again to save the suggested
speed.
The speed is then displayed in the instrument
panel as the new speed setting.
As a precaution, it is recommended that
you select a cruise speed setting close
to the current speed of your vehicle, so
as to avoid any sudden acceleration or
deceleration of the vehicle.
For more information on Speed limit
recognition
, refer to the corresponding
section.
Engine running and cruise control on (green),
you can modify the speed setting.
Modification from the current
speed
F By successive short presses on button 2
or 3, to raise or lower the setting in
steps of + or - 1 mph (km/h),
F

B
y a maintained press on button 2 or 3 ,
to raise or lower the setting in steps of +
or
- 5 mph (km/h).
Take care: a prolonged press on
button
2 or 3 will cause a very quick
change in the speed of your vehicle.
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Modification of the inter-vehicle distance setting
Three predefined inter-vehicle distance settings
are offered:
-
"
Distant" (3 dashes),
-

"
Normal" (2 dashes),
-

"
Close" (1 dash). Engine running and cruise control selected
(grey), you can modify the inter-vehicle
distance setting:
F

p
ress button 6 to display the selection
screen for inter-vehicle distance,
F
p
ress button 6 repeatedly to cycle through
the predefined settings.
The selection screen closes after a
few seconds.
The modification is then taken into account.
This setting remains in memory, whatever the
state of the system and when the ignition is
switched off.
It is possible to exceed the speed setting
temporarily by depressing the accelerator
pedal.
The cruise control no longer manages the
braking system during this period.
Simply release the accelerator pedal to return
to the programmed speed.
If the programmed speed setting is exceeded,
the display of the speed setting disappears
and a message "Cruise control suspended"
is displayed until the accelerator pedal is
released.
Exceeding the programmed
setting
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176
Limits of operation
In the following cases, it is recommended
that the system be deactivated in the vehicle
configuration menu:
-
w
hen towing a trailer or caravan,
-

w
hen carrying long objects on roof bars or
a roof rack,
-

b
efore using an automatic car wash, with
the engine running,
-

b
efore placing the vehicle on a rolling road
in a workshop,
-

w
hen the vehicle is being towed, with the
engine running,
-

w
hen a "space-saver" type spare wheel is
fitted (depending on version),
-

f
ollowing impact damage to the windscreen
close to the detection camera,
-

i
f the front bumper has been damaged,
-

i
f the brake lamps are not working.Because of limits in the operation of the
system, it is possible that warnings are
not given, are given too late or seem
unjustified.
Consequently, the driver must always
remain attentive and able to react at any
time to avoid an accident. Where the speed of your vehicle is too
high approaching another vehicle, the
first level of alert may not be displayed:
the level 2 alert may be displayed
di r e c t l y.
Important:
the level 1 alert is never
displayed if the " Close" threshold has
been selected.
Collision Risk Alert
Depending on the degree of risk of collision
detected by the system and the alert threshold
chosen by the driver, different levels of alert can be
triggered and displayed in the instrument panel.
Level 1: visual alert only, signalling
to you that the vehicle in front is very
close.
The message " Vehicle close" is
displayed.
This level of alert is based on the inter-vehicle
time between your vehicle and the vehicle in
front.
Level 2: visual and audible alert,
warning you that a collision is
imminent.
The message " Brake!" is displayed.
This level of alert is based on the time before
collision. It takes account of the vehicle
dynamics, the speed of your vehicle and the
one in front, the environmental conditions, the
operation of the vehicle (cornering, pedals
pressed, etc.) to trigger the alert at the best
moment.
Modifying the alert trigger
threshold
This threshold determines how you wish to be
warned of the presence of a vehicle moving
or stationary in front of you, or a pedestrian
present in your traffic lane.
The current threshold can be modified only via
the Driving menu in the touch screen.
You can select one of three thresholds:
-
"Distant ",
-
"Normal ",
-
"Close ".
The last threshold selected is kept in memory
when the ignition is switched off.
Driving