Volvo V90 Recharge Plug-in Hybrid (2021 year). Manual in english — page 20

Messages for City Safety (p. 365)

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Subfunctions for City Safety

City Safety

can help to prevent a collision

or reduce the collision speed. The function
consists of several subfunctions.

Ability to reduce speed

If the speed difference between the driver's
car and the obstacle is greater than the follow-
ing specified speeds, the City Safety auto-
brake function cannot prevent a collision but it
can mitigate the consequences of a collision.

Vehicles

For a vehicle in front, City Safety can reduce
the speed by up to 60 km/h (37 mph).

Cyclists

For a cyclist, City Safety can reduce the speed
by up to 50 km/h (30 mph).

Pedestrians

For a pedestrian, City Safety can reduce speed
by up to 45 km/h (28 mph).

Large animals

In the event of a risk of a collision with a large
animal, City Safety can reduce the car's speed
by up to 15 km/h (9 mph).

The brake function for large animals is primar-
ily intended to reduce the force of the impact
at higher speeds and is most effective at
speeds above 70 km/h (43 mph) but less
effective at lower speed.

The steps of City Safety

City Safety carries out three steps in the fol-
lowing order:

1. Collision warning
2. Brake support
3. Auto Brake

The function is not available in all markets.

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DRIVER SUPPORT

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354

1 - Collision warning

The driver is first warned of a potentially immi-
nent collision.

In cars equipped with a head up display

, the

warning is shown on the windscreen by a
flashing symbol.

Symbol for collision warning on the windscreen

Strong sunlight, reflections, extreme light
contrasts, the use of sunglasses, or if the
driver is not looking straight ahead may
make the visual warning signal in the wind-
screen difficult to recognise.

City Safety can detect pedestrians, cyclists or
vehicles that are stationary or moving in the
same direction as the car and are ahead. City
Safety can also detect pedestrians, cyclists or

large animals that are crossing the road in
front of the car.

In the event of a risk of collision with a pedes-
trian, larger animal, cyclist or vehicle, the
driver is alerted by means of a visual, acoustic
and brake pulse warning. There is no brake
pulse warning at lower speeds, sudden driver
braking or acceleration. The brake pulse fre-
quency varies according to the car's speed.

2 - Brake support

If the risk of collision has increased further
after the collision warning then the brake sup-
port is activated.

Brake support reinforces the driver’s braking
action if the system considers that the braking
is not sufficient to avoid a collision.

3 - Auto Brake

The automatic brake function is activated last.

If in this situation the driver has not yet started
to take evasive action and the risk of collision
is imminent then the automatic braking func-
tion is deployed - this takes place irrespective
of whether or not the driver brakes. Braking
then takes place with full brake force in order
to reduce collision speed, or with limited brake
force if it is sufficient to avoid a collision.

The seatbelt tensioner can be activated in con-
nection with the engagement of the automatic
brake function.

In some situations, the action of Auto-brake
may begin with light braking and then pro-
gress to full brake action.

When City Safety has prevented a collision
with a stationary object, the car remains sta-
tionary in anticipation of positive action by the
driver. If the car has been braked to avoid colli-
sion with a slower vehicle in front, its speed is
reduced to match that of the vehicle in front.

On cars with manual gearbox, the engine
stops when the Auto-brake function has
stopped the car, unless the driver has man-
aged to depress the clutch pedal before-
hand.

The driver can always interrupt a braking inter-
vention by firmly depressing the accelerator
pedal.

When City Safety brakes, the brake lights
come on.

When City Safety is activated and brakes the
vehicle, the driver display shows a text mes-
sage to the effect that the function is/has
been active.

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DRIVER SUPPORT

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* Option/accessory.

355

WARNING

City Safety must not be used by the driver

to change his/her driving style - the driver

must not rely on City Safety alone and

allow it to do the braking.

Related information

•

City Safety in cross traffic (p. 358)

•

•

City Safety brakes for oncoming vehicles
(p. 361)

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Seatbelt tensioner (p. 52)

•

Head-up display

(p. 140)

•

Setting the warning distance for

City Safety

is always activated, but the

driver can select the warning distance for the
function.

The City Safety function cannot be deacti-
vated. It is activated automatically when
the engine/electric operation is started and
remains switched on until the engine/elec-
tric operation is switched off.

The warning distance determines the sensitiv-
ity of the system and regulates the distance at
which a visual, acoustic and brake pulse warn-
ing should be deployed.

To select warning distance:

1. Select

Settings

My Car

IntelliSafe

in the centre display's top view.

2. Under

City Safety Warning

, select either

Late

Normal

Early

to set the desired

warning distance.

If the

Early

setting produces too many warn-

ings, which could be perceived as irritating in
certain situations, the

Normal

Late

warn-

ing distance can be selected.

When warnings are perceived as being too
frequent or disturbing, the warning distance
can be reduced, which reduces the total num-
ber of warnings and instead leads to City
Safety giving a warning at a later stage.

The

Late

warning distance should therefore

only be used in exceptional cases, as in
dynamic driving.

The function is not available in all markets.

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DRIVER SUPPORT

* Option/accessory.

356

WARNING

•

No automatic system can guarantee
100% correct function in all situations.
Therefore, never test City Safety by
driving at people, animals or vehicles -
this may cause severe damage and
injury and risk lives.

•

City Safety warns the driver when
there is a risk of a collision, but it can-
not shorten the driver’s reaction time.

•

Even if the warning distance has been
set to

Early

warnings could be per-

ceived as being late in certain situa-
tions, e.g. when there are large differ-
ences in speed or if vehicles ahead
suddenly brake heavily.

•

With the warning distance set at

Early

the warnings will come more in
advance. This may mean that the warn-
ings come more frequently than at the
warning distance

Normal

, but it is rec-

ommended since it can make City
Safety more effective.

Related information

•

•

•

Rear Collision Warning

(p. 372)

Detection of obstacles with City

Safety

City Safety

can help the driver to detect

vehicles, cyclists, large animals and pedes-
trians.

Vehicles

City Safety detect most vehicles that are sta-
tionary or moving in the same direction as the
driver's own car. This function can also detect
oncoming vehicles and cross traffic in certain
cases.

In order that City Safety shall be able to detect
a vehicle in the dark, the vehicle's front and
rear lights must be working and clearly illumi-
nated.

Cyclists

Examples of what City Safety interprets as a cyclist

— with clear body outline and bicycle outline.

Good performance requires that the system
function that detects a cyclist must receive the
clearest possible information about the body
and bicycle outline, requiring the ability to
identify the bicycle, head, arms, shoulders,
legs, upper and lower body plus a normal
human pattern of movement.

If large parts of the cyclist's body or bicycle
are not visible to the function's camera then
the system cannot detect a cyclist.

For the function to be able to detect a cyclist,
he/she must be an adult and riding a bicycle
designed for adults.

The function is not available in all markets.

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357

WARNING

City Safety is supplementary driver sup-

port, but it cannot detect all cyclists in all

situations and, for example, cannot see:

•

partially obscured cyclists.

•

cyclists if the background contrast for
the cyclists is poor.

•

cyclists wearing clothing that obscures
the body outline.

•

bicycles loaded with large objects.

Warnings and brake interventions could be

late or not occur at all. The driver is always

responsible that the vehicle is driven cor-

rectly and with a safety distance adapted

to the speed.

Pedestrians

Examples of what the system regards as pedestrians

with clear body outlines.

Good performance requires that the system
function that detects a pedestrian must
receive the clearest possible information about
the body outline, requiring the ability to iden-
tify the head, arms, shoulders, legs, upper and
lower body plus a normal human pattern of
movement.

In order that it shall be possible to detect a
pedestrian there must be a contrast with the
background and this will be affected by such
things as clothes, the background and the
weather. With poor contrast the pedestrian
may either be detected late or not at all, which
may mean that warnings and braking are late
or omitted.

City Safety can also detect pedestrians in the
dark if they are illuminated by the car's head-
lamps.

WARNING

City Safety is supplementary driver sup-

port, but it cannot detect all pedestrians in

all situations and, for example, cannot see:

•

partially obscured pedestrians, people
in clothing that hides their body con-
tour or pedestrians shorter than 80 cm
(32 in.).

•

pedestrians if the background contrast
for the pedestrians is poor.

•

pedestrians who are carrying larger
objects.

Warnings and brake interventions could be

late or not occur at all. The driver is always

responsible that the vehicle is driven cor-

rectly and with a safety distance adapted

to the speed.

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DRIVER SUPPORT

358

Large animals

Examples of what City Safety interprets as large ani-

mals - standing still or walking slowly and with clear

body outline.

Good performance requires that the system
function that detects a large animal (e.g. elk
and horse) must receive the clearest possible
information about the body outline, requiring
the ability to identify the animal directly from
the side in combination with what is a normal
pattern of movement for the animal.

If parts of the animal's body are not visible to
the function's camera then the system cannot
detect the animal.

City Safety can also detect large animals in the
dark if they are illuminated by the car's head-
lamps.

WARNING

City Safety is supplementary driver sup-

port, but it cannot detect all large animals

in all situations and, for example, cannot

see:

•

partially obscured large animals.

•

larger animals seen from the front or
from behind.

•

large animals that run or move quickly.

•

large animals if the background con-
trast for the animals is poor.

•

small animals such as dogs and cats,
for example.

Warnings and brake interventions could be

late or not occur at all. The driver is always

responsible that the vehicle is driven cor-

rectly and with a safety distance adapted

to the speed.

Related information

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•

City Safety in cross traffic

City Safety

can help the driver when turn-

ing and crossing the path of another oncom-
ing vehicle at an intersection.

Sector in which City Safety can detect
oncoming crossing vehicles.

For City Safety to detect an oncoming vehicle
on a collision course, the oncoming vehicle
must first enter the sector in which City Safety
can analyse the situation.

The function is not available in all markets.

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The following further criteria must also be ful-
filled:

•

your car must be travelling at no less than
4 km/h (3 mph)

•

your car must turn to the left in markets
with right-hand traffic (or to the right in
left-hand traffic)

•

the oncoming vehicle must have its head-
lamps switched on.

Related information

•

•

Limitations for City Safety in cross

traffic

In some cases City Safety may have difficulty
helping the driver deal with collision risks due
to oncoming cross traffic.

Examples are:

•

Stability control ESC intervenes in the
event of slippery driving conditions.

•

If the oncoming vehicle is detected too
late.

•

If the oncoming vehicle is obscured by
something.

•

If the oncoming vehicle has headlamps
switched off.

•

If the oncoming vehicle drives in an unpre-
dictable manner, for example, abruptly
changes lanes at a late stage.

City Safety in cross traffic (p. 358)

This function uses the car's camera and
radar units, which have certain general lim-
itations.

Related information

•

•

Limitations for camera and radar unit
(p. 419)

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360

City Safety steering assistance for

evasive manoeuvre

City Safety steering assistance can help the
driver to steer away from a vehicle/obstacle
when it is not possible to avoid a collision
simply by braking. City Safety steering assis-
tance cannot be switched off, it is always
activated.

Your car steers away.

Slow moving/stationary vehicles or obsta-
cles.

City Safety engages by amplifying the driver's
steering input, which only occurs after the
driver has begun an evasive manoeuvre - and
then only if the driver is not steering enough to
avoid a collision.

In parallel with the amplified steering input,
the brake system is also used to further
amplify the steering input. The function also

helps to straighten the car again after passing
the obstacle.

City Safety steering assistance can detect:

•

Vehicles

•

cyclists

•

Pedestrians

•

larger animals.

Related information

•

Limitations of City Safety steering assis-
tance when taking evasive action (p. 360)

•

•

Limitations of City Safety steering

assistance when taking evasive

action

City Safety may have limited functionality in
certain situations and fail to intervene e.g.:

•

outside the speed range 50-100 km/h
(30-62 mph)

•

if the driver initiates an evasive manoeuvre

•

if the steering servo creating speed-
dependent steering wheel resistance is
working at reduced power – e.g. when
cooling due to overheating.

City Safety steering assistance for evasive
manoeuvre (p. 360)

This function uses the car's camera and
radar units, which have certain general lim-
itations.

Related information

•

•

Speed-dependent steering force (p. 290)

•

•

Limitations for camera and radar unit
(p. 419)

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361

Automatic braking in the event of

an impeded evasive manoeuvre

with City Safety

City Safety

has the facility to assist the

driver by automatically braking the car earlier
when it is not possible to avoid a collision by
only steering away.

City Safety assists the driver by continuously
attempting to anticipate whether there are
"escape routes" to the side in case a slow or
stationary vehicle ahead is discovered at a late
stage.

Your car (1) "sees" no options for evading the vehicle

ahead (2) and can therefore auto-brake earlier.

Your car

Slow/stationary vehicle

City Safety does not intervene with the auto-
brake function as long as the driver him/
herself has the opportunity to avoid a collision
via a steering manoeuvre.

However, if City Safety anticipates that an
evasive manoeuvre is not possible due to traf-
fic in an adjacent lane, the function can assist
the driver by automatically starting to brake at
an earlier stage.

Related information

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