2020 VOLVO S90 TWIN ENGINE brake sensor

DRIVER SUPPORT
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City Safety braking for oncoming vehicles (p. 323)
Automatic braking during delayed evasivemaneuvers with City Safety (p. 323)
City Safety in crossing traffic (p. 320)
City Safety steering assistance for evasivemaneuver (p. 322)
City Safety limitations (p. 324)
City Safety messages (p. 327)
City Safety sub-functions
City Safety 52
can help the driver avoid a colli-
sion with a vehicle, cyclist or large animal ahead by reducing the vehicle's speed usingits automatic braking function.
If the difference in speed is greater than the speeds specified below, the City Safety auto-brake function cannot prevent a collision, butit can help mitigate its effects.
Vehicles
City Safety can help prevent a collision with a vehicle ahead by reducing your vehicle's speedby up to 60 km/h (37 mph).
Cyclists
City Safety can help prevent a collision with a cyclist ahead by reducing your vehicle's speedby up to 50 km/h (30 mph).
Pedestrians
City Safety can help prevent a collision with a pedestrian ahead by reducing your vehicle'sspeed by up to 45 km/h (28 mph).
Large animals
If there is a risk of colliding with a large ani- mal, City Safety can help reduce your vehicle'sspeed by up to 15 km/h (9 mph). The braking function for large animals is pri- marily intended to mitigate the force of a colli-sion at higher speeds. Braking is most effec- tive at speeds above 70 km/h (43 mph) andless effective at lower speeds.
City Safety sub-functions
Function overview.
Acoustic collision warning signal
Collision warning symbol
Camera/radar sensor distance monitoring
City Safety carries out three steps in the fol- lowing order:
1. Collision warning
2. Brake assistance
3. Auto-brake Descriptions of what happens in these three steps are provided below.
52 This function is not available on all markets.

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City Safety steering assistance for evasive maneuver City Safety steering assistance can help the driver steer away from a vehicle/obstaclewhen it is not possible to avoid a collision bybraking alone. City Safety steering assistanceis always activated and cannot be switchedoff.
Your vehicle swerves away
Slow-moving/stationary vehicle or obsta- cle.
City Safety helps provide assistance bystrengthening the driver's steering move-ments, but only if the driver has begun evasiveaction and the system detects that the driver'ssteering movements are not sufficient to avoida collision. The brake system is used simultaneously to further strengthen steering movements. The function also helps stabilize the vehicle after ithas passed the obstacle. City Safety steering assistance can detect:
vehicles
cyclists
pedestrians
large animals
Related information

City Safety
™ (p. 314)
City Safety limitations (p. 324)
City Safety steering assistance limitations during evasivemaneuvers
City Safety steering assistance may have lim- ited functionality in certain situations and notintervene, e.g.:
at speeds outside the range of 50-100 km/h (30-62 mph)
if the driver does not take evasive action
if speed-dependent power steering wheelresistance is working at reduced power –e.g. during cooling due to overheating.
NOTE
The function uses the vehicle's camera and radar sensor, which has certain generallimitations.
Related information
City Safety steering assistance for evasive maneuver (p. 322)
City Safety limitations (p. 324)
Speed-dependent steering wheel resis-tance (p. 268)
Camera/radar sensor limitations (p. 309)

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your lane must have clear side lane mark- ings
your vehicle must be positioned straight inyour lane
the oncoming vehicle must be positionedwithin your vehicle's lane markings
the oncoming vehicle's headlights mustbe on
the function can only handle “front-to-front” collisions
the function can only detect vehicles withfour wheels.
WARNING
Warnings and brake interventions due to an imminent collision with an oncomingvehicle always come very late.
Related information

City Safety
™ (p. 314)
City Safety limitations (p. 324)
City Safety limitations
City Safety 57
functionality may be reduced in
certain situations.
Surroundings
Low objects
Hanging objects, such as flags for overhang- ing loads or accessories such as auxiliarylights or front protective grids that extendbeyond the height of the hood, may limit City Safety functionality.
Slippery road conditions
The extended braking distance on slippery roads may reduce City Safety's capacity tohelp avoid a collision. In these types of situa-tions, the Anti-lock Braking System and Elec- tronic Stability Control (ESC 58
) are designed
for optimal braking power with maintained stability.
Backlighting
The visual warning signal in the windshield may be difficult to detect in bright sunlight, ifthere are reflections, or if the driver is wearingsunglasses or not looking straight ahead.
Heat
If the temperature in the passenger compart- ment is high due to e.g. bright sunlight, thevisual warning signal in the windshield may betemporarily disabled.
Camera and radar sensor's field of vision
The camera's field of vision is limited and in certain situations, it may be unable to detectpedestrians, large animals, cyclists or vehicles,or it may detect them later than expected. Vehicles that are dirty may be detected later than clean vehicles, and in dark conditions,motorcycles may be detected late or not at all. If a text message displayed in the instrument panel indicates that the camera/radar sensoris obstructed, it may be difficult for City Safetyto detect pedestrians, large animals, cyclists,vehicles or lane markings in front of the vehi-cle. City Safety functionality may therefore bereduced. Text messages may not be displayed for all sit- uations in which the windshield sensors areblocked. The driver must therefore alwayskeep the windshield in front of the camera/radar sensor clean.
CAUTION
Only a workshop may perform mainte- nance on driver support components – anauthorized Volvo workshop is recom-mended.
57 This function is not available on all markets.
58 Electronic Stability Control

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Driver intervention
Backing up
City Safety is temporarily deactivated when the vehicle is backing up.
Low speed
City Safety is not activated at very low speeds under 4 km/h (3 mph). The system will there-fore not intervene in situations in which yourvehicle is approaching another vehicle veryslowly, such as when parking.
Active driver
Action by the driver always has priority. City Safety will therefore not react or will react at alater stage with a warning or intervention insituations in which the driver is clearly steeringand operating the accelerator pedal, even if acollision is unavoidable. An active and aware driving style may there- fore delay collision warnings and interventionin order to minimize unnecessary warnings.
Other limitations
WARNING
The driver support system only issues a warning for obstacles detected by its radarsensor – thus, a warning may come after adelay or not at all. Never wait for a warning or assistance. Apply the brakes when necessary.
WARNING
Warnings and brake interventions can be triggered late or not at all if the traf-fic situation or external influences pre-vent the camera and radar unit fromproperly detecting pedestrians,cyclists, large animals or vehiclesahead of the vehicle.
To be able to detect vehicles at night,its front and rear lights must work andilluminate clearly.
The camera and radar unit have a lim-ited range for pedestrians and cyclists– the system can provide effectivewarnings and brake interventions if therelative speed is lower than 50 km/h(30 mph). For stationary or slow-mov-ing vehicles, warnings and brake inter-ventions are effective at vehicle speedsof up to 70 km/h (43 mph). Speedreduction for large animals is less than15 km/h (9 mph) and can be achievedat vehicle speeds over 70 km/h(43 mph). At lower speeds, the warn-ing and brake intervention for large ani-mals is less effective.
Warnings for stationary or slow-mov-ing vehicles and large animals can bedisengaged due to darkness or poorvisibility.
Warnings and brake interventions for pedestrians and cyclists are disen-gaged at vehicle speeds over 80 km/h(50 mph).
Do not place, affix or mount anythingon the inside or outside of the wind-shield, or in front of or around the cam-era and radar unit – this could disruptcamera-based functions.
Objects, snow, ice or dirt in the area ofthe camera sensor can reduce thefunction, disengage it completely orgive an improper function response.

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WARNING
The City Safety auto-brake function can prevent a collision or reduce colli-sion speed, but to ensure full brakeperformance the driver should alwaysdepress the brake pedal – even whenthe car auto-brakes.
The warning and steering assistanceare only activated if there is a high riskof collision – you must therefore neverwait for the collision warning or CitySafety to intervene.
Warnings and brake interventions forpedestrians and cyclists are disen-gaged at vehicle speeds over 80 km/h(50 mph).
City Safety does not activate auto-braking intervention during heavyacceleration.
NOTE
The function uses the vehicle's camera and radar sensor, which has certain generallimitations.
Market limitationsCity Safety is not available in all countries. If City Safety is not shown in the center display's
Settings menu, your vehicle is not equipped
with this function. In the center display's Top view, tap:
SettingsMy CarIntelliSafe
Related information
City Safety
™ (p. 314)
Camera/radar sensor limitations (p. 309)

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* Option/accessory.335
The vehicle is parked very far into a parking space.
In a diagonal parking space, CTA may be completely "blind" on one side of your vehicle.
CTA's blind zone.
CTA's field of vision.
However, as you back your vehicle slowly out of a parking space, CTA's field of vision changes in relation to the obstructing vehicle/object and its blind zone is reduced.
Examples of further limitations

The
auto brake sub-function only detects
vehicles in motion and may therefore not
"see" and brake for e.g. stationary obsta- cles, a cyclists or a pedestrian.
Dirt, ice and snow covering the sensorsmay reduce functionality and prevent thesystem from providing warnings.
NOTE
The function uses the vehicle's camera and radar sensor, which has certain generallimitations.
Related information

Cross Traffic Alert
* (p. 333)
Camera/radar sensor limitations (p. 309)

DRIVER SUPPORT
* Option/accessory.
358
Park Assist front, rear and sides *
Park Assist behaves differently depending on which part of the vehicle is approaching anobstacle.
Front camera
The warning signal has a continuous tone when the obstacle is less than approx. 30 cm (1 ft) from thevehicle.
The Park Assist system's front sensors are automatically activated when the engine isstarted. They are active at speedsbelow 10 km/h (6 mph). The distance monitored extends approx. 80 cm (2.5 ft) in front of the vehicle.
NOTE
The Park Assist system is deactivated when the parking brake is used or when P
is selected on vehicles with automatictransmission.
CAUTION
When installing auxiliary lights: Make sure these do not obscure the sensors – theauxiliary lights could be perceived as anobstacle.
Back
The warning signal has a continuous tone when the obstacle is less than approx. 30 cm (1 ft) from thevehicle.
The rear sensors will be activated if the vehicle begins rolling backward or if reverse gear isengaged. The distance monitored extends approx. 1.5 meters (5 ft) behind the vehicle.
Side sensors
The warning signal will begin pulsating rapidly when the obstacle is less than approx. 25 cm (0.8 ft) fromthe vehicle.
Park Assist's side sensors are automatically activated when the engine is started. They areactive at speeds below 10 km/h (6 mph). The distance monitored is approx. 25 cm (0.8 ft) out from the sides. The detection area of the side sensors increa- ses significantly, however, when the steering angle of the front wheel increases and depending on the position of the steeringwheel, obstacles up to approx. 90 cm (3 ft)

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* Option/accessory.
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CAUTION
Objects such as chains, thin and glossy poles or low obstacles may end up in the"signal shadow" and then go temporarilyundetected by the sensors – the pulsatingtone may then unexpectedly stop insteadof becoming a constant tone as expected. The sensors cannot detect high objects, such as protruding ramps. In such situations, pay extra attention and maneuver/drive the vehicle veryslowly or stop the current parkingmaneuver – there may be a high risk ofdamage to the vehicle or other objectssince information from the sensors isnot always reliable in such situations.
CAUTION
In some circumstances, the Park Assist System may produce false warnings due toexternal sound sources with the sameultrasonic frequencies as those the systemworks with. Examples of such sources are horns, wet tires on asphalt, pneumatic brakes, exhaustnoise from motorcycles, etc.
Related information

Park Assist
* (p. 357)