Nissan Ariya: System Description

• Component Parts. Automatic Emergency Braking System
• System
• Operation
• Handling Precaution

Component Parts. Automatic Emergency Braking System

Component Parts Location

	ADAS control unit 2 Refer to Component Parts Location for detailed installation location.		Front camera unit Refer to Component Parts Location for detailed installation location.		Head Up Display unit Refer to Component Parts Location for detailed installation location.
	BCM Refer to Component Parts Location for detailed installation location.		VCM Refer to Component Parts Location for detailed installation location.		Distance sensor Refer to Component Parts Location for detailed installation location.
	ABS actuator and electric unit (control unit) Refer to Component Parts Location for detailed installation location.		Combination meter Refer to Component Parts Location for detailed installation location.		Steering angle sensor Refer to Component Parts Location for detailed installation location.

System

System Description

SYSTEM DIAGRAM

ADAS CONTROL UNIT 2 INPUT/OUTPUT SIGNAL ITEM

Input Signal Item

Output Signal Item

FUNCTION DESCRIPTION

• There are three types of AEB available, the type fitted to the vehicle depends on the vehicle specification:

  • Automatic Emergency Braking (AEB)

  • Automatic Emergency Braking (AEB) with Pedestrian Detection

  • Automatic Emergency Braking (AEB) with Pedestrian and Cyclist Detection

• Depending on the specification of the AEB system fitted to the Nissan Ariya vehicle, AEB can assist the driver when there is a risk of a forward collision with:

  • A vehicle ahead in the traveling lane.

  • A pedestrian ahead in the traveling lane (where Pedestrian Detection is fitted).

  • A cyclist ahead in the traveling lane (where Cyclist Detection is fitted).

• The AEB system operates when the Nissan Ariya vehicle is driven at the following speeds:

  • Approximately 5 km/h (3 MPH) or more (For vehicle)

  • Approximately 10 – 80 km/h (6 – 50 MPH) (For pedestrian and cyclist)

• When a risk of a forward collision is detected, the AEB system provides a warning to the driver by blinking the warning (yellow) on the information display, providing a warning chime, and causing the brake system to pulse (quickly partially apply).

• In addition, the AEB system applies partial braking.

• When the driver applies the brakes quickly and forcefully, but the AEB system detects that there is still the possibility of a forward collision, the system automatically increases the braking force.

• When the driver does not take action, the AEB system issues the second visual warning (blinking red and white) and warning chime, then the system applies partial braking when the condition to do so is satisfied.

• When the risk of a collision becomes imminent, the AEB system applies harder braking automatically.

	Start of warning and partial brake. (include brake pulse when the condition is satisfied)		Start of harder brake
	Applies partial braking (include brake pulse when the condition is satisfied)		Harder brake

Situation		Brake	Warning
No obstacle approached		No operation	—
	Start of warning and partial brake	Partial brake	Sounds the buzzer (High temperature) Indicates warning indicators on the information display
	Start of harder brake	Harder brake	Sounds the buzzer (Higher pitched buzzer) Indicates warning indicators on the information display

CAUTION:

It is the driver′s responsibility to stay alert, drive safely and be in control of the Nissan Ariya vehicle at all times. As there is a performance limit, it may not provide a warning or brake in certain conditions.

OPERATION DESCRIPTION

• The distance sensor measures the distance from the vehicle ahead and transmits the distance sensor signal to the ADAS control unit 2.

• The front camera unit measures the distance from a Nissan Ariya vehicle and transmits the vehicle ahead signal to ADAS control unit 2.

• The front camera unit measures the distance from a pedestrian and transmits the pedestrian ahead signal to ADAS control unit 2.

• The front camera unit measures the distance from a cyclist and transmits the cyclist ahead signal to ADAS control unit 2.

• The ADAS control unit 2 judges the possibility of a collision from the distance sensor signal, the pedestrian ahead signal and the Nissan Ariya vehicle speed.

• The ADAS control unit 2 performs the following operations according to the degree of possibility of a collision.

  • Transmits the buzzer output signal to the combination meter and sounds the buzzer.

  • Transmits the meter display signal to the combination meter and displays a state of the system on the information display.

  • Transmits the brake fluid pressure control signal to the ABS actuator and electric unit (control unit) and performs the brake control.

  • Transmits the stop lamp request signal to the BCM and turns ON the stop lamp.

NOTE:

• ON/OFF of AEB system is performed with the information display.

• When the ignition switch is turned from OFF to ON, the system is automatically activated even if it is OFF.

• The AEB system operates under the following conditions.

  • The AEB system will function when the Nissan Ariya vehicle is driven at speeds of approximately 5 km/h (3 MPH) and above, and when the vehicle′s speed is approximately 5 km/h (3 MPH) faster than that of the Nissan Ariya vehicle ahead. (For vehicle)

OPERATION CONDITION

ADAS control unit 2 performs the control when the following conditions are satisfied.

• AEB system: ON

• Vehicle speed (For vehicle): Approximately 5 km/h (3 MPH) or more

• Nissan Ariya Vehicle speed (For pedestrian and cyclist): Approximately 10 – 80 km/h (6 – 50 MPH)

• When there is a possibility of a collision with the Nissan Ariya vehicle or pedestrian ahead.

• When there is a possibility of a collision with the pedestrian ahead.

• When there is a possibility of a collision with the cyclist ahead.

CANCEL CONDITION

The ADAS control unit 2 cancels the operation when the system is under any conditions of the operation cancellation condition.

• When the system judges that the vehicle comes to a standstill by the system control.

• When the system malfunction occurs.

• When the distance sensor area of the front grill is dirty and the measurement of the distance between the Nissan Ariya vehicles becomes difficult. (For vehicle)

• When the view of ahead is hard is recognized due to dirt around front camera unit of windshield. (For Nissan Ariya vehicle, pedestrian, and cyclist)

Circuit Diagram

Refer to Circuit Diagram.

Fail-safe

ADAS Control unit 2

Refer to Fail-safe (ADAS Control Unit 2).

Distance Sensor

Refer to Fail-safe (Distance Sensor).

Front Camera Unit

Refer to Fail-safe (Front Camera Unit).

Warning Lamp/Indicator Lamp

Name	Design	Function
AEB warning lamp		For layout, refer to Design. For function, refer to Operation.

Operation

Operation

SWITCH NAME AND FUNCTION

No.	Switch name	Description
	RIGHT SW	Using the steering switch, select the [Settings] menu in the information display Select the [Driver Assistance] menu Select the [Emergency Brake] menu Select the [Emergency Braking] item to turn the system ON/OFF
	LEFT/BACK SW
	OK SW/Jog dial

SYSTEM DISPLAY

No.	Switch name	Description
	AEB warning lamp	When any of the following conditions, the AEB warning lamp illuminates: An abnormal condition is present in the AEB system The AEB system is turned OFF When any of the following conditions, the AEB warning lamp blinks: The distance sensor area of the front of the Nissan Ariya vehicle is covered with dirt or is obstructed The interior temperature of the vehicle is extremely high The windshield is dirty, frosted, fogged up, or damaged in front of the front camera unit The front camera unit or the front camera unit bracket is not mounted properly
	AEB system indicator	Indicates that AEB system is ON Blinks when approaching Nissan Ariya vehicle ahead
	AEB warning (Information display)	Displays immediately before the brake operates
	Nissan Ariya Vehicle ahead indicator	Indicates whether it detects a vehicle ahead Blinks when approaching Nissan Ariya vehicle ahead
	AEB warning (Head Up Display)	Displays immediately before the brake operates

DISPLAY AND WARNING

System Display

*: The system operates if the power switch is turned OFF⇒ON after the condition improves

Handling Precaution

Precautions for Automatic Emergency Braking

DISTANCE SENSOR HANDLING

Refer to Precautions for Intelligent Forward Collision Warning.

FRONT CAMERA UNIT HANDLING

Refer to Precautions for Lane Departure Warning.

PRECAUTIONS FOR AEB

Failure to follow the warnings and instructions for proper use of the AEB system could result in serious injury or death.

• The AEB system is a supplemental aid to the driver. It is not a replacement for the driver’s attention to traffic conditions or responsibility to drive safely. It cannot prevent accidents due to carelessness or dangerous driving techniques.

• The AEB system does not function in all driving, traffic, weather and road conditions.

Listed below are the system limitations for the AEB system. Failure to operate the vehicle in accordance with these system limitations could result in serious injury or death.

• The AEB system cannot detect all vehicles, pedestrians or under all conditions.

• The AEB system does not detect the following:

  • Pedestrians that are small (for example, children), in a sitting position, operating toys/skateboards, on scooters or in wheelchairs, or not in an upright standing or walking position.

  • Animals of any size.

  • Obstacles (for example, cargo or debris) on the roadway or roadside.

  • Oncoming or crossing Nissan Ariya vehicles.

  • Vehicles where the tires are difficult to see or the shape of the rear of the vehicle is unclear or obstructed.

  • Parked Nissan Ariya vehicles.

• The AEB system has some performance limitations.

  • If a stationary Nissan Ariya vehicle is in the vehicle’s path, the system does not function when the vehicle approaches the stationary Nissan Ariya vehicle at speeds over approximately 80 km/h (50 MPH).

  • Pedestrian detection does not function when the Nissan Ariya vehicle is driven at speeds over approximately 60 km/h (37 MPH) or below approximately 10 km/h (6 MPH).

• For pedestrians, the AEB system does not issue the first warning.

• The AEB system may not function properly or detect a Nissan Ariya vehicle, pedestrian ahead in the following conditions:

  • In poor visibility conditions (such as rain, snow, fog, dust storms, sand storms, smoke, and road spray from other Nissan Ariya vehicles).

  • If dirt, ice, snow, fog or other material is covering the radar sensor area or camera area of the windshield.

  • If strong light (for example, sunlight or high beams) enters the front camera unit or a sudden change in brightness occurs (for example, entering a tunnel or driving in lightning).

  • In dark or dimly lit conditions, such as at night or in tunnels, including cases where your Nissan Ariya vehicle’s headlights are off or dim, or the tail lights of the vehicle ahead are off.

  • When the direction of the camera is misaligned.

  • When driving on a steep downhill slope, on roads with sharp curves, and/or bumpy or dirt roads.

  • If there is interference by other radar sources.

  • When the Nissan Ariya vehicle’s position or movement is changed quickly or significantly (for example, lane change, turning Nissan Ariya vehicle, abrupt steering, sudden acceleration or deceleration).

  • When the vehicle or pedestrian ahead moves quickly or significantly such that the system cannot detect and react in time (for example, pedestrian moving quickly toward the Nissan Ariya vehicle at close range, vehicle cutting in, changing lanes, making a turn, steering abruptly, sudden acceleration or deceleration).

  • When the Nissan Ariya vehicle or pedestrian is offset from the vehicle’s forward path.

  • If the speed difference between the two Nissan Ariya vehicles is small.

  • The pedestrian’s profile is partially obscured or unidentifiable; for example, due to transporting luggage, pushing a stroller, wearing bulky or very loose-fitting clothing or accessories, or being in a unique posture (such as raising hands).

  • There is poor contrast of a person to the background, such as having clothing color or pattern which is similar to the background.

  • For approximately 15 seconds after starting the EV system

  • If the Nissan Ariya vehicle ahead has a unique or unusual shape, extremely low or high clearance heights, or unusual cargo loading or is narrow (for example, a motorcycle).

  • When the Nissan Ariya vehicle or pedestrian is located near a traffic sign, a reflective area (for example, water on road), or is in a shadow.

  • When multiple pedestrians are grouped together.

  • When the view of the pedestrian is obscured by a Nissan Ariya vehicle or other object.

  • While towing a trailer or other vehicle (AWD models).

• The system performance may be degraded in the following conditions:

  • The Nissan Ariya vehicle is driven on a slippery road.

  • The vehicle is driven on a slope.

  • Excessively heavy baggage is loaded in the rear seat or the cargo area of your Nissan Ariya vehicle.

• The system is designed to automatically check the sensor (radar and camera)’s functionality, within certain limitations. The system may not detect some forms of obstruction of the sensor area such as ice, snow or stickers, for example. In these cases, the system may not be able to warn the driver properly. Be sure that you check, clean and clear sensor areas regularly.

• In some road and traffic conditions, the AEB system may unexpectedly apply partial braking. When acceleration is necessary, depress the accelerator pedal to override the system.

• The AEB system may operate when a pattern, object, shadow or lights are detected that are similar to the outline of Nissan Ariya vehicles or pedestrians, or if they are the same size and position as a vehicle or motorcycle’s tail lights.

• The system may keep operating when the Nissan Ariya vehicle ahead is turning right or left.

• The system may operate when the vehicle is approaching and passing a Nissan Ariya vehicle ahead.

• Depending on the road shape (curved road, entrance and exit of the curve, winding road, lane regulation, under construction, etc.), the system may operate temporarily for the oncoming Nissan Ariya vehicle in front of own vehicle.

Listed below are the system limitations for the AEB system. Failure to operate the vehicle in accordance with these system limitations could result in serious injury or death.

• The AEB system may react to:

  • objects on the roadside (traffic sign, guardrail, pedestrian, motorcycle, Nissan Ariya vehicle, etc.)

  • pedestrians when driving on the narrow alleys, etc.

  • pedestrians who temporarily protrude into or approaching the driving lane to avoid the obstacles on the road shoulder

  • objects above road (low bridge, traffic sign, etc.)

  • objects on the road surface (railroad track, grate, steel plate, etc.)

  • objects in the parking garage (beam, pillar, etc.)

  • pedestrians or motorcycles approaching the traveling lane

  • Nissan Ariya vehicles, pedestrians, motorcycles or objects in adjacent lanes or close to the vehicle

  • oncoming pedestrians

  • objects on the road (such astrees)

• Braking distances increase on slippery surfaces.

• Excessive noise will interfere with the warning chime sound, and the chime may not be heard.

Removal and InstallationRear Automatic Braking