System Description-Automatic Emergency Braking

SYSTEM DIAGRAM

Courtesy of NISSAN NORTH AMERICA, INC.

ADAS CONTROL UNIT INPUT/OUTPUT SIGNAL ITEM

Input Signal Item

Transmit unit	Signal name		Description
ECM	CAN communication	Closed throttle position signal	Receives idle position state (ON/OFF)
		Accelerator pedal position signal	Receives accelerator pedal position (angle)
		Engine speed signal	Receives engine speed
		Stop lamp switch signal	Receives an operational state of the brake pedal
		Brake pedal position switch signal	Receives an operational state of the brake pedal
TCM	CAN communication	Input speed signal	Receives the number of revolutions of input shaft
		Current gear position signal	Receives a current gear position
		Shift position signal	Receives a selector lever position
		Output shaft revolution signal	Receives the number of revolutions of output shaft
ABS Actuator and Electric Unit (Control Unit)	CAN communication	ABS malfunction signal	Receives a malfunction state of ABS
		ABS operation signal	Receives an operational state of ABS
		ABS warning lamp signal	Receives an ON/OFF state of ABS warning lamp
		TCS malfunction signal	Receives a malfunction state of TCS
		TCS operation signal	Receives an operational state of TCS
		VDC OFF switch signal	Receives an ON/OFF state of VDC
		VDC malfunction signal	Receives a malfunction state of VDC
		VDC operation signal	Receives an operational state of VDC
		Vehicle speed signal (ABS)	Receives wheel speeds of four wheels
		Yaw rate signal	Receives yaw rate acting on the vehicle
		Stop lamp switch signal	Receives an operational state of the brake pedal
Steering angle sensor	CAN communication	Steering angle sensor malfunction signal	Receives a malfunction state of steering angle sensor
		Steering angle sensor signal	Receives the number of revolutions turning direction of the steering wheel
		Steering angle speed signal	Receives the turning angle speed of the steering wheel
Distance sensor (ICC sensor)	ITS communication	Distance sensor (ICC sensor) signal	Receives detection results, such as the presence or absence of a leading vehicle and distance from the vehicle
Front camera unit	Chassis CAN communication	Pedestrian ahead signal	Receives detection results of pedestrian ahead signal
		Vehicle ahead signal	Receives detection results of vehicle ahead

Output Signal Item

Reception unit	Signal name			Description
ABS Actuator and Electric Unit (Control Unit)	CAN communication	Brake fluid pressure control signal		Transmits a brake fluid pressure control signal to activate the brake
Combination meter	CAN communication	Meter display signal	Vehicle ahead detection indicator signal	Transmits a signal to display a state of the system on the information display
			AEB/I-FCW system display signal
			AEB warning signal
Distance sensor (ICC sensor)	ITS communication	Vehicle speed signal		Transmits a vehicle speed calculated by the ADAS control unit
		Steering angle sensor signal		Transmits a steering angle sensor signal received from the steering angle sensor
ICC brake hold relay	ICC brake hold relay drive signal			Activates the brake hold relay and turns ON the stop lamp

DESCRIPTION

Automatic Emergency Braking (AEB) system can assist the driver when there is a forward collision with the vehicle ahead in the traveling lane.
AEB system operates at speeds above approximately 5 km/h (3 mph).

FUNCTION DESCRIPTION

The AEB system uses the Distance sensor (ICC sensor) to measure the distance to the vehicle ahead in the traveling lane.
The AEB system detects a pedestrian using the lane camera unit installed in the windshield glass.
If there is a risk of collision, AEB issues a visual and audible warning signal to the combination meter via CAN communication.
If the driver does not take action, AEB system applies braking command to ABS Actuator and Electric Unit (Control Unit).
If the risk of a collision becomes imminent, AEB system applies braking command to ABS Actuator and Electric Unit (Control Unit) via CAN communication.

Operation Condition

AEB is ON.
Vehicle speed: approximately 5 km/h (3 mph) and above.
There is a possibility of a collision with the vehicle ahead.

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

Fail-safe (ICC RADAR)

If a malfunction occurs in each system, ADAS control unit cancels each control, sounds a beep, and turns ON the warning or indicator lamp.

System	Buzzer	Warning lamp/Warning display	Description
Intelligent Cruise Control (ICC)	High-pitched tone	ICC system warning	Cancel
Conventional (fixed speed) cruise control mode	High-pitched tone	ICC system warning	Cancel
Automatic Emergency Braking (AEB)	High-pitched tone	AEB warning lamp (Yellow)	Cancel
Intelligent Forward Collision Warning (I-FCW)	High-pitched tone	AEB warning lamp (Yellow)	Cancel
Blind Spot Warning (BSW)	Low-pitched tone	BSW system warning (Orange)	Cancel