VEHICLE-TO-VEHICLE DISTANCE CONTROL MODE FUNCTION : System Description

SYSTEM DIAGRAM

Fig 1: Vehicle-To-Vehicle Distance Control Mode Function Diagram

Courtesy of NISSAN MOTOR CO., U.S.A.

FUNCTION DESCRIPTION

In the vehicle-to-vehicle distance control mode, the Intelligent Cruise Control (ICC) system automatically maintains a selected distance from the vehicle traveling in front of own vehicle according to that vehicle's speed (up to the set speed), or at the set speed when the road ahead is clear.

With ICC system, the driver can maintain the same speed as other vehicles without the constant need to adjust the set speed as driver would with a normal cruise control system.

The following items are controlled in the vehicle-to-vehicle distance control mode

When there are no vehicles traveling ahead, the vehicle-to-vehicle distance control mode maintains the speed set by the driver. The set speed range is between approximately 32 and 144 km/h (20 and 90 MPH).
When there is a vehicle traveling ahead, the vehicle-to-vehicle distance control mode adjusts the speed to maintain the distance, selected by driver, from a vehicle ahead. The adjusting speed range is up to the set speed.
When the vehicle traveling ahead has moved out from its lane of travel, the vehicle-to-vehicle distance control mode accelerates and maintains vehicle speed up to the set speed.

CAUTION: If the vehicle ahead comes to stop, the vehicle decelerates to a standstill within the limitations of the system. The system will cancel once it judges that the vehicle has come to a standstill and sound a warning chime.
To prevent the vehicle from moving, the driver must depress the brake pedal.

NOTE: When the accelerator pedal is depressed, the brake operation and the warning are not performed by the ICC system.

OPERATION DESCRIPTION

Quickly push (less than 1.5 seconds) and release the MAIN switch ON.

The MAIN switch indicator, set distance indicator, own vehicle indicator, and set vehicle speed indicator come on and ICC system is set to a standby state.

ADAS control unit performs the control as per the following:

ADAS CONTROL UNIT CONTROLS

Constant speed	Comparing the set vehicle speed with the current vehicle speed, transmit the command to ECM via CAN communication to reach the set vehicle speed, and controls the electric throttle control actuator.
Deceleration	When a vehicle ahead (slower than driver set vehicle speed) appears or when a vehicle ahead slows down, the system controls the electric throttle control actuator into the close direction and decelerates the vehicle. If greater deceleration is necessary, the system transmits the brake fluid pressure control signal to the ABS actuator and electric unit (control unit) via CAN communication and operates the brake.
Following	The system controls the electric throttle control actuator and the brake fluid pressure to keep the proper distance between the vehicles according to the vehicle speed change of the vehicle ahead.
Acceleration	When a vehicle ahead is not detected because of it changes lanes or own vehicle changes lanes during the following driving, the system controls the electric throttle control actuator in the open direction and accelerates the vehicle to the set vehicle speed slowly.

Set Condition

Under a standby state, pushing down the SET/COAST switch will start system control.

When vehicle speed is between approximately 32 km/h and 144 km/h (20 MPH and 90 MPH).
When vehicle speed is below approximately 32 km/h (20 MPH) if the vehicle ahead is detected. The set vehicle speed becomes 32 km/h (20 MPH).

If the system is canceled by conditions 1-6 below, the system will resume control at the last set cruising speed by pushing up the RESUME/ACCELERATE switch.

NOTE:

When the SET/COAST switch is pushed under the following conditions, the system cannot be set and the set vehicle speed indicator will blink for approximately 2 seconds.
- When traveling below 32 km/h (20 MPH) and the vehicle ahead is not detected.
- When the selector lever is not in the "D" position or manual mode.
- When the front wipers are operating at HI.
  (If the vehicle is equipped with a rain sensing auto-wiper, the system may cancel when the wipers are set to AUTO)
- When the parking brakes are applied.
- When the brakes are operated by the driver.
  
  Fig 2: Display Set Vehicle Speed Indicator
  Courtesy of NISSAN MOTOR CO., U.S.A.
When the SET/COAST switch is pushed under the following conditions, the system cannot be set. A warning chime will sound and the set speed indicator and own vehicle indicator will blink.
- When the drive mode select switch is in SNOW position. (To use the ICC system, turn OFF the snow mode, push the MAIN switch to turn OFF the ICC system and reset the ICC system by pushing the MAIN switch again.)
- When the VDC is OFF. (To use the ICC system, turn ON the VDC system, push the MAIN switch to turn OFF the ICC system and reset the ICC system by pushing the MAIN switch again.)
- When ABS or VDC (including the TCS) operates.
- When driving into a strong light (i.e., sunlight).
- When the wheel is slipping. (To use the ICC system, make sure the wheels are no longer spinning, push the MAIN switch to turn OFF the ICC system and reset the ICC system by pushing the MAIN switch again.)
  
  Fig 3: Display Of Warning Lamp On ICC System Display
  Courtesy of NISSAN MOTOR CO., U.S.A.

Cancel Conditions

When CANCEL switch is pressed.
When brake pedal is depressed.
When the vehicle ahead is not detected below the speed of 24 km/h (15 MPH).
When the selector lever is not in the "D" position or manual mode.
When the parking brakes are applied.
When the system judges the vehicle is at standstill.
When the front wipers are operating at HI.
(If the vehicle is equipped with a rain sensing auto-wiper, the system may cancel when the wipers are set to AUTO.)
When the drive mode select switch is in SNOW position.
When ABS or VDC (including the TCS) operates.
When the MAIN switch is turned OFF.
When a wheel slips.
When driving into a strong light (i.e., sunlight).
When the VDC is turned OFF.
When the system malfunction occurs.