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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Cruise Control System (ICC) >> System Description >> System >> Vehicle-To-Vehicle Distance Control Mode Function >> System Description
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System Description

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:

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: SYMBOL 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:

Constant speed Comparing the set vehicle speed with the current vehicle speed, transmits 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 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 - switch will start system control.

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 + switch.

NOTE: SYMBOL
  • When the SET - 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 30 km/h (18 MPH) and the vehicle ahead is not detected.
    • When the selector lever is not in the "D" position or manual mode.
    • When the parking brakes are applied.
    • When the brakes are operated by the driver.
  • When the SET - switch is pushed under the following conditions, the system cannot be set and a warning chime will sound and displays the causes in combination meter (information display):
    • 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 VDC (including the TCS) operates.
    • 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.)

Cancel Conditions 

  1. When CANCEL switch is pressed.
  2. When brake pedal is depressed.
  3. When the vehicle ahead is not detected below the speed of 25 km/h (15 MPH).
  4. When the selector lever is not in the "D" position or manual mode.
  5. When the parking brakes are applied.
  6. When the system judges the vehicle is at standstill.
  7. When VDC (including the TCS) operates.
  8. When the MAIN switch is turned OFF.
  9. When a wheel slips.
  10. When the VDC is turned OFF.
  11. When the system malfunction occurs.
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