System Description

DISTANCE CONTROL ASSIST SYSTEM


System Description


FUNCTION DESCRIPTION

When a vehicle is detected ahead
- The vehicle ahead detection indicator comes on.

When vehicle approaches a vehicle ahead
- If the driver is not depressing the accelerator pedal, the system activates the brakes to decelerate smoothly as necessary. If the vehicle ahead comes to a stop, the vehicle decelerates to a standstill within the limitations of the system.
- If the driver is depressing the accelerator pedal, the system moves the accelerator pedal upward to assist the driver to release the accelerator pedal.

When brake operation by driver is required
- The system alerts the driver by a warning chime and blinking the vehicle ahead detection indicator. If the driver is depressing the accelerator pedal after the warning, the system moves the accelerator pedal upward to assist the driver to switch to the brake pedal.

CAUTION:
If the vehicle ahead comes to a standstill, the vehicle decelerates to a standstill within the limitations of the system. The system will release brake control with a warning chime once it judges the vehicle is at a standstill. To prevent the vehicle from moving, the driver must depress the brake pedal. [The system will resume control automatically once the system reaches 5 km/h (3 MPH)].

NOTE:
- Depending on the position of the accelerator pedal, the system may not be able to assist the driver to release the accelerator pedal appropriately.
- When the driver depresses the accelerator pedal even further while the system is moving the accelerator pedal upward, the accelerator pedal control will be canceled.
- When the driver is depressing the accelerator pedal, the brake control by the system is not operated.
- When the driver is depressing the brake pedal, neither the brake control nor the alert by the system operates.
- When the ICC system is set, the DCA system will be cancelled.

OPERATION DESCRIPTION
Calculate the distance and relative speed with the vehicle ahead by ICC sensor integrated unit. Control the accelerator pedal actuator and brake booster control unit based on the calculated value via ITS communication.











Operation Condition
ICC sensor integrated unit performs the control when the following conditions are satisfied.
- When the DCA switch is turned to ON
- When the brake pedal is not depressed
- When the vehicle speed is above approximately 5 km/h (3 MPH)
- When the vehicle ahead is detected
- When the ICC system is not set

No Operation Condition
The ICC sensor integrated unit is not operate when the system is under any conditions of the no operation condition.
- When the brake pedal depressed
- When the ICC system is set
- When the system judges that the vehicle comes to a standstill by the system control
- When the vehicle ahead is not detected

Operation Cancellation Condition
The ICC sensor integrated unit cancels the operation when the system is under any conditions of the operation cancellation condition.
- When the DCA switch is turned to OFF
- When the system malfunction occurs
- When ABS or VDC (including the TCS) operates
- When the VDC is turned OFF
- When the snow mode switch is turned ON
- When driving into a strong light (i.e., sunlight)
- When the ICC sensor integrated unit body window is dirty and the measurement of the distance between the vehicles becomes difficult

Operation At The Driver Operation
Give priority to the driver operation in the following situation.
- When the accelerator pedal is depressed again
- When the brake pedal is depressed

OPERATION AND DISPLAY

DCA Switch











System Display











System Control Condition Display
The DCA system switch indicator illuminates and the system is turned ON by pressing the DCA switch at the system OFF.






Approach Warning Display
- If own vehicle comes closer to the vehicle ahead due to rapid deceleration of that vehicle or if another vehicle cuts in, the system warns the driver with the chime and DCA system display. Decelerate by depressing the brake pedal to maintain a safe vehicle distance if:
- The chime sounds.
- The vehicle ahead detection indicator blinks.
- The warning chime may not sound in some cases when there is a short distance between vehicles. Some examples are:
- When the vehicles are traveling at the same speed and the distance between vehicles is not changing
- When the vehicle ahead is traveling faster and the distance between vehicles is increasing
- When a vehicle cuts in near own vehicle
- The warning chime will not sound when own vehicle approaches vehicles that are parked or moving slowly.






Warning Lamp Display






ICC SENSOR INTEGRATED UNIT INPUT/OUTPUT SIGNAL ITEM

Input Signal Item






Output Signal Item