Adaptive Cruise Control (ACC)
Overview
Adaptive cruise control controls speed and the distance from a detected vehicle in front to maintain a safe following distance.
When the vehicle is traveling above 10 mph (15 km/h) and there is no vehicle in front, ACC operates in the same way as standard cruise control by accelerating to the set speed.
The default following speed of adaptive cruise control is 3.6 seconds but can be adjusted in the range of 2.4 and 3.6 seconds.
When a vehicle in front is detected, the driver display shows the speed of the detected vehicle and the distance to the detected vehicle. See Fig..
Fig. 1, Adaptive Cruise Control Screen
Safety Information
Warning: The Detroit Assurance system is intended solely as an aid for an alert and conscientious professional driver. It is not intended to be relied upon to operate a vehicle. Use the system in conjunction with rearview mirrors and other instruments to safely operate the vehicle.
The Detroit Assurance system is not a substitute for safe, normal driving procedures, nor will it compensate for any driver impairment such as drugs, alcohol, or fatigue.
Failure to drive safely and use the system properly could result in personal injury and/or death and severe property damage.
Operate a vehicle equipped with the Detroit Assurance system as if the vehicle were not equipped with a collision warning system.
Adaptive cruise control (ACC) may not detect narrow vehicles, like motorcycles, driving in front of the vehicle, or vehicles driving in a different lane.
In particular, be aware of the following situations:
-
cornering, entering, and exiting bends;
-
vehicles driving in a different lane;
-
vehicles changing lanes;
-
vehicles exiting the road;
-
overtaking;
-
winding stretches of road; and
-
obstacles and stationary vehicles.
Adaptive cruise control does not compensate for inattentive driving, weather, or traffic conditions. Adaptive cruise control is only an aid. The driver is responsible for maintaining a safe distance from the vehicle in front, maintaining a safe vehicle speed, braking, and remaining in a lane.
ACC Controls
See Fig. and see Table. for a description of cruise control steering wheel switches.
Table 1, Steering Wheel Controls
|
Steering Wheel Controls |
|
|---|---|
|
Description |
Function |
|
/SET |
Sets the cruise speed while the vehicle is traveling at the desired speed. Pressing and and holding decreases the set cruise speed. |
|
+/RES |
Resumes the set speed. Pressing and holding increases the set cruise speed. |
|
CNCL |
Deactivates cruise control, but retains the set speed in memory. |
Table 1, Steering Wheel Controls
-
Cruise Accelerate/Resume
-
Quick Access System Settings
-
Cruise Decelerate/Set
-
Phone Hang-Up/Reject
-
Marker Interrupt
-
Phone Pick-Up
-
Headlamp Interrupt
-
Cruise Cancel
-
Volume Increment Up
-
Menu Right
-
Volume Increment Down
-
Menu Down
-
Back Button
-
Menu Left
-
Menu Accept (OK)
-
Menu Up
Fig. 2, Steering-Wheel-Mounted Switches
Functions and Activation Conditions
If ACC detects a vehicle in front driving at a speed slower than the set cruise speed, the engine is derated, the engine brakes are activated, and the service brakes are applied, slowing the vehicle to maintain the minimum following distance. If the vehicle in front is no longer detected, the vehicle will accelerate to the set speed. The ACC will also slow the vehicle if it exceeds the set speed (on a downhill grade, for example).
Adaptive cruise control cannot be activated, or is automatically deactivated, if:
-
the vehicle is traveling slower than 10 mph (15 km/h);
-
the transmission is in neutral for more than 5 seconds;
-
reverse gear is selected;
-
ABS is deactivated;
-
there is a malfunction in the brake system or the electronic management system; or
-
the distance sensor initialization is not yet complete.
Activating Adaptive Cruise Control and Setting the Speed
Activate ACC by setting the cruise speed, using the controls on the steering wheel. See Table..
Drive at the desired speed, then press the /SET switch. Adaptive cruise control will be activated and the set speed stored.
If the brake pedal is pressed, ACC is automatically deactivated.
If ACC is deactivated, the stored speed can be activated again by pressing the +/RES switch. The driver display will show the adaptive cruise control symbol and the set speed. Adaptive cruise control will automatically brake or accelerate the vehicle to maintain the set speed.
If ACC is, or becomes, unavailable, a message will be displayed that allows the driver to choose to use standard cruise control. See Fig..
Fig. 3, ACC Unavailable
Increasing or Reducing Speed
The speed setting can only be set when driving.
Press /SET to set the cruise speed while the vehicle is traveling at the desired speed. Press and hold to decrease the set cruise speed.
Setting the Distance to the Vehicle in Front
The ACC settings menu can be used to set the distance to the vehicle in front.
Important: Make sure that the minimum distance is maintained to the vehicle in front required by law. Adjust the specified minimum distance to the vehicle in front if necessary.
Collision Warning
Note: If the accelerator pedal is pressed, or a turn is indicated, the collision avoidance system is suppressed.
In the event of a potential collision, a warning appears on the driver display screen and a double warning tone sounds. The warning screen is displayed for as long as the hazardous situation persists.
If a collision warning appears on the driver display screen, pay attention to the traffic situation and reduce the vehicle speed using the service brake.
Overtaking
Note: It is possible to exceed the set speed when overtaking.
The set speed can be exceeded using the accelerator pedal. When the accelerator pedal is released, the set speed will be resumed.
Deactivating the System
Press the CNCL switch, or, press the brake pedal to deactivate cruise control.
Note: The set speed remains stored when ACC is deactivated.