Function Sequence For Automatic Speed Control

Through actuation of the "Resume from memory" switch the last set speed stored is applied, provided a set speed was stored since the last engine start. If no set speed was stored, the current vehicle speed is set as the set speed. The set speed is displayed in the speedometer. To do this the Electronic Stability Program control unit sends the corresponding information via CAN communication, electronic ignition lock control unit and CAN communication to the instrument cluster.

The following events lead to deactivation of the automatic speed control:

• Operation of the OFF switch
• Depressing the brake pedal
• Active regulation of the VDC
• Speed more than 25 km/h (15.5 MPH)
• Electric parking brake activated
• Gear range is not "D"

The electric parking brake control unit transmits the status of the electric parking brake via CAN communication to the Electronic Stability Program control unit. ECM transmits information about the clutch pedal position via the CAN communication to the electronic stability program control unit.

The following activities are started in order to reach or maintain the set speed:

• Increase/reduce engine torque
• Engage targeted gear (back or upshift)
• Increase/reduce the braking torque

The driver also has the option to accelerate beyond the set target speed through actuation of the accelerator pedal (for example when overtaking).

The set speed is regulated again after removal of the acceleration request (releasing the accelerator pedal).