Cruise control (CC) function engine 272 - GF30.30-P-0001V

Shown on engine 272.963 in model 171 

Fig 1: Cruise Control (CC) Function Diagram - Shown On Engine 272.963 In Model 171

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The cruise control must maintain the preselected speed constant irrespective of the load condition, without the accelerator pedal being operated.

The Cruise control function can be actuated using the Cruise control push-button switch. The engine control unit actuates the throttle valve actuator for the cruise control function with the aid of input signals and the position of the cruise control push-button switch.

The cruise control mode is switched off by:

• Moving the cruise control switch into OFF position
• Actuation of the service brake (CAN message)
• Moving selector lever into position "N"
• Operation of the clutch pedal
• Control intervention function of the traction system.

The signals from the push-button switch on the cruise control are detected by the steering column module and transmitted over the CAN data bus to the engine control unit.

The speed signal is transmitted by the traction system control unit (ESP) via the CAN to the engine control unit.

Variable speed limiter (VSL), except 

Switching in the variable speed limit takes place through pressing the Cruise control push-button switch (yellow light emitting diode lights up). The vehicle speed limit is set by means of the variable cruise control switch.

If the braking effect in overrun mode is not sufficient to maintain the speed at a high gradient, a chime will request the driver to brake.

Vehicles with Distronic (DTR) are braked.

Deviating functions compared to cruise control:

• Variable speed-governor function (VGB) adjustable from 30 km/h (20 mph) to the top speed of the vehicle.
• The accelerator pedal must be actuated further.
• When the brakes are applied the variable speed limit is not switched off.
• When the ignition is switched OFF  the preset speed data remain stored in the variable cruise control system.