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DISTRONIC PLUS With Steer Assist And Stop & Go Pilot Function - GF30.30-P-0017FQM

MODEL 218 

as of year 2015 

with CODE 266 (DISTRONIC PLUS with Steer Assist and Stop & Go Pilot) 

G12623183Courtesy of MERCEDES-BENZ USA

Function requirements, general 

IMPORTANT Object recording (e.g. vehicle ahead) via the radar sensor system is based on the radar measuring procedure. The front long range radar sensor and the DISTRONIC (DTR) sensors on the front bumper perform a soiling and function test after each engine start to securing perfect functioning. The function test requires an object in the respective detection area which is used as a reference value. DISTRONIC PLUS cannot be activated if a malfunction is established or if there are no objects (for the function test) in the detection range. The radar sensors control unit receives the sensor signals from the DISTRONIC (DTR) sensors on the front bumper via radar CAN 1 and sends them via the chassis FlexRay to the front long range radar sensor. The front long range radar sensor evaluates them in combination with its own signals and, when all the radar sensors are functioning correctly, sends the "Radar sensor system operational" status via chassis FlexRay to the radar sensors control unit.

DISTRONIC PLUS with Steer Assist and Stop & Go Pilot function, general 

The DISTRONIC PLUS automatically controls the speed and the distance to a vehicle driving ahead in accordance with the driver's request by braking when necessary and accelerating again if possible. The distance and speed control is carried out by the radar sensors control unit. In order to do this, the radar sensors control unit actively intervenes in the engine management and/or the brake system.

In stop and go traffic the DISTRONIC PLUS brakes vehicle automatically (if necessary through to a standstill). Once the traffic situation again allows this, the DISTRONIC PLUS accelerates the vehicle automatically up to the set target speed and therefore frees up the driver from these tiring routine tasks (e.g. frequent starting off and braking in stop-and-go or convoy driving traffic).

If the DISTRONIC PLUS recognizes that strong braking is necessary (e.g. weaving in traffic, a stationary obstacle), the DISTRONIC warning lamp in the instrument cluster comes on and an intermittent alarm tone sounds. Both require the driver to proceed with increased caution and to possibly also brake himself. If the driver reacts to the acoustic warning and brakes, he will be assisted in this by the Brake Assist. This calculates the required brake force amplification according to the situation. A threatening accident can be prevented under certain circumstances or at least one can mitigate its consequences. However if the driver fails to respond to the acoustic warning, the PRE-SAFE® brake initiates (in addition to the visual and acoustic warnings) an automated partial and then emergency braking.

IMPORTANT If the DISTRONIC PLUS is switched off, the situation directly in front of the vehicle is still detected and evaluated. In dangerous situations warnings are given, as described above, or there is autonomous braking. The Steering Assistant supports the driver in maintaining directional stability. Here the Steering Assistant is oriented over the whole vehicle speed range on the traffic lane markings and also for lower speeds on the vehicles driving immediately ahead, for example for subsequent dangers in a traffic jam. The vehicle stays in its lane and unintentional movement towards the lane markings is prevented. The Steer Assist does not relieve the driver of his/her task of keeping the vehicle in the lane. It serves more to relieve the load and therefore to facilitate the resultant increase in comfort. Furthermore the support is provided within defined limits, that is very tight and winding driving lanes (e.g. mountain passes) are not supported.

The Steer Assist is designed to be so sensitive that it recognizes whether the driver has his hands on the steering wheel. The Steer Assist will warn about this if this is not the case. The Steer Assist is implemented in the radar sensors control unit. The course of the road in front of the vehicle and the vehicles ahead are recorded via the stereo multifunction camera and the radar sensor system. The steering movements that are requested are carried out by the electric steering. The following subfunctions in the DISTRONIC PLUS are described in the separate "Cruise control (CC) Function" subfunction:

Operation:

The DISTRONIC PLUS is operated via the CRUISE CONTROL lever.

The steering column tube module control unit directly reads in the control signals from the CRUISE CONTROL lever directly, and sends them via the chassis CAN 1, the chassis gateway control unit and chassis FlexRay to the radar sensors control unit.

Design of the cruise control lever 

G12623184Courtesy of MERCEDES-BENZ USA

IMPORTANT If the SPEEDTRONIC LED (without code (494) USA version) lights up, the DISTRONIC PLUS is deactivated and the function variable SPEEDTRONIC (without Code (494) USA version) preselected.

Actuation of the SPEEDTRONIC LED takes place by the switchover logic integrated in the steering column tube module control unit.

IMPORTANT The distance to the vehicle driving immediately ahead is displayed in the multifunction display for t = 5 s after actuation of the CC lever. Through selection of the operating level "DISTRONIC PLUS" in the menu "Assistance" the distance graphic is shown permanently. Display of the distance graphic can be switched on or off independently of the activity of the automatic distance control. The distance to the vehicle driving immediately ahead can be switched on or off via the DISTRONIC control in seven stages between about. t = 1.0 and 2.0 s. If a distance of t = 2.0 s is set for example, the vehicle driving immediately ahead will be followed at a temporal distance of t = 2.0 s. This physical gap increases with increasing speed.

The radar sensors control unit evaluates the following input factors: 

Signal "Engine running" or "Drivetrain operational":

The CDI control unit or the ME-SFI [ME] control unit sends the "Engine running" or "Drivetrain operational" signal to the radar sensors control unit via the chassis CAN 1, the chassis gateway control unit and chassis FlexRay.

Parking brake status

The front SAM control unit directly detects the status of the parking brake indicator switch and transmits the status of the parking brake to the radar sensors control unit via the chassis CAN 1, the chassis gateway control unit and the chassis FlexRay.

Engaged gear range/transmission mode:

The fully integrated transmission control unit transmits information about the engaged gear range and the transmission mode to the radar sensors control unit via the drive train CAN, CDI control unit or ME-SFI [ME] control unit, chassis CAN 1, chassis gateway control unit and chassis FlexRay. The driver can influence the vehicle acceleration behavior over the transmission mode button. The front SAM control unit control unit directly reads in the status of the transmission mode button over the instrument panel LIN and transmits these via the chassis CAN 1, CDI control unit or ME-SFI [ME] control unit and drive train CAN to the fully integrated transmission control unit.

Driver request via the cruise control lever:

The driver request over the CC lever are directly read in by the steering column tube module control unit. The steering column tube module control unit sends in control signals from the CC lever via the chassis CAN 1, the chassis gateway control unit and chassis FlexRay to the radar sensors control unit.

Vehicle speed/direction of travel/acceleration

The vehicle speed is calculated from the wheel speed and the acceleration is defined over the increase in RPM. The Electronic Stability Program control unit sends corresponding information to the radar sensors control unit and to the stereo multifunction camera via chassis CAN 1, the chassis gateway control unit and chassis FlexRay.

ESP® status:

The Electronic Stability Program control unit transmits the status of the ESP® via the chassis CAN 1, chassis gateway control unit and chassis FlexRay to the radar sensors control unit.

"Steer Assist" status (Steer Assist only):

The Steer Assist can be switched on or off over the "Assistance" menu of the IC. The status is sent by the instrument cluster via the chassis CAN 2, the chassis gateway control unit and chassis FlexRay to the radar sensors control unit.

IMPORTANT After being switched on or off, the message "Steer Assist on/off" is displayed for t = 5 s in the instrument cluster multifunction display.

Status of the electric power steering (only Steer Assist)

The electrical power steering control unit sends information about the status of the electric power steering via chassis CAN 2, chassis gateway control unit and chassis FlexRay to the radar sensors control unit.

Object detection by the Adaptive cruise control (DTR) front bumper sensors

The front bumper radar sensors operate according to the short impulse principle and have a maximum range of s = 30 m. The DISTRONIC (DTR) sensors on the front bumper detect objects in the short-range area and transmit appropriate data via the radar CAN 1 to the radar sensors control unit.

Object detection by the front long range radar sensor:

The front long range radar sensor monitors the area in front of the vehicle up to a distance of s = 200 m within a corridor of ∠ = 18°.

The front long range radar sensor operates according to the pulse modulated Doppler radar concept, which enables the distances and speeds of individual objects (e.g. vehicles) to be measured independently of each other. The front long-range radar sensor sends corresponding data via chassis FlexRay to the radar sensors control unit. Object detection by the stereo multifunction camera (Steer Assist only):

The stereo multifunction camera consists of two high-resolution mono cameras and an integrated control unit. The laterally offset location of the two mono cameras creates a difference in perspective (parallax displacement) between the left and right optical path. The distance to the object ahead and other variables such as the height thereof are calculated on the basis of the differences between the image data.

The stereo multifunction camera records vehicles in the same lane under the following conditions:

IMPORTANT The shorter the distance to the vehicle in front, the greater the effect of the parallax shift and the more accurate the evaluation (without taking possible interfering variables into consideration). From a distance of approx. s = 40 m (image data differences between those from the mono cameras are extremely small), evaluation is no longer possible.

Stereo multifunction camera object recording 

G12623185Courtesy of MERCEDES-BENZ USA

The integrated control unit evaluates image data from the two mono cameras, processes it and transmits appropriate data via the chassis FlexRay to the radar sensors control unit. The radar sensors control unit compares the image data with the signals from the radar sensor system. Lane data (Steer Assist only):

The stereo multifunction camera records pictures of the lane markings on the road regularly with a fixed sampling rate. The integrated control unit calculates a lane from the picture sequences and the measurements resulting from the pictures of the road markings. The stereo multifunction camera sends the lane data via the chassis FlexRay to the radar sensors control unit.

Stereo multifunction camera lane recording 

G12623186Courtesy of MERCEDES-BENZ USA

IMPORTANT Detailed information about lane detection is contained in the separate subfunction "Active Lane Keeping Assist function".

Steering torque of driver and wheel angle (Hands-Off Detection status) (Steer Assist only)

The electric power steering torque sensor records the steering torque applied by the driver. The electrical power steering control unit directly reads in the signals from the electric power steering torque sensor and sends these via chassis CAN 2, the chassis gateway control unit and the chassis FlexRay to the radar sensors control unit. On the basis of these values, the radar sensors control unit determines whether and at which time intervals the driver is making steering movements (Hands-Off Detection).

GPS signals/signals for traffic assessment:

The COMAND controller unit or the radio evaluates the received GPS data utilizing further information for the traffic assessment and sends corresponding information via interior CAN, front SAM control unit, chassis CAN 1, chassis gateway control unit and chassis FlexRay to the radar sensors control unit.

IMPORTANT Depending on the equipment involved, information on topological events such as toll stations, rotaries, radius of curves, ascents or descents flows into the head unit assessment, to enable a more precise traffic assessment to be made.

Engine drive torque:

The CDI control unit or the ME-SFI [ME] control unit sends information about the currently available engine drive torque via chassis CAN 1 to the Electronic Stability Program control unit which evaluates this appropriately and transmits it via the chassis CAN 1, chassis gateway control unit and chassis FlexRay to the radar sensors control unit.

Braking torque:

The Electronic Stability Program control unit transmits information about the currently applied braking torque via chassis CAN 1, the chassis gateway control unit and chassis FlexRay to the radar sensors control unit.

Run Flat Indicator status (with code (475) Tire pressure monitoring (Premium) or code (477) Tire pressure loss warning) (Steer Assist only):

Vehicles with code (475) Tire pressure monitor (Premium):

The tire pressure monitor control unit sends the information about the

respective tire pressure to the radar sensors control unit via chassis CAN 2, chassis gateway control unit and chassis FlexRay.

Vehicles with code (477) Tire pressure loss warning:

The tire pressure is determined using the rolling circumference. The tire pressure loss warning (RDW) system is functionally integrated in the Electronic Stability Program control unit. The Electronic Stability Program control unit transmits information about the calculated tire pressure to the radar sensors control unit via chassis CAN 2, the chassis gateway control unit control unit and chassis FlexRay.

IMPORTANT Information about the Run Flat Indicator can be found in the separate function description "Tire pressure monitor, function" (with code (475) Tire pressure monitor (Premium)) or "Tire pressure loss warning, function" (with code (477) Tire pressure loss warning).

Trailer recognition status (with code (550) Trailer hitch) (Steer Assist only):

When a trailer is detected, the trailer recognition control unit sends the "Trailer detected" status to the radar sensors control unit via the interior CAN, from SAM control unit, chassis CAN 1, the chassis gateway control unit and chassis FlexRay.

Acceleration/yaw rate:

The acceleration/yaw rate is detected by the yaw rate sensor for lateral and longitudinal acceleration. The yaw rate sensor for lateral and longitudinal acceleration sends corresponding values via vehicle dynamics CAN, Electronic Stability Program control unit, chassis CAN 1, the chassis gateway control unit and chassis FlexRay to the radar sensors control unit and stereo multifunction camera. For an active Steer Assistant and subsequent dangers in a traffic jam the stereo MFK calculates the exact position of the vehicle driving immediately ahead based on these values.

Steering angle:

The steering angle is recorded by the steering angle sensor. The steering column tube module control unit directly reads in signals from the steering angle sensor and sends the information about the rotation angle via the chassis CAN 1, the chassis gateway control unit and chassis FlexRay to the radar sensors control unit.

Driver request to overtake (sets the turn signals on the combination switch)

The steering column tube module control unit directly reads in the switch position of the combination switch and sends this via the chassis CAN 1, the chassis gateway control unit and chassis FlexRay to the stereo multifunction camera (Steer Assist only) and the radar sensors control unit.

Accelerator pedal position:

The CDI control unit or the ME-SFI [ME] control unit transmits information about the accelerator pedal position to the radar sensors control unit via chassis CAN 1, chassis gateway control unit and chassis FlexRay.

Brake pedal position:

The Electronic Stability Program control unit sends the status of the brake pedal to the radar sensors control unit via chassis CAN 1, the chassis gateway control unit and chassis FlexRay.

The radar sensors control unit emits the following initial parameters (requests): 

Status of the DISTRONIC PLUS (only for Steer Assist)

The radar sensors control unit sends the status of DISTRONIC PLUS via chassis FlexRay, chassis gateway control unit and chassis CAN 2 to the electrical power steering control unit.

Raise/reduce engine torque:

The radar sensors control unit transmits the request "Increase engine torque" or "Reduce engine torque" via the chassis FlexRay, chassis gateway control unit and chassis CAN 1 to the Electronic Stability Program control unit. The Electronic Stability Program control unit evaluates the request as well as further vehicle dynamic requests and sends them according to their relevance via the chassis CAN 1 to the CDI control unit or ME-SFI [ME] control unit. The CDI control unit or the ME-SFI [ME] control unit implements this request.

Engage targeted gear (downshift or upshift):

The radar sensors control unit transmits the request "Engage targeted gear" via the chassis FlexRay, chassis gateway control unit and chassis CAN 1 to the Electronic Stability Program control unit. The Electronic Stability Program control unit evaluates this request as well as further driving dynamics requests and transmits them, according to their relevance, via the chassis CAN 1, the CDI control unit or the ME-SFI [ME] control unit and drive train CAN to the fully integrated transmission control unit. This request is however to be understood as a switching recommendation. Downshifting or upshifting of the A/T takes place autonomously itself by the fully integrated transmission control unit, dependent on the current operating condition.

Raise/reduce braking torque:

The radar sensors control unit transmits the request "Increase braking torque" or "Reduce braking torque" via the chassis FlexRay, chassis gateway control unit and chassis CAN 1 to the Electronic Stability Program control unit. The Electronic Stability Program control unit reacts by directly actuating the traction system hydraulic unit, which reacts by increasing or decreasing the braking torque according to the brake torque.

Steering requests (Steer Assist only):

The radar sensors control unit calculates the additive toothed rack force on the basis of factors such as the steering torque of the driver, the lateral acceleration, the vehicle speed and the object and lane data of the stereo multifunction camera, and transmits appropriate steering requests via the chassis FlexRay, chassis gateway control unit and chassis CAN 2 to the electrical power steering control unit. The electrical power steering control unit receives and checks the plausibility of the incoming steering requests and actuates the electric power steering actuator motor accordingly.

The additive toothed rack force is only available up to a certain threshold value dependent on the above-mentioned variables and thereby limits the characteristic of the steering power assistance.

Emit warning tones, system or warning messages

The radar sensors control unit sends the requests to issue acoustic warnings, system or warning messages via chassis FlexRay, chassis gateway control unit and chassis CAN 2 to the instrument cluster, which issues the corresponding system or warning messages over the multifunction display and directly actuates the instrument cluster speaker and directly actuates the warning buzzer.

The description of the DISTRONIC PLUS function takes place, as an example, in the following chronological sequence:

Activate DISTRONIC PLUS and drive off automatically 

The following options are available for activating DISTRONIC PLUS:

Drive off from standstill without a vehicle in detection range of the radar sensor system

If there is no stationary/moving vehicle in the detection range, the DISTRONIC PLUS function is active but the vehicle does not start off automatically. To initiate the drive-off procedure, the driver has to either briefly press the accelerator pedal from v > 30 km/h or operate the Resume from memory switch on the CRUISE CONTROL lever to call up the last selected set speed (set speed > 30 km/h).

Automated drive-off from standstill with a vehicle in detection range of the radar sensor system

If a stationary or moving vehicle is in the detection range of the radar sensor system, the vehicle follows the vehicle immediately ahead as long as the driver has briefly operated the accelerator pedal beforehand or used the Resume from memory switch on the CC lever to call up the last selected set speed.

IMPORTANT For vehicles at a standstill a specified distance limit exists beyond which a stationary vehicle is no longer displayed.

Technical implementation 

To do this the radar sensors control unit receives or transmits the following information or requests:

Input factors:

Initial parameters:

Automatic distance control 

The automatic distance control can only be activated while driving (v < 30 km/h) if a vehicle driving in front was detected. If the vehicle driving immediately ahead brakes or accelerates, the DISTRONIC PLUS can initiate the following measures for deceleration or acceleration of the vehicle:

The brake application takes place by means of hydraulic pressure controlling in the wheel brake cylinder by the traction system hydraulic unit according to the current vehicle status. To do this the Electronic Stability Program control unit assesses various variables such as the required braking torque.

The driver must press on the brake pedal is sees that the instigated measures are not adequate to avoid any possible collision.

IMPORTANT If the driver does not intervene, an additional intervention by the brake system is made by the PRE-SAFE® brake. Detailed information is available in the separate function description for the "PRE-SAFE® brake function".

If the vehicle driving immediately ahead accelerates again, the engine torque is increased and the vehicle also accelerates. The increase in engine torque is dependent on the ascent or the descent involved, among other things.

The maximum (positive) acceleration is dependent on the selected transmission mode. The driver can influence the vehicle acceleration behavior over the transmission mode button.

The driver furthermore has the option of operating the accelerator pedal to accelerate the vehicle (e.g. when overtaking). The automatic acceleration is put out of action for as long a the driver uses the accelerator pedal. The multifunction display shows the message "DISTRONIC passive". If the automatic distance control requires a higher acceleration than the driver prescribes, the driver request is overlaid by the request for automatic distance control and the "DISTRONIC passive" message goes off.

Technical implementation 

To do this the radar sensors control unit receives or transmits the following information or requests:

Input factors:

Initial parameters:

Change of driving lane (overtaking) 

When overtaking above a speed of v = 70 km/h the vehicle is also automatically accelerated. To do this the driver must initiate the overtaking maneuver by setting the turn signal. In as far as the automatic distance control is activated, the radar sensors control unit recognizes the intention of the driver to overtake and accelerates the vehicle while taking account of the distance to the vehicle driving immediately ahead. When approaching a slowly moving vehicle and therefore an active automatic intervention by the brake system, this is then canceled insofar as the driver initiates the overtaking procedure by operating the turn signal. If required, the vehicle is additionally accelerated.

If there is no vehicle in the detection range of the radar sensor system after the overtaking procedure, the automatic distance control changes over to automatic speed control. If a vehicle driving immediately ahead is subsequently detected as a target object after the overtaking procedure the automatic speed control function changes over again into the automatic distance control function.

The overtaking maneuver is broken off in the following situations:

Technical implementation 

To do this the radar sensors control unit receives or transmits the following information or requests:

Input factors:

Initial parameters:

Convoy driving 

IMPORTANT The convoy driving function is only available in selected Western European countries with the appropriate legislation (overtaking on the right prohibited at speeds in excess of v = 80 km/h, as well as an overtaking speed limit relative to the convoy of a max. v = 20 km/h). If a convoy forms in the left-hand lane due to the current traffic situation that could theoretically be overtaken in the right-hand lane, this is detected by DISTRONIC PLUS. A convoy overtaking maneuver in the right-hand lane (relative overtaking speed to convoy < 20 km/h, maximum overtaking speed v = 85 km/h) is only initiated if the following requirements have been met:

Technical implementation 

To do this the radar sensors control unit receives or transmits the following information or requests:

Input factors:

Initial parameters:

Additional function requirements for Steer Assist power steering 

IMPORTANT After engine start the vehicle must be at standstill for t = 500 ms.

Steer Assist steering power assistance 

The Steer Assist supports the driver in maintaining directional stability (lateral guidance). By means of targeted steering intervention it keeps the vehicle on course and prevents it from unintentionally deviating from the road. For example, if no lane markings are detected in urban traffic or in a motorway traffic jam because of the proximity to the vehicle in front, the stereo multifunction camera evaluates object-related data of the vehicle in front.

If for t > 10 s the electrical power steering control unit detects no torque on the steering wheel ("Hands-Off-Detection") or just a low one, it transmits appropriate information via chassis CAN 2, chassis gateway control unit and chassis FlexRay to the radar sensors control unit and a message via chassis CAN 2 to the IC. The message is displayed in the multifunction display (gray icon with red hands).

If the driver does not react to the message within t = 5 s, an additional acoustic message is issued over the warning buzzer. The radar sensors control unit sends the request to issue an acoustic warning via chassis FlexRay, chassis gateway control unit and chassis CAN 2 to the instrument cluster. The IC directly actuates the warning buzzer and the volume of active audio sources is reduced simultaneously. In this case the radar sensors control unit renders the Steer Assist passive. The "Hands-Off Detection" is suppressed by the radar sensors control unit at vehicle speeds of v < 10 km/h (intelligent Hands-Off-Detection). The status of the Steer Assist is continuously shown to the driver on the multifunction display of the instrument cluster. A message (optical and acoustic) is also always issued if there is a concrete danger situation recognized.

Display on the instrument cluster 

G12623187Courtesy of MERCEDES-BENZ USA

IMPORTANT The system status and the status of readiness to steer are displayed in the upper area of the multifunction display.

IMPORTANT The steering power assistance of the Steer Assist is reduced as the speed increases, when the vehicle is driven on narrow streets or with a limited field of view of the stereo multifunction camera.

IMPORTANT More detailed information about the electric power steering assistance can be found in the separate function description "Electric power steering (ES)".

The following traffic situations lead to object guidance being aborted or Steer Assist being rendered passive:

Automatic speed control 

If the vehicle is in active distance control and the vehicle driving immediately ahead accelerates above v = 200 km/h or removes itself from the detection area of the radar sensor system, the automatic distance control switches over into automatic speed control.

IMPORTANT Detailed information on automatic speed control is available in the separate "Cruise Control (TPM) function" subfunction.

Technical implementation 

To do this the radar sensors control unit receives or transmits the following information or requests:

Input factors:

Initial parameters:

Going back into a lane/person in the front regulation 

If the vehicle driving immediately ahead turns off and there is another vehicle in front, the system only switches over to the new target vehicle if it is moving. The system does not operate for stationary objects unless a preceding vehicle is tracked to a standstill. If while driving a vehicle turns in front within the safe distance to the vehicle driving immediately ahead, the distance to this new vehicle is regulated. If the vehicle is in automatic speed control and a vehicle tuns onto the lane driven in this vehicle is registered as the vehicle driving immediately ahead. If the distance to the moving in vehicle is below the value which was programmed, the DISTRONIC PLUS function brakes the vehicle. If the requested brake power is not sufficient, a visual and an acoustic warning is issued, and the driver has to press the brake pedal. If the driver fails to respond, PRE-SAFE® brake initiates (in addition to the visual and acoustic warnings) an automated partial and then emergency braking.

IMPORTANT The negative acceleration (deceleration) is restricted to 50% (approx. a = 5.0 m/s2 ) of the maximum brake power.

DISTRONIC PLUS is thereby deactivated. The driver is notified of this by emission of an intermittent tone over the warning buzzer and a warning indicator in the instrument cluster's multifunction display. The driver can subsequently reactivate the DISTRONIC PLUS.

Technical implementation 

To do this the radar sensors control unit receives or transmits the following information or requests:

Input factors:

Initial parameters:

Passing over roundabouts, T intersections and freeway exit lane 

Before entering rotaries, T junctions and freeway exits, the DISTRONIC PLUS brakes the vehicle.

If the vehicle driving immediately ahead leaves the detection area of the radar sensor system in one of the above-mentioned traffic situations, then the current speed is maintained:

IMPORTANT Since traffic situations are subject to alteration, the digital map data has to be regularly updated.

Technical implementation 

To do this the radar sensors control unit receives or transmits the following information or requests:

Input factors:

Initial parameters:

Automated Stop Vehicle 

For an active DISTRONIC PLUS the vehicle will follow the vehicle driving immediately ahead to standstill. The deceleration here is due to the service brake. The service brake also secures a stationary vehicle against rolling away.

After a defined time period the electric parking brake is also activated (standstill coordinator safety strategy).

IMPORTANT Securing the vehicle using the DISTRONIC PLUS function (standstill coordinator) does not replace securing the vehicle for parking.

Technical implementation 

To do this the radar sensors control unit receives or transmits the following information or requests:

Input factors:

Initial parameters:

The following traffic situations show the limits of DISTRONIC PLUS:

Obstacles and stationary vehicles

The DISTRONIC PLUS does not brake for obstacles or stationary vehicles which were not previously registered as the target object. If, for example, the detected vehicle turns off and there is an obstacle or a stationary vehicle behind it, no automatic intervention by the brake system occurs.

G07300324Courtesy of MERCEDES-BENZ USA

Vehicles moving across in front of one's own vehicle:

DISTRONIC PLUS may detect vehicles in cross traffic by mistake.

For an activated distance control the vehicle can start off unintended, (e g. at a traffic light with cross-traffic).

G07300325Courtesy of MERCEDES-BENZ USA

Lane change by other vehicles:

The DISTRONIC PLUS does not yet detect the vehicle moving into the lane. The distance to the vehicle moving into the lane becomes too small.

G10050075Courtesy of MERCEDES-BENZ USA

Narrow vehicles:

DISTRONIC PLUS does not detect the vehicle in front at the edge of the carriageway because of its narrow width. The distance to the vehicle in front becomes too small.

G10050077Courtesy of MERCEDES-BENZ USA
  Electrical function schematic for DISTRONIC PLUS with Steer Assist and Stop & Go Pilot   PE30.30-P-2066-97XAA 
  Overview of system components for driver assistance systems   GF54.00-P-9998FQM
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