Distronic (DTR), function

P30.30-2008-79

A1p13 Display in instrument cluster

B29 Distronic (DTR) radar sensor

E3e4 Stop lamp

F1/1 Right fuse and relay box

N10/8 Rear SAM control module

N15/3 ETC control module

N28/1 Trailer recognition control module

N3/10 Engine control module (ME-SFI [ME])

N47-5 ESP control module

N63/1 Distronic (DTR) control module

N72/1 Upper control panel control module

N73 Electronic ignition / starter switch control module

N80 Steering column module

S40/4 Variable cruise control (CC) switch

(  S40 Cruise control switch)

S46/8r1 Distronic (DTR) distance potentiometer

S46/8s1 Distronic (DTR) distance warning function switch

X11/4 Diagnostic data link connector

Tasks

 Maintaining the selected vehicle speed (cruise control function) and, in addition, controlling the distance to a vehicle ahead

 Variable speed limiter (VSL)

 Controlling driver information in the instrument cluster and warning signal (distance warning)

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Design

The Distronic consists of the following components:

 Distronic control module

 Distronic radar sensor

 Distronic switch block with distance potentiometer and distance warning function switch

 Variable cruise control switch

 Displays in instrument cluster and warning signal

 CAN databus

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Function

The cruise control can rarely be used in dense traffaic. The driver either has to constantly adapt the selected speed or switch off the cruise control.

The Distronic detects the traffic situation ahead of the vehicle by means of the radar sensor located behind the radiator grille.

If the driver's own vehicle approaches another vehicle traveling at a slower speed, the speed of the driver's vehicle is reduced. The Distronic (DTR) control unit calculates the distance required and can activate the following over the CAN:

 Increase/reduction in engine specified speed
(through ESP control module)

 Braking (ESP control module)

 Shifting gears (ETC control module)

The Distronic can be used from a speed of about 40 km/h up to 160 km/h.

If no vehicle is driving ahead, the Distronic behaves in the same way as the cruise control.

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The Distronic is a convenience system and not a safety system. The driver has to apply the brakes himself if the traffic situation so demands.

The system has a diagnostic capability.

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If a vehicle suddenly appears ahead (e.g. as a result of changing lanes), the Distronic attempts to control. For safety reasons, however, the braking action is limited to approx. 2 m/s2 (equals approx. 20 % of maximum braking power). If more braking power is required, the driver is warned by means of a double warning signal (accept signal).

A further audible signal (off signal) signals if the vehicle speed leaves the range of approx. 40 km/h up to 160 km/h.

The driver is able to influence the distance to the vehicle ahead with the distance potentiometer (S46/8r1). The setting range equals about 1 to 2 s the time distance to the vehicle ahead.

If the Distronic is switched off, the calculation of the distance continues to remain active. The display in the instrument cluster and the warning signal inform the driver if the distance in insufficient. The audible and visual distance warning function can be switched on with the distance warning function switch (S46/8s1).

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On AMG models the Distronic is switched off at a speed of more than 260 km/h and a brief warning signal sounds. Consequently, no warning is given if the distance drops below the specified distance. The Distronic cannot be activated again until vehicle speed is less than 260 km/h.

The variable speed limiter (VSL) is integrated in the Distronic system. It is possible to switch between the functions by pressing the variable cruise control switch.

The variable speed limiter is enlarged as follows:

 Range of use from 10 km/h up to maximum vehicle speed

Further technical data of Distronic:

 Distance measuring range of radar: 0 to 150 m

 Number of radar beams: 3

 relative vehicle speed measuring range for vehicles ahead: -50 up to +200 km/h