Distronic (DTR) - function - GF30.30-P-0002KB: Notes

ENGINES 112, 113, 271, 612 in MODEL 209 as of 1.6.04 with CODE (219) Distronic (DTR)

ENGINES 112, 113, 271, 272, 646, 647, 648 in MODEL 211 as of 1.6.04 with CODE (219) Distronic (DTR)

ENGINES 112, 113, 137, 275, 613, 628 in MODEL 220 as of 1.6.04 with CODE (219) Distronic (DTR)

ENGINES 113, 137, 275 in MODEL 215 as of 1.6.04 with CODE (219) Distronic (DTR)

ENGINES 112, 113, 275 in MODEL 230 as of 1.6.04 with CODE (219) Distronic (DTR)

ENGINES 113, 272 in MODEL 219 with CODE (219) Distronic (DTR)

Fig 1: Identifying Distronic (DTR) Function

Illustrated on model 230

The Distronic (DTR) must maintain the selected speed (cruise control function) and also regulate the distance to the vehicle immediately ahead.

The Distronic is a convenience system and not a safety system. The driver must himself brake when corresponding traffic situations arise.

The following component are required for the Distronic:

DTR control unit (radar sensor and control unit for destination assessment)
Distronic switch block with distance potentiometer and distance warning function switch
Cruise control pushbutton switch variable or cruise control pushbutton switch (switching On and Off, setting speeds)
Instrument cluster (display and warning tone)
Traction systems control unit
ME-SFI control unit or CDI control unit
EGS control unit, add-on control unit control unit or VSG control unit
SBC control unit
Multifunction steering wheel (select Distronic display).

The Distronic uses the engine torque and braking torque interface in the traction systems control unit. Thus there are no conflicts with engine and brake interventions between the Distronic and ESP systems, all requests are first collected in the ESP control unit. The interventions are then executed according to their importance.

Conditions for functioning of the Distronic are:

Engine running
Electronic Stability Program not switched off
Speed is in the controlled range (that is 30 to 180 km/hour, AMG-vehicles 30 to 260 km/hour, up to model year 2004: from 25 to 110 mph, from model year 2005: from 20 to 110 mph)
Parking brake not operated
selector lever position D or AG or drive mode for ASG
for SBC: the function DTR is only released under 60 km/hour if the function Sensotronic Brake Control Stop is disabled
no fault or warning message is being shown in the instrument cluster.

The Distronic switches off if

the driver brakes
selector lever position N is engaged while driving
Switch over takes place in the function VGA (except ) by pressing on the Cruise control press button switch (light emitting diode LIM in Cruise control pushbutton switch)
ESP regulates.

The Distronic recognizes the traffic situation in front of its own vehicle using the radar sensor and the control unit for destination assessment and creates the conditions to be able to react to changing traffic conditions by braking, accelerating and shifting gear. The driver is also warned about an inadequate distance to the next vehicle ahead optically and acoustically.

The Distronic (DTR) regulates and maintains the desired speed for a free lane like a conventional cruise control.

If, however, one's own vehicle gets too close to the vehicle ahead then the speed is reduced by braking, shifting down and reducing the engine torque and the vehicle ahead is followed with an appropriate clearance between them. The distance is dependent on the setting of the DTR distance potentiometer (N72r1).

If the traffic situation allows the speed to be increased since the vehicle immediately ahead accelerated or left the lane, the Distronic (DTR) regulates the speed again to the set speed. Here the acceleration is limited to a maximum of 1 m/second² .

Interventions by the brake system are limited to a maximum deceleration on comfort and safety grounds to about 20% of the maximum possible braking power. Driving situations which require more than a 20% braking power are indicated to the driver optically (red warning lamp in the Instrument cluster) and acoustically using an intermittent tone.

This takeover tone requests to the driver that he observe the traffic situation and takes action himself. The takeover tone is automatically emitted when there is danger and cannot be switched off.

If the speed falls below 30 km/hour, the Distronic switches off. A signal tone sounds and a message appears in the multifunction display for about 5 seconds "DTR OFF".

If the speed increases above 180 km/hour (AMG: 260 km/hour) then the Distronic switches off the distance regulation system The message "DTR passive" appears in the multifunction display. The Distronic regulates again to the last set speed after enabling the accelerator pedal and the distance regulation system is active again.

Illustrated on model 230

Nominal distance for Distronic

The distance potentiometer on the Distronic is used to set the nominal distance to the vehicle immediately ahead. The adjustment range lies between a time interval of 1 to 2 seconds to the vehicle immediately ahead which represents 0.28 to 0,56 times the speedometer reading in meters.

The distance set is indicated in the multifunction display.

Fig 2: Identifying DTR Distance Potentiometer And DTR Switch

Distance warning

The driver can activate a separate distance warning function quite independently of the Distronic using the DTR switch (LED in switch ON, the loudspeaker also appears in the multifunction display). The distance warning warns the driver in the speed range 30 km/hour up to the maximum speed (max. 250 km/hour) about moving or stationary obstacles in his lane. The warning also occurs optically (red warning lamp in the instrument cluster) and acoustically by an intermittent tone. The distance warning is triggered if deceleration of one's own vehicle in excess of 6 m/s 2 is needed to avoid a collision.

The driver is also shown as an additional function if he remains for longer than 300 meters at a distance of less than a 0.9 second time distance

The red warning lamp lights up until an adequate distance is achieved again. There is no acoustic information emitted in this case.

Variable speed limiter (except )

The variable speed limiter is extended as follows in vehicles with Distronic:

the brakes are applied to prevent the vehicle exceeding the set speed.

Illustrated on model 230

Fig 3: Identifying Multifunction Display Functions And DTR Warning And Indicator Lamp

Shows model 211

Fig 4: Identifying Cruise Control Switch Functions - Shows Model 211

Operating the Distronic

Operation takes place using the CC [TPM] switch. The yellow light emitting diode in the CC [TPM] switch must be off; switch between Speedtronic and Distronic by actuating switch position 5 if this not the case. The system is operated with the CC [TPM] switch (S40).

Distronic (DTR) input and output signals		GF30.30-P-0002-02R
DTR control unit - location/task/function		GF30.30-P-3115K
Distronic switch block - location/task/design/function	Distance potentiometer Distance warning function switch	GF30.30-P-3105K