ENGINES  113, 137, 275 in MODEL 215 as of 1.7.00 up to 31.5.04 with CODE (219a) Distronic (DTR)

P30.30-2008-79

Shows model 220 A1p13 Multifunction display B29 DTR radar sensor E3e4 Left stop lamp F1/1 Right fuse box N3/10 ME-SFI [ME] control unit N10/8 Rear SAM control unit N15/3 ETC control unit N28/1 Trailer recognition control unit N47-5 ESP, SPS and BAS control unit N63/1 DTR control unit

N72/1 Upper control panel control unit N73 DI control unit N80 Steering column module S40/4 CC with variable speed limiter switch ( S40 CC switch) S46/8r1 DTR distance potentiometer S46/8s1 DTR distance warning function switch X11/4 Data link connector

Tasks Maintaining the selected vehicle speed (cruise control function) and also regulating the distance to a vehicle ahead Variable speed limiter (VSL), except controlling driver information in the instrument cluster and warning signal (distance warning).

Design The Distronic consists of the following components: Distronic control unit Distronic radar sensor Distronic switch block with distance potentiometer and distance warning function switch Variable cruise control switch Cruise control switch Displays in instrument cluster and warning signal CAN databus.

Function The cruise control can rarely be used in dense traffic. The driver must either constantly adjust 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 the specified engine speed (through ESP control unit) Braking (ESP control unit) Shifting gears (ETC control unit). The Distronic can be used from a speed of approx. 30 km/h to 180 km/h or 20 to 110 mph (25 to 110 mph). If no vehicle is driving ahead, the Distronic behaves in the same way as the cruise control.

The Distronic is a convenience system and not a safety system. The driver must himself brake when corresponding traffic situations arise. The system has a diagnostic capability. If a vehicle suddenly appears ahead (e.g. as a result of changing lanes), the Distronic attempts to take control. The braking action is, however, limited to approx. 2 meters/s2 (equals approx. 20% of maximum braking power) for safety reasons. If more braking power is required, the driver is warned by means of an intermittent signal (accept signal). A further audible signal (off signal) sounds if the vehicle speed drops below approx. 30 km/hour ( 25 mph). If the speed set with the cruise control lever is exceeded by depressing the accelerator pedal, the distance measurement of the Distronic continues to remain active even above 180 km/hour ( 110 mph). The Distronic again controls the vehicle to the speed last set after the accelerator pedal is released.

The driver is able to influence the distance to the vehicle ahead with the distance potentiometer. The setting range equals about 1 to 2 seconds 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 intermittent signal inform the driver if the distance to the vehicle ahead is extremely close or if there is a major difference in speed to the vehicle ahead. Visual indication (red distance warning lamp in the instrument cluster remains on) is also given if the time distance to the vehicle ahead is less than 0.8 seconds over a time period of more than 3 seconds (except ). on AMG models the Distronic is switched off at a speed of more than 260 km/hour (160 mph) 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/hour.

The variable speed limiter (VSL) is integrated in the Distronic system (except ). It is possible to switch between the functions by pressing the variable cruise control switch (S40/4). The variable speed limiter is extended as follows in vehicles with Distronic: When traveling downhill, the brakes are applied to prevent the vehicle exceeding the set speed. Range of use from 10 km/hour up to the maximum vehicle speed. Further technical data of Distronic: Distance measurement range of the radar: 0 to 150 meters number of radar beams: 3 relative speed measurement range for vehicles ahead: -50 to +200 km/hour.

	Distronic (DTR) input and output signals		GF30.30-P-0002-02K
	Distronic (DTR) display and operating information		GF30.30-P-0002-01KU
	Distronic radar sensor, location/task/design/function		GF30.30-P-3103K
	DTR control unit, location/task/design/function		GF30.30-P-3104K
	Distronic switch block, location/task/design/function	Distance potentiometer Distance warning function switch	GF30.30-P-3105K

GF30.30-P-0002KB

Distronic (DTR) - function

31.1.04

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

		P30.30-2067-76

Illustrated on model 230 A1 Instrument cluster A89 DTR control unit B37 Accelerator pedal sensor N3/10 ME control unit N15/3 ETC [EGS] control unit N15/6 Automated manual transmission control unit

N47 Traction systems control unit N72 Lower control panel control unit N72r1 DTR distance potentiometer N72s9 DTR switch N73 EIS [EZS] control unit N80 Steering column module N93 Central gateway control unit S9/1 Stop lamp switch (4-pin)

S40 CC [TPM] switch S40/4 CC [TPM] switch (except ) S110 Left multifunction steering wheel button group S111 Right multifunction steering wheel button group Y3/8n4 Fully integrated transmission control (VGS) control unit

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 N72r1 DTR distance potentiometer N72s9 DTR switch (distance warning function) 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.
		P30.30-2048-11

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/s² 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 A1 Instrument cluster A1e59 DTR warning and indicator lamp 7 Display light blue: slow moving vehicle ahead recognized 6 Display red: distance to the vehicle immediately ahead too small A1p13 Left multifunction display 1 Status line A1p15 Right multifunction display 2 Own vehicle 3 Distance scale 4 Slower vehicle ahead 5 Selected target distance 8 Acoustic warning function ON/OFF
		P30.30-2037-82

Shows model 211 S40/4 CC [TPM] switch S40/4v1 Yellow LED, variable speed limiter 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).
		P30.30-2052-01

	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