Position finding and destination-oriented navigation, function - GF82.61-P-2010G
MODEL 463.247 /248 /254 /270 /303 /340 /341 up to 31.8.08 with CODE (ET4) COMAND operating and display system as of model year 2007 model year 07.5, YoM 07
MODEL 463.249 /271 up to 31.8.08 as of model year 2007
Shown with code (E66) Sound system (Harman/Kardon)
Global positioning system, function requirements (GPS) position finding
- C. 30 ON
- The Cockpit Management and Data System (COMAND) is authorized and working correctly.
- No error in GPS antenna system
- Signals available from at least three GPS satellites
- Perfect communication with ESP control unit
General
GPS is available worldwide. The GPS satellites permanently transmit time and position data (longitude and latitude). A new GPS position (after interruption of the satellite reception) can take several minutes (up to t = 20 minutes when the equipment is commissioned).
Since GPS operates in the giga hertz (GHz) range (microwaves) and the signals are weak, reception interference can occur as a result of the following events:
- Atmospheric interference, e.g. inclement weather, water vapor, fog
- Multi-path reception due to signal reflections, e.g. from building walls
- Signal blocking, e.g. in built-over areas and in tunnels, through high-rise buildings or trees
The system is made up of the following component functions:
- Position finding function sequence
- Destination-oriented navigation function sequence
Position finding function sequence
The position finding function consists of the following component functions:
- GPS position finding function sequence
- Basic position finding function sequence
Function sequence for GPS position finding
The GPS signals are received by the GPS receiver integrated in the COMAND operating, display and controller unit directly by the GPS antenna at the front left. The GPS signals are used by the COMAND operating, display and controller unit to calculate the vehicle's position at any given time (receiver). Moreover, the direction of motion is determined with the aid of the sequence of the calculated locations.
Basic position finding function sequence
For basic position finding the COMAND operating, display and controller unit requires signals from the following components:
- RPM sensor for monitoring the wheel speeds and via the ESP control unit to the instrument cluster, for monitoring vehicle speed
- Turn rate sensor integrated in the COMAND operating, display and controller unit for determining the vehicle alignment (direction)
- Electronic selector lever module control unit for monitoring the direction of travel
- Steering angle sensor for monitoring the steering angle
The data of the turn rate sensor integrated into the COMAND operating, display and controller unit are processed within the COMAND operating, display and controller unit.
The steering angle signal is read in by the steering column module and forwarded over the interior CAN to the COMAND operating, display and controller unit.
The electronic ignition switch control unit receives the data on the direction of travel (forwards or backwards) through the drive train CAN from the electronic selector lever module control unit. The electronic ignition switch control unit sends the signals over the interior CAN to the COMAND operating, display and controller unit.
The COMAND operating, display and controller unit uses the distance traveled, the vehicle alignment and the direction of travel to determine the vehicle's current position (longitude and latitude).
The movement or transportation of the vehicle with circuit 15 OFF (ignition switched off) falsifies the basic position finding. In both cases, the deviation is automatically corrected by the navigation processor integrated in the COMAND operating, display and controller unit, provided GPS data are received.
Wheel calibration is necessary following a tire change. To this end entry of the tire size and coding, as to whether new tires (tread depth approx. 5 to 10mm) or used tires (tread depth approx. 3 to 5mm) have been mounted, are required. Entries are made using the diagnostic tester or directly via the COMAND operating, display and controller unit. A special calibration journey is not required.
Destination-oriented navigation function sequence
Route calculation is accomplished using the options set to the best possible extent. If observance of the options is not possible, then the options set are ignored for the sections in question and a message is displayed and signaled audibly.
The set criteria and options can be displayed and changed at any time. After a successful calculation, the route is displayed on the map and this information is then relayed acoustically -"Route calculated".
The destination-oriented navigation consists of the following component functions:
- Destination-oriented navigation function sequence through voice output
- Destination-oriented navigation function sequence through visual display
- Function sequence for dynamic route guidance
(except model 463.249/271)
Function sequence for destination-oriented navigation through voice output
The navigation processor integrated into the COMAND operating, display and controller unit constantly compares the route calculation data against the position finding data and derives measures for the remaining destination-oriented navigation process.
With model 463.249/271 or with model 463.248/270/341 with code (E66) Sound system (Harman/Kardon) the voice output is provided by the COMAND operating, display and controller unit via the sound system amplifier to the speakers. On model 463.248/270/341 without code (E66) Sound system (Harman/Kardon) and model 463.247/254/303/340 voice output is issued by the COMAND operating, display and controller unit via direct lines at the speakers.
Destination-oriented navigation function sequence through visual display
The map display is always controlled by the COMAND operating, display and controller unit. The following display functions are supported:
- Destination-oriented navigation map
- Positioning map
- Route map
- Scrollable map
- Destination entry map
Function sequence for dynamic route guidance (except model 463.249/271)
The current traffic situation is taken into consideration in the dynamic route guidance. The incoming information on the traffic situation can be received by the radio data system/Traffic Message Channel (RDS/TMC) function. Information on the current traffic situation is sent out by a specially equipped broadcasting corporation on an area-related basis.
For this purpose a corresponding station must be tuned in. The traffic data recorder decodes the traffic information and forwards it internally to the navigation processor upon request. The navigation processor makes the decision whether the route should be changed. If necessary, a message that the route should be changed is output via the speakers.
The COMAND operating, display and controller unit receives traffic messages on model 463.247/248/249/270/271/340/341 from the amplifier module 1, window antenna (A2/71) and on model 463.254/303 from the radio and cell phone antenna (A28) via the radio and cell phone antenna splitter (A28/1). Traffic messages are stored in the traffic data recorder in the COMAND operating, display and controller unit and made available to the integrated navigation processor. The voice output for dynamic route guidance is sent over the MOST ring to the COMAND operating, display and controller unit and for vehicles with code (E66) Sound system (Harman/Kardon) to the sound system amplifier. The audio signal reaches the speakers via direct lines.
| Instrument cluster, component description | A1 Model year 07.5, YoM 07 |
GF54.30-P-6000G | |
| GPS antenna, component description | A2/23 | GF82.62-P-4118G | |
| Antenna amplifier module, component description | A2/71 Model 463.247/248/270/340/341 as of model year 2007 model year 07.5, YoM 07 Model 463.249/271 as of model year 2007 |
GF82.62-P-3003G | |
| Radio and telephone antenna component description | A28 Model 463.254/303 |
GF82.62-P-3142G | |
| Antenna splitter component description | A28/1 Model 463.254/303 |
GF82.62-P-3125G | |
| Component description for voice control system (VCS [SBS]) control unit | A35/11 Model 463.247/248/254/270/303/340/341 with code (EL1) LINGUATRONIC voice control system or Model 463.249/271 as of model year 07.5, YoM 07 |
GF82.70-P-4300G | |
| COMAND operating, display and controller unit, component description | A40/3 Model 463.247/254/303/340/341, model 463.248/270 except code (498) Japan version |
GF82.85-P-3134G | |
| Model 463.249/271 | GF82.85-P-3134GA | ||
| Inside rearview mirror unit, component description | A67 | GF68.49-P-2105G | |
| Speaker system, component description | H4/1, H4/2, H4/5, H4/6, H4/7, H4/8, H4/27, H4/33 and H4/34; H4/29 (model 463.249/271 or model 463.248/270/341 with code (E66) Sound system (Harman/Kardon)) |
GF82.62-P-4220G | |
| Wheel RPM sensor, component description | L6/1, L6/2, L6/3, L6/4 | GF42.45-P-5134G | |
| Sound amplifier, component description | N40/9 Model 463.248/270/341 with code (E66) Sound system (Harman/Kardon) or Model 463.249/271 |
GF82.62-P-3009G | |
| Steering angle sensor, component description | N49 | GF42.45-P-5107G | |
| Electronic ignition/starter switch control unit (EIS), component description | N73 | GF80.57-P-6000G | |
| Steering column tube module, component description | N80 | GF54.21-P-6050G | |
| LIN converter, component description | N135 | GF82.90-P-4023G | |
| Voice control system (VCS [SBS]) switch, component description | S93/2 Model 463.247/248/254/270/303/340/341 with code (EL1) LINGUATRONIC voice control system or Model 463.249/271 as of model year 07.5, YoM 07 |
GF82.70-P-4301G | |
| Multifunction steering wheel button group, component description | S110, S111 | GF82.90-P-4001G |