Basic position finding, function - GF82.61-P-3006A
MODEL 140, 210.0 up to 31.12.97 with CODE (351) Auto-pilot system (APS)
MODEL 210, 140.03 /05 /07with CODE (350a) Communication navigation system (CNS)with CODE (498) Japanese version
General
Basic position finding (dead reckoning) is accomplished continuously by the navigation processor when the ignition is switched on. After switching off the ignition the current position is stored in the non-volatile memory. The current location is calculated by the navigation processor using
- the distance traveled,
- the direction of motion (forward, backward) and
- the direction in which the vehicle is facing.
Position finding by dead reckoning is accomplished approx. once per second.
Distance traveled
The navigation processor receives the signals from the axle VSS sensors (L6/1 and L6/2) via the traction system control module (N47) . The distance traveled is calculated by evaluating the signals from the VSS sensors.
The difference between the calculated and actual distance traveled between two turning points is used to automatically recalibrate the tire circumference (required due to tire wear).
Direction of motion
The navigation processor determines the direction of motion (forward, backward) from the reverse gear signal (reverse lamp switch).
Direction in which vehicle is facing
The navigation processor calculates the direction in which the vehicle is facing from the speed difference between the VSS sensors (L6/1 and L6/2) and the data from the electronic compass (B26) .
After changing tires wheel recalibration is necessary.
Positioning error
Rolling backwards without the transmission shifted into reverse gear is evaluated as driving forwards and can lead to incorrect positioning. Rolling with the ignition switched off or transport of the vehicle also leads to incorrect positioning. The calculated position is corrected automatically by the navigation processor using data received by the global positioning system (GPS) control module.
| Wheel recalibration, function | CODE 351 APS | GF82.61-P-3001A | |
| Electronic compass, function | CODE 351 APS | GF82.61-P-4101A | |
| Correction of signals from electronic compass, function | Model 210 with CODE 351 APS | GF82.61-P-4002A | |
| Model 140 with CODE 351 APS | GF82.61-P-4002B | ||
| VSS sensor, function | GF42.45-P-4550A | ||
| Auto-pilot system navigation processor, function | Model 210 with CODE 351 APS Model 140 with CODE 351 APS |
GF82.61-P-4104A | |
| CODE 350a CNS | GF82.85-P-3103A |