Environment Monitoring, Basic Function - GF54.65-P-1000A
Model all (CAR)
with code 235 (Active Parking Assist with PARKTRONIC)
Model all (CAR)
with code P44 (Parking package)
Model all (CAR)
with code P47 (Parking package with 360-degree camera)
Overview
This document contains the following information:
- General
- Function requirements
- Environment monitoring
- Display with detected obstacle
- Environment monitoring while reversing
- Environment monitoring in forward travel
- Functional restrictions
General
The environment monitoring system scans the area around the vehicle with the aid of distance sensors in the front and rear bumpers.
It can be switched off and on manually. Environment monitoring is switched on automatically at engine start.
Function requirements
- Engine running or drive train operational
- Vehicle speed 0 to 18 km/h or 16 to 0 km/h (calculated from wheel speed)
- Backward movement of vehicle (defined via the wheel rotation direction) (environment monitoring while reversing)
- No trailer detected (vehicles with trailer hitch) (environment monitoring while reversing)
Environment monitoring
Environment monitoring is based on the ultrasound measurement method. The distance sensors transmit ultrasonic waves. The ultrasonic waves reflected by an obstacle are received again by the distance sensors. In principle a distinction is made between two measurements. On the one hand the direct measurement resulting from a direct echo and on the other hand the indirect distance measurement which is achieved by means of a cross echo (see illustration of the principle of the measuring procedure).
Echoes can usually also be received from adjacent distance sensors due to the large distance sensor detection angles; these are known as cross echoes. These occur at the obstacle due to scattered reflection. With the help of the triangulation method, the distance from the vehicle to an obstacle can be calculated from two echo signals. The propagation times of the signals from the direct measurement and from the cross measurement are required for this method. A long signal propagation time therefore corresponds to a large distance, and a short signal propagation time corresponds to a short distance to the obstacle.
Illustration of the principle for measuring procedure
Display with detected obstacle
If the environment monitoring system is not switched on and an obstacle is detected in the vehicle's path, a pop-up window appears in the multimedia display at speeds up to 10 km/h.
Environment monitoring while reversing
During reverse travel the areas in front of and behind the vehicle are monitored. When the speed drops below the limit speed of 10 km/h, the environment monitoring system changes to measuring mode. If objects are detected in front of or behind the vehicle, the driver is warned by the lighting of the warning segments in the multimedia display and by a warning tone.
When the speed exceeds the limit speed of 12 km/h, the environment monitoring system switches back to standby mode.
If a trailer is detected (vehicles with trailer hitch) (electrical connection established between the vehicle and a trailer), the environment monitoring system is deactivated at the rear.
Environment monitoring in forward travel
When driving forwards the area in front of the vehicle is monitored. When the speed drops below the limit speed of 10 km/h, the environment monitoring system changes to measuring mode. If obstacles are detected in front of or behind the vehicle, the driver is warned by the lighting of the warning segments in the multimedia display and by a warning tone.
When the speed exceeds the limit speed of 12 km/h, the environment monitoring system switches back to standby mode.
Functional restrictions
The environment monitoring system does not recognize the following obstacles:
- Obstacles below the detection range, e.g. animals or objects.
- Obstacles above the detection range, e.g. protruding cargo, overhangs or loading ramps of trucks.
| Function schematics | |||
| Monitor surroundings, function schematic | Model 118, 167, 177, 247, 293 with code P44 (Parking package) Model 118, 167, 177, 247, 293 with code P47 (Parking package with 360-degree camera) Model 118, 167, 177, 247 with code 235 (Active Parking Assist with PARKTRONIC) | PE54.65-P-2500-97A | |
| Control units | |||
| Parking system control unit, basic function | GF54.65-P-9890A | ||
| Components | |||
| Distance sensor, basic function | GF54.65-P-2001A |