Speed Limit Assist
94
Driving assistance systems
Introduction of the New E-Class, Model Series 212 Sedan
b
Decision module
The decision module processes the following relevant
data:
• The vehicle's surroundings registered by the
multifunction camera
• Speed and yaw rate
• Attributes of the navigation system from the digital
road map (e.g. type of road)
When the data has been evaluated, the multifunction
camera sends a corresponding request to control the
display of the currently detected speed limit to the
instrument cluster.
The Speed Limit Assist must compile this information
into a single result even if the individual references to
the speed limit contradict each other.
If a control unit or one of the data sources (image
recognition, vehicle data or navigation data) fails, the
Speed Limit Assist is temporarily unavailable.
Function sequence of display concept
The display concept can be selected via the instru-
ment cluster. A distinction is made between notifica-
tion mode and display mode:
Notification mode
In notification mode the detected speed limit is
displayed in the form of a road sign for 5 s. The notifi-
cation can be canceled within the display time. Notifi-
cation mode can be switched on and off by the driver.
The status is indicated by a symbol in the instrument
cluster.
Display mode
In display mode the detected speed limit is displayed
continuously in the instrument cluster until one of the
following events occurs:
• A new speed limit is detected
• A derestriction sign is detected
• No relevant traffic sign is detected inside a driving
distance that varies according to the type of road
• The vehicle passes the boundaries of a recognized
built-up area
• The system detects that the vehicle is turning off
the current road
• The type of road changes
P54.32-7148-00
Representation in multifunction display (example)
1 Speed Limit Assist is available and notification mode is
activated
2 Detected speed limit
3 Unit for the displayed road sign
– This printout will not be recorded by the update service. Status: 01 / 2009 –