Control Module

Fig 1: Identifying Multimedia Module (MMM)

Courtesy of VOLVO CARS CORPORATION

A DVD player is integrated in the multimedia module (MMM). The DVD player is used to read DVDs with road maps. The control module has various user functions such as:

the start menu
navigation
system settings.

The start menu displays all the functions available to the user on the screen.

The multimedia module (MMM) also has an integrated three dimensional piezo-electrical gyro. This supplies information about the movements of the vehicle, such as any turns taken.

Information used from other nodes for navigation are:

the wheel rotation counter from the brake control module (BCM)
the back-up gear position from the transmission control module (TCM) and central electronic module (CEM)
the vehicle speed signal from the central electronic module (CEM).

Information from these control modules is transmitted to the infotainment control module (ICM) which then transmits the information onwards to the multimedia module (MMM).

The map displayed on the screen indicates the position of the car. This position is calculated using information from:

the wheel rotation counter
the vehicle speed signal
the gyro in the multimedia module (MMM)
the back-up gear position
the global positioning system module (GPS)
the map matching function.

Information from the gyro and wheel rotation counter can be used for dead reckoning (i. e. to calculate the position). This happens for example when communication with the GPS satellites is lost such as when traveling through a tunnel.

The multimedia module (MMM) receives traffic information messages (TMC) from the traffic message channel module (TMC) via the MOST network. This information is displayed on the directly connected display screen. TMC (Traffic Message Channel) is a standardized code system for traffic messages giving information about road repairs, traffic queues etc. The Japanese equivalent of TMC is called FM multiplex. There is no corresponding system in the U. S. A.

The navigation function of the multimedia module (MMM) also includes voice guiding which instructs the driver how to reach the set destination.

The user can configure certain functions in the system settings. These functions are:

date and time
user settings, such as password.

The following functions are displayed on the directly connected display screen:

navigation.

The control module transmits all the signals required to control the display screen.

Multimedia module (MMM) uses the Windows CE operating system.