Part I

Panorama Glass Roof

Panorama glass roof
The panorama glass roof is available as an optional equipment. The expansive glass surface furnishes a positive sensation of spaciousness extending beyond the experience provided by a conventional slide/tilt sunroof.
The panorama glass roof consists of two glass panels. The front panel can be opened or tilted upward.
For the F11 a two-section sliding trim can be used to expose the entire glass surface, allowing generous amounts of light to enter the passenger compartment.
The following diagram shows the design of the panorama glass roof for the F11:







For the F07 a newly developed roller sunblind is used in place of the two-piece sliding trim. The integration of a sliding trim is not possible due to the space requirement. The roller sunblind is opaque and requires less space.
The following diagram shows the design of the panorama glass roof for the F07:







In this functional description no differentiation is made between the drive of the sliding trim and the drive of the roller sunblind. The two identical drive units are described as sliding visor motors, also when the roller sunblind is operated for the F07.
The panorama glass roof is a slide/tilt sunroof with inside rail assemblies. Two drive units control operation of the panorama glass roof's components (front glass panel and two-section sliding trim, i.e. roller sunblind):
1. Drive for front glass panel
2. Sliding visor motor

Two hall effect sensors are incorporated in each of the mutually identical drive units. The hall effect sensors are located on the drive units' shafts at a mutual deviation angle of 90 degrees.
The drive units are operated using a new operating logic, with user command input at the panorama glass roof switch in the roof function centre (FZD). The front glass roof and the two-section sliding trim, i.e. the roller sunblind, can be operated together or separately using the panorama glass roof switch. The direction in which the components move mirrors the direction in which the switch for the panorama glass roof is moved.

The following table shows the characteristics of the different panorama glass panels:







In the comfort position the front glass panel is not fully opened or closed. The front glass panel is operated initially in the comfort position during opening and closing.
When the panorama glass roof is fully closed the noise level in the passenger compartment is comparable to that of a vehicle without a panorama glass roof.
A wind deflector has been provided to ensure that noise levels remain agreeable when the panorama glass roof is completely open. The wind deflector has a positive effect on noise levels in the passenger compartment.
A closing force limited has been provided to prevent potential injuries.
A number of control units participate in controlling the functionality of the panorama glass roof.

The user-control concept employed for the panorama glass roof is as follows:







The following illustration shows the size of the F11 panorama glass roof relative to that of conventional slide/tilt sunroofs.







Brief component description
Descriptions of the following components of the panorama glass roof:
- Roof function centre (FZD)
- Car access system (CAS)
- Footwell module (FRM)
- Switch, panorama glass roof
- Drive units for panorama glass roof.

Roof function centre (FZD)
The panorama glass roof is controlled and its operation is monitored from the roof function centre (FZD). The roof function centre (FZD) receives signals from other control units to support the panorama glass roof's various functions:
- The Car Access System (CAS) supplies the enable signal allowing operation of the panorama glass roof
- The footwell module (FRM) supplies signals from the door contacts
- The Junction Box Electronics (JBE) module provides access to Terminal 30B through the roof function centre (FZD).

The roof function centre (FZD) responds to commands requesting operation of the panorama glass roof by activating the two integral relays. The relays supply the appropriate drive units with voltage.
The roof function centre (FZD) monitors the relay contacts to ensure trouble-free activation (front glass panel and two-section sliding trim, i.e. roller sunblind). Two hall effect sensors are integrated within each of the drive units.
The pulses from the hall effect sensors are employed by the roof function centre (FZD) as the basis for calculating travel speeds and operating paths and identifying the direction of rotation. The travel distance required for opening and closing is stored in the roof function centre. While traversing this travel distance the drive units generate a specific number of pulses. This allows the roof function centre (FZD) to recognize the positions of the front glass panel and the two-section sliding trim, i.e. roller sunblind.

The roof function centre (FZD) calculates closing force based on the closing speed. The required mechanical force varies as a function of ambient temperature and as a result of ageing processes. For this reason the closing force required and the parameters for the closing force limiter are adapted for the closing actions in defined distances. The following functions of the panorama glass roof are integrated in the roof function centre (FZD):
- Read in command request
- Control and monitor drive for front glass panel and sliding visor motor
- Closing force limiter
- Locking protection
- Panic mode
- Load cutoff during starting up (automatic engine start-stop function)
- Locator lighting (terminal 58g) in the slide/tilt sunroof switch
- Initialization.

Car access system (CAS)
The Car Access System (CAS) supplies the enable signal allowing operation of the slide/tilt sunroof. The Car Access System (CAS) transmits the status "Terminal 50 on" via K CAN2. The roof function centre (FZD) prevents activation of the drive units and also suspends any ongoing travel motion while the engine is being started. This increases the amount of voltage available to the starter motor.

Footwell module (FRM)
The footwell module (FRM) provides the Car Access System (CAS) with status information on the door contacts for the release of the panorama glass roof.
This status information is needed for the "convenient opening" and "convenient closing" functions.
The footwell module (FRM) also supplies the roof function centre (FZD) with information on the status "Terminal 58g on". The roof function centre (FZD) controls activation of the light-emitting diode in the switch for the panorama glass roof.

Switch, panorama glass roof
The panorama glass roof switch in the roof function centre (FZD) can be used to open, close and raise the panorama glass roof. Pressing the panorama glass roof's switch initiates transmission of a corresponding signal to the roof function centre (FZD).
The switch for the panorama glass roof is integrated within the roof function centre (FZD) and moves in 3 directions:







When moved to the "open" and "closed" positions the switch for the panorama glass roof can be pushed to either of two detent positions. When the switch is moved into the first detent position the selected motion is executed only for as long as pressure is maintained on the switch for the panorama glass roof. Applying additional pressure to engage the second detent activates the toll function (automatic function). The toll function triggers travel motion that continues even after the pressure on the panorama glass roof switch is released.
In addition to the toll and detent-engagement functions, the switch also features a double-click function for operation in the "open" and "close" directions. The double-click function is activated by quickly pressing the switch into the detent-engagement position twice in rapid succession. Automatic opening or closing of the front glass panel with the two-section sliding trim, i.e. the roller sunblind, can thus be selected from every position. The switch can be pressed again to interrupt any current travel motion being executed by the panorama glass roof.
When the exterior lights is switched on, the footwell module (FRM) transmits this information on K CAN2. The roof function centre (FZD) receives this information and adopts the selected setting for the instrument lighting. The roof function centre (FZD) employs a pulse-width-modulated signal to control activation of the light-emitting diode in the panorama glass roof's switch. This ensures that the brightness level of the light-emitting diode remains constant even when the electrical vehicle voltage fluctuates.







Drive units for panorama glass roof
The drive unit for the front glass panel is installed in the panorama glass roof's frame below the roof function centre (FZD).

The two-section sliding trim, i.e. the roller sunblind, is driven by the separate sliding visor motor. The sliding visor motor is installed on the bottom of the panorama glass roof's frame in the rear roof area.
The panorama glass roof drive units each comprise an electric motor with reduction gear.
The roof function centre (FZD) responds to commands requesting operation of the panorama glass roof by activating the corresponding drive unit. The relay integrated within the roof function centre (FZD) supplies the drive with voltage. There 2 Hall sensors integrated in the drive. The hall effect sensors detect the engine revolutions and the direction of rotation. The hall effect sensor signals are transmitted to the roof function centre (FZD). The hall effect sensor signals allow the roof function centre (FZD) to recognize the position of the panorama glass roof. The roof function centre (FZD) calculates the closing force based on the closing parameters.