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E93 Complete Vehicle Workbook
Roof Panel Cylinders
The movement of the roof panels is carried out using two roof panel cylinders. The actuation direction of the roof panel cylinders depends
on the rotation direction of the hydraulic pump. When the pistons have retracted into the roof, the hardtop is closed. When the roof panel
cylinders are pressurized on the piston side, the pistons are extended and move the roof panels above each other via the roof panel
control arms. Two Hall sensors are installed on the right roof panel cylinder and detect the position of the piston.
When the roof panel cylinders are pressurized on the rod side, the pistons are retracted and the roof shells separate. When the Hall
sensor detects the position of the retracting piston, the pressure in the cylinder is reduced. In addition, the spring on the roof panel
cylinder acts counter to the movement direction.
The reason for this is that the front roof panel moves into the front cowl very slowly, resulting in a harmonious hardtop movement.
The slow movement also minimizes the risk of becoming trapped.
Index Explanation
1
Spring
f
or
mechanically
damping the roof panel movement
2
Roof panel cylinder
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