The CSC-roof consists of a total of 470 components. One of the parts is a wind deflector located in the front window frame which can also be pulled down in the sun roof mode.


ELECTROHYDRAULICS FOLDS AND UNFOLDS /
The CSC-roof is activated via an electro-hydraulic pump; a total of eight hydraulic cylinders sort out the five roof cover sections

The propulsion of the roof kinematics and locking devices is done using electro-hydraulics via a radial piston pump. It is located - protected by an acoustic capsule - under the luggage compartment cover behind the spare wheel. The necessary pump pressure (160 bar) is provided by an electric motor with a maximum input of 40 ampere and is activated by a central roof control unit. The hydraulic pump and a total of eight hydraulic cylinders (four cylinder pairs) for the opening and closing of the CSC-roof are activated by pushing the roof cover switch in the middle console.

The cylinders are split into four pairs, as two are deployed per vehicle side. The engineers designed the unit in such a way that the separate steps of the opening and closing operation dovetail in a visually harmonious fashion. For this purpose end position absorbers in the area of the main joint hydraulics and of the rear windscreen element are used. The outwards opening / upwards sliding glass sun roof is separately powered by an electric motor integrated into the roof.


Kinematics / The CSC-roof follows the motion of two un-coupled mechanical systems. And it works really well

In kinematics terms the power is transmitted via a mechanism with a total of six joints. With the help of an innovatively designed functional coupling, the amount of propulsion components used and subsequently the system weight could be reduced. Viewed in detail, two un-coupled mechanical systems are mainly responsible for the kinematics transformation of the roof motion. The main kinematics is formed by a six part transmission. Located in the functional level above are the kinematics of the rear roof section together with an eight part transmission. The mechanics on the driver as well as on the passenger side are each activated by one of the hydraulic cylinders. The additional swing motion of the side spars, and with it the front locking device, is achieved by coupling it with the main kinematics. The necessary locking action of the CSC-roof in the rear is controlled in conjunction with the kinematics of the rear roof section.

The passive control of the roof locking device on the A-pillar (via the swing motion lateral roof spars) creates the construction conditions for the short windscreen frame in the typical convertible style. In addition the weight was kept down. The roof mechanics weighs a mere 22 kilograms.


ELECTRONIC CONTROL /
A newly developed control device coordinates the transformation from coupe to convertible and vice versa

The central folding top control unit was developed especially for the Eos. It is located on the left vehicle side under the rear luggage cover. This Electronic Control Unit (ECU) communicates bi-directionally with the vehicle control devices via the Comfort-CAN-bus. The roof-ECU evaluates the signals coming from the different vehicle system areas. All relevant external information flows into the system. The information is provided by the central gateway, the on-board network control unit, the instrument cluster, the doors, the comfort functions, the braking system and the trailer interface, to name but a few. Internally these are joined by the data from the hydraulics pump and the twelve contact free sensors. An interesting piece of information in this context: the roof control device monitors 250 parameters inside the system.


The new VW Eos - Body

The Eos is 1.79 meters wide, 4.41meters long and 1.44 meters high. The wheel base is exactly 2.58 meters. These dimensions affect the dynamics of the Eos: due to the relatively broad width in comparison with the length and height, the Eos sits powerfully on its wheels.

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