Volkswagen DSG – 7 Speed Mechatronic Control Unit

The mechatronic components represent the ‘brain’ of the 7 gear dual-clutch gearbox DSG. They can implement complex shift operations in a fraction of a second. They consist of a control device and control valve assembly together with individual sensors and actuators. If a shift is to be performed, the control device communicates the gearbox data to the vehicle electronics network. Conversely, information is transmitted via this interface from the vehicle and motor to the gearbox computer.

Closed system

The mechatronics module is an autonomous unit with its own oil circulation system. The advantages are obvious: 

• The viscosity of the hydraulic fluid can be adjusted specifically to suit these operating conditions.
• The high degree of purity of the hydraulic oil permits the use of so-called cartridge valves with extremely small clearances. The result: significantly lower leakage rates and therefore efficient operation of an electrically driven pump.
• The mechatronic components can be installed independently of the gearbox and they can be exhaustively tested in advance.
• The system is ‘hybrid-friendly’, because the dual-clutch can be engaged and the gears can be changed even when the internal combustion motor is not running.