Patent ID: 7789011

Claim:
A method for actuating a shift cylinder ( 1 ) of an electro-pneumatic control unit for a gearbox of a motor vehicle having one of a main gearbox and at least one group gearbox, the method comprising the step of: prior to a corresponding gearshift, prefilling a first side of the shift cylinder ( 1 ), via a first 3/2-way valve ( 2 ), with a pressure below a detent actuating force in order to reduce a gearshift time, and prefilling a second side of the shift cylinder ( 1 ), via a second 3/2-way valve ( 2 ′), with a pressure below a detent actuating force in order to reduce a gearshift time; maintaining a desired prefilling pressure in the shift cylinder ( 1 ), by one of pulsing and pressure holding, via a main cut-off valve ( 3 ) which is connected to the first 3/2-way valve ( 2 ) and the second 3/2-way valve ( 2 ′), and opening one of the first 3/2-way valve ( 2 ) and the second 3/2-way valve ( 2 ′) at the shift cylinder ( 1 ) to complete the gear shift.