Patent ID: 8607657

Claim:
An actuation device for selecting shifting steps for a shift-by-wire-actuated speed change gearbox, the actuation device comprising: an operating lever ( 2 ) with a position sensor ( 5 ) for determining the position of the operating lever ( 2 ); a device for haptic emulation, wherein the haptic emulation device comprises an adjustable electro-rheological or magneto-rheological damping element ( 3 ) which is connected to the operating lever ( 2 ) and joined ( 8 ) to a base ( 10 ) of the actuation device, a spring element ( 4 ), which is disposed within an operative connection (W) between the operating lever ( 2 ), the adjustable damping element ( 3 ) and the joint ( 8 ) of the adjustable damping element ( 3 ) and which has a known spring rate, for determining the operating force (F) applied to the operating lever by way of the position sensor ( 5 ), and wherein the adjustable damping element ( 3 ) is configured based on characteristic control curves exclusively for generating counterforces, whereas a motor-driven actuator ( 6 ) is configured based on the characteristic curves exclusively for actuating movement of the operating lever ( 2 ) to stimulate and emulate the haptic of a mechanical operating lever.