Patent ID: 6634971
Filing Date: 2003-10-21
Classification: B62M,F16H,G01D

Abstract:
A process for controlling gear shifting in the transmission of a cycle comprising at least one gear sprocket which engages a transmission element and performs transmission of motion when advanced in pre-determined direction; the gear shift being carried out by changing the position of engagement of said transmission element with respect to said at least one gear sprocket, wherein said at least one gear sprocket has at least one given angular position in which shifting of said element for transmitting motion is facilitated, the process comprising the operations of:detecting the movement and the corresponding direction of movement of said element for transmitting motion; controlling change of position of said element for transmitting motion with respect to said at least one gear sprocket when said element for transmitting motion is moving in said pre-determined direction, detecting the angular position of said at least one gear sprocket; preventing change of position of said element for transmitting motion with respect to said at least one gear sprocket when the latter is not in an angular position corresponding to said at least one given angular position, and then allowing change of position of said element when said at least one gear sprocket is forwardly rotated to the next angular position corresponding to said at least one given angular position; providing sensor means for detecting at least one of the angular position of said at least one gear sprocket and the movement and the corresponding direction of movement of said element; and selectively activating said sensor means according to a command request for changing the position of said element for transmitting motion with respect to said at least one gear sprocket.