Method for performing a gearshift, transmission control unit and transmission system

摘要

A method for performing an accelerating downshift in an instantaneous transmission system (88) having first and second gear trains (5,7;7,9) and a control system (90) for controlling operation of the transmission system (88), including automatically reducing the clutch clamp load in a clutch device (86) until there is relative movement between the input and output sides of the clutch device (86), and automatically adjusting the output of a drive source (80) to substantially synchronise it with the new gear train (5;7) to be engaged before engaging the new gear train (5;7) and while the current gear train (7;9) is still engaged.