METHOD OF CONTROLLING A GEAR CHANGING IN A DRIVE UNIT

摘要

A drive unit for vehicles, including a motor and a mechanical transmission with a variable transmission ratio, has an input shaft of the mechanical transmission connected to the motor and a driven shaft of the transmission which supplies drive to the vehicle. The mechanical transmission comprises at least two gear ratios which may be selectively engaged by means of an actuator and further comprises a mechanical synchronizer actuated by the actuator in order selectively to engage the gear ratios, the synchronizer being actuated with an actuation force which may vary as a function of the speed of the input shaft and/or of the driven shaft.