SYSTEME DE TRANSMISSION PERMETTANT D'INFLUER SUR LA SELECTION DE LA VITESSE DE DEMARRAGE LORSQUE ,PAR EXEMPLE , LES CONDITIONS SUR ROUTE REQUIERENT UNE VITESSE DE DEMARRAGE SUPERIEURE A CELLE QUI EST SELECTIONNEE AUTOMATIQUEMENT.

摘要

A vehicle transmission system has a main drive clutch (14) with a clutch-actuator (20, 22, 38), a transmission (12) with a gear-engaging mechanism (25), a driver-operable gear-selector lever (24), and an electronic control means (36) to control the clutch-actuator (20, 22, 38) and the gear-engaging mechanism (25). When the vehicle is started up from a standstill condition, the control means disengages the clutch and automatically shifts the transmission into a predetermined start-up gear. According to the invention, the electronic control means (36) is designed to allow the driver to operate the gear-selector lever (24) to select a higher start-up gear than the predetermined start-up gear that is selected automatically by the electronic control means.