Shift control for automated discrete vehicle gearbox involves reducing input torque, disengaging old gear on reaching null input torque, synchronizing new gear with engine brake, engaging new gear

摘要

The gearbox (3) is coupled via a clutch (22) that can be disengaged to an engine (2) with a controllable mechanical engine brake (33). The method involves keeping the clutch engaged during a shift from an old gear to a new gear, reducing the gearbox input torque, disengaging the old gear on reaching a null input torque, synchronizing the new gear using the mechanical engine brake, engaging the new gear on reaching the synchronous revolution rate.