文档介绍：Fig. 1. Engine torque during the different phases in automatic gear shifting by engine control. The engine torque is controlled toa state where the transmission transfers zero torque, whereafter neutral gear is engaged without using the clutch. After the speed synchronization phase the new gear is engaged, and control is transferred back to the driver. Abstract — By using engine control during the gear shift, a manual transmission can be automated without using the clutch during the shift event. It is then important to minimize the total time needed for a gear shift, but when doing so driveline resonances may be excited. This in turn may lead to problems with disengaging the old gear and synchronizing speeds for engaging the new gear. Internal driveline torque control isa novel idea for handling resonances and increasing shift quality. By estimating the transmitted torque and controlling it to zero by engine control, the gear can systematically be disengaged with minimized driver disturbances and faster speed synchronizat