Drive train operating method for motor vehicle, involves providing automatic transmission with five switching units, in which one of switching units is opened or closed during implementation of two stepping and/or shifting operations

摘要

The method involves providing an automatic transmission (2) with five switching units, where three units are closed and two units are opened for torque- and/or power transmission in forward and/or reverse gears. Three switching units are alternatively opened and closed, during implementation of the one of stepping and/or shifting operations. One of the switching units is controlled during transition from one of the operation to other operation over a minimum or maximum range. The fourth switching unit is closed and/or opened during implementation of two operations.