Patent ID: 8565986

Claim:
A method for maintaining the capability to shift gears of an automated transmission for a motor vehicle, in case of a failure of an engine speed sensor or a bus connection between a first control module, which controls an engine being connectable to the transmission by means of at least one separation clutch, and a second control module, which controls the at least one separation clutch for connecting the engine to the transmission in a force-transmitting manner, wherein gear-shift relevant data is exchanged between the control modules over the bus connection, the method comprising the steps: checking whether a number of revolutions of an engine shaft, which is detected by a sensor of one of the control modules dedicated to this purpose can be transmitted from the one of the control modules over the bus connection to the other one of the control modules; and performing the following steps, if the number of revolutions cannot be transmitted: opening all synchronizer devices assigned to the transmission or one of the partial transmissions so that the engine shaft can no longer transmit force via a transmission shaft to at least one driving wheel of the motor vehicle; closing the separation clutch assigned to the transmission or the partial transmission comprising the opened synchronizer devices, if this separation clutch is not closed; detecting a number of revolutions of another shaft which can be connected to the engine shaft through the separation clutch by means of an other sensor of the other control module, wherein the other sensor is dedicated to this purpose; and determining a gear-shift ramp function for one of the control modules based on the detected number of revolutions for allowing performance of a shifting process from a source gear to a target gear.