Patent ID: 7131931

Claim:
A gearbox control system ( 8 ) for detecting one of a systematic error and a long-term change; wherein during each gearshift operation, under actual driving conditions, at least one of an input torque behavior and an input speed behavior and at least one of an output speed behavior and an output torque behavior of an actual gearbox ( 1 ) is compared to at least one of a predetermined fixed input torque behavior and a predetermined fixed input speed behavior and at least one of a predetermined fixed output speed behavior and a predetermined fixed output torque behavior of a predetermined fixed ideal reference gearbox model ( 7 ) analytically determined from an original design of the gearbox and stored in the gearbox control system ( 8 ) and control inputs to the actual gearbox are modified for a subsequent gearshift operation to drive the actual gearbox to have a shifting behavior of the predetermined fixed ideal reference gearbox model ( 7 ).