Patent ID: 8255131
Filing Date: 2012-08-28
Classification: F16H

Abstract:
1. A method for monitoring a gear-change operation in a motor vehicle provided with an engine whose crank-shaft is connected to a transmission having a gearbox comprising first and second primary shafts connectable to the crankshaft of the engine by respective friction clutches controlled by corresponding actuators, and a secondary or output shaft connectable to the primary shafts by gears defining a plurality of velocity ratios or gears; the method comprising: detecting a disengagement of a previously engaged gear; verifying the detection by detecting an angular velocity of the primary shaft corresponding to the gear to be disengaged; and by comparing, by a controller, the detected value of said angular velocity with at least one reference angular velocity; wherein the at least one reference angular velocity is calculated based on at least one of an angular velocity of the secondary shaft and an angular velocity of the crankshaft; wherein the angular velocity of the primary shaft corresponding to the gear to be disengaged is compared with the reference velocity that corresponds to the angular velocity of the secondary shaft multiplied by a transmission ratio of said primary shaft to the secondary shaft, corresponding to the gear to be disengaged; wherein the disengagement of said gear is confirmed when the difference between the velocity of said primary shaft and said reference velocity has an absolute value greater than a predetermined value.