Patent ID: 6658340
Filing Date: 2003-12-02
Classification: B60W,F16D,Y10T

Abstract:
A method of updating a transmissibility function (Tcl(x)) of a clutch during a final stage of a gear change, in which said clutch is closed to cause an angular speed (&ohgr;m) of a drive shaft to equal an angular speed (&ohgr;l) of a primary shaft of a transmission (5), in which method an actual value of torque (Tcl) transmitted by said clutch is calculated by subtracting a product of a moment of inertia (Jm) of an engine and an angular acceleration (&ohgr;â€²m) of said drive shaft from torque (Tm) generated by said engine said actual value of said torque (Tcl) actually transmitted by said clutch being used to update said transmissibility function (Tcl(x)) of said clutch; andin which an index of a degradation of said transmissibility function (Tcl(x)) is calculated by comparing said actual value of said torque (Tcl) transmitted by said clutch with an equivalent theoretical value of said torque (Tcl) transmitted by said clutch obtained from said transmissibility function (Tcl(x)).