Patent ID: 6424901
Filing Date: 2002-07-23
Classification: F16H,G05B,Y10T

Abstract:
A method of calculating an adjustment speed of a variator of a continuously variable belt-drive transmission in which the transmission comprises at least one operating point and at least one state of operation, at least one clutch having at least one hydraulic flow path, a lubrication means having hydraulic flow paths, a lubrication means having hydraulic flow paths, said variator including at least one hydraulic flow path, and a control unit having a leakage flow path, and wherein said adjustment speed comprises an adjustment gradient, comprising the steps of:for each said state of operation of said transmission, continuously calculating via a physical-mathematical pattern an actual value for a maximum adjustment gradient, said pattern comprising a model combining the at least one hydraulic flow path of the clutch, the hydraulic flow paths of the lubrication means, the at least one hydraulic flow path of the variator and the leakage path of the control unit, including the steps of: modeling each of the said hydraulic flow paths as a laminar insert, and modeling said leakage flow path as an element coupling a laminar hydraulic transmission insert and a turbulent hydraulic transmission insert.