Patent ID: 6821226
Filing Date: 2004-11-23
Classification: F16H

Abstract:
A method for shift sequence control of a continuous automatic transmission of a motor vehicle, the transmission having gear-stage switchover with the transmission ratio of the automatic transmission being continuously adjustable within an adjusted gear stage via a hydrostatic adjusting unit and a coordinated, data-dependent control of the gear-stage switchover and of the continuous transmission ratio adjustment takes place via a common shift sequence control system, the method comprising the steps of:adjusting said hydrostatic adjusting unit utilizing a step motor operatively connected to said common shift sequence control; detecting values for the speed of said hydrostatic adjusting unit in dependence upon the position of said step motor; in advance of said motor vehicle starting to travel away from standstill, initializing said hydrostatic adjusting unit by adjusting said step motor and, from said values, determining a specific operating position (P2) of said hydrostatic adjusting unit starting from which operating position (P2) a forward travel of said motor vehicle is possible; and, at the end of the initialization, adjusting said step motor so that said hydrostatic adjusting unit is in said specific operating position (P2) so as to avoid an unwanted rearward travel of said motor vehicle after the starting-to-travel of said motor vehicle.