Patent ID: 6311113
Filing Date: 2001-10-30
Classification: F16H

Abstract:
Method for ratio control for a continuously variable belt drive transmission with electrohydraulic control by means of a control loop having a linear PID controller with the theoretical ratio of the variator (ivtheor.) as command variable, the actual ratio iv as control variable and the ratio-change speed as correcting variable wherein the correcting variable delivered by the PID controller is limited to limit values subject to the design for an upshift and a downshift, characterized in that a correction member is used which, taking into consideration internal and external system variables, corrects the generated pattern error with the aid of a physicomathematical pattern wherein to the equation based on the physicomathematical pattern ##EQU8##a correction term ##EQU9##is added and as standard for the ratio gradients the following equation is used: ##EQU10##