Patent ID: 6336890
Filing Date: 2002-01-08
Classification: F16H,Y10T

Abstract:
A method of controlling a progressive change of an overall transmission ratio from an old transmission ratio to a new transmission ratio, in a transmission device comprising a first and a second gear trains which are independently shiftable for determining together an overall ratio of the transmission device, said method comprising:detecting a physical magnitude which is influenced by progressive ratio change in the second gear train, resulting in a progressive variation of said overall transmission ratio in one direction; and during said progressive ratio change in the second gear train controlling an actuator of a first selective coupling means as a function of a detected value of the physical magnitude, as influenced by said progressive ratio change, said actuator being operatively associated with said first gear train to progressively change a transmission ratio in the first gear train in a direction to at least partially counteract said progressive ratio change of said overall transmission ratio.