Lyon & Lyon
Control system for belt-type continuously variable transmission
 A belt-type continuously variable transmission has a drive pulley coupled to an input shaft, a driven pulley coupled to an output shaft, a V-belt trained around the drive and driven pulleys, a drive-pulley cylinder for varying the pulley width of the drive pulley, and a driven-pulley cylinder for varying the pulley width of the driven pulley. The belt-type continuously variable transmission is controlled by a control system including a high-pressure regulator valve for producing high-pressure control oil under a high control pressure, a low-pressure regulator valve for producing low-pressure control oil under a low control pressure which is lower than the high control pressure, a shift valve for selectively supplying the high-pressure control oil and the low-pressure control oil to the drive-pulley cylinder and the driven-pulley cylinder, and a shift controller for controlling the shift valve to move in a direction to eliminate an difference between a target speed ratio control value and a present speed ratio control value from a reference position in which an axial thrust force ratio between an axial thrust force required to be applied by the drive-pulley cylinder and an axial thrust force required to be applied by the driven-pulley cylinder to keep a present speed ratio i constant. 
Honda Giken Kogyo Kabushiki Kaisha
F F
F16H F16H
inventional inventional
Takemasa Toru Hideo Shigeru
Kurokawa Fujii Koyama Kanehara