Transmission ratio control system for a continuously variable transmission

Patent · Tue May 23 04:00:00 EDT 1989

OSTI ID:5710096

Miyawaki, M

This patent describes a control system for a continuously variable transmission for transmitting power of an internal combustion engine controlled by an accelerator pedal, the transmission comprising a drive pulley having a hydraulically shiftable first disc and a first hydraulic cylinder for operating the disc, a driven pulley having a hydraulically shiftable second disc and a second hydraulic cylinder for operating the second disc, and a belt engaged with both pulleys, the control system including a first hydraulic circuit having a pump for supplying oil to both of the hydraulic cylinders, a transmission ratio control valve having a spool for controlling the oil supplied to the first hydraulic cylinder of the drive pulley, shifting means for shifting the spool, sensing means for sensing operating conditions of the engine and the transmission, actual transmission ratio producing means responsive to the sensed operating conditions for producing means responsive to the sensed signal representing the actual transmission ratio of the transmission.

• Assignee: Fuji Jukogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4831898
• OSTI ID: 5710096
• Country of Publication: United States
• Language: English

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