Control system for a infinitely variable transmission
This patent describes a control system for an infinitely variable transmission for transmitting power of an internal combustion engine to driving wheels of a motor vehicle, the transmission having a drive pulley including a hydraulically shiftable first disc and a first hydraulic cylinder for shifting the first disc, a driven pulley including a hydraulically shiftable second disc and a second hydraulic cylinder for operating the second disc, and a belt engaged with both pulleys, the system including a first hydraulic circuit having an oil pump of the vehicle and for supplying oil to the first and second hydraulic cylinders, and a transmission ratio control valve disposed in the first hydraulic circuit and having a shiftable spool so as to control the oil being supplied to the first hydraulic cylinder of the drive pulley to change the transmission ratio of the transmission, the improvement in the system comprising: a second hydraulic circuit having a pressure regulator valve means communicating with the pump for maintaining pressure of oil supplied by the pump as control oil at a constant value, the second hydraulic circuit for supplying the control oil to the transmission ratio control valve so as to shift the spool; control valve means provided in the second hydraulic circuit for controlling the amount of the control oil supplied to the transmission ratio control valve so as to shift the spool.
- Assignee:
- Fuji Jukogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4784021
- OSTI ID:
- 6448726
- Country of Publication:
- United States
- Language:
- English
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