System for controlling the pressure of oil in a system for a continuously variable transmission
A control system for a continuously variable transmission for transmitting the power of an internal combustion engine to driving wheels through a clutch, having a drive pulley having a hydraulically shiftable disc and a first hydraulic cylinder for shifting the disc, a driven pulley having a hydraulically shiftable disc and a second hydraulic cylinder for operating the disc, a belt engaged with both pulleys, a line pressure control valve having ports and a spool, a transmission ratio control valve having ports and a spool, a first hydraulic circuit having a pump for supplying oil to the first cylinder through the line pressure control valve and transmission ratio control valve, the system comprising: a second hydraulic circuit for supplying oil to the line pressure control valve so as to shift the spool; control valve means provided in the second hydraulic circuit for controlling amount of oil supplied to the line pressure control valve; first means for detecting a large transmission ratio state after disengagement of the clutch and for producing a signal; second means responsive to the signal from the first means for producing a line pressure reducing signal; third means responsive to the line pressure reducing signal for operating the control valve means, so that the spool of the line pressure control valve is shifted to reduce the line pressure.
- Assignee:
- Fuji Jukogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4674363
- OSTI ID:
- 6297744
- Country of Publication:
- United States
- Language:
- English
Similar Records
System for controlling line pressure of a continuously variable transmission for a motor vehicle
Transmission ratio control system for a continuously variable transmission
Related Subjects
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
CYLINDERS
EQUIPMENT
FLOW REGULATORS
HYDRAULIC CONTROL DEVICES
LUBRICANTS
LUBRICATING OILS
MACHINE PARTS
MECHANICAL TRANSMISSIONS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PRESSURE CONTROL
PRESSURE REGULATORS
SIGNALS
VALVES
VEHICLES
WHEELS