Transmission ratio control system for a continuously variable transmission
Patent
·
OSTI ID:5584519
This patent describes a control system for a continuously variable transmission for transmitting the power of an internal combustion engine to driving wheels of a motor vehicle through a clutch, having a drive pulley including a hydraulically shiftable disc and a first hydraulic cylinder for shifting the disc. A driven pulley includes a hydraulically shiftable disc and a second hydraulic cylinder for operating the disc of the driven pulley. A belt is engaged with both pulleys. A transmission ratio control valve has ports and a spool and a line pressure control valve has ports and a spool. A first hydraulic circuit has a pump for supplying oil to the first and second cylinders through the line pressure control valve which controls line pressure and the transmission ratio control valve. The system comprises: detecting means for detecting load on the engine and for producing a load signal; first means responsive to the load signal for producing a desired line pressure signal; second means responsive to the desired line pressure signal for shifting the spool of the line pressure control valve so as to provide control the line pressure; detecting means for detecting a stop of the vehicle and producing a stop signal; third means responsive to the stop signal for increasing the line pressure so as to operate the second hydraulic cylinder to increase the transmission ratio.
- Assignee:
- Fuji Jukogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4708031
- OSTI ID:
- 5584519
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
DESIGN
ENGINES
EQUIPMENT
FLOW REGULATORS
HEAT ENGINES
HYDRAULIC EQUIPMENT
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MATERIALS HANDLING EQUIPMENT
MECHANICAL TRANSMISSIONS
OPERATION
PRESSURE CONTROL
VALVES
WHEELS
WINCHES
330100* -- Internal Combustion Engines
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
DESIGN
ENGINES
EQUIPMENT
FLOW REGULATORS
HEAT ENGINES
HYDRAULIC EQUIPMENT
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MATERIALS HANDLING EQUIPMENT
MECHANICAL TRANSMISSIONS
OPERATION
PRESSURE CONTROL
VALVES
WHEELS
WINCHES