Control system for an infinitely variable transmission
A system is described for controlling an infinitely variable transmission for transmitting the power of an internal combustion engine through a clutch for driving a motor vehicle. The transmission comprises a drive pulley having a hydraulically shiftable disc and a hydraulic cylinder for shifting the disc, a driven pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc of the driven pulley, and a belt engaged with both pulleys. The system includes a pressure oil circuit having a pump for supplying pressurized oil, and a transmission ratio control valve having a spool for controlling the pressurized oil so as to move the disc of the drive pulley to change the actual transmission ratio of the transmission. The improvement in the system comprises: first means for moving the spool of the transmission ratio control valve; second means responsive to disengagement of the clutch, when speed of the vehicle is below a predetermined speed, for producing a coasting signal; third means responsive to the coasting signal for producing a drive pulley speed set signal; fourth means responsive to the drive pulley speed set signal for producing a shifting signal representing a quantity of shifting the spool of the transmission ratio control valve in upshifting direction, and fifth means responsive to the shifting signal for shifting the spool of the transmission ratio control valve in the upshifting direction via the first means thereby decreasing the drive pulley speed.
- Assignee:
- Fuji Jukogyo Kabushiki Kaisha Tokyo
- Patent Number(s):
- US 4680987
- OSTI ID:
- 6041569
- Resource Relation:
- Patent File Date: Filed date 8 Nov 1985
- Country of Publication:
- United States
- Language:
- English
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System for controlling the pressure of oil in a system for a continuously variable transmission
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Related Subjects
MECHANICAL TRANSMISSIONS
CONTROL SYSTEMS
HYDRAULIC CONTROL DEVICES
VEHICLES
CYLINDERS
INTERNAL COMBUSTION ENGINES
LUBRICATING OILS
PRESSURIZING
PUMPS
SIGNALS
SPEED REGULATORS
VELOCITY
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
HEAT ENGINES
LUBRICANTS
MACHINE PARTS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
330602* - Vehicle Design Factors- Engine-Transmission Matching