Control system for an infinitely variable transmission

Patent · Tue Sep 23 04:00:00 EDT 1986

OSTI ID:5041803

Ide, T; Okamura, M

An improved control system is described for an infinitely variable transmission for a vehicle powered by an internal combustion engine. The transmission has a shift lever for selecting operating ranges including a D/L range, and infinitely variable power transmitting device, a hydraulic circuit for operating the power transmission device and first detecting means for producing a first signal dependent on engine speed. A transmission ratio control valve is provided in the hydraulic circuit and has a spool responsive to the first signal for controlling transmission ratio of the power transmitting device. The improvement comprises: first means for forcibly shifting the spool of the transmission ratio control valve in the downshift direction; second detecting means responsive to operation of an accelerator pedal of the vehicle for producing a second signal; a D/L range switch for producing a third signal when the range is selected by the shift lever; seconds means responsive to the second and third signal for operating the first means, the second means being arranged to operate the first means to move the spool in the downshift direction in response to the second signal at the depression of the accelerator pedal.

• Assignee: Fuji Jukogyo Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4612828
• OSTI ID: 5041803
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100 -- Internal Combustion Engines
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL EQUIPMENT
CONTROL SYSTEMS
ELECTRICAL EQUIPMENT
ENGINES
EQUIPMENT
FLOW REGULATORS
HEAT ENGINES
HYDRAULIC CONTROL DEVICES
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MECHANICAL TRANSMISSIONS
SIGNALS
SPEED REGULATORS
SWITCHES
VALVES
VEHICLES