Method for controlling a continuously variable transmission

Patent · Mon Jan 19 23:00:00 EST 1987

OSTI ID:6986946

Itoh, H; Takada, M

A method is described for controlling variable transmission for motor vehicles, having an input shaft for connecting an engine to a continuously variable transmission, and a driving pulley mounted on the input shaft, the driving pulley including a non-movable member and a movable member. The movable member is actuated by an hydraulic cylinder to form a V-shaped opening between the non-movable and the movable member, an output shaft, a driven pulley mounted on the output shaft, the driven pulley including another non-movable member and another movable member. Another movable member is similarly actuated by another hydraulic cylinder to form another V-shaped opening between another non-movable member and another movable member, a flexible belt member spanning the pulleys, and a memory means. The method comprises: storing data representative of a plurality of discrete relationships between openings of a throttle valve and optimum numbers of revolutions per minute of the input shaft in the memory means. Each of the relationships correspond to an actual vehicle speed; detecting an actual opening of the throttle valve which is proportional to an amount of fuel injected into an engine; detecting an actual number of revolutions per minute of the input shaft; and detecting an actual vehicle speed.

• Assignee: Toyota Jidosha Kabushiki Kaisha
• Patent Number(s): US 4637279
• OSTI ID: 6986946
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
COMPUTERIZED CONTROL SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
CYLINDERS
ENGINES
EQUIPMENT
FLUIDS
HYDRAULIC CONTROL DEVICES
HYDRAULIC FLUIDS
MACHINE PARTS
MECHANICAL TRANSMISSIONS
MEMORY DEVICES
MOTION
ROTATION
SHAFTS
VEHICLES
VELOCITY
WORKING FLUIDS