Method and apparatus for controlling hydraulically-operated power transmitting system including continuously variable transmission

Patent · Tue Jul 28 04:00:00 EDT 1987

OSTI ID:6395639

Takada, M; Itoh, H; Hiramatsu, S; Tamura, T

A method is described of controlling a hydraulically-operated power transmitting system for an automotive vehicle, the power transmitting system including a continuously variable transmission and an auxiliary transmission coupled to the continuously variable transmission, the auxiliary transmission having speed-range positions. The method comprises the steps of: controlling a speed ratio of the continuously variable transmission and selectively placing the auxiliary transmission in one of speed-range positions, according to varying parameters of the vehicle; detecting simultaneous operations of the continuously variable transmission and the auxiliary transmission, which consist of a shift down action of the auxiliary transmission during a shift-down operation of the continuously variable transmission. A shift-up action of the auxiliary transmission occurs during a shift-up operation of the continuously variable transmission; and upon detection of the simultaneous operations, restrains a change in the speed ratio of the continuously variable transmission while the auxiliary transmission is in the shift-down action or the shift-up action.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Aichi
• Patent Number(s): US 4682518
• OSTI ID: 6395639
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
AUXILIARY SYSTEMS
CONTROL EQUIPMENT
CONTROL SYSTEMS
EQUIPMENT
HYDRAULIC CONTROL DEVICES
MACHINE PARTS
MECHANICAL TRANSMISSIONS
SPEED REGULATORS
VEHICLES
VELOCITY