Method and apparatus for controlling power transmitting system for automotive vehicle, including continuously variable transmission and auxiliary transmission

Patent · Tue Dec 27 04:00:00 EST 1988

OSTI ID:6410945

Morisawa, K; Kakamu, M; Kato, N

A method is described for controlling a power transmitting system for an automotive vehicle, comprising the steps of: preparing relationships of at least two variables which include a target speed of the input shaft of the continuously variable transmission, and a currently required output of the engine, the relationships corresponding to at least two forward drive positions of the auxiliary transmission, and being determined so that when the auxiliary transmission is shifted down from one of at least two forward drive positions to another of at least two forward drive positions an actual speed of the engine does not exceed a predetermined maximum permissible speed after the auxiliary transmission is placed in another of at least two forward drive positions; detecting currently selected one of at least two forward drive positions of the auxiliary transmission; selecting one of the relationship which corresponds to the detected currently selected forward drive position of the auxiliary transmission; determining the target speed of the input shaft of the continuously variable transmission, according to the selected one of the relationships; and controlling a speed ratio of the continuously variable transmission so that an actual speed of the input shaft coincides with the determined target speed.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Aichi
• Patent Number(s): US 4793217
• OSTI ID: 6410945
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
AUTOMOBILES
CONTROL SYSTEMS
MACHINE PARTS
MECHANICAL TRANSMISSIONS
METERING
OPERATION
SHAFTS
VEHICLES
VELOCITY