Apparatus for controlling continuous variable transmission

Details Apparatus for controlling continuous variable transmission Apparatus for controlling continuous variable transmission

1991-06-12

1992-05-19

Bui, Thuy M.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Load responsive

74866, F16H 6300

Patent

active

051143836

ABSTRACT:
An apparatus for controlling a continuously variable vehicle transmission includes a fixed pulley member and a movable pulley member which is supported for movement toward and away from the fixed pulley member. A groove defined between the pulley members has a width which is decreased and increased to thereby respectively increase and decrease the rotational radius of a belt which is received in the groove. A control arrangement executes speed change control to change the belt ratio. The control arrangement includes a control unit which receives throttle opening degree and vehicle velocity detection signals and determines first and second target engine rotational speed which are based respectively on these detection signals. The control unit determines an optimum target engine rotational speed based on the firt and second target engine rotational speeds and sets upper and lower limit values of the optimum target engine rotational speed in accordance with predetermined conditions. The control unit processes the optimum target engine rotational speed to obtain a final target engine rotational speed which is used to control the transmission.

REFERENCES:
patent: 4653006 (1987-03-01), Osanai et al.
patent: 4658360 (1987-04-01), Osanai et al.
patent: 4764155 (1988-08-01), Kumura et al.
patent: 4853858 (1989-08-01), Kumura
patent: 4926716 (1990-05-01), Hirano et al.
patent: 5025686 (1991-06-01), Sato et al.

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