Toroidal continuously variable transmission control apparatus

Details Toroidal continuously variable transmission control apparatus Toroidal continuously variable transmission control apparatus

2005-08-16

2005-08-16

Black, Thomas G. (Department: 3663)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

C701S051000, C701S095000, C475S208000, C475S216000, C477S050000, C180S197000

Reexamination Certificate

active

06931316

ABSTRACT:
In a toroidal continuously variable transmission (TCVT) control apparatus with a variator unit and a ratio control hydraulic system, an electronic TCVT control unit electronically feedback-controls a transmission ratio based on a deviation from a desired transmission ratio, and generates a normal-period command signal to be input to a step motor for compensating for the deviation. The control unit determines whether the deviation can be compensated for by electronically feedback-controlling the transmission ratio based on the deviation and generates an abnormal-period command signal to be input to the step motor to realize a step-motor displacement capable of shifting or diverging the transmission ratio to a speed-reduction side, while keeping a trunnion out of contact with a stopper in the direction of the trunnion axis, when the deviation cannot be compensated for by electronically feedback-controlling the transmission ratio based on the deviation.

REFERENCES:
patent: 6312357 (2001-11-01), Sakai et al.
patent: 6383115 (2002-05-01), Kawamura
patent: 6405611 (2002-06-01), DeJonge et al.
patent: 6409625 (2002-06-01), Sakai et al.
patent: 6436001 (2002-08-01), Sakai et al.
patent: 8-93873 (1996-04-01), None
patent: 8-178042 (1996-07-01), None
U.S. Appl. No. 10/436,077, filed May 13, 2003, Joe et al.

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