Toroidal continuous variable transmission

Details Toroidal continuous variable transmission Toroidal continuous variable transmission

1996-04-19

1997-09-09

Herrmann, Allan D.

Friction gear transmission systems or components

Condition responsive ratio change

Electric or magnetic control

476 42, 477 37, 477 43, 477904, B60K 4114, F16H 1538

Patent

active

056650213

ABSTRACT:
The toroidal continuous variable transmission limits the amount of change of the target transmission ratio while at the same time taking advantage of the excellent speed change responsiveness to perform acceleration and deceleration of a vehicle in a way the driver expects. The toroidal continuous variable transmission checks if the difference .DELTA.e between the present target transmission ratio and the previous target transmission ratio, which were calculated based on car speed information, is larger than the predetermined maximum value .DELTA.e.sub.max. When the absolute value of .DELTA.e is greater than the maximum value, a target transmission ratio e.sub.cn limited by the maximum value is determined. For this corrected target transmission ratio, a control signal Ve is calculated according to the map stored beforehand in the controller. According to the control signal Ve, the tilt angles of the power rollers in the toroidal speed change unit are changed. This control procedure reduces the amount of change of the target transmission ratio compared with the one when the uncorrected target transmission ratio is adopted, thereby preventing unstable response of the speed change control.

REFERENCES:
patent: 4107776 (1978-08-01), Beale

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